WO2001094700A1 - Papermaking sludge processing method and processing device and hardened body - Google Patents

Abstract

Papermaking sludge separated from pulp (84) by a water washer (80) is dehydrated by a screw press (92), producing a block-like papermaking sludge (11B). And, water is added to the block-like papermaking sludge (11B) to adjust the consistency and then sheet-making is effected using filtered water. That is, dehydrating the papermaking sludge separated in a paper mill makes it easier to transport the papermaking sludge to a papermaking sludge processing facility provided with filtered water; thus, a hardened body can be produced from papermaking sludge in a commercially profitable manner.

Description

 Description Papermaking sludge treatment method, treatment equipment and cured body

 TECHNICAL FIELD The present invention relates to a method and an apparatus for treating papermaking sludge, which can effectively utilize papermaking sludge generated at the time of recycling used paper. Also, the present invention relates to a cured product obtained by solidifying papermaking sludge into a plate shape.

'冃:

 In recent years, from the viewpoint of global environmental protection, effective use of various industrial wastes has been studied. For example, in the construction industry, which has consumed large amounts of forest resources, it has been proposed to reduce the consumption of forest resources by newly seeking construction materials for industrial waste.

 For example, Japanese Patent Application Laid-Open No. 55-12853 discloses a papermaking sludge made from old newspapers and the like, which is dewatered by wire pressing, dried by a dryer, and finally hot pressed. Also, Japanese Patent Application Laid-Open No. 52-90585 discloses a cured product in which the surface of a cured product of papermaking sludge is paraffin-coated. Further, Japanese Patent Application Laid-Open No. Sho 50-110164 discloses a cured product obtained by mixing papermaking sludge with glass fiber.

 However, none of these technologies has been able to achieve sufficiently high densities, and problems such as dimensional stability and warpage when absorbing moisture remain.

 An object of the present invention is to produce a cured product having a high density at a mass production level, to secure the dimensional stability of the cured product when absorbing moisture, and to prevent warpage.

 Further, the inventor has an idea of using the above-mentioned cured body as a panel-like flooring material. However, the cured product has a relatively heavy specific gravity of 1.2 to 1.3, and the weight required to have a thickness of 2 Oram or more is large in order to obtain the required strength as a floor material. For this reason, it was expected that it would be difficult to handle the floor material when filling it into panels.

The present invention has been made to solve the problems described above, What is needed is to provide a cured product that is easy to handle.

 Further, the cured product obtained by drying the papermaking sludge contains a large amount of moisture, so that its dimensional stability is low. It expands when it absorbs moisture, and shrinks when it becomes less moisture, so its use is limited.

 The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a cured product having excellent dimensional stability and a cured product. Disclosure of the invention

 As a result of careful studies, the inventors found that the density of the cured product was low and the dimensional stability was poor because the fibers of the waste paper were not loosened and the extraction of inorganic components between the fibers was insufficient. I understood. In addition, they found that the fibers could not be loosened sufficiently, so that the fibers could be entangled uniformly. Due to this non-uniformity, the rate of dimensional change during moisture absorption was large, and it was found that warping occurred.

 The invention of claim 1 comprises: (a) a step of cooking paper; (b) a step of separating papermaking sludge from the cooked digest; and (c) a step of drying and hardening the papermaking sludge to obtain a cured product. . Since the paper is digested, the fibers of the waste paper are loosened, and the extraction of the inorganic components between the fibers is sufficient, and a high-density composite cured product is obtained.

 In addition, since the fibers are uniformly entangled, the dimensional change rate during moisture absorption is small, and no warping occurs. Needless to say, this effect can be similarly applied to the inventions of claims 2 and subsequent claims.

 In order to solve the above-mentioned problem, a method for producing a cured product according to claim 2 is characterized by including at least the following steps:

 (a) cooking paper;

 (b) washing the digested pulverized product with water to separate papermaking sludge; (c) papermaking a raw material solution containing papermaking sludge using a filter body, and attaching a papermaking sludge paperwork to the surface of the filter body. And transferring the paper to a conveyor belt.

 (d) a step of curing the papermaking body to obtain a cured papermaking sludge.

In claim 2, papermaking sludge is formed using a filter body, and the papermaking sludge paperwork is adhered to the surface of the filter body, and the papermaking body is transferred to a transport belt. By curing the copied paper, a cured product that can be used as a floor material, a wall material, and the like can be obtained from papermaking sludge. Here, since the paper is continuously formed using the drainage body, a cured product obtained by solidifying the papermaking sludge can be efficiently mass-produced.

 The method for treating paper sludge of claim 3 is characterized by comprising at least the following steps:

 (a) cooking the paper;

 (b) washing the digested cooked product with water to separate papermaking sludge;

(c) dewatering the separated papermaking sludge;

 (d) adjusting the concentration by adding water to the dewatered papermaking sludge;

 (e) papermaking the raw material solution containing the papermaking sludge whose concentration has been adjusted using a filter body, attaching the papermaking sludge paperwork to the surface of the filter body, and transferring the papermaking body to a transport belt;

 (f) a step of curing the papermaking body to obtain a cured papermaking sludge.

 In claim 3, the separated paper sludge is dewatered. Then, water is added to the dewatered papermaking sludge to adjust the concentration, and then papermaking is performed using a filter body. In other words, by dewatering the papermaking sludge separated at the papermaking factory, it is easy to transport it to a papermaking sludge treatment facility equipped with a drainage body, and produce a cured product from the papermaking sludge so that it is commercially viable. can do.

 In claim 4, the solid content is reduced to 5 to 50% by dehydration. If the solids content exceeds 50%, a demolition facility is required to adjust the concentration by adding water in the subsequent process. On the other hand, if it is less than 5%, it becomes liquid and is inconvenient to handle, and the weight increases and the transportation efficiency decreases.

 The technical feature of the paper sludge treatment method according to claim 5 is that it comprises at least the following steps:

 (a) cooking the paper;

 (b) rinsing the digested cooked product with water to separate papermaking sludge;

(c) settling the separated paper sludge;

(d) papermaking the raw material solution containing the precipitated papermaking sludge using a filter body, attaching the papermaking sludge paperwork to the surface of the filter body, and transferring the papermaking body to a conveyor belt; (e) a step of curing the papermaking body to obtain a cured papermaking sludge.

 In claim 5, the cooked paper is washed with water to precipitate the papermaking sludge separated from the pulp, and then the raw material solution containing the precipitated papermaking sludge is formed using a filter body. That is, since the paper sludge separated from the pulp is precipitated and then formed into a paper, it is easy to adjust the concentration for the paper, and a cured product can be produced from the paper sludge so as to be commercially profitable. .

 The method for treating paper sludge according to claim 6 is characterized by comprising at least the following steps:

 (a) a step of digesting the paper; and (b) a step of washing the digested pulverized product with water to separate papermaking sludge; (c) a step of adjusting the concentration of the separated papermaking sludge;

 (d) papermaking the raw material solution containing the papermaking sludge whose concentration has been adjusted using a filter body, attaching the papermaking sludge paperwork to the surface of the filter body, and transferring the papermaking body to a conveyor belt;

 (e) a step of curing the papermaking body to obtain a cured papermaking sludge.

 In claim 6, the digested paper is washed with water, the concentration of the papermaking sludge separated from the pulp is adjusted, and a raw material solution containing the adjusted papermaking sludge is made using a filter, and the papermaking sludge is formed on the surface of the filter. Is adhered. That is, since the papermaking sludge separated from the pulp is made without dehydration and water addition corresponding to the dewatered amount, a cured product can be produced from the papermaking sludge so that it is commercially profitable. '

 According to claim 7, since the solid content is adjusted to 3 to 6% by adjusting the concentration, papermaking sludge separated from pulp can be made without dehydration and water addition corresponding to the dewatered content. A cured product can be produced from papermaking sludge so that it is profitable.

 The technical feature of the papermaking sludge treatment apparatus according to claim 9 is to provide at least the following:

 (a) a digester for cooking paper;

(b) a washing device for washing the cooked pulverized product with water to separate papermaking sludge; (c) making a raw material solution containing papermaking sludge, and forming a papermaking sludge paperwork on the surface. Filter body to be attached;

 (d) a transfer belt for transferring the paper body on the surface of the drainage body;

 (e) a cutting device for cutting the filter body of the transfer belt;

 (f) A curing device for curing the cut filter body.

 In claim 9, papermaking sludge is formed by using a filter body, the papermaking sludge sheet is attached to the surface of the filter body, and the sheet is transferred to a conveyor belt, and the transferred sheet is cured. Thus, a cured product that can be used as a building material such as a floor material and a wall material can be obtained from papermaking sludge. Here, since the paper is continuously formed using the filtrate, it is possible to mass-produce a hardened material obtained by solidifying the papermaking sludge efficiently.

 In order to solve the above-mentioned problem, claim 10 is a cured product comprising an inorganic amorphous material and a fibrous material,

 It is a technical feature that the corner has a chamfered shape.

 Claim 11 is a cured product obtained by curing papermaking sludge, and has a technical feature that a chamfer is provided at a corner.

 In the present invention, since the corners of the cured body are chamfered, when used as a building material such as a panel-like flooring material, it is easy to handle and insert. Also, the corners are not chipped or broken. Furthermore, there is no squeaking noise generated by rubbing of the corners. Furthermore, they found that the sound insulation and vibration damping properties were improved.

 Since the chamfer is provided with the C surface, chamfering is easy.

 Since the chamfer is provided with a round surface, it is easy to handle and insert easily when used as a floor panel.

 The invention according to claim 14 is a composite cured product comprising an inorganic amorphous material composed of oxides of Si, Al, and Ca and an organic fibrous material obtained by curing papermaking sludge. The cured product is characterized in that the ratio is 3% or less.

The equilibrium water content is the water content when the temperature reaches 25 ° C and the humidity reaches 30%, and when the equilibrium state is reached. In the present invention, the organic fiber component in the papermaking sludge is adjusted to 75% by weight or less based on the composite cured product, and the amount of Ca in the inorganic amorphous material is converted into CaO, By adjusting it to 3% by weight or more based on the composite cured product, the hygroscopicity is reduced. Organic fiber (pulp fiber component) easily absorbs moisture, so reducing it reduces Ca component, which impairs moisture absorption. The equilibrium moisture content can be adjusted.

 By adjusting the equilibrium moisture content to 3% or less, it becomes difficult to absorb moisture, and the problem of dimensional change due to expansion and contraction is eliminated.

