Kinetics of thermal decomposition of Hekimhan–Deveci siderite ore samples

Abstract

Different solid-state reaction models, by interpretation of the model graphs in terms of goodness of fit to real data points ( R-squared), are used to evaluate the reaction mechanism and the kinetics ( E, n) for the thermal decomposition of Hekimhan–Deveci siderite ore samples. Isothermal experiments at three different temperatures ( T = 505 °C, 520 °C, 535 °C) are run for t = 15–150 minutes while non-isothermal experiments are conducted at single heating rate (10 °C/min) using thermogravimetric analysis (TGA). Three-dimensional diffusion reaction models have been noted as the solid-state reaction model representing thermal decomposition kinetics of Hekimhan–Deveci siderite. The values of activation energy ( E), the optimum kinetics obtained, are E = 85.53 kj/mol (Jander three-dimensional diffusion reaction model); E = 85.49 kj/mol, (Ginstling–Brounshtein three-dimensional diffusion reaction model).