The influence of tributyl phosphate on molybdenum extraction with solutions of dibutyl phosphoric acid

Goletskiy, N. D.; Zilberman, B. Ya.; Fedorov, Yu. S.; Khonina, I. V.; Kukharev, D. N.

doi:10.1007/s10582-006-0543-2

Cited by 4 publications

(7 citation statements)

References 5 publications

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“…Figure 2 shows the dependences of the Mo distribution ratio on the HNO 3 concentration in the extraction with a 0.2 M HDBP ZS solution at various concentrations of TBP in xylene and decane. These curves pass through a minimum at an HNO 3 concentration of 3-5 M. Similar minimum was observed in the systems with HDBP without Zr [14,16], and also with HDEHP [16]. In our case, along with descending and ascending branches in Fig.…”

Section: Extraction Of Mo With Hdbp Zs Solutionssupporting

confidence: 87%

“…2c) the slope of the descending branch from the shape observed in the system with HDBP in TBP/decane without Zr [14]. At HNO 3 concentration exceeding 4 M, the Mo distribution ratios with HDBP ZS and HDBP practically coincide.…”

Section: Extraction Of Mo With Hdbp Zs Solutionsmentioning

confidence: 85%

“…This paper is a part of a cycle of papers on the Mo extraction from nitric acid solutions with solvents containing HDBP and TBP separately and in combination [14][15][16]. In this study we used the same devices and methods as in [14][15][16]. The Zr solution for preparing HDBP ZS was prepared as described in [17].…”

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confidence: 99%

“…In addition, HBP extracts from the aqueous phase appreciable amounts of HNO 3 : with 30% TBP in a diluent (~1 M), the content of HNO 3 in the organic phase reaches 0.22 M, compared to 0.06 M without TBP [16,22]. Furthermore, TBP itself can extract molybdic acid to an appreciable extent from supersaturated solutions [14]. Finally, TBP molecules can principally coordinate to metal ions, although in the case of HDBP ZS and Мо(VI) such coordination probably does not take place.…”

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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 Solutionssupporting

confidence: 87%

Section: Extraction Of Mo With Hdbp Zs Solutionsmentioning

confidence: 85%

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

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“…Studies on the separation of Mo from high-level liquid waste have been carried out using various techniques, such as solvent extraction [4][5][6], resin adsorption [7,8], and precipitation [9,10]. Among these methods, solvent extraction is an effective method for dealing with a large amount of liquid waste.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Bromo-Group in 5-Octyloxymethyl-8-quinolinol on the Solvent Extraction of Molybdenum(VI) from Strongly Acidic Solutions

Ohashi

Fujimine

Ishioka

et al. 2010

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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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The influence of tributyl phosphate on molybdenum extraction with solutions of dibutyl phosphoric acid

Cited by 4 publications

References 5 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

Effect of the Bromo-Group in 5-Octyloxymethyl-8-quinolinol on the Solvent Extraction of Molybdenum(VI) from Strongly Acidic Solutions

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

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