Low-detonation velocity anfo explosive and preparation method thereof

Abstract

The invention relates to a low-detonation velocity anfo explosive and a preparation method thereof. The low-detonation velocity anfo explosive comprises 77-88 parts of modified powdery anfo explosive, 10-20 parts of porous granulated ammonium nitrate and 2-3 parts of polystyrene foam plastic microballoon, wherein the modified powdery anfo explosive mainly comprises 74.54-84.66 parts of crystallized ammonium nitrate, 0.15-0.26 part of modifying agent and 2.31-3.08 parts of compound oil phase; and the compound oil phase comprises 1.71-2.12 parts of paraffin, 0.58-0.86 part of rosin and 0.02-0.06 part of Span 80 emulsifying agent. The preparation method comprises the following steps of: mixing the crystallized ammonium nitrate and the modifying agent, crushing and drying; and then mixing with the compound oil phase; finally adding the porous granulated ammonium nitrate and the polystyrene foam plastic microballoon and uniformly mixing to obtain the low-detonation velocity anfo explosive with the density less than 0.55g / cm<3> and the detonation speed less than 2,600m / s. The explosive has the advantages of favorable particle flowability, convenience for filling into a blast hole, low detonation velocity, low density and capability of meeting the requirements for using the explosive on smooth surface blasting and presplitting blasting of mines, highways, railways and open-air deep-hole slopes.

Description

technical field

[0001] The invention belongs to an explosive, in particular to a low-detonation-velocity ammonium oil explosive used for open-air deep-hole slope smooth surface blasting and pre-splitting blasting and a preparation method thereof. Background technique

[0002] Deep hole blasting is an important method for mine production, large-scale excavation of railway and highway cuttings, especially in railway and highway construction, the use of smooth blasting or pre-splitting blasting can reduce the excavation volume of cutting slopes by 10-20% At the same time, because the slope is smooth and stable after blasting, it reduces the slope accidents and maintenance workload during support and subsequent line operation. Usually, the blasthole depth of smooth blasting and pre-splitting blasting is generally 10-25m, the blasthole diameter is greater than 75mm, and the charge length is 6-19m. If the charge density of the explosive is high and the detonation velocity of the e...