CN113698165A - Hole sealing material and using method thereof - Google Patents
Hole sealing material and using method thereof Download PDFInfo
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- CN113698165A CN113698165A CN202110929588.9A CN202110929588A CN113698165A CN 113698165 A CN113698165 A CN 113698165A CN 202110929588 A CN202110929588 A CN 202110929588A CN 113698165 A CN113698165 A CN 113698165A
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- 239000003566 sealing material Substances 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000010881 fly ash Substances 0.000 claims abstract description 26
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 18
- 239000010440 gypsum Substances 0.000 claims abstract description 18
- 239000004568 cement Substances 0.000 claims abstract description 17
- 239000011398 Portland cement Substances 0.000 claims abstract description 13
- 239000002002 slurry Substances 0.000 claims abstract description 12
- 239000011148 porous material Substances 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 7
- 229910052681 coesite Inorganic materials 0.000 claims description 7
- 229910052906 cristobalite Inorganic materials 0.000 claims description 7
- 239000000377 silicon dioxide Substances 0.000 claims description 7
- 229910052682 stishovite Inorganic materials 0.000 claims description 7
- 229910052905 tridymite Inorganic materials 0.000 claims description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 6
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims description 6
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 6
- 239000003546 flue gas Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 239000002910 solid waste Substances 0.000 claims description 5
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 4
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 4
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 4
- 229910052593 corundum Inorganic materials 0.000 claims description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 4
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 4
- 235000011152 sodium sulphate Nutrition 0.000 claims description 4
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 4
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 3
- 239000006227 byproduct Substances 0.000 claims description 3
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 3
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 3
- 239000003245 coal Substances 0.000 abstract description 16
- 238000000605 extraction Methods 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 2
- 238000011049 filling Methods 0.000 abstract description 2
- 238000002347 injection Methods 0.000 abstract description 2
- 239000007924 injection Substances 0.000 abstract description 2
- 239000011863 silicon-based powder Substances 0.000 abstract description 2
- 238000007789 sealing Methods 0.000 description 15
- 239000007789 gas Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 239000002994 raw material Substances 0.000 description 8
- 239000003795 chemical substances by application Substances 0.000 description 5
- 239000000378 calcium silicate Substances 0.000 description 3
- 229910052918 calcium silicate Inorganic materials 0.000 description 3
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
-
- 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
- C04B28/14—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 calcium sulfate cements
- C04B28/142—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/144—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/08—Flue dust, i.e. fly ash
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/02—Portland cement
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/32—Aluminous cements
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/138—Plastering the borehole wall; Injecting into the formation
-
- 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
- C04B2111/00663—Uses not provided for elsewhere in C04B2111/00 as filling material for cavities or the like
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Combustion & Propulsion (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a hole sealing material and a using method thereof, which are used for solving the problems of long setting time and poor slurry fluidity of the conventional hole sealing material. The hole sealing material of the invention comprises the following components in percentage by weight: 700 portions and 800 portions of Portland cement; 80-100 parts of sulphoaluminate cement clinker; 30-50 parts of an accelerator; 50-150 parts of fly ash; 50-100 parts of desulfurized gypsum. The hole sealing material provided by the invention is suitable for a bag type two-plugging one-injection gas extraction process, the setting time and the slurry fluidity can be adjusted by adjusting the using amounts of the micro silicon powder and the accelerator according to the using requirements, the good fluidity and the thixotropy of the slurry can quickly fill pore canals and coal seam cracks and quickly set in a short time, and the hole sealing material has a good filling effect on the coal seam cracks; the compressive strength is high, and the change of the coal bed to a certain degree in the gas extraction process can be accepted.
Description
Technical Field
The invention relates to the technical field of hole sealing materials for mines, in particular to a hole sealing material and a using method thereof.
Background
The gas is one of five disasters in coal mine production, which seriously restricts the safety production of the coal mine, and the current coal mine adopts a mode of mainly gas drilling extraction. The reason that the gas extraction effect is not ideal is that the hole sealing quality is one of the important factors for determining the extraction efficiency besides the reasons that the coal seam occurrence condition is complex, the coal seam air permeability is poor, the extraction process is not matched and the like.
