Aluminium electrowinning cells with oxygen-evolving anodes

Details Aluminium electrowinning cells with oxygen-evolving anodes Aluminium electrowinning cells with oxygen-evolving anodes

C - Chemistry, Metallurgy

25

C

C25C 3/12 (2006.01) C25C 7/02 (2006.01)

Patent

CA 2357717

A cell for the electrowinning of aluminium comprises at least one non-carbon metal-based anode (10) having an electrically conductive metallic structure (12, 13, 15) which is suspended substantially parallel to a facing cathode (20, 21, 22). Such metallic structure (12, 13, 15) comprises a series of parallel horizontal anode members (15), each having an electrochemically active surface (16) on which during electrolysis oxygen is anodically evolved. The electrochemically active surfaces (16) are in a generally coplanar arrangement to form the active anode surface. The anode members are spaced apart from one another by inter-member gaps forming flow-through openings (17) for the circulation of electrolyte (30) driven by the escape of anodically-evolved oxygen. The electrolyte (30) may circulate upwardly and/or downwardly in the flow-through openings (17) and possibly around the anode structure (12, 13, 15).

L'invention concerne une cellule d'extraction électrolytique de l'aluminium comprenant au moins une anode (10) à base d'un métal autre que le carbone dotée d'une structure métallique (12, 13, 15) conductrice d'électricité suspendue en position sensiblement parallèle à une cathode opposée (20, 21, 22). Cette structure métallique (12, 13, 15) comprend une série d'éléments d'anode (15) horizontaux parallèles, présentant chacun une surface électrochimiquement active (16) sur laquelle de l'oxygène est émis par l'anode pendant l'électrolyse. Les surfaces électrochimiquement actives (16) sont généralement disposées de façon coplanaire afin de former la surface active des anodes. Les éléments d'anode sont séparés les uns des autres par des espaces intercalaires formant des ouvertures de propagation (17) laissant circuler l'électrolyte (30) entraîné par l'échappement d'oxygène émis par l'anode. L'électrolyte (30) peut circuler vers le haut et/ou vers le bas dans les ouvertures de propagation (17) et éventuellement autour de la structure de l'anode (12, 13, 15).

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