Comparison of Different Leaching Media and Their Effect on REEs Recovery from Spent Nd-Fe-B Magnets

dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorLiu, Fupeng
dc.contributor.authorPorvali, Antti
dc.contributor.authorHalli, Petteri
dc.contributor.authorWilson, Benjamin P.
dc.contributor.authorLundstrom, Mari
dc.contributor.departmentDepartment of Chemical and Metallurgical Engineering
dc.contributor.departmentHydrometallurgy and Corrosion
dc.date.accessioned2020-09-11T06:31:15Z
dc.date.available2020-09-11T06:31:15Z
dc.date.issued2020-02-01
dc.description.abstractRecycling rare-earth elements (REEs) from Nd-Fe-B magnet waste is an important step towards building a sustainable REE supply chain. In this study, two different processes were systematically investigated and compared. In the leaching stage, the effect of increasing H2SO4 or HCl concentrations were studied and it was determined that, although both can successfully promote REEs, B, Fe and Co leaching, HCl solutions extracted a wider range of metals. After leaching, the oxalate and double-sulfate precipitation methods were utilized to separate REEs from either HCl or H2SO4 leachates. Results suggest that, although > 99% REEs precipitation rates could be achieved with oxalate, the purity of REE-containing products is significantly affected by impurities like Fe and Co. In contrast, REE double-sulfate precipitation resulted in a product purity of > 99%; however, high levels of Na2SO4 (8 times the stoichiometric amount) were needed to achieve > 98% of REE precipitation.en
dc.description.versionPeer revieweden
dc.format.extent10
dc.format.extent806-815
dc.format.mimetypeapplication/pdf
dc.identifier.citationLiu , F , Porvali , A , Halli , P , Wilson , B P & Lundstrom , M 2020 , ' Comparison of Different Leaching Media and Their Effect on REEs Recovery from Spent Nd-Fe-B Magnets ' , JOM , vol. 72 , no. 2 , pp. 806-815 . https://doi.org/10.1007/s11837-019-03844-7en
dc.identifier.doi10.1007/s11837-019-03844-7
dc.identifier.issn1047-4838
dc.identifier.issn1543-1851
dc.identifier.otherPURE UUID: 9dd03b52-d4ea-4acc-a857-061b7ebdd673
dc.identifier.otherPURE ITEMURL: https://research.aalto.fi/en/publications/9dd03b52-d4ea-4acc-a857-061b7ebdd673
dc.identifier.otherPURE FILEURL: https://research.aalto.fi/files/51152721/Liu2020_Article_ComparisonOfDifferentLeachingM.pdf
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/46445
dc.identifier.urnURN:NBN:fi:aalto-202009115368
dc.language.isoenen
dc.publisherSPRINGER
dc.relation.ispartofseriesJOMen
dc.relation.ispartofseriesVolume 72, issue 2en
dc.rightsopenAccessen
dc.subject.keywordHIGH-TEMPERATURE OXIDATION
dc.subject.keywordCOBALT OXIDES
dc.subject.keywordACID
dc.subject.keywordDISSOLUTION
dc.subject.keywordMECHANISMS
dc.subject.keywordREDUCTION
dc.subject.keywordKINETICS
dc.subject.keywordSCRAP
dc.subject.keywordIRON
dc.titleComparison of Different Leaching Media and Their Effect on REEs Recovery from Spent Nd-Fe-B Magnetsen
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi
dc.type.versionpublishedVersion
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