Drained-cathode aluminium electrowinning cell with improved...

C - Chemistry – Metallurgy – 25 – C

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C25C 3/08 (2006.01)

Patent

CA 2384285

A drained-cathode cell for the electrowinning of aluminium comprises one or more anodes (14) suspended over one or more cathodes (16). The or each anode (14) and cathode (16) respectively have a sloped V-shaped active anode surface (22) and parallel sloped inverted V-shaped drained cathode surfaces (18) facing one another and spaced apart by two sloped inter-electrode gaps (20), arranged so the electrolyte circulates upwardly in the sloped inter-electrode gaps (20) assisted by anodically produced gas and then returns from a top part (22') to a bottom part (22'') of each inter-electrode gap (20) along an electrolyte path (26, 27, 36, 37). Each electrolyte path (26, 27, 36, 37) extends through vertical and horizontal passages as follow: a vertical passage (27) from a top to a lower part of a cathode (16) and then a horizontal passage (26) in or under the lower part of the cathode (26), and/or a horizontal passage (36) in or on an upper part of an anode (14) and then a vertical passage (37) extending from the upper to a bottom part of the anode (14). Each horizontal passage (26, 36) extends substantially over the entire horizontal length of a corresponding inter-electrode gap (20).

La présente invention concerne une cellule d'extraction électrolytique d'aluminium à cathode drainée comprenant au moins une anode (14) suspendue au-dessus d'au moins une cathode (16). Chacune de ces anodes (14) et cathodes (16) présente une surface anodique active (22) en V incliné et des surfaces cathodiques drainées (18) parallèles en V inversé incliné se faisant face-à-face, séparées par deux espaces inter-électrodes (20) inclinés disposés de façon que l'électrolyte remonte dans les espaces inter-électrodes (20) sous l'assistance du gaz d'anode puis redescend d'une zone haute (22') vers une zone basse (22'') de chacun des espaces inter-électrodes (20) le long d'un chemin d'électrolyte (26, 27, 36, 37). Chaque chemin d'électrolyte (26, 27, 36, 37) utilise des passages verticaux et horizontaux comme suit: un passage vertical (27) du haut vers le bas d'une cathode (16) puis un passage horizontal (26) dans ou en dessous de la zone inférieure de la cathode (26) et/ou un passage horizontal (36) dans ou sur une partie supérieure d'une anode (14) puis un passage vertical d'une zone supérieure à une zone inférieure de l'anode (14). Chaque passage horizontal (26, 36) occupe sensiblement la totalité de la longueur horizontale d'un espace inter-électrodes correspondant (20).

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