AU2014253466B2 - Inorganic cured foam material for surface leaking stoppage in shallow buried coal seam mining area and preparation method of the same - Google Patents

Inorganic cured foam material for surface leaking stoppage in shallow buried coal seam mining area and preparation method of the same Download PDF

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AU2014253466B2
AU2014253466B2 AU2014253466A AU2014253466A AU2014253466B2 AU 2014253466 B2 AU2014253466 B2 AU 2014253466B2 AU 2014253466 A AU2014253466 A AU 2014253466A AU 2014253466 A AU2014253466 A AU 2014253466A AU 2014253466 B2 AU2014253466 B2 AU 2014253466B2
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foam material
cured foam
inorganic cured
inorganic
coal ash
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AU2014253466A1 (en
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Yuwei Jia
Lei Li
Yi Lu
Botao Qin
Leilin Zhang
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China University of Mining and Technology CUMT
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China University of Mining and Technology CUMT
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/34—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing cold phosphate binders
    • C04B28/342—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing cold phosphate binders the phosphate binder being present in the starting composition as a mixture of free acid and one or more reactive oxides
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Sealing Material Composition (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)

Abstract

Abstract The invention discloses an inorganic cured foam material for surface leaking stoppage in a shallow buried coal seam mining area and a method for preparation of the inorganic cured foam material, which belong to an inorganic cured foam material and a method for preparation of the inorganic cured foam material. The leaking-stoppage cured foam comprises: water, coal ash, slaked lime, cement, ox horn powder, aluminum powder, copper oxide, polyphosphoric acid, aluminum hydroxide, hydroxypropyl methyl cellulose and steel fiber. The method for preparation of the inorganic cured foam material comprises the following steps: firstly, adding the coal ash, cement, hydroxypropyl methyl cellulose, steel fiber and slaked lime into water to form a coal ash substrate slurry; secondly, adding the ox horn powder into a small amount of water and stirring to form a prefabricated viscous liquid, and stirring sufficiently the coal ash substrate slurry and the prefabricated viscous liquid to form a mixed solution; thirdly, adding an inorganic adhesive system into the mixed solution and stirring sufficiently to form a mixed adhesive solution; and finally, adding the aluminum powder and stirring sufficiently to a homogeneous state, foaming the slurry by utilizing an organic self-foaming system, to prepare the inorganic cured foam material for surface leaking stoppage in a shallow buried coal seam mining area. According to the invention, the fracture infiltration capability is strong, the compressive strength is high, the high-temperature resistance and the heat insulation performance are good, and the substrate is purely inorganic and pollution-free.

