Method for preparing prebaked anode by using aluminum electrolysis waste carbon cathode

Abstract

The invention discloses a method for preparing a prebaked anode by using an aluminum electrolysis waste carbon cathode. A lining carbon material of the aluminum electrolysis waste carbon cathode is separated out and roughly smashed; the roughly smashed carbon material with a particle size smaller than 70 mm is intermediately smashed to separate out a particle material with a particle size not bigger than 3 mm; an aluminum-electrolyzed residual anode or a waste anode roasted by an anode production line is roughly smashed to obtain a rough residue; the roughly smashed rough residue with a particle size smaller than 70 mm is intermediately smashed to separate out a fine residue with a particle size not bigger than 3 mm; rough coke, medium coke and fine coke of calcined petroleum coke, powder, primary residue, fine residue and a carbon material are mixed, are preheated to fed a kneading machine, and are added in liquid asphalt for kneading; kneaded paste is strongly cooled to feed a forming machine to obtain a formed carbon block for cooling; and finally, the formed carbon block is roasted and heated until the asphalt is converted to a coke to form a firm and uniform whole. The method can perform the harmless treatment and the resource recycling for the waste carbon cathode, and is simple in preparation process.

Description

technical field [0001] The invention relates to the technical field of reuse of waste carbon cathodes in aluminum electrolysis, in particular to a method for preparing aluminum electrolysis prebaked anodes by using waste carbon cathodes in aluminum electrolysis. Background technique [0002] The waste carbon cathode produced in the aluminum electrolysis production process contains carbon, sodium fluoride, cryolite, aluminum fluoride, calcium fluoride, alumina and other substances, of which the carbon content is about 60-80%, electrolyte (including fluoride salt and alumina) is about 20-40%, and cyanide is about 0.2%. Normally, an electrolytic aluminum plant with an output of 300,000 tons produces 3,000 tons of waste cathodes per year. If it is not handled properly, it is equivalent to discarding 600-1200 tons of electrolyte and 1800-2400 tons of energy material cathode carbon every year. At the same time, harmful fluoride and cyanide threaten the safety of the surrounding e...

AI Technical Summary

Problems solved by technology

Although this method can meet the requirements for anode preparation, the intermediate ash removal and drying operations require methods such as flotation, acid, alkali, and acid-base combined methods, which undoubtedly greatly increase the difficulty of the process and improve the production process. Cost, currently no industrial application

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