Remelting of rare earth magnet scrap and/or sludge,...

Details Remelting of rare earth magnet scrap and/or sludge,... Remelting of rare earth magnet scrap and/or sludge,...

2005-11-01

2005-11-01

Sheehan, John P. (Department: 1742)

Specialized metallurgical processes, compositions for use therei

Processes

Producing or treating free metal

C075S581000, C148S100000, C148S101000, C148S302000

Reexamination Certificate

active

06960240

ABSTRACT:
Rare earth magnet scrap and/or sludge is remelted for reuse. Once a rare earth-free magnet-constituent metal feed is loaded in a melting furnace and heated into a melt, a rare earth-containing metal feed and the rare earth magnet scrap and/or sludge are added to the melt, a particulate flux of an alkali metal, alkaline earth metal or rare earth metal halide and having an average particle size of 1-50 μm, preferably wrapped in a metal foil, is added to the melt, and the resulting mixture is melted, from which an alloy ingot is obtained. The valuable elements in the scrap and/or sludge can be recycled. Better separation between the slag and the molten metal ensures that the ingot is obtained from the melt in a high yield.

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Derwent Publication Ltd., London, GB; AN 2001-071770 XP002221381, Oct. 11, 2000 *abstract*.

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