Title: DIAMEX Counter-Current Extraction Process for Recovery of Trivalent Actinides from Simulated High Active Concentrate
Authors: MODOLO G.VIJGEN H.SERRANO PURROY DANIELCHRISTIANSEN BIRGITMALMBECK RIKARDSOREL C.BARON P.
Citation: SEPARATION SCIENCE AND TECHNOLOGY vol. 42 p. 439-452
Publisher: TAYLOR & FRANCIS INC
Publication Year: 2007
JRC Publication N°: JRC41098
ISSN: 0149-6395
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC41098
Type: Articles in Journals
Abstract: The partitioning of trivalent actinides was demonstrated with a new version of the French DIAMEX (DIAMide EXtraction) process. A continuous counter-current experiment using a 16-stage centrifugal extractor battery was tested using 1 mol/L N,N0-dimethyl-N,N0-dioctyl-hexylethoxy-malonamide (DMDOHEMA) in TPH as the extractant. A high active concentrate (HAC), obtained after concentration and denitration of a high active raffinate (HAR) with a concentration factor of 10, was used as a feed. Based on results from cold and hot batch extraction experiments and computer code calculations, a flowsheet was developed and a full test was carried out using a simulated HAC solution spiked with radionuclides (241Am, 244Cm, 152Eu, and 134Cs). In the DIAMEX process, five extraction stages were sufficient to obtain Am and Cm (feed/raffinate) greater than 5000 and for the coextracted lanthanides decontamination factors between 1100 and 4500. Co-extraction of zirconium, molybdenum, and palladium was prevented by using oxalic acid and HEDTA. The back extraction comprising 4 stages was also efficient and the recoveries of actinides were greater
JRC Institute:Institute for Transuranium Elements

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