Hydrogen grinding treatment method and a method of manufacturing a rare earth magnetic material powd

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PROBLEM TO BE SOLVED : To prevent the oxidation of a material while safely and efficiently performing a hydrogenation granulating treatment stage for a rare-earth magnetic material and a subsequent cooling stage, and to improve magnetic properties. SOLUTION : In a hydrogenation granulating apparatus 10 for performing hydrogenation granulating treatment of the rare-earth magnetic material, an outlet chamber 12 is provided in front of an outlet hole 16 of a furnace body 14, and inert gas is fed into the chamber 12. When the rare-earth magnetic material after hydrogenation milling is taken out and moved to a conveyance device 26, the magnetic material is prevented from coming into contact with the air. Conveyance after the hydrogenation milling and cooling are performed also in an inert gas, so that the raw material in high-temperature state can be prevented from being brought into contact with the air and from resultantly being oxidized.