A kind of low-density ammonium oil explosives and its preparation method and application

Abstract

The invention provides a low-density ammonium nitrate fuel oil explosive, and a preparation method and application of the low-density ammonium nitrate fuel oil explosive. The low-density ammonium nitrate fuel oil explosive is prepared from the following raw materials in parts by weight: 86 to 90.7 parts of porous granulated ammonium nitrate, 4 to 9 parts of perlite particles and 5.0 to 5.3 parts of diesel oil. The preparation method comprises the following steps: (1) preparing the porous granulated ammonium nitrate, the perlite particles and the diesel oil in parts by weight; (2) uniformly mixing the porous granulated ammonium nitrate, the perlite particles and the diesel oil, thus obtaining the low-density ammonium nitrate fuel oil explosive. The application is characterized by applying the low-density ammonium nitrate fuel oil explosive in open-pit coal step loose blasting. The low-density ammonium nitrate fuel oil explosive provided by the invention is low in cost, small in blasting unit consumption, good in blasting effect and beneficial for increasing the block coal rate and increasing the economic benefit. The preparation method provided by the invention is simple and easy to operate and is also matched with conditions of an open-pit coal mine. According to the application of the low-density ammonium nitrate fuel oil explosive in the open-pit coal step loose blasting, disclosed by the invention, secondary charging is avoided, the probability that blast holes and blasting devices are crushed by an explosive truck is reduced, the blasting quality is favorably increased, and major hidden dangers are removed.

Description

technical field [0001] The invention belongs to the field of coal mine blasting, in particular to a low-density ammonium oil explosive and its preparation method and application. Background technique [0002] The coal seam designed to be mined in Heidaigou Open-pit Coal Mine is Permian 6 # The coal seam, with an average thickness of 31m, is a composite coal seam, divided into 6 上 、6 中 、6 下 three floors. 6 of them 上 10m, 6 中 16m, 6 下 5m, high-quality coal concentrated in 6 中 Coal seam, calorific value 4200-5700kcal, coal quality is ultra-low phosphorus, low sulfur, medium ash, high ash melting point long-flame coal, distributed nearly horizontally. The average thickness of the overburden of the upper coal seam is 56m, and the average thickness of the loess layer is 45m. The coal seam adopts a single bucket-truck-ground crushing station-belt conveyor semi-continuous mining process. Because the coal steps are mined in three layers, the on-site working face is narrow (...

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Problems solved by technology

[0009] (3) The density of porous granular ammonium oil explosives is relatively high, so the unit consumption of explosives is high and the cost of blasting is large;

[0010] (4) The filling height is 7 meters, the pulverized coal filling is light, the filling quality is not good, flying blocks are easy to be generated, and the blasting safety is difficult to control;

[0011] (5) Each hole needs to be completed by the explosive vehicle after two intervals of charging, which increases the probability of the explosive vehicle rolling over the blast hole and the detonating equipment, which is not conducive to improving the blasting quality, and there are major safety hazards;

[0013] (7) The existing types of low-density explosives have low production capacity and efficiency, and cannot meet the requirements of large-scale use in large-scale open-pit coal mines, and there is no precedent for large-scale use of low-density explosives in coal seam blasting in domestic open-pit mines

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