Method for reducing silt coal slime in underground water sump of large water coal mine

Abstract

The invention discloses a method for reducing silt coal slime in an underground water sump of a large water coal mine. The method comprises the steps as follows: firstly, before working face mining, a water draining roadway is arranged in a position lower than the elevation of a transport belt roadway, through holes are formed in the transport belt roadway at intervals, and the transport belt roadway is communicated with the water draining roadway through the through holes; a vibrating sieve is mounted at the tail end of the water draining roadway and a coal transporting roadway is arranged behind the vibrating sieve; transport equipment is arranged in the coal transporting roadway; two water storage deposition pools are arranged on one side of the water draining roadway and water inlet gates are arranged at the inlets of the water storage deposition pools; the water storage deposition pools are communicated with the underground water sump; when mining, a water coal body is discharged into the water draining roadway from the through holes and filtered by the vibrating sieve, and filtered coal is transported to an underground coal bunker; and coal slime water after filtering is deposited by the water storage deposition pools so as to achieve coal-water separation. According to the method, the coal slime water is purified in advance before entering into the underground water sump, so that the silt amount of the underground water sump is reduced and the water-holding capacity of the water sump is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of coal mining. Background technique [0002] In the field of coal mining technology, mines with a daily water inflow of more than 10,000 tons or more than twice the normal daily water inflow are called Dashui mines, or Dashui coal mines. [0003] The coal reserves threatened by water in my country's key coal mines are about 25 billion tons, of which the coal reserves threatened by surface water bodies (rivers, rivers, lakes, seas, etc.), loose aquifers, and bedrock aquifers are nearly 10 billion tons. In terms of the influence of rivers alone, more than 200 mines are threatened by more than 100 large and small rivers, and coal fields in North China, East China, and Northeast China are generally covered by Quaternary and Tertiary unconsolidated aquifers. In coal mining, especially in mining with a large mining height (more than 5 meters), it is easy to cause the height of the water-conducting fracture zone ...

AI Technical Summary

Problems solved by technology

With the increase of silt coal, part of the silt coal will be brought into the suction port of the main water pump by the water flow, seriously affecting the drainage capacity of the pump

For this reason, in the past, coal mine bottom water tanks had to be regularly cleaned of silted coal, especially for mines with inclined mining, due to the high concentration of water and coal, the water tank will soon be filled with silted coal, and the work of clearing the water tank The cycle is very short, which will inevitably increase the labor intensity of miners, reduce the efficiency of coal production, and seriously affect the ability of coal mines to resist floods

[0004] In order to reduce coal silt, some sieves are set up underground to separate coal from water, but the filtered water still contains a large amount of fine powder, which becomes coal slime water and enters the water tank at the bottom of the well, and a large amount of silt is deposited in the water tank at the bottom of the well. The silo will soon be filled with silt, affecting the drainage capacity of the main water pump. The work of dredging silt will increase the labor intensity of the miners and seriously affect the water storage capacity of the water silo.

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