Structural and magnetic characterization of Nd-Pr-Fe-B sintered magnet machining wastes

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dc.creatorKaren Bolis
dc.creatorGabriela Silva Goulart
dc.creatorAlisson Carlos Krohling
dc.creatorRenato de Mendonça
dc.creatorLuis Eugenio Fernandez Outon
dc.creatorJose Domingos Ardisson
dc.date.accessioned2025-02-26T11:58:54Z
dc.date.accessioned2025-09-09T00:18:43Z
dc.date.available2025-02-26T11:58:54Z
dc.date.issued2023
dc.description.sponsorshipCNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico
dc.description.sponsorshipFAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais
dc.description.sponsorshipCAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
dc.format.mimetypepdf
dc.identifier.doihttps://doi.org/10.1021/acsomega.2c08249
dc.identifier.issn2470-1343
dc.identifier.urihttps://hdl.handle.net/1843/80447
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofACS Omega
dc.rightsAcesso Aberto
dc.subjectCarbono
dc.subjectPropriedades magnéticas
dc.subjectOxigênio
dc.subjectPartículas
dc.subject.otherCarbon
dc.subject.otherMagnetic properties
dc.subject.otherOxygen
dc.subject.otherParticle size
dc.subject.otherWastes
dc.titleStructural and magnetic characterization of Nd-Pr-Fe-B sintered magnet machining wastes
dc.typeArtigo de periódico
local.citation.epage12258
local.citation.issue13
local.citation.spage12246
local.citation.volume8
local.description.resumoNd–Pr–Fe–B sintered magnets are considered important for emerging technologies. They are fundamental to the energy matrix transition, such as electric and hybrid vehicles and wind turbines. The production of these magnets generates tons of residues in the machining process step. Since China dominates the rare-earth (RE) market, leading to supply shortages, processing wastes are a promising alternative for recycling or reusing RE materials. Due to the amount generated and the chemical composition, containing up to 30 wt % of critical rare-earth elements, the studies of RE magnets are expanding in the current circular economy scenario. In this work, Nd–Pr–Fe–B machining wastes from two different machining processes (diamond cutting and grinding) were characterized by X-ray diffraction, Mössbauer spectroscopy, vibrating sample magnetometer with first-order-reversal-curves, scanning electron microscopy, X-ray fluorescence, elemental analysis, and X-ray photoelectron spectroscopy. The results showed that the degradation of the phases in both wastes is relatively strong. The phases of the magnets are decomposed into oxides, hydroxides, and hydrated oxides such as Nd(OH)3, ferrihydrite, and metallic iron. In addition, the machining process provokes a change in the iron vicinity of the Nd2Fe14B phase. The presence of impurities and the wide dispersion of particle sizes resulted in low magnetic properties and affected the magnetization behavior of the machining waste. Using different characterization techniques, it was found that the oxides formed during the machining processes are located on the surfaces of the particles, while the center consists of a nondegraded Nd2Fe14B phase. It was also found that the Nd–Pr–Fe–B wastes have similarities, indicating that it is possible to mix wastes from different machining processes before recycling. The complete characterization of the Nd–Pr–Fe–B machining residues indicated that different reuse and recycling strategies can be evaluated to improve the efficiency of reusing these machining wastes as secondary sources.
local.identifier.orcidhttps://orcid.org/0000-0002-9177-5105
local.identifier.orcidhttps://orcid.org/0000-0002-8659-4166
local.identifier.orcidhttps://orcid.org/0000-0003-3264-337X
local.publisher.countryBrasil
local.publisher.departmentICX - DEPARTAMENTO DE FÍSICA
local.publisher.initialsUFMG
local.url.externahttps://pubs.acs.org/doi/10.1021/acsomega.2c08249

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