High-temperature resourceful disposal method of aluminum electrolytic waste tank lining

Abstract

The invention provides a high-temperature resourceful disposal method of an aluminum electrolytic waste tank lining, belongs to the technical field of comprehensive utilization of aluminum industrial solid waste resources. The method comprises the following steps: stacking three solid waste raw materials including waste cathode carbon blocks, waste silicon carbide side blocks and waste fireproof materials contained in the waste tank lining by adopting a one-step induction heating way through a certain manner; simultaneously, adding an appropriate amount of additives, decomposing cyanide at a high temperature in a disposal process, volatilizing the cyanide and absorbing the cyanide by an upper-layer covered material; cooling the materials after disposal and screening the materials to obtain high-graphite carbon blocks, silicon carbide particles and aluminum-silicon-calcium mixed materials; and separately using the high-graphite carbon blocks, the silicon carbide particles and the aluminum-silicon-calcium mixed materials as a recarburizer, a deoxidizing agent and refining slag in a steel-making refining process. The method disclosed by the invention has the advantages of being clean in process, simple in disposal device, and easy for utilization of the materials after disposal, and has better application prospects.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of solid waste resources in the aluminum industry, in particular to a high-temperature resource treatment method for aluminum electrolysis waste tank linings. Background technique [0002] The service life of large-scale aluminum electrolytic cells in my country is generally 2,000 to 3,000 days. When the electrolytic cell is overhauled, the lining of the cell will be replaced, and a large amount of discarded lining solid waste will be produced, including waste cathode carbon blocks and waste silicon carbide side blocks. and waste refractories. Since the above-mentioned solid waste contains high levels of fluoride and cyanide, it has been included in the "National Hazardous Waste List". If it is naturally piled up and in contact with humid air or rainwater, it will cause serious harm to the environment and the atmosphere. The electrolytic aluminum plant produces about 24-30kg of w...

AI Technical Summary

Problems solved by technology

This type of wet disposal process has poor economic efficiency, and the solid waste produced after the treatment of waste tank linings is still unusable and unable to meet environmental protection requirements. Therefore, two or three production lines that have been put into operation in China are currently out of production

[0006] In contrast, the treatment technology of waste aluminum electrolysis tank lining by fire method has greater development prospects, but it still faces two main problems, one is the collection of highly corrosive fluoride gases volatilized during the treatment process; the other is the treatment Utilization of waste tank lining

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