Process for removing alkali-metal impurities from molten aluminu

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

1974-11-08

1976-05-25

Andrews, M. J.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 93E, C22B 2106

Patent

active

039589803

ABSTRACT:
A process for removing alkali metal impurities from molten aluminum while avoiding the emission of environmentally 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 therefor into unalloyed molten aluminum while maintaining the concentration 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 predetermined permissible limit.

REFERENCES:
patent: 3839019 (1974-10-01), Bruno et al.

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