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

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

Abstrakt

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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Kategoria:
Publikacja w czasopiśmie
Typ:
artykuły w czasopismach
Opublikowano w:
SEPARATION AND PURIFICATION TECHNOLOGY nr 251,
ISSN: 1383-5866
Język:
angielski
Rok wydania:
2020
Opis bibliograficzny:
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:
Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.1016/j.seppur.2020.117362
Weryfikacja:
Politechnika Gdańska

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