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

Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials

Reexamination Certificate

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C148S101000, C419S012000

Reexamination Certificate

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11214768

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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ASM Handbook, vol. 7, Powder Metal Technologies and Applications, p. 1019, 1998.
Derwent Publication Ltd., London, GB: AN 2001-071770 XP002221381, Oct. 11, 2000 *abstract*.

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