Method for treating rare earth-transition metal scrap

Details Method for treating rare earth-transition metal scrap Method for treating rare earth-transition metal scrap

1990-10-01

1992-12-29

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Producing or treating free metal

75610, C22B 5900

Patent

active

051748118

ABSTRACT:
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.

REFERENCES:
patent: 2950962 (1960-08-01), Carlson et al.
patent: 3150964 (1964-09-01), Carlson et al.
patent: 4308474 (1981-12-01), Savage et al.
patent: 4578242 (1986-03-01), Sharma
patent: 4612047 (1986-09-01), Schmidt et al.
patent: 4636353 (1987-01-01), Seon et al.
Beaudry & Gschneidner, Jr., Preparation And Basic Properties Of The Rare Earth Metals, 1978.

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