A method for preventing spontaneous combustion of coal seam in open-pit mining stop line

Abstract

The invention discloses a method for preventing spontaneous combustion of a coal seam of a stopping line of a strip mine. The method is suitable for preventing and treating a spontaneous combustion disaster of the stopping line of the strip mine. Firstly, leveling or sloping treatment is conducted on coal at the stopping line, a relatively gentle working surface is formed, and a mechanical method or an oriented blasting method is used for conducting stripping, so that loose coal and redundant float coal of an outcrop coal surface are removed; then a temperature sensing controlled release type coal spontaneous combustion chemical inhibitor is sprayed on the outcrop coal surface subjected to stripping; furthermore, a coal seam outcrop subjected to inhibitor treatment is filled and blocked with a high-water quick coagulating blocking material; afterward, the upper side of crop coal of the stopping line is covered with a finely ground coverage material, and the finely ground coverage material is flattened and compacted to form a material covering layer; and finally, the material covering layer is covered with soil, and soil conditions are provided for later afforestation and ecological restoration. The method can be used for effectively preventing the later spontaneous combustion disaster of the crop coal of the stopping line, provides a base for ecological restoration of a mine lot with closed pits, and has high practicality.

Description

technical field [0001] The invention relates to a method for preventing spontaneous combustion of a coal seam, in particular to a method for preventing spontaneous combustion of a coal seam on a stop mining line after the pit is closed in an open-pit coal mine, and belongs to the technical field of coal safety mining. Background technique [0002] The coal that is fully exposed to the atmosphere and the coal that has not been mined in time after blasting will oxidize and generate heat due to contact with the air. Under appropriate ventilation and heat storage conditions, the heat generated and accumulated by oxidation will cause the temperature of the coal to rise. temperature, eventually leading to spontaneous combustion of coal. [0003] Coal spontaneous combustion not only causes huge economic losses, but also seriously pollutes the environment, endangers the health of personnel, and even leads to major casualties. Coal spontaneous combustion has become one of the main na...

AI Technical Summary

Problems solved by technology

[0006] In recent years, with the increase of mining intensity, some open-pit coal mines have been converted to underground mining or closed pits. If the coal seam at the corresponding stop mining line is not properly treated, it is very easy to oxidize and self-heat in contact with oxygen, which will lead to coal Occurrence of spontaneous combustion disaster

[0007] At present, for open-pit coal mines that stop mining after the pit is closed, the outcrop coal seam is usually covered to isolate the air in order to prevent the coal seam spontaneous combustion disaster at the stop line. A main fire water supply line is set up for each step, and water is sent to each coal mining face with branch pipes. This traditional treatment method for outcrop coal seams has high requirements for covering thickness and a large amount of work, and usually exists in the later stage. Due to phenomena such as weathering, slope collapse, and natural cracks, the coal seam that was originally isolated from oxygen has a major safety hazard of recombination reaction with oxygen

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