JP2002018392A - Treating method for incineration ash and aging facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a treating method for incineration ash capable of recycling granular materials in the incineration ash by efficiently making the granular materials non-polluting, and to provide aging facilities capable of efficiently and stably preventing the elution of heavy metals. SOLUTION: The incineration ash is fed into frictional crushing treatment devices 30 and 50 where the granular materials are made into finer grains by adding water thereto and acting the force to rub the granular materials against each other thereon and the fine grain components containing hazardous materials, such as heavy metals and dioxins, at high ratios are separated from the surface of the granular materials and thereafter the fine-grain incombustibles in the incineration ash are extracted by a vibration screen 60. These incombustibles are supplied to the aging facilities 80 where carbon dioxide is supplied thereto while a proper volume of water is added to the granular materials to bring the granular materials into contact with the carbon dioxide.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a method for detoxifying incineration residues of an incinerator containing heavy metals so that the residues can be reused.
The present invention relates to an aging facility for preventing elution of heavy metals.

[0002]

2. Description of the Related Art Conventionally, combustible materials such as garbage that cannot be recycled are mainly incinerated in a stoker-type incinerator or a fluidized-bed incinerator, and the incineration residue of the incinerator is discharged to a waste disposal site as incinerated ash. Is buried. Since the incineration residue (hereinafter referred to as incineration ash) contains incinerated metal scraps, pieces of glass or pottery, and earth and sand mixed with the above combustibles, various types of incineration ash Metals, silica, alumina, lime, etc. are mixed. Such incinerated ash has a large amount of waste, and harmful substances such as heavy metals and dioxins generated in the incineration process adhere to the incinerated ash. The establishment of utilization technology is desired.

[0003]

By the way, incinerated ash is often mixed with slaked lime (Ca (0H) ₂ ) in order to remove hydrogen chloride generated during combustion. And heavy metals such as lead are easily eluted. Therefore, when the incinerated ash is rendered harmless and reused, outdoor deposition (aging treatment) has conventionally been performed. The above-mentioned aging treatment is carried out for several weeks while giving appropriate moisture to the incinerated ash, for example, by allowing the incinerated ash to stand still in an outdoor stock yard or the like and contacting it with carbon dioxide in the air to reduce alkalinity due to a neutralization reaction, By promoting a chemical reaction such as lead incorporation accompanying the formation of ₃ , the elution of heavy metals is prevented. However, the aging process requires an enormous amount of time of several weeks to complete, and requires a large stock yard to process a large amount of incinerated ash. Furthermore, since the aging process itself relies on a chemical reaction that proceeds naturally, there is a problem that the effect of preventing elution of heavy metals is unstable.

On the other hand, a heavy metal solidifying agent is added to a fly ash containing a large amount of heavy metals such as cadmium, lead, and chromium hexahydride, which is generated in an incinerator and collected by an electric dust collector, and kneaded. Thereafter, a method has been proposed in which a gas containing carbon dioxide is brought into contact to prevent elution of carbon dioxide heavy metals and used for landfilling (Japanese Patent Laid-Open No. 11-188331). This is to neutralize the alkali in the heavy metal-containing fly ash by reacting it with carbon dioxide, lower the pH to prevent the elution of the heavy metal, and to convert the heavy metal in the fly ash into a hardly soluble carbonate. Thus, the effect of preventing heavy metals from being dissolved by the heavy metal solidifying agent is enhanced. However, the incineration residues of incinerators subject to weight reduction or detoxification are:
Unlike the fly ash, it contains a large amount of granules having a large particle size and is in the form of aggregates in which the granules are fixed to each other. The reaction did not proceed easily, and the elution of heavy metals could not be sufficiently prevented. Therefore, the above incineration residue is crushed into, for example, a granular material of about 100 μm or less,
After performing a pretreatment to increase the contact area with the heavy metal solidifying agent and carbon dioxide, it is conceivable to perform the same insolubilization treatment as in the case of the fly ash, but in this method, the incineration residue is reduced. In addition to the inability to convert the incineration ash, there is a disadvantage that the efficiency of treating incinerated ash is reduced. Furthermore, since the crushing treatment is performed, there is a problem that the granular material having a large particle diameter in the incineration ash cannot be reused as, for example, aggregate for concrete.

