About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
2026 Technical Division Student Poster Contest
|
| Presentation Title |
SPG-1: Biphasic Deep Eutectic Solvent System for Selective REE Recovery From Magnetic Waste |
| Author(s) |
Abhijith Rangavajjula, Craig J Neal, Chinmayee Subban, Ajay Karakoti, Sudipta Seal |
| On-Site Speaker (Planned) |
Abhijith Rangavajjula |
| Abstract Scope |
Rare-earth elements (REEs) are critical for energy, electronics, and defense technologies, necessitating their effective recovery and recycling. However, a valuable source of REEs, samarium-cobalt magnets, is rarely recycled due to low recovery efficiencies. In this study, we introduce a green deep eutectic solvent (DES) platform that eliminates use of mineral acids and reduces generation of secondary waste compared to conventional methods. A two-phase DES system was developed using hydrophilic choline chloride-based DES to dissolve feedstock at moderate temperatures, and hydrophobic oleic acid:trioctylphosphine oxide DES for preferential Sm separation over co-dissolved species, by polarity contrast and phosphoryl-Sm3+ complexation. Electrochemical and precipitation methods were compared for the recovery of Sm from DES. Individual DESs were characterized with respect to viscosity, ionic conductivity, contact angle, thermal stability, and hydrogen-bonding. Extraction efficiencies and metal dissolution processes/characters were studied via UV-Vis spectrophotometry and mass spectrometry. Collectively, these results demonstrate a sustainable high-performance REE recovery route. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
Recycling and Secondary Recovery, Sustainability, Other |