Process for removing alkali-metal impurities from molten...

Details Process for removing alkali-metal impurities from molten... Process for removing alkali-metal impurities from molten...

C - Chemistry, Metallurgy

22

B

53/246

C22B 21/06 (2006.01) C22B 9/05 (2006.01)

Patent

CA 1046286

PROCESS FOR REMOVING ALKALI-METAL IMPURITIES FROM MOLTEN ALUMINUM ABSTRACT A process for removing alkali metal impurities from molten aluminum while avoiding the emission of environ- mentally harmful gases and fumes. The process comprises introducing a sparging gas comprising a mixture of an inert gas and a gas selected from the group consisting of chlorine, fluorine, halogen-containing compounds and mixtures thereof into unalloyed molten aluminum while maintaining the concen- tration of halogen in the sparging gas at a value intended to selectively halogenate the alkali metal impurities at a sufficiently high utilization such that the concentration of chloride in the effluent gas is maintained below a pre- determined permissible limit.

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