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Electrolyte treatment for aluminum reduction

United States Patent

December 24, 2002
View the Complete Patent at the US Patent & Trademark Office
A method of treating an electrolyte for use in the electrolytic reduction of alumina to aluminum employing an anode and a cathode, the alumina dissolved in the electrolyte, the treating improving wetting of the cathode with molten aluminum during electrolysis. The method comprises the steps of providing a molten electrolyte comprised of ALF.sub.3 and at least one salt selected from the group consisting of NaF, KF and LiF, and treating the electrolyte by providing therein 0.004 to 0.2 wt. % of a transition metal or transition metal compound for improved wettability of the cathode with molten aluminum during subsequent electrolysis to reduce alumina to aluminum.
Brown; Craig W. (Seattle, WA), Brooks; Richard J. (Seattle, WA), Frizzle; Patrick B. (Seattle, WA), Juric; Drago D. (Bulleen, AU)
Northwest Aluminum Technologies (Seattle, WA)
09/ 721,845
November 25, 2000
The work described herein was partially funded by Pacific Northwest National Laboratory, a unit of the U.S. Department of Energy, operated by Battelle Northwest; the contract number is 310468-A-UF.