AKUFVE STUDIES ON EXTRACTION BEHAVIOUR OF NEPTUNIUM FROM SIMULATED HLW SOLUTIONS BY 30% TBP

ABSTRACT

The extraction behaviour of neptunium from 3 M nitric acid as well as simulated pressurised heavy water reactor high level radioactive waste (PHWR-HLW) solution by 30% TBP/dodecane was studied using AKUFVE. Np(IV)/Np(V) was oxidised to Np(VI) using oxidising agents, such as K₂Cr₂O₇, VO₂ ⁺ and NaNO₂. Stripping of neptunium from the loaded TBP phase was studied using reducing agents like hydrogen peroxide, ascorbic acid, hydroxyl-amine hydrochloride and hydrazine sulphate. Results of these extraction and stripping studies have been discussed in this paper.

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J.N. Mathur

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