Electrolysis: processes – compositions used therein – and methods – Electrolytic synthesis – Utilizing fused bath
Patent
1994-09-02
1996-04-09
Gorgos, Kathryn
Electrolysis: processes, compositions used therein, and methods
Electrolytic synthesis
Utilizing fused bath
205361, 205372, C25C 306, C25B 100
Patent
active
055058230
ABSTRACT:
A process for smelting aluminum from a mixture of a double salt potassium-aluminum sulfate 2KAl(SO.sub.4).sub.2 and aluminum sulfate Al.sub.2 (SO.sub.4).sub.3 with potassium sulfate K.sub.2 SO.sub.4 having a weight ratio of 2KAl(SO.sub.4).sub.2 to K.sub.2 SO.sub.4 in the range of 50/50 to 15/85. The mixture is heated to a eutectic temperature that makes it molten and electrolysis is used to precipitate out aluminum at the negative electrode and gases from SO.sub.4 ions at the positive electrode. A critical amount of a feed of 2KAl(SO.sub.4).sub.2 is added to replace that which was consumed in the electrolysis and to maintain the weight ratio which provides for the low eutectic melting temperature.
REFERENCES:
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patent: 2827366 (1958-03-01), Saeman
patent: 2883273 (1959-04-01), Seaman
American Institute of Chemical Engineers, "Development of Sulfuric Acid Process"--pp. 58-73.
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Swedish Nat'l Committee, World Power Conference, Paper No. D10 by Prof. W. Palmaer "An Electrolytic Method of Removing Small Quantities of Iron From Solutions of Aluminium Salts"; pp. 626-633.
Nat'l Geographic, vol. 154, No. 2, Aug. 1978; "Aluminum, the Magic Metal" by Thomas Y. Canby; photos by James L. Amos; pp. 186-211.
U.S. Dept. of Interior, Bureau of Mines, 1963; R1 Bureau of Mines Report of Investigations 6290; "Methods for Producing Alumina From Clay", An Evaluation of a Potassium Alum Process; F. Peters; P. Johnson; R. Kirby.
Gorgos Kathryn
Schatzel Thomas E.
Solv-Ex Corporation
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