[0005] The present invention has been made in view of the conventional problems, and a method for treating incinerated ash that can efficiently detoxify and reuse the particulate matter in the incinerated ash and prevent elution of heavy metals. It is an object of the present invention to provide an aging facility that can efficiently and stably perform the aging.

[0006]

According to a first aspect of the present invention, there is provided a method for treating incinerated ash, comprising extracting a granular material having a predetermined particle size or more from the incinerated ash and applying an appropriate amount of water to the granular material. The present invention is characterized in that the granular material is brought into contact with the atmosphere and is brought into contact with carbon dioxide in the atmosphere.

According to a second aspect of the present invention, there is provided a method for treating incinerated ash, comprising extracting a granular material having a predetermined particle size or more from the incinerated ash, supplying a gas containing carbon dioxide while giving an appropriate amount of water to the granular material, The method is characterized in that the granular material is brought into contact with carbon dioxide.

According to a third aspect of the present invention, there is provided a method for treating incinerated ash, which comprises subjecting the granulated material in the incinerated ash to a grinding treatment step of rubbing together under water to make the granules fine. The body is supplied to a classification step to extract a granular body having a predetermined particle size or more.

According to a fourth aspect of the present invention, there is provided a method for treating incinerated ash, comprising supplying the granular material refined in the grinding step to a classifying step, and classifying and extracting coarse incombustibles having a large particle size. After doing
By supplying the remaining granular material from which the coarse incombustible material has been removed to a fine particle separation device, a granular material having a smaller particle size than the coarse incombustible material and having a predetermined particle size or more from which fine particles are separated can be obtained. It is designed to be extracted.

According to a fifth aspect of the present invention, there is provided a method for treating incinerated ash, wherein the fine particles obtained in the grinding step are supplied to a fine particle separation device to separate fine particles, and the fine particles are separated. This is to extract a granular material having a predetermined particle size or more.

According to a sixth aspect of the present invention, there is provided a method for treating incinerated ash, comprising removing coarse incombustible materials having a large particle diameter from the granular material from which fine particles have been removed by the fine particle separation apparatus, and removing the remaining granular material, ie, coarse particles. A particulate material having a particle size smaller than that of the incombustible particles and having a predetermined particle size from which fine particles are separated is extracted, and carbon dioxide is brought into contact with the particulate material.

An aging facility according to a seventh aspect of the present invention includes a stage having a mounting plate having a large number of holes for mounting a granular material having a predetermined particle size or more extracted from incinerated ash, and a stage below the stage. And a gas supply pipe for supplying a gas containing carbon dioxide to the granular material,
A void layer is provided between the mounting plate and the gas supply pipe, and while giving an appropriate amount of moisture to the granular material, carbon dioxide is supplied through the void layer, and carbon dioxide is brought into contact with the granular material. It is what was constituted.

[0013] In the aging facility according to the present invention, the void layer is formed of large-grained sand and gravel.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a processing flow of an incineration ash processing system according to an embodiment of the present invention. This processing system performs attrition processing on incineration residues (hereinafter, referred to as incineration ash) of an incinerator. For separating fine particles containing a large amount of harmful substances such as heavy metals and dioxins from the finely divided incinerated ash to extract granular materials having a predetermined particle size or more, and to contact the granular materials with carbon dioxide. It is sent to an aging facility to perform insolubilization treatment of heavy metals, and the above granular material can be reused. In the figure, reference numeral 30 denotes a primary grinding treatment device, which is added to incinerated ash,
A compressive stress is applied to the granules in the incineration ash to separate the aggregated granules in which the granules adhere to each other into substantially independent granules without breaking the granules, and to refine the granules. At the same time, by applying the force of rubbing between the granules, mutual polishing is performed by friction between the granules, and harmful substances such as heavy metals and dioxins adhering to the surface of the granules are removed by the granules. Treatment to separate from the body surface (hereinafter,
This primary grinding apparatus 30 performs a grinding process mainly for grain refinement, as described later. Numeral 40 denotes a vibrating sieve, which has a particle size of 5 out of the slurry containing the granular material refined by the attrition treatment device 30.
Sort and separate coarse incombustible material of mm or more. Reference numeral 50 denotes a secondary grinding device that performs a crushing process and a deflocculing process of the granular material in the same manner as the primary grinding device 30. As described later, the secondary grinding device 50 includes: A grinding process is performed mainly on mutual polishing by friction between the granular materials.