Description

I Inorganic Cured Foam Material for Surface Leaking Stoppage in Shallow Buried Coal Seam Mining Area and Preparation Method of the Same Field of the Invention The present invention relates to an inorganic cured foam material and a method for preparation of the inorganic cured foam material, in particular to an inorganic cured foam material for surface leaking stoppage in a shallow buried coal seam mining area and a method for preparation of the inorganic cured foam material. Background of the Invention The spontaneous combustion of coal is one of the top hazards confronted in the safe production of coal mines in China, and severely endangers the safety of underground workers and the normal mining work at mining faces, and may result in severe economic losses. In recent years, the focus on energy strategy in China shifted westward. The shallow buried coal seams in the mining areas in western China have a tendency of spontaneous combustion, the buried depth is shallow (usually 30-250 meters), and air leakage from the surface fractures is severe, causing more and more frequent spontaneous combustion of coal, To efficiently prevent and control air leakage from the surface fractures, carrying out fracture sealing to isolate oxygen from the residual coals in the mined-out areas on the basis of the obtained law of air leakage from the fractures is one of the most effective measures for preventing fire disasters in coal mines. To effectively prevent and control spontaneous combustion of coal incurred by air leakage from the surface fractures, large-area surface backfilling, injection of slurry, injection of gel, polyurethane foam, light-weight paste material, or high-performance water sealing material, etc., are usually used in China. However, all these techniques have drawbacks: large-area surface backfilling can only fill up obvious wide fractures preliminarily, and is highly labor and material consuming; in the serous liquid injection process, the serous liquid may leak along the fractures to the underground mining face and roadways, and the effect is very poor; ammonium salt gels decompose at normal temperature and produce ammonia gas, which severely pollutes the environment in the mining area; polymer gels have a high cost and may crack easily; polyurethane foam materials tend to flame at high temperature and have a high cost; light-weight paste materials have unsatisfactory compression strength and produce small cracks easily; although high-performance water sealing materials have a high penetrating property and can penetrate into the clearances in the coal body, they have unsatisfactory compression strength, and the organic components in them have poor thermal stability. Summary of the Invention In view of the drawbacks in the existing techniques for sealing surface fracture air leakage in shallow buried coal seam mining areas, the present invention provides an inorganic cured foam material for surface leaking stoppage in a shallow buried coal seam mining area, which has a foaming factor of 7 to 10 times, can penetrate into small fractures quickly, has a good air leakage sealing effect, has adjustable curing
I
2 time, high compression strength after curing, high temperature resistance, and good thermal insulation performance, and the substrate material is purely inorganic and pollution-free; in addition, the present invention also provides a method for preparation of the inorganic cured foam material. The technical solution of the present invention comprises an inorganic cured foam material and a method for preparation of the inorganic cured foam material; the inorganic cured foam material comprises the following components and parts by weight (pbw): water: 40-60pbw, coal ash: 100pbw, slaked lime: 5pbw, cement: 20pbw, ox horn powder: 0.15-0.3pbw, aluminum powder: 4pbw, copper oxide: 1-3.5pbw, polyphosphoric acid: 0.4-1.4pbw, aluminum hydroxide: 0.04-0.1pbw, hydroxypropyl methyl cellulose: 0.8-1.2pbw, and steel fiber: 3pbw; the copper oxide is in 300 mesh size. The viscous liquid formed by the ox horn powder can reduce the surface tension of the slurry, distribute the solid particles in the serous liquid uniformly, and improve the stability of foams; the aluminum powder and slaked lime have a chemical reaction and generate a gas, and they constitute a gas self-generation system for the slurry; the copper oxide, polyphosphoric acid, and aluminum hydroxide constitute an inorganic adhesive system, and the curing time is adjustable by adjusting the ratio of the three components; the manufacturing process is as follows: Step 1: add 35-55pbw water, 100pbw coal ash, 20pbw cement, 0.8-1.2pbw hydroxypropyl methyl cellulose, 3pbw steel fiber, and 5pbw slaked lime into a special mixing vessel A, and stir with a stirrer at 5,000+200rpm for 2 minutes, to form a coal ash substrate slurry; Step 2: add 5pbw water and 0.15-0.3pbw ox horn powder into a special mixing vessel B, and stir with a stirrer at 10,000+500rpm for 3 minutes, to form a viscous liquid; Step 3: add the viscous liquid of ox horn powder in the special mixing vessel B into the coal ash substrate slurry in the special mixing vessel A, and stir with a stirrer in the special mixing vessel A at 12,000+500rpm for 3minutes, to form a mixed solution; Step 4: add a mixture prepared from 