Method for treating rare earth-transition metal scrap [electronic resource].

Published: Ames, Iowa : Ames Laboratory, 1992.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Additional Creators: Ames Laboratory and United States. Department of Energy. Office of Scientific and Technical Information

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Summary

Rare earth-transition metal (e.g., iron) scrap (e.g., Nd-Fe-B scrap) is flux (slag) remelted to reduce tramp non-metallic impurities, such as oxygen and nitrogen, and metallic impurities, such as Li, Na, Al, etc., picked up by the scrap from previous fabrication operations. The tramp impurities are reduced to concentrations acceptable for reuse of the treated alloy in the manufacture of end-use articles, such as permanent magnets. The scrap is electroslag or inductoslag melted using a prefused, rare earth fluoride-bearing flux of CaF.sub.2, CaCl.sub.2 or mixtures thereof or the slag resulting from practice of the thermite reduction process to make a rare earth-iron alloy.

Report Numbers

E 1.99:us 5174811
us 5174811

Other Subject(s)

Method Treating Rare Earth-Transition Metal Scrap Rare Earth-Transition Metal Iron Scrap Nd-Fe-B Scrap Flux Slag Remelted Reduce Tramp Non-Metallic Impurities Oxygen Nitrogen Metallic Impurities Na Etc Picked Scrap Previous Fabrication Operations Tramp Impurities Reduced Concentrations Acceptable Reuse Treated Alloy Manufacture End-Use Articles Permanent Magnets Scrap Electroslag Inductoslag Melted Prefused Rare Earth Fluoride-Bearing Flux Caf Cacl Mixtures Slag Resulting Practice Thermite Reduction Process Rare Earth-Iron Alloy Metallic Impurities Metallic Impurities Rare Earth-Iron Permanent Magnet Transition Metal Transition Metal Rare Earth Rare Earth Rare Earth Rare Earth Permanent Magnets Reduction Process Earth-Transition Metal Earth-Transition Metal Rare Earth-Transition Rare Earth-Transition Thermite Reduction Metal Scrap Earth-Iron Alloy Tramp Impurities Nd-Fe-B Scrap Treating Rare Iron Alloy

Note

Published through SciTech Connect.
12/29/1992.
"us 5174811"
"US patent application 07/591,040"
Schmidt, Frederick A.; Peterson, David T.; Wheelock, John T.; Jones, Lawrence L.

Funding Information

W-7405-ENG-82

View MARC record | catkey: 14065417

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Method for treating rare earth-transition metal scrap [electronic resource].

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