Low cost routes to high purity silicon and derivatives thereof
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United States of America Patent
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Jul 2, 2013
Grant Date -
Aug 25, 2011
app pub date -
Aug 6, 2009
filing date -
Aug 6, 2008
priority date (Note) -
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Abstract
The present invention is directed to a method for providing an agricultural waste product having amorphous silica, carbon, and impurities; extracting from the agricultural waste product an amount of the impurities; changing the ratio of carbon to silica; and reducing the silica to a high purity silicon (e.g., to photovoltaic silicon).
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