METHOD FOR RECOVERING RARE-EARTH ELEMENTS FROM WASTE PERMANENT MAGNET OXIDATION SCRAP

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PROBLEM TO BE SOLVED : To provide a method for recovering rare-earth elements with high recovery ratio, from the waste permanent magnet oxidation scrap. SOLUTION : From a waste permanent magnet oxidation scrap, rare-earth elements can be recovered by a method comprising : a step of exuding the waste permanent magnet oxidation scrap with an aqueous sulfuric acid solution; and a step of adding sodium sulfate to the aqueous sulfuric acid solution to precipitate the rare-earth elements contained in the waste permanent magnet oxidation scrap, followed by recovering the same. The waste permanent magnet oxidation scrap may be selected from those containing neodymium. COPYRIGHT : (C)2015, JPO&INPIT