1-3.5pbw copper oxide, 0.4-1.4pbw polyphosphoric acid, and 0.04-0.lpbw aluminum hydroxide into the mixed solution, and stir with a stirrer at 5,000+200rpm for 5 minutes, to form a mixed adhesive solution; Step 5: add 4pbw aluminum powder into the mixed adhesive solution, and stir with a stirrer at 12,000+500rpm for 3 minutes, to prepare the inorganic cured foam material for surface fracture sealing in coal mines. Beneficial effects: with the technical solution described above, the viscous liquid of the invention formed by ox horn powder and water can distribute the solid particles uniformly in the coal ash substrate slurry, improve the stability of the foams, and increase the foaming efficiency of hydrogen; the copper oxide, polyphosphoric acid, 2 3 and aluminum hydroxide react and form an inorganic adhesive system, and the curing time of the solution can be adjusted within 15 minutes to 2 hours at the room temperature by adjusting the ratio of the three components; finally, the aluminum powder and slaked lime (calcium hydroxide) aqueous solution react and generate hydrogen, and serve as a self-reacting air-entraining agent of the slurry. The hydroxypropyl methyl cellulose can thicken the slurry in the early stage and is helpful for seepage of the foam fluid in small fractures, and can increase the toughness of the cured foams after the foam fluid is cured; the steel fibers are evenly distributed on the cell walls after the cured foams are formed, and serve as the skeletons of cell walls after being cured and connect the foams together, and thereby improve the compression strength of the cured foams; the cement can accelerate the hydration reaction of the coal ash, and it serves as an activating agent to accelerate the curing of the coal ash. The inorganic cured foam fluid material according to the present invention does not require any external gas source, but only utilizes the gas produced in the chemical reaction between aluminum powder and slaked lime as the gas source; therefore, the process flow is simply; the foam fluid has high penetrating performance, adjustable curing time, and excellent air leakage sealing effect; the foaming factor is great, the compression strength is high, the high-temperature resistance and heat insulation performance are good, and the price is low; the method is widely applicable in the domain of surface fracture sealing in burning areas in coal fields and coal mines. Detailed Description of the Embodiments Embodiment 1: firstly, add 35pbw water, 100pbw coal ash, 20pbw cement, 0.8pbw hydroxypropyl methyl cellulose, 3pbw steel fiber, and 5pbw slaked lime into a special mixing vessel A, and stir with a stirrer at 5,000+200rpm for 2minutes, to form a coal ash substrate slurry; secondly, add 5pbw water and 0. 15pbw ox horn powder into a special mixing vessel B, and stir with a stirrer at 10,000+500rpm for 3minutes, to form a viscous liquid; thirdly, add the viscous liquid of ox horn powder in the special mixing vessel B into the coal ash substrate slurry in the special mixing vessel A, and stir with a stirrer in the special mixing vessel A at 12,000+500rpm for 3minutes, to form a mixed solution; fourthly, add a mixture prepared from 1pbw copper oxide (in 300 mesh size), 0.4pbw polyphosphoric acid, and 0.04pbw aluminum hydroxide into the mixed solution, and stir with a stirrer at 5,000+200rpm for minutes, to form a mixed adhesive solution; finally, add 4pbw aluminum powder into the mixed adhesive solution, and stir with a stirrer at 12,000+500rpm for 3minutes, to prepare the inorganic cured foam fluid material for surface fracture sealing in coal mines. Inject the prepared inorganic cured foam liquid with a 2MPa ground mobile injection pump through a conveying pipeline into surface fractures to be sealed, to reduce and control air leakage, so as to prevent spontaneous combustion of the coal. Embodiment 2: firstly, add 50pbw water, 100pbw coal ash, 20pbw cement, 1.Opbw hydroxypropyl methyl cellulose, 3pbw steel fiber, and 5pbw slaked lime into a special mixing vessel A, and stir with a stirrer at 5,000+200rpm for 2minutes, to form a coal ash substrate slurry; secondly, add 5pbw water and 0.25pbw ox horn powder into a 3 4 special mixing vessel B, and stir with a stirrer at 10,000+500rpm for 3minutes, to form a viscous liquid; thirdly, add the viscous liquid of ox horn powder in the special mixing vessel B into the coal ash substrate slurry in the special mixing vessel A, and stir with a stirrer in the special mixing vessel A at 12,000+500rpm for 3minutes, to form a mixed solution; fourthly, add a mixture prepared from 2pbw copper oxide (in 300 mesh size), 0.8pbw polyphosphoric acid, and 0.08pbw aluminum hydroxide into the mixed solution, and stir with a stirrer at 5,000+200rpm for 5minutes, to form a mixed adhesive solution; finally, add 4pbw aluminum powder into the mixed adhesive solution, and stir with a stirrer at 12,000+500rpm for 3minutes, to prepare the inorganic cured foam fluid material for surface fracture sealing in coal mines. Inject the prepared inorganic cured foam liquid with a 2MPa ground mobile injection pump through a conveying pipeline into surface fractures to be sealed in the burning area of a coal field, to reduce and control air leakage, so as to prevent spontaneous combustion of the coal. 4

