Method for treating aluminum silicate solid waste in waste lining of aluminum electrolytic cell

Abstract

The invention provides a method for treating aluminum silicate solid waste in a waste lining of an aluminum electrolytic cell. The method comprises the steps that S1) the aluminum silicate solid wastein the waste lining of the aluminum electrolytic cell is crushed to obtain crushed aluminum silicate solid waste; S2) the crushed aluminum silicate solid waste and aluminum oxide are mixed to obtaina mixture, wherein the mass of the crushed aluminum silicate solid waste is 0.5% to 100% of the mass of the mixture; and S3) the mixture is added to the aluminum electrolytic cell for electrolysis toobtain an aluminum silicon alloy. Compared with the prior art, the method has the advantages that the aluminum silicate solid waste in the waste lining of the aluminum electrolytic cell directly serves as a raw material to be added in the aluminum electrolytic cell for electrolysis to produce the aluminum silicon alloy, the pollution problems of fluoride and cyanide are solved, the harmless treatment, the reduction treatment and the resource treatment of the waste lining of the aluminum electrolytic cell are realized, and the obtained aluminum silicon alloy is a high-value product; and furthermore, the treating method provided by the invention adopts the existing aluminum electrolytic tank, and the treating method is simple.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment, and in particular relates to a treatment method for aluminum and silicon solid waste in the waste inner lining of an aluminum electrolytic cell. Background technique [0002] Electrolyzer overhaul slag belongs to hazardous solid waste, which has been included in the "National Hazardous Waste List" by the Ministry of Environmental Protection and the National Development and Reform Commission. Although my country is a big country in the production of aluminum electrolysis, the overall level of the aluminum electrolysis industry still lags behind developed countries. The life of the electrolytic cell is short and it needs to be overhauled every three to five years. The overhaul slag contains about 0.2% cyanide salts and 40% fluoride salts. Both cyanide and fluorine are substances that cause great harm to the environment. [0003] According to statistics, every ton of electrolytic alum...

AI Technical Summary

Problems solved by technology

[0009] At present, only about 20% of electrolytic aluminum enterprises in the country have built harmless treatment facilities, which are only the refractory materials for overhaul slag. Foreign countries also mainly use storage technology, because the overhaul slag currently in the industry at home and abroad is harmless The chemical treatment technology is not perfect, and the treatment is extremely difficult, so it has not been promoted

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