CN116143484A - Mine filling material based on coal gas slag, and preparation method and application thereof - Google Patents
Mine filling material based on coal gas slag, and preparation method and application thereof Download PDFInfo
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- CN116143484A CN116143484A CN202211685321.0A CN202211685321A CN116143484A CN 116143484 A CN116143484 A CN 116143484A CN 202211685321 A CN202211685321 A CN 202211685321A CN 116143484 A CN116143484 A CN 116143484A
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- gas slag
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- 239000002893 slag Substances 0.000 title claims abstract description 92
- 239000000463 material Substances 0.000 title claims abstract description 86
- 238000011049 filling Methods 0.000 title claims abstract description 75
- 239000003034 coal gas Substances 0.000 title claims abstract description 19
- 238000002360 preparation method Methods 0.000 title abstract description 14
- 239000000654 additive Substances 0.000 claims abstract description 78
- 230000000996 additive effect Effects 0.000 claims abstract description 66
- 239000000203 mixture Substances 0.000 claims abstract description 42
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 27
- 239000002910 solid waste Substances 0.000 claims abstract description 25
- 239000002994 raw material Substances 0.000 claims abstract description 20
- 239000011734 sodium Substances 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 15
- 239000010881 fly ash Substances 0.000 claims abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 15
- 239000003245 coal Substances 0.000 claims abstract description 13
- MSRJTTSHWYDFIU-UHFFFAOYSA-N octyltriethoxysilane Chemical compound CCCCCCCC[Si](OCC)(OCC)OCC MSRJTTSHWYDFIU-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229960003493 octyltriethoxysilane Drugs 0.000 claims abstract description 11
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims abstract description 10
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 10
- 239000010440 gypsum Substances 0.000 claims abstract description 8
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 8
- 238000003756 stirring Methods 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 9
- 239000002699 waste material Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- 238000000498 ball milling Methods 0.000 claims description 5
- 239000003755 preservative agent Substances 0.000 claims description 5
- 230000002335 preservative effect Effects 0.000 claims description 5
- 239000010426 asphalt Substances 0.000 claims description 3
- 239000011449 brick Substances 0.000 claims description 3
- 239000012634 fragment Substances 0.000 claims description 3
- 239000004570 mortar (masonry) Substances 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- 239000004566 building material Substances 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 20
- 238000012360 testing method Methods 0.000 description 7
- 239000000945 filler Substances 0.000 description 4
- 238000002309 gasification Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 229910018626 Al(OH) Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 229920000876 geopolymer Polymers 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- -1 iron-aluminum-silicon Chemical compound 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000002982 water resistant material Substances 0.000 description 1
Images
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
- C04B28/02—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
- C04B28/08—Slag cements
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/005—Methods or devices for placing filling-up materials in underground workings characterised by the kind or composition of the backfilling material
-
- 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
-
- 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
Abstract
The invention belongs to the technical field of building materials, and particularly relates to a mine filling material based on gas slag, a preparation method and application thereof. The mine filling material based on the gas slag comprises the following raw materials in parts by mass: 11-13 parts of coal gangue or building solid waste, 5-7 parts of coal gas slag, 2-3 parts of slag powder, 1-2 parts of fly ash, 1-2 parts of sodium metaaluminate, 0.05-0.1 part of additive A, 0.05-0.1 part of additive B, 0.01-0.03 part of additive C, 0.01-0.03 part of octyl triethoxysilane, 0.001-0.003 part of triethanolamine and 1.5-2 parts of water; wherein the additive A is a mixture of CaO and MgO, and the mass ratio of CaO to MgO is 2-4:3-7; the additive B is a mixture of desulfurized gypsum and anhydrous sodium sulfate, and the mass ratio of the additive B to the anhydrous sodium sulfate is 1-3:2-4; the additive C is NaOH or Na 2 SiO 3 The mass ratio of the composition is 1-3:2-4:2-3. And the preparation method of the material, which takes the gas slag as mine fillingThe filling material reduces the environmental pollution of the gas slag, and the 28d compressive strength of the prepared filling material is more than 28MPa.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a mine filling material based on gas slag, a preparation method and application thereof.
