One-step recovery of REE oxalates in electro-leaching of spent NdFeB magnets - Publication - Bridge of Knowledge

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One-step recovery of REE oxalates in electro-leaching of spent NdFeB magnets

Abstract

Recovery of rare-earth elements (REEs) from spent NdFeB magnets is receiving great attention because of high amount of neodymium and potential risk of environmental pollution. In this study, a novel environment-friendly hydrometallurgical route is proposed for efficient recovery of REEs during electrochemical leaching with sulfuric and oxalic acids. With proper adjustment of the electrolyte composition and operating conditions, effective separation of different elements is observed; a compact layer of REE oxalates in a purity of up to 93% is obtained on the cathode, while iron remains in the solution and as solid residue for further recovery. The mechanisms during the electro-leaching process were subsequently investigated and we propose that cathodic deposition of the REEs is due to electrostatic attraction of the REE-oxalate particles on the cathode. With this finding, selective recovery of REEs from spent magnets can be achieved. This study provides a new insight on electronic waste recycling by implementing principles of electrochemistry.

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Category:
Articles
Type:
artykuły w czasopismach
Published in:
SEPARATION AND PURIFICATION TECHNOLOGY no. 251,
ISSN: 1383-5866
Language:
English
Publication year:
2020
Bibliographic description:
Makarova I., Ryl J., Sun Z., Kurilo I., Górnicka K., Laatikainen M., Repo E.: One-step recovery of REE oxalates in electro-leaching of spent NdFeB magnets// SEPARATION AND PURIFICATION TECHNOLOGY -Vol. 251, (2020), s.117362-
DOI:
Digital Object Identifier (open in new tab) 10.1016/j.seppur.2020.117362
Verified by:
Gdańsk University of Technology

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