 As a result, it can be used in places with high humidity, and its use is expanded. Furthermore, since the surface of the cured body is partially exposed and coated, both prevention of water absorption and drying when moisture is absorbed can be achieved, and dimensional change can be suppressed.

 A hardened papermaking sludge, a composite hardened body composed of an inorganic amorphous body composed of oxidized substances of Si, Al, and Ca and an organic fibrous substance,

The cured product has a content of the organic fibrous material of 75% or less and contains an oxide of S in an amount of 0.1% by weight or more in terms of SO ₃ .

Since the amount of organic fibrous materials is small, the amount of water absorbed is small. On the other hand, since SO ₃ has the effect of absorbing only a certain amount of moisture, the equilibrium water content can be more than 3% and less than 6%. By adjusting to less than 6%, the dimensional change rate can be suppressed even in an environment with high humidity.

 This is because if it contains some water, it is difficult to absorb moisture even if the humidity rises. BRIEF DESCRIPTION OF THE FIGURES

 FIG. 1 is a schematic cross-sectional view of the composite cured product of the present invention.

 FIG. 2 is a schematic cross-sectional view of the composite cured product of the present invention.

 FIG. 3 is a conceptual diagram of a paper mill according to the first embodiment of the present invention.

 FIG. 4 is a conceptual diagram of an apparatus for producing a cured body according to the first embodiment of the present invention. FIG. 5 is a conceptual diagram of a raw material adjusting mechanism of the apparatus for producing a cured body shown in FIG. FIG. 6 is a conceptual diagram of a papermaking mechanism of the apparatus for producing a cured body shown in FIG. 7 (A), (B) and (C) are explanatory views of the operation of the cutting rotary drum.

FIGS. 8A, 8B, and 8C are explanatory diagrams of the operation of the inverter. FIG. 9 is an explanatory diagram of the operation of the press machine, (A), (B), and (C). FIGS. 10 (A), (B) and (.C) are explanatory diagrams of the operation of the press machine. The first 1 figure, (A), (B) is a cross-sectional view of a cured product to be used as flooring _c FIG. 12 is a plan view of a cured body used as a floor material.

 FIG. 13 is a conceptual diagram of a paper mill according to a second embodiment of the present invention.

 FIG. 14 is a conceptual diagram of an apparatus for producing a cured body according to a second embodiment of the present invention. FIG. 15 is a conceptual diagram of a raw material adjusting mechanism of the apparatus for producing a cured product shown in FIG.

 FIG. 16 is a conceptual diagram of a paper mill according to a third embodiment of the present invention.

The first 7 figures, C a O / S i 0 2 and compressive strength, Ru graph der showing the relationship between the lightness.

The first 8 figures, C a O / A l ₂ 〇 ₃ and compressive strength, Ru graph der showing the relationship between the lightness.

 FIG. 19 is a graph showing the relationship between the content of CaO and bending strength / compression strength.

 FIG. 20 is a graph showing the relationship between the content of CaO, nail pull-out strength, and fracture toughness.

 FIG. 21 is a graph showing the transmission loss of the cured product.

 FIG. 22 is a graph showing the loss factor of the cured product. BEST MODE FOR CARRYING OUT THE INVENTION

 In a preferred embodiment of the present invention, a composite cured product obtained by curing papermaking sludge has a chamfered corner. Therefore, when used as a building material, it is easy to fit, there is no chipped corner, and there is no squeaking noise generated by rubbing of the corner. Furthermore, surprisingly, it is possible to improve the sound insulation and vibration damping properties. This is presumed to be because the removal of the corners makes the board easier to move, making it easier to absorb sound energy.

First, the structure of a composite cured product produced by the method for producing a composite cured product of the present invention, which will be described later, will be described with reference to the schematic diagram of FIG. The composite cured body 1 includes an inorganic amorphous body 2 composed of two or more types of oxides, and is basically composed of the inorganic amorphous body 2 and an organic fibrous substance 3 mixed therein. . As used herein, the term “inorganic amorphous substance comprising two or more oxides” refers to an oxide (1) monoxide (2) ··· oxide (n) (where ri is a natural number) And oxides (1), oxides (2), Oxidation products (η) are different oxides.

 Although it is difficult to accurately define such an amorphous substance, it is considered to be an amorphous compound formed by a solid solution or hydration reaction of two or more kinds of oxidized products. Can be By X-ray fluorescence spectroscopy, such inorganic amorphous compounds can be analyzed for the elements that make up the oxides (i.e., Si, Ca, Na, Mg, P, S, K, Ti, Mn, Fe, Zn). At least two types selected from the following), and a halo is observed in the range of 20: 10 ° to 40 ° in the analysis chart by X-ray diffraction. This halo is a gradual undulation of the intensity of X-rays, and is observed as a broad swell on the X-ray chart. The halo has a half width of 20: 2 ° or more.

 In the above-mentioned composite cured product 1, the inorganic amorphous material 2 becomes a strength-expressing substance, and the organic fibrous material 3 is dispersed in the inorganic amorphous material 2 to improve the fracture toughness value. Strength value ゃ Impact resistance can be improved. In addition, a homogeneous cured product having no anisotropy in strength can be obtained. Furthermore, since it is an amorphous body, there is an advantage that sufficient strength can be obtained at a low density.

 The reason why the above-mentioned amorphous material becomes a material exhibiting strength is not clear, but is presumed to be because the progress of cracks is inhibited as compared with the crystalline structure. In addition, since the fibrous material is more easily dispersed in the amorphous state than in the crystalline state, the fracture toughness value is considered to be improved. As a result, cracking does not occur even if a nail is driven or a through-hole is provided, making it optimal for materials that require processing, such as building materials.

Here, as the oxide, it can be used an oxide of a metal contact Yopinomatawa nonmetal, A l ₂ 0. _{, S i 0 2, C a} O, Na 2 0, MgO, P 2 0 5, S0 3, K 2 0, T i 0 ", MnO, be selected from F e ₂ 0 ₃ and Zeta eta Omicron desirable Above all, Al ₂ 0 ₃ —S i 0._J & 0 or 1 _{2 3} —S i〇 ₂ —C a〇 —Oxide-based amorphous material, or a composite of these amorphous materials body is optimal. Note that the oxide in the latter amorphous body is one or more of a l ₂ 〇 _3, S I_〇 oxides of metals and Z or nonmetal except ₂ and Ca_〇.

First, in the amorphous body composed of the A 1 ₂ 〇 ₃ — S i 0 ₂ — C a 〇 system, all or a part of each component of A 1 ₂ 〇 ₃ , S i 0 ₂ and C a O is fixed to each other. It is a compound having an amorphous structure formed by dissolution or hydration. That, A 1 ₂ 0 ₃ and S I_〇 _2, 3 10 ₂ binding & 0, A l ₂ 〇 ₃ and C a O, and by A 1 ₂ 〇 _3, S I_〇 solid solution or hydration in combination of _two Contact Yopi C a O, etc. It is thought to contain any of the compounds that form.

 In such an inorganic amorphous compound, A1, Si, and Ca were confirmed by fluorescent X-ray analysis, and the halo was observed in the range of 20: 10 ° to 40 ° in the analysis chart by X-ray diffraction. Can be seen.

_{Further, A 1 2 0 3, S} i 0 2 and C a O at least one Sani匕物pressurized example was the system in addition to, that is _{A l 2 0 3 - S i} 0 2 - C A_〇_ Sani匕non Akirashitsutai consisting -based, in addition to the combination of the above _{a 1 2 0 3 -S i 0} 2 -C A_〇 system, a 1 ₂ 0 ₃ oxide, S i 0 ₂ with the oxide, C A_〇 and Sani匕物, a 1 ₂ 〇 ₃ and S i 0 ₂ with the oxide, S i 0 ₂ and C a O oxide, a 1 ₂ 0 ₃ and C a O oxide, and a 1 It believed to contain any of the ₂ 0 ₃ and S i 0 ₂ and C a O and the acid i dry matter of the resulting reduction Gobutsu by solid solution or hydration, etc. in combination.

Incidentally, the oxide is 2 or more, i.e., if the amorphous body of the A l ₂ 〇 ₃ _S I_〇 ₂ _C AO- oxide (n) based (n is a natural number of 2 or more), these acids I Swords, eg oxide (1), acid (2) ···, oxide (n) (n is a natural number of 2 or more, and oxide (n) is different if the value of n is different means oxide, and is a 1 ₂ 0 _3, S I_〇 _2, C a O is obtained by excluding the) like the solid solution or hydration at least two yarn且combined selected from each compound produced by, a 1 ₂ 0 _3, S I_〇 _2, compound C had in solid solution with at least two combination selected from a O produces by hydration or the like, an oxide (1 ), at least one Sani匕product (2) ... 'oxide (n) (n is selected from each of two or more natural number), the a 1 ₂ 0 _3, S I_〇 _2, C a O Few to be chosen Both is solid solution in combination with one Rere are believed to include either the compound produced by hydration reaction or the like.

 By X-ray fluorescence spectroscopy, such inorganic amorphous compounds can be analyzed in addition to A 1, S i, and C a, as well as the elements (Na, Mg, P, S, K, T i, Mn , Fe and Zn), and the halo is observed in the range of 2 °: 10 ° to 40 ° in the chart of the analysis by X-ray diffraction.

_{Here, A 1.0 3, S i 0} 2 and C a O and oxides to be combined, one or Other is 2 or more, A l ₂ 〇 _3, S I_〇 _2, C a O can use an oxide of a metal and Z or non excluding, for example, Na ₂ 〇, MgO, P. ₂ 0 _5, S_〇 _3, K ₂ 0, T I_〇 _2, MnO, can be selected from F e ₂ 0 ₃ and Z nO. This selection can be made based on the properties expected of the composite cured product.

For example, Na ₂ 〇 or K ₂ 0, because can be removed with an alkali, by performing the removal process prior to plating treatment, thereby acting as an anchor with because rougher is the plated surface of the composite cured surface Can be.

MgO contributes to _{A 1 2 0 3, S i} 0 2, C a O solid solution to strength development, greatly improve the bending strength Ya impact resistance.

P ₂ O ₅ is particularly advantageous when used in biomaterials (artificial roots, artificial bones) to aid in adhesion to bone.

so ₃ has a bactericidal action and is suitable for antibacterial building materials.

