Method of silicon purification

Details Method of silicon purification Method of silicon purification

1980-09-09

1982-01-26

Cooper, Jack

Chemistry of inorganic compounds

Silicon or compound thereof

Elemental silicon

23295R, 23296, 156DIG64, 156DIG83, 422245, 422251, 422255, B01D 900, C01B 3302

Patent

active

043128467

ABSTRACT:
A method for purifying silicon comprises the steps of providing a body of molten silicon-rich material in a vessel having an upwardly removable first bottom therein and extracting heat therefrom to provide a solid phase containing silicon in crystal form and to concentrate impurities in a molten phase. After a desired amount of heat has been extracted, a substantial part of the molten phase is separated from the solid phase. A fraction or portion of the solid phase is remelted for purposes of removing solvent metal, including impurities, from the crystals, and at least one fraction of the remelted material is separated from the crystals. The crystals are removed from the vessel by upwardly withdrawing the removable bottom.

REFERENCES:
patent: 2471899 (1949-05-01), Regner
patent: 2651922 (1953-09-01), Graham
patent: 2866701 (1958-12-01), Strauss
patent: 3008887 (1961-11-01), Herglotz
patent: 3069240 (1962-12-01), Armand
patent: 3097068 (1963-07-01), Litz et al.
patent: 3933981 (1976-01-01), Wakefield et al.
patent: 4246249 (1981-01-01), Dawless
patent: 4256717 (1981-03-01), Dawless
Litz et al., "Second Joint AICheE Meeting", May 19-22, 1968 Preprint 37B.

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