Selective use of wettable and non-wettable graphite electrodes i

Details Selective use of wettable and non-wettable graphite electrodes i Selective use of wettable and non-wettable graphite electrodes i

1979-02-26

1979-12-18

Williams, Howard S.

Chemistry: electrical and wave energy

Processes and products

204245, C25C 306

Patent

active

041793463

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 including one or more carbonaceous or graphite cathode surfaces spaced from opposed anodes, particularly a bipolar cell, with bath flow through the spaces between the anodes and cathodes. The wetting characteristics of the graphite cathode with respect 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 a non-wettable cathode surface in regions of higher bath flow velocity or regions of closer anode-cathode distance.

REFERENCES:
patent: 3725222 (1973-04-01), Russell et al.
patent: 3755099 (1973-08-01), Haupin
patent: 3822195 (1974-07-01), Dell et al.
patent: 4121983 (1978-10-01), Kimosz et al.

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