Aluminium electrowinning cells with non-carbon anodes

C - Chemistry – Metallurgy – 25 – C

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C25C 3/12 (2006.01)

Patent

CA 2557955

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 wich 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.

La présente invention a trait à une cellule pour l'extraction électrolytique d'aluminium à partir d'alumine, comportant : une anode à base de métal comprenant une partie externe d'activité électrochimique comportant une couche contenant majoritairement de l'oxyde de cobalt CoO ; et un électrolyte fluoré en fusion dans lequel la surface anodique active est immergée. L'électrolyte est à une température inférieure à 950 °C, notamment comprise entre 910° et 940 °C. L'électrolyte est constitué de : 6,5 à 11 % en poids d'alumine dissoute ; 35 à 44 % en poids de fluorure d'aluminium ; 38 à 46 % en poids de fluorure de sodium ; 2 à 15 % en poids de fluorure de potassium ; 0 à 5 % en poids de fluorure de calcium ; 0 à 5 % en poids au total d'un ou de plusieurs autres constituants.

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