Colloidal emulsion explosive for underground mining and preparation method thereof

Abstract

Disclosed is a novel underground mine gel emulsion explosive. The explosive is mainly prepared from ammonia nitrate,sodium nitrate,a compound oil phase,water,sensitizer,a viscosity reducer,a thickening agent and a thickening agent wrapping film material. The viscosity reducer is used for reducing the viscosity of the emulsion explosive,pumping resistance is lowered,and it is ensured that the emulsion explosive can be smoothly pumped into a gun hole. Meanwhile,the thickening agent wrapped by micro-capsules is added into the emulsion explosive,in the pumping and spraying charging process of thethickening agent wrapped by micro-capsules,due to the extrusion,friction and spraying collision effects,the micro-capsules are damaged,enable the thickening agent to be exposed,and react with water inthe emulsion explosive,and the viscosity of the underground mine gel emulsion explosive after the explosive reaches the gun hole is enhanced,so that the problem that charging and recharging of the hole are serious on an underground mine is effectively solved. Meanwhile the underground mine gel emulsion explosive is good in detonation performance,and the requirement for storage stability is met.

Description

technical field [0001] The invention relates to an explosive, more specifically a colloidal emulsion explosive for underground mines, in particular to a colloidal emulsion explosive for underground mines which utilizes microcapsule technology to realize thickening in holes and a preparation method thereof. Background technique [0002] Due to the pressure of environmental protection and sustainable development, the mining trend of my country's mineral resources is shifting from open pit to underground, and from underground to deep mining. In the mining and blasting of underground mines, powdery emulsion explosives and gelatinous emulsion explosives are mainly used. The powdery emulsion explosive is loaded by pneumatic mechanical charging. Since the powder is not viscous, the phenomenon of powder return is serious when it is loaded upward to the blast hole. The actual charge in the blast hole is far less than the predetermined value, which affects the blasting effect; moreov...

AI Technical Summary

Problems solved by technology

The powdery emulsion explosive is loaded by pneumatic mechanical charging. Since the powder is not viscous, the phenomenon of powder return is serious when it is loaded upward to the blast hole. The actual amount of charge in the blast hole is far less than the predetermined value, which affects the blasting effect; moreover, the powder that falls back from the blast hole seriously pollutes the working environment, and the working flour is dusty, which seriously damages the physical and mental health of the staff.

For ordinary colloidal emulsion explosives, the viscosity of latex matrix will increase rapidly after sensitization and the fluidity is poor, and its pumping problem has not been effectively solved. The method of solving the pumping problem by increasing the fluidity of the emulsified matrix, and It will reduce the viscosity of the emulsion explosive in the blast hole and prevent it from adhering in the blast hole, resulting in an increase in the return rate

However, in the traditional sense, the fluidity and adhesion of emulsion explosives are a pair of mutually restrictive factors. When the fluidity of emulsion explosives is required to be good, that is, the friction with the delivery pipe wall is small, and its adhesion is required to be weak; When the emulsion explosive is required to have strong adhesion, it can be well attached to the wall of the blast hole, but it will seriously affect the pumping effect

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