JP2002293574A - Method of manufacturing inorganic fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inorganic fiber and a method of manufacturing the inorganic fiber having high strength, a main raw material of which is ash of incinerated refuse. SOLUTION: The method of manufacturing inorganic fiber is characterized in that using the molten slag of incinerated ash as the saw material, the molten slag is stirred and separated into a metal ingredient and a slag ingredient by pouring the molten slag into a preserving furnace provided with an induction heating and stirring device, and the slag is made to flow down from the preserving furnace so as to be made into the fiber while controlling the ingredient of the slag.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inorganic fiber and a method for producing the same, and more particularly, to a method for producing an inorganic fiber using waste incineration ash as a main raw material.

[0002]

2. Description of the Related Art As is well known, refuse discharged from factories and homes is increasing at an accelerating rate, and reducing the volume of refuse is an urgent issue. Incineration is most effective for volume reduction, but incineration ash is generated as a result. Since the incinerated ash is light and easily scattered, it does not remain in the landfill, and recently, the incinerated ash has once been vitrified. Eventually, a system for vitrifying and using incinerated ash is being established. The problem is how to use the molten incineration ash (slag). At present, some are used as roadbed materials, tiles and aggregates, and as a high value-added commercial material, fiberization and use as rock wool (Japanese Unexamined Patent Publication No. Hei 10-273332) have been attempted. Rock wool is far from practical. The reason for this is that slag must be melted once again during fiberization, and the melting cost is high. Metal aluminum in slag,
This is because metal components such as iron remain and the strength of the fiber is weak.

[0003]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above problems, and is a novel method capable of forming a molten incinerated ash into a fiber without leaving a metal component in the molten incinerated ash. Is to be provided.

[0004]

Means for Solving the Problems The present inventor has made intensive studies in view of the above problems, and has found that the following means can solve the problems. That is,

1. When producing inorganic fibers using refuse incineration ash that has been melted and converted into slag, the molten slag is injected into a holding furnace equipped with an induction heating stirrer to stir and separate metal components and slag components. At the same time, adjust the components of the slag,
A method for producing inorganic fibers, wherein the slag is flowed down from the holding furnace and fiberized.

2. The incinerated ash is mixed with a thermite exothermic reactant during the melting of the incinerated ash.
3. The method for producing an inorganic fiber according to item 1.

3. The above-mentioned thermite exothermic reactant is obtained by mixing a particulate material containing an aluminum component and a particulate material containing an iron oxide component as essential components, and the content of the aluminum component in the reactant. Is 5% or more, and the ratio of the aluminum component to the iron oxide component is 1: (2.0 to 5.0), and is mixed at a ratio of 5 to 40% with respect to the incinerated ash. The method for producing an inorganic fiber according to claim 2.

4. The method for producing an inorganic fiber according to claim 3, wherein the mixture of the granules is granulated or granulated.

5. The method according to claim 3, wherein the mixture of the granules is divided into small portions, placed in a bag, and mixed with the incineration ash.
3. The method for producing an inorganic fiber according to item 1.

6. The method for producing inorganic fibers according to claim 3, wherein the mixture of the powder and granules is divided into small portions, put into capsules, and mixed with incineration ash.

7. The method for producing an inorganic fiber according to claim 3, wherein the granular material containing the aluminum component is a pulverized product of a waste aluminum can.

8. The method for producing an inorganic fiber according to claim 3, wherein the particulate material containing an aluminum component is aluminum residual ash.

9. The method for producing an inorganic fiber according to claim 3, wherein the material containing the iron oxide component is magnetic iron oxide sludge.

