A CALVET calorimeter C80 was used to analyze the thermal behavior of porous granular ANFO explosive

three commonly used heavy ANFO explosives and emulsion explosive. The mass ratios of emulsion explosive/porous granular ammonium oil blasting agent of the heavy ANFO explosives are 25/75

50/50

and 75/25. The thermal kinetic parameters of apparent activation energy (Ea)

pre-exponential factor (lnA)

and thermodynamic parameter of reaction heat (ΔH) of the five explosive samples were calculated based on the heat flux data in C80 curve with the heating rate of 0.2 K·min-1. The results show that emulsion explosive has an apparent inhibitory effect on the thermal decomposition reaction of porous granular ANFO explosive

which makes the thermal decomposition onset temperature of porous granular ANFO explosive obviously increased. The calculated values of the apparent activation energy and the onset temperature of the heavy ANFO explosives are higher than that of porous granular ANFO and emulsion explosive. It could be concluded that the thermal stability of heavy ANFO explosives is higher than that of porous granular ANFO explosive and emulsion explosive.