T I_〇 _2, together with a whitish coloring material, it either et acting as photooxidation catalysts, can be forcibly oxidize organic contaminants adhering, a self-cleaning power of Ru can be cleaned only by irradiation of light building It has a unique effect that it can be used as a material, various filters, and reaction catalysts.

MnO is dark color colorant, F e ₂ 0 ₃ is colorant bright color, Zn_〇 is useful as a colorant whitish.

These oxides may be present alone in the amorphous body. The composition of the amorphous body, in terms of _{A 1 2 0 3, S i} 0 2 and C a O, respectively, A 1 ₉ 〇 _q: 3 relative to the total weight of the composite cured body 51 wt ⁰ / _{0, S i 0 9: 6} 53 % by weight and C a O relative to the total weight of the double case hardened product: 3 63% by weight relative to the total weight of the composite hardened product, and the total is more than 100 wt% thereof It is preferable to contain it in a range that does not exist. When the content of CaO is 36% by weight, particularly high crushing toughness can be obtained. When the content is 663% by weight, the bending strength and the holding power of the nail can be improved.

This is because, when the content of A 1 ₂ 0 ₃ is more than or 51% by weight less than 3 wt%, lowers the strength of the composite cured body, also, S i 0 content less than ₂ is 6 wt% or 53 wt% Even when the amount exceeds the above range, the strength of the composite cured product is reduced. In addition, even if the content of CaO is less than 3% by weight or exceeds 63% by weight, the strength of the composite cured product also decreases. You do it.

Furthermore, beyond the C a O / S i 0 ₂ ratio 0. 2~7. 9, C a 〇 / A 1 ₂ 0 ₃ 0. ₂ ratio of in terms of oxide, 12. 5 below Adjustment is advantageous for obtaining high strength and a cured product.

Further, as the A 1 ₂ 0 _3, oxides other than S i 0 ₂ and _{C a O, Na 2 0,} M gO, P 2 0 5, S_〇 _3, K _{2 〇, T i 0 2, MnO,} F When one or more of e _{2 2 3} and Zn 含有 are contained, the preferred content of each component is as follows. It goes without saying that the total amount of these oxides does not exceed 100% by weight.

Na ₂ 0 0.. 1 to the total weight of the composite cured body: I. 2 wt%

 Mg〇: 3 to 11.0% by weight based on the total weight of the composite cured product

P ₂ O ₅ : 0.1 to 7.3% by weight based on the total weight of the composite cured body so ₃ : 0.1 to 3.5% by weight based on the total weight of the composite cured body κ ₂ ο Composite cured body 0.1 to 1.2% by weight based on the total weight of

 T i 0. : 0.1 to 8.7% by weight based on the total weight of the composite cured body

 Mn O: 0.1 to: 1.5% by weight based on the total weight of the composite cured product

_{F e 2 0 3: 0. 2~} 1 7. 8 % by weight relative to the total weight of the composite cured body

 Z 11 O: 1 to 1.8% by weight based on the total weight of the composite cured product The reason for limiting the content of these oxides to the above range is that if the content exceeds the above range, the strength of the composite cured product decreases. is there.

 The composition of Si, A1, and Ca in the present invention is the composition in the composite cured product, and is the total composition in the Ca-based crystal and the inorganic amorphous material. Therefore, when the inorganic substance is added, the composition includes the added inorganic substance.

In the present invention, the composition is tuned by selecting a papermaking sludge having a desired Ca component amount, mixing a plurality of papermaking sludges, and adjusting the composition by adding calcium carbonate and silica sand. Has been adopted. Papermaking sludge has various compositions, but generally has a low Ca component. This is because the pH is made acidic to agglomerate the papermaking sludge and does not remain on the side where the Ca component precipitates. If the desired composition cannot be obtained, it is necessary to add an inorganic component such as a carbonated calcium carbonate that appropriately mixes other papermaking sludges having different compositions. It should be noted that whether or not the amorphous structural force is present can be confirmed by X-ray diffraction. That is, if a halo is observed in the region of 2 °: 10 ° to 40 ° by X-ray diffraction, it can be confirmed that the material has an amorphous structure. In the present invention, in addition to those having a completely amorphous structure, Hydrogen Aluminum Silicate, Kaolinite, Zeolite, Gehlenite, syn, Anorthite, Melitite, Gehlenite-synthetic, tobermorite, xonotlite, ettringite and, S I_〇 _2, Ai ₂ 〇 _3, C A_〇, N a ₂ 〇, MgO, P ₂ 〇 _5, S_〇 _{3, K 2 0, T i} O. , MnO, oxides such as F e ₂ 0 ₃ Oyopi ZnO, and crystal such as C a C0 ₃ (Calcite) may be mixed.

 These crystals are not considered to be strength-generating substances by themselves, but are considered to have effects such as improving the compressive strength by increasing the hardness and density, and suppressing the progress of cracks. . The content of the crystal is desirably 0.1 to 50% by weight, particularly 3 to 48% by weight, based on the total weight of the composite cured product. If the content of the crystal is less than 0.1% by weight, the effect of increasing the hardness and density to improve the compressive strength or suppressing the crack growth cannot be sufficiently obtained, and conversely, the content exceeds 50% by weight. This causes a decrease in bending strength.

By the way, the above A 1 ₂ 〇 ₃ — S i 0 ₂ crystalline compound is Hydrogen Aluminum

Silicate, Kaolinite, Zeolite, A 1 2 〇 ₃ - C A_〇 based crystalline compound of

Calcium Aluminate, a C a O- S i O ₂ based crystal † raw compound _{Calcium Silicate, A 1 2 0 3} -S i 0 2 -C a O -based crystalline compound of Gehlenite, syn, Anorthite, also _{a 1 2 0 3 - S i} 0 2 -C a O- M G_〇 based crystalline compound of

Melitite, Gehlenite-synthetic.

Furthermore, it is desirable to include a C a as the crystals, Gehlenite, syn (C a 2 A 12 O 7), Melitite- synthetic (C a 2 (M g 0 5 A 1 0 5) (S i 1 5 A 10 ₅ O ₇ )), Gehlenite-synthetic (C a ₂ (Mg „„ ₅ A1. ₇

₅ ) (S i _{x 25} A 1 _{0 75} 0 ₇ )), Anorthite, ordered (C a ₂ A 1 ₂ S i ₂

〇 ₈ ) It may contain calcium carbonate (Calcite).

In the composite cured product produced by the production method of the present invention, halogen may be added to an amorphous material composed of at least two or more types of oxides. This halogen acts as a catalyst for solid solution and hydrate formation reactions, and also acts as a combustion inhibitor. You. Its content is preferably from 0.1 to 1.2% by weight. This is because, 0. 1 wt _^0/0 less than the strength is low, because generates harmful substances by combustion exceeds 1. 2% by weight. As the halogen, chlorine, bromine, and fluorine are preferable.

 Similarly, calcium carbonate (Calcite) may be added. Calcium carbonate itself is not a strength-expressing substance, but it is thought that the amorphous body surrounding calcium carbonate contributes to the improvement of the strength by preventing cracks from developing. The content of this calcium carbonate is desirably 48% by weight or less based on the total weight of the composite cured product. The reason for this is that if it exceeds 48% by weight, the flexural strength decreases. Further, the content is desirably 0.1% by weight or more. If the content is less than 0.1% by weight, it does not contribute to the improvement in strength.

 Furthermore, the addition of a binder is also advantageous for further improving the strength and for improving the water resistance, chemical resistance and fire resistance. The binder is desirably made of one or both of a thermosetting resin and an inorganic binder. As the thermosetting resin, at least one resin selected from phenol resin, melamine resin, epoxy resin and urea resin is desirable. The inorganic binder is preferably at least one selected from the group consisting of sodium silicate, silica gel, and alumina sol.

Next, in the method for producing a composite cured product of the present invention, an organic fibrous material composed of a polysaccharide is used as the organic fibrous material mixed in the inorganic amorphous material. This is because polysaccharides exist OH groups are, have Chasse bound to A 1 ₂ 0 _3, S I_〇 ₂ or various compounds of C a O through hydrogen bonding.

 The polysaccharide is desirably at least one compound selected from amino sugars, peruronic acid, starch, glycogen, inulin, lichenin, cenolerose, chitin, chitosan, hemicenolerose and pectin. As an organic fibrous material composed of these polysaccharides, in general, pulp, pulp grounds, waste paper powder frames such as newspapers and miscellaneous articles are advantageously applied.

'The content of the fibrous material is desirably 2 to 75% by weight. The reason for this is that if the content is less than 2% by weight, the strength of the composite cured product may be reduced, while if it exceeds 75% by weight, fire protection performance, water resistance and dimensional stability may be reduced. Furthermore, the average length of the fibrous material is desirably 10 to 1000 tm. Average length If the length is too short, no entanglement will occur, and if the length is too long, voids will be formed, and the strength of the composite cured product will be reduced.

 The above composite cured product 1 is optimally obtained by drying and coagulating and curing paper sludge (scum). In other words, papermaking sludge is a pulp residue containing inorganic substances, contains organic fibrous materials, and is low in cost because industrial waste is used as a raw material, thereby contributing to solving environmental problems. Moreover, the paper sludge itself has a function as a binder, and has an advantage that it can be formed into a desired shape by itself or by kneading with other industrial waste. .

Further, during the papermaking sludge, in addition to pulp, A 1 ₂ 0 _3, S I_〇 _{2, C a O, N a} 2 〇, M g O, P _n 〇 _5, S_〇 _3, K ₂ 0, T I_〇 _2, M n O, crystal or the F e ₂ 0 ₃ and Z n O sol-like material is a precursor of these oxides, or composite thereof, at least one selected from halogen and calcium carbonate It generally contains seeds and water.

 Here, as shown in FIG. 2, mixing the inorganic particles 4 in the composite cured body 1 improves the fire resistance or forms a strength-expressing substance by reacting with the amorphous body to form a strength-producing substance. The specific gravity of the composite cured product can be adjusted by adjusting the amount of the inorganic particles.

 As the inorganic particles 4, at least one selected from calcium carbonate, calcium hydroxide, shirasu, shirasu balloon, perlite, aluminum hydroxide, silica, alumina, talc, calcium carbonate, and industrial waste powder can be used. . In particular, as the industrial waste powder, it is desirable to use at least one or more types of industrial waste powder selected from calcined powder of papermaking sludge, abrasive dust of glass, and crushed silica sand. This is because the use of these industrial waste powders can reduce costs and contribute to solving environmental problems.

