High-efficient and selective extraction of Hf over Zr with DIBK-P350 synergistic extraction system

Wu, Ming; He, Hongyang; Xu, Fei; Zhang, Xu; Zhang, Wenjie; He, Zhengyan; Qu, Jun; Chi, Ruan; Huang, Lingyun

doi:10.1016/j.seppur.2018.11.043

Cited by 24 publications

(3 citation statements)

References 36 publications

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“…The effect of phase ratios on the stripping ratio of Zr and Hf is shown in Figure 14. As shown in Figure 14, with the increase in the volume ratio of the aqueous phase, the stripping ratio of Hf increased, and that of Zr first increased and then decreased, which was similar to the study of Wu et al [26]. The separation efficiency between Zr and Hf was…”

Section: Stripping Of Zr and Hf From Loaded Mibksupporting

confidence: 86%

“…where α and β represented the molar ratio of H + /SCN − and MIBK/H α SCN α−11 , respectively. The slope method is a classical method to investigate stoichiometry and mechanisms in the extraction thermodynamics [17,19,26]. The concentration of free extractant should be theoretically used in stoichiometric analysis using the slope method.…”

Section: Extraction Of Scn −mentioning

confidence: 99%

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The Extraction Mechanism of Zirconium and Hafnium in the MIBK-HSCN System

Xiong,

Li,

Zhang

et al. 2024

Separations

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The extraction of zirconium (Zr) and hafnium (Hf) in methyl isobutyl ketone (MIBK)—thiocyanic acid (HSCN) system has been widely used in the production of nuclear-grade zirconium and hafnium in industry, while the extraction mechanism was not adequately studied. In this study, the extraction and stripping equilibrium of Zr and Hf in the MIBK-HSCN system was studied. The results showed that elevated HCl concentration can increase the distribution ratio of SCN− and decrease that of Zr/Hf in organic phase. In the stripping process, HCl concentration and the Organic/Aqueous (O/A) phase ratio played important roles. The mechanism of the extraction reaction was discussed by considering the stoichiometric relationship of possible reaction equations and corresponding equilibrium constants. The results indicated that SCN− could be extracted into MIBK as HSCN·MIBK. Meanwhile, SCN− could also be extracted into MIBK by complexing with metal (Zr or Hf). The molar ratios of MIBK to the complexes of Zr and Hf have been found to be 5.34 and 5.03, respectively. With the increase in the initial concentration of HCl in the aqueous phase, the complexation molar ratios of SCN− to Zr and Hf increased first and then decreased, and so do the extraction equilibrium constants, which might be due to the extraction competition of HSCN and metal complexes.

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Section: Stripping Of Zr and Hf From Loaded Mibksupporting

confidence: 86%

Section: Extraction Of Scn −mentioning

confidence: 99%

The Extraction Mechanism of Zirconium and Hafnium in the MIBK-HSCN System

Xiong,

Li,

Zhang

et al. 2024

Separations

View full text Add to dashboard Cite

show abstract

“…20 Reddy et al reported applying a series of isoxazoline extractants to separate zirconium and hafnium. 21 In addition to a single extractant, a collaborative extraction system using two extractants (TOPO-N1923, 22 DIBK-P350 23 ) has also been reported. Nevertheless, most of the above extraction systems give priority to zirconium extraction.…”

Section: Introductionmentioning

confidence: 99%