Separation Features of TPE and REE by Complex Displacement Chromatography from Highly Active Solutions Formed after SNF Processing

Radiation loads and compositions of solid phases are calculated during the separation of TPE and REE from solutions generated in the course of SNF reprocessing. Sorption from weakly concentrated solutions under the action of high radiation loads in the upper part of the sorption column leads to the...

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Bibliographic Details
Published in:Radiochemistry (New York, N.Y.) N.Y.), 2022-12, Vol.64 (6), p.721-727
Main Authors: Kharitonov, O. V., Firsova, L. A.
Format: Article
Language:English
Subjects:
Aluminum
Blocking
Chemical precipitation
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Diethylenetriamine pentaacetic acid
Liquid phases
Nuclear Chemistry
Precipitates
Reprocessing
Room temperature
Separation
Solid phases
Sorbents
Sorption
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Summary:Radiation loads and compositions of solid phases are calculated during the separation of TPE and REE from solutions generated in the course of SNF reprocessing. Sorption from weakly concentrated solutions under the action of high radiation loads in the upper part of the sorption column leads to the sorbent decomposition, up to 30% of its original capacity. The hydroxide forms of iron, chromium, aluminum and nickel pass from the solid to the liquid phase and generate gel-like precipitates under the action of high radiation loads, which block the sorption column. During elution, aluminum is washed out in the TPE region and forms a protonated complex with diethylenetriaminepentaacetic acid ( DTPA), which precipitates at room temperature. This precipitate in the unheated connecting lines of the plant can bring about blocking of the separation columns.
ISSN:1066-3622
1608-3288
DOI:10.1134/S106636222206008X