Method for producing aluminium

Details Method for producing aluminium Method for producing aluminium

C - Chemistry, Metallurgy

25

C

53/246

C25C 3/24 (2006.01) C22B 21/06 (2006.01)

Patent

CA 1235909

ABSTRACT A method of purifying aluminum contaminated with cerium or other rare earth metal comprises bringing the molten metal into contact with a halogenating agent. Preferred halogenating agents are aluminium fluoride for reducing cerium levels to around 0.1% to 0.3%, and chlorine gas for reducing cerium levels still further, and these may advantageously be used in sequence. Particulate aluminium fluoride may be introduced into the vortex of a stirred body of the molten metal. The controlled addition of chlorine may be effected by bubbling a mixture of chlorine and an inert gas into a body of the molten metal. The cerium contamination may arise from the use of a dimensionally stable anode comprising cerium dioxide in an aluminium reduction cell.

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