Extraction behavior of bifunctional ionic liquid [N₁₈₈₈][SOPAA] and TBP for rare earth elements

陈金清¹，黄超^1,2，王艳良^2,3，黄彬^1,2，孙晓琦^2,3

1. School of Metallurgy and Chemical Engineering, Jiangxi University of Science & Technology3. Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences

摘 要：Extraction and separation of yttrium in chloride medium using tri-n-octylmethylammonium（2-sec-octylphenoxy） acetate([N₁₈₈₈][SOPAA]) as an extractant were studied in this article. Tri-n-butyl phosphate（TBP） was used as a phase modifier to accelerate phase separation and improve the stability of organic phase. The addition of TBP contributed to shortening phase separation time, increasing extraction capacity of rare earth elements（REEs） and decreasing viscosity of organic phase. The slope analysis method and infrared spectroscopy were conducted to investigate the ion-association extraction mechanisms. Extraction and stripping performances of the different systems were also compared. The article showed that the extraction performance of mixed [N₁₈₈₈][SOPAA] and TBP is superior to that of [N₁₈₈₈][SOPAA] for heavy rare earth element（HREE）.

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