Development of a Solvent Extraction Process for Cesium Removal From SRS Tank Waste

Caustic-Side Solvent-Extraction Modeling for Hanford Interim Pretreatment System

“…The process as currently practiced has been optimized [2][3][4][5][6] and demonstrated [7][8][9] for removal of cesium from salt waste at the Savannah River Site (SRS). To meet the needs of the SRS Salt Waste Processing Facility (SWPF) [10], the CSSX process has been designed and demonstrated to remove cesium with a decontamination factor (DF) in excess of 40,000, concentrating it by a factor (CF) of 15 in a stream of 1 mM HNO 3 suitable for vitrification.…”

Design and Synthesis of the Next Generation of Crown Ethers for Waste Separations: An Inter-Laboratory Comprehensive Proposal

“…Our first experiments conducted under funding from the EM-50 Efficient Separations and Processing (ESP) Crosscutting Program (TTP = OR16C341) in 1998 confirmed the high selectivity but revealed that much work would be needed to develop a practical solvent-extraction (SX) technology [7]. With the understanding of extraction equilibria provided under this EMSP research [8], a first-generation cesium solvent extraction technology (alkaline-side CSEX) was successfully developed and tested, again under ESP funding [9][10][11][12]. It was concluded that the alkaline-side CSEX process meets the requirements for the removal of cesium from SRS highlevel waste and is economically competitive with the alternative nonelutable ion-exchange and precipitation technologies [2,13,14].…”

“…However, owing to the relative immaturity of the alkalineside CSEX process coupled with the demanding schedule for implementation, the process was not selected in 1998 to proceed with higher-scale development and testing. Under funding by the ESP Crosscutting Program, however, the major chemical issues of stability and susceptibility to impurity effects w ere successfully dealt with in 1999 [12,15,16]. Again, insight on extraction equilibria gained in this EMSP research proved critical in designing the second-generation solvent system [12,16].…”

“…Under funding by the ESP Crosscutting Program, however, the major chemical issues of stability and susceptibility to impurity effects w ere successfully dealt with in 1999 [12,15,16]. Again, insight on extraction equilibria gained in this EMSP research proved critical in designing the second-generation solvent system [12,16]. Based on the performance data for this second-generation solvent system, a conceptual flowsheet was calculated, meeting the SRS requirements in 22 stages [12,16].…”

“…Again, insight on extraction equilibria gained in this EMSP research proved critical in designing the second-generation solvent system [12,16]. Based on the performance data for this second-generation solvent system, a conceptual flowsheet was calculated, meeting the SRS requirements in 22 stages [12,16]. A vigorous testing program at the SRS, ORNL, and ANL is now under way.…”