Method for production of pure silicon

Details Method for production of pure silicon Method for production of pure silicon

1984-02-06

1985-09-03

Dixon, Jr., William R.

Chemistry of inorganic compounds

Silicon or compound thereof

Elemental silicon

C01B 3302

Patent

active

045391947

ABSTRACT:
Pure silicon metal is produced from a silicon metal which contains 1-10% Ca and which is cast into molds with relatively slow rate of cooling. The cast metal is pre-crushed and thereupon subjected to a purification process consisting of two leaching steps where in the first leaching step there is employed an aqueous solution of FeCl.sub.3 or FeCl.sub.3 +HCl which causes a disintegration of the metal. The fines are washed away in place thereof, and the metal is further leached in the second leaching step with an aqueous HF+HNO.sub.3 solution. The necessary amount of calcium is supplied in the smelting furnace in the form of CaO or other suitable Ca compound.

REFERENCES:
patent: 2885364 (1959-05-01), Swartz
patent: 3809548 (1974-05-01), Aas et al.
patent: 4241037 (1980-12-01), Pelosini et al.
patent: 4379777 (1983-04-01), Boulos

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