The quality of hole sealing depends on hole sealing materials and hole sealing processes, and the performance of the hole sealing materials is more important. Most of the components of the polyurethane material are toxic and have higher cost; the clay material is easy to soften when meeting water and has poor sealing effect; the cement hole sealing material is convenient to operate, low in cost, wide in source and large in hole sealing depth, is very suitable for being used as coal mine gas extraction hole sealing, and has the problems of low early strength, long solidification time, easiness in shrinkage and air leakage, poor impact resistance and the like.
Disclosure of Invention
In view of the above analysis, the embodiments of the present invention are directed to provide a plugging material and a method for using the same, so as to solve the problems of long setting time and poor slurry fluidity of the conventional plugging material.
In one aspect, the present invention provides a pore sealing material, which comprises, by weight:
700 portions and 800 portions of Portland cement;
80-100 parts of sulphoaluminate cement clinker;
30-50 parts of an accelerator;
50-150 parts of fly ash;
50-100 parts of desulfurized gypsum.
Further, the accelerator comprises the following components in percentage by mass: 60% of polyaluminium chloride, 10% of polyaluminium sulfate, 14% of sodium sulfate, 5.5% of sodium carbonate, 2.5% of sodium carboxymethyl cellulose and 8% of hemihydrate gypsum.
Further, the Cl content in the polyaluminium chloride is 46.01 percent, and Al is2O335.17% of CaO, 13.05% of SiO22.43% of Fe2O3The content is 2.25% in mass fraction.
Further, the portland cement is numbered 42.5.
Further, the specific surface area of the sulphoaluminate cement clinker is 500m2/kg。
Further, the fly ash is industrial solid waste collected from flue gas by coal-fired industrial enterprises;
the fly ash comprises active SiO2Active Al2O3And free CaO, the free CaO content being not less than 10%.
Further, the particle size of the fly ash is less than or equal to 2 microns, and the percentage of the fly ash with the particle size of less than or equal to 1 micron in the total amount of the fly ash is not less than 50%.
Furthermore, the desulfurized gypsum is an industrial byproduct obtained by coal-fired industrial enterprises after treating sulfur dioxide in flue gas, and the content of calcium sulfate is more than or equal to 90 percent.
Further, the specific surface area of the exfoliated gypsum is 400m2/kg。
On the other hand, the invention provides a use method of the hole sealing material, which comprises the steps of mixing the hole sealing material with water according to the proportion of 1 (1-1.5), stirring to form slurry, and pumping for grouting.
Compared with the prior art, the invention can realize at least one of the following beneficial effects:
(1) the coal ash, the desulfurized gypsum and the like are applied to the hole sealing material, so that the harmless comprehensive utilization of industrial solid wastes is realized;
(2) according to the hole sealing material provided by the invention, the main raw material adopts the Portland cement with lower cost, and compared with the hole sealing material taking the sulphoaluminate cement as the main raw material, the material cost is greatly reduced, the situation that the later strength of the sulphoaluminate cement is inverted and contracted is avoided, and meanwhile, the harmless comprehensive utilization of industrial solid waste is realized;
(3) the hole sealing material provided by the invention is suitable for a bag type two-plugging one-injection gas extraction process, the setting time and the slurry fluidity can be adjusted by adjusting the using amounts of the micro silicon powder and the accelerator according to the using requirements, the slurry with good fluidity and thixotropy can quickly fill pore canals and coal seam cracks and quickly set in a short time, and the hole sealing material has a good filling effect on the coal seam cracks; the compressive strength is high, and the change of a coal bed to a certain degree in the gas extraction process can be borne;
(4) the hole sealing material and the use method can realize the technical requirements of large sealing depth, compact hole sealing, adjustable fluidity, capability of sealing tiny gaps of coal seams and the like.
In the invention, the technical schemes can be combined with each other to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description.
Detailed Description
The embodiments of the present invention are provided to explain the principle of the present invention and not to limit the scope of the present invention.
