Thermogravimetric and mass-spectrometric analyses of combustion of spent potlining under N2/O2 and CO2/O2 atmospheres

Bibliographische Detailangaben
Veröffentlicht in:	Waste management (New York, N.Y.). - 1999. - 87(2019) vom: 15. März, Seite 237-249
1. Verfasser:	Sun, Guang (VerfasserIn)
Weitere Verfasser:	Zhang, Gang, Liu, Jingyong, Xie, Wuming, Kuo, Jiahong, Lu, Xingwen, Buyukada, Musa, Evrendilek, Fatih, Sun, Shuiyu
Format:	Online-Aufsatz
Sprache:	English
Veröffentlicht:	2019
Zugriff auf das übergeordnete Werk:	Waste management (New York, N.Y.)
Schlagworte:	Journal Article Oxy-fuel combustion Spent potlining TG-MS Thermodynamic analysis Carbon Dioxide 142M471B3J

Beschreibung
Zusammenfassung:	Copyright © 2019 Elsevier Ltd. All rights reserved. Thermal decomposition and gaseous evolution of the spent potlining (SPL) combustion were quantified using thermogravimetric and mass-spectrometric analyses in CO2/O2 and N2/O2 atmospheres using three heating rates (15, 20 and 25 °C/min). The thermal decomposition of SPL occurred mainly between 450 and 800 °C. Based on the four kinetic methods of Friedman, Starink, Kissinger-Akahira-Sunose and Flynn-Wall-Ozawa under the various conversion degrees (α) from 0.1 to 0.7, the lowest apparent activation energy was estimated at 149.81 kJ/mol in the 70% CO2/30% O2 atmosphere. The pre-exponential factor, and changes in entropy, enthalpy and free Gibbs energy were also estimated. The reaction model did not suggest a single reaction of the SPL combustion. With the α value of 0.25-0.7, the following function best described the reaction based on the Malek method: f(α) = 1/2α and G(α) = lnα2. The gases released during the combustion process included CO2, CO, NOx, HCN, and HF
Beschreibung:	Date Completed 12.09.2019 Date Revised 12.09.2019 published: Print-Electronic Citation Status MEDLINE
ISSN:	1879-2456
DOI:	10.1016/j.wasman.2019.01.047