Treated carbon cathodes for aluminum production, the process of

Details Treated carbon cathodes for aluminum production, the process of Treated carbon cathodes for aluminum production, the process of

1994-05-02

1995-01-03

Gorgos, Kathryn

Chemistry: electrical and wave energy

Processes and products

204290R, 204291, 204294, 204243R, 204130, 4271261, 427190, 264105, 252506, C25C 306, C25C 308

Patent

active

053783271

ABSTRACT:
To improve its resistance to penetration and degradation by sodium, a carbon cathode for use in aluminium production by the electrolysis of alumina dissolved in a cryolite-based molten electrolyte is pre-treated with a solution, suspension or melt of a compound of lithium, sodium and/or potassium. This pre-treatment takes place prior to, during or after forming the cathode but before use thereof. The entire carbon cathode, or only that part of the carbon which is nearest to the active cathode surface is treated, making it more resistant to penetration by components of the molten electrolyte of aluminium.

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