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| Characteristic and Model of Thermal Decomposition of Magnesite |
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Received:July 07, 2017
Revised:July 10, 2017
Accepted:July 13, 2017
Published Online:December 20, 2017
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| DOI：doi：10.3969/j.issn.1007-7545.2018.01.015 |
| KeyWord:magnesite; TG-DSC; thermal decomposition kinetics; mechanism function |
| Author | Institution |
| JIAO Kai |
北京科技大学 钢铁共性技术协同创新中心 |
| YUAN Zhang-fu |
北京科技大学 钢铁共性技术协同创新中心 |
| ZHANG Li-na |
冶金工业规划研究院 能源处 |
| XIE Shan-shan |
北京科技大学 钢铁共性技术协同创新中心 |
| LI Lin-shan |
大石桥市信威耐火材料有限公司 总工办 |
| SUI Dian-peng |
东北大学 理学院化学系 |
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| Abstract: |
| Thermal decomposition model of magnesite was investigated by TG-DSC analysis with magnesite (900 μm) as raw material. The result shows magnesite begins to decompose at about 800 K and completely decomposes at around 950 K. DSC curve shows one downward peak corresponding to weight loss process, indicating that decomposition reaction of magnesite is one-step and endothermic. With increase of heating rate, magnesite needs higher temperature to achieve the same degree of decomposition. Average activation energy of thermal decomposition of magnesite is 260.54 kJ/mol calculated by Flynn-Wall-Ozawa Method and Kissinger Method. Magnesite decomposition reaction model was discussed by Malek Method. Thermal decomposition reaction of magnesite is two-dimensional phase boundary reaction as cylindrical symmetric model. The kinetic equation of magnesite is G(α)= . |
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