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Review of knowledge on safety and civilization of detonators: technical measures for blasting safety

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Review of knowledge on safety and civilization of detonators: technical measures for blasting safety

Date of release:2018-12-24 Author: Click:

Technical Measures for Blasting Safety

Blasting materials such as explosives and detonators are a major unsafe factor in the process of detonation. We should not only grasp its performance, but also analyze its possible relationship with specific external interference conditions.

1. Thermal sensitivity of explosives

When the sensitivity of explosive to ignition is measured, the fuse is placed next to a certain amount of explosive, so that one end of the fuse is 1 cm away from the explosive. The effect of Mars on the explosive is observed. The test proves that all modern industrial explosives will not burn in such a sample test. For example, ammonium nitrate explosives are placed in iron pots without mixing other impurities, heated with open fire outdoors to melt ammonium nitrate. Without any covering, ammonium nitrate explosives will not burn, and ammonium nitrate explosives are directly ignited by open fire. If ammonium nitrate explosives are stacked in well-ventilated pilot tunnels, ammonium nitrate will burn out in a few minutes, but it may not produce explosions. But if the environmental conditions change, such as the ammonium nitrate dissolved in the iron pot put a book under pressure, it will change the heat dissipation condition very quickly and cause the ammonium nitrate explosion in the pot immediately. For example, the ammonium nitrate ignited in the one-headed tunnel with poor heat dissipation will quickly change from combustion to detonation. Although some weak Mars will not directly ignite explosives, it can ignite some flammable substances, especially rigid ones. Exit Rock Ammonium Nitrate contains volatile diesel gas, which is easy to fuel right-burner ignition.

Therefore, the conditions of thermal sensitivity of explosives should be fully understood. As far as safety is concerned, all thermal shock conditions must be excluded. Initiator villages (such as detonators) are more sensitive to impact. They impact explosives with a load of 5 kg. If the explosives fall at a height of 2-4 cm, they may explode. For example, if the road is uneven and the electric detonator is carried by bicycle, how can it explode? For example, if the electric detonator is impacted by iron braze into the blockage in the blasting operation, it may also explode. Therefore, special precautions should be taken against explosives that are more sensitive to impact (lead azide, RDX, etc.).

2. The discharge phenomenon of early detonation lightning stroke caused by inductance is extremely complex. Whether the detonator's foot line is in closed or closed state, inductance effect may be produced to detonate the detonator. Electrostatic induction also occurs in low clouds. In addition, both frictional electrostatic induction and stray current may cause the detonation of the cotransistor.


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