Study on the performance of low detonation velocity emulsion explosive with waste coal gangue as inert agent
In order to develop a low cost emulsion explosive with low detonation velocity and use a large amount of waste coal gangue to reduce environmental pollution,three kinds of coal gangue powder with different particle sizes as inert agents were added to the emulsion explosive to carry out detonation velocity test,air blast shock wave overpressure test and TG-DSC synchronous thermal analysis.The experimental results show that with the coal gangue powder content increasing from 0％to 40％,the detonation velocity was decreasing,the detonation velocity of the explosive containing powder with smaller particle size is lower,and the detonation velocity decreases to 2 755 m/s when the powder content of 3 # reaches 40％.The peak overpressure of air blast wave decreased from 48.53 kPa to 22.23 kPa,the positive pressure time increased from 343.15 μs to 426.10 μs,the pressure rise rate decreased from 2.210 9 kPa/μs to 0.369 1 kPa/μs,and the positive phase impulse decreased by 25.44％.It can be seen that coal gangue can effectively reduce the detonation velocity and detonation impact load of emulsion explosive.The thermal analysis results show that the coal gangue powder does not change the thermal decomposition results of emulsion explosive,and only reduces the thermal decomposition temperature by 29～34 ℃,which is still in the reasonable thermal decomposition temperature range of emulsion explosive.
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