Controlled wettability graphite electrodes for selective use...

C - Chemistry – Metallurgy – 25 – C

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C25C 1/02 (2006.01) C25C 3/06 (2006.01) C25C 3/08 (2006.01) C25C 3/12 (2006.01) C25C 7/02 (2006.01)

Patent

CA 1143326

Abstract Metal such as aluminum is produced electrolytically from metal chlorides or other halides dissolved in a molten solvent bath of higher decomposition potential in a cell includ- ing one or more graphite cathode surfaces spaced from opposed anodes, particularly a bipolar cell, with bath flow through the spaces between the anodes and cathodes. The wetting character- istics of the carbonaceous cathode with respece to the metal deposited there by electrolysis are selectively balanced with the bath flow over the cathode and with the anode-to-cathode distance. Cathode surface wear rate is substantially reduced if the surface is wettable by the metal in regions of low bath flow velocity or regions of greater anode-cathode distance. The wear rate is also reduced by using non-wettable cathode surfaces in regions of higher bath flow velocity or regions of closer anode- cathode distance. Conditions of graphite manufacture, including raw material selection and graphitization temperature, are specified to achieve controlled wettability of graphite elec- trodes to enable the selective production of either condition for the particular cell operation invlolved.

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