Reference numeral 60 denotes a slurry having a particle size of 0.1 from the slurry containing the granular material refined by the secondary grinding apparatus 50.
A vibrating screen for classifying fine incombustible particles of 5 mm to 5 mm, 71 is a filter press for producing a dewatered cake from a slurry containing fine particles discharged from the vibrating screen 60, and 72 is a treated water of the filter press 71. A water purification device 80 for purifying is an aging facility for insolubilizing heavy metals in fine-grained incombustible materials having a particle size of 0.5 mm to 5 mm classified by the vibrating screen 60. Reference numeral 91 denotes a jet water device that supplies treated water to the vibrating sieve 40 as a jet stream, and reference numeral 92 denotes a jet water device that supplies treated water to the vibrating screen 60 as a jet stream. The treated water purified by the water purifying device 72 is used as treated water of the primary attrition treatment device 30 and is also used by the jet water devices 91 and 9.
2, the vibrating screen 40 and the vibrating screen 60
It is also used as treated water.

Next, a method of treating incinerated ash will be described. First, the incineration ash stored in the ash pit 10 of the incinerator is introduced into the attrition treatment device 30 via the receiving hopper 20. In addition, a classification net 21 of about 20 mm is provided at the input port of the receiving hopper 20, and large contaminants are captured and removed in advance. Primary grinding device 30
Then, while adding treated water to the granules, the granules in the incineration ash are rubbed with each other to make them finer, and at the same time, harmful substances such as heavy metals and dioxins attached to the surface of the granules are peeled off. Then, a grinding treatment for separating by floating or dissolving in the treated water is performed. Note that, as the treated water, treated water purified by a water purifying device 72 described later is used.

FIG. 2A is a view showing the structure of the primary grinding apparatus 30, and FIG. 2B is a sectional view taken along line AA. The primary attrition treatment device 30 is attached to the inner peripheral surface along the axial direction, and is attached to the cylindrical rotary drum 31 having a plurality of outer blades 31W protruding toward the center, and attached to the outer peripheral surface along the axial direction. , Having a plurality of inner blades 32W protruding in the radial direction,
A rotor 32 eccentrically mounted inside the rotary drum 31, an annular gear 33 provided on the outer circumference of the rotary drum 31 is driven by a motor 34, and a rotary shaft 35 mounted on the rotor 32 is driven by a drive mechanism 36. Driven by
The rotating drum 31 and the rotor 32 are rotated in directions opposite to each other, and a compressive and sliding stress is applied to the incineration ash, which is the processing material input from the material input port 37, so that the massive incineration ash is substantially independent. Separation into fine particles and fine-graining, and the above-mentioned fine-grained particles are mainly subjected to a rubbing force between the fine particles to cause mutual polishing by friction between the fine particles. In this method, harmful substances such as heavy metals and dioxin adhering to the surface of the granular material are separated by floating or dissolving in treated water. The secondary grinding device 50 provided at the subsequent stage of the vibrating sieve 40 has the same configuration as the primary grinding device 30 described above.

