Purification of metallurgical grade silicon

Details Purification of metallurgical grade silicon Purification of metallurgical grade silicon

C - Chemistry, Metallurgy

01

B

204/96.31

C01B 33/00 (2006.01) C01B 33/037 (2006.01)

Patent

CA 1147698

ABSTRACT OF THE DISCLOSURE There is disclosed a process for preparing ultra pure silicon from metallurgical grade silicon, which comprises (a) continuously passing powdered and acid- leached metallurgical grade silicon through an induction plasma; (b) quenching said treated particles whereby upon solidification of the molten particles, a portion of the impurities therein migrates to the surface of the granules obtained; (c) acid leaching the surface impurities of the granules obtained in step (b); and (d) after drying the granules obtained, repeating steps (a), (b) and (c) until a silicon of the desired purity is obtained.

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