METALLIC OXYGEN EVOLVING ANODE OPERATING AT HIGH CURRENT DENSITY FOR ALUMINIUM REDUCTION CELLS

European Patent Office Patent

PATENT NO 2324142
APP PUB NO EP-2324142-A2
SERIAL NO

09782442

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Abstract

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A metallic oxygen evolving anode for electrowinning aluminum by decomposition of alumina dissolved in a cryolite-based molten electrolyte, and operable at anode current densities of 1.1 to 1.3 A/cm2, comprises an alloy of nickel, iron, manganese, optionally copper, and silicon. Preferably, the alloy is composed of 64-66 w % Ni; Iron; 25-27 w % Fe; 7-9 w % Mn; 0-0.7 w % Cu; and 0.4-0.6 w % Si. The weight ratio Ni/Fe is in the range 2.1 to 2.89, preferably 2.3 to 2.6, the weight ratio Ni/(Ni+Cu) is greater than 0.98, the weight ratio Cu/Ni is less than 0.01, and the weight ratio Mn/Ni is from 0.09 to 0.15. The alloy surface can comprise nickel ferrite produced by pre-oxidation of the alloy. The alloy, optionally with a pre-oxidized surface, can be coated with an external coating comprising cobalt oxide CoO.

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Patent Owner(s)

Patent OwnerAddress
RIO TINTO ALCAN INTERNATIONAL LIMITEDCA1188 SHERBROOKE STREET WEST MONTREAL H3A 3G2

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Inventor(s)

Inventor Name Address
NGUYEN THINH TRONG CH-1213 ONEX

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