Partitioning of minor actinides from HLLW using the DIAMEX process. Part 1 - Demonstration of extraction performances and hydraulic behaviour of the solvent in a continuous process
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O. Courson
The French DIAMEX process shows very promising capabilities in separating minor actinides from HLLW. A counter-current centrifugal extractor experiment has been conducted to investigate the capabilities and possibilities of the DIAMEX process (hydraulic and extraction behaviour), for the separation of lanthanides from a simulated High Level Liquid Waste (HLLW), corresponding in concentration to a raffinate from the PUREX process.
A ´´hot´´ batch test, using genuine HLLW, and a continuous counter-current experiment have verified the excellent extraction and hydraulic behaviour, respectively.
With only four extraction stages in the cold experiment, lanthanide decontamination factors were higher than 2000, except for europium. Co-extraction of molybdenum and zirconium was efficiently prevented using oxalic acid in the feed solution. The back-extraction was very efficient, yielding in 4 stages more than 99% recovery of lanthanides. Palladium and ruthenium were more difficult to back-extract and for these elements further investigations are needed.
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Artikel in diesem Heft
- Cross sections for the formation of long-lived radionuclides 10Be, 26Al and 36Cl in 14.6 MeV neutron induced reactions determined via accelerator mass spectrometry (AMS)
- The ionic radii of Rf4+, Db5+ and Sg6+
- On-line gas chromatographic studies of Rf, Zr, and Hf bromides
- Effects of pH and uranium concentration on the removal of uranium from drinking water by ion exchange
- Complexation of thorium(IV) with desmethyldesferrithiocin
- Partitioning of minor actinides from HLLW using the DIAMEX process. Part 1 - Demonstration of extraction performances and hydraulic behaviour of the solvent in a continuous process
- Partitioning of minor actinides from HLLW using the DIAMEX process. Part 2 - ´´Hot´´ continuous counter-current experiment
- On-line gas-phase separation of short-lived bromine nuclides from precursor selenium
- Simulation of zeolite fixed bed columns used for treatment of liquid radioactive wastes
- Thermodynamics of strontium extraction using substituted crown ethers in mixtures of aliphatic alcohols