In the primary grinding apparatus 30 and the secondary grinding apparatus 50, the magnitude of the stress acting on the processing material is as follows:
It is adjusted mainly by the distance D between the rotary drum 31 and the rotor 32, which is determined by the diameter and the eccentricity of the rotor 32, and the relative rotation speed between the rotary drum 31 and the rotor 32 (see FIG. 2B). ). In the present embodiment, in the primary attrition treatment device 30, the distance D between the rotary drum 31 and the rotor 32 is relatively widened by reducing the diameter and the eccentricity of the rotor 32, so that the fine crushing of the incinerated ash is prevented. Grinding process mainly for liquefaction. In the secondary attrition treatment device 50, the distance D between the rotary drum 31 and the rotor 32 is reduced by increasing the diameter and the eccentricity of the rotor 32, and the relative rotation between the rotary drum 31 and the rotor 32 is increased. The grinding speed is set to be higher than that of the primary grinding device 30 to perform the grinding process mainly based on mutual polishing by friction between the granular materials.

The slurry containing the granular material ground by the primary grinding device 30 is sent to a vibrating sieve 40. In the vibrating sieve 40, while washing the granular material by jetting jet water from a jet water device 91 to the slurry containing the granular material, coarse incombustible material mainly composed of gravel and having a size of 5 to 20 mm is removed from the slurry. Extract and separate from harmful substances suspended or dissolved in it. In addition,
In the vibrating sieve 40, first, the granular material is washed using the treated water purified by the water purification device 72, and then washed using newly supplied auxiliary water. The slurry containing the granular material having a particle size of 5 mm or less passing through the vibrating sieve 40 is sent to the secondary grinding device 50, and strongly adheres to the surface of the granular material that could not be separated by the primary grinding device 30. A grinding process is performed in which heavy metals are separated from the surface of the granular material and are suspended or dissolved in treated water, and the slurry containing the ground material that has been subjected to the grinding process is applied to the vibrating screen 60.
Send to In the vibrating screen 60, while jetting jet water from a jet water device 92 onto the slurry to wash the granular material, fine incombustible particles having a particle size of 0.5 mm to 5 mm float or dissolve in the slurry. Separate and extract from harmful substances. In the vibrating screen 60 as well, first, the granular material is washed using the treated water purified by the water purification device 72, and then washed using newly supplied auxiliary water.

The particle size extracted by the vibrating sieve 40 is 5
Since the harmful substances such as heavy metals and dioxins are removed from the coarse incombustible material having a diameter of mm to 20 mm, it can be reused as, for example, aggregate for concrete. However, fine incombustible particles having a particle size of 0.5 mm to 5 mm extracted by the vibrating screen 60 have a small particle size.
A large amount of water is adsorbed, and heavy metals may remain on the surface of each granular material, particularly on its concave portions. Accordingly, heavy metals may be eluted from the fine-grain incombustibles. Therefore, the heavy metals are sent to the aging facility 80 and subjected to insolubilization treatment described later. Further, the slurry containing a large amount of fine particles of harmful substances, which has passed through the vibrating screen 60, is sent to a filter press 71 to be subjected to a dewatering treatment, and a dewatered cake is prepared therefrom. Since this dehydrated cake contains a large amount of the above harmful substances, it is made harmless by, for example, melting and solidifying, and then is discarded at a waste disposal site. The water treated by the filter press 71 is purified and reused in the water purifying device 72 by, for example, subjecting heavy metals to insolubilization treatment with a chemical.

