Method for recycling waste cell lining electrolyte material of aluminum electrolysis cell

Abstract

The invention relates to a method for recycling a waste cell lining electrolyte material in an aluminum electrolysis cell. The method comprises the following steps that an electrolyte recovery material in a waste cell lining generated in an aluminum electrolysis production process is screened out, a replaced anode scrap is separated from a thermal insulation material, the separated thermal insulation material is crushed into crushed material blocks, and the crushed material blocks are taken as a first priming coat to be made into an aggregate thermal insulation material to be added into the surface of an aluminum electrolysis anode, the electrolyte recovery material is taken as a second-layer thermal insulation material to be paved on the first-layer priming coat, the crushed material blocks are paved on the surface of the second-layer thermal insulation material as a third-layer thermal insulation material, and the electrolyte recovery material is paved on the third-layer thermal insulation material to be taken as a fourth-layer thermal insulation material to prepare an aluminum electrolysis cell thermal insulation material meeting the requirements of aluminum electrolysis production. According to the method, comprehensive utilization of the aluminum electrolysis waste cell lining electrolyte material can be realized, and the environmental protection problem caused by the aluminum electrolysis waste cell lining electrolyte material is solved.

Description

technical field [0001] The invention relates to the technical field of hazardous solid waste recovery and reuse, in particular to the comprehensive utilization technology of the lining electrolyte material of aluminum electrolysis waste tanks. Background technique [0002] During the production process of aluminum electrolysis, due to the penetration and corrosion of the lining of the electrolytic tank by the high-temperature electrolyte, the lining structure of the aluminum electrolytic tank is deformed and cracked, and the high-temperature aluminum liquid and electrolyte penetrate into the lining of the tank from these deformed and cracked cracks. As a result, the electrolytic cell cannot be produced normally, and waste cell lining will inevitably be produced when the cell is stopped for repair. [0003] The waste tank lining mainly includes waste cathode carbon blocks, waste refractory materials and recycled electrolyte materials, etc. At present, the carbon materials an...

AI Technical Summary

Problems solved by technology

At present, the carbon materials and refractory materials in waste tank linings can be reused as resources after sorting, crushing, and harmless treatment. The main chemical components of the remaining electrolyte recycling materials are alumina, silica and other valuable substances. At the same time, there are harmful substances containing fluorine. If they are not used effectively, they will not only threaten the ecological environment, but also waste resources.

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