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Novel Reactive Anode for Electrochemical Extraction of Rare Earth Metals from Rare Earth Oxides
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
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2017 (Engelska)Ingår i: RARE METAL TECHNOLOGY 2017 / [ed] Kim, H Alam, S Neelameggham, NR Oosterhof, H Ouchi, T Guan, X, SPRINGER INTERNATIONAL PUBLISHING AG , 2017, s. 87-92Konferensbidrag (Refereegranskat)
Abstract [en]

Electrolytic production of metallic neodymium is carried out in fused fluoride salts containing neodymium oxide. Two major challenges pertaining to neodymium production are (a) low oxide solubility, (b) possibility of anodic fluorine gas evolution if the electrolysis rate exceeds feeding rate of neodymium oxide. In this study, a novel method is proposed in which iron fluoride (FeF3) is used as a fluorinating agent to convert neodymium oxide into neodymium fluoride. Electron Probe Micro Analysis (EPMA) results of as-converted salt show a complete conversion of neodymium oxide into neodymium fluoride. In the electrolysis process, iron is used as a reactive anode with electrochemical dissolution of iron into the melt, thus preventing fluorine gas evolution at the anode. Therefore, the fluorinating agent is constantly regenerated in situ which enables the continuous conversion of neodymium oxide feed. The cathodic product is a Nd-Fe alloy which can be directly used as a master alloy for the production of NdFeB permanent magnets.

Ort, förlag, år, upplaga, sidor
SPRINGER INTERNATIONAL PUBLISHING AG , 2017. s. 87-92
Nyckelord [en]
Rare earth, Electrochemical extraction, Reactive anode
Nationell ämneskategori
Materialteknik
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URN: urn:nbn:se:kth:diva-211426DOI: 10.1007/978-3-319-51085-9_9ISI: 000405305300009Scopus ID: 2-s2.0-85042256959OAI: oai:DiVA.org:kth-211426DiVA, id: diva2:1129113
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QC 20170801

Tillgänglig från: 2017-08-01 Skapad: 2017-08-01 Senast uppdaterad: 2017-08-01Bibliografiskt granskad

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