Although societal interest in lithium has grown due to its increased demand for manufacturing of lithium ion batteries (LIBs), recent research studies about LIB recycling with solvent extraction did not focus on Li recovery and Li remained in the raffinate contaminated with impurities. In this research presented direct Li recovery from LIB waste leachate prior to Ni and Co is a novel and promising approach.

The applied SX system (tributyl phosphate (TBP) as extractant and iron(III) chloride (FeCl₃) as co-extractant in kerosene) is known from Li separation from natural brines. Batch equilibrium experiments at room temperature were conducted with preloaded organic phase (NaCl and FeCl₃, TBP (80% (v/v)) and kerosene (20% (v/v)) and synthetic aqueous LIB waste leachate solution (1.3–1.5 g L⁻¹ Al, 14.2–17.8 g L⁻¹ Co, 1.9–2.2 g L⁻¹ Cu, 0.7–0.8 g L⁻¹ Fe, 2.4–2.7 g L⁻¹ Li, 1.9–2.1 g L⁻¹ Mn, 1.8–2.0 g L⁻¹ Ni, E = 603 mV Ag/AgCl). Loading with emphasis on the competitive extraction between Li and H⁺, substitution of MgCl₂ as chloride source and variation of the phase ratios as well as scrubbing and stripping are investigated in this research.

Lithium was selectively separated over divalent LIB metals (Mn, Cu, Co, Ni) and Al(III) from a multicomponent mixture, and the extraction ability of the system is H⁺ > Li⁺ > > LIB metals. Aiming for maximum Li extraction initial concentration of H⁺ was chosen to be 0.1 M. Substitution of MgCl₂, used in the brine systems, by AlCl₃ as chloride source promoted Li extraction (E(Li) = 87.7% for R(O/A) = 1) due to its strong salting out effect. This resulted in enhanced separation factors (β(Ni) = 2825 and β(Co) = 854 for R(O/A) = 1). Loaded organic phase was purified using 1 M LiCl +2 M AlCl₃ scrubbing solution prior stripping. Stripping with 6 M HCl in single-stage at R(O/A) = 5 resulted in stripping liquor containing 12.26 g L⁻¹, 0.02 g L⁻¹, 0.04 g L⁻¹, and 0.04 g L⁻¹ of Li, Mn, Co and Cu, respectively.

尽管由于对锂离子电池（LIB）的制造需求的增加，人们对锂的兴趣日益浓厚，但最近有关通过溶剂萃取进行LIB回收的研究并未集中在Li的回收上，而且Li仍留在被杂质污染的残液中。在这项研究中，提出了在Ni和Co之前从LIB垃圾渗滤液中直接回收Li的方法是一种新颖而有希望的方法。

所施加的SX系统（磷酸三丁酯（TBP）作为萃取剂和铁（III）氯化物（的FeCl ₃），如煤油共萃取剂）是从天然卤水中栗分离已知的。在室温下使用预加载的有机相（NaCl和FeCl ₃，TBP（80％（v / v））和煤油（20％（v / v））和合成的LIB沥滤液水溶液（1.3-1.5）进行批次平衡实验g L ^-1 Al，14.2-17.8 g L ^-1 Co，1.9-2.2 g L ^-1 Cu，0.7-0.8 g L ^-1 Fe，2.4-2.7 g L ^-1 Li，1.9-2.1 g L ^-1 Mn ，1.8-2.0克L- ^-1的Ni，E = 603毫伏的Ag / AgCl）。加载重点在李和H之间的竞争萃取⁺本研究研究了以MgCl ₂作为氯化物源的替代以及相比的变化以及洗涤和汽提。

从多组分混合物中选择性地从二价LIB金属（Mn，Cu，Co，Ni）和Al（III）分离锂，并且系统的萃取能力为H ⁺  > Li ⁺ >> LIB金属。为了最大程度地提取锂，将H ^+的初始浓度选择为0.1M。用于盐水系统中的MgCl ₂替代，由AlCl ₃作为氯化物源促进了Li的提取（R（O / A）= 1），因为它具有很强的盐析作用。这导致分离系数提高（对于R（O / A）= 1，β（Ni）= 2825和β（Co）= 854）。使用1 M LiCl +2 M AlCl ₃纯化负载的有机相在汽提之前先擦洗溶液。用6M HCl在单级在R（O / A）= 5剥离导致汽提含有12.26克L-酒^-1，0.02克L- ^-1，0.04克L- ^-1和0.04克L- ^-1的Li，分别为Mn，Co和Cu。