The hazards of pre-baked anodic oxidation slag and cracks

Pubdate: 12-25 2021

During the operation of the electrolytic cell, carbon slag and fragments are continuously produced around the bottom of the anode carbon block, which will not only increase the carbon consumption, but the carbon slag fragments suspended in the electrolyte will destroy the normal technical conditions of electrolytic aluminum production and seriously endanger the production of aluminum electrolysis. Normal operation, even leading to an accident shutdown.

The hazards of pre-baked anodized slag and cracks are mainly as follows:

1. Change the conductivity of the electrolyte, thereby affecting the normal operation of aluminum electrolysis production.

2. Make the electrolyte generate heat and generate a heat sink. The accumulation of carbon slag and the increase of electrolyte resistance result in an increase in the cell voltage and an increase in heat income, which gradually leads to the heat cell. As a result, the current efficiency decreases, and the power consumption, carbon consumption, and unit consumption of fluoride salt increase.

3. Scraping of carbon residue increases the workload and causes economic losses. In order to keep the electrolytic cell running smoothly, the electrolyte crust must be opened at 1000. C. Continuously remove carbon slag and broken carbon anode blocks from the electrolyte. The removed carbon residue contains about 70% electrolyte, which not only increases the consumption of carbon and fluoride salt, but also increases the loss of heat energy and manpower.

4. Long anode bag and side leakage. The carbon slag and anode fragments will gather together, and when they are gathered on the side, it will cause the current to leak along the anode-the gathered carbon slag fragments to the side, making the furnace side difficult to form.

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