Aluminum electrolysis bath after-starting stable electrode-changing method

Abstract

The invention discloses a stable anode-changing method at the late period of an aluminum electrobath. The anode is changed from 13th day after aluminum electrobath startup, in order to assure successive production as changing anode in normal period, a residual anode capable of producing for 18 days is used in 16th day and 19th day after aluminum electrobath startup; a residual anode capable of producing for 20 days is used in 22th day after aluminum electrobath startup; a residual anode capable of producing for 11 days is used in 25th after aluminum electrobath startup; a residual anode capable of producing for 11 days is used in 28th day after aluminum electrobath startup; and a residual anode capable of producing for 7 days is used in 32th day after aluminum electrobath startup. The invention has no anode changing after successive 12 days after aluminum electrobath startup, energy balance of the electrobath is not affected during this period, firm and structured furnace wall is formed, so that the electrobath has effects of stability, high efficiency and low consumption, thus improving the economic index of an enterprise.

Description

1. Technical field: [0001] The invention relates to a method for replacing an anode of an aluminum electrolytic cell, in particular to a method for stably changing poles in the later stage of startup of an aluminum electrolytic cell, and belongs to the field of aluminum electrolytic cell production. 2. Background technology: [0002] At present, the aluminum electrolysis industry generally uses carbon-consumable anodes. The anode group is composed of anode carbon blocks and aluminum guide rods. . Generally, the height of the anode is about 580mm, and the average daily consumption is about 15mm. One anode can be used continuously for 30 days (the height of the residual electrode is guaranteed to be 130mm). Replacing the anode (referred to as pole change) is one of the necessary periodic tasks in the aluminum electrolysis production process. In order to continue the electrolysis production, people need to replace a new anode when the anode is consumed and becomes a residual p...

AI Technical Summary

Problems solved by technology

The main problem with this method is that a large amount of heat needs to be supplemented within one week after the start-up of the electrolyzer to maintain a stable energy balance, so that the electrolyzer can form a firm and regular furnace side, and it will start on the 4th day after start-up. Changing poles will cause the electrolytic cell to lose a large amount of energy, and the thermal balance of the electrolytic cell will be continuously damaged, severely affecting the formation of the furnace side of the electrolytic cell, and also affecting the current efficiency and energy consumption of the electrolytic cell