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Method for producing aluminium under low-temperature and apparatus thereof

A low-temperature, aluminum electrolytic cell technology, which is applied in the field of low-temperature production of aluminum, can solve the problems of the electrolytic cell not working normally, the reduction of the heat generated by the electrolyte resistance, etc., and achieve the effects of low cost, high current efficiency, and low energy consumption

Inactive Publication Date: 2005-09-28
UNIV OF SCI & TECH BEIJING
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the electrolytic cell cannot work normally due to the reduction of the heat generated by the electrolyte resistance during the aluminum electrolysis process in the diversion type aluminum electrolytic cell, propose a method for producing aluminum at low temperature in the diversion type aluminum electrolytic cell, and provide a method A special diversion type aluminum electrolytic cell device for realizing the method

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  • Method for producing aluminium under low-temperature and apparatus thereof

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Embodiment 1

[0010] Example 1, the current intensity of the aluminum electrolytic cell is 160kA, and the material used for the cathode coating is TiB 2 , C powder and MoSi 2 Composite material, MoSi 2 The weight percentage content is 2%, the C powder weight percentage content is 35%, TiB 2 The weight percent content is 63%, and it is made by vibration molding method, and the cathode gradient is 10°. The anode is a prebaked carbon anode, the slope at the bottom is parallel to the opposite cathode, and the slope is the same, and the pole distance of the electrolytic cell is 2.5cm. Both the electrolytic tank side wall material and the aluminum sink material use silicon nitride combined with silicon carbide material. The electrolyte used in the electrolysis is a sodium cryolite molten salt system, wherein the content of sodium cryolite is 85% by weight, the content of aluminum fluoride is 12% by weight, and the content of lithium fluoride is 3% by weight. The electrolyte is formed by using...

Embodiment 2

[0011] Embodiment 2, the current intensity of the aluminum electrolytic cell is 280kA, and the material used for the cathode coating is TiB 2 , C powder and MoSi 2 Composite material, MoSi 2 The weight percentage content is 3%, the C powder weight percentage content is 40%, TiB 2 The weight percent content is 57%, and it is made by vibration molding method, and the cathode slope is 15°. The material used for the anode is a common industrial prebaked anode, the slope at the bottom is parallel to the opposite cathode, the slope is the same, and the pole distance of the electrolytic cell is 2cm. Both the side wall material and the aluminum sink material use silicon nitride combined with silicon carbide material. The electrolyte used in the electrolysis is a sodium cryolite molten salt system, wherein the weight percentage of sodium cryolite is 70%, the weight percentage of aluminum fluoride is 25%, and the weight percentage of lithium fluoride is 5%. An electrolyte composed o...

Embodiment 3

[0012] Embodiment three, the current intensity of the aluminum electrolytic cell is 320kA, and the material used for the cathode coating is TiB 2 , C powder and MoSi 2 Composite material, MoSi 2 The weight percentage content is 5%, the C powder weight percentage content is 50%, TiB 2 The weight percent content is 45%, and it is made by vibration molding method, and the cathode gradient is 20°. The material used for the anode is a common industrial prebaked anode, the slope at the bottom is parallel to the opposite cathode, the slope is the same, and the pole distance of the electrolytic cell is 2.5cm. Both the side wall material and the aluminum sink material use silicon nitride combined with silicon carbide material. The electrolyte used in the electrolysis is a sodium cryolite molten salt system, wherein the content of sodium cryolite is 80% by weight, the content of aluminum fluoride is 15% by weight, and the content of lithium fluoride is 5% by weight. An electrolyte c...

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Abstract

The present invention belongs to the field of non-ferrous metal material, and is especially low temperature aluminum producing process in diversion type aluminum electrolytic bath. The present invention features the low temperature aluminum electrolyzing process at 850-950 deg.c in molten sodium cryolite salt system with alumina as material. The special diversion type aluminum electrolytic bath consists of cathode coating, cathode carbon block, anode, aluminum liquid, electrolyte, aluminum collecting tank and electrolytic bath side wall. Using the low melting point electrolyte in the diversion type aluminum electrolytic bath can make up the negative effect of insufficient heating of the electrolyte caused by the reduced polar distance and reduced bath voltage. The present invention can realize high current efficiency, low power consumption and low cost.

Description

technical field [0001] The invention belongs to the field of non-ferrous metal materials, in particular to a method for producing aluminum at low temperature in a flow-conducting aluminum electrolytic cell. Background technique [0002] Aluminum is produced by sodium cryolite-alumina molten salt electrolysis. Aluminum electrolysis production requires a lot of electricity, and electricity consumption accounts for about 30% of the cost of aluminum electrolysis production. At present, the pole distance of the industrial aluminum electrolytic cell is relatively large, generally 4-5cm, and the voltage distribution in the electrolyte part is about 35%, which is about 1.4V. If the pole distance of the aluminum electrolytic cell is reduced to 2-2.5cm, the voltage drop in the electrolyte part is about 0.7V, saving about 2000kWh per ton of aluminum. Diversion type TiB of Australian Comalco Aluminum Company 2 / C cathode electrolytic cell, aluminum electrolytic cell distance can be re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/06C25C3/18
Inventor 卢惠民
Owner UNIV OF SCI & TECH BEIJING
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