Beneficiation treatment method for electrolytic aluminium carbon residues

Abstract

The invention relates to a beneficiation treatment method for electrolytic aluminium carbon residues. The method comprises the following steps: taking carbon residues out of the electrolytic cell for electrolytic aluminium, crushing and grinding the carbon residues into 20-60-mesh powder; adding water, a collecting agent and a foaming agent into the ground carbon residue particles to obtain ore pulp; and sequentially feeding the ore pulp into a roughing flotation machine and two scavenging flotation machines for flotation, wherein a foam product scraped by the roughing flotation machine is carbon powder and material obtained after the second scavenging flotation machine scavenges and scrapes off the foam product is filtered, dried and calcined to obtain a cryolite product. The beneficiation treatment method for electrolytic aluminium carbon residues can be used for enriching and efficiently recycling carbon and cryolite in electrolytic aluminium carbon residues.

Description

technical field [0001] The invention relates to the technical field of mineral flotation recovery of industrial secondary resources, in particular to a method for recovering carbon and cryolite through mineral processing of electrolytic aluminum carbon slag. Background technique [0002] In the prior art, in the production process of electrolytic aluminum, cryolite—alumina is usually added to the electrolytic prebaking tank as the molten salt electrolyte, and carbon blocks are used as the anode of aluminum electrolysis. Anode carbon blocks will produce a lot of carbon slag during the electrolysis process. The carbon slag in the electrolytic aluminum solution will lead to an increase in the resistance of the electrolyte, resulting in an increase in the voltage drop of the electrolyte, thereby increasing the power consumption of aluminum electrolysis. According to reports from relevant professionals, when the content of carbon slag in the aluminum electrolyte solution reaches ...

AI Technical Summary

Problems solved by technology

The carbon slag in the electrolytic aluminum solution will increase the resistance of the electrolyte, resulting in an increase in the voltage drop of the electrolyte, thereby increasing the power consumption of aluminum electrolysis. According to reports from relevant professionals, when the content of carbon slag in the aluminum electrolyte solution reaches 1 % (mass percentage), the conductivity of the electrolyte is reduced by about 11%. It can be seen that the adverse effect of carbon slag on the conductivity of the electrolyte is extremely significant

[0003] Moreover, the carbon slag in the aluminum electrolyte solution will also lead to the generation of a hot tank, causing the electrolyte solution to overheat and the tank temperature to rise

The hot tank phenomenon not only causes unnecessary consumption of electric energy, but also damages the imprint of the electrolytic tank and affects the life of the electrolytic tank. In addition, when dealing with the hot tank, a large amount of fluoride salt will be consumed, resulting in waste of resources and damage to the environment. Pollution

[0004] At the same time, the carbon slag in the electrolyte solution will also cause a large loss of current. When a large amount of carbon slag floats on the surface of the electrolyte solution, the carbon slag will form a current path with the carbon anode, and part of the current will directly enter the cathode and electrolytic cell through the carbon slag. side, but cannot participate in the electrolytic reaction, it is easy to cause side leakage of the electrolytic cell, and in severe cases, it will also cause side leakage