Thermodynamics of uranium extraction from nitric acid solution by TBP loaded on inert supporting material (original) (raw)
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Influence of TBP on the extraction of uranium(VI) from nitric acid media by N,N-dibutyldecanamide
Journal of Radioanalytical and Nuclear Chemistry, 1998
The partition of uranium(VI) between nitric acid and N,N-dibutyldecanamide (DBDEA) in kerosene has been investigated at various concentrations of nitric acid, extractant and salting-out agent LiNO 3. The mechanism of extraction is discussed in the light of the results obtained. The effect of TBP on the extraction of uranium(VI) with DBDEA has also been considered. There is an apparent synergistic effect with these two extractants at low concentration of TBP, however, one sees a decrease in extraction distribution at higher concentration. IR spectra show that there is no apparent interaction between the two kinds of extractants. The stoichiometry of the synergistic extracted species has been determined.
Radiochimica Acta, 2000
A simple, efficient and economical liquid-liquid extraction method has been developed for quantitative extraction of uranium from 2 M HNO 3 using di-n-butyl sulfoxide in petroleum ether. The dependence of the partition reaction of U(VI) on the concentration of HNO 3 , extractant and temperature was studied. The reaction was found to be inversely dependent upon the temperature and the values for related thermodynamics functions (∆H, ∆S, ∆G) for extraction equilibrium were determined to be −33.6 kJ/mol, −1.29 kJ/mol/degree and −0.11 kJ/mol/degree, respectively. The effect of Al(NO 3 ) 3 as salting-out agent and diverse ions on the extraction was examined. The salting-out agent slightly enhanced the extraction. All cations studied have showed negligible effect on the extraction, whereas phosphate and fluoride interfered seriously. Among others, oxalate, citrate and sulphide ions affect the extraction to a lesser extent. Uranium was successfully extracted from a synthetic mixture of Ti +4 , Zr +4 , Hf +4 and Th +4 using EDTA as masking agent. Among strippants, deionized water was found most suitable, and the recovery of uranium was noted to be ≥ 96%. The stoichiometric composition of the extracted species was found to be UO 2 (NO 3 ) 2 · 2DBSO. The extraction mechanism is discussed on the basis of the results obtained. The extractant has high loading as well as recycling capacity without any degradation. The method was also applied to the Standard Reference Material (NBL-49) and the measured value was found to be in agreement with the reported value within ±2% deviation.
Physico chemical study on extraction of uranium
Indian Journal of Pure & Applied Physics, 2017
In extraction technology, the sample pretreatment and particle disruption is an important aspects for analysis of extraction efficiency of any blended chemicals. This analytical study can be performed with the propagation of high energy ultrasound due to its characteristic property like high frequency and high wavelength comparable to atomic and subatomic dimension. This paper describes the effect of ultrasonic wave and sonication effect for extraction of uranyl nitrate with optimum blended solvent methyl iso-butyl ketone (MIBK). The result of physico-chemical properties well establishes the supporting environment for extraction of uranium (IV) from uranyl nitrate using 40% of MIBK at room temperature and for the low frequency ultrasonic wave.