东北大学学报(自然科学版) ›› 2025, Vol. 46 ›› Issue (3): 52-59.DOI: 10.12068/j.issn.1005-3026.2025.20230290

• 材料与冶金 • 上一篇    下一篇

工业废弃物水氯镁石热分解行为与动力学研究

徐寒露, 董辉(), 赵亮, 程道宽   

  1. 东北大学 冶金学院,辽宁 沈阳 110819
  • 收稿日期:2023-10-13 出版日期:2025-03-15 发布日期:2025-05-29
  • 通讯作者: 徐寒露
  • 作者简介:徐寒露(1996—),女,辽宁锦州人,东北大学博士研究生
    董 辉(1969—),男,辽宁锦州人,东北大学教授,博士生导师.
  • 基金资助:
    国家重点研发计划项目(2020YFC1909303)

Study on Thermal Decomposition Behavior and Kinetics of Industrial Waste Bischofite

Han-lu XU, Hui DONG(), Liang ZHAO, Dao-kuan CHENG   

  1. School of Metallurgy,Northeastern University,Shenyang 110819,China.
  • Received:2023-10-13 Online:2025-03-15 Published:2025-05-29
  • Contact: Han-lu XU
  • About author:DONG Hui E-mail: Helenxululu@outlook.com

摘要:

为了确定水氯镁石热解行为和动力学参数,在不同升温速率下对其进行了热重分析.依据微商热重分析(DTG)和热重分析(TGA)曲线将水氯镁石分解分成第Ⅱ阶段(73.92~278.14 ℃)、第Ⅲ阶段(278.14~540.27 ℃)和第Ⅳ阶段(540.27~849.52 ℃)3个主要的质量损失过程,并利用多阶段反应分离(K-K)法进一步划分DTG曲线重叠部分.通过XRD与傅里叶变换红外(FTIR)光谱分析热解产物,明确了水氯镁石的分解机理:脱水由Mg—O—H键断裂引发,而Mg—O键增强则促使水解反应发生,阻碍脱水.最终,采用Friedman法测定了子反应活化能,结合自定义反应函数与动力学补偿效应,构建了热解动力学模型.

关键词: 水氯镁石, 脱水反应, 热解, 动力参数, 热重分析

Abstract:

Thermogravimetric analysis was carried out at different heating rates to determine the pyrolysis behavior and kinetic parameters of bischofite. Based on the differential thermogravimetry (DTG) and thermogravimetric analysis (TGA) curves, the bischofite pyrolysis was divided into three main mass-loss processes, namely, stage Ⅱ (73.92~278.14 ℃), stage Ⅲ (278.14~540.27 ℃) and stage Ⅳ (540.27~849.52 ℃). The multi-stage reaction separation (K-K ) method was utilized to further divide the overlapping DTG curves. The pyrolysis products were analyzed by XRD and Fourier transform infrared (FTIR) spectroscopy, and the pyrolysis mechanism of bischofite was clarified that the dehydration is triggered by the breakage of the Mg—O—H bond, while the enhancement of the Mg—O bond prompts the hydrolysis reaction and hinders the dehydration. Finally, the activation energy of the sub-reaction was determined by Friedman’s method, and the pyrolysis kinetic model was constructed by combining the customized reaction function with the kinetic compensation effect.

Key words: bischofite, dehydration reaction, pyrolysis, kinetic parameters, thermogravimetric analysis

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