Inorganic filling material

Abstract

The invention discloses an inorganic filling material which comprises materials A and materials B, wherein the materials A comprise the following components in parts by mass: 70 to 80 parts of bauxite powder, 1 to 2 parts of calcium formate, 15 to 20 parts of aluminum oxide, 2 to 5 parts of gypsum, 15 to 20 parts of coal ash and 2 to 5 parts of calcium powder, and the materials B comprise the following components in parts by mass: 30 to 40 parts of gypsum, 20 to 25 parts of lime, 1 to 2 parts of compound accelerator, 0.1 to 1 part of water reducing agent, 1 to 5 parts of expanding agent, 0.1 to 1 part of lauryl sodium sulfate, 1 to 5 parts of polyolefin and 0.1 to 1 part of alkali lignin. The filling material makes close contact with the periphery of a roadway, so as to form a sealed body with good integrality, the integrality is strong, the compressive property is good, a filling body has expansibility, and downhole safe conditions are improved; no combustion or combustion supporting exists, obvious explosion-proof and anti-static properties are achieved, and the gas sealing and fire preventing and extinguishing effects are good; the filling rate is high, a top plate is easy to control, and the top plate in a gob can be effectively controlled, so as to limit depression of the ground.

Description

technical field [0001] The invention relates to an inorganic filling material, which is mainly used for filling and compacting coal mine goafs, high-level drilling sites, empty tunnels and abandoned shaft lanes. Background technique [0002] With the continuous increase of coal mining depth, the gas content in coal mines continues to increase. In order to prevent gas accumulation and coal spontaneous combustion, it is necessary to close the gobs and abandoned shafts in underground coal mines. In recent years, due to the application of various gas drainage methods in coal mines, various drainage drilling sites have been formed. The completed drilling projects or the scrapped drainage drilling sites are likely to cause gas accumulation and increase the difficulty of roof management. In order to prevent spontaneous combustion of coal seams or the hazards of toxic gas diffusion to safe production, it is usually necessary to fill and plug leaks in coal mine underground working fa...

AI Technical Summary

Problems solved by technology

Among them, filling with cement slurry will reduce the volume due to the solidification of cement slurry, and the solidification is slow and easy to separate water, which is prone to insufficient and dense filling in the filling area; the effect of injecting organic foam material is good, but it is easy to generate heat, the material itself is flammable, and the price is relatively high. High, high processing cost, which increases the input and cost of the enterprise; hydraulic filling materials are transported by pipeline, which limits the maximum particle size of the filling material, which easily leads to pipeline blockage, and the operation process is complicated, the work intensity is high and the cost is high

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