| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
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| Symposium
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REWAS 2025: Sustainable End-of-Life Management and Recycling Solutions for Batteries, Wind Turbines, and Photovoltaics
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| Presentation Title |
Sustainable route for Nd recycling from end-of-life NdFeB magnet using a deep eutectic solvent |
| Author(s) |
Jai Shree, Biplob Pramanik, Shuronjit Kumar Sarker, Warren Bruckard, Veeriah Jegatheesan, Nawshad Haque |
| On-Site Speaker (Planned) |
Jai Shree |
| Abstract Scope |
This study investigates deep eutectic solvents (DESs) as eco-friendly alternatives to inorganic acids for selectively leaching rare earth elements (REEs) from waste NdFeB magnets. Different combinations of malonic acid and choline chloride as DESs were evaluated, showing effectiveness for light REE leaching. Experiments using real end-of-life NdFeB magnet from notes printing machines are used for leaching optimization. Three pre-treatment methods were applied to improve leaching efficiency: oxidative roasting, NaOH digestion, and a combination of both. Introducing NaOH digestion produced Nd(OH)3 and Fe2O3, which were then converted to Nd2O3 and Fe3O4 via oxidative roasting. The NaOH-digested product enabled selective REE leaching with different ratios of malonic acids and choline chloride DES. 1:1 (malonic acids and choline chloride) DES exhibited the highest leaching, with >95% leaching of Nd and the solvent remained reusable with high efficiency. This method offers an environmentally friendly approach with high REE recovery and solvent reusability. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Recycling and Secondary Recovery, Extraction and Processing, Hydrometallurgy |