Cell for the electrowinning of aluminium operating with...

C - Chemistry – Metallurgy – 25 – C

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C25C 3/08 (2006.01)

Patent

CA 2437687

A cell for the electrowinning of aluminium comprises a horizontal carbon cathode bottom (11) having an aluminium-wettable surface coating (25) and a series of plates (21) made of aluminium-wettable reticulated porous material, typically foams, filled with aluminium and placed flat on the aluminium- wettable surface coating (25). During use, a thin bottom layer of aluminium (22) wets the aluminium-wettable surface coating (25) on top of the cathode bottom (11) and a bottom part of the porous aluminium-filled plates (21). A top layer of aluminium (23) is formed above the porous aluminium-filled plates (21). The cell may be operated with metal anodes (10) possibly protected with a cerium oxyfluoride coating when operated above about 910~-930~C.

La présente invention concerne une cellule pour l'électro-obtention d'aluminium comportant une base cathodique au carbone horizontale (11) présentant un revêtement de surface mouillable à l'aluminium (25) et une série de plaques (21) en matériau poreux réticulé mouillable à l'aluminium, tel que des mousses, remplies d'aluminium et disposé à plat sur le revêtement de surface mouillable à l'aluminium (25). Lors de son utilisation, la couche mince d'aluminium (22) mouille le revêtement de surface mouillable à l'aluminium (25) à la face supérieure de la base cathodique (11) et une partie inférieure des plaques poreuses remplies d'aluminium (21). Une couche supérieure d'aluminium (23) se forme au dessus des plaques poreuses remplies d'aluminium (21). La cellule peut fonctionner avec des anodes métalliques (10) éventuellement protégées par un revêtement d'oxyfluorure de cérium lors de son utilisation à une température supérieure à environ 910-930 ·C.

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