<p>An improved process for producing high purity silicon results from the reaction of sodium with pure silicon tetrafluoride gas, which produces sodium fluoride as a by-product. The silicon tetrafluoride gas is formed by decomposing sodium fluorosilicate. The sodium fluorosilicate is produced by precipitation when fluorosilicic acid (FSA) is reacted with the by-product sodium fluoride in closed loop process. Likewise, the fluorosilicic acid is preferably formed at high purity using a source material that consists essentially of silica by reacting the by-product sodium fluoride with an acid to create reactive fluoride ions.</p>
申请公布号
WO2009129458(A2)
申请公布日期
2009.10.22
申请号
WO2009US40949
申请日期
2009.04.17
申请人
CIRCULON HUNGARY LTD.;NANIS, LEONARD;YUAN, SHI;FORKIN, MATTHEW