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Method for producing insulating bricks by utilizing aluminum-electrolyzed waste refractory materials

A refractory, aluminum electrolysis technology, applied in ceramic molding machines, manufacturing tools, etc., can solve the problem of aluminum electrolysis waste refractory pollution and other problems, and achieve the effect of reducing emissions

Inactive Publication Date: 2011-05-18
YICHUAN LONGHAI TECH INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide an effective utilization method of aluminum electrolysis waste refractory materials, and take harmless treatment measures in the utilization process, effectively solve the pollution problem of aluminum electrolysis waste refractory materials, and realize the resource utilization of solid waste

Method used

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  • Method for producing insulating bricks by utilizing aluminum-electrolyzed waste refractory materials
  • Method for producing insulating bricks by utilizing aluminum-electrolyzed waste refractory materials

Examples

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Effect test

example 1

[0025] combine figure 1 1,020 kg of aluminum electrolytic waste refractory materials except carbonaceous materials and silicon carbide bricks are added to the raw materials for production, and added in the form of particles smaller than 2mm; 1,610 kg of fly ash are added; 987 kg of refractory clay are added, crushed to 40 mesh Sieve; add 139 kg of crushed lime; add 300 kg of pore-forming agent and 800 kg of water. The above materials are mixed with a forced mixer to ensure uniform mixing, and then extruded by a semi-dry method, and the formed insulation bricks are sent to the drying room in batches for drying. The drying gas is fired to discharge flue gas. It is adsorbed by alumina, and the firing temperature is controlled at 1000 ° C to 1260 ° C, and the temperature is kept for 2 to 4 hours. It is tested that the soluble fluoride content in the insulation brick is 17.6mg / l, the cyanide content is 0.021mg / l, and the content of harmful substances in the insulation brick and fl...

example 2

[0028] combine figure 1 680 kg of aluminum electrolytic waste refractory materials except carbonaceous materials and carbonized silicon bricks are added to the raw materials for production, and added in the form of particles smaller than 2mm; 967 kg of fly ash and fly ash floating beads are added; 623 kg of refractory clay is added kg, crushed through a 40-mesh sieve; add 103 kg of crushed lime; add 180 kg of pore-forming agent and 500 kg of water. The above materials are mixed with a forced mixer to ensure uniform mixing, and then extruded by a semi-dry method, and the formed insulation bricks are sent to the drying room in batches for drying. The drying gas is fired to discharge flue gas. It is adsorbed by alumina, and the firing temperature is controlled at 1000 ° C to 1260 ° C, and the temperature is kept for 2 to 4 hours. It is tested that the soluble fluoride content in the insulation brick is 15.4mg / l, the cyanide content is 0.019mg / l, and the content of harmful substa...

example 3

[0031] combine figure 1 1,130 kg of aluminum electrolytic waste refractory materials except carbonaceous materials and carbonized silicon bricks were added to the raw materials for production, and added in the form of particles smaller than 2mm; 1,962 kg of fly ash floating beads were added; 1,106 kg of refractory clay were added, crushed 40 mesh sieve; add 197 kg of crushed lime; add 900 kg of water. The above materials are mixed with a forced mixer to ensure uniform mixing, and then extruded by a semi-dry method, and the formed insulation bricks are sent to the drying room in batches for drying. The drying gas is fired to discharge flue gas. It is adsorbed by alumina, and the firing temperature is controlled at 1000 ° C to 1260 ° C, and the temperature is kept for 2 to 4 hours. It is tested that the soluble fluoride content in the insulation brick is 11.8mg / l, the cyanide content is 0.011mg / l, and the content of the insulation brick and the harmful substance in the flue gas...

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Abstract

The invention discloses a method for producing insulating bricks by utilizing aluminum-electrolyzed waste refractory materials, relating to a recovery technology of waste refractory materials during the aluminum electrolysis production, wherein the aluminum-electrolyzed waste refractory materials are mainly various refractory material mixture in which waste cathode carbon blocks and side silicon carbide are removed. The method adopts the following raw materials in percentage by weight: 5-30% of the aluminum-electrolyzed waste refractory materials, 10-50% of fly ash or fly ash drift beads, 15-30% of a cementing agent, 1-5% of additives, 3-8% of a pore-forming agent and 10-20% of water, and the method comprises the following steps of: preparing the raw materials, mixing the raw materials, extruding the mixture to mold, drying and sintering to produce the insulating bricks; and by utilizing innocuous treatment measures, the extraction contents of fluoride and cyanide of the produced insulating bricks are lower than 50mg / l and 1.0mg / l, the smoke gas is adsorbed by an aluminum oxide, and the solvable injurant and the smoke gas of the insulating bricks both meet the national environment protection emission standard; and the produced insulating bricks can be applied to the heat insulation of various pipelines and walls at a temperature lower than 1000 DEG C.

Description

technical field [0001] The invention relates to recycling technology of discarded refractory materials in the production process of aluminum electrolysis, in particular to a method for producing thermal insulation bricks from aluminum electrolysis waste refractory materials discharged during the overhaul process of aluminum electrolysis, excluding waste carbon materials. [0002] Background technique [0003] The solid waste discharged from the electrolytic aluminum plant is mainly the lining of the aluminum electrolysis waste tank, which is mainly composed of: cathode carbon block, insulation brick, refractory brick, refractory powder (dry anti-seepage material), refractory mortar and heat insulation board, etc. . The lining of the waste tank contains a large amount of soluble fluoride and cyanide, which is hazardous waste and is one of the main factors causing environmental pollution in electrolytic aluminum plants. And the amount of waste tank linings is relatively ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28B3/20C04B35/66
Inventor 任必军魏应伟王二体赵红军候飞瑞王智辉
Owner YICHUAN LONGHAI TECH INDAL
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