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Fire-prevention and leaking-stoppage thickened pulverized fuel ash slurry of goaf and preparation method thereof

A technology for fly ash and goaf is applied in the field of fire prevention, plugging, and thickening fly ash slurry and preparation in goaf, which can solve the problem of easy occurrence of water accumulation in transportation roads, wear of working area of ​​pipelines, and unsatisfactory fire prevention effect. problems, to achieve the effect of improving the fire-fighting effect, reducing pipeline wear, and good leak-stopping effect.

Inactive Publication Date: 2010-06-09
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the simple fly ash grouting facilities, low cost, and easy slurrying, many coal mines use fly ash grouting to prevent coal spontaneous combustion, but the water and ash in the fly ash slurry are easy to separate, and it is easy to block the pipeline and cause serious wear and tear on the pipeline. And problems such as serious water in the working area have always plagued its application
[0005] (1) Although the gray-water ratio is very low, the fly ash particles are still easy to block the pipeline, and the pipeline wears a lot;
[0006] (2) The pipeline is severely worn;
[0007] (3) The slurry concentration is low, and the fire prevention effect is not ideal;
[0008] (4) The amount of water used for fly ash grouting at present is large, and the transportation path of the working face is prone to water accumulation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1, water 80%, fly ash 18%, superabsorbent resin, acetylated distarch sodium or hydroxypropyl methylcellulose thickener 1.8%, polyvinyl alcohol, sodium tripolyphosphate or hexameta Sodium phosphate dispersant 0.2%;

[0015] The above-mentioned substances can be used after mixing evenly according to the mass percentage. The specific preparation method is as follows:

[0016] Inject 80% of water into the on-site grouting pool, and then inject 18% of fly ash into the grouting pool. After stirring and mixing, add 1.8% of superabsorbent resin and acetylated distarch sodium Or hydroxypropyl methylcellulose thickener, polyvinyl alcohol with a mass percentage of 0.2%, sodium tripolyphosphate or sodium hexametaphosphate dispersant, fully stirred evenly to make thickened fly ash slurry.

Embodiment 2

[0017] Embodiment two, water 75%, fly ash 21.4%, superabsorbent resin, acetylated distarch sodium or hydroxypropyl methylcellulose thickener 0.6%, polyvinyl alcohol, sodium tripolyphosphate or hexameta Sodium phosphate dispersant 3%;

[0018] The above-mentioned substances can be used after mixing evenly according to the mass percentage. The specific preparation method is as follows:

[0019] Inject 75% water into the grouting tank, then inject 21.4% fly ash into the grouting tank, and after mixing, add 0.6% superabsorbent resin, acetylated distarch sodium or Hydroxypropyl methylcellulose thickener, polyvinyl alcohol with a mass percentage of 3%, sodium tripolyphosphate or sodium hexametaphosphate dispersant, fully stirred evenly to make thickened fly ash slurry.

Embodiment 3

[0020] Embodiment three, water 70%, fly ash 25%, superabsorbent resin, acetylated distarch sodium or hydroxypropyl methylcellulose thickener 4%, polyvinyl alcohol, sodium tripolyphosphate or hexameta Sodium phosphate dispersant 1%;

[0021] Inject 70% water by mass into the on-site grouting pool, and then inject 25% fly ash by mass, and after stirring and mixing, add superabsorbent resin, acetylated distarch sodium 2-acid, 4% by mass Or hydroxypropyl methylcellulose thickener, polyvinyl alcohol with a mass percentage of 1%, sodium tripolyphosphate or sodium hexametaphosphate dispersant, fully stirred evenly to make a thickened fly ash slurry.

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Abstract

The invention relates to fire-prevention and leaking-stoppage thickened pulverized fuel ash slurry of a goaf and a preparation method thereof. The thickened pulverized fuel ash slurry is prepared by uniformly mixing 70 to 80 water, 18 to 25 pulverized fuel ash, 0.6 to 4 thickening agents and 0.2 to 3 dispersing agents in percentage by mass, wherein the thickening agents can adopt super absorbent resins, acetylized diacid dual sodium starch or hydroxypropyl methyl cellulose, and the dispersing agents can adopt polyvinyl alcohol, sodium tripolyphosphate or sodium hexametaphosphate. The slurry overcomes the defects of easy water and ash separation, easy pipeline blockage, serious pipeline abrasion, serious water accumulation of a working face and the like of the common pulverized fuel ash slurry, the thickening agents are added in the pulverized fuel ash slurry to slow down the sedimentation of the particles of the pulverized fuel ash, prevent a pipe from being blocked and reduce the pipeline abrasion, and the concentration, the water retaining performance and the fire-preventing effect of the slurry can be enhanced. Besides, the thickened pulverized fuel ash slurry is filled along with mining at the implementation goaf of a side-buried pipe of a return airway, and has the effect of favorable leaking stoppage.

Description

technical field [0001] The invention relates to a fireproof plugging slurry and a preparation method thereof, in particular to a goaf fireproof plugging thickened fly ash slurry and a preparation method suitable for coal spontaneous combustion in underground coal mines and gas gushing out to the working face. Background technique [0002] Coal spontaneous combustion is one of the main natural disasters in mines in my country. In my country's key state-owned coal mines, fires caused by coal spontaneous combustion account for about 90% of the total number of mine fires. There are still large-scale coalfield fires in Xinjiang, Ningxia, Inner Mongolia and other provinces in my country, and the amount of coal burned is 10 to 13.6 million tons per year. , the economic loss exceeds 20 billion yuan, and coal spontaneous combustion also produces a large amount of SO 2 , CO, CO 2 gas, seriously polluting the environment and causing casualties. To this end, coal mine safety regulatio...

Claims

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Application Information

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IPC IPC(8): C04B28/08
Inventor 林柏泉李增华朱传杰王力赫永恒江丙友
Owner CHINA UNIV OF MINING & TECH
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