Next, the aging treatment of the fine-grained incombustible material will be described. FIG. 3A is a plan view showing an outline of a stock yard for fine incombustibles in which an aging facility 80 according to the present embodiment is installed. At the center of this stockyard, a stage 81 for stacking fine-grain incombustibles 80r is installed, and around the stage 81, a sprinkler for supplying appropriate moisture to the fine-grained incombustibles 80r. 82 are provided. The fine incombustible material 80r is shown in FIG.
As shown in (b), the stage is mounted on a mounting plate 83 made of an iron plate having a large number of holes and having a thickness of about 1 m, which constitutes the upper surface of the stage. At the bottom of the stage 81 and below the mounting plate 83, a gas supply pipe 85 having a number of openings 85s in the direction of the mounting plate 83 for supplying carbon dioxide, with a gap layer 84 made of gravel 84r therebetween. Are arranged. The carbon dioxide sent from the gas supply pipe 85 passes through the opening 85 s and gravel 84 in the void layer 84.
r, and is blown into the fine incombustibles 80r through many holes of the mounting plate 83. The fine incombustible material 80r is different from fly ash and fine particles separated by the vibrating screen 60, and is a granular material having a particle size of 0.5 mm to 5 mm.
Since the blown carbon dioxide can be brought into sufficient contact with the surface of the fine incombustibles 80r, elution of heavy metals can be efficiently prevented. Further, a void layer 84 made of sand and gravel 84r is provided so that
Since the air is uniformly blown to the mounting surface of 0r, it is possible to eliminate the variation in the progress speed of the chemical reaction depending on the location.

As described above, the fine incombustible material 80r is mounted on the stage 81, and the sprinkler 82 supplies water to such an extent that the surface of the fine incombustible material 80r is not dried.
The fine incombustible material 80r is brought into contact with carbon dioxide to reduce the alkalinity due to the neutralization reaction and promote a chemical reaction such as lead incorporation accompanying CaCO ₃ generation, thereby preventing elution of heavy metals in a short time. And it can be performed stably. The aging effect can be further promoted by stirring the fine incombustibles 80r several times a day using a wheel loader or the like.

FIG. 4 shows a sample of three kinds of fine particles (A, B, and C) having a particle diameter of 0.5 mm to less than 5 mm in which lead elution exceeding the environmental standard value was selected, and a lead elution test was performed. And the same sample as the above sample is wetted for 3 to 10
It is a figure which shows the result of having performed the lead elution test after performing the aging process of standing still for a week. As is clear from the figure,
The elution concentration of lead in the fine particles subjected to aging treatment is A, B,
In all samples of C, the environmental standard value of 0.01 mg
/ l, which is much lower than that of the conventional incineration ash, and it was confirmed that the elution of lead can be prevented in a shorter time than in the case where the entire incineration ash was left standing. FIG. 5 shows the fine granules (A,
FIG. 6B is a diagram showing the results of aging processing of B and C) by blowing air and carbon dioxide, respectively, in the aging facility 80 of the present embodiment. In the figure, □ is the initial value, ●
Is the lead elution test result after one day, and ▲ is the lead elution test result after three days. As is clear from the figure, whether the supplied gas is air or carbon dioxide is detected after aging treatment. The lead elution concentration that has already been
It was 0.001 mg / l or less, which was much lower than the detection reference value of 0.01 mg / l, and it was confirmed that lead was insolubilized in a very short time.

As described above, according to the present embodiment, the incinerated ash is introduced into the attrition treatment devices 30 and 50 to add water thereto, and to apply the force of rubbing between the granular materials, thereby forming the above granular materials. After refinement, after separating fine particles containing a lot of harmful substances such as heavy metals and dioxins from the surface of the granular material,
The fine incombustibles in the incineration ash are extracted by the vibrating screen 60, supplied to the aging facility 80, and supplied with carbon dioxide while giving an appropriate amount of water to the granules, and the granules are brought into contact with carbon dioxide. As a result, heavy metals can be prevented from being eluted in a short period of time and stably, and a reusable granular material can be obtained. In other words, the fine-grained incombustible material to be aged is that most of fine particles containing many harmful substances such as heavy metals and dioxins have already been separated from the surface of the granular material, and fly ash and pulverized incinerated ash Unlike the granular material having a particle size of 0.5 mm to 5 mm, the contact between the injected carbon dioxide and the fine incombustible material 80r is good, and the reaction is easily promoted.
The elution of heavy metals can be reliably prevented, and the aging time can be significantly reduced. Therefore, the amount of incinerated ash to be discarded can be significantly reduced, and the granular material composed of the coarse incombustible material and the fine incombustible material classified in advance by the vibration sieve can be reused as, for example, aggregate for concrete. .

