With the intensity of resource scarcities and environmental problems, the disposal and recovery of spent lithium-ion batteries, especially recovery of valuable metals, becomes vital. In this work, a method of co-extracting nickel, cobalt, manganese and being separated from lithium by single-stage solvent extraction is proposed. The extraction and separation process of D2EHPA was studied. The effects of extractant concentration, saponification percentage, extraction time and O:A on the extraction efficiency of D2EHPA were systematically studied. Nearly 100% manganese, 94% cobalt and about 90% nickel were co-extracted and separated from lithium using D2EHPA in kerosene by single-stage extraction. The maximum value of separation factors (β_Ni/Li, β_Co/Li and β_Mn/Li) was 13.03, 23.42 and 1904.24. The mathematical model of extraction of four ions was developed by combination of Levenberg-Marquardt method and Universal Global Optimization method. The proposed extraction model accurately fits the experimental data and helps to predict the extraction efficiency of each metal under the corresponding conditions.

随着资源稀缺和环境问题的加剧，废旧锂离子电池的处理和回收，尤其是有价金属的回收变得至关重要。本文提出了一种采用单级溶剂萃取法共萃取镍、钴、锰并与锂分离的方法。研究了D2EHPA的提取分离工艺。系统研究了提取剂浓度、皂化百分比、提取时间和O:A对D2EHPA提取效率的影响。使用 D2EHPA 在煤油中通过单级萃取，将近 100% 的锰、94% 的钴和约 90% 的镍与锂共萃取和分离。分离因子的最大值 ( β _Ni/Li , β _Co/Li和β _Mn/Li ) 为 13.03、23.42 和 1904.24。结合Levenberg-Marquardt方法和通用全局优化方法建立了四种离子提取的数学模型。所提出的提取模型准确拟合了实验数据，有助于预测相应条件下每种金属的提取效率。