Addition of calcium compounds to the carbothermic reduction...

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

C - Chemistry, Metallurgy

01

B

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C01B 31/36 (2006.01) C01B 33/025 (2006.01)

Patent

CA 1288214

ADDITION OF CALCIUM COMPOUNDS TO THE CARBOTHERMIC REDUCTION OF SILICA 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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