Highly efficient and selective solvent extraction of zirconium and hafnium from chloride acid solution including amic acid extractant

甲基异丁基酮 化学 萃取(化学) 盐酸 氯化物 离子 离子液体 无机化学 环烷酸 溶剂 核化学 色谱法 催化作用 有机化学 腐蚀
作者
Shuai Ma,Fan Yang,Fengzhi Tan,Meiying Xie,Shuwen Yu,Liyan Xue,Zhiwan Li,Tianxi Hu
出处
期刊:Separation and Purification Technology [Elsevier BV]
卷期号:279: 119779-119779 被引量:20
标识
DOI:10.1016/j.seppur.2021.119779
摘要

Nuclear-grade zirconium (Zr) and hafnium (Hf) play an inevitably strategic role in the sustainable development of the nuclear industry. However, the efficient separation of Zr ions and Hf ions is still problematic due to their approximate ionic radii. This work, provides a novel strategy for separating Zr ions and Hf ions by solvent extraction using an HCl solution containing the green amic acid N, N-di-2-ethylhexyl diglycolamic acid (D2EHDGAA). The results demonstrated that D2EHDGAA in HCl solution presented excellent separation performance for Zr ions and Hf ions. The separation factor (βZr/Hf) in the simulation liquid was 11.4, and that in the zirconium oxychloride hydrolysate was 34.5 at an HCl concentration of 2.5 mol/L. In addition, the slope method shows that the concentration of Cl- in the feeding water phase plays a controlling role in the separation of Zr ions and Hf ions. Compared with HCl, HNO3 and ultrapure water, stripping can reach 94.3% at a H2SO4 concentration of 0.1 mol/L. Hopefully, the new environmentally friendly D2EHDGAA-HCl system can match the methyl isobutyl ketone (MIBK)-HSCN system for efficient and selective extraction of Zr and Hf ions and show optimistic application prospects in industry.
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