Process for the preparation of silicon or ferrosilicon

Details Process for the preparation of silicon or ferrosilicon Process for the preparation of silicon or ferrosilicon

1979-05-24

1981-05-26

Andrews, M. J.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

423350, 75134S, C21C 552

Patent

active

042696208

ABSTRACT:
A process for the production of silicon or ferrosilicon by reduction of silicon oxide, optionally in the presence of iron oxide, by means of a carbonaceous reducing agent in a reduction furnace. The furnace operation is simplified and the yield is increased by making the supply of energy and the supply of silicon oxide, respectively, independent of each other and by adjusting the ratio between them in such a manner that the gases leaving the furnace have a silicon monoxide content below 10 mole percent. A controlled supply of at least a part of the silicon oxide to the hotter parts of the furnace can be used as a means of making the supply of energy and the supply of silicon oxide reciprocally adjustable.

REFERENCES:
patent: 3660298 (1972-05-01), McClincy et al.
patent: 3887359 (1975-06-01), Enger et al.

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