Multi-polar cell for the recovery of a metal by electrolysis...

C - Chemistry – Metallurgy – 25 – C

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204/142, 204/184

C25C 7/00 (2006.01)

Patent

CA 2217706

An electrolytic cell for the recovery of metal from a molten electrolyte and an electrode assembly for use in such a cell. The cell (10) comprises an electrode assembly consisting of an anode (17), a cathode (19) and one or more bipolar electrodes (18) disposed between the anode and the cathode so as to form interpolar spaces (16) in which electrolysis occurs. In the electrode assembly, the bipolar electrode (if there is only one) or the innermost bipolar electrode (if there are more than one) substantially surrounds the anode and forms a single mechanical and electrical entity. The cathode in turn preferably substantially surrounds the one or more bipolar electrodes. The electrode assembly comprising the cathode and bipolar electrode(s) is preferably unitary, forming an electrode cassette that can be assembled outside a cell and then introduced into, or withdrawn from, the cell as a single self-supporting unit. Structures of this kind simplify cell fabrication and may lead to cells that operate with improved efficiency.

L'invention concerne une cellule électrolytique pour récupérer un métal d'un électrolyte fondu et un système d'électrodes pour une telle cellule. La cellule (10) comprend un système d'électrodes constitué d'une anode (17), d'une cathode (19) et d'une ou de plusieurs électrodes bipolaires (18) disposées entre l'anode et la cathode de manière à former des espaces interpolaires (16) dans lesquels a lieu l'électrolyse. Dans le système d'électrodes, l'électrode bipolaire (quand il n'y en a qu'une) entoure sensiblement l'anode et forme une seule entité mécanique et électrique. Quant à la cathode, elle entoure sensiblement, de préférence, la ou les électrodes bipolaires. Le système d'électrodes comprenant la cathode et la ou les électrodes bipolaires est de préférence unitaire et constitue une cassette d'électrodes qui peut être assemblée en dehors de la cellule et ensuite introduite dans ou extraite de la cellule en tant qu'unité autonome. Les structures de ce type simplifient la fabrication des cellules et peuvent fournir des cellules qui fonctionnent avec une efficacité accrue.

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