10. The method for producing an inorganic fiber according to claim 3, wherein the material containing the iron oxide component is red mud during the production of alumina hydroxide.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Slag melted in an incineration ash melting furnace is vitreous, so it is inherently insulative in a solid state and cannot be subjected to induction heating. Becomes possible. By the induction heating, the molten slag is vigorously stirred, and the newly added oxide component for component adjustment dissolves uniformly in a short time. Further, metal components such as iron and aluminum remain in a molten state in the molten slag of the incinerated ash, but these are agglomerated by stirring accompanying induction heating, eluted from the slag, and settled and separated. The induction heating furnace can be used arbitrarily from a low frequency to a high frequency without being limited to a frequency.

As the incineration ash melting furnace, any existing melting furnace such as an arc furnace or a surface melting furnace using burner heating can be used, but for the purpose of the present invention, a surface melting furnace using burner heating is used. Is most preferred.

When the incineration ash is mixed with a thermite exothermic reactant and melted, carbon, sulfur and metallic aluminum components remaining in the incineration ash can be removed. At this time, any existing incineration ash melting furnace can be used as the melting furnace, but a surface melting furnace using burner heating is most preferable. The thermite exothermic reactant of the present invention has an auxiliary effect as a heat source for melting incineration ash, but the greatest effect is the effect brought about by the mixing and disturbing action of incineration ash. That is,
Thermite exothermic reactant mixed with the incineration ash has a strong high-temperature explosive action during the reaction, which violently disturbs the incineration ash, frequently causes the lower layer and the upper layer to be exchanged, and the residual carbon, sulfur, Aluminum and the like are always exposed to the heating atmosphere. The residual carbon and sulfur are oxidized and burned off by heating. The residual aluminum is also oxidized and changes to aluminum oxide. According to the method of the present invention, residual carbon, sulfur,
Aluminum can both be reduced to 0.3% or less.

Further, Na represented by the chemical formula of R ₂ O
_{2 O,} K 2 _O is then dispersed gas by high temperature reaction of the thermite exothermic agent, the total amount can be reduced to 5% or less.

In the holding furnace, SiO2, CaO, M2 is used to improve the viscosity, fire resistance, and material properties of the slag after solidification.
The components are adjusted by adding gO, MnO, TiO2, Fe2O3 and the like. In addition, in the holding furnace, since the slag is vigorously heated and stirred by induction, unseparated metal components such as molten iron are centrifuged due to a difference in specific gravity from the slag and aggregate and sediment.

The inorganic fiber produced by the method of the present invention generally has the following composition range. Al2O3: 20~35 SiO2: 15~40 Fe2O3: 5~20 CaO: 20~45 MgO: 3~20 R 2 O: 5% or less MnO: 3~15 Fe: 0.3% or less C: 0.3% S: 0.3% or less Al: 0.3% or less Other unavoidable components + R ₂ O: 10% or less

In the present invention, since the thermite exothermic reactant is used, the alumina content generated by the thermite exothermic reaction is usually added to the alumina content contained in the incineration ash. Although ordinary incineration ash contains about 10% of alumina, in the present invention, it is better to add a thermite exothermic reactant so that the amount obtained by adding the added amount due to the thermite exothermic reaction becomes 20% or more. If the amount of alumina after melting is less than 20%, the amount of thermite exothermic reactant to be added becomes small, so that a sufficient disruption effect of the incinerated ash cannot be expected. At least 20% or more is required for sufficient disruption. On the other hand, if it exceeds the upper limit (35%), the viscosity of the molten incinerated ash becomes large, making it difficult to form fibers. If the content of SiO2 is less than the lower limit, sufficient heat resistance cannot be obtained. If it exceeds the upper limit, the viscosity becomes large and fiberization becomes difficult. CaO, MgO and MnO are necessary for lowering the viscosity of the molten glass, and if it is less than the lower limit, the viscosity cannot be sufficiently lowered. Addition exceeding the upper limit is not preferred because it causes a decrease in heat resistance. Fe2O3 is preferably in the above range in terms of fiber strength. R ₂ O is preferably at most 5%. If the upper limit is exceeded, the heat resistance will be reduced and the fibers will be brittle. F
e, C, S, and Al are all preferably 0.3% or less. Exceeding the upper limit is not preferable because the fiber breaks.

