Authors:
V. GopalakrishnanBhabha Atomic Research Centre Fuel Reprocessing Division Trombay 400 085 Bombay (India)

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P. DhamiBhabha Atomic Research Centre Fuel Reprocessing Division Trombay 400 085 Bombay (India)

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A. RamanujamBhabha Atomic Research Centre Fuel Reprocessing Division Trombay 400 085 Bombay (India)

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M. KrishnaBhabha Atomic Research Centre Radiochemistry Division Trombay 400 085 Bombay (India)

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M. MuraliBhabha Atomic Research Centre Radiochemistry Division Trombay 400 085 Bombay (India)

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J. MathurBhabha Atomic Research Centre Radiochemistry Division Trombay 400 085 Bombay (India)

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R. IyerBhabha Atomic Research Centre Radiochemistry Division Trombay 400 085 Bombay (India)

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A. BauriBhabha Atomic Research Centre Bio-Organic Division Trombay 400 085 Bombay (India)

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A. BanerjiBhabha Atomic Research Centre Bio-Organic Division Trombay 400 085 Bombay (India)

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Abstract  

Bench-Scale studies on the partitioning and recovery of minoractinides from the actual and synthetic sulphate-bearing high level waste (SBHLW) solutions have been carried out by giving two contacts with 30% TBP to deplete uranium content followed by four contacts with 0.2M CMPO+1.2M TBP in dodecane. The acidity of the SBHLW solutions was about 0.3M. In the case of actual SBHLW, the final raffinate contained about 0.4% -activity originally present in the HLW, whereas with synthetic SBHLW the -activity was reduced to the background level.144Ce is extracted almost quantitative in the CMPO phase,106Ru about 12% and137Cs is practically not extracted at all. The extraction chromatographic column studies with synthetic SBHLW (aftertwo TBP contacts) has shown that large volume of waste solutions could be passed through the column without break-through of actinide metal ions. Using 0.04M HNO3>99% Am(III) and rare earths could be eluted/stripped. Similarly >99% Pu(IV) and U(VI) could be eluted.stripped using 0.01M oxalic acid and 0.25M sodium carbonate, respectively. In the presence of 0.16M SO 42– (in the SBHLW) the complex ions AmSO 4+ , UO2SO4, PuSO 42+ and Pu(SO4)2 were formed in the aqueous phase but the species extracted into the organic phase (CMPO+TBP) were only the nitrato complexes Am(NO3)3·3CMPO, UO2(NO3)2·2CMPO and Pu(NO3)4·2CMPO. A scheme for the recovery of minor actinides from SBHLW solution with two contacts of 30% TBP followed by either solvent extraction or extraction chromatographic techniques has been proposed.

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Journal of Radionalytical and Nuclear Chemistry
Language English
Size A4
Year of
Foundation
1968
Volumes
per Year
1
Issues
per Year
12
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5731 (Print)
ISSN 1588-2780 (Online)