| 摘要 |
Disclosed is a method for purifying silicon metal wherein a silicon metal containing not less than 1,000 ppm by weight but not more than 10,000 ppm by weight of aluminum and having a silicon concentration of not less than 98% by weight but not more than 99.9% by weight is prepared, and the silicon metal is heated to and maintained for a certain time at a temperature not less than 1,500°C but not more than 1,600°C in an inert atmosphere at a pressure of not less than 100 Pa but not more than 1,000 Pa.
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