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Method using selected carbons to react with Al2O and Al vapors in the carbothermic production of aluminum

United States Patent

February 1, 2005
View the Complete Patent at the US Patent & Trademark Office
In a method for recovering Al from an off-gas (3,4) produced during carbothermic reduction of aluminum utilizing at least one smelter (1,2), the off-gas (3,4) is directed to an enclosed reactor (5) which is fed a supply of wood charcoal (7) having a porosity of from about 50 vol. % to 85 vol. % and an average pore diameter of from about 0.05 .mu.m to about 2.00 .mu.m, where the wood charcoal (7) contacts the off-gas (3,4) to produce at least Al.sub.4 C.sub.3 (6), which is passed back to the smelter (1,2).
Fruehan; Richard J. (Murrysville, PA), Li; Yun (Murrysville, PA), Carkin; Gerald (Tarentum, PA)
Alcoa Inc. (Pittsburgh, PA), Elkem ASA (Oslo, NO), Carnegie Mellon University (Pittsburgh, PA)
10/ 728,512
December 4, 2003
GOVERNMENT CONTRACT The Government of the United States of America has rights in this invention, pursuant to Contract No. DE-FC07-00ID-13900 with the United States Department of Energy.