Emulsified ammonium nitrate fuel oil explosive and preparation method thereof

Abstract

The invention relates to a novel emulsified ammonium nitrate fuel oil explosive and a method for preparing the explosive. Porous granular ammonium nitrate and machine oil are mixed to prepare an ammonium nitrate fuel oil mixture; and a sensitized emulsified explosive and wood flour are added into the ammonium nitrate fuel oil mixture so as to be mixed to form the emulsified ammonium nitrate fuel oil explosive. The explosive has a good performance, is convenient to use, and high in safety during a preparation, storage and transportation process, and can be mainly applied in underground ore mine exploitation and blasting of other application occasions, especially the blasting of middle hard rocks.

Description

technical field [0001] The invention relates to a novel emulsified ammonium oil explosive, and also relates to a preparation method of the emulsified ammonium oil explosive, which can be mainly used for underground iron ore mining and other blasting suitable for occasions, especially medium-hard rock blasting. Background technique [0002] At present, there are several kinds of explosives with ammonium nitrate, especially porous granular ammonium nitrate as the main oxidant, which can be mainly divided into the following types: (1) Granular ammonium oil explosives: composed of 94.5% porous granular ammonium nitrate and 5.5% fuel oil ( Composed of diesel oil), this kind of industrial explosive has the advantages of wide source of raw materials, low cost, easy preparation, and convenient use. The disadvantage is that it lacks water resistance and low volume power; Unsensitized latex matrix is ​​mixed. This emulsified ammonium oil explosive has the advantages of ammonium oil ex...

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Problems solved by technology

[0002] At present, there are several kinds of explosives with ammonium nitrate, especially porous granular ammonium nitrate as the main oxidant, which can be mainly divided into the following types: (1) Granular ammonium oil explosives: composed of 94.5% porous granular ammonium nitrate and 5.5% fuel oil ( Composed of diesel oil), this kind of industrial explosive has the advantages of wide source of raw materials, low cost, easy preparation, and convenient use. The disadvantage is that it lacks water resistance and low volume power; Unsensitized latex matrix is ​​mixed. This emulsified ammonium oil explosive has the advantages of ammonium oil explosive and emulsion explosive. When in bulk, the energy per meter of this product is 40% higher than that of ordinary ammonium oil explosive. And it has a certain water resistance, and can be used in wet blastholes. The disadvantage is that the storage period is short, and the latex matrix is ​​easy to devitrify and harden, which affects the explosive performance of the charge and explosives, and even resists explosion; (3) Expanded explosives: ammonium nitrate High-temperature supersaturated water is dissolved, mixed with the melted oil phase material, vacuumized under negative pressure to remove water, cooled and lowered, and then squeezed and crushed, mixed with various additives to form a powdery expanded explosive, which has a relatively high explosion sensitivity. Good, the disadvantages are high manufacturing cost and energy consumption, low explosive density, poor fluidity and water resistance; (4) Paste emulsion explosives: relatively high detonation velocity and violence, but because the emulsion explosive contains about 10% Water, the water contained in the explosives turns into steam to absorb a large amount of heat energy during the explosive explosion process, which leads to the lower working ability of the explosives compared with industrial powder explosives, and the uncoupled charge when the finished packaged emulsion explosive roll is used, so that When using emulsion explosives, the hole pressure is relatively low, and the blasting throwing effect is not ideal. Especially, the use of paste-like emulsion explosives in medium-hard rocks for engineering blasting cannot achieve good blasting results. This is why many blasting engineers are reluctant to use paste. Reasons for choosing powdery industrial explosives for blasting operations instead of emulsified explosives

[0003] The above-mentioned types of explosives have their own advantages and disadvantages, and are suitable for different use occasions, but there are still use requirements that cannot be met by these types alone.

For example, many underground iron mines in Hebei Province and some surrounding areas adopt the method of upward hole pressure gas charging and blasting, which requires the use of viscous explosives. However, in the production process of viscous explosives under the existing technology, toxic components such as TNT are generally added and there are Defects such as short storage period, easy hardening, and high price

In addition, due to the small production capacity of this type of viscous explosives, some user companies also need to use an air-compressed charge machine to blow powdered puffed explosives into the blast hole. Nearly 10%, so that the waste of explosives is very serious, causing serious pollution to the mining face, and forming a safety hazard

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