JPH0834661A - Processing method of slag of fused urban garbage and production of sintered compact using the processed material - Google Patents

Abstract

PURPOSE:To prepare a compsn. for a sintered compact by adding an aq. soln. of sodium phosphate to slag powder of fused urban garbage for the ageing reaction to seal aluminum ion, and to obtain a sintered compound by kneading the compsn. with plastic clay and a sintering controlling agent, molding, and firing. CONSTITUTION:To 100 pts.wt. of the slag powder of fused urban garbage containing metal aluminum and pulverized to <=0.5mm grains, 1-20 pts.wt. of 2-20% concn. aq. Soln. of sodium phosphate is added to obtain a wet uniform mixture. The mixture is aged for one hour or longer to prepare the compsn. for a sintering compact. Then 5-70 pts.wt. of the wet controlled material calculated as a dry weight and 30-50 pts.wt. of plastic clay and 45-65 pts.wt. of sintering controlling agent, in total 100 pts.wt., and a proper amt. of water are kneaded and extruded by a vacuum kneader, dried, and fired at 950-1250 deg.C to obtain the sintered. Since the material foams in the sintering process, a porous sintered body is obtd. which can be easily cut. Further, this method is effective for recycling of waste materials which is one of social problems.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating molten slag, which is incinerated and melted to reduce and detoxify municipal garbage, among industrial wastes which have recently received the most attention in terms of environmental destruction. The present invention relates to a method for producing a ceramic sintered body as a construction material using molten slag as a processed material as a main raw material.

[0002]

2. Description of the Related Art Among technologies for using industrial waste as a raw material for sintered bodies such as ceramics, in particular, those using incinerated ash of municipal waste and their molten slag as a main raw material are almost still known. Absent. Therefore, the present inventor has disclosed in Japanese Patent Application No.
In Japanese Patent No. 319185, a new technology for producing a ceramic sintered body using general municipal waste melting slag as a main raw material was proposed. In the course of further research, heating of a furnace for melting municipal waste incineration ash was proposed. It was found that the properties and components of the produced slag were different. In particular, the slag produced by the surface melting heating method is discharged in a state in which the metal aluminum mixed in the municipal garbage is not melted but is mixed in a granular form. Is separated by a sieve, but 3 to 5% of aluminum metal fine particles remain in the pulverized slag, and are mixed as a component. Such a raw material is a new raw material that has never existed as a ceramic raw material. Therefore, a technique for manufacturing a ceramic sintered body using this new raw material has not been known at all. Metal aluminum powder
A large amount of hydrogen is generated when exposed to an alkaline aqueous solution, and this chemical reaction is known as ALC foaming technology. However, this technique, in the production of ceramic sintered bodies, especially when a wet extrusion method is applied, the shape of the molded body becomes unstable due to the foaming phenomenon, significantly reducing the plasticity essential for extrusion molding. Therefore, there is a problem that it is extremely difficult to produce a stable ceramic sintered body.

[0003]

In addition to the above-mentioned prior art, there are the following problems. So far, a new technology for producing ceramics as a valuable construction material using wastes such as municipal waste molten slag as a main raw material has already been proposed by the present inventors as described above, but especially What is melted and discharged in the state where metallic aluminum is mixedly contained in slag is limited by the surface melting heating method, and further, its treatment is difficult, and it has not been solved in various places. Of course, in this regard, very little prior art is known. In other words, when a ceramic sintered body is manufactured using these slags, in the case of the dry powder molding method, almost no trouble occurs,
On the other hand, when wet molding is performed using a vacuum kneader from a kneaded state with a moisture content of 15%, a small amount of soluble alkali component in the raw material or in the water used reacts with aluminum to generate a large amount of bubbles. Therefore, there is a problem that the molding operation becomes extremely unstable. SUMMARY OF THE INVENTION The present invention is, in summary, one of the objects of the present invention to eliminate the problems in molding due to the residual metallic aluminum in the manufacturing process in which desired molding is performed using a vacuum clay kneader, and to solve the problems. Is.