In the above embodiment, the vibration sieve 4
Although fine incombustibles having a particle size of 0.5 mm to 5 mm to be subjected to aging were extracted by using 0 and the vibrating screen 60, fine incombustibles may be extracted by another method. For example, a fine particle separation device such as a liquid cyclone provided with a liquid supply tank is provided, and the slurry from the secondary grinding treatment device 50 is sent to the fine particle separation device via the liquid supply tank, for example, about 75 μm Alternatively, the fine particles having a particle size of less than 50 μm and the fine particles of the harmful substance separated in the attrition treatment devices 30 and 50 and floating in the treated water are separated from the fine particles. May be supplied to a classification means such as a vibrating screen or a vibrating screen to extract fine-grained incombustibles. As a result, harmful substances such as heavy metals can be separated more reliably.
At 0, the insolubilization treatment of fine-grained incombustibles becomes easy, the aging treatment can be performed more stably, and the treatment time can be further shortened. In the above example,
The incineration ash was pulverized and peptized using two grinding units. However, even with one grinding unit, there is no problem in practical use. And harmful substances such as dioxin can be sufficiently removed.

[0026]

As described above, according to the first aspect of the present invention, a granular material having a predetermined particle size or more is extracted from incinerated ash, and the granular material is exposed to the atmosphere while giving an appropriate amount of moisture. Since it is allowed to stand still, the reaction with carbon dioxide in the air is easily promoted, and the incineration ash can be efficiently and stably aged. Further, since the above-mentioned granular material has been subjected to the insolubilization treatment of heavy metals, it can be reused, and thereby, the amount of incinerated ash to be discarded can be significantly reduced.

According to the second aspect of the present invention, a gas containing carbon dioxide is supplied while giving an appropriate amount of water to the granules, and carbon dioxide is brought into contact with the granules. The processing time can be significantly reduced as compared with the case where the apparatus is left still.

According to the third aspect of the present invention, the fine particles in the incinerated ash are subjected to a grinding process in which the particles are rubbed together under water to make them fine. Since the particles are supplied to the classification step to extract the particles having a predetermined particle size or more, harmful substances such as heavy metals and dioxins adhered to the surface of the particles of the incinerated ash can be separated in advance. Therefore, aging becomes easy, and the insolubilization treatment of heavy metals can be performed efficiently and reliably.

According to the fourth aspect of the present invention, the granules finely divided in the grinding step are supplied to a classification step,
After classifying and extracting coarse incombustibles having a large particle diameter, the remaining granular material from which the coarse incombustibles have been removed is supplied to a fine particle separator, so that the particle diameter is smaller than that of the coarse incombustibles.
Since the granular material having a predetermined particle size or more in which the fine particles are separated is extracted and only this granular material is aged,
Processing efficiency can be further improved.

According to the fifth aspect of the present invention, the fine particles refined in the grinding step are supplied to a fine particle separation device to separate fine particles containing a large amount of harmful substances such as heavy metals and dioxins. However, since the fine particles having a predetermined particle size or more from which the fine particles are separated are extracted, the insolubilization treatment of heavy metals can be performed efficiently.

According to the sixth aspect of the present invention, coarse incombustibles having a large particle size are extracted and removed from the granular material from which fine particles have been removed by the fine particle separation device, and the remaining granular material, ie, Extracting a granular material having a particle size smaller than that of the coarse incombustible material and a predetermined particle size or more in which fine particles are separated, and aging only the granular material, further improving the processing efficiency. it can.

According to the present invention, a stage having a mounting plate having a large number of holes and a gas containing carbon dioxide disposed below the stage is supplied to the granular material. A gas supply pipe is provided, and a gap layer is provided between the mounting plate and the gas supply pipe, and while giving an appropriate amount of moisture to the granular material having a predetermined particle size or more extracted from the incineration ash, the gap layer is formed. Through the above, the carbon dioxide is brought into contact with the above-mentioned granules, so that the above-mentioned granules can be efficiently and uniformly contacted with the carbon dioxide, and the aging can be performed stably and the aging time is greatly reduced. Can be shortened.

