Method of removal of light metals from aluminum

Details Method of removal of light metals from aluminum Method of removal of light metals from aluminum

C - Chemistry, Metallurgy

22

B

C22B 21/06 (2006.01) F27D 27/00 (2010.01) C22B 9/10 (2006.01)

Patent

CA 2272976

Improved apparatus and method are described for the removal of light metals; sodium, lithium, calcium and magnesium, from virgin aluminum tapped from a Hall Heroult reduction cell using LiF-modified or LiF + MgF2 electrolyte. The method is performed in a crucible or at a station intermediate between the cells and furnaces in a cast house. Fine particulate aluminum fluoride and/or sodium aluminum tetrafluoride are transported by a gas or gas mixture into the molten aluminum in a manner such that the light metals are preferentially removed or their concentration substantially lowered through: 1) the axle of a specially designed spinning impeller; 2) partially through the axle of a specially designed spinning impeller and partially through one or more pipes equipped with dispersers for dispersing into the molten metal flow close to the spinning impeller; or 3) through one or more pipes equipped with dispersers for dispersing into the molten metal flow close to the impeller fastened to a solid axle.

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