Process for purifying silicon, and the silicon so produced

Details Process for purifying silicon, and the silicon so produced Process for purifying silicon, and the silicon so produced

C - Chemistry, Metallurgy

01

B

23/325

C01B 33/00 (2006.01) C01B 33/037 (2006.01)

Patent

CA 1133681

ABSTRACT OF THE DISCLOSURE: A process is disclosed for purifying silicon wherein silicon in the molten state is reacted with barium carbonate and/or oxide and/or hydroxide and then, after cooling and crushing, leached with one or more dilute inorganic acids. Preferably an oxidizing gas such as oxygen or water vapor is blown into the molten mass during the reaction, which is con- ducted at a temperature in the range of from 1550° to 2000°C. The inorganic acid may be for example hydrochloric acid, hydro- fluoric acid, nitric acid, sulphuric acid, or mixtures thereof.

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