Metallurgical silicon containing phosphorus for the preparation of organohalogenosilanes
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United States of America Patent
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Feb 3, 1998
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N/A
app pub date -
Dec 15, 1995
filing date -
Jul 1, 1993
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Abstract
A metallurgical silicon is disclosed which contains substantially from 30 to 180 ppm of phosphorus comprised of a crystalline phase of primary silicon having a dissolved phosphorus content between 30 and 150 parts per million and intermetal phases whose global ratio is between 0.5 and 2%, wherein among the intermediary phases, the phase Si.sub.2 Al.sub.2 Ca does not exceed 0.3% of the total of the metallurgical silicon mass. The metallurgical silcon is used for the synthesis of alkyl or aryl halogenosilanes useful for the preparation of silicones.
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