Method for producing high purity silicon
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United States of America Patent
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Nov 10, 2009
Grant Date -
Oct 2, 2008
app pub date -
Feb 28, 2006
filing date -
Mar 7, 2005
priority date (Note) -
Expired
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Abstract
An object of the invention is to provide a method for producing a large amount of inexpensive high purity silicon useful for a solar battery. Disclosed is a method for producing high purity silicon by migrating impurities in silicon to slag including performing a first slag purification of a first silicon, separating the slag from the first silicon after finishing the first slag purification, and feeding the separated slag to a second molten silicon in a second purification of the second silicon, wherein purity of said second silicon prior to purification is lower than purity of the first silicon after purification.
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