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Gibbsite- and kuzelite-based matrix for the preservation of radioactive aqueous sodium nitrate concentrates

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Abstract

The article studies the possibility of using a matrix of gibbsite and kuzelite for the preservation of liquid radioactive wastes consisting of aqueous NaNO3 concentrates. The matrix is formed during the solidification of these wastes with cement, consisting of calcium aluminate and gypsum. The requirements for cemented solid waste are met by a matrix obtained from a mixture of the following composition: 45.2%-NaNO3 solution 53.04%; gypsum—5.4%; calcium aluminate—36.16%; diatomite powder treated with polydiallyldimethylammonium chloride (polyDADMAC)—5.4%. The matrix has the following characteristics: ratio of matrix and cemented solution volumes—1.45; average 137Cs leaching rate for 90 days—1.4∙10−4 g/(cm2∙day); strength—15.2 MPa, including after the tests for water resistance, 30 freezing-thawing cycles, and irradiation to a dose of 1 MGy—6.8, 15.4, and 9.6 MPa, respectively.

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Authors and Affiliations

  1. Frumkin Institute of Physical Chemistry and Electrochemistry, Moscow, Russian Federation

    O. A. Kononenko & V. I. Makarenkov

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  1. O. A. Kononenko
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  2. V. I. Makarenkov
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Correspondence to O. A. Kononenko.

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Translated from Atomnaya Energiya, Vol. 134, No. 5–6, pp. 238–245, May–June, 2023.

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Original article submitted September 20, 2022.

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Kononenko, O.A., Makarenkov, V.I. Gibbsite- and kuzelite-based matrix for the preservation of radioactive aqueous sodium nitrate concentrates. At Energy (2024). https://doi.org/10.1007/s10512-024-01061-3

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  • DOI: https://doi.org/10.1007/s10512-024-01061-3

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