Modeling the leaching of aluminophosphate glass in the presence of bentonite

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.