Process and apparatus for obtaining silicon from fluosilicic aci

Details Process and apparatus for obtaining silicon from fluosilicic aci Process and apparatus for obtaining silicon from fluosilicic aci

1985-11-26

1988-05-31

Doll, John

Chemistry of inorganic compounds

Silicon or compound thereof

Elemental silicon

423342, 423490, C01B 3302

Patent

active

047480149

ABSTRACT:
Process for producing low cost, high purity solar grade Si wherein a reduction reaction, preferably the reduction of SiF.sub.4, by an alkali metal (Na preferred) is carried out inside a reaction chamber. The chamber wall and bottom surfaces are configured so as to facilitate the continuous separation of the products of reaction (Si and NaF) and removal of the molten salt by discharging the salt through one or more ports at the bottom of the reaction chamber. Such process is especially useful where it is desirable to discharge the reaction salt products from the reactor and retain silicon within the chamber for later removal.

REFERENCES:
patent: 4233338 (1980-11-01), Ricard et al.
patent: 4388286 (1983-06-01), Kapur et al.
patent: 4442082 (1984-04-01), Sanjurjo
patent: 4446120 (1984-05-01), Schmidt et al.
patent: 4529576 (1985-06-01), Sancier
patent: 4563976 (1986-01-01), Foell et al.
patent: 4563979 (1986-01-01), Falckenberg et al.

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