The inorganic particles obtained by calcining the papermaking sludge can be obtained by subjecting the papermaking sludge to heat treatment at 300 to 150 ° C. The inorganic particles thus obtained are amorphous, have excellent strength and toughness, and have a low density. Therefore, the inorganic particles can be dispersed in the composite cured product to achieve light weight. In addition, when papermaking sludge is fired at 300 ° C or higher and lower than 800 ° C, or after heat treatment at 300 ° C to 150 ° C, rapid cooling is performed. The resulting inorganic particles are advantageous because they surely contain an amorphous body. It is desirable that the inorganic particles 4 have a specific surface area of 0.8 to 100 m ² / g. If it is less than 0.8 m / g, the contact area between the amorphous body and the inorganic particles becomes small and the strength decreases.On the other hand, if it exceeds 100 mZg, effects such as crack development and improvement in hardness decrease. As a result, the strength is reduced.

 Further, it is desirable that the inorganic particles 4 contain at least one or more inorganic substances selected from silica, anoremina, iron oxide, calcium oxide, magnesium oxide, potassium oxalate, sodium oxide, and phosphorus pentoxide. These are chemically stable, have excellent weather resistance, and have desirable characteristics as industrial materials such as building materials.

 If the average particle size of the inorganic particles 4 is too small or too large, sufficient strength cannot be obtained, so that the average particle size is preferably in the range of 1 to 100 μπι. The content of the inorganic particles is desirably 10 to 90% by weight. That is, if the amount of the inorganic particles is too large, the strength is reduced, and if the amount of the inorganic particles is too large, the strength becomes brittle, and in any case, the strength is reduced.

 The composite cured product 1 produced by the method of the present invention is used in various industries, and may be used as a new building material to replace calcium silicate plate, perlite board, plywood, gypsum board, sound insulation, vibration damping material, etc. Can be.

 The composite cured product 1 produced by the method of the present invention is produced by the production method described below, so that the average moisture content is produced to 3% or less. Therefore, it has high dimensional stability and can be suitably used for the various industrial applications described above.

 Next, an embodiment of a method and an apparatus for treating paper sludge according to the present invention will be described with reference to FIGS. 3 to 10. FIG.

The papermaking sludge used in the manufacturing method of the present invention is generated at a papermaking factory that manufactures toilet paper and the like from high-quality waste paper (book, printing paper, information paper, kraft paper, and the like except for cardboard, newspaper, and magazines). A hardened body is manufactured from papermaking sludge. First, the configuration of the paper mill will be described with reference to FIG. The paper mill is equipped with a digester 70 that digests high-quality waste paper with steam while adding caustic soda. In the digester 70, the used paper is stirred by the stirring means 72 to be in a liquid state. After removing waste liquid that has become liquid, coarse foreign substances (fibers of spine of book, vinyl string, etc.) are removed with a coarse screen 76, water is poured from above onto a 60 mesh screen 82. The pulp 84 and the papermaking sludge (drainage) are separated in the washer 80. In other words, this wastewater consists of papermaking sludge (inorganic materials and fine pulp) and water.

 The wastewater from the washer 80 is led to the settling tank 86, where the papermaking sludge is settled. The sedimentation tank 86 may add papermaking sludge discharged from another process, for example, papermaking sludge discharged in a papermaking process of a craft pipe. Here, it is desirable to add a flocculant in order to increase the precipitation rate. A part of the supernatant liquid 88 in the sedimentation tank 86 is returned to the washing machine 80, used for separating pulp and papermaking sludge, and the rest is treated as wastewater. The flocculant is a flocculant composed of any of aluminum sulfate, ferric chloride, polyaluminum chloride, sodium polyacrylate, polymethacrylate, polyacrylate, and polyacrylamide (added). Amounts of 0.01 to 5%) can be used. On the other hand, the papermaking sludge settled in the sedimentation tank 86 is dehydrated by a screw press 92 having a pair of screws facing each other to form a block-shaped papermaking sludge with a solid content of 5 to 50%. 1 1 B is manufactured. By making the liquid papermaking sludge into a block shape, it is easy to transport and remove the hardened body to a manufacturing apparatus described later. Here, if the solid content exceeds 50%, a digestion facility is required to adjust the concentration to 0.5 to 25% by weight, which can be made by adding water in a later process, and the production process for the cured product is required. The strike rises. On the other hand, if it is less than 5%, the efficiency of transportation is reduced, and handling is difficult because it is liquid. Instead of using a screw press 92, a mat with a solid content of 5 to 50% is obtained by dewatering using a screen dewatering machine 96 in which belts suspended in a mouth are arranged opposite to each other and then cutting. It is also preferable to produce a paper sludge 11F in the form of flakes or flakes.

FIG. 4 shows a manufacturing apparatus for manufacturing a cured product from the above-described block-shaped papermaking sludge 11B having a solid content of 5 to 50% or mat-shaped or flake-shaped papermaking sludge 11F. 1 shows the entire configuration of the device. In the first embodiment, the above-described paper mill and the apparatus for producing the cured body are placed at a distance from each other, and block, mat, or flake-shaped paper sludges 11B and 11F are provided from the paper mill. It is transported to the cured product manufacturing equipment. The apparatus for producing the cured product includes a raw material adjusting mechanism 10 for adjusting the water content of the papermaking sludge to produce a slurry 14, a papermaking mechanism 20 for producing a papermaking body 26 from the slurry 14, and a papermaking body 26. An inverting device 40 for inverting the paper, a press 50 for laminating the paper 26 and pressurizing and dewatering, and a dryer 60 for drying the pressed paper and forming the cured body 1 Consists of

 First, a raw material adjusting mechanism 10 for adjusting a raw material will be described with reference to FIG. A block-shaped papermaking sludge 11-B or a mat-shaped or flake-shaped papermaking sludge 11-5F with a solid content of 5-50% is placed in a mixer 13 and the concentration is adjusted to a solid content of 0.5-25% by weight. Pour water so that it becomes. Then, a coagulant (a flocculant: added amount of 0. 0) composed of any one of aluminum sulfate, ferric chloride, aluminum polychloride, sodium polyacrylate, polymethacrylate, polyacrylate, and polyacrylamide. (1 to 5%) and organic fibers such as polyvinyl alcohol fibers (binder: 0.1 to 10% by weight) are added to the mixture and mixed in a mixer 13 to form a slurry 14. adjust. As the organic fiber (binder), synthetic fibers such as polyethylene, polypropylene, and vinylon, pulp recovered from pipes and waste paper, and other fibrous industrial wastes can be used. Raw materials can be added to paper sludge and various inorganic powders and resins.

 The slurry 14 is temporarily stored in the chest tank 18. The chest tank 18 is provided with a propeller for stirring, so that the solid content in the raw material does not settle.

 Subsequently, a papermaking machine 26 is formed by the papermaking mechanism 20 from the slurry 14 containing the papermaking sludge whose water content has been adjusted.

 In this papermaking method, a hardened body is manufactured by papermaking using a revolving drum of a net-like body. Since impurities drop off from the mesh, the impurities can be reduced and the brightness can be increased.

 Also, a cured product containing calcium carbonate,

C a, A l in the cured product, the amount of S i, C a O, respectively, A 1.0 _3, S i 0 ₂ from C a ozs i 0 ₂ weight ratio 0.2 in terms of 7.9, since the weight ratio of CaO / A l ₂ O ₃ is adjusted to 12.5 from 0.2, C a Increases the components and improves brightness. It also has high strength and nailing performance.

 For this reason, the brightness of the cured product can be N4 or more as a value based on the provisions of JIS Z8721.

 Note that JISZ 8721 sets the ideal black lightness to 0 and the ideal white lightness to 10, so that the perception of brightness is equal between these black lightness and white lightness. Each color is divided into 10 parts and indicated by the symbols N0 to N10.

 The actual lightness measurement contrasts with the color chart corresponding to NO to N10. In this case, the first place of the decimal point is 0 or 5. The lightness of the cured product can be N4 or more as a value based on the provisions of JIS Z 8721, so that coloring and decoration can be performed.

 An inorganic binder such as cement or an organic binder such as a resin may be added to the slurry (raw material solution). The papermaking mechanism 20 will be described with reference to FIG. The papermaking mechanism 20 includes three bats 21A, 21B, and 21C that store the slurry 14, and wire cylinders 22A, 22B, and 22C that are provided in the knot and that form the slurry 14. A transfer belt 23 that transfers and transports the paper 26 formed by the cylinders 22A, 22B, and 22C, and a cutting rotation that winds and cuts the paper 26 that has been transported by the transport belt 23 to a predetermined thickness. It includes a drum 30, a cutter 36 for cutting the paper 26, and a belt conveyor 38 for transporting the paper 26.

The wire cylinders 22A, 22B and 22C have a diameter of 70 cm and are formed in a single basket. In this embodiment, since the drainage body for draining (papermaking) is composed of a rotating drum (wire cylinder) composed of a net-like body, the papermaking body 26 can be continuously formed from the raw material solution 14, and the papermaking sludge can be efficiently produced. It is possible to mass-produce the cured product in a short time. The water permeated through the wire cylinders 22A, 22B, 22C is returned to the mixer 13 shown in FIG. 5 via the pipe 17a and the vacuum pump 17. Further, in this embodiment, three wire cylinders 22 A, 22 B, and 22 C are provided along the conveyor belt 23, and the paper cylinders are formed while being multilayered on the conveyor belt 23. Transfer 2 6 For this reason, the papermaking product 26 can be formed from the raw material solution 14 with high efficiency, and the cured product can be efficiently mass-produced from the papermaking sludge. In this embodiment, the rotation speed of the wire cylinder is set to 60 rotations Z. The number of rotations is preferably 1 to 100 times / minute. It is a force that makes it possible to make a papermaking product 26 from the raw material solution 14 with high efficiency, and to be able to mass-produce a cured product from papermaking sludge efficiently. Here, if the rotating drum is lower than one rotation Z, the papermaking efficiency is low. On the other hand, if the number of rotations exceeds 100 rotations, it becomes difficult to form a papermaking article with a uniform thickness. In this embodiment, three wire cylinders 22A, 22B, and 22C are provided in parallel, but one or more wire cylinders can be used.

