Molten salt bath circulation design for an electrolytic cell

C - Chemistry – Metallurgy – 25 – C

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C25C 3/08 (2006.01) C25C 7/00 (2006.01)

Patent

CA 2367634

An electrolytic cell (10) for reduction of a metal oxide to a metal and oxygen has an inert anode (29a,b,c) and an upwardly angled roof (40) covering the inert anode. The angled roof diverts oxygen bubbles into an upcomer channel (34), thereby agitating a molten salt bath in the upcomer channel and improving dissolution of a metal oxide in the molten salt bath. The molten salt bath has a lower velocity adjacent the inert anode in order to minimize corrosion by substances in the bath. A particularly preferred cell produces aluminum by electrolysis of alumina in a molten salt bath containing aluminum fluoride and sodium fluoride.

La présente invention concerne une cuve d'électrolyse (10) permettant de réduire un oxyde métallique en un métal et en oxygène, qui possède une anode permanente (29a, b, c) et un couvercle incliné vers le haut (40) recouvrant cette anode. Ce couvercle incliné dévie les bulles d'oxygène vers un canal de remonté (34), agitant ainsi un bain de sels fondus dans ce canal de remonté et améliorant la dissolution d'un oxyde métallique présent dans ce bain. Ce bain de sels fondus a une vitesse de passage plus faible près de l'anode de façon à minimiser la corrosion par les substances du bain. Un mode de réalisation préféré de l'invention concerne une cuve qui produit de l'aluminium par électrolyse d'alumine dans un bain de sels fondus contenant du fluorure d'aluminium et du fluorure de sodium.

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