Abstract
Grinding sludge from the sintered neodymium-iron -boron (NdFeB) magnets production process was enriched with critical rare earth elements (neodymium, dysprosium and praseodymium), which can be up to 30% in the magnets . The demand of NdFeB magnets are simultaneously growing. Therefore, rare earths recovered from waste residue would reduce the demand of rare earth elements from primary sources. In this study, the feasibility of recycling rare earths through a hydrometallurgical process was investigated. The selective leaching of Nd from grinding sludge can successfully raise the rare earths concentration to 70%. The necessity of an oxidation pretreatment to improve the selectivity between Nd and Fe will be described.
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Acknowledgements
The authors would like to thank the Department of Primary Industries and Mines, Ministry of Industry of Thailand for financial support under grant number 23/2560. Suranaree University of Technology, The Center of Scientific and Technological Equipment, and Synchrotron Light Research Institute of Thailand are acknowledged for providing the instrumental analysis.
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© 2018 The Minerals, Metals & Materials Society
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Piyawit, W. et al. (2018). Selective Extraction and Recovery of Rare Earth Metals (REMs) from NdFeB Magnet Grinding Sludge. In: Davis, B., et al. Extraction 2018. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-95022-8_202
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DOI: https://doi.org/10.1007/978-3-319-95022-8_202
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