In this regard, although incomplete, as a conventional technique, an attempt to prevent foaming failure due to metallic aluminum is made by adding an aqueous solution of slaked lime and causing a reaction according to the following chemical formula, as is known as an ALC production technique. 2A1 + 2Ca (OH) ₂ = 2Ca (A1O ₂ ) + 2H ₂ Thus, a method in which slag containing aluminum is previously treated with lime milk to generate hydrogen and then used as a raw material has some effects. However, in order to carry out these reactions completely, it is necessary to add Ca (OH) ₂ about three times or more to the weight of aluminum in the slag, which is disadvantageous in terms of productivity and economy. It is also an object of the present invention to solve this problem.

[0005]

The configuration of the present invention has the following features. The first feature is that, first, municipal garbage is heated to produce a melt, which is crushed to a particle size of 0.5 [mm] or less. It is a method of treating municipal garbage melting slag that forms no soluble complex on the surface of metallic aluminum, blocks aluminum ions, and is immobilized, thereby eliminating foaming obstacles due to moisture of metallic aluminum during molding. .

A second feature is that the sodium phosphate is sodium orthophosphate and / or condensed sodium phosphate, and that the condensed sodium phosphate also contains sodium tripolyphosphate. is there.

A third feature relates to a method for producing a sintered body using the municipal waste molten slag obtained by the first or second treatment method. 5 to 70 parts by weight of molten slag powder;
30 to 50 parts by weight of the plastic clay and 45 to 65 parts by weight of the sintering modifier are weighed to make a total of 100 parts by weight, mixed and kneaded by adding an appropriate amount of water, and then using a vacuum kneader. And extruded to form the desired shape, and after drying, 950 [° C]
The above is the method for producing a sintered body, which is fired at a temperature of 1250 [° C.] or less. Here, the plastic clay includes Kibushi clay and / or Frogme clay, and the sintering modifier includes glass cullet, wollastonite, porcelain cerven,
It is one or more flux-melting agents selected from fly ash, porcelain stone, feldspar, blast furnace slag and the like. Furthermore, the reason why the molten slag is set to 5 parts by weight or more in the total 100 parts by weight of the compounding is that if it is less than that, the effect of the present invention cannot be sufficiently obtained and it is uneconomical. The reason for this is that the plasticity becomes insufficient and the molding becomes difficult.

Next, if the amount of plastic clay is 30 parts by weight or more, if it is less than 50 parts by weight, the plasticity is insufficient, and if it is 50 parts by weight or less, the amount of dust that can be disposed is relatively small.
It is uneconomical. In short, the mixing ratio is determined by the balance between the viscosity of the liquid phase and the prevention of deformation. Therefore, if the sintering modifier is 45 parts by weight or more, if it is less than that, sintering becomes insufficient, and if it is 65 parts by weight or less, it is uneconomical because it is a material more expensive than waste. Because it becomes. Furthermore, the reason why the firing temperature is set to 950 [° C.] or higher is that sintering of the molded body is difficult if the firing temperature is lower than 950 [° C.]. This is because, when wollastonite is used, the fibrous crystals are broken, and it is not possible to expect an increase in the strength of the product.

[0009]

First, when an aqueous solution of sodium phosphate acts on the molten slag powder containing mixed aluminum metal particles, the surface of the aluminum metal particles becomes immobile. Therefore, thereafter, even if water acts on the immobilized aluminum particles, foaming due to hydrogen hardly occurs. Therefore, even if this wet material of the molten slag is used as a material for a desired molded product, the foaming of hydrogen causes No deformation obstacles occur.

Next, after adding a wet amount of the molten slag powder, a plasticizing clay, a sintering modifier such as wollastonite, and an appropriate amount of water, kneading the mixture, and then subjecting the mixture to a vacuum kneader, the aluminum particles can be converted into
Since the surface is immobilized, no hydrogen foaming action occurs. Furthermore, even when it is formed from the clay kneader and formed into a desired shape, there is no foaming effect due to hydrogen, so there is no deformation effect, and a molded article having a uniform shape can be obtained. Thus, when it is calcined, the volume of aluminum is oxidized and the volume of each particle expands, thereby reducing the weight of the product. Moreover, when wollastonite is used as a sintering modifier, the firing temperature is 1250.
When the temperature is lower than [° C.], the whey stone fibrous crystals have the effect of remaining and stored in the product structure, so that a lightweight and high-strength ceramic product can be obtained.

[0011]

EXAMPLES Examples of the present invention will be specifically described below.