 The meshes of the wire cylinders 22A, 22B and 22C are formed at # 60 (the number of meshes per inch is 60). The mesh of the wire cylinders 22A, 22B and 22C is preferably # 40 to 150. The reason is that the raw material solution (slurry) 14 can be formed with high efficiency and the papermaking body 26 can be efficiently produced, and the high-density cured body can be efficiently mass-produced from papermaking sludge. Here, if the mesh is coarser than # 40, only the inorganic amorphous material comes off from the raw material solution, and the density and strength of the cured product decrease. On the other hand, if the mesh is finer than # 150, the removal of water will be poor, and it will not be possible to produce a paper from the raw material solution with high efficiency. Since floc is formed in the papermaking sludge (raw material solution) by the coagulant, the papermaking can be performed efficiently. The concentration of the raw material solution containing papermaking sludge is desirably 0.5 to 25% by weight of solid content. This is because the papermaking property from papermaking sludge can be improved and the cured product can be efficiently mass-produced. That is, if the concentration is less than 0.5%, it is not possible to efficiently use a wire cylinder (filtration body) to make a paper from the raw material solution, and if it exceeds 25%, the uniformity of the product is reduced. . 3 to 6% is particularly desirable in terms of papermaking efficiency.

The transfer belt 23 that transfers and transports the paper formed by the wire cylinders 22 A, 22 B, and 22 C is made of felt having a width of lm, and is suspended by rollers 34. In addition, a suction box 24 is provided, and dehydration is performed while suction is performed by a vacuum pump 17. That is, the belt 23 adsorbs the moisture of the raw material 14 including the papermaking sludge into the pores of the filter, and the adsorbed moisture is adsorbed to the vacuum pump 17 side through the suction box 24, as shown in FIG. Returned to mixer 13 shown. This first real In the embodiment, the belt 23 is made of felt, but instead of this, a porous resin having continuous pores, a porous rubber, a material obtained by solidifying inorganic fibers with a binder or the like, a sintered metal, a porous metal, or the like is used. A belt in which a block of a metal or a porous metal is fixed with a flexible binder such as rubber can be used. In the present embodiment, the transport belt 23 is formed of a porous body having continuous pores, and is dewatered while being transported by the transport belt 23, so that the moisture in the papermaking body 26 can be efficiently reduced. . In the present embodiment, the transport speed of the transport belt 23 is set to 48 mZ, and the wire cylinders 22 A, 22 B, 22 C, and the rotary drum for cutting are synchronized with this. 30 and the belt conveyor 38 are driven by a motor (not shown). The transport speed of the transport belt 23 is desirably 5 to 8 OmZ. This is because a paper having an appropriate thickness can be formed from the raw material solution with high efficiency, and the cured body can be efficiently mass-produced. Here, if the conveying speed is lower than 5 m / min, a thick paper can be formed, but the paper forming efficiency is low. On the other hand, if the transport speed exceeds 8 OmZ, the paper becomes thin, it is difficult to make the thickness uniform, and the paper may be cut.

 The cutting rotary drum 30 for winding and cutting the paper conveyed by the conveyor belt 23 to a predetermined thickness is formed to have a diameter of 64 cm (outer circumference 2 m) and retain water on the surface. It has a storage groove 32 and a piano wire 31 housed in a housing groove 33 located near the groove 32. The cutting rotary drum 3'0 winds the surface of the papermaking body 26 conveyed from the conveyor belt 23 on the surface thereof while forming a multilayered structure.

Then, when the paper body 26 reaches a predetermined thickness (1.5 cm) and is detected by a sensor (not shown), the piano wire 31 in the housing groove 33 is pushed out. At the position along the storage groove 32, the papermaking material 26 has a high moisture content, and when the piano wire 31 is extruded, it is cut along the storage groove 32, as shown in FIG. 7 (A). The cut end falls on the belt conveyor 38 side. Then, with the rotation of the cutting rotary drum 30 and the transport of the velvet conveyor 38, the papermaking body 26 having a predetermined thickness is transported onto the belt conveyor 38 (see FIG. 7 (B)). Here, as shown in FIG. 7 (C), when the other cut end is conveyed to the corresponding position of the force cutter 36, the cutter 36 is lowered to the belt conveyor 38 side, and the papermaking body 26 The cut end of the sheet and the unlaminated paperboard conveyed on the conveyor belt 23 are separated. In the present embodiment, the paper body on the conveyor belt 23 is multilayered while being transferred to the rotary drum 30 for cutting, and when the multilayered paper body 26 reaches a predetermined thickness, a predetermined size is obtained. Cut into pieces. The rotary drum for cutting enables the continuous formation of the paper 26 with a uniform thickness (1.5 cm) and a large size (l mX 2 m), so mass production of the cured body is efficient. It becomes possible.

 Further, in the present embodiment, a cutter 36 for cutting the papermaking body 26 having one end cut by the cutting rotary drum 30 at regular intervals is provided. Therefore, it is possible to efficiently form the papermaking body 26 having a predetermined length (2 m). In the present embodiment, the thickness of the papermaking body 26 is set to 1.5 cm, but the thickness is desirably 2 cm or less. If the thickness is 2 cm or less, papermaking is easy and handling is easy even in transportation.

 The reversing device 40 for reversing the paper body will be described with reference to FIG. In the manufacturing apparatus according to the present embodiment, as described later, since the sheet bodies are alternately stacked while being inverted, the sheet bodies 26 are inverted every other sheet. The reversing device 40 includes a transport device 42 for sucking and transporting the papermaking body, a table 44, a reversing plate 46, and a force. As shown in FIG. 8 (A), the papermaking body 26 on the belt conveyor 38 is placed on the reversing plate 46 by the force transfer device 42. The reversing plate 46 is driven to reverse the paper body 46 (see FIG. 8 (B)). Then, as shown in FIG. 8 (C), the inverted papermaking machine 26 is transferred to the press machine 50 shown in FIG. 4 by the force transfer device 42. As described above, in the present embodiment, the binder is added to the slurry "″ 14 to make the papermaking body 26 flexible, so that handling after cutting is facilitated.

 A press 50 for pressurizing and dewatering a papermaking product will be described with reference to FIGS. 9 and 10. FIG. As shown in FIG. 9 (A), the press machine 50 includes a female mold 54 having a concave portion 54A and a female mold 52 fitted into the concave portion 54A. Fine through holes 54 a and 52 a for extracting moisture generated when the paper is pressed are formed in the forgos type 52, respectively. The press machine 50 is provided with a curtain coater 56 for applying the raw material solution 14 to the papermaking body 26 (see FIG. 9 (B)).

Lamination and pressurization in the press machine 50 will be described. First, as shown in FIG. 9 (A), refer to FIG. 8 (C) as the lowermost layer in the recess 54A of the female mold 54. The papermaking body 26, which has been inverted by the above-described reversing device 40 and has the contact surface side with the cutting rotary drum 30 facing downward, is carried in by the carrying device 42. Next, as shown in FIG. 9 (B), the raw material solution 14 is applied by a curtain coater 56 to the upper surface of the papermaking body 26, that is, the bonding surface with the upper layer papermaking body. The amount of raw material solution, per papermaking product one layer, a solid content is ^{5 0 g Zm 2 ~ 5 0} 0 g Zm 2 is preferred. Here, the curtain coater 56 is used, but various coating devices such as a roll coater can be used.

 As shown in FIG. 9 (C), the papermaking material 26 on the belt conveyor 38 is not turned over to the concave portion 54 A of the female mold 54 as the second layer of papermaking material, as shown in FIG. Will be carried in. Thereafter, as shown in FIG. 10 (A), after applying the raw material solution 14, the inverted papermaking body 26 of the third layer is placed, and after applying the raw material solution 14, the fourth layer is formed. The (top) non-inverted paper 26 is placed and the lamination is completed. Here, four layers are laminated, but any number of two or more layers may be used, and even one thin sheet may be used when manufacturing a thin cured product.

Thereafter, the female mold 52 is depressed, and a press is performed at 6 O kgm ² (see FIG. 10 (B)). At this time, the water that seeps out of the papermaking body 26 is led out through the through holes 54a and 52a. Thereafter, the female mold 52 is raised (see FIG. 10 (C)), and the composite cured body 1 formed by pressurization is taken out of the female mold and transported to the dryer 60.

 In this embodiment, since the pressurization is performed in the mold (concave portion 54A), even if the pressurization is performed at a high pressure, the papermaking body 26 does not break, and the high-strength cured body 1 can be produced from the papermaking sludge at a high yield. It can be manufactured. In addition, in order to provide through holes 52 a and 54 a for removing water seeping out of the papermaking body 26 on the female type 52 and the side 54, dehydration is performed at the time of pressurization. The curing step by drying can be completed in a short time. Further, since a plurality of papermaking sludge papermaking bodies are laminated with the raw material solution 14 interposed therebetween, a multilayer cured body free of peeling can be produced.

The pressure press is desirably performed at 10 to 25 O Kg m ² . If the pressing is performed at less than 10 kg / cm ² , the required strength cannot be obtained. On the other hand, the strength cannot be increased by press-pressing over 250 Kg m ² , and the press machine becomes larger and more expensive. In this embodiment, a plurality of papermaking sludge papermaking products obtained by papermaking the raw material solution using a wire cylinder (filtration body) are laminated. This is because it is inefficient to obtain a thickness and a paper body by papermaking.Thus, a thin paperboard is efficiently formed from papermaking sludge and laminated to produce a cured body of the required strength and thickness. I do. As a result, the mass of the cured product is efficiently produced from the papermaking sludge.

 Further, in the manufacturing method of the present embodiment, the papermaking sludge is efficiently formed by forming the papermaking body to have a thickness of 20 cm or less, and the cured body having the required strength and thickness is manufactured by laminating the papermaking sludge. . For this reason, it becomes possible to efficiently mass-produce the cured product from papermaking sludge.

 In the present embodiment, the papermaking bodies 26 are laminated while alternately inverting the lamination surface. That is, since the papermaking body 26 is laminated while reversing the direction in which the warpage occurs, the cured body 1 formed by laminating the papermaking body 26 does not warp and delamination does not occur. In addition, regarding the uppermost and lowermost papermaking bodies, the exposed surface is the surface that was in contact with the rotating drum, and the uneven surface that was in contact with the conveyor belt 32 made of felt is inside, The surface of the laminated cured product can be smoothed.

