Plasma smelting process for silicon

Details Plasma smelting process for silicon Plasma smelting process for silicon

1985-12-26

1987-07-14

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

423350, C01B 3302

Patent

active

046800964

ABSTRACT:
What is disclosed is a process for preparing silicon using a gas plasma as a heat source. The process comprises (a) generating a gas plasma in a reactor utilizing a transferred arc plasma configuration in which a minimum of gas is utilized to form a plasma; (b) feeding silicon dioxide and a solid reducing agent directly into the reactor and to the plasma; (c) passing the plasma gas, the silicon dioxide, and the solid reducing agent into a reaction zone of the reactor; (d) recovering molten silicon and the gaseous by-products.

REFERENCES:
patent: 4377564 (1983-03-01), Dahlberg
patent: 4439410 (1984-03-01), Santen et al.
Muller et al., Scand. J. Metall., 1(1972), pp. 145-155.
Johannson and Eriksson, J. Electrochem. Soc.; Solid State Science and Technology, 131:2 (1984), pp. 365-370.
Coldwell and Roques, J. Electrochemical Soc., 124(11) (1977), pp. 1686-1689.
National Institute for Metallurgy Report No. 1895, "A Review of Plasma Technology with Particular Ref. to Ferro-Alloy Production", 4/14/77, p. 3.

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