Method for production of pure silicon

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

C - Chemistry, Metallurgy

01

B

23/327

C01B 33/02 (2006.01) C01B 33/037 (2006.01)

Patent

CA 1212816

ABSTRACT OF THE DISCLOSURE 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 FeC13 or FeC13 + HC1 which causes a disintegration of the metal. The fines are washed away and the metal is further leached in the second leaching step with an aqueous HF + HNO3 solution. The necessary amount of calcium is supplied in the smelting furnace in the form of CaO or other suitable Ca compound.

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