Bibliographic Citation
| US 5,437,709/A/ | |
| Recycling of rare earth metals from rare earth-transition metal alloy scrap by liquid metal extraction Loading...
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| 08/01/1995 | |
| PAN: US patent application 8-280,440 | |
| Ellis, T.W.; Schmidt, F.A. | |
| Iowa State University | |
| W-7405-ENG-82 | |
| 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; SCRAP METALS; MELTING; EXTRACTION; RARE EARTHS; MATERIALS RECOVERY; MAGNESIUM; SOLVENT PROPERTIES; CALCIUM; BARIUM; LIQUID METALS; DISSOLUTION; VACUUM DISTILLATION | |
| Iowa State Univ. Research Foundation, Inc., Ames, IA (United States) | |
| A method is described for treating rare earth metal-bearing scrap, waste or other material (e.g. Nd--Fe--B or Dy--Tb--Fe scrap) to recover the rare earth metal comprising melting the rare earth metal-bearing material, melting a Group IIA metal extractant, such as Mg, Ca, or Ba, in which the rare earth is soluble in the molten state, and contacting the melted material and melted extractant at a temperature and for a time effective to extract the rare earth from the melted material into the melted extractant. The rare earth metal is separated from the extractant metal by vacuum sublimation or distillation. 2 figs. | |
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