Chemical Research in Chinese Universities ›› 2015, Vol. 31 ›› Issue (4): 621-626.doi: 10.1007/s40242-015-4376-z

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Extraction of Lithium from Salt Lake Brine with Triisobutyl Phosphate in Ionic Liquid and Kerosene

GAO Daolin1, YU Xiaoping1, GUO Yafei1, WANG Shiqiang1, LIU Mingming1, DENG Tianlong1, CHEN Yuwei1,2, BELZILE Nelson1,2   

  1. 1. Tianjin Key Laboratory of Marine Resources and Chemistry, College of Chemical Engineering and Material Science, Tianjin University of Science and Technology, Tianjin 300457, P. R. China;
    2. Department of Chemistry & Biochemistry, Laurentian University, Sudbury P3E2C6, Canada
  • Received:2014-10-09 Revised:2015-01-12 Online:2015-08-01 Published:2015-02-02
  • Contact: DENG Tianlong E-mail:tldeng@tust.edu.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China(Nos.21276194, U1407113), the Training Program for Changjiang Scholars and Innovative Research Team in University, China(No.[2013]373) and the Innovative Research Team of Tianjin Municipal Education Commission, China(No.TD12-5004).

Abstract:

Three ionic liquids(ILs), namely, 1-butyl-3-methylimidazolium hexafluorophosphate, 1-butyl-3-me- thylimidazolium bis[(trifluoromethyl)sulfonyl]imide and 1-ethyl-3-methylimidazolium bis[(trifluoromethyl)sul- fonyl]imide with the triisobutyl phosphate(TIBP) and kerosene system were respectively used to extract lithium ion from salt lake brine with a high concentration ratio of magnesium and lithium experimentally. Results indicate that the highest extraction selectivity for lithium was obtained with IL 1-ethyl-3-methylimidazolium bis[(trifluoromethyl)- sulfonyl]imide. The effects of solution pH and phase ratio R(O/A) on the extractive step and the influence of acid concentration of the stripping solution and R(O/A) on the back extraction step were also investigated systematically. The single-step extraction efficiency of lithium ion was 83.71% under the optimal extraction conditions, and the single-step back extraction efficiency was 85.61% with a 1.0 mol/L HCl in 1.0 mol/L NaCl medium as stripping agent at R(O/A)=2. The liquid-liquid extraction mechanism and the complex of the ligand with lithium were proposed.

Key words: Ionic liquid, Triisobutyl phosphate, Extraction, Lithium, Salt lake brine