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• W3149198573 abstract "Extraction and separation of hafnium (Hf) from zirconium (Zr) in HNO 3 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 + , NO 3 − and (NH 4 ) 2 SO 4 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 HfO 2+ 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 2HfO 2+ aq + H 2 A 2 org + 2NO 3 ̄ aq ↔ (HfO 2+ ) 2 · (NO 3 ̄) 2 · A 2 org + 2H + aq . Meanwhile, the subordinate route was coordinate with P O in Cyanex572 extractant. Therefore, it is possible to developing an effective solvent extraction system to separate Hf from Zr by utilizing Cyanex572. • Selective extraction the minor element Hf from Zr was realized with Cyanex572-HNO 3 system. • The separation factor between Hf and Zr could reach up to 15.7. • Extraction of Hf was testified to be dominated by cation-exchange mechanism. • The structure of the extracted complex was determined as (HfO 2+ ) 2 ·( NO 3 ̄) 2 · A 2 ." @default.
• W3149198573 created "2021-04-13" @default.
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• W3149198573 date "2021-06-01" @default.
• W3149198573 modified "2023-10-16" @default.
• W3149198573 title "Separation of hafnium from zirconium in HNO3 solution by solvent extraction with Cyanex572" @default.
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• W3149198573 doi "https://doi.org/10.1016/j.hydromet.2021.105600" @default.
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