本文叙述了用D2EHPA分别与TBP、P5208、TRPO的煤油混合溶剂从稀硫酸溶液中萃取铀(Ⅵ)的协同及反协同效应。研究了影响协同和反协同效应的因素及其出现的规律。对部分实验结果进行了初步讨论。当有机相中的铀浓度小于50％理论饱和容量时则产生明显的协同效应;若大于50％,便出现反协同效应。研究结果还表明,控制克分子比即可避免该体系的反协同效应。 This article describes the synergistic and counter-synergistic effect of extracting uranium (Ⅵ) from dilute sulfuric acid solution with D2EHPA mixed with kerosene of TBP, P5208 and TRPO respectively. The factors that affect the synergy and anti-synergistic effect and the law of their appearance are studied. Some preliminary experimental results were discussed. When the concentration of uranium in the organic phase is less than 50% of the theoretical saturation capacity, there is a clear synergistic effect; if it is greater than 50%, an anti-synergistic effect will appear. The results also show that controlling the molar ratio avoids the anti-synergistic effect of the system.