In the present invention, since molten iron is generated by thermite exothermic reaction, the molten glass is temporarily stored in a pool provided in a melting furnace, and the iron is sunk down and separated.
It is better to stir and separate the remaining iron that could not be separated here in a holding furnace.

The fiberization of glass is performed by flowing molten glass from a holding furnace and blowing it off with a high-speed rotating body utilizing centrifugal force. Alternatively, the fibers are blown off with compressed air to form fibers. Alternatively, the fibers are formed by a method using both of them.

The mixing ratio of the thermite reactant is 3-30.
% Is preferred. This is for the following reasons.
That is, the thermite reaction involves a violent disturbance and heat generation during the reaction, but when the reaction is weak, it stays only on the surface and does not propagate to the bottom. In order to disturb the incineration ash by the disturbing action and replace the incineration ash on the surface and the bottom, and to infiltrate the reaction heat to the bottom to form a deep pool, it is necessary to mix the incineration ash to a certain degree or more, at least 3%
It is necessary to mix above. 30% for the upper limit
The degree is preferred. Mixing more than the upper limit increases the viscosity of the molten incinerated ash, which is not preferable.

The thermite exothermic reactant comprises a mixture of a raw material containing an aluminum component and a raw material containing an iron oxide component. Examples of the raw material containing an aluminum component include waste aluminum cans for beverages and waste containing an aluminum component such as residual aluminum ash generated when aluminum metal is redissolved, but are not limited thereto. Raw materials containing iron oxide components are iron scrap,
Common metal waste such as iron rust, dust collection ash such as converter dust and blast furnace dust generated in the steel industry, iron oxide sludge generated as a by-product during the production of magnetic iron oxide, and aluminum hydroxide from bauxite Red mud during production is effective, but is not limited thereto. These raw materials may be used as a single type,
Alternatively, two or more kinds of starting materials different from each other may be appropriately mixed and used.

As described above, when the aluminum-containing raw material is a pulverized piece of an aluminum can, a mixture obtained by mixing with the iron oxide-containing raw material is pressed into a plate shape, divided into appropriate sizes and divided into incinerated ash. They may be mixed and dispersed. The thickness of the crimping piece is preferably about 3 to 6 mm and the length is about 5 to 30. Adhesive components remain on the pressure-bonded pieces from which the water in the aluminum can is evaporated, and moderate strength is exhibited. The size of the crushed piece of the waste aluminum can may be such that the crushed piece is crushed into small pieces of about 5 to 10 mm by a cutter and then secondarily crushed to 1 to 3 mm or less. When iron oxide sludge by-produced during the production of magnetic iron oxide is used as the iron oxide-containing raw material, the moisture content may be dried to about 5 to 1% by sun drying or the like. In order to further improve the mixing with the aluminum raw material, the lump is preferably finely pulverized.

The aluminum content in the thermite reaction composition containing the aluminum-containing raw material and the iron oxide-containing raw material as the main raw materials is preferably 5% or more. If it is less than 5%, thermite exothermic reaction does not occur, which is not preferable. The mixing ratio of aluminum and iron oxide is preferably such that the aluminum content is 1 and the iron oxide content is 2.5 to 6, and the mixture contains 3 to 12% by weight of titanium oxide and 1 to 3% by weight of manganese oxide. It is preferable to include them. When titanium oxide and manganese oxide are already contained in the aluminum raw material and the iron oxide raw material, after mixing the aluminum raw material and the oxidized raw material, the shortage of titanium oxide and manganese oxide may be newly added. Regarding the method of adding titanium oxide and manganese oxide, titanium oxide and manganese oxide may be added, or titanium oxide and manganese oxide may be added.
A material containing a manganese oxide component may be added. It is also effective to add waste particles containing titanium oxide and manganese oxide.

