The separation of manganese from cobalt sulfate solutions is crucial in the field of spent lithium-ion battery recycling. A membrane-based microreactor is used to reveal required mass transfer characteristics as is diffusion and chemical reaction. The dependence of di-(2-ethylhexyl)phosphoric acid (D2EHPA) concentration, pH, and metal ion concentration on the extraction efficiency are investigated. A back-reaction term is introduced giving a significant influence on the effective extraction rate even at small metal complex concentrations as initial extraction rates proved to be inaccurate to describe the system. It is shown that the extraction of manganese at a pH of 3.0 is mainly diffusive while the cobalt extraction is strongly kinetically controlled. At a separating pH of 3.9 a good agreement between the model and experimental data is only given if the equilibrium back-extraction rate is considered (deviation less than 5%).

从硫酸钴溶液中分离锰对于废旧锂离子电池回收领域至关重要。基于膜的微反应器用于揭示所需的传质特性，如扩散和化学反应。研究了二 (2-乙基己基) 磷酸 (D2EHPA) 浓度、pH 和金属离子浓度对提取效率的依赖性。引入了逆反应项，即使在金属配合物浓度很小的情况下，也会对有效萃取率产生显着影响，因为初始萃取率被证明无法准确描述系统。结果表明，在 pH 值为 3.0 时锰的提取主要是扩散性的，而钴的提取则受到强烈的动力学控制。分离 pH 值为 3。