Abstract
The existing kinetic models often consider the influence of a single factor alone on the chemical reaction and this is insufficient to completely describe the decomposition reaction of solids. Therefore, the existing kinetic models were improved using the pore structure model. The proposed model was verified using the thermal decomposition experiment on calcium carbonate. The equation has been modified as fα=n1−α1−1n−ln1−α−1m1−ψln1−α12. This led to the conclusion that the pore structure, generated during the thermal decomposition of calcite, has an important influence on the decomposition kinetics. The existing experimental data show that the improved model, with random pores as the main body, reasonably describes the thermal decomposition process of calcite.
Highlights
Calcium carbonate is a crystal mineral with a large reserve and wide distribution in nature and has a wide range of applications in metallurgy, chemical industry, construction, and more [1,2,3,4,5,6].The prediction and identification of the thermal decomposition mechanism are important for kinetic studies in order to expand the practical applications of calcium carbonate and its decomposition products [7,8,9,10,11]
The partial pressure of carbon dioxide during the thermal decomposition of calcium carbonate is a minor factor in comparison with the heat conduction and geometry of the sample that was discovered by Calvo et al by changing the experimental conditions of thermal decomposition [18]
The samples of No.2 and No.3 had the same condition expect for the different particle size, which indicated that the particle size of the sample had a great influence on the thermal decomposition mechanism of calcite during the thermal decomposition process, which would lead to the change of kinetic parameters
Summary
Jingxue Zheng 1,2 , Junchen Huang 1,2 , Lin Tao 1,2 , Zhi Li 1,2, * and Qi Wang 1,2, *. The Key Laboratory of Chemical Metallurgy Engineering of Liaoning Province, University of Science and Technology Liaoning, Anshan 114051, China. Received: 17 August 2020; Accepted: September 2020; Published: September 2020
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