PROCESSES AND APPARATUSES FOR PRODUCING SILICON
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United States of America Patent
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Apr 5, 2012
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Nov 6, 2009
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Abstract
Processes or apparatuses for producing silicon by a carbon reduction in an arc furnace using a raw silica material having an iron content, an aluminum content, a calcium content, and a titanium content of 0.1% by mass or less, respectively and using a carbon material, wherein during the carbon reduction, an overcurrent which flows through an electrode of the arc furnace is mitigated using a power regulation unit or that the arc furnace is operated at a hearth power density PD (W/cm2) of 90 (W/cm2) or higher.
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