A method for shortening the conduction time of the new anode current in the electrolytic cell

Abstract

The invention discloses a method for reducing new anode current conducting time of an electrolytic cell, and belongs to the technical field of aluminium electrolysis. The method comprises the following steps: (1) mounting an aluminium plate on the bottom surface of a new anode to be replaced; (2) during aluminium electrolysis, when the anode is replaced, falling down the new anode from the electrolytic cell through a crown block to enable the bottom surface of the new anode and the aluminium plate to penetrate through electrolyte and enter liquid aluminum, and melting the aluminium plate; (3) when current of the new anode rises to above 50% of normal working current, lifting the new anode into the electrolyte for normal production. By the method, a guarantee can be provided for smooth electrolysis and reduction of energy consumption.

Description

technical field [0001] The invention belongs to the technical field of aluminum electrolysis, in particular to a method for shortening the conduction time of new anode current in an electrolytic cell. Background technique [0002] Aluminum electrolytic cells need to periodically replace the old carbon anodes that have been depleted with new carbon anodes. Since the new anode is at normal temperature before it is placed in the electrolytic cell, after it is placed in the electrolyte melt at nearly 1000 ° C, due to the temperature difference, a layer of electrolyte will immediately condense on the surface of the new anode, which prevents the new anode from interacting with the electrolyte. The passage of current between them; as the new anode is continuously heated by the high-temperature melt, the solidified electrolyte on the surface gradually melts, and the temperature of the anode rises, and the new anode gradually introduces current. Generally, it takes nearly one day fo...

AI Technical Summary

Problems solved by technology

Generally, it takes nearly one day for a new anode to gradually reach the rated current. The rising current characteristics of the new anode lead to serious uneven distribution of anode current in the electrolytic cell, which often causes voltage fluctuations in the electrolytic cell and affects normal production; at the same time, Due to the uneven conduction of the anode, the current efficiency index and even the energy consumption index of the electrolytic cell will also be affected

In view of this, many experts have proposed to preheat the new anode to shorten the anode conduction time, but due to the difficulty of actual operation, this measure has not been widely used

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