Reduction of stable oxides

Details Reduction of stable oxides Reduction of stable oxides

C - Chemistry, Metallurgy

22

B

53/242

C22B 21/02 (2006.01) C22B 4/00 (2006.01) H05B 7/00 (2006.01) H05H 1/42 (2006.01)

Patent

CA 1093833

ABSTRACT OF THE DISCLOSURE In a process for the carbothermal reduction of alumina, carbon and alumina are supplied to a molten reaction bed in a hearth in the floor of a reactor. The reaction bed is supplied with energy by contact with plasma or with plasma effluents. For this purpose the reaction bed itself may form the counter- electrode for a plasma gun orbiting about the vertical axis of the reactor or there may be an intermediate counter-electrode. In either case the hearth is preferably electroconductive to provide current path from the material in the reaction bed. Some or all of the feed material entering the reaction bed may enter the upper end of the reactor and descend through the plasma. At least part of the carbon may be in the form of coarse lumps which are fed to the reactor via an entry duct in counter-current relation to evolved carbon monoxide which preheats and partially scrubs it.

285065

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