| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
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Innovative Hydrometallurgical Technologies for Environmentally Benign Processing and Remediation: An EPD Symposium Honoring Fiona Doyle
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| Presentation Title |
Investigation on the Interaction between Acidic Organophosphorous Extractants and Tri-n-octylamine (TOA) for the Extraction of Rare Earths in HCl System |
| Author(s) |
Arsyad Maulana Dzulqornain, Jae-chun Lee, Hosung Yoon, Rina Kim, Kyeong-woo Chung |
| On-Site Speaker (Planned) |
Arsyad Maulana Dzulqornain |
| Abstract Scope |
Limited studies have reported the effect of mixing the TOA with organophosphorous extractants other than Cyanex 272 for the extraction of rare earth elements (REEs). In this study, the interaction between TOA and acidic organophosphorous extractants, including D2EHPA, PC88A, and Cyanex 272 was quantitatively estimated thermodynamically when they were contacted under hydrochloric acid (HCl) system. D2EHPA showed strongest interaction with TOA, followed by PC88A, then Cyanex 272, indicating that in the D2EHPA-TOA-HCl system, free TOA was less available for the extraction of HCl compared with PC88A and Cyanex 272. The model comprising of acidic extractant-TOA-HCl interaction was applied to predict the outcome of the extraction in the system involving REEs and was verified by experimental results. The resulting organic species of the acidic extractant-TOA-HCl were examined by using FTIR, and it was found that the interaction between acidic organophosphorous extractants and TOA mainly involved hydrogen bonding. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Hydrometallurgy, Extraction and Processing, Other |