C - Chemistry – Metallurgy – 25 – C
Patent
C - Chemistry, Metallurgy
25
C
204/142, 204/49
C25C 3/06 (2006.01) C25C 3/08 (2006.01) C25C 3/12 (2006.01) C25C 3/18 (2006.01)
Patent
CA 1276906
ABSTRACT A method of producing aluminum by electrolysis of alumina dissolved in molten cryolite at temperatures between 680-900°C is disclosed. The method comprises the employment of permanent non-consumable anodes the total electrochemically active surface of which is increased to at least 1.5 times and up to 5 times the area of the anode projected onto a horizontal plane compared to the total surface of anodes in a classical Hall-Heroult cell of comparable production rate. This is achieved using a special configuration for the anode. 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.
501346
Gowling Lafleur Henderson Llp
Moltech Invent S.a.
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