Online repair method for local damage of aluminum electrolytic cell cathode

Abstract

The invention provides an online repair method for local damage of an aluminum electrolytic cell cathode. When it is monitored that the content of iron in electrolytic cell primary molten aluminum rises abnormally, after the damaged portion of the electrolytic cell cathode is confirmed through the monitoring of the cell shell temperature, monitoring of the cathode square steel temperature and electrode extraction and furnace bottom groping of an electrolytic cell, the damaged portion of the cathode of the electrolytic cell is repaired on line. Compared with the prior art, the online repair method has the following beneficial effects that normal operation of the electrolytic cell is not affected; mixed materials used in the method are common or spare materials in electrolysis production, and the materials are obtained conveniently and fast without being specially purchased; the content of the iron in the repaired electrolytic cell primary molten aluminum can be decreased rapidly to be within the required range of aluminum ingot remelting; and further damage of the repaired portion can be inhibited through process adjustment and control over electrode change work.

Description

technical field [0001] The invention relates to the technical field of aluminum electrolysis production, in particular to a method for repairing damaged parts of cathodes in the normal operation state of an electrolytic cell on an aluminum electrolysis production line. Background technique [0002] During the production process of the aluminum electrolytic cell, due to reasons such as furnace building materials, furnace building technology and production management, the cathode furnace bottom will be partially damaged. If timely and effective treatment measures are not taken, it may lead to serious consequences of leakage. At present, the repairing techniques for the damage of the cathode of the aluminum electrolytic cell include: 1. The method of repairing the edge of the pole without stopping the cell. In this method, the materials used in the repair process cannot be quickly filled to the damaged position, and more materials will enter the undamaged part of the electrolyt...

AI Technical Summary

Problems solved by technology

In this method, the materials used in the repair process cannot be quickly filled to the damaged position, and more materials will enter the undamaged part of the electrolytic cell. The "double balance" (material balance and heat balance) during the operation of the electrolytic cell It is damaged, which seriously affects the production operation; the repair quality is not high, and the repair materials are mixed with aluminum liquid, electrolyte, alumina and other substances. After the electrolytic cell has been in operation for a period of time, the repair materials in the damaged parts are gradually melted, and the damage still exists. even exacerbated

2. Suspended overhaul method

The first method is to reduce the slotting rate and production capacity of the series, while there is still a certain amount of power consumption for shutdown; the second is that the shutdown and overhaul cost of large-scale prebaked aluminum electrolytic cells is relatively high (such as a 400kA aluminum electrolytic cell shutdown and overhaul once The cost is about 1.5 million yuan)

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