Solvent extraction of thorium from nitrate medium by TBP, Cyanex272 and their mixture

Shaeri, Mostaan; Torab‐Mostaedi, Meisam; Kelishami, Ahmad Rahbar

doi:10.1007/s10967-014-3718-5

Cited by 17 publications

(15 citation statements)

References 25 publications

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“…Organic extractants have been playing an important role in separating uranium from thorium for a long time due to their chelating properties. Phosphates/phosphonates for U(VI)/Th(IV) purification are especially widely utilized in the extraction and recovery of hexavalent uranyl (UO 2 2+ ) and tetravalent thorium from effluents of nuclear power plants. − However, a solution of phosphates/phosphonates (like tri- n -butyl phosphate, TBP) in dodecane or other inert aliphatics is often used in practice, as pure TBP alone is too viscous to operate with . This may lead to a massive volume of organic wastes and introduce additional issue to deal with.…”

Section: Introductionmentioning

confidence: 99%

Polypropylene Modified with Amidoxime/Carboxyl Groups in Separating Uranium(VI) from Thorium(IV) in Aqueous Solutions

Xiong

Liu

et al. 2017

ACS Sustainable Chem. Eng.

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A majority of U/Th reprocessing studies are hampered in the production of large amounts of radioactive waste during extraction with organic complexes from highly acidic solutions. Polypropylene grafted with amidoxime/ carboxyl groups (PPAC), which exhibits selective binding toward U(VI), can help reduce organic waste. Batch studies on PPAC separating U(VI) from U(VI)/Th(IV) mixture in acidic to weak alkaline solution with complexing agent EDTA were carried out. The result suggested a much better affinity of PPAC to U(VI) over Th(IV). The pH effect study suggested the largest U/Th mass ratio at pH ∼8. FTIR spectra at different pHs indicated most of the carboxyl and amidoxime functional groups were protonated at lower pH, while with increasing pH, the deprotonating degree increased correspondingly. X-ray diffraction analysis showed U(VI) and Th(IV) could both enter the crystal lattice, resulting in smaller diffraction angle which was associated with U(VI) and Th(IV) adsorption capacity. This work revealed polymer or other material with amidoxime/carboxyl groups is a promising candidate for deployment as a uranium adsorbent in U/Th reprocessing.

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Section: Introductionmentioning

confidence: 99%

Polypropylene Modified with Amidoxime/Carboxyl Groups in Separating Uranium(VI) from Thorium(IV) in Aqueous Solutions

Xiong

Liu

et al. 2017

ACS Sustainable Chem. Eng.

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“…Most of separation and recovery was done employing synergetic effects of two or more extractants (Noori et al 2014;Shaeri et al 2015;Tavakoli and Dreisinger 2014;Wu et al 2012), however the occurrence of white turbidity and a third phase formation was the major problem observed during stripping of V from the loaded organic (Li et al 2011;Sahu et al 2013). The present study focussed on the extraction studies of V along with closely associated metal ions from nitrate solutions and its quantitative recovery from spent V 2 O 5 catalyst employing Cyanex 272 without synergetic effect, which certainly enhance financial viability of methodology.…”

Section: Cyanex 272 or Bis(244-trimethylpentyl)phosphinic Acidmentioning

confidence: 99%

“…TOPO shows high extraction coefficient but poor selectivity. It is known to extract approximately 30 metal ions from aqueous solutions (Shaeri et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Separation and recovery of vanadium from spent vanadium pentaoxide catalyst by Cyanex 272

Painuly

2015

Environ Syst Res

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Background: The contact process preferably used vanadium pentaoxide as catalyst to increase the rate of reaction of producing sulphuric acid. Sulfuric acid plants regularly require catalyst replacement in order to cope with process improvements. The spent catalyst is considered as hazardous solid waste and cannot be discarded untreated owing to presence of high amount of vanadium and other associated metals. Because of significant environment implications of spent catalyst wastes, it is imperative to recover valuable metals present in them. The recovery of precious materials or metals from waste will not only help in mitigating environment problem due to metal pollution but also help improve the economy of the country. The purpose of this research work is to develop method to recover vanadium from spent V 2 O 5 catalyst. Results: The detailed study of extraction, separation and recovery of vanadium from leached spent catalyst solution of composition; V, 3.6% ; Al, 2.1%; Fe, 1.3%; Ti, 0.8% and less than 1 % of Cr and Pb is reported in this paper. Cyanex 272 (bis (2, 4, 4-trimethylpentyl) phosphinic acid) has been explored for the recovery of vanadium from spent V 2 O 5 catalyst. The effects of different parameters like, pH, solvent concentration, organic to aqueous ratio etc. were optimised for the complete extraction and recovery of vanadium. Conclusions: The proposed procedure gives high purity vanadium with almost a quantitative yield (~99%) and of course free from closely associated metals. The extractants could be reused up to ten cycles with no significant change in the extraction capability.

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“…Cyanex 301 and Cyanex 302 [7], Cyanex 923 [8] were successfully used for the extractive separation of thorium(IV). Apart from that the extraction study of thorium(IV) was also investigated by several extractants like di-(2-ethylhexyl) 2-ethylhexyl phosphonate [9] bis(2,4,4-trimethylpentyl) phosphinic acid (Cyanex 272) [10]. Amberlite LA-1 or LA-2 [11], N-methyl-N,N,Ntrioctylammonium chloride [12] mixture of N-n-octylaniline and trioctylamine [13] are successfully employed for the extraction of thorium(IV).…”

Section: Introductionmentioning

confidence: 99%

Highly proficient extraction separation of thorium(IV) from sulfuric acid solution using N-n-decylaniline: real sample analysis

Patil¹,

Suryavanshi

Mulik³

et al. 2020

J Radioanal Nucl Chem

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Herein we have developed solvent extraction method for thorium(IV) with 0.15 M N-n decylaniline in xylene from 0.5 M H 2 SO 4. Physicochemical parameters like acid concentration, amine concentration, equilibrium time, phase ratio, diluent, loading capacity to name a few were optimized for the quantitative extraction of thorium(IV). The back-extraction of thorium(IV) from organic phase was done with 0.1 M nitric acid and determined complexometrically. To extend the utility of this method, binary and ternary mixture separation, extraction of thorium(IV) from monazite sand and gas mantle are also investigated.

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Solvent extraction of thorium from nitrate medium by TBP, Cyanex272 and their mixture

Cited by 17 publications

References 25 publications

Polypropylene Modified with Amidoxime/Carboxyl Groups in Separating Uranium(VI) from Thorium(IV) in Aqueous Solutions

Polypropylene Modified with Amidoxime/Carboxyl Groups in Separating Uranium(VI) from Thorium(IV) in Aqueous Solutions

Separation and recovery of vanadium from spent vanadium pentaoxide catalyst by Cyanex 272

Highly proficient extraction separation of thorium(IV) from sulfuric acid solution using N-n-decylaniline: real sample analysis

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