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Monolith matrix of calcium aluminate and gypsum—promising material for incorporating NaNO3-containing liquid radioactive waste

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Abstract

Possible applications of a new matrix were studied for incorporating radioactive aqueous NaNO3 solutions arising at the nuclear fuel cycle enterprises. The matrix is formed by solidifying the solutions under study with cement consisting of a mixture of industrial calcium aluminate with gypsum. The compressive strength of the matrix was investigated as a function of the cement composition. The positive effect of sodium nitrate on the matrix strength was discussed and explained. As a result of the study, a matrix containing up to 24 wt.% NaNO3 was obtained, meeting all the requirements imposed on the cemented radioactive waste.

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  1. Laboratory for Radioactive Elements Chromatography, Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, Russia

    Oleg A. Kononenko & Evgeny A. Kozlitin

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  1. Oleg A. Kononenko
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  2. Evgeny A. Kozlitin
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Correspondence to Evgeny A. Kozlitin.

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Kononenko, O.A., Kozlitin, E.A. Monolith matrix of calcium aluminate and gypsum—promising material for incorporating NaNO3-containing liquid radioactive waste. J Radioanal Nucl Chem 332, 4065–4073 (2023). https://doi.org/10.1007/s10967-023-09086-x

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