Claims (2)

1. An inorganic cured foam material for surface leaking stoppage in a shallow buried coal seam mining area, wherein, the inorganic cured foam material comprises the following components and parts by weight (pbw): water: 40-60pbw, coal ash: 100pbw, slaked lime: 5pbw, cement: 20pbw, ox horn powder: 0.15-0.3pbw, aluminum powder: 4pbw, copper oxide: 1-3.5pbw, polyphosphoric acid: 0.4-1.4pbw, aluminum hydroxide: 0.04-0.lpbw, hydroxypropyl methyl cellulose: 0.8-1.2pbw, and steel fiber: 3pbw, the copper oxide is in 300 mesh size.
2. A method for preparation of the inorganic cured foam material for surface leaking stoppage in a shallow buried coal seam mining area according to claim 1, wherein, the viscous liquid formed by the ox horn powder can reduce the surface tension of the serous liquid, distribute the solid particles in the slurry uniformly, and improve the stability of the foams; the aluminum powder and slaked lime have a chemical reaction and generate a gas, and they constitute a gas self-generation system for the slurry; the copper oxide, polyphosphoric acid, and aluminum hydroxide constitute an inorganic adhesive system, and the curing time is adjustable by adjusting the ratio of the three components; the manufacturing process is as follows: step 1: adding 35-55pbw water, 100pbw coal ash, 20pbw cement, 0.8-1.2pbw hydroxypropyl methyl cellulose, 3pbw steel fiber, and 5pbw slaked lime into a special mixing vessel A, and stir with a stirrer at 5,000+200rpm for 2minutes, to form a coal ash substrate slurry; step 2: adding 5pbw water and 0.15-0.3pbw ox horn powder into a special mixing vessel B, and stirring with a stirrer at 10,000+500rpm for 3minutes, to form an viscous liquid; step 3: adding the viscous liquid of ox horn powder in the special mixing vessel B into the coal ash substrate slurry in the special mixing vessel A, and stir with a stirrer in the special mixing vessel A at 12,000+500rpm for 3minutes, to form a mixed solution; step 4: adding a mixture prepared from 1-3.5pbw copper oxide, 0.4-1.4pbw polyphosphoric acid, and 0.04-0.lpbw aluminum hydroxide into the mixed solution, and stirring with a stirrer at 5,000+200rpm for 5minutes, to form a mixed adhesive solution; step 5: adding 4pbw aluminum powder into the mixed adhesive solution, and stirring with a stirrer at 12,000+500rpm for 3minutes, to prepare the inorganic cured foam material for surface fracture sealing in a coal mine. 5
AU2014253466A 2013-07-17 2014-02-18 Inorganic cured foam material for surface leaking stoppage in shallow buried coal seam mining area and preparation method of the same Ceased AU2014253466B2 (en)

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CN201310301511.2A CN103396154B (en) 2013-07-17 2013-07-17 Inorganic curing foam material for surface plugging of shallow coal seam mining area
PCT/CN2014/072169 WO2015007090A1 (en) 2013-07-17 2014-02-18 Inorganic cured foam material for surface leaking stoppage in shallow coal seam mining areas and preparation method thereof

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CN103967512B (en) * 2014-03-31 2016-08-17 中国矿业大学 A kind of water base foam of mining preventing and treating spontaneous combustionof coal and preparation method thereof
CN103964766B (en) * 2014-04-29 2016-09-14 胡相明 Flyash-cement foam material of preventing and treating spontaneous combustionof coal and preparation method thereof
CN105435411B (en) * 2015-12-01 2018-09-25 太原理工大学 A kind of metallic framework foam and preparation method thereof for coal spontaneous combustion diaster prevention and control
CN106679207B (en) 2017-01-09 2018-10-30 中国矿业大学 A method of extraction coal-field fire underground high-temperature region thermal energy
CN106593523B (en) * 2017-01-23 2018-08-17 中国矿业大学 Goaf air leaking control method in a kind of shallow embedding close-in seams recovery process
CN112480648B (en) * 2020-11-26 2022-05-03 湖南科技大学 Slurry foam material for blocking air leakage and generating heat through oxidation of shallow coal seam and preparation method thereof
CN113773827B (en) * 2021-08-31 2022-11-04 广汉市福客科技有限公司 Self-foaming delayed type solid foam drainage agent and preparation method thereof
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CN117447229B (en) * 2023-10-26 2024-08-06 山东智胜节能建材有限公司 Self-heat-preservation building block and preparation method thereof

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AU2014253466A1 (en) 2015-02-05
CN103396154A (en) 2013-11-20
ZA201407486B (en) 2016-11-30
RU2014143659A (en) 2016-05-27
WO2015007090A1 (en) 2015-01-22
CN103396154B (en) 2014-12-31

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