A kind of aluminum electrolysis method using aluminum as cathode

Abstract

The invention discloses an aluminum electrolysis method with aluminum as a cathode, and relates to the improvement on a method for producing electrolysis aluminum through a molten-salt method. The aluminum electrolysis method is characterized in that in the aluminum electrolysis process, molten aluminum at the bottom of an electrolysis cell is adopted as the cathode for conducting aluminum electrolysis; and the molten aluminum at the bottom of the electrolysis cell makes contact with a cathode busbar to form the aluminum electrolysis cathode. According to the aluminum electrolysis method with the aluminum as the cathode, a conventional anode system, a discharging system and a dust purifying system can be adopted in the aluminum electrolysis cell. According to the method, the molten aluminum in which no cathode carbon block, no steel bar and no titanium boride coating exist is adopted as the cathode to replace a cathode composed of steel bars and a carbon block set. The defects that according to a traditional aluminum electrolysis cell, aluminum oxide deposit exists on cathode carbon blocks and cellular micro-batteries exist are eliminated. In the electrolysis production process, the problem that aluminum oxide and aluminum carbide which are deposited and generated at the furnace bottom pollute electrolysis molten aluminum does not exist.

Description

technical field

[0001] An aluminum electrolysis method using aluminum as a cathode relates to the improvement of the aluminum electrolysis method produced by molten salt method. Background technique

[0002] At present, conventional electrolytic aluminum production uses cryolite-alumina melt as the electrolyte, carbon as the anode, and a cathode system composed of liquid aluminum, cathode carbon block, and cathode steel rod as the cathode, and a direct current is applied to precipitate CO at the anode. 2 Gas, and liquid aluminum is precipitated at the cathode. The schematic diagram of the traditional aluminum electrolytic cell is shown in figure 1 . According to the current technology, the production of 1 ton of metal aluminum needs to consume about 15,000kw h of integrated alternating current. Under the process conditions of aluminum electrolysis at 930-960°C, the energy utilization efficiency of aluminum electrolysis is less than 36% (anode carbon material consumption is ...

Examples

Embodiment Construction

[0028] An aluminum electrolysis method using aluminum as the cathode, the electrolysis process is to use the aluminum liquid at the bottom of the electrolytic cell 4 as the cathode for aluminum electrolysis; the aluminum liquid 6 at the bottom of the electrolytic cell contacts with the cathode bus 5 to form an aluminum electrolysis process cathode.

[0029] In the aluminum electrolysis method using aluminum as the cathode of the present invention, a partition wall 7 is fixedly connected to the side wall of the electrolytic cell on the inner side of both ends of the aluminum electrolytic cell body, and the bottom of the partition wall extends into the cathode aluminum liquid, and is connected with the electrolytic cell side wall. The bottom of the electrolytic cell forms the lower channel of the aluminum liquid, the partition wall and the inner walls of the two ends of the aluminum electrolytic cell form the side channel of the aluminum liquid, and the cathode busbar 5 contacts ...

technical field

[0001] An aluminum electrolysis method using aluminum as a cathode relates to the improvement of the aluminum electrolysis method produced by molten salt method. Background technique

[0002] At present, conventional electrolytic aluminum production uses cryolite-alumina melt as the electrolyte, carbon as the anode, and a cathode system composed of liquid aluminum, cathode carbon block, and cathode steel rod as the cathode, and a direct current is applied to precipitate CO at the anode. 2 Gas, and liquid aluminum is precipitated at the cathode. The schematic diagram of the traditional aluminum electrolytic cell is shown in figure 1 . According to the current technology, the production of 1 ton of metal aluminum needs to consume about 15,000kw h of integrated alternating current. Under the process conditions of aluminum electrolysis at 930-960°C, the energy utilization efficiency of aluminum electrolysis is less than 36% (anode carbon material consumption is ...

Examples

Embodiment Construction

[0028] An aluminum electrolysis method using aluminum as the cathode, the electrolysis process is to use the aluminum liquid at the bottom of the electrolytic cell 4 as the cathode for aluminum electrolysis; the aluminum liquid 6 at the bottom of the electrolytic cell contacts with the cathode bus 5 to form an aluminum electrolysis process cathode.

[0029] In the aluminum electrolysis method using aluminum as the cathode of the present invention, a partition wall 7 is fixedly connected to the side wall of the electrolytic cell on the inner side of both ends of the aluminum electrolytic cell body, and the bottom of the partition wall extends into the cathode aluminum liquid, and is connected with the electrolytic cell side wall. The bottom of the electrolytic cell forms the lower channel of the aluminum liquid, the partition wall and the inner walls of the two ends of the aluminum electrolytic cell form the side channel of the aluminum liquid, and the cathode busbar 5 contacts ...

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