Actinide Partitioning Flowsheets

Tedder, D. D.; Finney, B.C.; Blomeke, J.O.

doi:10.1021/bk-1980-0117.ch027

Cited by 2 publications

(2 citation statements)

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“…The flow sheet for processing Na 2 C03 scrub solutions (the ARALEX process) is based on the use of 2-EHOH to extract TBP degradation products, primarily DBP and MBP, leaving the actinides in the aqueous phase raffinate. The raffinate can then be recycled into the HLLW and processed using DHDECMP (3 actinide and fission product composition of the organic extractants during stripping operations, and the relative flow rate of extractant and Na2CÛ3 scrub streams. Therefore, certain assumptions were made in selecting a reasonable composition and volume of the Na2CU3 waste to use in developing a flowsheet.…”

Section: Resultsmentioning

confidence: 99%

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The Extraction of DBP and MBP from Actinides: Application to the Recovery of Actinides from TBP-Sodium Carbonate Scrub Solution

Horwitz

Mason

Bloomquist

et al. 1980

ACS Symposium Series

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Significantamounts of actinides are present in nuclear wastes other than high-level liquid waste produced in spent nuclear fuel reprocessing(1). One such waste stream is produced by scrubbing the radiolytic and hydrolytic degradation products from extractant solutions with Na 2 CO 3 . Actinide concentrations in the range of 0.5 to 5 Kg of actinides may be present in the Na 2 CO 3 scrub solutions used to "clean-up" TBP-nDD solutions from the reprocessing of one metric ton of spent nuclear fuel (1,2). In addition, Na 2 CO 3 scrub waste will be generated in the clean-up of the dihexyl-N,N-diethyl carbamoylmethylene phosphonate (DHDECMP) extractant which is to be used to extract all of the actinides from high-level liquid waste (HLLW) in the proposed waste treatment facility described by Tedder, Finney, and Blomeke(3). Na 2 CO 3 scrub solutions from TBP-nDD consist essentially of a NaHCO 3 -NaNO 3 solution containing varying amounts of the sodium salts of dibutylphosphoric and monobutyl phosphoric acids (HDBP and H 2 MBP, respectively) and carbonato-and hydroxo-complexes of the tetra-and hexavalent actinides and zirconium. The actual quantities of DBP, MBP, and actinides depend on the extent of hydrolysis and radiolysis. Analogous waste from DHDECMP-DIPB processing would be similar in composition but would contain mono-and diacidic salts of phosphonic acids and degradation products of DHDECMP (4).The efficient removal of actinides from the Na2CU3 scrub waste solution presents several problems.Acidification of the carbonate solution with excess HNO3 followed by extraction with TBP (or, preferably, DHDECMP) (3) results in the rapid build-up of acidic degradation products (HDBP and H2MBP in the case of TBP) which prevent efficient back extraction.In addition, acidification of Na2C03 scrub waste results in the precipitation of actinide-DBP and -MBP complexes which are difficult to dissolve 1 Work performed under the auspices of the Office of Basic Energy Sciences and the Office of Nuclear Waste Management of the U.S.

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Section: Resultsmentioning

confidence: 99%

“…32 P-labeled phosphoric acid (H3POO, Slabeled dodecyl sulfuric acid (DSA). 3 H-labeled diethylenetriaminepentacetic acid (H5DTPA), and Η-labeled 2-ethyl-l-hexanol (2-EHOH) were obtained from the Amersham Corporation, Arlington Heights, Illinois.…”

Section: Methodsmentioning

confidence: 99%