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Leaching kinetics of neodymium in sulfuric acid from E-scrap of NdFeB permanent magnet

Authors
Yoon, Ho-SungKim, Chul-JooChung, Kyeong WooLee, Su-JeongJoe, A-RamShin, Yang-HoLee, Se-IlYoo, Seung-JoonKim, Jin-Geol
Issue Date
Apr-2014
Publisher
한국화학공학회
Keywords
NdFeB Permanent Magnet; Leaching; E-scrap; Neodymium Sulfate; Ash Layer Diffusion
Citation
Korean Journal of Chemical Engineering, v.31, no.4, pp 706 - 711
Pages
6
Journal Title
Korean Journal of Chemical Engineering
Volume
31
Number
4
Start Page
706
End Page
711
URI
https://scholarworks.bwise.kr/sch/handle/2021.sw.sch/12295
DOI
10.1007/s11814-013-0259-5
ISSN
0256-1115
1975-7220
Abstract
The leaching kinetics of neodymium in NdFeB permanent magnet powder was analyzed for the purpose of recovery of neodymium in sulfuric acid (H2SO4) from E-scrap (electric scrap) of NdFeB permanent magnet powder treated by oxidation roasting to form a reactant. The reaction was conducted with H2SO4 concentrations ranging from 2.5 to 3.5M, a pulp density of 110.8 g/L, an agitation speed of 750 rpm, and a temperature range of 30 to 70 A degrees C. After 4 h of leaching, the neodymium content in the E-scrap powders was completely converted into a neodymium sulfate (Nd-2(SO4)(3)) solution phase in H2SO4 in the condition of 70 A degrees C and 3.0M H2SO4. Based on a shrinking core model with sphere shape, the leaching mechanism of neodymium was determined by the rate-determining step of the ash layer diffusion. Generally, the solubility of pure rare earth elements in H2SO4 is decreased with an increase in leaching temperatures. However, the leaching rate of the neodymium in E-scrap powders increased with the leaching temperatures in this study because the ash layer included in the E-scrap powder provided resistance against the leaching. Using the Arrhenius expression, the apparent activation energy values were determined to be 2.26 kJmol(-1) in 2.5M H2SO4 and 2.77 kJmol(-1) in 3.0 M H2SO4.
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