Carbothermic reduction furnace

Details Carbothermic reduction furnace Carbothermic reduction furnace

1980-04-16

1982-06-15

Andrews, M. J.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 68A, C22B 2102

Patent

active

043349170

ABSTRACT:
A carbothermic reduction process is described for producing alumina metal containing about 10% Al.sub.4 C.sub.3. The process heats a descending charge by radiation at a rate of heat flux of 10-100 KW/sq. inch, to form a melt surface that is spaced from an open arc between a pair of electrodes. Additional alumina beyond the stoichiometric amount is preferably introduced into the reduction zone immediately surrounding the melt surface.
A large moving-bed shaft furnace is utilized. This furnace comprises hearth shoulders and preferably also comprises alumina introduction ports and a charge shaping device that cooperatively interacts with the hearth shoulders to suspend the descending charge column above a pool of melted aluminum product therebeneath, whereby the aluminum product is able to flow and/or fall into the pool with minimum passage over unreacted charge.

REFERENCES:
patent: 1739343 (1929-12-01), Baily
patent: 3723093 (1973-03-01), Shiba et al.
patent: 4146389 (1979-03-01), Karlovitz
patent: 4245822 (1981-01-01), Dewing

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