Controlled wettability graphite electrodes for selective use in

Details Controlled wettability graphite electrodes for selective use in Controlled wettability graphite electrodes for selective use in

1979-02-26

1979-12-18

Williams, Howard S.

Chemistry: electrical and wave energy

Processes and products

204243R, 204244, 204247, 204294, C25B 1112, C25C 306, C25C 312

Patent

active

041793455

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 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 carbonaceous 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 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 electrodes to enable the selective production of either condition for the particular cell operation involved.

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), Kinosz et al.

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