Thermal decomposition kinetics of carbide slag in air atmosphere

Abstract

In this study, the thermal decomposition characteristics and kinetics of carbide slag were evaluated by simultaneous measurements of thermogravimetry (TG)/differential thermal (DTA) analyses under air atmosphere. The data revealed that mass thermal decomposition processes could be divided into three stages, in which the last two stages at 400-490°C and 710-790°Cunderwent largest thermal decomposition weight loss. The thermal decomposition kinetic parameters were calculated by the Kissinger method and the corresponding apparent activation energies were estimated to 204.00 and 311.40kJ·mol−1, respectively. The respective natural logarithms of pre-exponential factor (In A) calculated by Kissinger method were 1.07×1011 and 1.77×1012. For comparison, the thermal decomposition kinetic parameters were also calculated by FWO peak maximum evolution and FWO isoconversional methods. The apparent activation energies of the two last stages were recorded as 205.71 and 313.12kJ·mol−1, respectively.