Addition of calcium compounds to the carbothermic reduction of s

Details Addition of calcium compounds to the carbothermic reduction of s Addition of calcium compounds to the carbothermic reduction of s

1986-12-22

1989-01-17

Stoll, Robert L.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

423350, C01B 3302

Patent

active

047986590

ABSTRACT:
What is described is an improvement to a process for the preparation of silicon from the reduction of silicon dioxide with a solid carbonaceous reducing agent, the improvement comprising feeding calcium compounds into the reaction zone of a silicon furnace, and controlling and maintaining a desired calcium level in the reaction zone of the silicon furnace. The calcium compounds may be fed to the silicon furnace as a constituent of either the silicon dioxide or solid carbonaceous reducing agent feeds, as a separate feed, or as a combination of two or more of these feeds.
Also described is an improvement to a process for the preparation of silicon carbide from the reduction of silicon dioxide with a solid carbonaceous reducing agent.

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Khalafalla and Hass, J. of American Ceramic, Society, 55:8(1972), pp. 414-417.
Henderson and Gutowski, Thermochimica Acta, 99(1986), pp. 309-316.

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