Method and apparatus for electrolysing light metals

C - Chemistry – Metallurgy – 25 – C

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C25C 7/00 (2006.01) C25C 3/02 (2006.01) C25C 3/04 (2006.01)

Patent

CA 2242421

The present invention provides a new and useful process for the production of a molten metal by electrolysis in an electrolytic cell having an electrolysis section (16), a metal recovery section (18) and a submerged reservoir (68), said process comprising electrolysing in said electrolysis section of said cell an electrolyte containing a fused salt of said metal to produce said metal, said electrolyte having a greater density than said metal; causing said metal and additional said electrolyte to circulate continuously from said electrolysis section to said recovery section; continuously separating said metal from said electrolyte in said recovery section; causing said metal to circulate toward a part of said recovery section remote from said electrolysis section; conveying said metal from said recovery section to said submerged reservoir; and periodically recovering said metal from said reservoir.

La présente invention concerne un procédé nouveau et utile pour la production d'un métal fondu par électrolyse dans un cellule électrolytique ayant une section d'électrolyse (16), une section de récupération du métal (18) et un réservoir immergé (68). Ce procédé comprend l'électrolyse, dans la section d'électrolyse de la cellule, d'un électrolyte contenant un sel fondu du métal afin d'obtenir ce dernier. La densité de l'électrolyte est supérieure à celle du métal. Le procédé comprend aussi la circulation continue du métal et de l'électrolyte additionnel depuis la section d'électrolyse jusqu'à la section de récupération, la séparation continue du métal et de l'électrolyte dans la section de récupération, le déplacement du métal vers une partie de la section de récupération qui est éloignée de la section d'électrolyse, le transport du métal depuis la section de récupération jusqu'au réservoir immergé, et le prélèvement périodique de ce métal dans le réservoir.

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