A nano-microbubble material for in-situ consolidation modification of pulverized coal and its preparation method

Abstract

The invention discloses a nano-microbubble material for in-situ consolidation modification of pulverized coal and a preparation method thereof, comprising: 40-60 parts of Portland cement particles, 0.5-1 part of plant-type cement foaming agent, polyurethane 0.2 parts of foam stabilizer, 0.8-1.2 parts of speed control agent, 1-2 parts of water glass, 1-1.5 parts of early strength agent; after adding high-efficiency dispersant, crush the particle size of Portland cement particles and speed control agent to nanometer Grade; add foaming agent and foam stabilizer to container A and mix to make foaming liquid to be used; add the above-mentioned nano-scale Portland cement particles and nano-scale speed control agent into container B, and add water glass and early strength agent , stirring and mixing in a specific environment to form a nanomaterial slurry; finally, the foaming liquid to be used for foaming is mixed with the nanomaterial slurry in a static mixer to form a nano-microbubble material. After the soft coal body in the coal seam is consolidated by the nano-microbubble material, it not only has high stability, but also has a good air permeability effect, which is convenient for subsequent gas drainage.

Description

technical field [0001] The invention relates to a material for coal body consolidation and a preparation method thereof, in particular to a nano-microbubble material for in-situ consolidation modification of pulverized coal and a preparation method thereof. Background technique [0002] In the process of coal mining, with the increase of coal mining depth and gas content, gas outburst accidents often occur, especially in high gas and extremely soft coal seams, where gas disasters are more serious. At present, in order to reduce the losses caused by gas outburst accidents, protective layer mining and pre-extraction of gas are usually used to reduce the gas content in coal seams, so as to achieve the purpose of safe mining. However, in some high-gas coal mines in the south, certain conditions are required for mining protective layers, including coal seam spacing, coal seam occurrence, gas content, etc., that is to say, coal seams without outburst risk are mined first, so that ...

AI Technical Summary

Problems solved by technology

At present, our country has some measures to enhance the strength of coal body, such as the invention patent with the patent number CN201610005805.4, by opening three spatially interrelated drill holes on the coal wall, and then injecting grouting materials to strengthen the coal body. However, this method is used to prevent coal wall deviation and roof caving. It is only suitable for the coal reinforcement of the working face, and the gas permeability of the grouting material is poor, which makes it difficult for gas to penetrate the coal after the coal is consolidated. Therefore, although it can consolidate the coal body, it cannot solve the problem of drilling and injection holes

Images