Treatment method and device of electrolytic aluminum carbon slag

Abstract

The invention provides a treatment method and device of electrolytic aluminum carbon slag and belongs to the technical field of aluminum electrolysis. The treatment method is characterized by comprising the following steps: (1) removing impurities; (2) crushing; (3) after pre-heating carbon slag to 100 DEG C to 120 DEG C, adding into a treatment device, wherein the treatment device comprises a roasting chamber and a combustion chamber; raising the temprature of the roasting chamber to 1000 DEG C to 1100 DEG C; layering electrolyte in the carbon slag and the carbon slag; adding a separation agent to separate the electrolyte and the carbon slag; (3) conveying the separated carbon slag into the combustion chamber and burning up; (5) conveying flue gas generated by the combustion chamber into a heat exchange chamber to be subjected to heat exchange with air; conveying the heated air into a stock bin to pre-heat the carbon slag; (6) conveying the flue gas from a heat exchanger to a cloth bag type dust collector; collecting dust by the cloth bag type dust collector and conveying the dust into the stock bin; discharging the flue gas from the cloth bag type dust collector after the flue gas is purified to be qualified. The separation agent is a mixture of cryolite and aluminum oxide at the weight ratio of 5 to 1. According to the treatment method and device, a roasting method is essentially adopted to treat, the recovery rate of the electrolyte is high and the effect is good.

Description

technical field [0001] The invention relates to a treatment method and a special device for electrolytic aluminum carbon slag, belonging to the technical field of aluminum electrolysis. Background technique [0002] In the process of electrolytic aluminum production, carbon slag will inevitably be produced. Divided from the way of generation, carbon slag can be divided into anode carbon slag and cathode carbon slag. The way of generating anode carbon slag is: 1) The anode carbon block does not participate in the electrochemical reaction, falls off from the anode carbon block, mixes in the electrolyte, and forms carbon slag; The coke particles enter the electrolyte in the form of carbon slag, and finally form a large amount of carbon slag. The cathode carbon slag is mainly produced by the erosion and exfoliation of the cathode carbon lining. The main components of carbon slag are carbon, fluoride salts, alumina, iron compounds and other trace elements. [0003] "Comprehen...

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Problems solved by technology

[0007] The Chinese patent application number 201410089415.0 discloses a harmless treatment system and method for aluminum electrolysis waste carbon slag, which aims to solve the technical problems of low recycling rate of carbon slag and environmental pollution in the current electrolytic aluminum industry, including heating Furnace, heating circulation device, tail gas purification device, hopper corresponding to the heating furnace, and raw material warehouse corresponding to the hopper; the heating circulation device is respectively connected to the heating furnace and the raw material warehouse; The tail gas outlet of the tail gas purification device; the invention can effectively solve the problems of waste tank lining carbon slag stacking or landfill polluting the environment, causing a large amount of waste of raw materials and other problems that have plagued the electrolytic aluminum industry for many years

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