Method for increasing top-coal recovery rate in primary mining period of fully-mechanized caving face

A fully mechanized caving face and recovery rate technology, applied in ground mining, earthwork drilling, underground mining, etc., can solve the problems of imperfect top-coal caving technology and low top-coal recovery rate, and achieve operability, The effect of reducing safety hazards and increasing economic income

Active Publication Date: 2014-01-08
DATONG COAL MINE GRP
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method for increasing the recovery rate of the top coal during the initial mining of fully mechanized caving faces, so a

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  • Method for increasing top-coal recovery rate in primary mining period of fully-mechanized caving face
  • Method for increasing top-coal recovery rate in primary mining period of fully-mechanized caving face

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Embodiment Construction

[0024] In order to enable those skilled in the art to better understand the present invention, the present invention will be further clearly and completely described below in conjunction with the accompanying drawings.

[0025] Such as figure 1 , figure 2 As shown, a method of improving the top-coal recovery rate during the initial mining of fully mechanized caving face of the present invention comprises the following steps:

[0026] (1) Before the initial mining of the working face, construct a hydraulic fracturing process roadway e in the direction of the belt channel k in the middle of the high pumping roadway j at a distance of 25m from the cut eye g, and construct several groups of hydraulic fracturing process roadway e in the hydraulic fracturing process roadway e Drilling, each group is specifically divided into four drillings a, b, c and d in different directions, of which three drillings a, b, c are arranged in the roof rock layer, and the other drilling hole d is a...

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Abstract

The invention discloses a method for increasing a top-coal recovery rate in a primary mining period of a fully-mechanized caving face so as to overcome the defect of low top-coal recovery rate caused by the fact that an existing top-coal caving control technique in the primary mining period of a fully-mechanized caving face is imperfect. The method includes: before primary mining of the caving face, constructing a hydrofracture process tunnel in a high-drainage tunnel, constructing a plurality of groups of drilled holes in the hydrofracture process tunnel, and performing hydrofracture in each drilled hole, wherein each group is divided into four drilled holes in different directions, three of the drilled holes are disposed in a top cover, and the other drilled hole is disposed in top coal. Wedge slot cracks are formed in the top coal and a roof to perform hydrofracture, so that the top-coal recovery rate in primary mining is increased; the method is simple in process, operable, low in cost and high in benefit, the top-coal recovery rate is increased, potential safety hazards are lowered, and accordingly safe and efficient production of coal mines is realized.

Description

[0001] technical field [0002] The invention relates to a method for recovering coal resources and improving the recovery rate, in particular to a method for improving the recovery rate of top coal during the initial mining of a fully mechanized caving face. Background technique [0003] At present, many mining areas in my country have the occurrence characteristics of extra-thick coal seams. In view of this feature, the mining technology of extra-thick coal seam fully mechanized caving mining is adopted. Caving and low top-coal recovery during initial mining have always been a technical problem in the world's mining industry, especially in the "two hard" extra-thick coal seams (above 18m) with a roof strength of 100MPa and a coal seam strength of more than 30MPa. It is basically difficult for the top coal to collapse within the range, resulting in a low recovery rate of the top coal, which not only wastes a lot of coal resources, but also increases the risk of coal mines due...

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Application Information

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IPC IPC(8): E21C41/16
Inventor 于斌匡铁军段宏飞刘锦荣
Owner DATONG COAL MINE GRP
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