Cermet inert anode for use in the electrolytic production of...

C - Chemistry – Metallurgy – 25 – C

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C25C 3/12 (2006.01)

Patent

CA 2385776

A cermet inert anode for the electrolytic production of metals such as aluminum is disclosed. The inert anode comprises a ceramic phase of the formula Ni x Fe2y M z O(3y+x+z>~.delta., where M is at least one metal selected from Zn, Co, Al, Li, Cu, Ti, V, Cr, Zr, Nb, Ta, W, Mb, Hf and rare earths, preferably Zn and/or Co, x is from 0.1 to 0.99, y is from 0.0001 to 0.9, z is from 0.0001 to 0.5, and 8 is from 0 to about 0.3. Preferred ceramic compositions comprise Fe2O3, NiO and ZnO or CoO. The cermet inert anode also comprises a metal phase such as Cu, Ag, Pd, Pt, Au, Rh, Ru, Ir and/or Os. A preferred metal phase comprises a Cu and Ag. The cermet inert anodes may be used in electrolytic reduction cells for the production of commercial purity aluminum as well as other metals.

Cette invention se rapporte à une anode inerte en cermet servant à la production électrolytique de métaux, tels que l'aluminium et comprenant à cet effet une phase céramique représentée par la formule <Ni>x<Fe>2y<M>z<O>(3y+x+z) +/- delta <, où M représente au moins un métal choisi parmi Zn, Co, Al, Li, Cu, Ti, V, Cr, Zr, Nb, Ta, W, Mb, Hf et des terres rares, telles que de préférence Zn et/ou Co, x est compris entre 0,1 et 0,99, y est compris entre 0,0001 et 0,9, z est compris entre 0,0001 et 0,5, et delta est compris entre 0 et environ 0,03. Les compositions céramiques préférées comprennent Fe>2<O>3<, NiO et ZnO ou CoO. Cette anode inerte en cermet contient également une phase métal, telle que Cu, Ag, Pd, Pt, Au, Rh, Ru, Ir et/ou Os. Une phase métal préférée comprend Cu et Ag. De telles anodes inertes en cermet peuvent servir dans des cellules de réduction électrolytique pour la production d'aluminium de pureté commerciale et d'autres métaux.

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