1 Introduction As the lightest metal with the unique properties of energy production and storage,lithium is regarded as the new century energy metal.Lithium and its compounds were widely used in various industrial fie...1 Introduction As the lightest metal with the unique properties of energy production and storage,lithium is regarded as the new century energy metal.Lithium and its compounds were widely used in various industrial fields,especially in展开更多
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- fony...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 HCI in 1.0 mol/L NaCI medium as stripping agent at R（O/A）=2. The liquid-liquid extraction mechanism and the complex of the ligand with lithium were proposed.展开更多
基金Financial support from the National Natural Science Foundation of China (21276194)the Specialized Research Fund for the Doctoral Program of Chinese Higher Education (20101208110003)the Key Pillar Program of Tianjin Municipal Science and Technology (11ZCKGX02800)
文摘1 Introduction As the lightest metal with the unique properties of energy production and storage,lithium is regarded as the new century energy metal.Lithium and its compounds were widely used in various industrial fields,especially in
基金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）.
文摘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 HCI in 1.0 mol/L NaCI medium as stripping agent at R（O/A）=2. The liquid-liquid extraction mechanism and the complex of the ligand with lithium were proposed.
