Method for replacing electrode of aluminum electrolysis cell

Abstract

The invention discloses a method for replacing an electrode of an aluminum electrolysis cell, which relates to the improvement of the method for replacing the electrode of the aluminum electrolysis cell in an aluminum electrolysis production process. The method for replacing the electrode of the aluminum electrolysis cell is characterized by comprising the following steps: during the replacement of a residual electrode in the aluminum electrolysis production process, putting the residual electrode on an anode tray, and then, covering a tray cover with the upper end being provided with an air exhausting pipe on the anode tray, exhausting carbon dioxide and volatile villiaumite which are released in the combustion of the residual electrode through the air exhausting pipe, and carrying out collection and treatment. By using the method provided by the invention, a closed or relatively closed space is formed by the tray cover connected with an original flue system of a workshop through a flue together with the anode tray and is used for storing a new electrode and the residual electrode when the electrode is replaced, so that the carbon dioxide and the volatile villiaumite which are released in the combustion of the residual electrode enter a purifying system of the workshop through the flue; the volatile villiaumite is adsorbed, recovered and returned to a charging system to be repeatedly used through the purifying system, thereby achieving the purposes of reducing the consumption of the villiaumite produced in electrolysis and purifying the air in the workshop; the new electrode is synchronously stored in a device; the new electrode can be preheated; the energy is saved; and the consumption is decreased.

Description

technical field [0001] A method for replacing electrodes of an aluminum electrolytic cell relates to an improvement of a method for replacing electrodes of an aluminum electrolytic cell during the aluminum electrolytic production process. Background technique [0002] At present, the production of primary aluminum in all countries in the world adopts the Hall-Héroult (Hall-Erout) method to produce through the cryolite-alumina molten salt electrolysis method, mainly using the carbon anode to electrolytically reduce alumina to generate liquid metal aluminum and carbon dioxide gas from The purification system is exhausted through the flue. Since the carbon anode is continuously consumed, it needs to be replenished continuously during the production process. Therefore, when the anode is consumed to a certain extent during the aluminum electrolysis production process, it must be replaced with a new anode. This process is called pole changing operation. Depending on the current l...

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Problems solved by technology

This will not only increase the pollution of the workshop environment, but also increase the consumption of fluorine salt in the electrolytic cell because the volatilized fluoride salt cannot be recycled, and increase the production cost of electrolytic aluminum

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