Patent ID: 7204891

Claim:
A process of preparing a sintered rare earth magnet comprising the steps of: charging a melting furnace crucible with a rare earth-free magnet-constituent metal feed; heating the metal feed for melting into a melt; adding to the melt a rare earth containing metal feed and 0.1 to 50% by weight based on the metal feeds of an R—Fe—B base rare earth magnet scrap and/or sludge wherein R is a rare earth element inclusive of yttrium; further adding 0.01 to 30% by weight based on the metal feeds of a particulate flux containing a halide of at least one metal selected from among alkali metals, alkaline earth metals and rare earth metals and having an average particle size of 1 to 50 μm; melting the resulting mixture; and crushing, comminuting, compacting in a magnetic field, and sintering the resulting alloy.