Procedure for cutting up magnetic material on rare ground connection basis with hydrogen, and conta

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A case (10) for hydrogen-pulverizing a rare earth metal-based magnetic material is disclosed. The case (10) includes a case body (11) which is formed of a material having a heat conductivity of 1 W/cm.deg or more. At least one heat-transferring/releasing member (14) is mounted in the case body (11) and formed of a material having a heat conductivity of 1 W/cm.deg or more. The magnetic material is accommodated in the case (10) and subjected to a hydrogen pulverization with hydrogen occluded in the magnetic material. Thus, the heating and cooling of the magnetic material can be performed in a short time, thereby achieving the pulverization of the magnetic material with an extremely excellent productivity.