Process of melting down and purifying silicon

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

C - Chemistry, Metallurgy

01

B

23/327

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

Patent

CA 1091426

ABSTRACT OF THE DISCLOSURE 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°C, said melt consisting of 2 - 30% by weight of cal- cium 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.

297071

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