Cathode carbon blocks are an important component of the inner lining of aluminum electrolysis cells. The performance of cathode carbon blocks has a significant impact on the power consumption and lifespan of the cell. As a container, cathode carbon blocks should be resistant to corrosion from aluminum liquid and electrolyte, while also ensuring uniform distribution of current in the aluminum liquid and electrolyte.
The cathode carbon block is mainly divided into Anthracite carbon block, graphitic carbon block and graphitized carbon block. In order to avoid severe corrosion of the cathode, extend the service life of the cell as much as possible, and optimize the operation status of the electrolytic cell, currently, 30% or 50% graphite carbon blocks are mainly used domestically and internationally.
Compared with 50% graphitized cathode carbon block, graphitized cathode carbon block is slightly inferior to 50% graphitized cathode carbon block in terms of corrosion resistance, and other aspects such as thermal shock resistance, heat conduction, conductivity and sodium expansion rate, graphitized cathode carbon block is superior to graphitized carbon block.
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