According to the eighth aspect of the present invention, since the above-mentioned void layer is made of large-size sand and gravel, a diffusion path of carbon dioxide can be formed with a simple structure, and aging can be stably performed. It can be carried out.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an incineration ash processing apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a grinding processing apparatus according to the present embodiment.

FIG. 3 is a diagram showing a configuration of an aging facility according to the present embodiment.

FIG. 4 is a diagram showing an effect of preventing lead elution by an aging treatment.

FIG. 5 is a diagram showing the results of an aging promotion experiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Ash pit, 20 receiving hopper, 30 primary grinding apparatus, 40 vibrating sieve, 50 secondary grinding apparatus, 60 vibrating screen, 71 filter press, 7
2 water purification device, 80 aging facility, 80r fine-grain incombustible material, 81 stage, 82 water sprinkler, 83 mounting plate,
84 void layer, 84r gravel, 85 gas supply pipe, 85s
Openings, 91, 92 Jet water device.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hirohiko Shibata 2-1 Tsukudo-cho, Shinjuku-ku, Tokyo Kumagaya Gumi Tokyo head office (72) Inventor Tatsuji Maemura 2-1 Tsukudo-cho, Shinjuku-ku, Tokyo Stock (72) Inventor Shinta Yutaka 265 Sakurazawa, Yorii-cho, Osato-gun, Saitama Prefecture Inside Shinrokuseiki Co., Ltd. (72) Inventor Takao Rego 2-3-13-1 Shinjuku, Shinjuku-ku, Tokyo F-term (Ref.) 4D004 AA36 AB03 CA04 CA10 CA34 CB13 CC01 CC03 4D021 AA01 CA07 4D063 EE06 EE11 GA10 GC17 GC40 GD02 GD12 GD19 GD27

Claims (8)

[Claims] 1. A method for treating incinerated ash, wherein a granular material having a predetermined particle size or more is extracted from the incinerated ash, and the granular material is exposed to the atmosphere while giving an appropriate amount of moisture. 2. A method of extracting particulate matter having a predetermined particle size or more from incinerated ash, supplying a gas containing carbon dioxide while giving an appropriate amount of water to the particulate matter, and bringing the particulate matter into contact with carbon dioxide. A method for treating incinerated ash, characterized in that: 3. After passing through a grinding treatment step in which the granules in the incinerated ash are rubbed together under water to reduce the size, the finely divided granules are supplied to a classification step, 2. The method according to claim 1, wherein a granular material having a particle size or more is extracted.
Alternatively, the method for treating incinerated ash according to claim 2. 4. After separating coarse incombustibles having a large particle diameter from the finely divided granular bodies, the remaining granular bodies from which the coarse incombustible substances have been removed are supplied to a classifying step to be subjected to a predetermined process. 4. The method for treating incinerated ash according to claim 3, wherein a granular material having a particle size or more is extracted. 5. The method according to claim 1, wherein said finely divided granular material is supplied to a fine particle separating device, and fine particles are separated to extract a granular material having a predetermined particle size or more. 3. The method for treating incinerated ash according to 3. 6. A coarse particle incombustible material having a large particle size is removed from the granular material from which fine particles have been removed by a fine particle separation device, and the remaining granular material having a predetermined particle size or more is extracted. The method for treating incinerated ash according to claim 5, wherein the incineration ash is contacted. 7. A stage having a mounting plate having a large number of holes for mounting a granular material having a predetermined particle size or more extracted from incineration ash, and including carbon dioxide disposed below the stage. A gas supply pipe for supplying gas to the granular material, and a facility for performing an aging treatment of contacting carbon dioxide while giving an appropriate amount of moisture to the granular material, between the mounting plate and the gas supply pipe. An aging facility characterized by a gap layer. 8. The aging facility according to claim 7, wherein the void layer is made of large-grained gravel.