Recycling of rare earth metals from rare earth-transition metal

Details Recycling of rare earth metals from rare earth-transition metal Recycling of rare earth metals from rare earth-transition metal

1994-07-26

1995-08-01

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Producing or treating free metal

75594, C01F 1700

Patent

active

054377099

ABSTRACT:
Method of 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.

REFERENCES:
patent: 3634066 (1972-01-01), Matthews
patent: 5129945 (1992-07-01), Lyman et al.
patent: 5238489 (1993-08-01), Lyman et al.
Fe-Mg (Iron-Magnesium); Binary Alloy Phase Diagrams, 1985 pp. 1076-1077, Nayeb-Hashemi, et al.
Fe-Mo (Iron-Molybdenum); Binary Alloy Phase Diagrams, 1982 p. 1079, Guillermet.
General Alloying Theory, Section II-1, Rare Earth Alloys, 1961, 69-80, 132-135 and 199-212, Gschneidner, Jr.

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