中文摘要：

为了解二异丁基甲酮（DIBK）-TBP体系萃取锆铪的化学行为,分别采用斜率法和饱和容量法研究DIBK和TBP在HSCN介质中协同萃取锆铪的性能及机理,结果表明：DIBK-TBP体系萃取分离锆铪时优先萃取铪,萃取反应机理为溶剂化机理,萃合物中Zr4＋（Hf4＋）、TBP、DIBK的摩尔比为1：1：1,其萃合物组成分别为Zr（SCN）4.TBP.DIBK和Hf（SCN）4.TBP.DIBK,并通过对负载有机相进行红外光谱分析进一步确定了萃合物可能的结构式;DIBK和TBP协同使用可以改善HSCN介质下锆铪的萃取分离效果。

英文摘要：

To master the chemical behavior of the extraction of hafnium from zirconium in the diisobutyl ketone （DIBK）-TBP system and to guide the practical application of the DIBK-TBP system, the mechanism and characteristics about synergistic extraction of zirconium and hafnium by DIBK and TBP from thiocyanic acid medium were studied through the methods of slope coefficient and saturated volumetric. The results show that hafnium is extracted preferentially in DIBK-TBP system, the reactions of extraction follow the solvate theory. The composition of extracted complex was determined as n（Zr4＋（Hf4＋））：n（TBP）：n（DIBK）=1：1：1, and identified as Zr（SCN）4·TBP·DIBK and Hf（SCN）a·TBP·DIBK, and the possible synergistic extraction complexes structures were further confirmed through the infrared spectra of the loaded organic phase. The extraction and separation effect for zirconium and hafnium can be improved with synergistic mixture of DIBK and TBP.