Method for electrolyzing waste and old cathode carbon block by comprehensive utilization of aluminum

A technology of waste cathode carbon block and aluminum electrolysis, which is applied in solid waste removal, waste treatment, alumina/aluminum hydroxide, etc. It can solve the problems of low electrolyte recovery rate, difficult fluoride recovery, and poor separation effect. Achieve good application prospects, high recovery rate, and simple operating conditions
CN101480658AActive Publication Date: 2009-07-15NORTHEASTERN UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
NORTHEASTERN UNIV
Publication Date
2009-07-15

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Abstract

The invention relates to a method for comprehensively using aluminium to electrolyze a waste cathode carbon block, which belongs to the technical field of environment protection and comprises the following steps: crushing and grinding the waste cathode carbon block; adjusting the concentration and the PH value of ore slurry after the grinding, then using floatation equipment to carry out floatation treatment, and separating electrolyte and carbon which are contained in the waste cathode carbon block; using an aluminium salt solution to soak for extracting the electrolyte contained in a carbon product obtained from the floatation, and further improving the grade of a high-carbon product; mixing the grinding waste water, the floatation waste water and the soaking solution, and adding CaO and CaCl2 to precipitate and recover aluminium and fluothane in the mixture. The method for comprehensively using aluminium to electrolyze a waste cathode carbon block has simple operating condition, low energy consumption, high recovery ratio of valuable substances and good application prospect.
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Description

technical field

[0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for comprehensively utilizing waste cathode carbon blocks of aluminum electrolysis. Background technique

[0002] Aluminum electrolytic cell waste cathode carbon block is the waste discharged in the aluminum electrolysis industry. According to statistics, about 30-50 kg of waste cathode carbon blocks are discharged for every 1 ton of primary aluminum produced. As the annual production of aluminum worldwide increases, the amount of waste carbon briquettes discharged continues to increase. The main components of the waste cathode carbon block of aluminum electrolytic cell are carbon and electrolyte, in which the carbon content is 45-85% (the degree of graphitization of carbon reaches 80-90%), and the electrolyte content is about 15-55% (the electrolyte is mainly composed of cryolite, Sodium fluoride, aluminum oxide and calcium fluoride, while...

Claims

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