Microbial seal-healing capsule for coal mine air leakage plugging as well as preparation method and application of microbial seal-healing capsule

Abstract

The invention discloses a microbial seal-healing capsule for coal mine air leakage plugging as well as a preparation method and application of the microbial seal-healing capsule. Dry powder of bacterial spores is uniformly dispersed in water, a suitable substrate is selected according to the kinds of the bacterial spores, the substrate is added into a uniformly-dispersed mixed solution according to a certain ratio of the bacterial spores to the substrate and is uniformly stirred to be agglomerated, the agglomerated mixture is slowly added into a multifunctional granulator and is extruded, a cooling system is started, the temperature of the material is maintained, and the extruded strip-shaped substance is added into a rounder for rounding and is sieved and dried to obtain microparticles; and the microbial seal-healing capsule is prepared from the microparticles and a wall material by using a vacuum impregnation method or an interfacial polymerization method, the microbial seal-healingcapsule and a main material for air leakage plugging are mixed to be used, once concrete is cracked, the spores inside the material can be activated to normally metabolize, and calcium carbonate is continuously induced to be precipitated, so that the self-repair of cracks is realized.

Description

Technical field [0001] The invention relates to a coal mine air leakage plugging material, in particular to a coal mine air leakage plugging microorganism self-healing capsule, and a preparation method and application thereof. Background technique [0002] Coal spontaneous combustion is a major hidden danger that threatens the safety of coal mines in our country. Stopping air leakage is an important measure to prevent spontaneous combustion of coal. Cement materials, fly ash foam materials, polymer spraying materials, colloids, clay composite materials, foam materials, and polymer elastomers are currently commonly used wind-stopping materials. These materials have played an important role in ensuring safe production in coal mines. However, the existing wind-stopping materials will inevitably produce a large number of micro-cracks under the action of rock pressure. If these micro-cracks cannot be found and repaired in time, they will communicate with the goaf and form air leakage...

AI Technical Summary

Problems solved by technology

However, the existing air leakage plugging materials will inevitably produce a large number of micro-cracks under the action of mine pressure. If these micro-cracks cannot be found and repaired in time, they will communicate with the goaf and form air leakage channels, which will cause coal mines in the goaf. Spontaneous combustion, causing irreparable economic losses and casualties

[0003] For cracks in air plugging materials, the current main repair methods are post-event repair or regular repair. However, this passive and planned repair method is mostly aimed at cracks that are visible to the naked eye. Due to the limitations of other problems, the cracks are prone to secondary cracking

In addition, in the actual leak plugging material, there are many microcracks inside. Due to the limitations of the current detection technology, it is still difficult to detect and repair these microcracks.

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