Background
With the large-scale popularization of the coal gasification technology, the gasification slag is generated in large quantity, and the annual production of the gasification slag exceeds 3300 ten thousand t. The coal gas slag is solid residue formed by inorganic mineral substances in coal through different physical-chemical conversion along with residual carbon particles in the coal in the process of generating CO and H2 by incomplete combustion of the coal and oxygen or oxygen-enriched air, and can be divided into coarse slag and fine slag. The coarse slag is generated at a slag discharging port of the gasification furnace and accounts for 60% -80%; the fine slag is mainly generated in a dust removing device of the synthesis gas and accounts for 20% -40%. The existing treatment mode of the gasified slag is mainly stockpiling and landfill, is not applied to large-scale industrialization, causes serious environmental pollution and land resource waste, and has adverse effects on sustainable development of coal chemical enterprises, and the treatment of the gasified slag is urgent.
Therefore, aiming at the technical defects, there is an urgent need to design and develop a mine filling material based on gas slag, and a preparation method and application thereof.
Disclosure of Invention
In order to overcome the defects and difficulties in the prior art, the invention aims to provide a mine filling material based on coal gas slag, and a preparation method and application thereof.
The first object of the invention is to provide a mine filling material based on gas slag;
the second aim of the invention is to provide a preparation method of mine filling material based on gas slag;
the third object of the invention is to provide an application of a mine filling material based on gas slag;
the first object of the present invention is achieved by: the material comprises the following raw materials in parts by mass:
11-13 parts of coal gangue or building solid waste, 5-7 parts of coal gas slag, 2-3 parts of slag powder, 1-2 parts of fly ash, 1-2 parts of sodium metaaluminate, 0.05-0.1 part of additive A, 0.05-0.1 part of additive B, 0.01-0.03 part of additive C, 0.01-0.03 part of octyl triethoxysilane, 0.001-0.003 part of triethanolamine and 1.5-2 parts of water;
wherein the additive A is a mixture of CaO and MgO, and the mass ratio of CaO to MgO is 2-4:3-7; the additive B is a mixture of desulfurized gypsum and anhydrous sodium sulfate, and the mass ratio of the additive B to the anhydrous sodium sulfate is 1-3:2-4; the additive C is NaOH or Na 2 SiO 3 The mass ratio of the composition is 1-3:2-4:2-3.
The second object of the present invention is achieved by: the method comprises the following steps:
1) Weighing the raw materials according to the mass parts of the raw materials; uniformly mixing the additives, sequentially placing the building solid waste and the additives into a stirrer for uniform stirring, and adding water for continuous stirring to obtain a filling material synthesized by the solid waste; stirring for no more than 1min;
2) And (3) injecting the stirred flowing filling material into a mould, vibrating for 30 seconds in a vibrating table, covering a preservative film on the surface of the filling material, curing for 24 hours, taking out the filling material block from the mould, and curing in a curing box with humidity higher than 95% and temperature 20+/-2 ℃.
The third object of the present invention is achieved by: the material is applied to mine filling.
The scheme of the invention is that the mine filling material based on the gas slag comprises the following raw materials in parts by mass: 11-13 parts of gangue or building solid waste, 5-7 parts of coal gas slag, 2-3 parts of slag powder, 1-2 parts of fly ash, 1-2 parts of sodium metaaluminate, 0.05-0.1 part of additive A and additive0.05-0.1 part of agent B, 0.01-0.03 part of additive C, 0.01-0.03 part of octyl triethoxysilane, 0.001-0.003 part of triethanolamine and 1.5-2 parts of water; wherein the additive A is a mixture of CaO and MgO, and the mass ratio of CaO to MgO is 2-4:3-7; the additive B is a mixture of desulfurized gypsum and anhydrous sodium sulfate, and the mass ratio of the additive B to the anhydrous sodium sulfate is 1-3:2-4; the additive C is NaOH or Na 2 SiO 3 The mass ratio of the composition is 1-3:2-4:2-3. And the preparation method of the material takes the gas slag as a mine filling material, reduces the environmental pollution of the gas slag, and the 28d compressive strength of the prepared filling material is more than 28MPa.
Drawings
FIG. 1 is a schematic cross-sectional view of a test block of a filler material prepared in example 3 of the present invention after 3 days of curing;
FIG. 2 is a schematic cross-sectional view of a test block of the filler material prepared in example 3 of the present invention after curing for 7 days;
FIG. 3 is a schematic cross-sectional view of a test block of filler material prepared in example 3 of the present invention for 28 days;
FIG. 4 is a schematic flow chart of a method for preparing a mine filling material based on gas slag.
