TY - JOUR

T1 - Development of a regenerable strip reagent for treatment of acidic, radioactive waste with cobalt dicarbollide-based solvent extraction processes

AU - Law, Jack D.

AU - Herbst, R. Scott

AU - Peterman, Dean R.

AU - Todd, Terry A.

AU - Romanovskiy, Valeriy N.

AU - Babain, Vasily A.

AU - Smirnov, Igor V.

PY - 2005/1/1

Y1 - 2005/1/1

N2 - A regenerable methylamine carbonate (MAC)/diethylenetriamine pentaacetic acid (DTPA) strip solution has been developed, as a collaborative effort between the Khlopin Radium Institute (KRI) and the Idaho National Engineering and Environmental Laboratory (INEEL), for the stripping of actinides, lanthanides, Cs, and Sr from cobalt dicarbollide-based solvent extraction processes. Methodology and experimental results of developing this strip reagent and a distillation method for regeneration of the resulting strip solution are presented. Additionally, countercurrent flowsheet testing of the Universal Solvent Extraction (UNEX) process, using 26 stages of 3.3 cm diameter centrifugal contactors, has been performed at the INEEL using dissolved pilot plant calcine and this regenerable strip solution. Results of stripping Cs, Sr, actinides, and lanthanides from the UNEX solvent with a MAC + DTPA strip solution that was freshly prepared and that has been regenerated are presented. Overall results of the flowsheet test are also presented.

AB - A regenerable methylamine carbonate (MAC)/diethylenetriamine pentaacetic acid (DTPA) strip solution has been developed, as a collaborative effort between the Khlopin Radium Institute (KRI) and the Idaho National Engineering and Environmental Laboratory (INEEL), for the stripping of actinides, lanthanides, Cs, and Sr from cobalt dicarbollide-based solvent extraction processes. Methodology and experimental results of developing this strip reagent and a distillation method for regeneration of the resulting strip solution are presented. Additionally, countercurrent flowsheet testing of the Universal Solvent Extraction (UNEX) process, using 26 stages of 3.3 cm diameter centrifugal contactors, has been performed at the INEEL using dissolved pilot plant calcine and this regenerable strip solution. Results of stripping Cs, Sr, actinides, and lanthanides from the UNEX solvent with a MAC + DTPA strip solution that was freshly prepared and that has been regenerated are presented. Overall results of the flowsheet test are also presented.

KW - Actinide extraction

KW - Chlorinated cobalt dicarbollide

KW - Cs extraction

KW - Methylamine carbonate

KW - PEG-400

KW - Sr extraction

KW - UNEX process

UR - http://www.scopus.com/inward/record.url?scp=13644277707&partnerID=8YFLogxK

U2 - 10.1081/SEI-200044377

DO - 10.1081/SEI-200044377

M3 - Article

AN - SCOPUS:13644277707

VL - 23

SP - 59

EP - 83

JO - Solvent Extraction and Ion Exchange

JF - Solvent Extraction and Ion Exchange

SN - 0736-6299

IS - 1

ER -