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Maintaining molten salt electrolyte concentration in aluminum-producing electrolytic cell

United States Patent

January 4, 2005
View the Complete Patent at the US Patent & Trademark Office
A method of maintaining molten salt concentration in a low temperature electrolytic cell used for production of aluminum from alumina dissolved in a molten salt electrolyte contained in a cell free of frozen crust wherein volatile material is vented from the cell and contacted and captured on alumina being added to the cell. The captured volatile material is returned with alumina to cell to maintain the concentration of the molten salt.
Barnett; Robert J. (Goldendale, WA), Mezner; Michael B. (Sandy, OR), Bradford; Donald R (Underwood, WA)
Northwest Aluminum Technologies (Seattle, WA)
10/ 055,153
January 25, 2002
The government has rights in this invention pursuant to Contract No. DE-FC07-98ID13662 awarded by the Department of Energy.