A drained cathode cell for the production of aluminium

Details A drained cathode cell for the production of aluminium A drained cathode cell for the production of aluminium

C - Chemistry, Metallurgy

25

C

C25C 3/08 (2006.01)

Patent

CA 2295495

A drained cathode cell for the produc-tion of aluminium by the electrolysis of an aluminium compound dissolved in a molten electrolyte, in which a dimensionally stable active cathode surface (35) has a sloping aluminium-wettable surface (37) permitting the produced aluminium to drain from the cathode surface. The anodes (10) are car-bon or non-carbon anodes with active faces (16) facing cathode surfaces (35) both at a slope up to about 60°. The anode-cathode gap between the sloping anodes and cath-odes is no more than 3 cm and is config-ured such that an upward circulation of the electrolyte is induced in the anode-cathode space by the anodically-released gases. An alumina-rich melt is fed at the lower part of the anode-cathode gap.

Cellule à cathode drainée pour la production d'aluminium par électrolyse d'un composé d'aluminium dissous dans un électrolyte fondu, dans laquelle les surfaces (35) de cathode actives ont des dimensions stables et possèdent une surface (37) en pente, mouillable par l'aluminium, qui permet le drainage de l'aluminium produit de la surface de la cathode. Les anodes (10) sont des anodes en carbone ou exemptes de carbone dotées de faces actives (16) faisant face aux surfaces (35) de la cathode, lesdites faces et surfaces étant inclinées jusqu'à environ 60 DEG . L'espace entre les surfaces inclinées des anodes et de la cathode ne dépasse pas 3 cm et est configuré de telle manière qu'une circulation ascendante de l'électrolyte est induite dans ledit espace par les gaz libérés par l'anode. Un bain riche en alumine est introduit dans la partie inférieure de l'espace anode-cathode.

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