A kind of sealing agent for gas drainage and its preparation method

Abstract

The invention relates to a novel gas extraction hole sealing agent and a preparation method thereof. The novel gas extraction hole sealing agent consists of a hole sealing material and water, wherein the mass ratio of the hole sealing material to the water is 1:(0.35 to 0.8); the hole sealing material comprises the following components in percentage by weight: 25 percent to 45 percent of red mud, 5 percent to 15 percent of steel slag fine powder, 20 percent to 35 percent of calcium aluminate powder, 2 percent to 10 percent of desulphurization gypsum powder, 5 percent to 15 percent of carbide slag, 20 percent to 40 percent of fly ash, 2 percent to 5 percent of a filling compacting agent, 0.4 percent to 1.6 percent of a modifier and 0.2 percent to 1.2 percent of a pipeline conveying modifier. The material has a good expansion effect; the sealing effect and gas extraction efficiency are improved; the number of drilled holes is reduced. According to the invention, a mode of stimulating wastes by wastes is originally adopted, so that when potential activities of the fly ash, the red mud and the steel slag fine powder are sufficiently stimulated, the use volume of water required for mixing is reduced and production cost of the material is reduced; each technical index meets the requirements of the hole sealing material and the novel gas extraction hole sealing agent belongs to a pioneer product in the industry.

Description

technical field [0001] The invention belongs to the field of industrial and mining, and particularly relates to a gas drainage sealing agent and a preparation method. Background technique [0002] Gas is the primary technical problem encountered in the mining process. Underground coal seam gas drainage is an effective method for coal seam gas control. Drilling is the basic technical means of coal seam gas control. The quality of the material determines the quality of the extraction effect. As a sealing material for sealing, its quality is particularly important. [0003] At present, the sealing materials used in coal seams in my country are mostly polymer materials and cement mortar sealing materials. The former has low compressive strength after sealing, and is prone to deformation and shrinkage under the action of rock stress. It is toxic, flammable, and some materials meet Water fails, the sealing effect is poor, and the price is very high, and the cost of sealing holes i...

AI Technical Summary

Problems solved by technology

[0008] At the same time, some minerals such as tricalcium aluminate and tetracalcium aluminoferrite are also produced. Like Portland cement, dicalcium silicate, tricalcium aluminate, and tetracalcium aluminoferrite are all hydraulic gelling products, but in the present Some processes have poor utilization of the potential activity of red mud, and it is difficult to give full play to its activity effect

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