Societe Francaise D'electrometallurgie Sofrem

Andre Mena

Louis Septier

Rene Bonfils

Jean-Michel Charriere

Jean Desbrest

Christian Payn

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.

Process for eliminating metallic impurities from magnesium by injecting

This invention relates to the thermal production of magnesium, using, as source of magnesium oxide, a residual slag from the manufacture of certain carbon-containing chrome irons and, as reducing agent, a ferro-silico-aluminum for carrying out the MAGNETHERM process. Magnesium is obtained with a high degree of purity and in excellent yields, with the recovery of a residual alloy containing chromium and silicon, and the production capacity of a given furnace is increased by about 16% compared with that obtained when using calcined dolomite.

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Saint Beat, France

Andre Mena