Preparation of basic magnesium carbonate and its thermal decomposition kinetics in air

被引：0
|
作者：
刘欣伟 [1 ,2 ]
冯雅丽 [1 ]
李浩然 [2 ]
机构：
[1] Civil and Environmental Engineering School, University of Science and Technology Beijing
[2] National Key State Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences
来源：
Journal of Central South University of Technology | 2011年 / 18卷 / 06期
基金：
中国国家自然科学基金;
关键词：
basic magnesium carbonate; TG-DTG; thermal decomposition; kinetics; mechanism function;
D O I：
暂无
中图分类号：
O614.22 [镁Mg];
学科分类号：
摘要：
The thermal decomposition process of basic magnesium carbonate was investigated. Firstly, Basic magnesium carbonate was prepared from magnesite, and the characteristics of the product were detected by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Subsequently, the thermal decomposition process of basic magnesium carbonate in air was studied by thermogravimetry-differential thermogravimetry (TG-DTG). The results of XRD confirm that the chemical composition of basic magnesium carbonate is 4MgCO3·Mg(OH)2·4H2O. And the SEM images show that the sample is in sheet structure, with a diameter of 0.1-1 μm. The TG-DTG results demonstrate that there are two steps in the thermal decomposition process of basic magnesium carbonate. The apparent activation energies (E) were calculated by Flynn-Wall-Ozawa method. It is obtained from Coats-Redfern’s equation and Malek method that the mechanism functions of the two decomposition stages are D3 and A1.5, respectively. And then, the kinetic equations of the two steps were deduced as well.
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页码：1865 / 1870
页数：6
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