提出了一种通过溶剂萃取从废锂电池回收废液中回收锂的新方法。实验中使用的β-二酮萃取系统由苯甲酰基三氟丙酮（HBTA），三辛基氧化膦（TOPO）和煤油组成。通过实验评估了溶液的pH值，皂化度，初始锂浓度和相比等有效参数。皂化有机相可通过三级逆流萃取来萃取90％以上的锂。首先用稀盐酸溶液洗脱负载的有机相以除去非目标钠，然后用大摩尔比的6 mol / L HCl汽提以获得含4.322 mol / L锂的富锂溶液。该方法中的富锂溶液可用于制备碳酸锂或氯化锂。汽提的有机相可以循环使用，在此过程中未观察到任何沉淀或乳化现象。通过FT-IR光谱研究了HBTA-TOPO的提取机理，结果表明两种提取剂均具有较强的协同作用。热力学研究表明，锂的提取是一个放热过程，这意味着较低的温度会促进锂的提取。

这项工作提供了一种从废旧锂电池回收废水中回收锂的新颖方法。

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A novel process of lithium recovery from effluent of spent lithium batteries recycling by solvent extraction was proposed. The β-diketone extraction system used in the experiment was composed of benzoyltrifluoroacetone (HBTA), trioctylphosphine oxide (TOPO) and kerosene. The effective parameters such as solution pH value, saponification degree, initial lithium concentration and phase ratio were evaluated by experiments. More than 90% of lithium could be extracted by saponified organic phase through three-stage countercurrent extraction. The loaded organic phase was first eluted by dilute HCl solution to remove nontarget sodium, and then stripped by 6 mol/L HCl at a large phase ratio to obtain lithium-rich solution with 4.322 mol/L lithium. The lithium-rich solution from the process could be used to prepare lithium carbonate or lithium chloride. The stripped organic phase can be recycled and no crud or emulsification was observed during the process. The extraction mechanism of HBTA-TOPO was investigated via FT-IR spectroscopy, and the results indicated the two extractants showed strong synergistic effect. The thermodynamic study revealed lithium extraction is an exothermic process, which meant lower temperature promotes extraction of lithium.

This work provided a novel approach to recover lithium from effluent of spent lithium battery recycling.