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研究了ＳＫＳＥ混合萃取剂在高氯离子浓度和弱酸性条件下，以ＦｅＣｌ３为共萃取剂从高镁卤水中萃取锂的反应。测定了ＳＫ和ＳＥ的浓度对萃取的影响。用化学分析法、斜率法确定萃合物组成为ＬｉＦｅＣｌ４·ＳＫ·２ＳＥ；红外光谱分析认为在此体系中萃取锂为溶剂化萃取机理，ＳＫ中Ｃ＝Ｏ键和ＳＥ中Ｐ＝Ｏ、Ｃ－Ｏ键上的氧原子主要参与键合配位，其萃取反应方程式为Ｌｉ＋（ａ）＋ＦｅＣｌ－４（ａ）＋ＳＫ（ｏ）＋２ＳＥ（ｏ）＝（ＬｉＦｅＣｌ４·ＳＫ·２ＳＥ）（ｏ）
The reaction of extracting SK from high magnesium brine by using SKSE mixed extractant under the conditions of high chloride concentration and weak acidity was studied. The effect of SK and SE concentrations on extraction was determined. The composition of the complex was determined as LiFeCl4 · SK · 2SE by the method of chemical analysis and slope method. The infrared spectroscopic analysis showed that lithium was the solvent extraction mechanism in this system. The C = O bond in SK and P = O, C- The oxygen atom on the O bond is mainly involved in the bonding coordination. The extraction reaction equation is Li + (a) + FeCl-4 (a) + SK (o) + 2SE (o) = (LiFeCl4 · SK · 2SE)