Method for separating solid reaction products from silicon produ

Details Method for separating solid reaction products from silicon produ Method for separating solid reaction products from silicon produ

1985-04-23

1987-02-17

Castel, Benoit

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210774, 210807, 210290, 210773, 423348, 156608, 156617SP, 156DIG64, B01D 3700, C01B 3302

Patent

active

046438335

ABSTRACT:
In a method for separating solid reaction products from silicon produced in an arc furnace, molten silicon produced in the arc furnace in a reduction of SiO.sub.2 and carbon is filtered through a heated layer composed of SiC/Si after a so-called holding phase at a temperature in a region above a melting point of the silicon. The layer is preferably fashioned as a bottom plate of a crucible. The melt has eliminated from it SiO.sub.2 and SiC particles contained therein. The method serves for the production of silicon for solar cells. Due to the separation of SiO.sub.2 and SiC out of the molten silicon, an efficiency of above 10% is achieved in the solar cells fabricated from this material.

REFERENCES:
patent: 4366024 (1982-12-01), Ast et al.
patent: 4388080 (1983-06-01), Kapur et al.
patent: 4388286 (1983-06-01), Kapur et al.
patent: 4515600 (1985-05-01), Dietl et al.
patent: 4539194 (1985-09-01), Halvorsen

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