Research of thermal decomposition kinetic characteristic of emulsion explosive base containing Fe and Mn elements

摘要

The kinetic characteristic of thermal decomposition of the Emulsion Explosive Base Containing Fe and Mn elements (EEBCFM) which was used to prepare nano-MnFe2O4 particles via detonation method was investigated by means of non-isothermal DSC and TG methods at various heating rates of 2.5, 5 and 7.5 degrees C min(-1) respectively under the atmosphere of dynamic air from room temperature to 400 degrees C. The results indicated that the EEBCFM was sensitive to temperature, especially to heating rate and could decompose at the temperature up to 60 degrees C. The maximum speed of decomposition (d alpha/dT)(m) at the heating rate of 5 and 7.5 degrees C min(-1) was more than 10 times of that at 2.5 degrees C min(-1) and nearly 10 times of that of the second-category coal mine permitted commercial emulsion explosive (SCPCEE). The plenty of metal ions could seriously reduce the thermal stability of emulsion explosive, and the decomposition reaction in the conversion degree range of 0.0 similar to 0.6 was most probably controlled by nucleation and growth mechanism and the mechanism function could be described with Avrami-Erofeev equation with n=2. When the fractional extent of reaction alpha > 0.6, the combustion of oil phase primarily controlled the decomposition reaction.