Currently, large amounts of scarp form NdFeB magnet manufacture are stockpiled owing to the lack of a cost-effective processing method. Because of the growing new market for individual rare-earth metals such as Nd and owing to the likely continuing increase in demand for permanent magnets, scrap treatment will undoubtedly become an important alternative materials source. Development of a viable method to process NdFeB scarp will aid manufacturers economically and reduce the necessity of consuming rare-earth materials. In the present study, Nd was recovered from NdFeB scrap. To dissolution Nd and Fe, scrap was oxidizing-roasted and leached in sulfuric acid solution. Nd and Fe was separated using double-salt precipitation method by the addition of sodium sulfate to leach liquor. Optimized temperature of oxidizing-roasting was 500? for sintering magnet and 700? for bonded magnet. When oxidizing-roasted NdFeB magnet was treated in 2M sulfuric acid at 50? for 2hr with the pulp density of 15%, 99.4% of Nd and 95.7% of Fe was leached and recovered.

Leaching of NdFeB magnet scrap

243rd National Meeting (2012)

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