JP2002293659A - Method of manufacturing porous ceramic by using waste building material containing asbestos and incineration ash of sewage sludge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that asbestos-containing building materials and incineration ash of sewage sludge are left as they are since there is no effective treatment method or they are buried under the ground for reclamation. SOLUTION: Asbestos-absent porous ceramic to be reused is manufactured by mixing the waste of asbestos-containing building materials, incineration ash of sewage sludge, aggregate and the like and firing the mixture.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a highly recyclable water-permeable block made by asbestos-absent and reused by burning asbestos-containing building material waste and landfill-treated sewage sludge incineration ash. And a method for producing a porous ceramic.

[0002]

2. Description of the Related Art Asbestos-containing building materials, which are said to be harmful to health, such as chrysotile, have been used as roofing materials and wall materials for residential and non-residential buildings for more than 30 years. In recent years, building materials with reduced asbestos content are also being marketed, but the content is still not zero, and building materials with a high content used in the past are still used in houses and so on. Deterioration has caused problems related to asbestos, and no effective disposal method has been established for wastes in particular.

For example, as a method for treating asbestos building material waste, a process of burying it in soil as a large lump or melting and solidifying it at a high temperature and burying it in a stable final disposal site is performed.

On the other hand, sewage sludge incineration ash is mostly landfilled, and its reuse as a part of raw materials such as clay pipes and tiles or as a lightweight aggregate for various products has been studied. However, it has not yet been put to practical use and has not been effectively reused.

[0005]

Accordingly, asbestos-containing building materials and sewage sludge incineration ash have been left without any effective treatment method or landfilled.

[0006]

The waste of asbestos-containing building material, sewage sludge incineration ash, forming binder, aggregate, and the like are mixed and fired to reuse asbestos-free porous ceramic. To provide a manufacturing method.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The asbestos-containing building material used in the present invention is a hardened material such as cement hardened with asbestos and a hardened material such as calcium silicate mixed with asbestos. For example, flat colored slate, corrugated slate, slate, calcium asbestos silicate board, slag gypsum board, extruded cement board, ceramic siding, etc. In addition, although these are premised on waste of asbestos-containing roofing materials and wall materials mainly generated by replacement or rebuilding, naturally, waste materials are discarded without being used.

Since the asbestos-containing building material generated by replacement or rebuilding has already deteriorated, asbestos is liable to be scattered, and special attention must be paid to collection, transportation and storage.

[0009] Asbestos-containing building material waste is crushed and pulverized as necessary. There are various crushing and pulverizing methods, and they may be appropriately selected as needed.

[0010] The main components of the sewage sludge incineration ash used in the present invention are Si, Al, Fe, Ca, P, Mg, Na, and K, such as P, Ca, Na, and K, which easily form a glass phase. , And the reaction and firing proceed simultaneously at a relatively low temperature.

The molding binder used in the present invention is, for example, one or a combination of clay, bentonite, organic glue and the like, and can be easily molded by pressing or the like. Water glass can also be used, but in the case of water glass, it is cured by blowing carbon dioxide gas.

The aggregate used in the present invention is an inorganic material having a high fire resistance, such as seruben (waste of tiles, waste of ceramics, etc.), stone waste, silica sand, fly ash, chamotte, killer,
It is a combination of one or more of slag and the like.

Further, asbestos-containing building material waste and sewage sludge incineration ash mainly function as a molten binder. However, if the mixing amount of the fired material is increased, it is necessary to raise the firing temperature for forming a porous ceramic. Although an increase in fuel cost cannot be avoided, a lower firing temperature can be achieved by adding a melting aid.

The melting aid is a combination of one or more of frit, glaze sludge, glass waste, and the like.

In order to fire the above, the temperature is set to 600 ° C. or higher. This is because the asbestos peak is absent by X-ray diffraction when firing at 600 ° C. or higher.

The time required for firing is not particularly limited, but asbestos contained in building material waste is absent due to X-ray diffraction at the above firing temperature, and the time required for the molten binder to melt at the firing temperature and function as a binder. These are determined by the components of the molten binder to be mixed, the particle size, the size of the molded body, the conditions of the kiln, and the like. Examples of the firing method include a tunnel kiln and a roller house kiln.

Compared with the case where the asbestos-containing building material waste is pre-fired and then mixed and fired with sewage sludge incineration ash or aggregate, the shrinkage rate is increased when mixing and firing without pre-firing. This means that the porosity is increased, and the performance as a more porous material is exhibited.

As a cosmetic method of the porous ceramic, a glaze or a pigment is added at the time of mixing as it is, and the mixture is baked. There is a way.

Hereinafter, the present invention will be described specifically with reference to Examples, but the present invention is not limited to these Examples.

Example 1 Asbestos-containing building material waste (colonial (trade name), whose main composition is shown in Table 1) was crushed with a jaw crusher to 10 mm or less, then put into a ball mill and added with water for about 5 mm. The mixture was pulverized for an hour, and the obtained slurry was dried to obtain a dried powder. Table 2 shows the composition ratio of the used sewage sludge incineration ash. "MX-3P" manufactured by Ferro as a melting aid and clay (dried product,
80 mesh) and Cerven (7
２０20 mesh). The mixture was mixed at the mixing ratios shown in Table 3, kneaded and granulated while appropriately adding water, formed into a flat plate (50 g / sheet) by a press machine, and heated at 1050 ° C. in an electric furnace.
It was baked for 1 hour. The physical properties of the obtained plate material are as shown in Table 4, and it was found that the evaluation of the water-permeable block as an example of the porous ceramic was excellent. Also,
It was confirmed that the fired product did not show an asbestos peak by X-ray diffraction.

[Table 1]

[Table 2]

[Table 3]

[Table 4]

[0021]

According to the production method of the present invention, landfill-treated sewage sludge incineration ash, which can be reused as a porous ceramic in which asbestos waste which is said to be harmful to health is absent, Can be mixed, reacted, and fired with glass waste material, and can be reused as a porous ceramic with a high recycling rate and no asbestos.If the mixing rate of asbestos-containing building material waste is increased, the firing temperature must be increased. However, by adding a melting aid, the sintering temperature can be lowered, and the characteristics and effects such as the reduction of fuel cost can be obtained.

Claims (1)

[Claims] 1. A method for producing a porous ceramic, comprising mainly burning asbestos-containing building material waste and sewage sludge incineration ash.