(1. 武漢工程大學(xué) 綠色化工過程教育部重點(diǎn)實(shí)驗(yàn)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)和二(2-乙基己基)磷酸(P204，HA)組成的混合萃取劑萃取鋯和鉿的化學(xué)行為，分別采用斜率法和飽和容量法研究DIBK-P204體系在HSCN介質(zhì)中萃取鋯和鉿的性能及機(jī)理。結(jié)果表明：DIBK-P204體系萃取分離鋯和鉿時(shí)優(yōu)先萃取鉿，具有正協(xié)萃能力，萃取反應(yīng)為加合反應(yīng)機(jī)理；萃合物中Zr4+( Hf4+)、P204、DIBK的摩爾比為1:2:1，其萃合物組成分別為Zr(SCN)3？HA2？DIBK和Hf(SCN)3？HA2？DIBK；采用紅外光譜分析負(fù)載有機(jī)相，推測(cè)萃合物可能存在的結(jié)構(gòu)。因此，DIBK和P204混合使用可以改善HSCN介質(zhì)下鋯和鉿的萃取分離效果。
關(guān)鍵字: 鋯；鉿；萃取分離；機(jī)理
（1. Key Laboratory for Green Chemical Process, 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 and zirconium in the mixture of diisobutyl ketone (DIBK) and P204, the characteristics and mechanism about the extraction of zirconium and hafnium by DIBK-P204 system in thiocyanic acid (HSCN) medium were studied through the methods of slope coefficient and saturated volumetric. The results show that hafnium is extracted preferentially by DIBK-P204 system, the synergistic extractive effects are found, and the extraction reactions follow the mechanism of the addition reactions. The composition of extracted complex is determined as n(Zr4+(Hf4+)):n(P204):n(DIBK)=1:2:1 and the extracted complexes are identified as Zr(SCN)3•HA2•DIBK and Hf(SCN)3•HA2•DIBK, and the possible synergistic extraction complex structures are suggested through infrared spectrum analysis of the loaded organic phase. The extraction and separation effect of zirconium and hafnium can be improved with synergistic mixture of DIBK and P204.
Key words: zirconium; hafnium; extraction separation; mechanism
