Process for refining crude magnesium
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United States of America Patent
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Feb 1, 1994
Grant Date -
N/A
app pub date -
Jan 21, 1993
filing date -
Jan 23, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a process for refining crude magnesium, and, in particular, the magnesium obtained by reducing the magnesium ore using iron-silicon. The process consists in treating the liquid magnesium with a metallic sulphide such as iron monosulphide, iron bisulphide or molybdenum bisulphide. The sulphides are contacted with the metallic bath which is agitated to promote the liquid-solid reactions and the formation of insoluble products which precipitate. This contacting is followed by decantation of the insoluble products and their separation from the refined magnesium. The process permits a significant reduction in the contents of calcium and silicon.
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