화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.113, 254-263, September, 2022
DOI10.1016/j.jiec.2022.05.053  Export Citation
Mechanism and process for the extraction of lithium from the high magnesium brine with N,N-bis(2-ethylhexyl)-2-methoxyacetamide in kerosene and FeCl3
Lianmin Ji1, 2, Licheng Zhang1, 3, Dong Shi1, 3, †, Xiaowu Peng1, 3, Jinfeng Li4, Yuze zhang1, 3, Taoshan Xu1, 3, and Lijuan Li1, 2, †
  • 1Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Engineering Laboratory for Green Applications of Salt Lakes and Salt Deposits, Qinghai Technology Research and Development Center of Comprehensive Utilization of Salt Lakes Resources, Xining, Qinghai 810008, China
  • 2Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing 100190, China
  • 3, China
  • 4Key Laboratory of Organofluorine Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, Shanghai 200032, China
E-mail:,
The degradation of TBP has become a stumbling block to the industrial continuous production of lithium chloride extraction from brines with high Mg/Li ratio by solvent extraction. To develop a more stable and more efficient extraction system, a novel amide system, containing newly synthesized extractant N,N-bis (2-ethylhexyl)-2-methoxyacetamide (NBEHMOA), FeCl3 6H2O and sulfonated kerosene, was proposed in this work. Compared with TBP and N523, NBEHMOA extracted Li+ and H+ in the sequence of TBP ˃ NBEHMOA ˃ N523 and N523 ˃ TBP ˃ NBEHMOA respectively. The solution containing 5.5 mol/L LiCl and 0.5 mol/L HCl was used as the eluent in the scrubbing process. A Li+ extraction efficiency of 96.7% and 22.31 g/L Li+ in the stripping solution were achieved by the whole process with counter-current twelve stages. The extraction mechanism investigated via FT-IR spectroscopy illustrated that the metal ions Fe3+ and Li+ were mainly coordinated by the carbonyl C = O in NBEHMOA. This novel amide system can successfully achieve the cascade extraction effect for lithium, Li/Mg separation and avoid the generation of phase interface objects through counter-current extraction of lithium from brine at a lower acidity. This work provided a novel extraction system to recover lithium from the higher magnesium/lithium ratio brines.
Keywords:Solvent extraction;Lithium chloride;Amide extractant;TBP;N523;Brine
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