SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2025, Vol. 87 ›› Issue (11): 197-203.DOI: 10.1016/j.cjche.2025.07.014

• • 上一篇    下一篇

Thermal decomposition behavior and kinetics of magnesite under carbon dioxide atmosphere

Ze Gong1, Dexi Wang1, Xueyi Ma1, Lihua Fan2   

  1. 1. School of Mechanical Engineering, Shenyang University of Technology, Shenyang 110870, China;
    2. School of Chemical Equipment, Shenyang University of Technology, Liaoyang 111000, China
  • 收稿日期:2025-02-20 修回日期:2025-07-26 接受日期:2025-07-27 出版日期:2025-11-28 发布日期:2025-08-19
  • 通讯作者: Dexi Wang,E-mail:wangdexi@sut.edu.cn
  • 基金资助:
    This research was supported by the Natural Science Foundation of Liaoning Province (2024-MSLH-360).

Thermal decomposition behavior and kinetics of magnesite under carbon dioxide atmosphere

Ze Gong1, Dexi Wang1, Xueyi Ma1, Lihua Fan2   

  1. 1. School of Mechanical Engineering, Shenyang University of Technology, Shenyang 110870, China;
    2. School of Chemical Equipment, Shenyang University of Technology, Liaoyang 111000, China
  • Received:2025-02-20 Revised:2025-07-26 Accepted:2025-07-27 Online:2025-11-28 Published:2025-08-19
  • Contact: Dexi Wang,E-mail:wangdexi@sut.edu.cn
  • Supported by:
    This research was supported by the Natural Science Foundation of Liaoning Province (2024-MSLH-360).

摘要: Using thermogravimetric experiments, the kinetic characteristics of magnesite thermal decomposition were investigated under the condition of 10% (vol) CO2 in the actual production atmosphere of an entrained-flow dynamic roasting furnace. Based on a multi - method collaborative framework, the three kinetic factors in the magnesite thermal decomposition process were systematically calculated through parameter cross - verification between the Hu - Gao - Zhang integral method and the Kissinger differential method. The kinetic mechanism was initially screened by the double equal and double step method and further determined by combining with the Malek maximum probability method. The study revealed that CO2 in the atmosphere exerts an inhibitory effect on the decomposition of carbonate species within magnesite. Furthermore, the presence of impurities (e.g., calcium carbonate) was found to interfere with the determination of reaction mechanisms via Malek's method at elevated temperatures. The results show that in a 10% (vol) CO2 atmosphere, the main decomposition temperature of magnesite ranges from 550°C to 650 °C, the average activation energy is 66.00 kJ·mol-1, the pre-exponential factor is 1.05 × 105 s-1, and the decomposition process conforms to the random nucleation and growth model.

关键词: Carbon dioxide, Reaction kinetics, Magnesite, Pyrolysis, Thermogravimetry

Abstract: Using thermogravimetric experiments, the kinetic characteristics of magnesite thermal decomposition were investigated under the condition of 10% (vol) CO2 in the actual production atmosphere of an entrained-flow dynamic roasting furnace. Based on a multi - method collaborative framework, the three kinetic factors in the magnesite thermal decomposition process were systematically calculated through parameter cross - verification between the Hu - Gao - Zhang integral method and the Kissinger differential method. The kinetic mechanism was initially screened by the double equal and double step method and further determined by combining with the Malek maximum probability method. The study revealed that CO2 in the atmosphere exerts an inhibitory effect on the decomposition of carbonate species within magnesite. Furthermore, the presence of impurities (e.g., calcium carbonate) was found to interfere with the determination of reaction mechanisms via Malek's method at elevated temperatures. The results show that in a 10% (vol) CO2 atmosphere, the main decomposition temperature of magnesite ranges from 550°C to 650 °C, the average activation energy is 66.00 kJ·mol-1, the pre-exponential factor is 1.05 × 105 s-1, and the decomposition process conforms to the random nucleation and growth model.

Key words: Carbon dioxide, Reaction kinetics, Magnesite, Pyrolysis, Thermogravimetry