The invention provides a hole sealing material which is used as a material for coal mine gas extraction hole sealing and comprises the following components (by weight):
700 portions and 800 portions of Portland cement;
80-100 parts of sulphoaluminate cement clinker;
30-50 parts of an accelerator;
50-150 parts of fly ash;
50-100 parts of desulfurized gypsum.
Wherein the accelerator comprises (by mass fraction): 60% of polyaluminium chloride, 10% of polyaluminium sulfate, 14% of sodium sulfate, 5.5% of sodium carbonate, 2.5% of sodium carboxymethyl cellulose and 8% of hemihydrate gypsum, and the components are mixed and used. Specifically, the polyaluminium chloride and the polyaluminium sulfate can improve the gelling capacity of the gel and improve the hydration degree of the cement; the sodium carbonate forms calcium carbonate and C-S-H gel by consuming calcium hydroxide, and promotes the dissolution and hydration of calcium silicate and calcium aluminate; the sodium sulfate can accelerate the volcanic ash reaction of the fly ash, so that the hydration of calcium silicate and calcium aluminate is accelerated, the carboxymethyl cellulose can absorb free water, and the cohesiveness of the slurry is increased; the semi-hydrated gypsum plays a role in quick setting by quickly separating out the semi-hydrated gypsum when meeting water.
The Cl content of the polyaluminium chloride in the accelerator was 46.01%, and Al was2O335.17% of CaO, 13.05% of SiO22.43% of Fe2O3The content is 2.25 percent, and the polyaluminium chloride is in industrial grade by mass fraction.
Portland cement is designated by 42.5.
The specific surface area of the sulphoaluminate cement clinker is 500m2Kg, obtained by purchase (available from gold source engineering materials ltd in the present example), whose main components include: CaO (content 43.42%), Al2O3(content: 32.77%), SiO2(content: 11.02%), SO3(content: 6.47%) and Fe2O3(content: 3.24%) by mass fraction.
The fly ash is industrial solid waste collected from flue gas by coal-fired industrial enterprises, and the main component of the fly ash comprises active SiO2Active Al2O3And free CaO, wherein the CaO content is not less than 10%. The fly ash partially replaces cement to play a certain role in dilution, the alkalinity in a reaction system is reduced, calcium silicate hydrate can be generated, and the compactness of the hole sealing material is improved. Specifically, the particle size of the fly ash is less than or equal to 2 microns, and the fly ash with the particle size of less than or equal to 1 micron accounts for not less than 50% of the total amount of the fly ash.
The desulfurized gypsum is an industrial byproduct obtained by treating sulfur dioxide in flue gas by coal-fired industrial enterprises, the content of calcium sulfate is more than or equal to 90 percent, and the desulfurized gypsum is ground until the specific surface area is 400m2Used after/kg.
The gas extraction process is a bag type two-plugging and one-pouring cement mortar technology, and the bag and the hole sealing part are made of the same hole sealing material.
The hole sealing principle of the bag type hole sealing device is that a grouting pipe is used for grouting the bags, the bags are in close contact with the wall of a drill hole after the bags expand, when the grouting pressure exceeds the opening pressure of the grouting nozzle, the grouting nozzle injects slurry into a gap between the two bags, the slurry enters a gap between the bags and the wall of the drill hole and a coal body gap at a certain depth of the periphery of the drill hole, and therefore hole sealing of the extraction drill hole is achieved.
The invention also provides a preparation method of the hole sealing material, which comprises the following steps: and mixing the raw materials according to a proportion, uniformly stirring, and respectively packaging and storing to obtain the hole sealing material.
The invention also provides a use method of the hole sealing material, which comprises the following steps: mixing the hole sealing material with water in a ratio of 1: (1-1.5), stirring to form slurry, and pumping for grouting.
Example 1
A pore sealing material comprises the following components (by weight): 700 parts of Portland cement, 100 parts of sulphoaluminate cement clinker, 50 parts of accelerating agent, 150 parts of fly ash and 100 parts of desulfurized gypsum.
The components in the raw materials are mixed according to a ratio, stirred uniformly, mixed with water according to a mass ratio of 1:1, and then are used by grouting after being stirred uniformly.