(Embodiment 1) This embodiment is an example for comparing the effect of proper molding work when the waste molten slag is treated with an aqueous solution of sodium phosphate (the present invention) and when it is not treated (prior art). Is. 1) Raw material: slag particle size 0.5 [mm] or less, metallic aluminum content 6.5 [%] wollastonite particle size 60 mesh, wollastonite from China clay main Yamakibushi treatment agent second sodium phosphate 10 [%] aqueous solution 2) Mixing ratio: Slag 40 [%], wollastonite 20 [%], Motoyama Kibushi 40 [%] (weight ratio) 3) Slag treatment: Treatment agent 15 [%] relative to slag weight
And moisten it. 5 hours reaction curing 4) Adjustment of kneaded clay: After weighing in terms of dry weight according to the mixing ratio and mixing with a mixer for 10 minutes, water [10%] is added and mixed for further 5 minutes to obtain kneaded clay. 5) Forming: extrusion die size 100 using a vacuum kneader
Extrusion pressure 15 [kg] with a cross section of [mm] × 10 [mm]
/ Cm ² ] 6) Comparison of molding workability is shown in Table 1.

[0013]

[Table 1]

[0014] The untreated molded body foamed during drying and heating to generate a number of cracks, but the treated molded body showed no abnormality.

(Example 2) The intermediate compound of the present invention treated with sodium phosphate in Example 1 was prepared to have a length of 300 [mm] and a width of 10 [mm].
Molded as a plate-shaped body having a thickness of 0 [mm] and a thickness of 10 [mm],
It was dried to a moisture content of 1 [%] with a hot air drier at 200 [° C], but no foaming phenomenon was observed, indicating a drying shrinkage of 4 [%]. Further, the dried product was fired with a roller hearth kiln at 1100 [° C.]. In the firing process, the fired body expanded by 7% due to the oxidative expansion of aluminum, but became light and strong. Table 2 shows the physical properties of the sintered body.

[0016]

[Table 2]

As described above, the quality of the sintered body becomes a porous body, and the bending strength thereof is higher than that of a general porcelain tile. In addition to being lightweight, the cutting of the product has become extremely easy, and the latest high quality ceramic tiles for building materials have been created.

[0018]

【The invention's effect】

1) In the present invention, it has never been used for producing ceramics. The production of ceramic tiles for buildings has been made possible epoch-making by using raw materials mixed with metallic aluminum. 2) According to the present invention, since the special raw material contains metallic aluminum, it exhibits a unique foaming phenomenon in the molded body during the firing process, and becomes a porous product. In addition, despite being porous, it has become possible to produce a ceramic sintered body having a high strength and an easy-to-cut structure not seen in the past. 3) Since the raw material containing metallic aluminum is mainly molten slag generated in the waste incineration process, it meets the social theme of recycling waste, which is troubled in various places, and has a low cost. A remarkable effect has been obtained in that it has become possible to manufacture a product having an unprecedented value-added feature.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical display location B09B 3/00 304 A (72) Inventor Junichi Machida 1-23-5 Irumagawa, Sayama-shi, Saitama Sayama In the city hall

Claims (3)

[Claims] 1. 100 parts by weight of municipal solid waste slag powder which is melted by heating, contains metallic aluminum in a mixed state and is pulverized to a particle size of 0.5 [mm] or less.
A sodium phosphate solution having a concentration of 20 to 20 [%] in an amount of 10 to 2
After adding 0 parts by weight to obtain a wet homogeneous mixture, 1
A method for treating municipal solid waste slag, which comprises adjusting a composition for a sintered body by performing a curing reaction for a time or more. 2. The method according to claim 1, wherein the sodium phosphate is sodium orthophosphate and / or condensed sodium phosphate. 3. A dry material equivalent of 5 to 70 parts by weight of the wet slag powder of claim 1 or 2, 30 to 50 parts by weight of a plastic clay, and 45 to 65 parts by weight of a sintering modifier. And weighed to make a total of 100 parts by weight and mixed,
An appropriate amount of water for obtaining appropriate workability of the mixture is added and kneaded, and then extruded into a desired shape using a vacuum clay kneader, and after drying, 950 [° C] or more and 1250 [° C] ] The manufacturing method of the sintered compact using the municipal waste fusion slag characterized by baking at the temperature of the following ranges.