If the ratio of the aluminum-containing raw material to the iron oxide-containing raw material exceeds the upper limit, the amount of iron oxide becomes excessive and thermit exothermic reaction does not occur, which is not preferable. On the other hand, if it is less than the lower limit, the amount of aluminum is excessive, which is not preferable.

If the titanium oxide content is less than the lower limit, the viscosity of the thermite reaction product is so high that the meltability deteriorates and continuous operation is not possible. Further, even if the content exceeds the upper limit, no further improvement in the meltability can be expected.

Although there is no problem in practical use even if the thermite is in the form of a powder, it is more preferable to form it into granules or granules. When granules and granules are formed, the density of the granules is higher than that of the granules, so that the propagation speed of combustion heat is high and a higher heat generation effect can be obtained.

When the thermite exothermic reactant is mixed with the incinerated ash, the thermite exothermic reactant may be divided into small portions and placed in a bag of resin or the like or in a combustible capsule and mixed with the incinerated ash.

Most preferably, the flame is adjusted to an oxidizing flame and melted. As the melting furnace, any furnace having a structure capable of flame heating can be used, but a surface melting furnace having an inclined hearth is most preferable. FIG. 1 is an explanatory diagram of a surface melting furnace having an inclined hearth, a holding furnace, and a spinner rotating at high speed. In FIG. 1, the incinerated ash is pushed by a pusher 2 to the top of the inclined hearth 3 in the furnace. The incinerated ash pushed into the furnace pushes the previously put incinerated ash from behind, and pushes the previously put incinerated ash down the slope of the hearth down. A burner 4 opens in the furnace ceiling toward the inclined hearth, and the flame heats the incineration ash placed on the hearth surface. The incinerated ash is heated by the burner flame while flowing down the slope of the hearth, melts and melts, flows as slag, and accumulates in the pool 5 provided at the lower end of the hearth. In the slag of the pool, the iron sinks below, where the slag and iron are separated.
The slag overflowing from the weir falls down and falls into the holding furnace 6. The holding furnace is an induction heating furnace, to which an oxide for component adjustment is added and melted in the molten slag. Induction heating is accompanied by induction stirring, and the residual metal (mainly molten iron) in the slag is separated by stirring, aggregates and sediments due to the difference in specific gravity from the slag.

The slag that has fallen downward from the holding furnace is blown off by the spinner 7 that rotates at a high speed, and is fiberized and solidified.

FIG. 2 is an explanatory view of a structure in which a holding furnace of an induction heating type is directly installed below a pool of a melting furnace and molten slag flows down from the furnace bottom of the holding furnace. Only a small amount of component adjustment is required, and the present invention can be applied to relatively uniform incineration ash in which iron is not mixed.

[0025]

The present invention will be described by way of examples. Example 1 Inorganic fibers were produced using the surface melting furnace, holding furnace, and spinner of FIG. The incineration ash was mixed with a thermite reactant having the following composition and melted with an oxidizing flame. Composition of thermite reactant Aluminum raw material: As the aluminum raw material, a material obtained by pulverizing aluminum ash generated when aluminum metal was redissolved was used. Iron oxide component: The iron oxide component used was red mud when aluminum hydroxide was produced from bauxite. Pulverized waste of titanium oxide and manganese oxide was used as an auxiliary material.

The above aluminum raw material, iron oxide raw material, and auxiliary raw material were mixed and prepared into the following composition (% by weight). Aluminum component: 18% Iron oxide component: 40% Titanium oxide: 5% Manganese oxide: 2% 150 g of the above mixture was put into a polyethylene bag,
This was supplied from a hopper and mixed with 10% by weight of incinerated ash.

The burner fuel uses kerosene, 1300 ° C.
Melted in an oxidizing flame. Melt incineration ash and thermite produced slag with a low melting point and were extremely excellent in meltability. The slag was poured into a holding furnace after the iron content was removed with a water pool.

