Pheasey, C;
Angeli, P;
(2023)
Intensified Nd extraction in small channels for NdFeB magnet recycling.
Separation and Purification Technology
, 311
, Article 122958. 10.1016/j.seppur.2022.122958.
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Abstract
Neodymium (Nd) was continuously extracted from aqueous solutions by trioctylphosphine oxide (TOPO) dissolved in the ionic liquid 1-Butyl-3-methylimidazolium Bis (trifluoromethanesulfonyl)imide ([C4mim][Tf2N]) in small channel contactors. Kinetic studies confirmed a 1:6 Nd:TOPO extraction mechanism at high initial Nd concentrations of 0.005 and 0.01 M in a 0.001 M nitric acid aqueous phase. The continuous flow extractions were carried out in channels with 0.5 and 1 mm diameter and the effects of mixture velocity and residence time on the extraction efficiency and the mass transfer coefficient were investigated. At equal phase mixture velocities, the flow pattern studies highlighted a plug flow regime at mixture velocities of 0.01 to 0.05 m/s for both channels, resulting in interfacial areas of up to 4900 m2/m3 in the 0.5 mm channel and 2500 m2/m3 in the 1 mm channel. After 37.5 s residence time, extraction efficiencies of 80 % were found in the 0.5 mm channel at a KLα of 0.09 s−1 and 70 % at 0.04 s−1 in the 1 mm channel. The same extraction efficiencies were achieved in 1–2 h in the batch systems.
| Type: | Article |
|---|---|
| Title: | Intensified Nd extraction in small channels for NdFeB magnet recycling |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.seppur.2022.122958 |
| Publisher version: | https://doi.org/10.1016/j.seppur.2022.122958 |
| Language: | English |
| Additional information: | This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third-party material in this article are included in the Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
| Keywords: | Ionic liquids, Liquid-liquid, Rare earths, Mass transfer, Small channels |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10165076 |
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