SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2019, Vol. 27 ›› Issue (2): 335-340.DOI: 10.1016/j.cjche.2018.04.010

• Separation Science and Engineering • 上一篇    下一篇

Selective recovery of lithium from simulated brine using different organic synergist

Huifang Li1,2,3,4, Lijuan Li1, Xiaowu Peng1,3, Lianmin Ji1, Wu Li1,2   

  1. 1 Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China;
    2 Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining 810008, China;
    3 University of Chinese Academy of Sciences, Beijing 100049, China;
    4 Qinghai University, Xining 810010, China
  • 收稿日期:2018-01-30 修回日期:2018-03-18 出版日期:2019-02-28 发布日期:2019-03-18
  • 通讯作者: Lijuan Li, Wu Li
  • 基金资助:

    Supported by Natural Science Foundation of China–Qaidam Salt Lake Chemical Joint Scientific Research Funds (U1407203)

Selective recovery of lithium from simulated brine using different organic synergist

Huifang Li1,2,3,4, Lijuan Li1, Xiaowu Peng1,3, Lianmin Ji1, Wu Li1,2   

  1. 1 Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China;
    2 Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining 810008, China;
    3 University of Chinese Academy of Sciences, Beijing 100049, China;
    4 Qinghai University, Xining 810010, China
  • Received:2018-01-30 Revised:2018-03-18 Online:2019-02-28 Published:2019-03-18
  • Contact: Lijuan Li, Wu Li
  • Supported by:

    Supported by Natural Science Foundation of China–Qaidam Salt Lake Chemical Joint Scientific Research Funds (U1407203)

摘要: The organic synergists, including Octanol, ethyl acetate (EA), butyl acetate (BA), methyl isobutyl ketone (MIBK), diisobutyl ketone (DIBK), N,N-bis(2-ethylhexyl) acetamide (N523) and 8-hydroxylquiolate, were added to the TBP-FeCl3 extraction system to extract lithium from brine. The effects of concentration of organic synergist and total organic extractant, molar ratio of Fe/Li, phase ratio, counter-current extraction and the acidity of stripping agent on lithium extraction were investigated to optimize the extraction conditions. Under the optimize conditions, the results of counter-current extraction showed the mixed extraction system was the preponderance on the lithium extraction. Especially the separation of lithium in organic phase and aqueous phase and the separation mass ratio of Mg/Li increased greatly. An extraction mechanism was proposed based on the analysis of FT-IR spectra and Raman spectra.

关键词: Organic synergist, Lithium extraction, Mixed extraction system, Mechanism

Abstract: The organic synergists, including Octanol, ethyl acetate (EA), butyl acetate (BA), methyl isobutyl ketone (MIBK), diisobutyl ketone (DIBK), N,N-bis(2-ethylhexyl) acetamide (N523) and 8-hydroxylquiolate, were added to the TBP-FeCl3 extraction system to extract lithium from brine. The effects of concentration of organic synergist and total organic extractant, molar ratio of Fe/Li, phase ratio, counter-current extraction and the acidity of stripping agent on lithium extraction were investigated to optimize the extraction conditions. Under the optimize conditions, the results of counter-current extraction showed the mixed extraction system was the preponderance on the lithium extraction. Especially the separation of lithium in organic phase and aqueous phase and the separation mass ratio of Mg/Li increased greatly. An extraction mechanism was proposed based on the analysis of FT-IR spectra and Raman spectra.

Key words: Organic synergist, Lithium extraction, Mixed extraction system, Mechanism