High-water filling material for underground coal mine and preparation method and device of filling material

A technology for filling materials and preparation devices, which is applied in the field of materials used in underground coal mines. It can solve problems such as failure to take environmental protection measures, low filling strength, and polluted mine water, and achieve the effect of realizing solid waste recycling, low cost, and low cost.

Inactive Publication Date: 2019-07-05
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the high-water filling materials use sulfate cement and gypsum as cementing materials, and industrial waste such as fly ash as aggregates. The prepared filling materials have a large volume of water content and save aggregates, but the filling strength is low and the cost is high.
Moreover, the existing filling materials are likely to cause the risk of polluting mine water during operation, and corresponding environmental protection measures have not been taken

Method used

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  • High-water filling material for underground coal mine and preparation method and device of filling material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Add 200 kg of high-calcium fly ash and 10 kg of admixture to 200 kg of water, stir evenly, and after standing for 8 hours, add 80 kg of cement and 600 kg of coal gasification slag, and mix evenly to obtain filling materials that can be used in underground coal mines.

[0037] It will be tested that the compressive strength of the material is 10Mpa, without cracking and fragmentation; the volume moisture content is 70%; the dimethyl blue adsorption rate is 2%.

Embodiment 2

[0039] Add 600 kg of high-calcium fly ash and 20 kg of admixture to 450 kg of water, stir evenly, and after standing for 24 hours, add 180 kg of cement and 750 kg of coal gasification slag, and mix well to obtain materials that can be used for filling coal mines.

[0040] The measured compressive strength of the material is 12Mpa, without cracking and fragmentation; the volume moisture content is 75%; the dimethyl blue adsorption rate is 3%.

Embodiment 3

[0042] Add 800 kg of high-calcium fly ash and 30 kg of admixture to 700 kg of water, stir evenly, and after standing for 48 hours, add 220 kg of cement and 1,200 kg of coal gasification slag, and mix evenly to obtain materials that can be used for filling coal mines.

[0043] The measured compressive strength of the material is 11Mpa, without cracking and fragmentation; the volume moisture content is 77%; the dimethyl blue adsorption rate is 73%.

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Abstract

The invention discloses a high-water filling material for underground coal mine, and a preparation method and device of the filling material. The filling material of the present invention is preparedfrom high-calcium fly ash, coal gasification slag, cement, water and an admixture. The preparation method of the invention comprises the steps of first adding high-calcium fly ash to water, adding theadmixture, and conducting uniform stirring and then conducting standing for 8 to 48 hours; then, adding coal gasification slag and cement, and conducting even mixing. The device of the present invention comprises: a high-calcium fly ash pretreatment tank, a cement material tank, a coal gasification slag conveyor, a stirrer and a conveying pipe. According to the invention, the high-calcium fly ashwhich cannot be used in conventional civil engineering materials is used, and the problem of poor stability of the high-calcium fly ash is solved. After full hydration digestion of the high-calcium fly ash, the high-calcium fly ash contains a large amount of combined water, high-water-content coal gasification slag and ordinary Portland cement form the high-water filling material, thus waste is turned into treasure, the cost is low, and the high-cost problem of the filling material caused by using sulphoaluminate cement is avoided.

Description

technical field [0001] The invention relates to a material for underground coal mines, in particular to a high-water filling material for underground coal mines, a preparation method and a device thereof. Background technique [0002] With the rapid development of the national economic construction, the society's demand for coal resources is increasing. While coal enterprises are continuously increasing coal production, the "three-down" coal pressing has caused tight working faces in mining areas and shortened service life of mines. At the same time, a series of problems such as land subsidence, house damage, and ecological environment pollution caused by large-scale mining have also become bottlenecks restricting the sustainable development of mining areas. To solve a series of problems caused by overlying rock movement and surface subsidence caused by coal mining, the most critical technology is to effectively fill the goaf. [0003] The filling materials in the existing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00
CPCC04B28/00C04B2111/00724C04B18/08C04B18/065C04B2103/302C04B2103/14
Inventor 赵鹏
Owner CHANGAN UNIV
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