Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1979-08-17
1980-09-23
Williams, Howard S.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
C25C 308
Patent
active
042241286
ABSTRACT:
Described is a cathode assembly for an electrolytic cell for the production of metal, e.g., aluminum, by electrolysis of molten electrolyte containing a compound of the metal, e.g., alumina. The cathode assembly comprises pedestals, e.g., a carbon pedestal, disposed on the cell floor beneath the shadow of the anode of the cell. The pedestal rises from the cell floor to a height of at least the highest interface of the metal pad and molten electrolyte that exists during cell operation. Embedded in the pedestal is at least one refractory hard metal element, e.g., titanium diboride, which is embedded to a depth of at least about 75 percent of its length. The refractory hard metal element(s) can be flush with the top surface of the pedestal; but, preferably protrude slightly from the top surface of the pedestal. The refractory hard metal element can be a solid or hollow body, e.g., cylinder. The pedestal can have a refractory hard metal surface for its side walls and be shaped to assist in the drainage of molten aluminum.
REFERENCES:
patent: 3028324 (1962-04-01), Ransley
patent: 3093570 (1963-06-01), Dewey
patent: 3156639 (1964-11-01), Kibby
patent: 4071420 (1978-01-01), Foster et al.
PPG Industries Inc.
Stein Irwin M.
Williams Howard S.
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