Energy saving and consumption reduction method of aluminum reduction cell

Abstract

The invention discloses an energy saving and consumption reduction method of an aluminum reduction cell, which is applicable to the aluminum reduction cell with current intensity higher than 60 kA. The invention comprises a retaining block which is placed on a cathode carbon block, and the retaining block can be one block or a plurality of blocks according to the size of cell capacity. The retaining block can be horizontally placed along the major axis direction or the minor axis direction of the reduction cell, the other parts at the lower part of the retaining block except support legs are opened, the height of the retaining block is not beyond the height of a molten aluminum layer of the reduction cell. In the invention, owning to the existence of the retaining block, the fluctuation in the molten aluminum layer is decreased, the polar distance is reduced, the cell voltage is decreased significantly, and the electric energy efficiency is increased.

Description

technical field [0001] The invention relates to a method for saving energy and reducing consumption of an aluminum electrolytic cell, which is suitable for an aluminum electrolytic cell with a current intensity above 60kA and belongs to the technical field of aluminum electrolysis. Background technique [0002] The Hall-Heroult electrolyser currently used for aluminum industry production uses a carbon anode and a carbon block at surface level as the cathode to produce aluminum by electrolysis of alumina. The electrolyte mainly consists of cryolite and alumina melt with additional fluorine dissolved in it. Aluminum and other fluoride salts. The electrolytically separated aluminum is accumulated on the upper part of the cathode of the carbon block at the bottom of the tank, forming an aluminum liquid layer and serving as a part of the cathode. [0003] In the existing Hall-Heroult aluminum electrolytic cell, about 50% of the electric energy is used for electrolytic production...

AI Technical Summary

Problems solved by technology

The pole distance of the existing aluminum electrolytic cell is generally about 4.5cm, and a higher pole distance causes a higher electrolyte voltage drop, resulting in high power consumption of the electrolytic cell

[0004] How to reduce the pole distance of the aluminum electrolytic cell, reduce the voltage of the cell, and save energy consumption. In the current aluminum electrolytic cell, the anode current passes through the aluminum liquid layer and is transmitted to the cathode. At the same time, the current of the busbar around the aluminum electrolytic cell forms a magnetic field in the inner lining melt zone , the interaction between the horizontal current and the vertical magnetic field in the aluminum liquid generates electromagnetic force, which promotes the fluctuation of the aluminum liquid. This fluctuation makes the aluminum electrolytic cell must maintain a high pole distance. If the pole distance is reduced, the electrolytic cell will become unstable. Stable, loses current efficiency, it is difficult to achieve the purpose of energy saving

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