Detailed Description
The invention is further described below with reference to the accompanying drawings, without limiting the invention in any way, and any alterations or substitutions based on the teachings of the invention are intended to fall within the scope of the invention.
As shown in fig. 1-4, the invention provides a mine filling material based on gas slag, which comprises the following raw materials in parts by weight:
11-13 parts of coal gangue or building solid waste, 5-7 parts of coal gas slag, 2-3 parts of slag powder, 1-2 parts of fly ash, 1-2 parts of sodium metaaluminate, 0.05-0.1 part of additive A, 0.05-0.1 part of additive B, 0.01-0.03 part of additive C, 0.01-0.03 part of octyl triethoxysilane, 0.001-0.003 part of triethanolamine and 1.5-2 parts of water;
wherein the additive A is a mixture of CaO and MgO, and the mass ratio of CaO to MgO is 2-4:3-7; the additive B is a mixture of desulfurized gypsum and anhydrous sodium sulfate,the mass ratio is 1-3:2-4; the additive C is NaOH or Na 2 SiO 3 The mass ratio of the composition is 1-3:2-4:2-3.
The additive B is ball-milled in a planetary ball mill for 3 hours to uniformly mix the composition, and the rotating speed of the ball mill is 300r/min.
The additive C is ball-milled in a planetary ball mill for 3 hours to uniformly mix the composition, and the rotating speed of the ball mill is 300r/min.
The solid waste of the building comprises filling material blocks, crushed stone blocks, brick fragments, waste mortar, slurry or asphalt blocks, and the particle size of the solid waste of the building is 10-30 mm.
The ratio of coarse slag to fine slag of the gas slag is 6-8:1-3, wherein the grain size of the coarse slag is 0.1-4.75 mm, and the specific surface area of the fine slag is not less than 150m 2 /kg。
The fly ash is primary or secondary fly ash with specific surface area not less than 370m 2 /kg; the slag powder is S95 or S105 grade slag powder with specific surface area not less than 450m 2 /kg。
In order to achieve the purpose of the scheme of the invention, the invention also provides a preparation method of the mine filling material based on the gas slag, which comprises the following steps:
1) Weighing the raw materials according to the mass parts of the raw materials; uniformly mixing the additives, sequentially placing the building solid waste and the additives into a stirrer for uniform stirring, and adding water for continuous stirring to obtain a filling material synthesized by the solid waste; stirring for no more than 1min;
2) And (3) injecting the stirred flowing filling material into a mould, vibrating for 30 seconds in a vibrating table, covering a preservative film on the surface of the filling material, curing for 24 hours, taking out the filling material block from the mould, and curing in a curing box with humidity higher than 95% and temperature 20+/-2 ℃.
The material comprises the following raw materials in parts by mass: 11-13 parts of coal gangue or building solid waste, 5-7 parts of coal gas slag, 2-3 parts of slag powder, 1-2 parts of fly ash, 1-2 parts of sodium metaaluminate, 0.05-0.1 part of additive A, 0.05-0.1 part of additive B, 0.01-0.03 part of additive C, 0.01-0.03 part of octyl triethoxysilane, 0.001-0.003 part of triethanolamine and 1.5-2 parts of water;
wherein the additive A is a mixture of CaO and MgO, and the mass ratio of CaO to MgO is 2-4:3-7; the additive B is a mixture of desulfurized gypsum and anhydrous sodium sulfate, and the mass ratio of the additive B to the anhydrous sodium sulfate is 1-3:2-4; the additive C is NaOH or Na 2 SiO 3 The mass ratio of the composition is 1-3:2-4:2-3.
The additive B is ball-milled in a planetary ball mill for 3 hours to uniformly mix the composition, and the rotating speed of the ball mill is 300r/min; the additive C is ball-milled in a planetary ball mill for 3 hours to uniformly mix the composition, and the rotating speed of the ball mill is 300r/min.
In order to achieve the purpose of the scheme, the invention also provides application of the mine filling material based on the gas slag, and the material is applied to mine filling.
Specifically, in the specific embodiment of the scheme of the invention, the filling material for the coal gas slag mine consists of the following raw materials in parts by weight: 11-13 parts of coal gangue/building solid waste, 5-7 parts of coal gas slag, 2-3 parts of slag powder, 1-2 parts of fly ash, 1-2 parts of sodium metaaluminate, 0.05-0.1 part of additive A, 0.05-0.1 part of additive B, 0.01-0.03 part of additive C, 0.01-0.03 part of octyl triethoxysilane, 0.001-0.003 part of triethanolamine and 1.5-2 parts of water.
