Supercritical fluid extraction of uranium and thorium from nitric acid solutions with organophosphorus reagents

Lin, Yuehe; Smart, Neil G.; Wai, Chien M.

doi:10.1021/es00010a036

Cited by 130 publications

(100 citation statements)

References 8 publications

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“…Recent investigations into the utilisation of supercritical fluid carbon dioxide containing dissolved TBP indicate that effective extraction of actinides can be achieved without an organic phase diluent. 2,3) The efficiencies for the extraction of uranyl and thorium ions with TBP modified supercritical CO 2 were found to be comparable with those observed from the conventional solvent extraction with TBP dissolved in kerosene. 1) Advantages of supercritical fluid extraction include favourable mass transport properties and minimisation of waste solvent generation.…”

Section: Introductionmentioning

confidence: 55%

“…4) A number of studies have demonstrated the extraction of metal ions present in aqueous solutions by supercritical CO 2 , but understanding of the rate of the extraction process is often unknown. 2,[5][6][7][8][9] The feasibility of extracting uranyl ions from nitric acid solutions may have important applications in nuclear waste management. Recently, we have investigated the extraction of uranyl ions from solid and liquid matrices utilising supercritical CO 2 under various conditions.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Modelling of the Extraction of Uranium with Supercritical Carbon Dioxide.

Clifford¹,

Shu²,

Smart³

et al. 2001

J. Nucl. Sci. Technol.

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A model is presented for the analysis of the results of extraction of uranium in a flow system by supercritical fluid modified with tributylphosphate from a nitric acid matrix, in which the extraction is not limited by the solubility of the uranium species. The model used is that of diffusion out of a sphere into a medium in which the extracted uranium is infinitely dilute. Although not a completely accurate representation of the liquid-supercritical fluid system, the model is shown to be a reasonable representation and some conclusions discussed.

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Section: Introductionmentioning

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Modelling of the Extraction of Uranium with Supercritical Carbon Dioxide.

Clifford¹,

Shu²,

Smart³

et al. 2001

J. Nucl. Sci. Technol.

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“…Although the solubility of water in CO 2 is less than 1 mole % (Dohrn et al, 1993) our investigations show that it may have substantial influence on the stability of some metal chelate complexes. In addition, several researchers have found that the addition of a small amount of water can significantly increase the extraction efficiency of metals from solid matrices with supercritical CO 2 (Laintz et al, 1992;Lin et al, 1994;Lin et al, 1995b;Phelps et al, 1996). Thus, understanding the effects of water on metal chelate stability and solubility is vitally important.…”

Section: B Effect Of Water On Metal Chelates In Comentioning

confidence: 99%

Spectroscopy, modeling and computation of metal chelate solubility in supercritical CO{sub 2}. Annual progress report, September 15, 1996--September 14, 1997

Brennecke¹,

Stadtherr²,

Chateauneuf³

1997

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“…Tributylphosphate (TBP) is a key extractant for uranium and plutonium in the PUREX process, and it dissolves well in organic solvents, such as kerosene. According to a recent report, TBP dissolved easily in supercritical carbon dioxide (CO2) [7]. Supercritical CO2 has good qualities as a solvent, combining the high solubility of a liquid with the fast reaction speed of a gas.…”

Section: Introductionmentioning

confidence: 99%

Decontamination of Uranium-Contaminated Soil Sand Using Supercritical CO2 with a TBP–HNO3 Complex

Park

Jung

Park

2015

Metals

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An environmentally friendly decontamination process for uranium-contaminated soil sand is proposed. The process uses supercritical CO2 as the cleaning solvent and a TBP-HNO3 complex as the reagent. Four types of samples (sea sand and coarse, medium, and fine soil sand) were artificially contaminated with uranium. The effects of the amount of the reagent, sand type, and elapsed time after the preparation of the samples on decontamination were examined. The extraction ratios of uranium in all of the four types of sand samples were very high when the time that elapsed after preparation was less than a few days. The extraction ratio of uranium decreased in the soil sand with a higher surface area as the elapsed time increased, indicating the possible formation of chemisorbed uranium on the surface of the samples. The solvent of supercritical CO2 seemed to be very effective in the decontamination of soil sand. However, the extraction of chemisorbed uranium in soil sand may need additional processes, such as the application of mechanical vibration and the addition of bond-breaking reagents.

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Supercritical fluid extraction of uranium and thorium from nitric acid solutions with organophosphorus reagents

Cited by 130 publications

References 8 publications

Modelling of the Extraction of Uranium with Supercritical Carbon Dioxide.

Modelling of the Extraction of Uranium with Supercritical Carbon Dioxide.

Spectroscopy, modeling and computation of metal chelate solubility in supercritical CO{sub 2}. Annual progress report, September 15, 1996--September 14, 1997

Decontamination of Uranium-Contaminated Soil Sand Using Supercritical CO2 with a TBP–HNO3 Complex

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