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Harmless treating method for waste tank lining of aluminium electrolytic bath

A harmless treatment, aluminum electrolytic cell technology, applied to the removal of solid waste, etc., can solve the problems of waste tank lining pollution, etc., to achieve the effect of cheap price, easy industrialization, and wide source

Active Publication Date: 2005-02-23
中铝郑州有色金属研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the deficiencies of the above prior art in the treatment of waste linings of aluminum electrolytic cells, and provides a waste aluminum electrolytic cell that makes the waste linings completely harmless, effectively solves the pollution problem of waste linings, and is easy for industrial implementation. Harmless disposal method of tank lining

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 970 grams of waste tank lining to the heat treatment raw materials in the form of particles smaller than 2 mm; add 1358 grams of limestone (1.4 times the waste tank lining) and add in the form of particles smaller than 2 mm; the amount of fly ash added is 242.5 grams (0.25 times of waste tank lining), add in the form of particles smaller than 1mm, mix the three materials evenly, and add them into the rotary kiln with a feeder. The bituminous coal is sprayed into the rotary kiln in the form of coal powder; the treatment temperature is controlled at 700°C, the treated material is rinsed with 10% lime water, and the flue gas is adsorbed by alumina. The soluble fluorine content in the final solid slag is 41.52 mg / l, the cyanide content is 0.037 mg / l, and the content of harmful substances in the solid slag and flue gas is lower than the national environmental protection allowable discharge standard.

Embodiment 2

[0022] Add 1210 grams of waste tank lining to the raw materials for heat treatment, and add it in the form of particles smaller than 2mm; add 1089 grams of limestone (0.9 times the waste tank lining), and add it in the form of particles smaller than 2mm; the amount of fly ash added is 484 grams (0.4 times of waste tank lining), add in the form of particles smaller than 1mm, mix the three materials evenly, and add them into the rotary kiln with a feeder. The bituminous coal is sprayed into the rotary kiln in the form of coal powder; the treatment temperature is controlled at 900°C, the treated material is rinsed with 15% lime water, and the flue gas is adsorbed by alumina. The soluble fluorine content in the final solid slag is 23.71 mg / l, the cyanide content is 0.029 mg / l, and the content of harmful substances in the solid slag and flue gas is lower than the national environmental protection allowable discharge standard.

Embodiment 3

[0024] Add 675 grams of waste tank lining in the heat treatment raw materials, add in the form of particles less than 2mm; add 742.5 grams of limestone (1.1 times the waste tank lining), add in the form of particles less than 2mm; the amount of sand added is 135 grams (waste 0.2 times that of the tank lining), added in the form of particles smaller than 1mm, mixed the three materials evenly, and fed them into the rotary kiln with a feeder. The bituminous coal is sprayed into the rotary kiln in the form of coal powder; the heat treatment temperature is controlled at 850°C, the material after heat treatment is rinsed with 20% lime water, and the flue gas is adsorbed by alumina. The soluble fluorine content in the final solid slag is 29.22 mg / l, the cyanide content is 0.052 mg / l, and the content of harmful substances in the solid slag and flue gas is lower than the national environmental protection allowable discharge standard.

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Abstract

A process for innocuously treating the used liner of aluminium electrolyzer includes such steps as proportionaly mixing it with the calcium oxide contained ore, SiO2 contained material and bitumite, heat treating in rotary kiln, adsorbing tail gas by alumina, and leaching the treated material by lime milk for secondary reaction. It can greatly decrease the contents of fluoride and cyanide in the treated dregs, which can be used to prepare cement or refractory or for building road.

Description

technical field [0001] A harmless treatment method for waste linings of aluminum electrolytic cells, which relates to waste linings of electrolytic cells in the process of electrolytic production of metal aluminum, especially all waste linings including waste cathode carbon blocks and waste refractory materials Harmless disposal method. Background technique [0002] The waste tank lining produced in the production process of electrolytic aluminum contains a large amount of soluble fluoride and cyanide, which is directly stacked in the open air and pollutes the atmosphere, and is mixed with rainwater into rivers to pollute surface water sources; landfill treatment also pollutes the soil, and infiltrates into underground pollution with rainwater Groundwater seriously endangers human health and causes great harm to the growth of animals and plants. The pollution of waste tank linings has become one of the important issues affecting the comprehensive, coordinated and sustainabl...

Claims

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Application Information

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IPC IPC(8): B09B3/00C25C3/08
Inventor 李旺兴陈喜平刘凤琴罗钟生赵淋
Owner 中铝郑州有色金属研究院有限公司
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