A slag is heated and held at 1500 ° C. using a high-frequency melting furnace as a holding furnace, and CaO, MnO, TiO
2. Add SiO2 to adjust the components, hold for 30 minutes, stir and separate the remaining iron, then drop it on a spinner,
Made fiber.

Result Residual aluminum, carbon, sulfur, iron in fiber Residual aluminum: 0.0% Carbon, sulfur: 0.1%> Iron: 0.0%

[0030]

As has been described in detail above, the present invention is one in which garbage incineration ash can be used as a main raw material and can be directly fiberized from a melting furnace for incineration ash, which greatly contributes to the effective use of incineration ash. It is.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of the method of the present invention.

FIG. 2 is a view for explaining another embodiment of the holding furnace.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Incinerator 2 ... Pusher 3 ... Inclined hearth 4 ... Burner 5 ... Pool 6 ... Holding furnace 7 ... Spinner

Continuation of the front page (51) Int.Cl. ⁷ Identification code FI Theme coat II (reference) C03C 6/10 C22B 9/22 // C21C 5/52 B09B 3/00 303L C22B 7/04 ZAB 9/22 5/00 JF term (reference) 4D004 AA36 AB03 BA10 CA12 CA29 CB33 CC11 4G014 AB01 4G062 AA05 BB06 CC01 CC04 DA04 DA05 DB04 DB05 DC01 DD01 DE01 DF01 EA01 EA02 EA03 EB01 EB02 EB03 EC01 EC02 EC03 ED03 EF03 EF04 EF04 ED04 FF01 FG01 FH01 FJ01 FK01 FL01 GA01 GB01 GB02 GC01 GD01 GE01 HH01 HH03 HH05 HH07 HH09 HH10 HH11 HH12 HH13 HH15 HH17 HH20 JJ01 JJ02 JJ03 JJ05 JJ07 JJ10 KK10 KA12 BA14 BA12 BA14 BA12 BA12 BA14 BA10 BA12 BA12 BA12 CB03 CD00 CE01

Claims (10)

[Claims] 1. When producing inorganic fibers using refuse incineration ash that has been melted and converted into slag, the molten slag is injected into a holding furnace equipped with an induction heating stirrer to stir and separate metal components and slag components. At the same time, adjust the components of the slag,
A method for producing inorganic fibers, wherein the slag is flowed down from the holding furnace to form fibers. 2. The incinerated ash is mixed with a thermite exothermic reactant during the melting of the incinerated ash.
3. The method for producing an inorganic fiber according to item 1. 3. The above-mentioned thermite exothermic reactant is obtained by mixing a particulate material containing an aluminum component and a particulate material containing an iron oxide component as essential components, and the content of the aluminum component in the reactant. Is 5% or more, and the ratio of the aluminum component to the iron oxide component is 1: (2.0 to 5.0), and is mixed at a ratio of 5 to 40% with respect to the incinerated ash. The method for producing an inorganic fiber according to claim 2. 4. The method for producing an inorganic fiber according to claim 3, wherein the mixture of the granules is granulated or granulated. 5. The method according to claim 3, wherein the mixture of the granules is divided into small portions, placed in a bag, and mixed with the incineration ash.
3. The method for producing an inorganic fiber according to item 1. 6. The method for producing inorganic fibers according to claim 3, wherein the mixture of the granules is divided into small portions, placed in capsules, and mixed with incineration ash. 7. The method for producing an inorganic fiber according to claim 3, wherein the granular material containing the aluminum component is a pulverized product of a waste aluminum can. 8. The method for producing an inorganic fiber according to claim 3, wherein the particulate material containing an aluminum component is aluminum residual ash. 9. The method for producing an inorganic fiber according to claim 3, wherein the material containing the iron oxide component is magnetic iron oxide sludge. 10. The method for producing an inorganic fiber according to claim 3, wherein the material containing the iron oxide component is red mud during the production of alumina hydroxide.