Method for preparing foam ceramic self-insulation wall material by utilizing solid wastes

A technology for solid waste and wall materials, which is applied in the preparation of foam ceramic self-insulation wall materials and the field of preparation thereof, can solve the problems of complex harmless treatment process of chrome slag, low cost, difficulty in mass utilization and the like, and achieves thermal insulation. Outstanding thermal insulation effect, high porosity, and the effect of ensuring durability

Inactive Publication Date: 2013-11-20
HENAN COAL CHEM IND GROUP INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the problem that the harmless treatment process of chromium slag in the prior art is complex and difficult to use in large quantities, and to provide a foam ceramic light-weight wall materia

Method used

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  • Method for preparing foam ceramic self-insulation wall material by utilizing solid wastes

Examples

Experimental program
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Effect test

Embodiment 1

[0025] A foam ceramic self-insulating wall material, the wall material is composed of main materials and additives, the main materials are chromium slag, coal gangue, ceramic polishing waste slag, albite feldspar, and bentonite. The main ingredients are all passed through a 200 mesh sieve, and weighed according to the ratio of 31%: 20%: 20%: 25%: 4% by weight, and 19g of admixture is added to every 200g of main ingredients, mixed evenly, and then mixed under a pressure of 5MPa Press down to form and dry at 110°C. The admixture is a sintering agent and a foam stabilizer, expressed in weight ratio, and the two are composed in a ratio of 7:1.

[0026] Described sintering agent is frit, and the chemical composition of frit is: SiO 2 40%, Al 2 o 3 4%, Fe 2 o 3 1%, CaO 15%, MgO 1%, K 2 O and Na 2 Total O 5%, PbO 12%, ZnO 8%, B 2 o 3 11%, Li 2 O 3%; The foam stabilizer is tricalcium phosphate.

[0027] Firing according to the following temperature system: from room tem...

Embodiment 2

[0030] It is basically the same as Example 1, and the difference is that the major ingredients are chromium slag, coal gangue, ceramic polishing waste, albite, and bentonite according to the proportioning composition of 30%: 19%: 23%: 22%: 6%. Add 20g of admixture per 200g of main material.

[0031] Described sintering agent is frit, and the chemical composition of frit is: SiO 2 41%, Al 2 o 3 5%, Fe 2 o 3 2%, CaO 9%, MgO 2%, K 2 O and Na 2 Total O 6%, PbO 14%, ZnO 9%, B 2 o 3 10%, Li 2 O 2%.

[0032] Technical indicators of this product: water absorption rate 0.7%, density 850 kg / m 3 , compressive strength 8.2 MPa, thermal conductivity 0.15 W / (mK).

Embodiment 3

[0034]Basically the same as Example 1, the difference is that the major ingredients are chromium slag, coal gangue, ceramic polishing waste, albite, bentonite, and the proportioning composition of 25%:24%:25%:21%:5% , every 200g of the main material is added with 18g of admixture to obtain the mixture, which is fired at 1150°C, and the volume fraction of CO in the flame gas is 5%.

[0035] Described sintering agent is frit, and the chemical composition of frit is: SiO 2 42%, Al 2 o 3 6%, Fe 2 o 3 1.5%, CaO 7.5%, MgO 3%, K 2 O and Na 2 Total O 7%, PbO 12%, ZnO 10%, B 2 o 3 10%, Li 2 O 1%.

[0036] Technical indicators of the product: water absorption 0.82%, density 670 kg / m 3 , compressive strength 6.8 MPa, thermal conductivity 0.13W / (mK).

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Abstract

The invention relates to a method for preparing a foam ceramic self-insulation wall material by utilizing solid wastes. The wall material comprises a main material and an admixture. The main material is prepared from the following components in proportion: 25% to 35% of chromium slags, 19% to 27% of coal gangue, 20% to 26% of waste ceramic polishing residues, 17% to 25% of albite and 1% to 6% of bentonite. The method comprises the following steps of: adding 16 to 20g of the admixture into every 200g of the main material; evenly mixing and screening the mixture; putting the mixture into a die; molding the mixture in a pressing manner and drying; sintering the mixture under a strong reducing atmosphere at the temperature of 1120-1180 DEG C, thereby obtaining the foam ceramic self-insulation wall material. The carbon in the coal gangue can serve as a foaming agent or a reducing agent, so that hexavalent chromium is reduced into chromium sesquioxide at the high temperature and under the strong reducing atmosphere. Thus, the toxicity of the chromium slags is eliminated. The prepared foam ceramic self-insulation wall material is low in pyroconductivity, small in density and low in water absorption rate; the usage temperature can reach 900 DEG C. In addition, the foam ceramic self-insulation wall material is complete in fire resistance, high in strength and long in service life, and can be used for replacing the existing wall materials and flammable insulation materials. The wall material integrates protection and thermal insulation functions; an exterior wall insulating layer is not required. Thus, the construction cost is lowered.

Description

technical field [0001] The invention relates to a foam ceramic self-insulation wall material prepared by using chromium slag, coal gangue and other solid wastes, in particular to a foam ceramic self-insulation wall material prepared by using chromium slag, coal gangue and other solid wastes and its preparation method. Background technique [0002] Chromium slag is an industrial waste produced during the production of metallic chromium and chromium salts, which is harmful to humans. At present, more than 20 provinces and cities in China have discharged more than 4 million tons of chromium slag. Chromium slag is piled up in the open air, soaked by rain and snow, and the contained hexavalent chromium is dissolved and infiltrated into groundwater or into rivers and lakes, polluting the environment. The content of hexavalent chromium in the water in the seriously polluted zone can be as high as tens of milligrams per liter, which is several times higher than the standard for dr...

Claims

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Application Information

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IPC IPC(8): C04B38/00B09B3/00
Inventor 封鉴秋徐柳贾晓林张建平李素萍李壮谭伟曹国喜刘焦萍李宁张秀全李宗耀徐才华
Owner HENAN COAL CHEM IND GROUP INST
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