Selective and efficient extraction of Nd from NdFeB magnets via ionization in LiCl-KCl-CdCl2 melt
| Autor: | Jungho Hur, Jaeyeong Park, Gwan Yoon Jeong, Sungjune Sohn, Younghwan Jeon |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Scanning electron microscope Mechanical Engineering Extraction (chemistry) Metals and Alloys Analytical chemistry 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Neodymium magnet Mechanics of Materials Magnet Ionization Materials Chemistry Cyclic voltammetry Molten salt 0210 nano-technology Spectroscopy |
| Zdroj: | Journal of Alloys and Compounds. 860:158424 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2020.158424 |
| Popis: | The growing popularity of NdFeB magnets has created a demand for sustainable Nd recycling processes with fewer byproducts and higher extraction efficiencies. To address this need, we herein studied the extraction of Nd from NdFeB magnets via selective ionization in CdCl2-LiCl-KCl at 773 K. When the CdCl2 content was sufficiently large to completely ionize Nd into Nd3+,> 99% of Nd was selectively extracted into the salts within 2 h, while Fe and B remained in the solid phase. The microstructural and compositional changes of the magnet and salts were examined by scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy and by inductively coupled plasma-optical emission spectrometry. In the presence of CdCl2, the magnet was naturally fragmented and pulverized. Correlations between CdCl2 content and cyclic voltammetry data (peak current density and peak potential) were established and validated to monitor the reaction progress on-line, and the maximum correlation errors for peak current density and peak potential were found to be less than 8.33% and 16.1%, respectively. Finally, the results of this study were combined with those of previous works to propose a novel Nd recycling process based on molten salt usage. |
| Databáze: | OpenAIRE |
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