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Separation of hafnium from zirconium in HNO3 solution by solvent extraction with Cyanex572
Hydrometallurgy ( IF 4.7 ) Pub Date : 2021-04-01 , DOI: 10.1016/j.hydromet.2021.105600
Hongyang He , Fei Xu , Qiaolei Li , Panfei Dong , Jian Zheng , Chenjie Wu , Zhengyan He , Jun Qu , Zhigao Xu , Ruan Chi , Ming Wu

Extraction and separation of hafnium (Hf) from zirconium (Zr) in HNO3 solution were carried out with Cyanex572 as extractant. Hf could be selectively extracted with an optimized extraction rate of 76.8%, and the separation factor between Hf and Zr could reach up to 15.7 when the concentration of Zr(IV), Hf(IV), H+, NO3 and (NH4)2SO4 in aqueous phase were fixed at 110 g/L, 3.0 g/L, 2.6 M, 1.8 M and 0.8 M, respectively. The stoichiometry and coordination structure of the extracted complex for Hf was investigated by slope analysis, Fourier transform infrared (FT-IR) spectrometry and nuclear magnetic resonance (NMR) spectrometry. It was found that HfO2+ in nitric acid medium could be extracted into the organic phase through two routes. The dominant route was via a cation-exchange mechanism, according to 2HfO2+aq + H2A2 org + 2NO3̄ aq↔ (HfO2+)2·(NO3̄)2·A2 org + 2H+aq. Meanwhile, the subordinate route was coordinate with Pdouble bondO in Cyanex572 extractant. Therefore, it is possible to developing an effective solvent extraction system to separate Hf from Zr by utilizing Cyanex572.



中文翻译:

用Cyanex572进行溶剂萃取,从HNO 3溶液中的锆中分离ha。

以Cyanex572为萃取剂,从HNO 3溶液中的锆(Zr)中萃取和分离ha (Hf)。HF可以用的76.8%的优化的提取率,和Hf和Zr之间的分离因子选择性地提取可能达到高达15.7时的Zr(IV),铪(IV),H的浓度+,NO 3 -和(NH 4)将水相中的2 SO 4分别固定在110g / L,3.0g / L,2.6M,1.8M和0.8M。通过斜率分析,傅立叶变换红外光谱(FT-IR)和核磁共振谱(NMR)研究了所提取的Hf配合物的化学计量和配位结构。发现HfO 2+在硝酸介质中可以通过两种途径将其萃取到有机相中。占主导地位的路线是通过阳离子交换机制,根据2HfO 2+水溶液 + H 22的有机 + 2NO 3 ̄水溶液↔(HFO 2+2 ·(NO 3 ̄)2 ·2的有机 + 2H +水溶液。同时,双键在Cyanex572萃取剂中,下级路线与P O协调。因此,有可能开发出一种有效的溶剂萃取系统,以利用Cyanex572将Hf与Zr分离。

更新日期:2021-04-08
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