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Electrochemical behavior of Nd in its pyrometallurgical recovery from waste magnet
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作者 Hong-Youl Ryu Jong-Hyeon Lee +5 位作者 Wan-Gou Kim Hayk H.Nersisyan Go-Gi Lee Sung-Koo Jo Huk-Hee Lee Il-Soon Hwang 《Rare Metals》 SCIE EI CAS CSCD 2015年第2期111-117,共7页
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 spe... 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 %. 展开更多
关键词 ELECTROWINNING NEODYMIUM Nd-Fe-Bmagnet rare earth recycling
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Hydrogen disproportionation phase diagram and magnetic properties for Nd15Fe79B6 alloy
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作者 mateusz szymański bartosz michalski +2 位作者 elzbieta jezierska1 marcin leonowicz zbigniew miazga 《Journal of Rare Earths》 SCIE EI CAS CSCD 2016年第8期843-849,共7页
Transformation-temperature-hydrogen pressure phase diagram was constructed for a Nd15Fe79B6 alloy in order to estimate appropriate conditions for hydrogenation, disproportionation, desorption and recombination reacti... Transformation-temperature-hydrogen pressure phase diagram was constructed for a Nd15Fe79B6 alloy in order to estimate appropriate conditions for hydrogenation, disproportionation, desorption and recombination reaction (the HDDR). Optimised recom- bination time (the highest coercivity) was found to be 10 rain. for 5 g samples processed at 740 ℃. Several HDDR processes were carried out at 30 kPa of hydrogen pressure at various temperatures. No correlation between magnetic propertiec and a direction of measurement was observed for the samples processed at 740 ℃. Remanence anisotropy was induced along an alignment direction when the temperature of the HDDR process was increased up to 800 ℃ and 850℃ for 〈100 gm and 100-160 p.m particles, respec- tively. Simultaneously, a small drop in coercivity was observed in the direction of alignment for 〈100 pm particles, but no for 100-160 grn particles. Furthermore, probably an ordered phase was found by TEM microstructure analysis in the bulk sample dis- proportionated at 850 ℃ under 150 kPa of hydrogen. Grains with antiphase domains were observed and corresponding electron dif- fraction patterns were resolved, likely indicating superlattice structures. 展开更多
关键词 NdlsFe79B6 rare earths recycling hydrogenation disproportionation desorption and recombination (HDDR) ordered phase SUPERLATTICE
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