2012•The Chinese Journal of Nonferrous MetalsRequires access

Mechanisms of extraction and separation of zirconium and hafnium using mixtures of DIBK and TBP

Zhi-gao XU, Lijun Wang, Yanke Wu, Ruan Chi, Zhang Li

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.

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Key concepts: Hafnium, Zirconium, Extraction (chemistry), Materials science, Inorganic chemistry, Infrared spectroscopy, Nuclear chemistry, Analytical Chemistry (journal)