Example 2
A pore sealing material comprises the following components (by weight): 800 parts of Portland cement, 80 parts of sulphoaluminate cement clinker, 50 parts of accelerating agent, 150 parts of fly ash and 100 parts of desulfurized gypsum.
The components in the raw materials are mixed according to a ratio, stirred uniformly, mixed with water according to a mass ratio of 1:1, and then are used by grouting after being stirred uniformly.
Example 3
A pore sealing material comprises the following components (by weight): 800 parts of Portland cement, 100 parts of sulphoaluminate cement clinker, 30 parts of accelerating agent, 150 parts of fly ash and 100 parts of desulfurized gypsum.
The components in the raw materials are mixed according to a ratio, stirred uniformly, mixed with water according to a mass ratio of 1:1.5, and then are used by grouting after being stirred uniformly.
Example 4
A pore material comprising the following components (by weight): 800 parts of Portland cement, 100 parts of sulphoaluminate cement clinker, 50 parts of accelerating agent, 50 parts of fly ash and 100 parts of desulfurized gypsum.
The components in the raw materials are mixed according to a ratio, stirred uniformly, mixed with water according to a mass ratio of 1:1, and then are used by grouting after being stirred uniformly.
Example 5
A cementitious sealing material comprising the following components (by weight): 800 parts of Portland cement, 100 parts of sulphoaluminate cement clinker, 50 parts of accelerating agent, 150 parts of fly ash and 50 parts of desulfurized gypsum.
The components in the raw materials are mixed according to a ratio, stirred uniformly, mixed with water according to a mass ratio of 1:1, and then are used by grouting after being stirred uniformly.
The properties of the materials obtained in examples 1 to 5 are as follows:
the hole sealing material provided by the invention has high fluidity, can realize long-distance conveying, has initial setting time within 30-60 min, has the 24-hour compressive strength of hole sealing larger than 2MPa, can be used for drilling extraction, has the later-stage compressive strength of 10MPa, and has a certain supporting effect on coal seam loosening.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (10)
1. The hole sealing material is characterized by comprising the following components in parts by weight:
700 portions and 800 portions of Portland cement;
80-100 parts of sulphoaluminate cement clinker;
30-50 parts of an accelerator;
50-150 parts of fly ash;
50-100 parts of desulfurized gypsum.
2. The hole sealing material according to claim 1, wherein the accelerator comprises, in mass fraction: 60% of polyaluminium chloride, 10% of polyaluminium sulfate, 14% of sodium sulfate, 5.5% of sodium carbonate, 2.5% of sodium carboxymethyl cellulose and 8% of hemihydrate gypsum.
3. The pore sealing material according to claim 2, wherein the content of Cl in the polyaluminum chloride is 46.01%, and Al is2O335.17% of CaO, 13.05% of SiO22.43% of Fe2O3The content is 2.25% in mass fraction.
4. The sealing material according to claim 1, wherein the portland cement is denoted by 42.5.
5. The sealing material according to claim 1, characterized in that the specific surface area of the sulphoaluminate cement clinker is 500m2/kg。
6. The hole sealing material according to claim 1, wherein the fly ash is industrial solid waste captured from flue gas by coal-fired industrial enterprises;
the fly ash comprises active SiO2Active Al2O3And free CaO, the free CaO content being not less than 10%.
7. The hole sealing material according to claim 6, characterized in that the particle size of the fly ash is 2 μm or less, and the percentage of the fly ash with the particle size of 1 μm or less to the total amount of the fly ash is not less than 50%.
8. The hole sealing material according to claim 1, wherein the desulfurized gypsum is an industrial byproduct obtained by coal-fired industrial enterprises after treatment of sulfur dioxide in flue gas, and the content of calcium sulfate is not less than 90%.
9. The pore sealing material according to claim 8, wherein the desulfurized gypsum has a specific surface area of 400m2/kg。
10. A use method of the hole sealing material is characterized in that the hole sealing material as claimed in any one of claims 1 to 9 is mixed with water in a ratio of 1 (1-1.5), stirred to form slurry, and pumped for grouting.
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