 Furthermore, in the present embodiment, since a flocculant is added to the raw material solution containing papermaking sludge to cause coagulation, the cured product 1 having a uniform specific gravity (in the range of 1.2 to 1.3) is mass-produced from papermaking sludge. Can be. Furthermore, in the present embodiment, since the lamination is performed in the female mold 54, it is not necessary to transfer the laminated papermaking body, which is suitable for mass production. In the present embodiment, the layers are stacked in the mold 54, but it is also possible to transfer the sheets into the mold after the lamination. After pressurized dewatering and drying with the above press machine 50 to reduce the water content, it is kept in a warehouse (not shown) for about 1 to 90 days, and is naturally dried until the water content becomes 3%. Thereafter, the resin is completely dehydrated by a dryer 60 shown in FIG. 4 to advance the curing reaction. The dryer 60 includes an electric heater 62 and a fan 64, and performs drying at a temperature of 80 to 200. Perform in C. The dryer 60 includes an electric heater 62, but an infrared heater, steam, a solar dryer, or the like can be used instead. Since the cured product largely shrinks due to a change in water content, it is desirable to dry the product for a certain period of time by natural drying and then to dry it for drying in order to maintain the shape stability.

The cured body 1 that has passed through the drying process is further transported and is then subjected to a predetermined Cut to size. Cutting is performed with a cutter or a saw placed on the conveyor.

 Then, as shown in Fig. 11 (A), the corner is chamfered with a grinder, and a C surface is provided. The hardened body 1 is formed as a panel-like (plate-like) floor material that provides a hollow portion for arranging computer wiring. Therefore, the cured body 1 is formed to have a thickness (h) of 25 mm and a width (w) of 5 Ocm. The C plane is preferably formed to have a length of 0.1 to 2 mm. As a result, when used as a panel-like flooring material, it is easy to handle and insert. Also, the corners are not chipped and broken. As shown in Fig. 11 (A), there is an advantage that the processing is easy when forming the C plane.

 On the other hand, as shown in FIG. 11 (B), it is also possible to form an R surface during chamfering. The R surface is preferably formed with a radius of l to 5 ram. This makes it easy to handle and fill when used as a panel-like flooring. Also, the corners are not chipped and broken. The chamfering may be performed after curing or at the time of molding before curing.

 Finally, the composite cured body 1 is inspected for warpage or the like by an inspection machine (not shown). X-ray sensors and infrared sensors can be used as inspection equipment. Further, the presence or absence of chipped cracks may be inspected by an image processing device or the like.

 An example of analyzing the composite cured product obtained in the above-described steps using a fluorescent X-ray analyzer (Rigaku RIX2100) is shown below.

 It was found that the composition was as follows in terms of oxide. The pulp was calcined at 1100 ° C and measured from the weight loss.

 Record

Pulp: 51.4 wt%, so ₃ 0. 5 wt% S i 0 ₂ 24. _{2 wt%, P 2 O 5: 0.} 2 _{wt% l 2 0 3 14. 0 C} 1: 0. 2 wt% C a O: 8.0% by weight, Z ηθ: 0.1

 Mg O: 1.4 wt%, other:

 T i o. Ten

As a panel-like flooring that provides a hollow part for arranging wiring for the computer The placed cured body 1 is shown in FIG. The figure shows a state in which one cured body 1 has been removed, and the wiring 102 arranged under the cured body 1 can be inspected. In this embodiment, since the hardened body 1 is chamfered, it is easy to remove and insert the hardened body even after construction, and to minimize injuries even if the worker accidentally falls on the foot or the like. Can be suppressed. In addition, there is no squeaking noise generated by rubbing corners.

 As described above, in the first embodiment, the separated papermaking sludge is dewatered by the screw press 92 and the screen dewatering machine 96. Then, water is added to the dewatered paper sludge to adjust the concentration, and then the paper is made using a filter body. In other words, by dewatering the paper sludge separated at the paper mill, it is easy to transport the paper sludge to a paper sludge treatment facility equipped with a drainage body, and the cured product from the paper sludge can be commercially profitable. Can be manufactured.

 Subsequently, a papermaking sludge treatment method and treatment apparatus according to a second embodiment of the present invention will be described with reference to FIGS. 13 to 15.

 In the first embodiment, the apparatus for producing a cured body is placed in a different place from the paper mill. For this reason, a block-shaped papermaking sludge 11B or a mat-shaped or flaked papermaking sludge 11F having a solid content of 5 to 50% was produced at a papermaking factory so as to facilitate transportation. On the other hand, in the second embodiment, an apparatus for producing a cured body is disposed in a paper mill. For this reason, as shown in Fig. 13, the screw press 92 for dewatering and the screen dewatering machine 96 are omitted, and the papermaking sludge 87 settled in the settling tank 86 is left as it is in Fig. 14. It is configured to be sent via a pipe 89 to a hardened body manufacturing apparatus shown in FIG. ,

FIG. 14 shows the configuration of a cured body manufacturing apparatus according to the second embodiment. An apparatus for producing a cured product includes a raw material adjusting mechanism 110 for adjusting papermaking sludge to generate a slurry 14, and a papermaking mechanism 20 for forming a papermaking body 26 from the slurry 14 similar to the first embodiment. A reversing device 40 for reversing the paper 26, a press machine 50 for laminating the paper 26 and pressurizing and dewatering the paper 26, and drying the pressed paper and drying the cured body 1 And a dryer 60 for forming

The raw material adjusting mechanism 110 of the second embodiment will be described with reference to FIG. The raw material adjustment mechanism 110 feeds the papermaking paper sent from the settling tank 88 through the pipe 89. The ludge 87 and water 12 are weighed into a mixer 13 by weighing so that the concentration becomes 0.5 to 25 (preferably 3 to 6)% by weight by solid-state dewatering described below. , Aluminum sulfate, ferric chloride, polychlorinated aluminum, sodium polyacrylate, polymethacrylic acid ester, polyacrylic acid ester, polyacrylamide . 0 0 1-5%), and organic fibers such as vinyl cutin fibers (binder: amount 0 1:. 1 0 wt _^0/0) was added, the slurry 1 were mixed at mixing engager 1 3 Adjust 4 Organic fibers (pinda) include synthetic fibers such as polyethylene, polypropylene, and vinylon, pipes, pulp recovered from waste paper, and fibrous industrial waste. Raw materials can be made by adding various inorganic powders and resins to papermaking sludge. Here, when the concentration of the papermaking sludge sent from the sedimentation tank 86 is low, it is not particularly necessary to add water. In addition, papermaking sludge discharged in another process may be added to the sedimentation tank 86.

 The slurry 14 is subjected to suction dehydration using a dehydration container 15 provided with a filter 16 at the bottom. By suction dehydration, the concentration is adjusted to 0.5 to 25 (preferably 3 to 6)% by weight of the solid content. In suction dehydration, the fibers of the papermaking sludge are not oriented, so that the resulting composite cured product is less likely to warp or crack. The bottom of the dehydration vessel 15 is connected to a vacuum pump 17, and the vacuum pump 17 is operated to suck moisture. The filter 16 is not particularly limited, but includes sintered metal, porous metal plate (metal plate with a hole having a diameter of l to 5 ram), porous ceramic filter, porous resin, glass fiber plate and the like. Can be used. The raw material 14 whose water content has been adjusted in the dehydration container 15 is temporarily stored in a chest tank 18. The chest tank 18 is provided with a propeller for stirring, so that solids in the raw material do not settle.

Subsequent steps are the same as in the first embodiment described above with reference to FIG. In the second embodiment, after the digested paper is washed with water to precipitate the papermaking sludge separated from the pulp, the raw material solution containing the precipitated papermaking sludge is made using a filter body. That is, the papermaking sludge separated from the pulp is settled before papermaking, so that the concentration can be easily adjusted. In addition, since dehydration is once performed at the paper mill, and the amount of water equivalent to the dewatered amount is not added to the cured product manufacturing equipment, Energy equivalent to dehydration can be saved. Thus, a cured product can be produced from papermaking sludge to make it commercially viable.

 In the second embodiment, papermaking sludge separated from pulp is efficiently formed in order to adjust the solid content to 0.5 to 25 (preferably 3 to 6) wt% in the dewatering vessel 15. This allows the production of hardened products from paper sludge to be commercially viable.

 Next, a method and an apparatus for treating papermaking sludge according to a third embodiment of the present invention will be described with reference to FIG.

 In the third embodiment, as in the second embodiment, a device for producing a cured body is disposed in a paper mill. However, in the third embodiment, the sedimentation tank 86 provided in the second embodiment is omitted, and the wastewater containing the papermaking sludge separated from the water washer 80 is connected to the second embodiment via a pipe 89. It is configured to be sent to a similar cured product manufacturing device. In addition, in the water washer 80, when pouring water into the waste paper digested in the digester 70, the waste liquid having a high concentration of papermaking sludge at the start of pouring is sent to the hardened body manufacturing equipment side, and papermaking at the end of pouring It is preferable to treat the waste liquid having a low sludge concentration as a waste liquid, or to send the waste liquid to a hardened body manufacturing apparatus via a sedimentation tank as in the second embodiment.

 In the third embodiment, the digested paper is washed with water, the concentration of the papermaking sludge separated from the pulp is adjusted, and the raw material solution containing the adjusted concentration of the papermaking sludge is filtered using a filter body! The papermaking sludge is adhered to the surface of the filter body. That is, since the papermaking sludge separated from the pulp is once dehydrated in a papermaking factory, and water is not added in an amount equivalent to the dewatered amount in a hardened body manufacturing apparatus, energy equivalent to dewatering can be saved. No precipitation is performed. For this reason, cured products can be produced from papermaking sludge to make it commercially viable.

 In the third embodiment, papermaking sludge separated from pulp is efficiently produced in order to adjust the solid content to 0.5 to 25 (preferably 3 to 6) wt% in the dewatering vessel 15. This allows the production of hardened products from paper sludge to be commercially viable.

The specific gravity was 1.16 in the first embodiment, 1.20 in the second embodiment, and 1.30 in the third embodiment. On the other hand, even under the same conditions as in the embodiment, when no cooking was performed, the specific gravity was 1.00. Thus, the inorganic components can be efficiently extracted by cooking.

 (Example 1)

 (1) 100 parts by weight of high-quality waste paper for OA equipment, 200 parts by weight of water, and 100 parts by weight of sodium hydroxide are mixed together, and cooked using a digester (a sphere with a stirring blade inside. And then rotated while blowing steam to make it liquid.

 (2) The liquid digest was placed on a 60-mesh screen, and water was poured into the screen to separate it into pulp and wastewater containing papermaking sludge.

