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http://dx.doi.org/10.6111/JKCGCT.2018.28.5.211

A study on the synthesis of lanthanum oxide (La2O3) from NaLa(SO4)2·H2O by metathesis reaction  

Kim, Dae-Weon (Materials Science and Chemical Engineering Center, Institute for Advanced Engineering (IAE))
Ahn, Nak-Kyoon (Materials Science and Chemical Engineering Center, Institute for Advanced Engineering (IAE))
Shim, Hyun-Woo (Materials Science and Chemical Engineering Center, Institute for Advanced Engineering (IAE))
Lee, Chan-Gi (Materials Science and Chemical Engineering Center, Institute for Advanced Engineering (IAE))
Choi, Hee-Lack (Department of Materials Science and Engineering, Pukyong National University)
Hong, Hyun Seon (Sungshin Women's University, Dept. of Environment & Energy Engineering)
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.28, no.5, 2018 , pp. 211-216 More about this Journal
Abstract
The recovery of rare earth elements (REE) including La, Nd and Ce from spent batteries is important issues to reuse scarce resources. Herein, we present a simple recovery process to obtain lanthanum oxide ($La_2O_3$) from spent Ni-MH batteries, and demonstrate the conversion mechanism from $NaLa(SO_4)_2{\cdot}H_2O$ to $La_2O_3$. This strategy requires the initial preparation of $NaLa(SO_4)_2{\cdot}H_2O$ and subsequent metathesis reaction with $Na_2CO_3$ at $70^{\circ}C$. This metathesis reaction resulted in the crystalline lanthanum carbonate hydrate ($La_2(CO_3)_3{\cdot}xH_2O$) powder with plate-like morphology. On the basis of TGA result, the $La_2(CO_3)_3{\cdot}xH_2O$ powder was calcined in air at three different temperatures, that is, $300^{\circ}C$, $500^{\circ}C$, and $1000^{\circ}C$. As the calcination temperature increased, the morphology of powder was changed; prism-like ($NaLa(SO_4)_2{\cdot}H_2O$) ${\rightarrow}$ platelike ($La_2(CO_3)_3{\cdot}xH_2O$) ${\rightarrow}$ aggregated irregular shape ($La_2O_3$). Futhermore, XRD results indicated that the crystalline $La_2O_3$ could be synthesized after the metathesis reaction with $Na_2CO_3$, followed by heat-treatment at $1000^{\circ}C$, along with a change of crystallographic structures; $NaLa(SO_4)_2{\cdot}H_2O$ ${\rightarrow}$ $La_2(CO_3)_3{\cdot}xH_2O$ ${\rightarrow}$ $La_2O_3$.
Keywords
Lanthanum; Rare earth; Carbonate; Metathesis reaction; Lanthanum oxide; Conversion mechanism;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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