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Method for innocent treatment of aluminum electrolysis anode carbon residue and recovery of electrolyte

A technology of harmless treatment and aluminum electrolysis anode, applied in the field of aluminum electrolysis, can solve the problems of low electrolyte recovery rate, complex process flow, low electrolyte purity, etc., achieve environmental protection benefits and economic benefits, short process flow, and operability strong effect

Active Publication Date: 2011-04-13
YUNNAN YONGXIN ALUMINUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has low electrolyte recovery rate, low electrolyte purity, high impurity content, complex process flow, high cost, and easy to cause secondary pollution, so it is rarely used in industry

Method used

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  • Method for innocent treatment of aluminum electrolysis anode carbon residue and recovery of electrolyte

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Add 624kg of anode carbon slag salvaged from the aluminum electrolytic cell into the energy-saving heat preservation furnace and heat it to 800°C to completely burn the combustibles in the carbon slag. The fluoride discharged during the smelting process is connected to the electrolytic flue gas purification system for recycling, and the electrolyte is harmlessly recovered.

[0015] Implementation results: 340kg of electrolyte was obtained by smelting and recovery, and electrolyte components: F: 40.9%; Al 2 o 3 : 28.37%; Na 2 O: 19.8%; CaO: 2.0%, the impurity content meets the requirements of the electrolyte.

Embodiment 2

[0017] 856kg of anode carbon slag salvaged from the aluminum electrolytic cell is added to the energy-saving heat preservation furnace and heated to 1500°C to completely burn the combustibles in the carbon slag. The fluoride discharged during the smelting process is connected to the electrolytic flue gas purification system for recycling, and the electrolyte is recovered harmlessly.

[0018] Implementation results: 435kg of electrolyte was obtained by smelting and recycling, among the electrolyte components: F: 42.97%; Al 2 o 3 : 27.37%; Na 2 O: 20.5%; CaO: 2.5%, the impurity content meets the requirements of the electrolyte.

Embodiment 3

[0020] Add 424kg of anode carbon slag salvaged from the aluminum electrolytic cell into the energy-saving heat preservation furnace and heat it to 1200°C to completely burn the combustibles in the carbon slag. The fluoride discharged during the smelting process is connected to the electrolytic flue gas purification system for recycling, and the electrolyte is recovered harmlessly.

[0021] Implementation results: 219kg of electrolyte was obtained by smelting and recycling, among the electrolyte components: F: 40.97%; Al 2 o 3 : 29.37%; Na 2 O: 21.5%; CaO: 3.5%, the impurity content meets the requirements of the electrolyte.

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Abstract

The invention discloses a method for innocent treatment of aluminum electrolysis anode carbon residue and recovery of electrolyte. The method comprises that: the anode carbon residue from an electrolytic cell is directly thrown into a power-saving holding furnace for smelting, and after a carbon material is completely combusted, the electrolyte completely forms an electrolyte melt; flue gas generated in the smelting process is introduced into an electrolysis series flue gas purification system, and fluoride gases are absorbed by alumina and returned to an electrolytic cell; the electrolyte melt directly enters the electrolytic cell for use or is cooled and ground for baking start-up of the electrolytic cell; and continuous feeding and continuous discharging are realized in the whole production process. The invention realizes innocent treatment of the anode carbon residue and comprehensive recycling of the electrolyte, and overcomes the defects that the carbon residue is needed to be crushed, ground and briquetted, various additives are needed to be added and environmentally-friendly treatment cannot be realized and the like in the prior art. The method is simple in technology, high in electrolyte recovery, low in production treatment cost and obvious in environment-friendly effects and economic benefits, and can realize harmlessness of the carbon residue after treatment.

Description

technical field [0001] The invention relates to the technical field of aluminum electrolysis, in particular to a method for harmless treatment of anode carbon slag and recycling of electrolyte in the process of aluminum electrolysis. Background technique [0002] In the process of aluminum electrolysis, the phenomenon of slag falling occurs due to the erosion of the anode carbon block by the electrolyte. Carbon slag affects the normal operation of aluminum electrolysis and needs to be salvaged from the electrolytic cell from time to time. Due to the immersion and penetration of electrolytes, carbon residues contain a large amount of electrolytes. According to relevant information, carbon residues contain 13.81% sodium, 8.42% aluminum, and 29.61% fluorine. Generally, the content of electrolyte in carbon residue is about 58%. According to the current national electrolytic aluminum production capacity of 16 million tons, about 160,000 tons of carbon residue will be produced e...

Claims

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Application Information

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IPC IPC(8): C25C3/12B09B3/00
Inventor 杨叶伟熊自勇赵瑞敏陈渝王建平普光平信伟松赵仕堂张川登臧永伟
Owner YUNNAN YONGXIN ALUMINUM
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