Kinetic Parameters of Mineral Dissolution and Gibbs Free Energy
Ryskaliyeva A. Baltabayev M. Mukhamediyar Y. Zhubatova A. Khokhanbayeva N.
18 December 2025Slovensko Kemijsko Drustvo
Acta Chimica Slovenica
2025#72Issue 4774 - 780 pp.
This study investigates the quantitative relationship between the kinetics and thermodynamics of mineral dissolution in heterogeneous reactions, specifically focusing on the dissolution of sparingly soluble minerals. Building on historical developments in chemical kinetics and thermodynamics, we propose empirical equations that describe experimental data and enable predictive modeling of dissolution processes. Two descriptors were evaluated: the normalized Gibbs energy of oxidation (ΔrG⁰/σ) and the average atomic Gibbs energy of mineral formation (ΔfG⁰/n). Experimental values of the apparent rate constant (k) and specific dissolution rate (W) were obtained under strictly controlled conditions. Linear regression models were developed. The regression coefficients were interpreted in terms of reagent selectivity and aggressiveness, consistent with the Bell–Evans–Polanyi principle. These findings support the use of ΔfG⁰/n as a reliable predictor of mineral reactivity and provide a thermodynamic basis for rational selection of leaching agents.
aggressiveness , chemical reactivity , empirical modeling , heterogeneous reactions , Mineral dissolution , selectivity
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Kazakh National Agrarian Research University, Department of Horticulture, Plant Protection and Quarantine, 8 Abay Ave, Almaty, 050010, Kazakhstan
Higher School of Economics, International College of Economics and Finance, 11 Pokrovsky Bulvar, building T, Moscow, 109028, Russian Federation
Kazakh National Agrarian Research University, Department of Soil Science, Agrochemistry and Ecology, 8 Abay Ave, Almaty, 050010, Kazakhstan
Kazakh National Agrarian Research University
Higher School of Economics
Kazakh National Agrarian Research University
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