Water gel explosive with low detonation velocity for mining and method for producing same

Abstract

The invention discloses a low-exploding slurry explosive and preparing method, which comprises the following parts: 15-30% ammonium nitrate solution, 22-32% methylamine nitrate solution, 8-15% sodium nitrate, 0.8-0.9% sesban powder, 12-15% calcium carbonate, 0.7-3.4% hydrophobic pearlite, 0.3-0.6% polystyrene plastic ball, 0.2-0.4% cross linker and 18-30% composite water resistance grain-sized ammonium nitrate. The preparing method comprises the following steps: preparing ammonium nitrate solution and composite water resistance grain-sized ammonium nitrate (the grain size is 3-5 mm); adding ammonium nitrate solution, methylamine nitrate solution, sodium nitrate, sesban powder, calcium carbonate, hydrophobic pearlite, polystyrene plastic ball, cross linker and composite water resistance grain-sized ammonium nitrate in the mixing tank; blending evenly; loading.

Description

technical field [0001] The present invention relates to an explosive and its manufacturing method, in particular to a method for blasting dangerous working faces containing gas and coal dust explosions in coal mines, controlling the degree of coal falling in blasting, or controlling blasting on the eye surface around the roadway, or low gas permeability. Coal mine permissible low detonation velocity water gel explosive used in gas outburst coal seam drainage hole pre-splitting antireflection control blasting and its manufacturing method. Background technique [0002] In the controlled blasting of roadways and working faces where gas and coal dust explosions are dangerous, in order to control the degree of falling coal lumps or reduce the damage to surrounding rock or coal by blasting, there is an urgent need for a coal mine-approved explosive with low explosion velocity and high power. . For example, in the smooth blasting construction of the roadway, loading the explosive ...

AI Technical Summary

Problems solved by technology

[0003] At present, there are many types of low-detonation velocity explosives at home and abroad, and can refer to the low-detonation-velocity expanded ammonium nitrate explosive and its preparation method invented by Lu Chunxu et al. The main preparation process is to dilute ammonium nitrate with inert substances such as combustibles and perlite to reduce the detonation velocity. See Chinese Patent No. 02137848.7; Lu Chunxu etc. invented industrial low detonation velocity mixed explosives and its preparation method, adding No. 2 rock powdery ammonium nitrate explosives into heavy metal oxides or industrial black powder to reduce detonation velocity, see Chinese Patent No. 89105369.7; Zhang Hongfeng et al. Detonation velocity type seismic source powder column, by changing the charge structure, using decommissioned black gunpowder with high energy explosive as the detonator to make low detonation velocity type seismic source powder column, see Chinese patent 03217158.7; foreign countries use TNT, RDX, PETN and other simple explosives as the explosive group Parts, using polymer plastics as adhesives, using gas blowing method or chemical foaming method to generate bubbles, and obtaining low detonation velocity foam explosives after solidification, the above explosives and their preparation methods can obtain a detonation velocity of 1800 ~ 2500m / s Low detonation velocity explosives, but there are the following defects: (1) can not be used in the working face with the risk of gas and coal dust explosion; (2) the energy density of explosives is low; Sensitive ingredients such as gunpowder, poor production safety