Chemistry: electrical and wave energy – Processes and products
Patent
1985-04-22
1986-08-26
Valentine, Donald R.
Chemistry: electrical and wave energy
Processes and products
204241, 204246, 204247, 204291, 204294, 204274, C25C 306, C25C 308, C25C 322
Patent
active
046081356
ABSTRACT:
The invention is an improvement in the construction of a Hall cell for the production of aluminum by electrolytic reduction of alumina in a molten salt bath wherein a conductive carbon cathode lining comprising a bottom wall and a sidewall is surrounded adjacent the outer surface thereof with an insulating layer, and a layer of conductive material overlies the inner surface of at least the bottom wall of the carbon lining to reduce the effective spacing between the cathode and one or more anodes in the cell to thereby reduce the power consumption of the cell. The improvement comprises an air passageway between the insulating layer and the outer surface of the carbon lining sidewall and an air inlet port adjacent the bottom of the passageway for passing air into the air passageway and along the outer surface of the carbon lining sidewall whereby the carbon sidewall may be cooled sufficiently to permit the formation of a protective layer of frozen bath on the inner surface thereof. The heated air then flows across the top of the cell whereby the cell retains at least a part of the heat exchanged through the sidewall.
REFERENCES:
patent: 3673074 (1972-06-01), Hirt et al.
patent: 3729399 (1973-04-01), Kibby
patent: 4033846 (1977-07-01), Engesland
patent: 4087345 (1978-05-01), Sandvik et al.
patent: 4222841 (1980-09-01), Miller
patent: 4410403 (1983-10-01), Jacobs et al.
Alexander Andrew
Aluminum Company of America
Taylor John P.
Valentine Donald R.
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