Process for eliminating metallic impurities from magnesium by in

Details Process for eliminating metallic impurities from magnesium by in Process for eliminating metallic impurities from magnesium by in

1982-11-02

1983-11-29

Andrews, M. J.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 67A, C22B 2622

Patent

active

044179200

ABSTRACT:
The invention concerns a process for eliminating metallic impurities from magnesium, in particular iron, silicon and manganese.
For that purpose, a halogenated derivative of boron such as BCl.sub.3 is injected into the molten magnesium, in a proportion of from 0.05 to 5 kg of pure boron per tonne of magnesium. The magnesium may first be subjected to a refining operation using TiCl.sub.4 or a mixture comprising TiCl.sub.4 +FeCl.sub.3.
The magnesium produced contains less than 1 ppm of residual boron, less than 20 ppm of Fe and Si and less than 30 ppm of Mn.

REFERENCES:
patent: 3843355 (1974-10-01), Reding

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