A method and an electrowinning cell for production of metal

C - Chemistry – Metallurgy – 25 – C

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C25C 3/08 (2006.01) C25C 3/06 (2006.01)

Patent

CA 2439011

The present invention relates to a method for production of molten aluminium by electrolysis of an aluminous ore, preferably alumina, in a molten salt mixture, preferably a sodium fluoride - aluminium fluoride-based electrolyte. The invention describes an electrolysis cell for said production of aluminium by use of essentially inert electrodes in a vertical and/or inclined position, where said cell design facilitates separation of aluminium and evolved oxygen gas by providing a gas separation chamber (14) arranged in communication with the electrolysis chamber (22), thus establishing an electrolyte flow between the electrolysis chamber (22) and the gas separation chamber (14).

La présente invention concerne un procédé de production d'aluminium fondu par électrolyse d'un minerai alumineux, de préférence de l'alumine, dans un mélange salin fondu, de préférence un électrolyte à base de fluorure de sodium et fluorure d'aluminium. L'invention concerne également une cellule d'électrolyse destinée à la production d'aluminium par utilisation d'électrodes sensiblement inertes en position verticale et/ou inclinée, la conception de la cellule facilitant la séparation entre l'aluminium et les dégagements d'oxygène gazeux grâce à une chambre de dégazage (14) venant en communication avec la chambre d'électrolyse (22), ce qui permet un écoulement de l'électrolyte entre la chambre d'électrolyse (22) et la chambre de dégazage (14).

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