Process of melting down and purifying silicon

Details Process of melting down and purifying silicon Process of melting down and purifying silicon

1978-01-25

1979-04-24

Cooper, Jack

Chemistry of inorganic compounds

Silicon or compound thereof

Elemental silicon

423111, 423155, 23308R, C01B 3302

Patent

active

041512642

ABSTRACT:
A process of melting down and purifying silicon, which comprises melting silicon in at least half of the amount up to double of the amount of a silicate melt heated by resistance heating up to a temperature of at least 1,420.degree. C., said melt consisting of 2-30% by weight of calcium oxide, 5-35% by weight of magnesium oxide, wherein the sum of calcium oxide and magnesium oxide will be 15-38% by weight, 0.5-28% by weight of aluminum oxide and 45-70% by weight of silicon dioxide, and wherein, to the melt are added at least 0.29% by weight of elementary and/or chemically bound copper, preferably 0.50-3% by weight, calculated on the silicon amount.

REFERENCES:
patent: 1180968 (1916-04-01), Brockbank
patent: 3148131 (1964-09-01), Coursier et al.
patent: 3871872 (1975-03-01), Downing et al.

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