Chemistry: electrical and wave energy – Processes and products
Patent
1986-02-13
1987-07-21
Niebling, John F.
Chemistry: electrical and wave energy
Processes and products
204245, C25C 306, C25C 312
Patent
active
046816712
ABSTRACT:
A method of producing aluminum by electrolysis of alumina dissolved in molten cryolite at temperature between 680.degree.-690.degree. C. is disclosed. The method comprises the employment of permanent anodes the total surface of which is increased up to 5 times compared to the total surface of anodes in a classical Hall-Heroult cell of comparable production rate. By this means the anodic current density is lowered to a degree which permits the discharge of oxide ions preferentially to fluoride ions at an acceptable rate. Additionally, the electrolyte is circulated by suitable means whereby it passes from an enrichment zone where it is saturated with alumina to an electrolysis zone and back.
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"Oxide Solubility in Lithium Chloride-Aluminum Chloride Melts", W. E. Haupin, Aluminum Company of America.
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EP 85810063, European Standard Search Report, dated Nov. 7, 1985 "The Alcoa and Toth Processes of Aluminium Production--Outline and Comparison", K. Grjotheim, C. Krohn and H. A. Oye, Aluminium 51 (1975)11, pp. 697/699.
Eltech Systems Corporation
Freer John J.
Niebling John F.
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