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Decarbonization process for carbothermically produced aluminum

United States Patent

June 30, 2015
View the Complete Patent at the US Patent & Trademark Office
A method of recovering aluminum is provided. An alloy melt having Al.sub.4C.sub.3 and aluminum is provided. This mixture is cooled and then a sufficient amount of a finely dispersed gas is added to the alloy melt at a temperature of about C. to about C. The aluminum recovered is a decarbonized carbothermically produced aluminum where the step of adding a sufficient amount of the finely dispersed gas effects separation of the aluminum from the Al.sub.4C.sub.3 precipitates by flotation, resulting in two phases with the Al.sub.4C.sub.3 precipitates being the upper layer and the decarbonized aluminum being the lower layer. The aluminum is then recovered from the Al.sub.4C.sub.3 precipitates through decanting.
Bruno; Marshall J. (Greensburg, PA), Carkin; Gerald E. (Tarentum, PA), DeYoung; David H. (Export, PA), Dunlap, Sr.; Ronald M. (Brackenridge, PA)
Alcon Inc. (Pittsburgh, PA)
12/ 334,687
December 15, 2008
GOVERNMENT FUNDING STATEMENT This invention was made with government support under Contract No. DE-FC36-001D13900, awarded by the U.S. Department of Energy. The government has certain rights in the invention.