Process and apparatus for obtaining silicon from fluosilicic...

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

C - Chemistry, Metallurgy

01

B

23/326, 148/1.4

C01B 33/02 (2006.01)

Patent

CA 1241895

ABSTRACT OF INVENTION Process and apparatus for producing low cost, high purity solar grade silicon ingots in single crystal or quasi single crystal ingot form in a substantially continuous operation in a two stage reactor starting with sodium fluosilicate and a metal more electropositive than silicon (prefer- ably sodium) in separate compartments having easy vapor transport therebetween and thermally decom- posing the sodium fluosilicate to cause formation of substantially pure silicon and a metal fluoride which may be continuously separated in the melt and silicon may be directly and continu- ously cast from the melt.

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