MAGNETIC POWDER RECOVERING METHOD OF RARE-EARTH BONDED MAGNET AND MAGNET MATERIAL FOR RARE-EARTH BON

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PROBLEM TO BE SOLVED : To provide a magnetic powder recovering method of a rare-earth bonded magnet which can finely extract magnetic powders from magnet scraps by a cheap method while maintaining original magnetism. SOLUTION : The magnetic powders are recovered through (a) a grinding step of grinding the rare-earth bonded magnet, (b) a heat decomposition step which heats a ground product to a heat decomposition start temperature of a resin binder or higher under a nonoxidizing atmosphere inside an airtight container to heat-decompose the resin binder and then removes the resin binder from the magnetic powders, (c) a cooling step of cooling the inside of the container, (d) a deoxidization step of supplying the container with oxygen after the cooling step to hold the inside of the container in a low oxygen state, and (e) a magnetic powder extraction step of bleeding the container to the atmosphere after the deoxidization step to extract the internal magnetic powders outside of the container. COPYRIGHT : (C)2011, JPO&INPIT