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Molten salt bath circulation design for an electrolytic cell

United States Patent

5,938,914
August 17, 1999
View the Complete Patent at the US Patent & Trademark Office
An electrolytic cell for reduction of a metal oxide to a metal and oxygen has an inert anode and an upwardly angled roof covering the inert mode. The angled roof diverts oxygen bubbles into an upcomer channel, thereby agitating a molten salt bath in the upcomer channel and improving dissolution of a metal oxide in the molten salt bath. The molten salt bath has a lower velocity adjacent the inert anode in order to minimize corrosion by substances in the bath. A particularly preferred cell produces aluminum by electrolysis of alumina in a molten salt bath containing aluminum fluoride and sodium fluoride.
Dawless; Robert K. (Monroeville, PA), LaCamera; Alfred F. (Trafford, PA), Troup; R. Lee (Murrysville, PA), Ray; Siba P. (Murrysville, PA), Hosler; Robert B. (Sarver, PA)
Aluminum Company of America (Pittsburgh, PA)
08/ 934,252
September 19, 1997
The Government has rights in this invention pursuant to Contract No. DE-FC07-89 ID 12848 awarded by the U.S. Department of Energy.