Removal of alkali metals and alkaline earth metals from...

Details Removal of alkali metals and alkaline earth metals from... Removal of alkali metals and alkaline earth metals from...

C - Chemistry, Metallurgy

22

B

39/104, 53/249

C22B 21/06 (2006.01) F27D 27/00 (2010.01)

Patent

CA 1215237

A B S T R A C T For removing contaminant alkali- and alkaline earth metal contaminants, particularly Li, a particulate aluminium fluoride-containing material is introduced into a vortex established in a non-cylindrical body of molten aluminium contained in a vessel. The generation of the vortex establishes currents having both downward and lateral components at the bottom of the vortex and upwardly spiralling currents at the periphery of the vessel, which serve to recirculate suspended matter. The stirring of the molten metal is continued until the contaminant level is reduced to a desired level and then the molten Al is separated from the reaction products. The body of metal is contained in a vessel which is non- cylindrical and/or has its axis inclined to the vertical.

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