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- W1976989607 abstract "The modern worldwide Purex technology (spent nuclear fuel reprocessing) is based on solvent extraction of actinides (U, Pu) in a system with aqueous nitric acid solutions and organic (n-paraffins) solutions of tri-n-butylphosphate (TBP).To the creation of a universal mathematical process model contributes - first of all - the knowledge of uranium(VI), plutonium(IV) and nitric acid equilibrated distribution data. Further should be included the field of all the technological (“know-how”) operations, in particular, so-called strong-and-weak-acid and high-and-ambient-temperature scrubs of the actinide bearing organic phase. To enrich the Purex data base with additional information the new original values of equilibrium distribution coefficients of Pu(IV) (0.06–28 g/l), U(VI) (0.18–150 g/l) and nitric acid (0.01–10.5 mol/l) (in all the cases - equilibrated aqueous phase concentrations) - at reliable organic solution homogeneity (i.e. without “third” phase formation phenomena) were obtained.Those results include data at 25 and 60°C, of 20 and 30 vol% TBP (in n-dodecane). All the analyses of the metal content were performed using original gamma-spectrometric procedure of simultaneous U and Pu determination. Using both obtained data and known results (no less than 700 “systems” type of “U(VI)-Pu(IV)-water-nitric acid-TBP-n-dodecane“) the simple regressive equations (two third-power polynominal series) were developed, which with an accuracy better than ± 8% permit to calculate the distribution of the three mentioned components. The developed equations of the concentration dependence of the distribution coefficients (D) for all the components have the general form: In Dn = ∑i=03∑k=03∑m=03 ∏(ln[U])i(ln[Pu])k(ln[HNO3])m, where i+K+m⩽3; n = Pu, U, HNO3. The high performance models are recommended for development of operating programs - as a modifier of today's Purex performance." @default.
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- W1976989607 date "1995-05-01" @default.
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- W1976989607 title "The Purex thermodynamics of plutonium(IV) and uranium(VI) macroconcentrations coextraction into tri-n butylphosphate: new data and new models" @default.
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- W1976989607 doi "https://doi.org/10.1016/0022-3115(95)00003-8" @default.
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