Process for the production of silicon or ferrosilicon in an...

Details Process for the production of silicon or ferrosilicon in an... Process for the production of silicon or ferrosilicon in an...

C - Chemistry, Metallurgy

01

B

31/1, 23/325, 53

C01B 33/02 (2006.01) C01B 33/025 (2006.01) C22C 33/00 (2006.01) C22C 35/00 (2006.01)

Patent

CA 1252278

A B S T R A C T A process for the production of silicon in an electric low shaft furnace, in which raw-material blanks containing fine-grain silicon dioxide are formed first, e.g. in the form of sand, and carbon in excess in respect of the reduction to silicon carbide plus the raw-material blanks are introduced into the low shaft furnace as a charge in admixtures with silicon dioxide in lump form. The silicon dioxide in the raw-material blanks is reduced to silicon carbide in an upper part of the electric low shaft furnace at a temperature below 1600°C and coke structure agglomerates are formed from the excess carbon of the raw material blanks. In a lower part of the electric low shaft furnace, the silicon dioxide in lump form is reduced to silicon with silicon carbide and carbon from the coke structure agglomerates at a temperature above 1600°C, preferably from 1800 to 2000°C. The raw-material blanks are formed with bituminous binder containing a fine-particle silica powder. The silicon carbide reduction results in coke structure agglomerates having a very large internal carbon surface area, which is determined largely by the internal surface area and percentage proportion of silica powder in the raw-material blanks. The silicon dioxide and gaseous silicon monoxide are reduced by the coke structure agglomerates having the increased internal area.

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