Electrochemical behavior of Nd in its pyrometallurgical recovery from waste magnet  

作　　者：Hong-Youl Ryu Jong-Hyeon Lee Wan-Gou Kim Hayk H.Nersisyan Go-Gi Lee Sung-Koo Jo Huk-Hee Lee Il-Soon Hwang 

机构地区：[1]Graduate School of Green Energy Technology, Chungnam National University [2]Department of Nano Materials Engineering, Chungnam National University [3]Rapidly Solidified Materials Research Institute, Chungnam National University [4]Research Institute of Industrial Science and Technology [5]Korea Research Institute of Chemical Technology [6]School of Energy Systems Engineering, Seoul National University

出　　处：《Rare Metals》2015年第2期111-117,共7页稀有金属（英文版）

基　　金：financially supported by the Korea Institute of Energy Technology Evaluation and Planning(KETEP) of the Korea Government Ministry of Knowledge Economy (No. 20122010300041);the National Research Foundation of Korea (No. 2011-0091839)

摘　　要：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 %.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 %.

关 键 词：ELECTROWINNING NEODYMIUM Nd-Fe-Bmagnet Rare earth recycling 

分 类 号：TF845[冶金工程—有色金属冶金]