 (3) Next, this wastewater was accumulated in the sedimentation tank. Further, papermaking sludge having the following composition discharged from kraft paper was added and mixed at a ratio of 1: 1. The composition in the solid component is as follows

 Pulp 76.0% by weight Mg O: 0

S i 0 ₂ 6. 0% by weight

A 1 ₂ 0 ₃ 1 3. 5 weight ^_0/0

 2.6% by weight of C a O

 Other trace

 As a result of the addition and mixing, the following composition was obtained.

 (4) The mixed papermaking sludge is screen pressed to form flakes, and then 0.3% by weight of vinyl fiber and water are added to adjust the slurry to a solid content of 5%. did.

 (5) A paper was made using this slurry.

 The wire cylinder is # 60, the diameter is 70cm, the width is lm, the number of rotations is 60, the belt transfer speed is 48mZ, and the making roll is 64cm in diameter. The size of the press mold was 180 OmmX 1000 bunks. Also, 45 push rods of 19 OmrnD were used.

 The composition of the cured paper sludge obtained is shown below. The specific gravity was 1.16.

 Pulp 5 1. t% Mg O: 1.4% by weight

S i 0 ₂ 24.SO 0.

A 1 ₂ 0 ₃ 1 4 P ₂ O ₅ 0.2% by weight

C a O 8. C 1 0.2% by weight T io ₂ Z ηθ: 0.

Other

 (Example 2)

 Same as Example 1 except that the ratio of the amount of papermaking sludge discharged from kraft paper to the amount of papermaking sludge obtained by digestion was changed. That is, the amount of sludge obtained by cooking at a ratio of 1: 2 was increased.

 The composition of the cured paper sludge obtained is shown below.

Pulp: 43.2 weight% M g O: 0. 9 weight ^_0/0

S i 0 _2: 30. 0 wt% SO _s: 0. 5 wt%

_{A 1 2 0 3: 14. '} 2 0 5: 0.

 C a O: 9.8% by weight C 1: 0.1

 T i O-. : 0.7 weight. /. Η η 0: 0.

Other trace

 Further, the concentration was adjusted to 5% by dehydration in a dehydration vessel as shown in FIG. The specific gravity was 1.20.

 (Example 3)

 Papermaking was performed using papermaking sludge obtained by digestion.

 The composition of the cured paper sludge obtained is shown below. The specific gravity was 1.3.

Pulp: 26. 8 weight _^0/0 Mg ^Ο: 1.

S i 0 _2: 42. 4 wt% SO _3: 0. 1 wt%

_{A 1 2 0 3: 1 5.} 0 wt% p ₂ o _5: 0. 1 wt%

 C a O: 13.4% by weight C 1: 0.1% by weight

T i O ₂ : 1.0% by weight Z ηθ: 0.05 weight

Other trace

 (Example 4)

 Unfired papermaking sludge (papermaking sludge of Mino Paper Co., Ltd. handled by Maruto Kiln Co., Ltd .: solid content 34% by weight, water content 66% by weight) 3020 parts by weight were prepared. Next, acid washing was performed using a 2 N hydrochloric acid aqueous solution to remove the Ca component almost completely.

A Pulp 51. Mg O

S i 0 ₂ 18.SO 3.

 C a O 0. C 1: 0.

 SO ^ 1 1.Z ηθ 0.

Other trace

 In addition, 〇A high-quality waste paper for equipment was digested and washed in the same manner as in the example to obtain papermaking sludge B.

 B

 Pulp 21. S i O 4.

A 1 ₂ 0 ₃ 7 Ρ, Ο 0

C a O 65.N a ₂ 0 0.

so ₃ 0,

 Other

The amount of calcium carbonate was 55% by weight.

Also, paper sludge ink jet printer paper Maki papermaking Corporation Maruhigashikamazaisha handled: solids 51 weight _^0/0, further Karushiumu carbonate water 49 weight _^0/0 (cubic shape) were added 10 wt% And C.

 C

Pulp ― 16.4% by volume sio ₂ 2.

A 1 ₂ 0 ₃ 5.5 wt% P ₂ O _S 0

C a O 75.0% by weight N a ₉ 0 0.

S0 ₃ 0.2% by weight

 Other

The amount of calcium carbonate was 65% by weight.

Samples were prepared by appropriately mixing ABC as described above, and papermaking was performed using the apparatus shown in FIG. The wire cylinder is # 60, the diameter is 7 Ocm, the width is lm, the number of rotations is 60, the belt conveyance speed is 48mZ, and the making roll is 64cm in diameter. The solid content of the raw material is 5%. The size of the press mold was 1800 ram X l 000 mm. 45 push rods with 19 Omm mouth were used. The results of measuring the flexural strength, compressive strength, nailing properties, lightness, and fracture toughness of the cured body are shown in the graphs of Figs. Fig. 17 shows the relationship between Ca O / S i 0 ₂ and the compressive strength and lightness. The vertical axis shows the compressive strength (KgZcni ² ) and the lightness (N), and the horizontal axis shows Ca O / S i〇 ₂ Is taken. FIG. 18 C a O / A 1 ₂ 〇 ₃ and compressive strength, shows the relationship between lightness, C compressive strength on the vertical axis (Kg / cm ²⁾ and lightness (N) on the horizontal axis a OZA 1 ₂ 0 The ratio of ₃ is taken. The first Figure 9, C a O content and the bending strength of, shows the relationship between the compressive strength, the content of C a O on the vertical axis bending strength 'compressive strength (Kg / cm ²⁾ on the horizontal axis (% ) Is taken. Fig. 20 shows the relationship between the content of CaO and the nail pull-out strength and fracture toughness, and the vertical axis shows the nail pull-out strength (Kg / cm ² ) and the fractured paddy property (MP a-m ^1/2 ). The axis shows the content of C a O (%). The fracture toughness peaks at 3 to 6% by weight in terms of 0 & 0. The nail pull-out strength is based on 2 OKgZcm ^2, but is in the range of 4 to 63% by weight in terms of 0 & 0.

 A similar tendency appears in bending strength and compressive strength.

Furthermore, by adjusting the ratio of C a O / S i〇 ₂ from 0.2 to 7.9 and the ratio of C a〇 / A l ₂ 〇 ₃ from 0.2 to 12.5, the compressive strength and lightness N4 0 or more can be achieved.

 Since the used paper is used, the color of the ink remains and the ink turns blackish.In the press method, it changes from N3.0 to 3.5, but in this papermaking method, it becomes N4.0 or more.

 (Comparative Example 1)

 As in Example 1, the waste paper was not digested, but the waste liquid washed with the waste paper was mixed with the papermaking sludge of kraft pulp with a high fiber content. Even after the papermaking, the inorganic component was small, and the specific gravity was 0.8 in the following composition.

Pulp: 74.0 wt.% Mg O: 0. 1 weight ^_0/0

S i O ₂ : 8.0% by weight

A 1 ₂ 0 _3: 13. 5 wt ^_0/0

 C a O: 2.7% by weight

 Other trace

 (Comparative Example 2)

In addition, the same as Comparative Example 1 was performed, but a cured body was obtained by a press method instead of papermaking. Specific gravity of the following composition was 0.0

 Pulp: 74 Mg O: 0

S i 0 ₂ : 9.

A 1 ₂ 0 _3: 14. 0 wt%

 C a O: 2

 Other

 (Comparative Test Example 3) No sol-gel method Ca-based crystals

 Pulverize a mixture of ethyl alcohol and waste paper with a pole mill for 1 hour. Sol solution with 40 parts by weight of tetraethoxysilicate, 3 parts by weight of tripropoxyaluminate, 30 parts by weight of canolecum dimethoxide, 66 parts by weight of ethyl alcohol, 18 parts by weight of water, and 1 part by weight of 0.1 N hydrochloric acid I got The pulverized material and the sol solution were mixed, poured into a mold, dried at 100 ° C. for 24 hours, further impregnated with phenol resin, and cured at 60 ° C.

 When this cured product was examined by X-ray powder diffraction, there was no Ca-based crystal. It seems that calcium carbonate in the waste paper was dissolved with hydrochloric acid.

 The average specific gravity is 0.98, the maximum specific gravity is 1.09, the minimum specific gravity is 0.90, and the variation is 11.2%.

 Furthermore, the dimensional change rates of the example 1, the example 2, the example 3, the comparative example 1, and the comparative example 2 when immersed in water for 24 hours were measured. The results are shown. Also indicate the lightness. Furthermore, the transmission loss (d b) at 2000 Hz representing the sound insulation was measured.

Dimensional change X—Y Dimensional change Z Lightness Transmission loss Example 1 3% 20% N4.55 Example 2 2% 15% N 5.055 Example 3 1% 1 1% N5.0 60 Comparative example 1 15 % 40% N 3.540 Comparative Example 2 16% 38% N3.55 Comparative Example 3 20% 40% N 3.030 Thus, by digestion, inorganic components can be removed from waste paper, A high-density composite cured product can be obtained. Also, make sure the fibers are The dimensional stability during moisture absorption is also excellent because it can be absorbed.

 As described above, according to the present invention, the dimensional change rate is small, the density is high, the transmission loss is high, and the dimensional change is difficult. It is especially effective in building materials such as soundproofing, vibration damping materials, floor boards, ceiling boards, and wall materials, and is suitable as a building material. A composite cured product obtained by curing papermaking sludge obtained by mixing A, B, and C in the above Example 4 at a ratio of 1: 3: 1 is cut into a size of 1 mm × 1 mm and a thickness of 2 mm. A board A with a 1 mm C-plane, a board B with the same size and a 1 mm R-plane, and a board C with no chamfer were manufactured.

 When boards A, B, and C were laid out as shown in Fig. 12 and they walked on each other, no squeak was observed on boards A and B, but squeak was generated on board C. The squeak noise is considered to be caused by the rubbing of the corners between the boards, but in the present invention, there is no such squeak noise because there is no corner.

 In addition, sound transmission loss and loss coefficient were measured at a frequency of 125 to 4000 Hz at a thickness of 2 ram. The transmission loss indicates sound insulation, and the loss coefficient indicates vibration suppression. As shown in FIGS. 21 and 22, surprising results have been obtained in that the provision of the chamfered shape increases the passage loss and the loss coefficient. We estimate that chamfering will make the board more likely to vibrate and absorb sound energy. Therefore, it is particularly effective for building materials such as soundproofing materials, vibration damping materials, flooring materials, ceiling materials, and wall materials.

