Method for removing boron from silicon
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United States of America Patent
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Oct 11, 2011
Grant Date -
Aug 9, 2007
app pub date -
Mar 2, 2005
filing date -
Mar 3, 2004
priority date (Note) -
Expired
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Abstract
The present invention provides a method for removal of boron from metal silicon inexpensively and extremely efficiently by a simple method, specifically, heating metal silicon containing boron as an impurity to its melting point to 2200° C. to place it in a molten state, then adding a solid mainly comprised of silicon dioxide and a solid mainly comprised of one or both of a carbonate of an alkali metal or a hydrate of a carbonate of an alkali metal into said molten silicon so as to form a slag and remove the boron in the silicon.
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