(1. 武漢工程大學(xué) 綠色化工過程教育部重點實驗室，武漢 430073；
2. 北京有色金屬研究總院 礦物資源與冶金材料研究所，北京 100088)
摘 要: 為了解二異丁基甲酮(DIBK)-TBP體系萃取鋯鉿的化學(xué)行為，分別采用斜率法和飽和容量法研究DIBK和TBP在HSCN介質(zhì)中協(xié)同萃取鋯鉿的性能及機理，結(jié)果表明：DIBK-TBP體系萃取分離鋯鉿時優(yōu)先萃取鉿，萃取反應(yīng)機理為溶劑化機理，萃合物中Zr4+(Hf4+)、TBP、DIBK的摩爾比為1:1:1，其萃合物組成分別為Zr(SCN)4∙TBP∙DIBK和Hf(SCN)4∙TBP∙DIBK，并通過對負載有機相進行紅外光譜分析進一步確定了萃合物可能的結(jié)構(gòu)式；DIBK和TBP協(xié)同使用可以改善HSCN介質(zhì)下鋯鉿的萃取分離效果。
關(guān)鍵字: 二異丁基甲酮；鋯；鉿；萃取；機理
（1. Key Laboratory for Green Chemical Process of Ministry of Education, Wuhan Institute of Technology,
Wuhan 430073, China;
2. Division of Mineral Resources, Metallurgy and Materials, General Research Institute for Nonferrous Metals,
Beijing 100088, China）
Abstract: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)4∙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.
Key words: diisobutyl ketone; zirconium; hafnium; extraction; mechanism
