Method for producing refined aluminum by cryolite-alumina fused salt electrolysis process
A technology of molten salt electrolysis and alumina, applied in the field of aluminum electrolysis production, can solve the problems of high cost, low power consumption, large power consumption and the like
Inactive Publication Date: 2007-08-15
包头铝业有限公司
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[0002] There are three-layer liquid electrolysis and segregation methods for producing high-purity aluminum in foreign countries; the only domestic method for producing high-purity aluminum is three-layer liquid electrolysis. Aluminum layer, the middle layer is molten salt of fluoride and chloride, and the anode is an aluminum-copper (40%) alloy layer in the lower part of the electrolytic cell. The three-layer liquid electrolysis method uses metal aluminum as raw material, which is produced by secondary electrolysis with high purity. High-energy aluminum consumes a lot of electricity. The power consumption per ton of aluminum is about 16,000 degrees, and the cost is high. The segregation method also uses metal aluminum as a raw material, and uses the different solubility of impurity elements in solid aluminum and liquid aluminum to produce segregation when the aluminum melt condenses. To obtain high-purity aluminum, the power consumption is small, and the power consumption per ton of aluminum is about 600 degrees, but the raw material consumption is high, so that 30% of the aluminum will become aluminum with high impurity content.
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[0016] As shown in Figure 2, the present invention is a method for producing high-purity aluminum by cryolite-alumina molten salt electrolysis, which is characterized in that the high-purity aluminum produced by the aluminum electrolytic cell is used from a special aluminum outlet ladle Absorbed in the aluminum electrolytic tank, and then poured into a special smelting furnace for ingot casting, the specific method is as follows:
[0017] (1) In an electrolytic flue gas purification system, select 25% of the aluminum electrolytic cells in the system as the aluminum electrolytic cells for producing high-purity aluminum, because too many selections of the electrolytic cells will affect the purification effect of the flue gas;
[0018] (2) The electrolytic cell evaporates impurity elements during the electrolysis process, and enters the flue gas purification system with the electrolytic flue gas; the purified and recovered fluorine-loaded alumina containing impurities cannot enter...
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The invention relates to a method for producing refined aluminum by cryolite-alumina fused salt electrolysis process by using aluminium cell as the principal equipment, using alumina as raw material, using cryolite and alumina as molten salt, applying continuous current to the two electrodes of the electrolytic tank, separating out anodic gas containing impurity on the anode, entering flue gas clarification system for removal, and obtaining refined aluminum on the cathode.
Description
1. Technical field: [0001] The invention belongs to the field of aluminum electrolysis production methods, in particular to a method for producing high-purity aluminum by using cryolite-alumina molten salt electrolysis. 2. Background technology: [0002] There are three-layer liquid electrolysis and segregation methods for producing high-purity aluminum in foreign countries; the only domestic method for producing high-purity aluminum is three-layer liquid electrolysis. Aluminum layer, the middle layer is molten salt of fluoride and chloride, and the anode is an aluminum-copper (40%) alloy layer in the lower part of the electrolytic cell. The three-layer liquid electrolysis method uses metal aluminum as raw material, which is produced by secondary electrolysis with high purity. Aluminum consumes a lot of power. The power consumption per ton of aluminum is about 16,000 degrees, and the cost is high. The segregation method also uses metal aluminum as a raw material, and uses th...
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IPC IPC(8): C25C3/06
Inventor 芦林高刘刘志荣王云利李美孙喜喜蔡旭贾柯杨健
Owner 包头铝业有限公司