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

        윤호성,유승준,Chul-Joo Kim,Kyeong Woo Chung,Su-Jeong Lee,A-Ram Joe,Yang-Ho Shin,Se-Il Lee,Jin-Geol Kim 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.4

        The leaching kinetics of neodymium in NdFeB permanent magnet powder was analyzed for the purposeof recovery of neodymium in sulfuric acid (H2SO4) from E-scrap (electric scrap) of NdFeB permanent magnet powdertreated by oxidation roasting to form a reactant. The reaction was conducted with H2SO4 concentrations ranging from2.5 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 oC. After4 h of leaching, the neodymium content in the E-scrap powders was completely converted into a neodymium sulfate(Nd2(SO4)3) solution phase in H2SO4 in the condition of 70 oC and 3.0M H2SO4. Based on a shrinking core model withsphere shape, the leaching mechanism of neodymium was determined by the rate-determining step of the ash layerdiffusion. 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 temperaturesin this study because the ash layer included in the E-scrap powder provided resistance against the leaching. Using theArrhenius expression, the apparent activation energy values were determined to be 2.26 kJmol−1 in 2.5M H2SO4 and2.77 kJmol−1 in 3.0 M H2SO4.

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        Leaching kinetics of neodymium in sulfuric acid of rare earth elements (REE) slag concentrated by pyrometallurgy from magnetite ore

        Ho-Sung Yoon,Seung-Joon Yoo,Chul-Joo Kim,Kyung Woo Chung,Jin Young Lee,Shun-Myung Shin,Su-Jeong Lee,A-Ram Joe,Se-Il Lee 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.10

        We studied the leaching kinetics of recovering neodymium in sulfuric acid from the rare earth elements(REE) slag concentrated by smelting reduction from a magnetite ore containing monazite. The leaching kinetics onneodymium was conducted at a reactant concentration of 1.5 g REE slag per L of 0.3 M H2SO4, agitation of 750 rpmand temperature ranging from 30 to 80 oC. Neodymium oxide included in the REE slag was completely converted intoneodymium sulfate phase (Nd2(SO4)3) in H2SO4 after the leaching of 5 h, 80 oC. As a result, the leaching mechanismwas determined in a two-stage model based on the shrinking core model with spherical particles. The first step wasdetermined by chemical reaction, and the second step was determined by ash layer diffusion because the leaching ofREEs by the first chemical reaction increases the formation of the ash layer affecting as a resistance against the leaching. By using the Arrhenius expression, the apparent activation energy of the first chemical reaction step was found to be9kJmol−1. After the first chemical reaction, leaching reaction rate was determined by the ash layer diffusion. The apparentactivation energy of ash layer diffusion was found to be 32 kJmol−1.

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