Exponential modeling of Al₂O₃ reduction during activation of Navbahor alkaline-earth bentonite
Abstract
In this study, using mathematical modeling, the change in Al2O3 content as a function of acid concentration during hydrochloric acid activation of alkaline-earth bentonite from the Navbahor deposit is investigated. During the experiment, the HCl concentration varied from 5% to 20%, and the change in Al2O3 content was nonlinear. To describe the experimental data obtained during hydrochloric acid activation of alkaline-earth bentonite from the Navbahor deposit, an exponential decay model was proposed, and its parameters were estimated by regression analysis. The accuracy of this approach is supported by the coefficient of determination (R² = 0.964) and the root mean square error (RMSE = 0.231%), indicating high accuracy and stability. The results obtained show that the decrease in Al₂O₃ content under acid activation conditions exhibits a nonlinear dependence on hydrochloric acid concentration rather than on time, and they enable formulation of a mathematical expression for the quantitative description of the process and for evaluating the effect of concentration.