Removal of impurities from molten aluminium

Details Removal of impurities from molten aluminium Removal of impurities from molten aluminium

C - Chemistry, Metallurgy

22

B

53/247

C22B 21/06 (2006.01)

Patent

CA 1215236

A B S T R A C T Ti and V impurities are removed from molten aluminium by adding a boron-bearing substance and agitating the aluminium in the presence of a dispersed chloride and/or fluoride flux active for fluxing (Ti,V)B2 particles. It is preferred to perform the process by stirring the molten aluminium to generate a vortex, into which aluminium fluoride is introduced as a fluxing agent and for reaction with any alkali metal impurity present in the molten metal. The alkali metal fluoaluminate thus generated assists the fluxing of the (Ti,V)B2, as does any cell electrolyte present in the molten aluminium.

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