Process for removal of metalic impurities from magnesium by...

C - Chemistry – Metallurgy – 22 – B

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C22B 26/22 (2006.01)

Patent

CA 1191699

PRECIS DE LA DIVULGATION: L'invention concerne un procédé d'élimination des impuretés métalliques dans le magnésium, et notamment du fer, du silicium et du manganèse. Ce procédé est carac- térisé en ce qu'on injecte dans le magnésium fondu un dérivé halogéné de bore, tel que BCl3, à raison de 0,05 à 5 kg de bore pur par tonne de magnésium. On peut, préala- blement, procéder à un affinage au TiCl4 ou avec un mélan- ge TiCl4 + FeCl3. Le magnésium obtenu par un tel procédé contient moins de 1 ppm de bore résiduel, moins de 20 ppm, de Fe et Si, et moins de 30 ppm de Mn.

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