Isolated fireproof filling material for roof falling area of underground coal mine

Abstract

The invention relates to an isolated fireproof filling material for a roof falling area of an underground coal mine. The isolated fireproof filling material is formed by uniformly mixing the following materials, by weight, 15-25% of hydrophobic expanded and vitrified small balls, 20-30% of ordinary Portland cement 42.5, 40-50% of water, 0.1-0.2% of a JW-I naphthalene retarded high range water reducing agent, 2.0-3.0% of a foaming agent aluminium powder, 3.0-4.0% of an accelerator sulphate aluminium cement, 0.3-0.6% of dispersible latex powder, 0.10-0.30% of hydroxypropyl methyl cellulose and 4-6% of red mud. The sum of weight percentage of the above ingredients is 100%. By the use of the filling material, weight of a filling body is reduced well, and the filling body has high temperature resistance and good plasticity. In addition, transport of a dry material is realized successfully, tube plugging is avoided, and the falling problem due to large weight is avoided. Meanwhile, disasters such as gas accumulation and gas spontaneous combustion and the like that easily happen in a high roof falling area can effectively be solved, and the problem that a high roof falling area is still in an unstable state and a new wider range of roof falling phenomenon might appear can be better solved.

Description

technical field [0001] The invention relates to an isolation fire-proof filling material for the high-risk area of ​​underground roadway and the roof-fall area of ​​the stope, in particular to an isolation fire-proof filling material for the down-fall area of ​​the coal mine. The roof-fall isolation fire-proof filling belongs to the isolated fire-proof filling technology of the high-rise area of ​​the underground roadway and the roof-fall area of ​​the stope. Background technique [0002] In the process of coal mining, in the coal seam coal roadway, stope or area affected by the structure, the roof of the roadway is not stable, and the roof is easy to fall, forming a high-risk area in the roadway and a roof-fall area in the stope. pose a safety hazard. The existence of roadway high-risk areas and stope roof-fall areas brings harm to coal mine safety production mainly in the following aspects: First, high-risk areas are prone to occur when the roadway roof is a soft coal sea...

AI Technical Summary

Problems solved by technology

[0004] In view of the above situation, in order to solve the defects of the prior art, the object of the present invention is to provide a kind of isolation fireproof filling material for the caving area of ​​the coal mine, which can effectively solve the problem of low filling efficiency, high risk of personnel safety and poor filling sealing effect in the prior art. , after filling, heat release and accumulation will cause spontaneous combustion, resulting in safety accidents, and the problem of high cost of filling materials