Abstract

Butyl lauryl phosphoric acid (HBLP) was chosen as a model compound of secondary degradation products of Purex process solvent. The extent of zirconium complexation by this compound is similar to that of dibutyl phosphoric acid or bis(2 ethyl hexyl) phosphoric acid. The mechanism of zirconium extraction by HBLP was studied. The nature of the extracted species could not be unambiguously established. Tributyl phosphate has an antagonistic effect on the zirconium extraction by HBLP. Removal of HBLP from the solvent cannot be accomplished by alkaline washes representative of solvent clean-up procedures used in the Purex process. This could lead to a long term build-up of this type of compound under Purex processing conditions. The threshold HBLP concentration for an enhancement of zirconium extraction is 2 × 10 −4 M.

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