Abstract A novel extraction process to recover lithium ions from simulated salt lake brines with high Mg/Li ratio was developed. Tributyl phosphate (TBP), FeCl3 and diethyl succinate were used as extractant, co-extraction agent and diluent, respectively. Effects of extraction conditions containing the volume concentration of TBP, Fe/Li molar ratio and O/A phase ratio on extraction performances were studied. The highest one-stage extraction efficiency of lithium ions and separation factor were about 65% and 350, respectively. In addition, the third phase did not appear over all the volume concentrations of TBP. HCl + MgCl2 and HCl + NaCl were used as washing and stripping agents, respectively. Effects of washing and stripping conditions on washing and stripping performances were investigated too. Mg(OH)2 and MgCO3 were used as regeneration agents to regenerate the organic phase. The extraction efficiency of lithium ions remained at about 53% during reusing the organic phase ten times, demonstrating that the proposed extraction system had good stability and reusability.

中文翻译：

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以TBP为萃取剂、FeCl3为共萃取剂的溶剂萃取法从盐湖卤水中回收锂

摘要 开发了一种从高镁锂比模拟盐湖卤水中提取锂离子的新工艺。磷酸三丁酯 (TBP)、FeCl3 和琥珀酸二乙酯分别用作萃取剂、共萃取剂和稀释剂。研究了TBP体积浓度、Fe/Li摩尔比和O/A相比等萃取条件对萃取性能的影响。锂离子的最高一级提取效率和分离因子分别约为65%和350。此外，第三相没有出现在 TBP 的所有体积浓度上。HCl + MgCl2 和 HCl + NaCl 分别用作清洗剂和汽提剂。还研究了洗涤和剥离条件对洗涤和剥离性能的影响。Mg(OH)2和MgCO3用作再生剂以再生有机相。在有机相重复使用10次期间，锂离子的提取效率保持在53%左右，表明所提出的提取系统具有良好的稳定性和重复使用性。