Non-carbon anodes with active coatings

Details Non-carbon anodes with active coatings Non-carbon anodes with active coatings

2005-03-18

2010-06-22

Bell, Bruce F (Department: 1795)

Chemistry: electrical and wave energy

Apparatus

Electrolytic

C204S245000, C205S372000, C205S384000, C205S385000, C205S387000, C205S395000

Reexamination Certificate

active

07740745

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.

REFERENCES:
patent: 6521116 (2003-02-01), Duruz et al.
patent: 6533909 (2003-03-01), Duruz et al.
patent: 2003/0070937 (2003-04-01), Duruz et al.
patent: 2007/0144617 (2007-06-01), De Nora et al.
patent: 2008/0041729 (2008-02-01), De Nora et al.

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