Recovery of minor actinides from HLLW using the DIAMEX process
-
Daniel Serrano-Purroy
Summary
In this work a hot demonstration of the DIAMEX process using the new reference molecule DMDOHEMA (N,N′-DiMethyl-N,N′-DiOctylHexylEthoxyMalonAmide) and genuine high-level PUREX raffinate as feed is reported. The continuous counter-current experiment was carried out in a 16-stage centrifugal extractor battery, installed in a hot cell. In order to produce a representative High Level Liquid Waste (HLLW) a PUREX process was applied on dissolved fuel using the same equipment. It was demonstrated that 5 extraction stages were sufficient to achieve feed decontamination factors above 2200 and 320 for Am and Cm, respectively. Co-extraction of molybdenum and zirconium, as well as of palladium, were efficiently prevented using oxalic acid and HEDTA scrubbing, respectively. However, technetium, yttrium, and to some extent ruthenium, were co-extracted. The back-extraction proved to be very efficient, yielding in 4 stages more than 99.9% recovery of Am and Cm. The extraction profiles were modeled with computer code simulations and the results compared with data obtained from an experiment using the former reference molecule DMDBTDMA (DiMethylDiButylTetraDecylMalonAmide).
© by Oldenbourg Wissenschaftsverlag, München
Artikel in diesem Heft
- Activation cross sections for reactions induced by 14 MeV neutrons on natural tin and enriched 112Sn targets with reference to 111In production via radioisotope generator 112Sn(n, 2n)111Sn → 111In
- Study on some physical chemistry aspects of extraction of uranium(VI) with bis(octylsulfinyl)methane
- Adsorption modeling and thermodynamic characteristics of uranium(VI) ions onto 1-(2-pyridylazo)-2-naphthol (PAN) supported polyurethane foam
- Sorption of trivalent plutonium onto UO2 and the effect of the solid phase on the Pu oxidation state
- Solubility of uranium(IV) hydrous oxide in high pH solution under reducing condition
- Recovery of minor actinides from HLLW using the DIAMEX process
- Towards a DIAMEX process using high active concentrate. Production of genuine solutions
- The mobility of anthropogenic 129I in a shallow sand aquifer at Sturgeon Falls, Ontario, Canada
Artikel in diesem Heft
- Activation cross sections for reactions induced by 14 MeV neutrons on natural tin and enriched 112Sn targets with reference to 111In production via radioisotope generator 112Sn(n, 2n)111Sn → 111In
- Study on some physical chemistry aspects of extraction of uranium(VI) with bis(octylsulfinyl)methane
- Adsorption modeling and thermodynamic characteristics of uranium(VI) ions onto 1-(2-pyridylazo)-2-naphthol (PAN) supported polyurethane foam
- Sorption of trivalent plutonium onto UO2 and the effect of the solid phase on the Pu oxidation state
- Solubility of uranium(IV) hydrous oxide in high pH solution under reducing condition
- Recovery of minor actinides from HLLW using the DIAMEX process
- Towards a DIAMEX process using high active concentrate. Production of genuine solutions
- The mobility of anthropogenic 129I in a shallow sand aquifer at Sturgeon Falls, Ontario, Canada
