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Limited studies have reported the effect of mixing the tri-n-octylamineTri-n-octylamine (TOA) with organophosphorous extractants other than Cyanex 272 for the extraction of rare earth elementsRare 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 reaction between TOA and D2EHPA, PC88A, and Cyanex 272 followed aggregation formation with different number of aggregates for each.

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Investigation on the Interaction Between Acidic Organophosphorous Extractants and Tri-N-Octylamine (TOA) for the Extraction of Rare Earths in HCl System

  • 会议论文

  • 发表日期：

    2025年

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  • Arsyad Maulana Dzulqornain,
  • Jae-Chun Lee,
  • Hosung Yoon,
  • Rina Kim,
  • Kyeong-Woo Chung

摘要

Limited studies have reported the effect of mixing the tri-n-octylamineTri-n-octylamine (TOA) with organophosphorous extractants other than Cyanex 272 for the extraction of rare earth elementsRare 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 reaction between TOA and D2EHPA, PC88A, and Cyanex 272 followed aggregation formation with different number of aggregates for each.