Non-carbon anodes with active coatings
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United States of America Patent
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Jun 22, 2010
Grant Date -
Aug 23, 2007
app pub date -
Mar 18, 2005
filing date -
Mar 18, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A cell for electrowinning aluminium from alumina, comprises: a metal-based anode having an electrochemically active outer part comprising a layer that contains predominantly cobalt oxide CoO; and a fluoride-containing molten electrolyte in which the active anode surface is immersed. The electrolyte is at a temperature below 950° C., in particular in the range from 910° to 940° C. The electrolyte consists of: 6.5 to 11 weight. % dissolved alumina; 35 to 44 weight % aluminium fluoride; 38 to 46 weight % sodium fluoride; 2 to 15 weight % potassium fluoride; 0 to 5 weight % calcium fluoride; and 0 to 5 weight % in total of one or more further constituents.
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