Thermal reduction process of aluminium

Details Thermal reduction process of aluminium Thermal reduction process of aluminium

1977-10-18

1979-03-27

Andrews, M. J.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 68R, C22D 702

Patent

active

041463897

ABSTRACT:
The thermal reduction process for producing metals such as aluminum in a reactor utilizes a dispersed discharge to provide the heat of reaction within the reaction zone in the presence of aluminum vapor to maintain the temperature in excess of 2000.degree. C. The aluminum oxide powder and a reductant in a gaseous medium are introduced with a tangential component into the reactor to create a vortex motion. A minimum turbulence level within the reactor in the reaction zone is maintained so as to keep the solid particles in suspension and prevent the dispersed discharge from forming electrical arcs. Aluminum oxide is reduced to aluminum vapor which is removed with the effluent stream of gases from the reaction zone. Thereafter, the effluent is rapidly passed through a condenser where the temperature is dropped to liquefy the aluminum vapor which is then discharged in a continuous stream. The effluent stream is monitored for unreacted carbon or aluminum oxide and this information is fed back to the reactor for controlling the input of the starting materials.

REFERENCES:
patent: 3232746 (1966-02-01), Karlovitz
patent: 3390979 (1968-07-01), Greene
patent: 3607221 (1971-09-01), Kibby
patent: 3765870 (1973-10-01), Fey et al.
patent: 3843351 (1974-10-01), Smith et al.
patent: 3893845 (1975-07-01), Mahaffey et al.

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