ACTINIDE PARTITIONING BY HDEHP SOLVENT EXTRACTION. A VERIFICATION OF THE PROCESS SCHEME BY COUNTERCURRENT EXPERIMENTS IN HOT CELLS
Three HAW partitioning processes have been investigated on a laboratory scale at the JRC-Ispra Establishment (CEC). Their purpose was to demonstrate the chemical feasibility of actinide separation from HAW in order to reduce the potential long-term hazard of vitrified HAW. To verify on a larger fully active scale the flow sheets of two of these processes based on liquid liquid extraction, a fruitful collaboration was established between the JRC (Ispra Establishment) and the CEA (CEN - Fontenay-aux-Roses, France). In this framework, and on the basis of indications resulting from the previous laboratory investigations at the JRC, continuous countercurrent experiments with mixer - settler (M-S) batteries were performed in the hot cells of CENFAR laboratories. The present paper deals with the verification of option 1 of the HDEHP process flow sheet and illustrates related experimental results. The objectives to be attained by such an experiment were the following: to verify on a larger hot scale the overall feasibility of the actinide separation from HAW; to test HAW denitration under well controlled process conditions (formic acid reactivity) and to verify actinide behaviour during denitration; to verify the hydraulic behaviour during continuous countercurrent extraction and back-extraction cycle withM- S batteries; to check extraction and back-extraction yields of actinides attainable by M-S experiments.
Bibliographic Reference: INORGANICA CHIMICA ACTA, VOL. 94 (1984), PP. 179-182
Record Number: 1989122072500 / Last updated on: 1987-01-01
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