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- W2003642238 abstract "Reactions between CaO and SiO2, representing the principal components of cement, and schoepite, UO3·2H2O, have been studied in aqueous suspensions at 85°C to evaluate the solubility of uranium at high pH, which is a principal control of the immobilisation potential. Supplementary experiments with preformed Cz.sbnd;Sz.sbnd;H (calcium silicate hydrogel) are also reported. U loadings are in the range 10–80 mol%. Study of the reaction products of 46 compositions has led to the identification of phase compatibility regions. Several solubility-limiting but hitherto uncharacterised CaOz.sbnd;UO3z.sbnd;SiO2z.sbnd;H2O phases are described; their X-ray powder diffraction data are given. The synthetic phases are compared with natural analogues and it is concluded that similarities exist: weeksite- and becquerelite-like structures are probably developed in the synthetics. With formation of crystalline phases, U solubilities decline to 108-10−9 mol/l. Solubilities correlate well with the observed compatibility regions, with lowest solubilities obtained among the uranium-containing phases which are also compatible with Cz.sbnd;Sz.sbnd;H gel. Some slight U sorption into the gel may occur and is postulated to inhibit its crystallisation at 55–85°C. The solubility values are, in general, less than in previous studies which, by omitting SiO2 from simulants and using relatively brief reaction times, fail to achieve the characteristic immobilisation potential." @default.
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- W2003642238 date "1995-01-01" @default.
- W2003642238 modified "2023-09-24" @default.
- W2003642238 title "Reactions between cement components and U(VI) oxide" @default.
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- W2003642238 doi "https://doi.org/10.1016/0956-053x(95)00022-r" @default.
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