Rare earth-transition metal scrap treatment method

Details Rare earth-transition metal scrap treatment method Rare earth-transition metal scrap treatment method

1990-10-01

1992-02-11

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Producing or treating free metal

75610, C22B 5900

Patent

active

050872915

ABSTRACT:
Rare earth-transition metal (e.g. iron) scrap (e.g. Nd-Fe-B scrap) is melted to reduce the levels of tramp oxygen and nitrogen impurities therein. The tramp impurities are reduced in the melt by virtue of the reaction of the tramp impurities and the rare earth to form dross on the melt. The purified melt is separated from the dross for reuse. The oxygen and nitrogen of the melt are reduced to levels acceptable for reuse of the treated alloy in the manufacture of end-use articles, such as permanent magnets.

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.

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