| Autor: |
Ordoñez S; Industrial Electromechanics Area, Technological University of Tulancingo, Tulancingo 43642, Mexico., Reyes IA; Institute of Metallurgy, Autonomous University of San Luis Potosí, San Luis Potosí 78210, Mexico.; CONAHCYT, National Council of Humanities, Sciences and Technologies, Mexico City 03940, Mexico., Patiño F; Energy Engineering, Metropolitan Polytechnic University of Hidalgo, Tolcayuca 43860, Mexico., Islas H; Energy Engineering, Metropolitan Polytechnic University of Hidalgo, Tolcayuca 43860, Mexico., Reyes M; Academic Area of Earth Sciences and Materials, Autonomous University of Hidalgo State, Mineral de la Reforma 42183, Mexico., Pérez M; Academic Area of Earth Sciences and Materials, Autonomous University of Hidalgo State, Mineral de la Reforma 42183, Mexico., Juárez JC; Academic Area of Earth Sciences and Materials, Autonomous University of Hidalgo State, Mineral de la Reforma 42183, Mexico., Flores MU; Industrial Electromechanics Area, Technological University of Tulancingo, Tulancingo 43642, Mexico.; Higher School of Chemical Engineering and Extractive Industries, National Polytechnic Institute, Gustavo A. Madero, Mexico City 07738, Mexico. |
| Abstrakt: |
In this work, a kinetic study and modeling of the decomposition of a rock sample in an ascorbic acid medium with a high content of lepidolite phase were carried out, the results of which are of great importance due to the sample's high lithium (Li) content. The rock sample was characterized by X-ray diffraction (XRD), inductively coupled plasma atomic emission spectroscopy (ICP-AES) and X-ray photoelectron spectroscopy (XPS), and the mineral species detected in the sample were lepidolite, at 65.3%, quartz, at 30.6%, and muscovite, at 4.1%, with a quantitative chemical analysis indicating the presence of elements such as Li, Si, K, Na, O, Al and, to a lesser extent, Fe and Ti; this highlights that the Li content present in the sample was 3.38%. Lithium was the element with which the chemical analysis of the kinetics was performed, resulting in decomposition curves comprising the induction period, progressive conversion and stabilization; this highlighted that the reaction progressed during the first two periods, obtaining a reaction order ( n ) of 0.4307 for the induction period and an activation energy ( Ea ) of 48.58 kJ mol -1 , followed by a progressive conversion period with n = 0.309 and Ea = 25.161 kJ mol -1 . This suggested a mixed control regime present in the lower temperature ranges, with a transition from chemical control to transport control present at high temperatures, with the study of the nature of the reaction and the concentration effect showing that chemical control predominates. The kinetic parameters and kinetic expressions for both periods were obtained, with the modeling showing that the calculated and experimental data do not present a major discrepancy. |
