Recovery of aluminum from dross using the plasma torch
Patent 5135565 Issued on August 4, 1992. Estimated Expiration Date: 
April 16, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
April 16, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 1066833 3586613 3851136 Method for producing aluminum metal from its salts Reduction of stable oxides Recovery of non-ferrous metals from dross using plasma torch Recovery of free aluminum from aluminum dross using plasma energy without use of a salt flux Patent #: 4997476 InventorApplicationNo. 686094 filed on 04/16/1991US Classes:75/10.21, Producing or treating Aluminum(Al) or Aluminum alloy75/672Treating slag or drossExaminersPrimary: Rosenberg, Peter D.Attorney, Agent or FirmInternational ClassC22B 004/00AbstractA process and apparatus for recovering aluminum from a solid dross containing the same comprising: (a) continuously introducing the dross and lime flux into an inert gas DC transferred arc plasma torch furnace, (b) heating the mixture to above the slag melting point to form two immiscible layers, and (c) periodically removing the upper aluminum layer and the lower residual slag layer. | |
