Preparation of basic magnesium carbonate and its thermal decomposition kinetics in air |
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| Authors: | Xin-wei Liu Ya-li Feng and Hao-ran Li |
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| Affiliation: | (1) Experimental Center, Hebei Normal University, Shijiazhuang, 050016, People’s Republic of China;(2) College of Chemistry and Material Science, Hebei Normal University, Shijiazhuang, 050016, People’s Republic of China;(3) Department of Chemistry, Handan College, Handan, 056005, People’s Republic of China;(4) College of Chemistry and Pharmacy Engineering, Hebei University of Science and Technology, Shijiazhuang, 050018, People’s Republic of China; |
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| Abstract: | 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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| Keywords: | basic magnesium carbonate TG-DTG thermal decomposition kinetics mechanism function |
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