JP2000053461A - Production of structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a structure which has high sealing property for heavy metals and which can be used without causing environmental pollution by melting and mixing a compsn. containing each specified amt. of sulfur and an inorg. material containing heavy metals at a specified temp., and forming the mixture into a specified form. SOLUTION: A compsn. containing 5 to 95 wt.% of sulfur and 5 to 95 wt.% of an inorg. material containing heavy metals such as Pb, Cd, Hg, Se, As, hexavalent chromium is fused and mixed at 160 to 200 deg.C and formed into a specified form. The inorg. material containing heavy metals is, for example, incineration ash of municipal waste, incineration fly ash, fused fly ash discharged from a high temp. fusing furnace of municipal waste, coal ash discharged from a coal power plant facility, fluidized sand used in a fluidized bed incineration device, soil contaminated with heavy metals, abrasive chips, and by-products in the production of various kinds of metals such as steel slag dust, ferronickel slag, aluminum dross and copper slag.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a structure, and more particularly, to a reef, a wave breaking block, a roadbed material, a fine aggregate,
The present invention relates to a method for manufacturing a structure that can be effectively used as a material or a material for various uses such as civil engineering, construction or crafts, such as a caisson filling material or a molded article (such as a relief).

[0002]

2. Description of the Related Art Conventionally, inorganic materials containing a large amount of heavy metals (for example, lead, cadmium, mercury, selenium, arsenic, hexavalent chromium, etc.) are not disposed of as industrial waste without an appropriate treatment method. Was. However, in recent years, from the viewpoint of effective use of resources and reduction of waste, effective use of recycled resources, that is, recycling, has attracted attention and has been studied.
It has been pointed out that specific technologies need to be established. And for inorganic materials containing heavy metals,
Various methods for recycling by making a structure in which heavy metals are blocked have been studied. For example, a method of recycling by mixing an inorganic material containing a heavy metal and sulfur at a temperature of about 120 ° C. to 150 ° C. has been studied, but has not yet achieved a satisfactory heavy metal sealing property.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a structure capable of effectively utilizing an inorganic material containing a heavy metal as a raw material and producing a structure which can be used without environmental pollution. An object of the present invention is to provide a method for manufacturing a product.

[0004]

Means for Solving the Problems In order to achieve the above object, the present inventors have made intensive studies and found that an inorganic material containing a heavy metal is melt-mixed with sulfur at a specific high temperature at a specific high temperature. As a result, it has been found that a heavy metal is blocked, and a structure having a high heavy metal blocking property that can be used for applications such as civil engineering, architecture, and crafts can be manufactured, and the present invention has been completed.

That is, according to the present invention, 5-95
A composition comprising 5 to 95% by weight of one or more inorganic materials containing heavy metal and 160 to 200% by weight.
The present invention provides a method for producing a structure having a high heavy metal-sealing property, wherein the structure is melt-mixed at a temperature of ° C. and molded into a predetermined shape.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In the method for manufacturing a structure according to the present invention,
A composition containing sulfur and one or more inorganic materials containing a heavy metal is used.

[0007] The sulfur is not particularly limited, and includes, for example, ordinary sulfur alone and naturally produced or produced by desulfurization of petroleum or natural gas.

The above-mentioned inorganic material is an inorganic material containing a heavy metal, for example, municipal waste incineration ash / incineration fly ash, molten fly ash generated from a municipal waste high-temperature melting furnace, coal-fired power generation equipment. Coal ash discharged, fluidized sand used in fluidized bed incinerators, soil contaminated with heavy metals, grinding waste, by-products produced as by-products during the production of various metals, such as steel slag dust, ferronickel slag, aluminum dross, and copper Slag and the like. These can be used alone or in combination of two or more.

Although the heavy metal is not particularly limited,
Examples include various heavy metals, such as lead, cadmium, mercury, selenium, arsenic, hexavalent chromium, or mixtures thereof, where disposal of materials containing them can cause environmental pollution.

The compounding ratio of the sulfur in the composition is 5
The content of the inorganic material is 5 to 95% by weight, preferably 30 to 90% by weight. When the mixing ratio of the sulfur is less than 5% by weight or when the mixing ratio of the inorganic material is more than 95% by weight, the sulfur cannot sufficiently penetrate into the inorganic material, so that it can be molded as a structure. And cannot sufficiently block heavy metals.

The above composition contains inorganic oxides, clay minerals, activated carbon,
Secondary materials such as carbon fiber, glass fiber, sand, and gravel can be blended. The mixing ratio of these auxiliary materials is preferably 90% by weight or less based on the total composition.
In addition, the composition may contain, for example, a cyclic olefin-based hydrocarbon such as dichloropentadiene, cyclopentadiene, limonene, styrene, or the like as an additive in order to improve the heavy metal sequestering ability and the strength of sulfur.
The mixing ratio of these additives is preferably 10% by weight or less based on the total composition.

