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Liquid-liquid extraction of uranium(VI) in the system with a membrane contactor.

Biełuszka P, Zakrzewska G, Chajduk E, Dudek J - J Radioanal Nucl Chem (2013)

Bottom Line: The project implemented by Institute of Nuclear Chemistry and Technology concerns the development of effective methods for uranium extraction from low-grade ores and phosphorites for production of yellow cake-U3O8.To avoid the membrane wettability by organic solvent and mixing two phases equal pressure drops along the membrane module to minimize the transmembrane pressure, were assumed.The integrated process of extraction/re-extraction conducted in continuous mode with application of two contactors was designed.

View Article: PubMed Central - PubMed

Affiliation: Institute of Nuclear Chemistry and Technology, Dorodna 16, 03-195 Warsaw, Poland.

ABSTRACT

Raising role of the nuclear power industry, including governmental plans for the construction of first nuclear power plant in Poland, creates increasing demand for the uranium-based nuclear fuels. The project implemented by Institute of Nuclear Chemistry and Technology concerns the development of effective methods for uranium extraction from low-grade ores and phosphorites for production of yellow cake-U3O8. The Liqui-Cel(®) Extra-Flow 2.5 × 8 Membrane Contactor produced by CELGARD LLC (Charlotte, NC) company is the main component of the installation for liquid-liquid extraction applied for processing of post leaching liquors. In the process of membrane extraction the uranyl ions from aqueous phase are transported through the membrane into organic phase. The flow of two phases in the system was arranged in co-current mode. The very important element of the work was a selection of extracting agents appropriate for the membrane process. After preliminary experiments comprising tests of membrane resistivity and determination of extraction efficiency, di(2-ethylhexyl)phosphoric acid was found to be most favourable. An important aspect of the work was the adjustment of hydrodynamic conditions in the capillary module. To avoid the membrane wettability by organic solvent and mixing two phases equal pressure drops along the membrane module to minimize the transmembrane pressure, were assumed. Determination of pressure drop along the module was conducted using Bernoulli equation. The integrated process of extraction/re-extraction conducted in continuous mode with application of two contactors was designed.

No MeSH data available.


Related in: MedlinePlus

Extraction efficiency of uranium from model solutions of uranyl nitrate (UO2(NO3)2·6H2O) in 5 % H2SO4
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Related In: Results  -  Collection


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Fig3: Extraction efficiency of uranium from model solutions of uranyl nitrate (UO2(NO3)2·6H2O) in 5 % H2SO4

Mentions: A very important part of the work was a selection of uranium extracting agents appropriate for the membrane process. In the laboratory experiments the partition coefficients for uranium extraction by different extractants, like e.g.: tributylphosphate (TBP), triethylamine (TEA), di(2-ethylhexyl)phosphoric acid (D2EHPA), tri-n-octylamine (TnOA) and trioctylphosphine oxide were determined. TnOA and D2EHPA were found to be most favourable extractants for uranium in this study; TBP and TEA in the environment of 5 % H2SO4 were found the weakest extracting agents tested. The classification of the extractants was showed below (see Fig. 3).Fig. 3


Liquid-liquid extraction of uranium(VI) in the system with a membrane contactor.

Biełuszka P, Zakrzewska G, Chajduk E, Dudek J - J Radioanal Nucl Chem (2013)

Extraction efficiency of uranium from model solutions of uranyl nitrate (UO2(NO3)2·6H2O) in 5 % H2SO4
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4514684&req=5

Fig3: Extraction efficiency of uranium from model solutions of uranyl nitrate (UO2(NO3)2·6H2O) in 5 % H2SO4
Mentions: A very important part of the work was a selection of uranium extracting agents appropriate for the membrane process. In the laboratory experiments the partition coefficients for uranium extraction by different extractants, like e.g.: tributylphosphate (TBP), triethylamine (TEA), di(2-ethylhexyl)phosphoric acid (D2EHPA), tri-n-octylamine (TnOA) and trioctylphosphine oxide were determined. TnOA and D2EHPA were found to be most favourable extractants for uranium in this study; TBP and TEA in the environment of 5 % H2SO4 were found the weakest extracting agents tested. The classification of the extractants was showed below (see Fig. 3).Fig. 3

Bottom Line: The project implemented by Institute of Nuclear Chemistry and Technology concerns the development of effective methods for uranium extraction from low-grade ores and phosphorites for production of yellow cake-U3O8.To avoid the membrane wettability by organic solvent and mixing two phases equal pressure drops along the membrane module to minimize the transmembrane pressure, were assumed.The integrated process of extraction/re-extraction conducted in continuous mode with application of two contactors was designed.

View Article: PubMed Central - PubMed

Affiliation: Institute of Nuclear Chemistry and Technology, Dorodna 16, 03-195 Warsaw, Poland.

ABSTRACT

Raising role of the nuclear power industry, including governmental plans for the construction of first nuclear power plant in Poland, creates increasing demand for the uranium-based nuclear fuels. The project implemented by Institute of Nuclear Chemistry and Technology concerns the development of effective methods for uranium extraction from low-grade ores and phosphorites for production of yellow cake-U3O8. The Liqui-Cel(®) Extra-Flow 2.5 × 8 Membrane Contactor produced by CELGARD LLC (Charlotte, NC) company is the main component of the installation for liquid-liquid extraction applied for processing of post leaching liquors. In the process of membrane extraction the uranyl ions from aqueous phase are transported through the membrane into organic phase. The flow of two phases in the system was arranged in co-current mode. The very important element of the work was a selection of extracting agents appropriate for the membrane process. After preliminary experiments comprising tests of membrane resistivity and determination of extraction efficiency, di(2-ethylhexyl)phosphoric acid was found to be most favourable. An important aspect of the work was the adjustment of hydrodynamic conditions in the capillary module. To avoid the membrane wettability by organic solvent and mixing two phases equal pressure drops along the membrane module to minimize the transmembrane pressure, were assumed. Determination of pressure drop along the module was conducted using Bernoulli equation. The integrated process of extraction/re-extraction conducted in continuous mode with application of two contactors was designed.

No MeSH data available.


Related in: MedlinePlus