Recycling of rare earth metals from rare earth-transition metal alloy scrap by liquid metal extraction
Patent
·
OSTI ID:87775
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.
- Research Organization:
- Iowa State University
- DOE Contract Number:
- W-7405-ENG-82
- Assignee:
- Iowa State Univ. Research Foundation, Inc., Ames, IA (United States)
- Patent Number(s):
- US 5,437,709/A/
- Application Number:
- PAN: 8-280,440
- OSTI ID:
- 87775
- Country of Publication:
- United States
- Language:
- English
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