In the method of manufacturing a structure according to the present invention, the composition is melt-mixed at 160 to 200 ° C., preferably 165 to 180 ° C., and molded into a predetermined shape.

[0013] In the melt mixing, for example, sulfur
This can be performed by heating to 200 ° C., preferably 165 ° C. to 180 ° C. to melt, adding the inorganic material to the mixture and kneading the mixture to form the composition in a fluid state. As another method, after mixing solid sulfur with the inorganic material, the mixture is heated to 160 ° C to 200 ° C, preferably 165 ° C.
A method in which the composition is heated to a temperature of 180 to 180 ° C. and melted to obtain the composition in a fluidized state is also included.

When the temperature of sulfur exceeds 160 ° C., the sulfur bond of the eight-membered ring begins to be dissociated, and the sulfur transitions to a polymer state, so that the viscosity sharply decreases. On the other hand, the dissociated radical has a very high reactivity with the heavy metal compound, so that the reaction between the heavy metal compound and the sulfur in the inorganic material is promoted. As a result, heavy metals are converted into sulfides that are less eluted in water. As a result, the heavy metal sealing performance of the obtained structure is remarkably improved, and a structure having a high heavy metal sealing property can be obtained.

The molding can be carried out by pouring the composition in a melt-mixed state into a mold or the like having a desired shape and cooling the composition.

The composition for a structure of the present invention can be effectively used as materials or materials for various uses such as civil engineering, construction or crafts. Specifically, for example, it can be used for a fish reef, a wave-dissipating block, a roadbed material, a fine aggregate, a caisson filling material, or a molded article (such as a relief).

[0017]

According to the method of manufacturing a structure of the present invention, a heavy metal-containing inorganic material is melt-mixed with sulfur to block the heavy metal to form a structure. Therefore, the heavy metal-containing inorganic material is used as a raw material. A structure that can be used effectively and can be used without causing environmental pollution can be manufactured.

[0018]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited thereto.

[0019]

EXAMPLE 1 1200 grams of sulfur was heated to 170 ° C.
In a molten state, 800 g of municipal solid waste incineration fly ash, which was previously heated to 170 ° C., was added and kneaded to prepare a melt-mixed composition, which was poured into a brass formwork and vibrated. After natural cooling to room temperature, the mold was removed from the mold, and a molded article could be formed. Using this molded article as a sample, a dissolution test of No. 46 notified by the Environment Agency was carried out. The results are shown in Table 1. The elution amount of heavy metals was below the soil environmental standard.

[0020]

Comparative Example 1 1200 g of sulfur was heated to 150 ° C.
In a molten state, the temperature was raised to 150 ° C. in advance,
The same municipal solid waste incineration fly ash 800 used in Example 1
Gram is added and kneaded to prepare a melt-mixed composition, poured into a brass mold, allowed to cool naturally to room temperature while applying vibration, and then removed from the mold to create a molded article Was completed. The molded article was used as a sample to carry out a test by the Environment Agency Notification No. 46. The results are shown in Table 1. The elution amount of heavy metals could not meet the soil environmental standards.

[0021]

[Table 1]

[0022]

Comparative Example 2 40 g of sulfur was heated to 170 ° C. to be in a molten state, and 800 g of municipal incineration ash charcoal ash, which had been heated to 170 ° C. in advance, was kneaded to prepare a melt-blended composition. Then, poured this into a brass mold, cooled naturally to room temperature while applying vibration, and then removed from the mold, when the model was removed from the model, the model collapsed,
The structure could not be made.

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Masanari Akiyama 1-3-12 Nishi-Shimbashi, Minato-ku, Tokyo Japan Petroleum Corporation Development Department (72) Inventor Chuichi Yamashita 8 Chidoricho, Naka-ku, Yokohama-shi, Kanagawa Japan (72) Inventor Toshio Kawada 3-390 Koyasudori, Kanagawa-ku, Kanagawa-ku, Kanagawa Prefecture Nippon Oil Co., Ltd. − 304 (72) Inventor Takuya Yamato 5-12-4-306 Shiba, Minato-ku, Tokyo

Claims (1)

[Claims] A composition containing 5-95% by weight of sulfur and 5-95% by weight of one or more inorganic materials containing a heavy metal is melt-mixed at 160-200 ° C. A method for producing a structure having a high heavy metal sealing property, characterized by being formed into a shape.