Electrochemical behavior of Nd in its pyrometallurgical recovery from waste magnet
High-purity Nd metal was recovered from waste Nd–Fe–B magnet by the molten salt electrowinning process with chemical pretreatment. X-ray diffraction(XRD), scanning electron microscopy(SEM), energy dispersive spectroscopy(EDS), cyclic voltammetry(CV),chronopotentiometry(CP), and inductively coupled p...
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Veröffentlicht in: | Rare metals 2015-02, Vol.34 (2), p.111-117 |
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Hauptverfasser: | , , , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | High-purity Nd metal was recovered from waste Nd–Fe–B magnet by the molten salt electrowinning process with chemical pretreatment. X-ray diffraction(XRD), scanning electron microscopy(SEM), energy dispersive spectroscopy(EDS), cyclic voltammetry(CV),chronopotentiometry(CP), and inductively coupled plasma-atomic emission spectrometer(ICP/AES) were used to characterize the deposit and electrochemical behaviors. The results show that NdF_3 is effectively synthesized from the Nd–Fe–B magnet using HCl solution and NH4F. During the chemical treatment of the waste magnet,iron impurity is eliminated as a soluble [NH4]3[FeF6]complex. Electrowinning using NdF_3 in LiF molten salt shows that Nd metal is deposited from the electrolyte onthe cathode at the reduction potentials ranging from-1.48to-1.35 V(vs. W) with the concentration change of NdF_3.The final purity of Nd metal deposit is higher than99.78 %. |
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ISSN: | 1001-0521 1867-7185 |
DOI: | 10.1007/s12598-014-0241-3 |