Fine coal slurry sealing method

Abstract

The invention discloses a fine coal slurry hole sealing method. The method comprises the following steps: firstly, adding the following components in percentage by weight into a stirrer: 60 to 70 percent of fine coal power, 25 to 35 percent of cement and 4 to 6 percent of white emulsion, and then adding water for continuous stirring, so as to enable water and fine coal to be mixed according to the ratio of 0.3 to 05; then, using a grouting pump to transport and press fine coal slurry into a grouting opening of a grouting hole sealing device. According to the invention, the fine coal slurry is used for replacing cement slurry to seal holes, the coal slurry and a coal body are combined tightly, no shrinkage is achieved, and pollutions to the coal body can be avoided. The fine coal power is used as a hole sealing material, materials can be obtained from local sources, exploitation cost is lowered, the distribution is simple and convenient, and times of tests show that the hole sealing effect is very good. Too much residual of sundries such as cement, sandstone and the like after coal layer mining can be prevented, the mining purity is high, the mining efficiency is high, and the fine coal slurry hole sealing method is very suitable for promotion and implementation.

Description

technical field [0001] The invention relates to a hole sealing technology in the technical field of coal mines, in particular to a method for sealing holes with fine coal slurry. Background technique [0002] With the rapid development of the coal industry and the mechanization of coal mine production, the problem of dust damage in coal mine production is still severe. The incidence of pneumoconiosis among coal miners is relatively high, and coal dust explosions occur from time to time. Gas outburst is a serious natural disaster in coal mines. Seriously restrict the safe production of coal mines. The standard coal mining process needs to drain the gas from the coal seam first. Since the coal seam is buried deep underground and the pressure between the coal seams is high, it is necessary to insert a gas extraction pipe after the coal seam is drilled to extract the gas deep in the coal seam. The drainage pipe needs to be sealed during the gas extraction process. The tradition...

AI Technical Summary

Problems solved by technology

It takes a long time to seal holes with cement mortar and inject water, the sealing effect is not good, the ability to withstand air pressure is not strong, and it consumes a lot of materials and is inconvenient to operate

[0003] In addition, the joint between the cement slurry and the coal body is currently used tightly, the cement slurry will shrink slightly after solidification, the sealing effect is poor, and the coal body will be polluted, resulting in an increase in the ash content of the coal.

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