Abstract
The study of the thermal safety of emulsion explosives mixed with waste engine oil is very important for the safety of these types of explosives used in mine blasting. In order to study the thermal safety of emulsion explosives mixed with waste engine oil, thermal safety tests were carried out using a Differential Scanning Calorimeter (DSC), non-isothermal kinetics, and the Flynn–Wall–Ozawa method. The results show that the minor particle impurities in the filtered waste engine oil are mainly combustibles; after adding different amounts of waste engine oil, the activation energy of the emulsion matrix decreases from 110.33 kJ/mol to 75.39 kJ/mol, 74.50 kJ/mol, and 82.23 kJ/mol, and the critical temperature for thermal explosion changes from 194.16 °C to 169.73 °C, 227.47 °C, and 208.78 °C. The addition of waste engine oil reduces the activation energy of emulsion explosives. The waste engine oil is negatively correlated with the activation energy and the thermal explosion reaction temperature of emulsion explosives, and the correlation coefficient is −0.686 and −0.333. The emulsifier is positively correlated with the critical temperature of thermal explosion of emulsion explosives, and the correlation coefficient is 0.251. The small particles in the waste engine oil create a hot spot in the emulsion explosives, which reduces the thermal safety of the emulsion explosives mixed with waste engine oil. The emulsifier reduces the droplet size of the emulsion explosive, improves the oil-water interface strength, and improves the thermal safety of the emulsion explosives mixed with waste engine oil. The thermal safety of emulsion explosives mixed with waste engine oil can be improved by reducing the proportion of the sensitizer and increasing the proportion of the emulsifier.
Highlights
Emulsion explosives are widely used in the blasting of mines and the creation of tunnels, water conservancy developments, and hydropower projects [1]
If the waste engine oil produced by the mine can be used to produce emulsion explosives, it can solve the problem of the economic utilization of waste engine oil, reduce environmental pollution, and reduce production costs
In order to make extend the understanding of the thermal safety of emulsion explosives mixed with waste engine oil, this study investigates the kinetics of the thermal decomposition of emulsion explosives mixed with various waste engine oil contents using differential scanning calorimetry (DSC) and thermogravimetry (TG), and the activation energy and the critical temperatures of thermal explosion of the emulsion explosives are calculated
Summary
Emulsion explosives are widely used in the blasting of mines and the creation of tunnels, water conservancy developments, and hydropower projects [1]. A porous granular ammonium nitrate explosive was prepared with a 1:1 ratio of waste engine oil to diesel fuel at the Shenhua Zhungeer Factory [6]. 0.2 waste 0.5 engine oil contains solid particles, it is necessary to pay attention to the thermal safety of the emulsion explosives mixed with waste engine oil. This is especially important in large mines that carry out their blasting a long time after loading the boreholes. There has been little research published on the thermal safety of emulsion explosives mixed with waste engine oil. Four different formulations were designed to analyze the thermal safety of the emulsion explosives mixed with waste engine oil.
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