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Mineralization and Utilization of CO2 Exhaust Gas Ecological Protection Coal Mining Method

A coal mining method and protective technology, applied in the field of ecologically protective coal mining using CO2 waste gas in mineralization, to achieve the effect of preventing further development

Active Publication Date: 2022-05-17
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is currently no CO 2 Underground mineralization, can effectively bear the pressure of overburden rock, and control the filling material of surface subsidence

Method used

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  • Mineralization and Utilization of CO2 Exhaust Gas Ecological Protection Coal Mining Method
  • Mineralization and Utilization of CO2 Exhaust Gas Ecological Protection Coal Mining Method
  • Mineralization and Utilization of CO2 Exhaust Gas Ecological Protection Coal Mining Method

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Embodiment 1

[0083] Embodiment 1: This example takes a certain mine in Shanxi as an example. The average buried depth of the coal seam is about 220m. The average block length is 330m, the average width is about 160m, and the reserves are about 200,000 tons. There are shallow aquifer water layer and surface 21 water above the mining area. The coal seam to be mined is No. XV coal with an average thickness of 2.4m and a dip angle of 1°-2°. The immediate roof is limestone with an average thickness of 8.5m and a unidirectional compressive strength of 54.0-213.0MPa. Coal seam No. IX also exists above No. XV coal (the bedrock section about 20m away from the immediate top of the limestone, mainly containing sandy mudstone, limestone, fine sandstone, mudstone, etc., and the lithology as a whole is moderately hard). About 24m above the No. Ⅸ coal seam, there is an effective water-resisting layer composed of sandy mudstone and mudstone (the bedrock section with an interval of about 20m in the middl...

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Abstract

The invention discloses a mineralization utilization CO 2 The exhaust gas ecological protection coal mining method is suitable for underground coal mines. Determine the critical key parameters of filling mining required for the stability of the overburden seepage isolation zone in the stope. With the advancement of the working face, build airtight walls at both ends of the mining space to seal the mined area, and then pour CO2 into the closed area. 2 Mineralized filling material CFBF fills the goaf as it is mined, and ensures the support of the goaf after the filling CFBF solidifies; CFBF is prepared by using gangue, fly ash and mine sewage in the mining area, supplemented by cement and alkaline silicon-based additives , not only to ensure the formation of seepage isolation zone in mining overlying strata, but also to carry out continuous CFBF filling, and finally realize CO 2 Replacement with coal. The operation is simple, the result is reliable, and it can realize CO 2 Under the premise of mineralization and solid waste material treatment, the recovery rate of coal resources is greatly improved.

Description

technical field [0001] The invention relates to a coal mining method, in particular to a method for mineralization and utilization of CO used in underground coal mines. 2 Exhaust gas ecological protection coal mining method. Background technique [0002] In my country's primary energy consumption, coal consumption has always accounted for more than 60%, which has effectively promoted the rapid development of my country's economic society. For a long period of time in the future, the status of coal as the primary energy source in China will not change. However, the large-scale mining of coal has changed the stress environment of the surrounding rock in the stope, deformed and destroyed the overlying rock, caused the overlying rock to bend, deform, and collapse, and then caused surface subsidence, which not only endangered the mining activity itself, but also caused shallow water pollution. Ecological problems such as resource loss, dead vegetation, and land desertification....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F15/00E21F15/04E21C41/18E21B7/04E21B33/13C04B28/00C04B22/06C09K8/467
CPCE21F15/005E21F15/04E21C41/18E21B7/04E21B33/13C04B28/00C04B22/10C09K8/426C09K8/467C04B2111/00724C04B18/12C04B18/08C04B22/002C04B2103/0068
Inventor 马立强吴乙辉许玉军翟江涛王洋洋
Owner CHINA UNIV OF MINING & TECH
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