C - Chemistry – Metallurgy – 01 – B
Patent
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.
508844
Lask Gert-Wilhelm
Nooden Robert A.
Borden Ladner Gervais Llp
International Minerals & Chemical Corporation
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