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Inert anode containing oxides of nickel iron and cobalt useful for the electrolytic production of metals

United States Patent

April 16, 2002
View the Complete Patent at the US Patent & Trademark Office
An inert anode for the electrolytic production of metals such as aluminum is disclosed. The inert anode includes a ceramic oxide material preferably made from NiO, Fe.sub.2 O.sub.3 and CoO. The inert anode composition may comprise the following mole fractions of NiO, Fe.sub.2 O.sub.3 and CoO: 0.15 to 0.99 NiO; 0.0001 to 0.85 Fe.sub.2 O.sub.3 ; and 0.0001 to 0.45 CoO. The inert anode may optionally include other oxides and/or at least one metal phase, such as Cu, Ag, Pd, Pt, Au, Rh, Ru, Ir and/or Os. The Ni--Fe--Co--O ceramic material exhibits very low solubility in Hall cell baths used to produce aluminum.
Ray; Siba P. (Murrysville, PA), Liu; Xinghua (Monroeville, PA), Weirauch, Jr.; Douglas A. (Murrysville, PA)
Alcoa Inc. (Pittsburgh, PA)
09/ 542,320
April 4, 2000
GOVERNMENT CONTRACT The United States Government has certain rights in this invention pursuant to Contract No. DE-FC07-98ID 13666 awarded by the United States Department of Energy.