 As described above, the present invention is particularly effective in building materials such as soundproofing materials, vibration damping materials, flooring materials, ceiling materials, and wall materials, and is easy to fit when used as a building material, and lacks corners. There is no squeak noise generated by rubbing of the corners. Furthermore, surprisingly, it is possible to improve sound insulation and vibration damping.

 (Example 5)

 The composition of the hardened papermaking sludge obtained by pacing in the same manner as in Example 1 is shown below. The specific gravity was 1.16.

Pulp: 51.2 weight% M g O: 1. 4 weight ^_0/0

S i 0 _2: 24. _{2 wt% A 1 2 0 3: 14} .

P ₂ 0 _5: 0. _2% by weight C a O: 8.0% by weight C 1: 0.

T I_〇 _2: 1.0 weight ^{_0/0 Ζ ηθ: 0}

Other trace

 (6) The cured composite was naturally dried at room temperature for one week to reduce the water content to 4%, and then dried at 140 ° C for 70 minutes. The cured composite showed an equilibrium water content of 2.8% at 25 ° C and a humidity of 30%.

 (Example 6)

 Same as Example 1 except that the ratio of the amount of papermaking sludge discharged from kraft paper to the amount of papermaking sludge obtained by digestion was changed. That is, the amount of sludge obtained by cooking at a ratio of 1: 2 was increased.

 The composition of the cured paper sludge obtained is shown below.

Pulp: 43.2 weight% M g O: 0. 9 weight ^_0/0

 S i 0-30.

A 1 ₂ 0 ₃ 14.P ₂ 〇5 0

 C a O: 9. C 1: 0.1% by weight

 T i Ο „0 Z n〇: 0

Other trace

 Further, the concentration was adjusted to 5% by dehydration in a dehydration vessel as shown in FIG. The specific gravity is

It was 1 20. This composite cured product has an equilibrium moisture content at 25 ° C and a humidity of 30% 2.

5%.

 (Example 7)

Sulfuric acid were added Aruminiumu mixed slurry 3 wt _^0/0 of Example 1

 Pulp: 43. Mg O: 0.

 S i 0. : 29. SO 3 0.

A l ₂ 0 ₃ 14.P ₂ O ₅ 0.

 C a O: 9. C 1: 0.1% by weight

_{T i 0 2: 0 Z ηθ} : 0

Other trace

This composite cured product showed an equilibrium moisture content of 4% at 25 ° C and a humidity of 30% (Example 8). Unfired papermaking sludge (papermaking sludge of Mino Paper Co., Ltd. handled by Maruto Kiln Co., Ltd .: solid content 34% by weight, moisture 66% by weight) 3020 parts by weight were prepared. Next, acid washing was performed using a 2N aqueous hydrochloric acid solution to partially remove the Ca component. Paper was made using this sludge.

 Pulp 51. Mg O 1.

sio ₂ 18 6 wt% SO, 3.

A 1 ₂ 0 ₃ 22 P ₂ O ₅ 0

 C a O 0. C 1 0.1% by weight

so ₃ Ζ ηθ 0.1 wt%

Other trace

The equilibrium moisture content was 5%.

 (Comparative Example 4)

 The same as in Example 1, but the waste paper obtained by crushing and washing the waste paper was mixed with the papermaking sludge of kraft pulp with a high fiber content without digesting the waste paper. Even after papermaking, the inorganic components were small, and the specific gravity was 0.8 with the following composition.

 Pulp: 75.5% by weight Mg O 0

 S i 0. 8.0% by weight

A 1 ₂ o ₃ 13.0% by weight

 C a O: 2.

 Other

The equilibrium moisture content was 6%.

 (Comparative Example 5)

Aluminum sulfate papermaking sludge kraft pulp 3 wt _^0/0, was added carbon Karushiu arm 3 wt%. The composition is as follows.

 Pulp: 75.8 weight. /. Mg O: 0

S i O 5.9% by weight S〇 _Q : 0

A 1 ₂ 0 _3: 12. 8 wt%

 C a O: 4.0% by weight

 Other

The equilibrium moisture content was 6%. (Comparative Example 6)

 Unfired papermaking sludge (papermaking sludge of Mino Paper Co., Ltd. handled by Maruto Kiln Co., Ltd .: solid content 34% by weight, water content 66% by weight) 3020 parts by weight were prepared. Next, acid washing was performed using a 2N aqueous hydrochloric acid solution to partially remove the Ca component. Paper was made using this sludge.

 Pulp 51. Mg O 1.

sio ₂ 16.

A l ₂ 0 ₃ 20 P ₂ O ₅ 0.

 C a〇 0. C 1: 0.1% by weight

so ₃ 1.Ζ ηθ 0.1% by weight

Other trace

The equilibrium moisture content was 6%.

 Furthermore, for Example 5, Example 6, Example 7, Example 8, and Comparative Example 4, Comparative Example 5, and Comparative Example 6, the dimensional change rate was measured when left at 30% humidity and 80% humidity for 1 week. did. The results are shown.

 Moisture content after flattening Dimension change Χ_Υ (30%) Dimension change X-- 80 (80%) Example 5 2 8 3% 5% Example 6 2 5 2% 5% Example 7 4 5% 2% Example 8 5 5% 3% Comparative example 4 6 10% 1 1% Comparative example 5 6 10% 12% Comparative example 6 6 1 1% 1 2%

 As described above, a composite cured product having an equilibrium water content of 3% or less has excellent dimensional stability at normal humidity, and a dimensional stability at high humidity of more than 3% and less than 6% at normal humidity. A composite cured product with an equilibrium water content of 6% or more has poor dimensional stability under any conditions.

 As described above, the cured product of the present invention has a small dimensional change rate, and is particularly effective in building materials such as soundproofing, vibration damping materials, floor boards, ceiling boards, and wall materials, and is suitable as a building material. .

Claims

The scope of the claims  1. A method for treating paper sludge, comprising at least the following steps:  (a) cooking the paper;  (b) separating papermaking sludge from the cooked digest;  (c) a step of drying and curing the papermaking sludge to obtain a cured product.  2. A method for treating paper sludge, comprising at least the following steps:  (a) cooking the paper;  (b) washing the digested cooked product with water to separate papermaking sludge; (c) papermaking a raw material solution containing papermaking sludge using a filter body, attaching the papermaking sludge paperwork to the surface of the filter body, and transferring the papermaking body to a transport belt;  (d) a step of curing the papermaking body to obtain a cured papermaking sludge. 3. A method for treating paper sludge, comprising at least the following steps:  (a) cooking the paper;  (b) washing the digested cooked product with water to separate papermaking sludge; (c) dewatering the separated papermaking sludge;  (d) adjusting the concentration by adding water to the dewatered papermaking sludge;  (e) papermaking the raw material solution containing the papermaking sludge whose concentration has been adjusted using a filter body, attaching the papermaking sludge paperwork to the surface of the filter body, and transferring the papermaking body to a transport belt;  (f) a step of curing the papermaking body to obtain a cured papermaking sludge. 4. The papermaking sludge treatment method according to claim 3, wherein the dewatering in (c) sets the solid content to 5 to 50%.  5. A method for treating paper sludge, comprising at least the following steps:  (a) cooking the paper; (b) washing the digested cooked product with water to separate papermaking sludge; (c) settling the separated paper sludge;  (d) papermaking the raw material solution containing the precipitated papermaking sludge using a filter body, attaching the papermaking sludge paperwork to the surface of the filter body, and transferring the papermaking body to a conveyor belt;  (e) a step of curing the papermaking body to obtain a cured papermaking sludge.  6. It is characterized by having at least the following steps! ^ How to treat sludge:  (a) cooking the paper;  (b) washing the digested pulverized product with water to separate papermaking sludge; (c) adjusting the concentration of the separated papermaking sludge;  (d) preparing a raw material solution containing the papermaking sludge of which the concentration has been adjusted, using a filter body to form a paper, attaching the papermaking sludge paperwork to the surface of the filter body, and transferring the papermaking body to a conveyor belt;  (e) a step of curing the papermaking body to obtain a cured papermaking sludge. 7. The method for treating papermaking sludge according to claim 6, wherein the solid content is adjusted to 3 to 6% by the concentration adjustment in (c).  8. An apparatus for treating paper sludge, comprising at least the following: (a) a digester for digesting paper;  (b) a washing device for washing the cooked pulverized product with water to separate papermaking sludge; and (c) a curing device for drying and curing the papermaking sludge.  9. An apparatus for treating paper sludge, comprising at least: (a) a digester for digesting paper;  (b) a washing device for washing the cooked pulverized product with water to separate paper sludge; (c) a filter body for forming a raw material solution containing papermaking sludge and attaching a papermaking sludge paperwork to the surface;  (d) a transfer belt for transferring the paper body on the surface of the drainage body;  (e) a cutting device for cutting the filter body of the transfer belt;  (f) A curing device for curing the cut filter body.  10. A cured body consisting of an inorganic amorphous body and a fibrous material, A cured product having chamfered corners. 1 1. A cured product obtained by curing papermaking sludge,  A cured product having chamfered corners.  12. The cured product according to claim 10, wherein the chamfer is provided with a C surface.  13. The cured body according to claim 10 or claim 12, wherein the chamfer is provided with an R surface.  14. A hardened papermaking sludge, a composite hardened body composed of an inorganic amorphous material composed of oxides of Si, Al, and Ca and an organic fibrous material,  A cured product having an equilibrium water content of 3% or less.  15. A hardened papermaking sludge, a composite hardened body composed of an inorganic amorphous material composed of oxides of Si, Al, and Ca and an organic fibrous material,  A cured product having an equilibrium water content of more than 3% and less than 6%.  16. A hardened papermaking sludge, a composite hardened body composed of an inorganic amorphous material composed of oxides of Si, Al, and Ca and an organic fibrous material,  A cured product, wherein the content of the Ca component in the composite cured product in terms of CaO is 3% by weight or more, and the content of the organic fibrous material is 75% or less. 17. A hardened papermaking sludge, a composite hardened body composed of an inorganic amorphous material composed of oxides of Si, A1, and Ca and an organic fibrous material,  A cured product, wherein the content of the organic fibrous material is 75% or less, and an oxide of S is contained. 18. The cured body according to any one of claims 15 to 17, wherein a coating is applied by exposing a part of the surface of the cured body.