Zirconium/TBP/Solvent extraction /Fuel reprocessing /Degradation
SummaryRetention of zirconium in 30% TBP/nDD as a function of the age of zirconium organic solutions was studied by comparing distribution coefficients obtained from forward extraction and back extraction. The results of extraction studies showed that, although in freshly prepared zirconium organic solution zirconium is present only in scrubbable form, with the passage of time it undergoes conversion to a non-scrubbable form; scrubbing after 15 days of aging leaves ~40% of the zirconium in the organic phase. Zirconium that precipitated from aged organic solutions was identified as zirconium monobutyl phosphate or zirconium dibutyl phosphate.
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