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Journal of Thermal Analysis and Calorimetry

, Volume 133, Issue 3, pp 1429–1437 | Cite as

Thermogravimetric analysis–mass spectrometry (TGA–MS) of hydromagnesite from Dujiali Lake in Tibet, China

  • Yongjie Lin
  • Mianping Zheng
  • Chuanyong Ye
  • Ian M. Power
Article
  • 107 Downloads

Abstract

Thermogravimetric analysis–mass spectrometry, in situ X-ray diffraction, scanning electron microscopy and Fourier transform infrared spectroscopy were used to characterize hydromagnesite [Mg5(CO3)4(OH)2·4H2O] from Dujiali Lake in Tibet, China. This study describes the variations in the thermal decomposition mechanisms of hydromagnesite at varying heating rates and under either helium (He) or carbon dioxide (CO2) atmospheres. In a He atmosphere, only two decomposition stages were observed; the loss of the crystalline water followed by the combined dehydroxylation and decarbonation. However, under a CO2 atmosphere, the dehydroxylation and decarbonation occur separately as the inert CO2 gas prevents the decomposition of the MgCO3 component of hydromagnesite. Overall, the thermal decomposition is an endothermic process. A distinctly exothermic process occurs at about 540 °C under conditions of high partial pressure of CO2 or high heating rate and implies the crystallization of magnesite (MgCO3). We propose that the release of H2O and CO2 at different stages likely results from the complicated hydrogen bonds and different carbonate groups in the crystal structure of hydromagnesite.

Keywords

Hydromagnesite TGA–MS Thermal decomposition In situ XRD FT-IR 

Notes

Acknowledgements

The authors would like to thank Dr. Hongde Xia and Dr. Kai Wei of the Institute of Engineering, Thermophysics, Chinese Academy of Sciences for experimental support on thermogravimetric analysis/mass spectrometry measurements, and Dr. Zhenfei Lv of the China University of Geoscience for his help with the Fourier transform infrared spectroscopy. This research was supported by The National Key Research and Development Program of China (Grant Number: 2017YFC0602704), National Natural Science Foundation of China (Grant Numbers: 41473061, 41603048 and U1407207) and China Geological Survey (Grant Number: DD20160025).

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  1. 1.Institute of Mineral ResourcesChinese Academy of Geological SciencesBeijingChina
  2. 2.School of Earth Sciences and ResourcesChina University of GeosciencesBeijingChina
  3. 3.Trent School of the EnvironmentTrent UniversityPeterboroughCanada

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