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Ecological protective coal mining method by mineralizing and utilizing CO2 waste gas

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: 2021-11-09
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Ecological protective coal mining method by mineralizing and utilizing CO2 waste gas
  • Ecological protective coal mining method by mineralizing and utilizing CO2 waste gas
  • Ecological protective coal mining method by mineralizing and utilizing CO2 waste gas

Examples

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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 an ecological protective coal mining method by mineralizing and utilizing CO2 waste gas. The ecological protective coal mining method is suitable for underground coal mines. The ecological protective coal mining method comprises the following steps that filling mining critical key parameters required by stability of a stope mining overlying strata seepage isolation zone are determined, sealing walls are constructed at two ends of a mining space along with advancing of a working face to seal a mined area, then a CO2 mineralization filling material CFBF is poured into the sealed area to fill a goaf along with mining, and it is ensured that the goaf is supported after the filling CFBF is solidified; and the CFBF is prepared from gangue, fly ash and mine sewage in a mining area, and is supplemented with cement and an alkaline silicon-based additive, so that formation of a mining overburden seepage isolation zone is ensured, continuous CFBF filling can be carried out, and finally the replacement of CO2 and coal is realized. The operation is simple, the result is reliable, and the recovery rate of coal resources can be greatly improved on the premise of realizing CO2 mineralization and solid waste material treatment.

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 Applications(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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