Treating aluminium with chlorine

Details Treating aluminium with chlorine Treating aluminium with chlorine

1991-02-19

1992-09-08

Andrews, Melvyn J.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

420542, C22B 2106

Patent

active

051455145

ABSTRACT:
When molten aluminium is treated with chlorine to remove alkali and alkaline earth metals and hydrogen, there is formed a brittle oxide crust which does not protect the metal from oxidation. This problem is solved by admixing with the chlorine a minor proportion of a gaseous compound of fluorine, preferably sulphur hexafluoride, which can form alkali or alkaline earth metal fluorides in the presence of molten aluminium. The proportion of sulphur hexafluoride to chlorine gas is preferably from 0.01 to 1.0. Ingots cast using the treated metal are free of oxide patches on their surface.

REFERENCES:
patent: 1896201 (1933-02-01), Sterner-Rainer
patent: 3958980 (1976-05-01), Szekely
patent: 4354869 (1982-10-01), Hummer et al.
patent: 4392888 (1983-07-01), Eckert et al.
Kastner et al., "Raffination von Huttenaluminium . . . ", Raffinationsverfahren Metall., Int. Symp. 1983, pp. 35-54.

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