Method for producing highly purified, granular silicium
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United States of America Patent
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Feb 21, 2006
Grant Date -
Mar 18, 2004
app pub date -
Nov 21, 2001
filing date -
Dec 21, 2000
priority date (Note) -
Expired
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Abstract
The invention relates to a method for producing granular silicon by thermal decomposition of a gas containing silicon in a fluidized bed, said decomposition occurring in the presence of free-flowing mobile elements. Preferably, said free-flowing mobile elements become devoid of silicon in a separate procedural step, said silicon being deposited during decomposition of gas containing silicon, by reacting with hydrogen halides, halogens, alkyl halogenides, aryl halogenides or combinations of halogen and/or hydrogen halide and/or oxidized mineral acids and/or by thermal treatment of said elements.
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