Method for refining of silicon

Details Method for refining of silicon Method for refining of silicon

1997-05-08

1998-08-04

Bos, Steven

Chemistry of inorganic compounds

Silicon or compound thereof

Elemental silicon

117 78, 117 80, C01B 3302

Patent

active

057889457

ABSTRACT:
The present invention relates to a process for removing impurities from molten silicon by treatment of molten silicon contained in a vessel with a slag having the capability of removing the impurities, particularly boron from molten silicon wherein slag is continuously or substantially continuously added to the molten silicon and that the slag is continuously or substantially continuously inactivated or removed from the silicon melt as soon as equilibrium between the slag and molten silicon is reached with respect to the impurity elements or element to be removed.

REFERENCES:
patent: 4312848 (1982-01-01), Dawless
patent: 4388286 (1983-06-01), Kapur et al.
patent: 4643833 (1987-02-01), Aulich et al.
patent: 4828814 (1989-05-01), Sanjurjo et al.
patent: 5182091 (1993-01-01), Yuge et al.
Chemical Abstracts, vol. 89, No. 8, 63030t, Aug. 21, 1978.
K. Suzuki and N. Sano, Thermodynamics for Removal of Boron From Metallurgical Silicon by Flux Treatment, Apr. 1991, pp. 273-275.

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