Modeling the leaching of aluminophosphate glass in the presence of bentonite

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The article presents a model of aluminophosphate glass leaching, an analogue of the RW glass matrix, in static mode in the presence of bentonite. Parameterization of the model is based on experimental data. The model takes into account the kinetics of the glass matrix leaching and the transformation of bentonite mineral phases; sorption processes are also taken into account, as well as the inhibition of leaching by the precipitation of secondary mineral phases formed. The model demonstrates a small transformation of clay phases, as well as the formation of secondary phosphate phases and gibbsite upon leaching of glass in the contact zone with bentonite. The simulation was carried out in the PhreeqC software.

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Sobre autores

K. Boldyrev

Institute for Safe Development of Nuclear Power Engineering, Russian Academy of Sciences

Autor responsável pela correspondência
Email: kaboldyrev@ibrae.ac.ru
Rússia, ul. B. Tul'skaya., 52, Moscow, 115191

Bibliografia

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  3. Kryuchkov, D.V., Boldyrev, K.A. [Principles ensuring comprehensive accounting of processes associated with engineered safety barriers’ evolution: assessing radionuclide spread beyond site boundaries]. Radioactivnye otkhody, 2019, no. 4 (9), pp. 106–115. https://doi.org/ 10 25283/2587-9707-2019-4-106-115 (in Russian)
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2. Fig. 1. The scheme of formation of an integrated model of the passage of a pollutant through a cascade of evolving security barriers.

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3. Fig. 2. Accounting for ongoing processes in the model.

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4. Fig. 3. Results of comparison of model and experimental data on modeling the transformation of bentonite phases of the 10th Khutor deposit under alkaline conditions.

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5. Fig. 4. Results of comparison of model and experimental data on the leaching of NAP glass. a – for Na and P; b – for Si; c – for Ca, Mg.

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6. Fig. 5. Results of modeling the phase content during leaching: a— phases of bentonite by weight. %; b— the content of secondary phases in the system.

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