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- W1551035776 abstract "This paper reports that as part of the U.S. Bureau of Mines program to reduce the Nation's reliance on foreign supplies for critical metals, a procedure was devised to separate and recover critical metals from mixed and contaminated superalloy scrap. The process uses both pyrometallurigical and hydrometallurgical, methods to treat the scrap. The mixed scrap is converted to a matte containing 4 to 7 pct S by adding S directly to the molten metal. This matte is then granulated and ground to a minus 35-mesh particle size and leached with an HCl-Cl{sub 2} solution. This process takes essentially all the Ni, Co, Cr, Fe, Al, and Mo into solution in a 3-h leach, leaving W, Ta, Ti, and Nb (Cb) in the residue. The Mo is recovered from the chloride leach solution by solvent extraction and the Cr and Fe are recovered together by precipitation. The Ni and Co can be recovered individually by an existing solvent extraction-electrowinning process. The W is recovered by a caustic leach of oxidized Cl{sub 2} leach residue." @default.
- W1551035776 created "2016-06-24" @default.
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- W1551035776 date "1991-01-01" @default.
- W1551035776 modified "2023-09-27" @default.
- W1551035776 title "Recovery of critical metals from superalloy scrap by matte smelting and hydrometallurgical processing" @default.
- W1551035776 hasPublicationYear "1991" @default.
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