High purity silicon production system and production method

Details High purity silicon production system and production method High purity silicon production system and production method

2006-07-20

2011-10-18

Langel, Wayne (Department: 1736)

Chemistry of inorganic compounds

Silicon or compound thereof

Elemental silicon

C136S261000, C422S199000

Reexamination Certificate

active

08038973

ABSTRACT:
The present invention provides a high purity silicon production system and production method suitable for using inexpensive metallurgical grade metal silicon as a material and using the slag refining method to produce high purity silicon with a purity of 6N or more suitable for solar battery applications, in particular, high purity silicon with a boron content of at least not more than 0.3 mass ppm, inexpensively on an industrial scale, that is, a high purity silicon production system and production method using the slag refining method wherein a direct electromagnetic induction heating means having the function of directly heating the molten silicon in the crucible by electromagnetic induction is arranged outside the outside wall surface of the above crucible and the crucible is formed by an oxidation resistant material at least at a region where the molten silicon contacts the crucible inside wall surface at the time of not powering the direct electromagnetic induction heating means.

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Tanahashi, M. et al., Journal of the Mining and Materials Processing Institute of Japan, vol. 118, 2002, p. 497-p. 505.
Tanahashi, M., et al., “Resources and Materials,” Journal of the Mining and Materials Processing Institute of Japan, vol. 118, 2002, pp. 497-505 (partial translation).

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