Experimental study of the pyrolysis path of CaSO.sub.3·1/2H.sub.2O

Simultaneous DSC-TGA (SDT) and Fourier transform infrared spectrometer (FTIR) and diffuse reflectance in situ Fourier transform spectroscopy (DRIFTs) were used to study the thermogravimetric behavior and the reaction path of hemihydrate calcium sulfite in nitrogen atmosphere. The gas phase products...

Full description

Saved in:
Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2022-11, Vol.147 (22), p.12431
Main Authors: Han, Yong-Qiang, Yang, Rui-Ming, Dong, Yuan, Tong, Hui-Ling
Format: Article
Language:English
Subjects:
Nitrogen
Pyrolysis
Sulfites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Simultaneous DSC-TGA (SDT) and Fourier transform infrared spectrometer (FTIR) and diffuse reflectance in situ Fourier transform spectroscopy (DRIFTs) were used to study the thermogravimetric behavior and the reaction path of hemihydrate calcium sulfite in nitrogen atmosphere. The gas phase products and solid phase products were detected by FTIR. The main conclusions are as follows: in the thermal decomposition process, disproportionation reaction starts at 853 K: 4CaSO.sub.3 [right arrow] CaS + 3CaSO.sub.4, and decomposition reaction and desulfurization reaction start simultaneously at 963 K: CaSO.sub.3 [right arrow] CaO + SO.sub.2, CaS + 2SO.sub.2 [right arrow] CaSO.sub.4 + S.sub.2(g), and disproportionation reverse reaction starts at about 1053 K: CaS + 3CaSO.sub.4 [right arrow] 4CaO + 4SO.sub.2, calcium sulfate decomposition reaction begins at 1393 K: CaSO.sub.4 [right arrow] CaO + SO.sub.2 + 1/2O.sub.2. The oxidation temperature and reaction products were obtained through oxidation experiments, which proved that the calcium sulfite has sufficient thermal stability at ambient temperature.
ISSN:1388-6150
DOI:10.1007/s10973-022-11477-3