Solid waste coal gangue disposal grouting and sedimentation reduction method

Abstract

The invention provides a solid waste coal gangue disposal grouting and sedimentation reduction method. The method comprises the following steps that S1, coal gangue is cleaned, wherein a selected and accumulated coal gangue pile is washed through cleaning equipment, dirt and impurities on the surface of the coal gangue are cleaned, and impurities on the surface of the coal gangue are removed; S2, coal gangue slurry is prepared and treated, wherein the solid waste coal gangue is crushed through a crusher, then the crushed coal gangue is ground through a grinding machine, and qualified coal gangue powder is screened out through a filter screen after grinding. According to the solid waste coal gangue disposal grouting and sedimentation reduction method, when the coal gangue slurry is prepared, the coal gangue is selected and cleaned in advance, then the treated coal gangue is crushed and ground, the quality of the subsequently prepared coal gangue slurry is improved, impurities in the prepared coal gangue slurry are reduced, the fluidity of the slurry is improved, the grouting and filling effect of a separation layer zone is improved, the waste of the slurry is reduced, the grouting quality is improved, and subsequent treatment is facilitated.

Description

technical field [0001] The invention relates to the technical field of grouting filling coal mining method with abscission zone, in particular to a grouting and sinking reduction method for solid waste coal gangue disposal. Background technique [0002] The effect and economic rationality of grouting filling in the separation zone are also related to factors such as the depth of the borehole, the time of drilling, the distance between the boreholes, the fluidity of the mortar, and the grouting capacity of the borehole. Drill holes in the empty area, and timely carry out high-pressure grouting to the rock formations in the separation zone, so that the slurry can fill the separation space between the formations, which can reduce the settlement rate of the formation in the separation zone, thereby reducing the surface subsidence and Deformation is conducive to the "three downs" coal mining, the method is called abscission zone grouting filling coal mining method. [0003] Afte...

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Problems solved by technology

[0004] In the actual technology, solid waste coal gangue slurry needs to be manually injected into the separation layer space in the process of overlying rock failure to fill the separation layer space, so as to prevent the further damage of the overlying rock at the grouting layer and slow down the movement of the overlying rock. The speed of propagation to the upper surface controls the movement of rock strata and finally achieves the purpose of reducing surface subsidence. However, there are certain shortcomings in the existing solid waste coal gangue disposal steps, such as when the existing solid waste coal gangue is prepared into slurry , most of the solid waste coal gangue is crushed and ground directly, and the solid waste coal gangue is not cleaned and selected, which leads to more impurities in the prepared coal gangue slurry, which affects the fluidity of the slurry, thereby reducing the separation zone. The effect of filling causes the waste of grout, and reduces the quality of grouting, which is not conducive to the subsequent processing, and seriously increases the labor intensity of the staff

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