Method of refining Si

Details Method of refining Si Method of refining Si

2006-02-09

2010-02-16

Vanoy, Timothy C (Department: 1793)

Chemistry of inorganic compounds

Silicon or compound thereof

Elemental silicon

C423S348000, C423S350000

Reexamination Certificate

active

07662356

ABSTRACT:
The present invention provides a method of refining low purity Si by a slag, in particular removing B, which suppresses wear of the reaction vessel due to the slag and produces high purity Si used for solar battery materials etc. at a low cost, comprising adding SiO2and an alkali oxide or alkali carbonate as a slag material into molten Si to form a slag during which adding one or more types of materials among materials the same as the reaction vessel material used or ingredients included in the reaction vessel material into the slag so as to remove the impurities in the molten Si.

REFERENCES:
patent: 2005/0139148 (2005-06-01), Fujiwara et al.
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patent: 2003-238139 (2003-08-01), None
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patent: WO 03066523 (2003-08-01), None
Suzuki et al, “Thermodynamics for Removal of Boron from Metallurgical Silicon by Flux Treatment,” J. Japan Inst. Metals, vol. 54, No. 2, (1990), pp. 168-172 (w/ English language Abstract).

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