TITLE

Selective Leaching Process for Neodymium Recovery from Scrap Nd-Fe-B Magnet

AUTHOR(S)
Lee, Ching-Hwa; Chen, Yu-Jung; Liao, Ching-Hua; Popuri, Srinivasa R.; Tsai, Shang-Lin; Hung, Chi-En
PUB. DATE
December 2013
SOURCE
Metallurgical & Materials Transactions. Part A;Dec2013, Vol. 44 Issue 12, p5825
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Neodymium-iron-boron (Nd-Fe-B) magnets were most widely applied to permanent magnetic products in the world due to their high magnetic force. The increasing growth of scrap Nd-Fe-B magnets resulted in disposal problems and the reduction of neodymium (Nd) valuable resources. In this study, we developed a simple hydrometallurgical precipitation process with pH adjustment to separate and recover Nd 100 pct recovery from scrap Nd-Fe-B magnets. Several physical and chemical methods such as demagnetization, grinding, screening, and leaching processes were also adopted to investigate the recovery of Nd and other metals from scrap Nd-Fe-B magnets. The leaching process was carried out with four leaching reagents such as NaOH, HCl, HNO 3, and H 2SO 4. Batch studies were also conducted to optimize the leaching operating conditions with respect to leaching time, concentration of leaching reagent, temperature, and solid/liquid ratio for both HCl and H 2SO 4 leaching reagents. Nd was successfully separated and recovered with 75.41 wt pct from optimized H 2SO 4 leaching solution through precipitation. Further, the purity and weight percentage of the obtained Nd product was analyzed using scanning electron microscopy–energy-dispersive spectroscopy (SEM-EDS) analysis. An X-ray diffraction (XRD) study confirmed the obtained product of Nd was in the form of NdOOH and Nd(OH) 3.
ACCESSION #
91988706

 

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