Synergistic extraction of uranium with mixtures of PC88A and neutral oxodonors |
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Authors: | S Biswas P N Pathak D K Singh S B Roy V K Manchanda |
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Institution: | (1) Uranium Extraction Division, Bhabha Atomic Research Centre, Mumbai, 400085, India;(2) Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai, 400085, India;(3) Rare Earths Development Section, Bhabha Atomic Research Centre, Mumbai, 400085, India; |
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Abstract: | The extraction of uranium(VI) from nitric acid medium is investigated using 2-ethylhexyl phosphonic acid-mono-2-ethylhexyl
ester (PC88A in dimeric form, H2A2) as extractant either alone or in combination with neutral extractants such as tri-n-butyl phosphate (TBP), trioctyl phosphine oxide (TOPO), and dioctyl sulfoxide (DOSO). The effects of different experimental
parameters such as aqueous phase acidity (up to 10 M HNO3), nature of diluent xylene, carbon tetrachloride (CCl4), n-dodecane and methyl iso-butyl ketone (MIBK)] and of temperature (303–333 K) on the extraction behavior of uranium were investigated. Synergistic
extraction of uranium was observed between 0.5 and 6 M HNO3. Use of MIBK as diluent was also studied. Temperature variation studies using PC88A as extractant showed exothermic nature
of extraction process. Studies were carried out to optimize the conditions for the recovery of uranium from the raffinate
generated during the purification of uranium from nitric acid medium. Inductively Couple Plasma Atomic Emission Spectroscopy
(ICP-AES) and Energy Dispersive X-Ray Fluorescence (EDXRF) techniques were employed for analysis of uranium in equilibrated
samples. |
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