Dibutyl phosphoric acid and its acid zirconium salt as an extractant for the separation of transplutonium elements and rare earths and for their partitioning

Zilberman, B. Ya.; Fedorov, Yu. S.; Shmidt, O. V.; Esimantovskiy, V. M.; Shishkin, D. N.; Пузиков, Е. А.; Egorova, O. N.; Родионов, С. А.; Goletskiy, N. D.; Choppin, Gregory R.

doi:10.1007/s10967-007-7253-5

Cited by 7 publications

(8 citation statements)

References 16 publications

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“…The maximum is flat, and in the range of HDBP : Zr ratios from 9 to 15 changes are insignificant. To compare, the maximal extraction of TPE and REE is observed at the ratio НА : Zr = 9 at HA = HDBP [4,9] and 6 at НА = HDEHP [1,2]. Because HDBP ZS is intended for the extraction recovery of TPE and REE, further studies of the extraction behavior of Мо were performed at the ratio HDBP : Zr = 9.…”

Section: Extraction Of Mo With Hdbp Zs Solutionsmentioning

confidence: 99%

“…It was suggested to use a 0.2 M solution of HDBP ZS (HDBP : Zr = 9) in 30% TBP in paraffin hydrocarbons [4][5][6][7][8][9][10][11]. However, the Mo extraction with HDBP ZS solution was given less attention in these papers, compared to the extraction of REE and TPE, and the data we obtained previously [6-8, 12, 13] are insufficient for understanding the extraction behavior of Мо.…”

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confidence: 99%

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Extraction of molybdenum from nitric acid solutions with solutions of dibutyl hydrogen phosphate zirconium salt

et al. 2012

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The extraction of Мо with a solution of dibutyl hydrogen phosphate (HDBP) zirconium salt (ZS) in xylene and in TBP-xylene and TBP-decane mixtures was studied in comparison with the Mo extraction in similar systems without Zr. The Mo extraction is enhanced to the largest extent (by a factor of 7 with 1.5 M HNO 3 ) at the HDBP : Zr ratio of 12, but the majority of experiments were performed at the ratio HDBP : Zr = 9, characteristic of the extraction of TPE and REE. The plots of D Mo vs. HNO 3 concentration in all the cases pass through a minimum at ~3 M HNO 3 , and the minimum is the deeper, the higher the TBP concentration. At the same time, in the system with HDBP ZS at the TBP concentration in the solvent exceeding 50%, further decrease in D Mo is not observed. The dependence of the Mo distribution ratio D Mo on the HDBP concentration at a fixed ratio HDBP : Zr = 9, the composition of the saturated systems, and the spectra of the saturated and unsaturated (with respect to Mo) systems suggest formation of mixed HDBP-Zr-Mo complexes. Assumptions concerning their composition and structure were made. According to the IR data, in these complexes in the absence of TBP the nitrate ion is not coordinated to the Mo atom. Bridged structures Мо-О-Мо are not formed either. Addition of TBP leads to a decrease in D Мо in the extraction with HDBP ZS, but, at the same time, the slope of the dependence of D Mo on the HDBP concentration increases, and the limiting capacity of the solvent for Mo also somewhat increases. These effects are primarily attributed to an increase in the HNO 3 concentration in the organic phase in the presence of TBP.The use of dialkyl hydrogen phosphate zirconium salts (HDAP ZSs) for partitioning of long-lived radionuclides of transplutonium (TPE) and rare earth (REE) elements and Sr is known for a relatively long time [1-3], but the extraction behavior of Mo was not examined in these studies.In our papers on TPE and REE partitioning, it was suggested to use acidic zirconium salt of dibutyl hydrogen phosphate (HDBP ZS) as TBP-compatible extractant, because HDBP is the first product of TBP degradation and is removed by washing the extractant with a Na 2 CO 3 solution. It was suggested to use a 0.2 M solution of HDBP ZS (HDBP : Zr = 9) in 30% TBP in paraffin hydrocarbons [4][5][6][7][8][9][10][11]. However, the Mo extraction with HDBP ZS solution was given less attention in these papers, compared to the extraction of REE and TPE, and the data we obtained previously [6-8, 12, 13] are insufficient for understanding the extraction behavior of Мо. For this purpose, it is necessary to study systematically the role of various components of the system in the extraction, including the role of TBP.The latter fact made it necessary to perform additional studies on the Mo extraction with HDBP ZS solutions in xylene and in 30% TBP/xylene. The results of these studies are discussed below together with data for the system HDBP ZS-30% TBP/decane. This paper is a part of a cycle of papers on the Mo extraction from nitri...

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Section: Extraction Of Mo With Hdbp Zs Solutionsmentioning

confidence: 99%

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confidence: 99%

Extraction of molybdenum from nitric acid solutions with solutions of dibutyl hydrogen phosphate zirconium salt

et al. 2012

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“…It is also known that the use of HDEHP in a mixture with saturated hydrocarbons for the Mo extraction requires introduction of TBP as solubilizer [9], and TBP appre- 3 , is given in [10]. Oxalic acid was used for the Mo backwashing in [11], which allowed simultaneous backwashing of Fe [12]. Experiments in [9][10][11][12] were performed with uranium-free solutions.…”

Section: Introduction Analytical Reviewmentioning

confidence: 99%

“…Oxalic acid was used for the Mo backwashing in [11], which allowed simultaneous backwashing of Fe [12]. Experiments in [9][10][11][12] were performed with uranium-free solutions.…”

Section: Introduction Analytical Reviewmentioning

confidence: 99%

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Development and trials of a process for extraction recovery of 99Mo for medical purposes from dissolved irradiated uranium targets

et al. 2015

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A process was developed for extraction recovery of 99 Мо from irradiated enriched uranium target. Dissolution of the uranium-aluminum composite in nitric acid in the presence of fluoride ions with the addition of mercury ions, which are subsequently separated by precipitation in the form of iodide, was suggested. Conditions were determined for joint recovery of uranium and molybdenum into the organic phase with 10-15% solutions of HDEHP in a paraffin diluent in the presence of equimolar amounts of TBP, and also for selective backwashing of Mo into a strongly acidic H 2 O 2 solution with the backwash reflux. The efficiency of using a mixture of DTPA with methylamine carbonate for uranium backwashing and solvent regeneration was demonstrated. The recovery and separation process was successfully tested on simulated and real solutions in 20-and 19-step cascades of centrifugal contactors with the feed adjuster without Mo backwash reflux and with its reflux, respectively.

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Concentrating 99Mo from LEU by extraction with higher hydroxamic acids solutions in alcohols C8–C10

Naumov

Goletskiy

Zilberman

et al. 2018

J Radioanal Nucl Chem

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Dibutyl phosphoric acid and its acid zirconium salt as an extractant for the separation of transplutonium elements and rare earths and for their partitioning

Cited by 7 publications

References 16 publications

Extraction of molybdenum from nitric acid solutions with solutions of dibutyl hydrogen phosphate zirconium salt

Extraction of molybdenum from nitric acid solutions with solutions of dibutyl hydrogen phosphate zirconium salt

Development and trials of a process for extraction recovery of 99Mo for medical purposes from dissolved irradiated uranium targets

Concentrating 99Mo from LEU by extraction with higher hydroxamic acids solutions in alcohols C8–C10

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