An acid-free process for selective REE recovery from spent NdFeB magnets by room-temperature electrolysis

Zhihan, Zhang; Zhi, Wang; Dong, Wang; Rui, Min; Wanhai, Xiao; Yong, Lin; Guobiao, Li

doi:10.1039/d3gc03031h

Green Chem.

2023

DOI: 10.1039/d3gc03031h

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An acid-free process for selective REE recovery from spent NdFeB magnets by room-temperature electrolysis

Zhang Zhihan,

Wang Zhi,

Wang Dong

et al.

Abstract: An acid-free electrochemical process has been developed for the selective recovery of REEs from EOL NdFeB magnets at room temperature. Fe2+ produced by NdFeB was oxidized at and hydrolyzed to Fe(OH)3in situ to separate from REEs. Subsequently, the recycling of ZnCl2 electrolyte was realized.

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Cited by 3 publications

References 41 publications

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Selective neodymium oxide recovery from permanent magnet scraps using waste pickling solutions

Jin,

Eom,

Kim

et al. 2024

Journal of Alloys and Compounds

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Selective neodymium oxide recovery from permanent magnet scraps using waste pickling solutions

Jin,

Eom,

Kim

et al. 2024

Journal of Alloys and Compounds

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Selective leaching and recovery of rare earth from NdFeB waste through a superior selective and stable deep eutectic solvent

Shuping,

Zhihan,

Dong

et al. 2025

Separation and Purification Technology

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Preparation of (Nd, Ce)-Fe-B Regenerated Magnets by In-Situ Restoration of Grain Boundary Structure Using Nascent Nd-Fe-B Powder

Yu,

Luo,

Yang

et al. 2024

Materials

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Rare earth resource recycling is an important endeavor for environmental protection and resource utilization. This study explores the method of preparing regenerated magnets using waste magnets as raw materials based on existing processes. By utilizing existing Nd-Fe-B production equipment, various waste magnets are transformed into recycled powder. Next, nascent Nd-Fe-B powders with slightly higher rare earth content are selected as the repairing agent. The regenerated magnets are prepared by incorporating the nascent powder into the recycled powder. The focus lies in investigating the repairing effect of the nascent powder repairing agent on the microstructure of regenerated magnets and exploring the influence of sintering temperature and powder addition on the magnetic properties and microstructure of the regenerated magnets. The results showed that the nascent powder increased the proportion of grain boundary phases and effectively repaired the grain boundary structure of the regenerated magnets. In addition, the Pr element in the nascent powder replaces the Ce element in the recycled powder, which ultimately improves the magnetic properties of the regenerated magnet in a comprehensive manner. This study provides valuable insights and guidance for rare earth resource recycling and the preparation of regenerated magnets.

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An acid-free process for selective REE recovery from spent NdFeB magnets by room-temperature electrolysis

Cited by 3 publications

References 41 publications

Selective neodymium oxide recovery from permanent magnet scraps using waste pickling solutions

Selective neodymium oxide recovery from permanent magnet scraps using waste pickling solutions

Selective leaching and recovery of rare earth from NdFeB waste through a superior selective and stable deep eutectic solvent

Preparation of (Nd, Ce)-Fe-B Regenerated Magnets by In-Situ Restoration of Grain Boundary Structure Using Nascent Nd-Fe-B Powder

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