Chemistry of inorganic compounds – Silicon or compound thereof – Elemental silicon
Patent
1981-10-13
1983-04-12
Peters, G.
Chemistry of inorganic compounds
Silicon or compound thereof
Elemental silicon
423350, 204164, C01B 3302
Patent
active
043797776
ABSTRACT:
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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G. Szeeyly, Preparation of Pure Silicon by the Hydrogen Reduction of Silicon Tetraiodide, J. of the Electrochemical Soc., 11/1957, pp. 663-667.
T. F. Ciszek et al., Solar-Grade Silicon by Directional Solidification in Carbon Crucibles, IBM J. Res. Develop., vol. 23, No. 3, 1979, pp. 270-277.
Peters G.
Universite de Sherbrooke
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