Carbothermic reduction and prereduced charge for producing alumi

Details Carbothermic reduction and prereduced charge for producing alumi Carbothermic reduction and prereduced charge for producing alumi

1983-03-07

1985-01-01

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 68R, C22B 400, C22B 2100

Patent

active

044914725

ABSTRACT:
Disclosed is a method for the carbothermic reduction of aluminum oxide to form an aluminum alloy including producing silicon carbide by heating a first mix of carbon and silicon oxide in a combustion reactor to an elevated temperature sufficient to produce silicon carbide at an accelerated rate, the heating being provided by an in situ combustion with oxygen gas, and then admixing the silicon carbide with carbon and aluminum oxide to form a second mix and heating the second mix in a second reactor to an elevated metal-forming temperature sufficient to produce aluminum-silicon alloy. The prereduction step includes holding aluminum oxide substantially absent from the combustion reactor. The metal-forming step includes feeding silicon oxide in a preferred ratio with silicon carbide.

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patent: 4299619 (1981-11-01), Cochran et al.
patent: 4334917 (1982-06-01), Kibby
"Carbothermic Smelting of Aluminum", P. T. Stroup, Transactions of the Metallurgical Society of AIME, Apr., 1964.
"Reaction of Clay and Carbon to Form and Separate Al.sub.2 O.sub.3 and SiC", B. C. Bechtold and I. B. Cutler, J. Am. Cer. Soc. May/Jun. 1980.
"Reductio ad Aluminium", Far Eastern Economic Review, Jun. 18, 1982.

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