Stoichiometric relation for extraction of zirconium and hafnium from acidic chloride solutions with Versatic Acid 10

Lee, Hwa Young; Kim, Sung Gyu; Oh, Jong Kee

doi:10.1016/j.hydromet.2003.08.004

Cited by 28 publications

(12 citation statements)

References 11 publications

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“…Moreover, it is noticed that the percentage extraction of Hf(IV) seemed to be higher than that of Zr(IV) by Versatic acid. Lee et al reported 17) that Zr(IV) and Hf(IV) could be extracted by Versatic acid following cation exchange extraction mechanism from dilute hydrochloride solutions (pH around 2), as shown in Table 2. The extraction reaction with Versatic acid was suggested to be as:…”

Section: Solvent Extraction Of Zr(iv) and Hf(iv) Bymentioning

confidence: 99%

Solvent Extraction of Zr(IV) and Hf(IV) from Sulfuric Acid Solutions by Acidic Extractants and Their Mixtures with TBP

Wang¹,

Lee

2016

Journal of the Korean Institute of Resources Recycling

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주제어 : 지르코늄, 하프늄, 분리, 황산, 양이온계 추출제 AbstractSeparation of Zr(IV) and Hf(IV) from sulfuric acid solutions was investigated by extraction with several acidic extractants such as Versatic acid, LIX 63, and Cyanex 301. From strong sulfuric acid solutions, the separation of Zr(IV) and Hf(IV) by Versatic acid and LIX 63 was not possible, while selective extraction of Hf(IV) over Zr(IV) was obtained with Cyanex 301. However, the extraction percentage of the two metals was much lower compared to that by D2EHPA. Mixing of TBP with Cyanex 301 and D2EHPA led to negative effect on the extraction and separation of the two metal ions. The difference in the extraction reaction and separation selectivity between HCl, HNO 3 and H 2 SO 4 media with each extractant was discussed.

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Section: Solvent Extraction Of Zr(iv) and Hf(iv) Bymentioning

confidence: 99%

Solvent Extraction of Zr(IV) and Hf(IV) from Sulfuric Acid Solutions by Acidic Extractants and Their Mixtures with TBP

Wang¹,

Lee

2016

Journal of the Korean Institute of Resources Recycling

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“…In agreement with the values of the zirconium and hafnium equilibrium constants for solutions of the same ion concentration, it is concluded that hafnium is hydrolyzed less than zirconium. 10,11 Consequently, solutions with a maximum 3 d aging time can be used with no difficulties.…”

Section: Aging Effect On the Stability Of Zirconium And Hafnium Solutmentioning

confidence: 99%

Proposal of a New Hf(IV)/Zr(IV) Separation System by the Solvent Extraction Method

Saberyan¹,

Meysami

Rashchi

et al. 2008

Chin. J. Chem.

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A liquid-liquid extraction study has been conducted to separate hafnium from zirconium, using Cyanex 301 in kerosene. Noticeably, it is the first time that Cyanex 301 is utilized to separate Hf(IV) from Zr(IV). In this series of experiments, several parameters influencing the separation have been investigated, such as the initial pH, the extractant concentration, the metal ion concentration, the temperature, the type of the diluents and the salt addition. Regarding the aging of the Zr(IV) and Hf(IV) solutions, the solutions with a maximum 3 d aging time could be used with no difficulties. It was observed that the initial pH increase caused an increase in the Zr(IV)/Hf(IV) separation factor. Moreover, the distribution decreased with the temperature increase, suggesting that the reaction is exothermic. In agreement with the resulting data, the optimum separation factor illustrates the value of 7 at a pH of 4.00 in the presence of NaCl as an added salt. The attractive characteristics of the presently designed method are the use of low acidic nitrate solutions, the lack of using thiocyanate and a higher extractability of hafnium-Cyanex 301 relative to zirconium-Cyanex 301 complexes.

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“…For this reason, it is necessary to separate the hafnium from zirconium, although complicated and expensive separation methods are required to remove the hafnium. At the present time, solvent extraction processes are employed on a commercial scale to separate hafnium from zirconium [3]. In solvent extraction a mixtures of immiscible solvents is used.…”

Section: Introductionmentioning

confidence: 99%

Structure and Dynamics of Zr<sup>4+</sup> in Aqueous Solution: An Ab Initio QM/MM Molecular Dynamics Study

2015

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Stoichiometric relation for extraction of zirconium and hafnium from acidic chloride solutions with Versatic Acid 10

Cited by 28 publications

References 11 publications

Solvent Extraction of Zr(IV) and Hf(IV) from Sulfuric Acid Solutions by Acidic Extractants and Their Mixtures with TBP

Solvent Extraction of Zr(IV) and Hf(IV) from Sulfuric Acid Solutions by Acidic Extractants and Their Mixtures with TBP

Proposal of a New Hf(IV)/Zr(IV) Separation System by the Solvent Extraction Method

Structure and Dynamics of Zr<sup>4+</sup> in Aqueous Solution: An Ab Initio QM/MM Molecular Dynamics Study

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