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Foaming reinforced filling material for coal mine and preparation method thereof

A filling material and foaming technology, which is applied in the field of foaming materials, can solve the problems of difficulty in using inorganic reinforcement materials, small crack width, and unusability, etc., so as to improve the coal recovery rate, meet the safety of use, and increase the foaming ratio. tune effect

Pending Publication Date: 2020-10-27
INNER MONGOLIA BORAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] 5. Although there are fissures formed in the underground broken coal and rock mass due to the original or mining impact, the width of the fissures is small, so it is difficult to use inorganic reinforcement materials
Hydrogen peroxide is also hydrogen peroxide. Its aqueous solution is a colorless transparent liquid. It is a strong oxidant. It is used in underground coal mines, which is very dangerous and inconvenient to transport, so it cannot be used in underground coal mines.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Weigh 500g of sulfoaluminate cement, 370g of fly ash, 8g of calcium stearate, 2g of naphthalenesulfonate formaldehyde polymer, 0.5g of lithium carbonate, 5g of manganese dioxide, and 35g of sodium percarbonate in a powder mixer Mix well and evenly, and prepare the foaming reinforcement filling material for coal mines.

[0042] The above-prepared materials were placed in a stirring tank with a paddle stirrer added with 370 g of water in advance, stirred for 2 minutes to mix evenly, and poured into a mold for foaming and forming.

[0043] It was observed that the material lost fluidity after 4 minutes and solidified after 20 minutes. The finally obtained molded parts do not collapse or crack, and the foaming ratio is 8 times. Using GB / T 17671-1999 cement mortar strength test method (ISO method) to test the compressive strength of the molded parts is 0.8Mpa.

Embodiment 2

[0045] Weigh 500g of sulfoaluminate cement, 8g of quicklime, 300g of ordinary Portland cement, 8g of calcium stearate, 1.9g of naphthalenesulfonate formaldehyde polymer, 0.6g of lithium carbonate, 1g of PVA17-88, and 7.7g of manganese dioxide 1. 20 g of sodium percarbonate was fully mixed in a powder mixer to prepare a foaming reinforcement filling material for coal mines.

[0046]Put the above-prepared material in a mixing tank with a paddle stirrer added with 300g of water in advance, stir for 2 minutes to mix evenly, pour it into a mold for foaming, foaming starts after 10 minutes, and starts to solidify after 20 minutes.

[0047] The molded parts do not collapse or crack, the foaming ratio is 4 times, and the compressive strength is 1.5Mpa.

Embodiment 3

[0049] Weigh 500g of sulfoaluminate cement, 5.7g of quicklime, 150g of ordinary Portland cement, 150g of fly ash, 8g of calcium stearate, 1.5g of naphthalenesulfonate formaldehyde polymer, 0.5g of lithium carbonate, and 1g of PVA17-88 , 7.5 g of manganese dioxide, and 30 g of sodium percarbonate were fully mixed in a powder mixer to prepare a foaming reinforcement filling material for coal mines.

[0050] Put the above-prepared material in a mixing tank with a paddle stirrer added with 300g of water in advance, stir for 2 minutes to mix evenly, pour it into a mold for foaming, foaming starts after 8 minutes, and starts to solidify after 20 minutes.

[0051] The molded parts do not collapse or crack, the foaming ratio is 1.5 times, and the compressive strength is 5.5Mpa.

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Abstract

The invention relates to a foaming reinforcing filling material for a coal mine. The foaming reinforcing filling material is prepared by mixing the following raw materials in percentage by weight: 50-60% of a quick cementing material, 35-45% of an admixture, 0.1-0.25% of a concrete admixture, 0.3-1% of a stearate foam stabilizer, 1-5% of an inorganic foaming agent and 0.5-1% of a foaming activator. After water is added into the filling material, the filling material is used for goaf backfilling and underground caving goaf filling, normal-temperature foaming and curing of the filling material can be achieved, a cured body is high in strength and has certain bonding strength, and the filling material is used for coal mine safety production and goaf treatment and can provide guarantee for mine safety and efficient production.

Description

technical field [0001] The invention relates to a foamed cement reinforcement filling material, more specifically, relates to a foaming material used for bonding, strengthening and filling coal (rock) bodies in coal mines and related industries. Background technique [0002] Goaf refers to the hollow area left after the mining of underground solid deposits such as coal mines, and the deformation and destruction of the surface caused by the instability of the surrounding rocks, displacement, cracking, crushing and collapse, until the overall subsidence and bending of the overlying rock strata area or range. Surface subsidence in the gob area produces continuous or discontinuous deformation, which can bring a series of environmental geotechnical engineering problems, such as water accumulation in flat ground, road cracks, house collapse, reduction of cultivated land, and reduction of farmland production. As one of the potential geological disasters caused by human activities,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/06
CPCC04B28/06C04B2201/50C04B18/08C04B22/10C04B22/068C04B24/226C04B22/06C04B22/00C04B22/064C04B24/08C04B24/2623
Inventor 陈守东侯凤杨月华许献文
Owner INNER MONGOLIA BORAN TECH CO LTD
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