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|Title:||Demonstration of a TODGA-Based Continuous Counter-Current Extraction Process for the Partitioning of Actinides from a Simulated PUREX Raffinate, Part II: Centrifugal Contactor Runs|
|Authors:||MODOLO G.; ASP H.; VIJGEN H.; MALMBECK RIKARD; MAGNUSSON Daniel; SOREL C.|
|Citation:||SOLVENT EXTRACTION AND ION EXCHANGE vol. 26 no. 1 p. 62-76|
|Publisher:||TAYLOR & FRANCIS INC|
|Type:||Articles in periodicals and books|
|Abstract:||The efficiency of the partitioning of trivalent actinides from a PUREX raffinate is demonstrated with a TODGA+TBP extractant mixture dissolved in an industrial aliphatic solvent TPH. Based on the results of cold and hot batch extraction studies and with the aid of computer code calculations, a continuous counter-current process is developed and two flowsheets are tested using miniature centrifugal contactors. The feed solution used is a synthetic PUREX raffinate, spiked with 241Am, 244Cm, 252Cf, 152Eu, and 134Cs. More than 99.9% of the trivalent actinides and lanthanides are extracted and back-extracted and very high decontamination factors are obtained for most fission products. The co-extraction of zirconium, molybdenum, and palladium is prevented using oxalic acid and HEDTA. However, 10% of ruthenium is extracted and only 3% is back-extracted using diluted nitric acid. The experimental steady-state concentration profiles of important solutes are determined and compared with model calculations and good agreement is generally obtained.|
|JRC Directorate:||Nuclear Safety and Security|
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