Aluminium electrowinning cell with enhanced crust

Details Aluminium electrowinning cell with enhanced crust Aluminium electrowinning cell with enhanced crust

C - Chemistry, Metallurgy

25

C

C25C 3/08 (2006.01) C25C 3/12 (2006.01)

Patent

CA 2643390

A cell for the electrowinning of aluminium has a cavity for containing electrolyte (20) and one or more non emerging active anode bodies (5) that are suspended in the electrolyte. The electrolyte's surface (21,21') has an expanse extending over the cavity and is substantially covered by a self-formed crust (25) of frozen electrolyte. The crust is mechanically reinforced by at least one preformed refractory body (30, 30',30") . The electrolyte crust is formed against the preformed refractory body and bonded thereto so as to inhibit mechanical failure of the crust and collapse of the crust into the cavity.

L'invention concerne une cellule destinée à l'extraction électrolytique d'aluminium et comprenant une cavité servant à contenir de l'électrolyte (20) et un ou plusieurs corps actifs (5) d'anode non émergents suspendus dans l'électrolyte. La surface (21,21') de l'électrolyte présente une étendue recouvrant la cavité et est sensiblement recouverte d'une croûte (25) formée spontanément d'électrolyte figé. Ladite croûte est renforcée mécaniquement par au moins un corps réfractaire préformé (30, 30',30'). La croûte d'électrolyte est formée contre ledit corps réfractaire préformé et collée à celui-ci de façon à s'opposer à une défaillance mécanique de la croûte et à l'effondrement de la croûte dans la cavité.

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