Uranium(VI) extraction by TBP in the presence of HDBP

Journal Article · Mon Mar 01 04:00:00 EST 1999 · Solvent Extraction and Ion Exchange

DOI:https://doi.org/10.1080/07366299908934611· OSTI ID:343788

Fedorov, Yu S; Zilberman, B Ya; Kulikov, S M; Blazheva, I V; Mishin, E N ^[1]; Wallwork, A L; Denniss, I S; May, I ^[2]; Hill, N J ^[3]

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1. V.G. Khlopin Radium Inst., Saint-Petersburg (Russian Federation)
2. British Nuclear Fuels plc, Sellafield (United Kingdom)
3. British Nuclear Fuels plc, Risley (United Kingdom)

The influence of di-n-butyl phosphoric acid (HDBP) upon extraction of uranium(VI) by tri-n-butyl phosphate (TBP) from 0.5--3.0 M nitric acid solutions has been studied. It has been shown that the uranium(VI) distribution coefficient D{sub U} for extraction by 1.1 M TBP in tri-decane or xylene is increased when HDBP is present in the organic phase. For iso-molar solutions of (TBP + HDBP) with a total concentration of 0.36 M, and Uranium(VI) aqueous concentration up to 10--20 g/l, a maximum value of D{sub U} is observed when TBP/HDBP = 1; for higher U(VI) concentration the maximum gradually disappears, with D{sub U} growing monotonically with the HDBP content in the organic phase. Uranium(VI) absorption spectra for 1.1 M TBP in tri-decane or xylene, containing HDBP, provide evidence for the formation of compounds, of which composition is intermediate between uranyl nitrate--TBP disolvate and the U(VI)--HDBP complex. It is proposed that these intermediate compounds are UO{sub 2}(NO{sub 3}){sub 2}HDBP.TBP and UO{sub 2}(NO{sub 3}){sub 2}(HDBP){sub 2}.

• Sponsoring Organization: USDOE
• OSTI ID: 343788
• Journal Information: Solvent Extraction and Ion Exchange, Journal Name: Solvent Extraction and Ion Exchange Journal Issue: 2 Vol. 17; ISSN 0736-6299; ISSN SEIEDB
• Country of Publication: United States
• Language: English

Related Subjects

05 NUCLEAR FUELS
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
ABSORPTION SPECTRA
ORGANIC PHOSPHORUS COMPOUNDS
REACTION INTERMEDIATES
REPROCESSING
SOLVENT EXTRACTION
SPENT FUELS
TBP
URANIUM