Silicon purification method using copper or copper-aluminum solv

Details Silicon purification method using copper or copper-aluminum solv Silicon purification method using copper or copper-aluminum solv

1982-05-05

1989-04-18

Lacey, David L.

Chemistry of inorganic compounds

Silicon or compound thereof

Elemental silicon

23295R, 23297, 23299, 156DIG64, B01D 900

Patent

active

048225851

ABSTRACT:
A method for purifying silicon comprises the steps of providing a body of molten silicon-rich material in a solvent metal comprising copper or copper-aluminum combination 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 comprising copper or copper-aluminum solvent metal, including impurities, from the crystals, and at least one fraction of the remelted material is separated from the crystals.

REFERENCES:
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patent: 3008887 (1958-10-01), Herglotz
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patent: 4312849 (1982-01-01), Kramer
patent: 4379777 (1983-04-01), Boulds
"Crystallization of Pure Silicon from Molten Aluminum", presented at the Second Joint AICheE Meeting, May 19-22, 1968, (preprint 37B).

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