Inorganic quick-setting perfusion blasting pore sealing material for mining, and preparation method thereof

Abstract

The invention provides an inorganic quick-setting perfusion blasting pore sealing material for mining, wherein the pore sealing material comprises, by weight, 25-50 parts of sulphoaluminate cement clinker, 20-40 parts of gypsum, 5-10 parts of lime, 25-40 parts of fly ash, 0.5-3 parts of a composite admixture, and 80-110 parts of water, wherein the composite admixture comprises, by weight, 50-75 parts of a water reducing agent, 10-30 parts of anhydrous sodium sulfate, 2.5-25 parts of sodium metaaluminate, and 1-10 parts of a gas generation agent. According to the present invention, the processof the preparation method is simple; the prepared pore sealing material has characteristics of large slurry fluidity and good water retention property, wherein the initial setting time is adjusted within 20-35 min, the vertical expansion rate after hardening is 1-10%, and the 1.5 h compressive strength is 2-4 MPa; and the method has advantages of simple construction process, low labor intensity, low production cost and the like, does not generate three-waste, can utilize solid waste, and does not affect the environment.

Description

technical field [0001] The invention belongs to the technical field of coal mine hole sealing, and in particular relates to a mine-used inorganic quick-setting perfusion blasting hole sealing material and a preparation method thereof. Background technique [0002] Coal mine deep hole blasting is a commonly used technical means such as roof pre-splitting and coal body pressure relief. According to the regulations, the sealing depth is generally not less than 1 / 3 of the hole depth. The blasting sealing is to effectively resist and buffer deep hole blasting. The impact stress wave generated by the explosive reduces the loss of blasting energy, fully utilizes the energy of the explosive, and improves the effect of pre-splitting blasting. At present, the blasting mud filling method is mainly used, which has problems such as low efficiency and high labor intensity. When the pounding is not solid, the blasting mud will be rushed out, which seriously affects the blasting effect. Th...

AI Technical Summary

Problems solved by technology

At present, the blasting mud filling method is mainly used, which has problems such as low efficiency and high labor intensity. When the pounding is not solid, the blasting mud will be rushed out, which seriously affects the blasting effect.

There are many safety procedures in coal mine blasting, and power outages and evacuation are required, which will affect other mining operations. Especially in large-diameter and deep-hole blasting, it takes 2 to 3 hours to fill the blasting mud. In addition to other procedures, one shift can only Complete 1 to 3 drilling and blasting, and the labor intensity is very high

[0003] The perfusion sealing is to pour the liquid sealing material into the sealing section, and the blasting sealing section will be formed naturally after the slurry solidifies. At present, ordinary cement is used as the pouring material to add quick-setting agent composite materials. Although the setting time is short, it can meet the requirements. The strength time is long, and it usually needs to be maintained for more than 6 hours before the blasting can be carried out, while the deep hole blasting generally requires that it must be completed on duty, and the waiting time is long, which will seriously affect the normal blasting operation

Although the solidification speed of polymer materials is fast, the effect of rapid hole sealing can be achieved, but the reaction temperature during the consolidation process is as high as 200 ° C, which has serious safety hazards. The organic components burn during the blasting process, which will produce toxic and harmful gases. There is a large difference in mud materials

[0004] At present, there is no sealing material with fast consolidation and solidification, high strength, low reaction temperature, high safety and no pollution.