Method and apparatus for protecting electrodes from thermal shoc

Details Method and apparatus for protecting electrodes from thermal shoc Method and apparatus for protecting electrodes from thermal shoc

1979-11-08

1981-05-05

Williams, Howard S.

Chemistry: electrical and wave energy

Processes and products

204243R, 204280, 204292, 204293, C25C 306, C25C 308

Patent

active

042657172

ABSTRACT:
Method and apparatus for protecting electrodes of an electrolytic cell from thermal shock when the temperature of the cell is raised from room temperature to an elevated operating temperature. For aluminum electrolysis at about 950.degree. C., a cavity in each cathode is filled with a metal plug, preferably a solid plug of 33.2% Cu--Al alloy. A portion of each cathode protruding into a chamber of the cell is provided with a sleeve of insulating material, preferably expanded fibrous kaolin. A heat dispersing means encircles each cathode radially outwardly thereof. A preferred form of the heat dispersing means is a stainless steel jacket located externally of the insulating material sleeve. After the cell is heated, the chamber is filled with a bath, and electrolysis is established.

REFERENCES:
patent: 4071420 (1978-01-01), Foster
patent: 4146444 (1979-03-01), Minick
patent: 4177128 (1979-12-01), Rahn

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