The separation of copper and nickel in ammonia solution is challenging in hydrometallurgy. In this work, an emulsion liquid membrane (ELM) was constructed using M5640 as an extractant, Span 80 as a non-ionic surfactant, and kerosene as a solvent for the selective separation of Cu(II) and Ni(II) in ammoniacal/ammonium chloride solutions. First, the stability of the emulsion liquid membrane was evaluated, and the parameters were optimized by response surface methodology (RSM). Subsequently, the critical factors affecting the separation of copper and nickel in ammonia solution, including extractant concentration, feed pH, internal phase concentration, and emulsification speed, were systematically studied. The results show that > 99.9 % of Cu(II) migrates from the feed phase to the internal phase, while only < 4.2 % of Ni (II) migrates. The separation coefficient of Cu(II) and Ni(II) reaches 114,000, indicating that the emulsion membrane can effectively separate Cu(II) and Ni(II) in an ammonia medium. Furthermore, the discussion on the separation mechanism shows that the difference in the reaction kinetics of Cu(NH₃)₄²⁺ and Ni(NH₃)₆²⁺ with M5640 is the main reason for the selective separation of Cu(II) and Ni(II) in ammonia solution.

氨溶液中铜和镍的分离在湿法冶金中具有挑战性。在这项工作中，以 M5640 作为萃取剂，Span 80 作为非离子表面活性剂，煤油作为溶剂构建了一种乳液液膜 (ELM)，用于选择性分离氨水中的 Cu(II) 和 Ni(II)。氯化铵溶液。首先对乳化液膜的稳定性进行评价，并通过响应面法对参数进行优化。（RSM）。随后，系统研究了影响氨溶液中铜和镍分离的关键因素，包括萃取剂浓度、进料pH、内相浓度和乳化速度。结果表明 > 99.9 % 的 Cu(II) 从进料相迁移到内相，而只有 < 4.2 % 的 Ni (II) 迁移。Cu(II)和Ni(II)的分离系数达到114,000，表明乳液膜可以有效分离氨介质中的Cu(II)和Ni(II)。此外，对分离机理的讨论表明，Cu(NH ₃)₄²⁺和 Ni(NH₃)₆²⁺M5640 是选择性分离氨溶液中 Cu(II) 和 Ni(II) 的主要原因。