The preparation method of the coal gas slag mine filling material is realized according to the following steps:
1) Weighing the raw materials according to the composition ratio of the raw materials; uniformly mixing the additives, sequentially placing the building waste residues and the additives into a stirrer for uniform stirring, and adding water for continuous stirring to obtain a filling material synthesized by solid wastes; stirring for no more than 1min;
2) And (3) injecting the stirred flowing filling material into a mould, vibrating for 30 seconds in a vibrating table, covering a preservative film on the surface of the filling material, curing for 24 hours, taking out the filling material block from the mould, and curing in a curing box with humidity higher than 95% and temperature 20+/-2 ℃. Wherein the humidity is more than 95 percent, and the temperature is 20+/-2 ℃ which is the standard condition.
The principle of the invention is as follows: the formula of the coal gas slag mine filling material is obtained by theory and experiment, wherein:
1. the mixture of the gas slag and the slag can be synthesized into a novel geopolymer composite material through the action of sodium hydroxide and sodium silicate. The compressive strength of the polymer can reach 70MPa at most.
2. Hydration of MgO within the additive to Mg (OH) 2 And growing in situ, adhering to the surfaces of other particles, gradually growing in micropores, and filling all micropores with the diameter of 20-60 mu m, so that the material is more compact.
3. Slowly dissolving sodium metaaluminate and CaO, gradually reacting, and recrystallizing to obtain double hydroxide Ca 4 Al(OH) 12 (CO 3 )•5H 2 O can greatly improve the strength of the material.
4. The gas slag has stronger quality and more pores in the interior, a large amount of water is absorbed in the early reaction stage, the early strength of the filling material is affected, and the octyl triethoxysilane is used as a high water resistant material, can be adsorbed on the surface of the gas slag, can well prevent the early water absorption phenomenon of the gas slag, achieves the aim of reducing the volume loss rate of the filling material, and meanwhile, the triethanolamine can also improve the strength of the filling material by the synergistic effect with the octyl triethoxysilane.
The beneficial effects of the invention are as follows: the method fully utilizes the characteristics of low price of building solid waste and gangue materials and certain strength, and the strength of the filling material is excited by the unique additive to obtain the economical and practical filling material. The filling material provided by the invention solves the problem of accumulation of a large amount of gangue and building waste residues, fully utilizes rich iron-aluminum-silicon resources in the gas slag, and has the advantages of simple preparation process, high production efficiency, simple and stable operation, convenient control and easy realization of automatic operation.
The invention discloses a coal gas slag mine filling material which is prepared from the following raw materials in parts by weight: 11-13 parts of coal gangue/building solid waste, 5-7 parts of coal gas slag, 2-3 parts of slag powder, 1-2 parts of fly ash, 1-2 parts of sodium metaaluminate, 0.05-0.1 part of additive A, 0.05-0.1 part of additive B, 0.01-0.03 part of additive C, 0.01-0.03 part of octyl triethoxysilane, 0.001-0.003 part of triethanolamine and 1.5-2 parts of water.
The building solid waste comprises filling material blocks, crushed stone blocks, brick and tile fragments, waste mortar, slurry, asphalt blocks and the like, and the particle size of the building solid waste is 10-30 mm.
The ratio of coarse slag to fine slag of the gas slag is 6-8:1-3, wherein the grain size of the coarse slag is 0.1-4.75 mm, and the specific surface area of the fine slag is not less than 150m 2 It is further preferable that the ratio of coarse slag to fine slag of the gas-converted slag is 7:3.
The fly ash is primary or secondary fly ash with specific surface area not less than 370m 2 /kg; the slag powder is S95 or S105 grade slag powder with specific surface area not less than 450m 2 /kg。
The additive A is a mixture of CaO and MgO, wherein the mass ratio of CaO to MgO is 2-4:3-7, and more preferably 3:5.
The additive B is a mixture of desulfurized gypsum and anhydrous sodium sulphate, the mass ratio is 1-3:2-4, more preferably 2:3, the composition is uniformly mixed by ball milling in a planetary ball mill for 3 hours, and the rotating speed of the ball mill is 300r/min.
The additive C is NaOH or Na 2 SiO 3 The mass ratio of the composition is 1-3:2-4:2-3, more preferably 2:3:2, and the composition is uniformly mixed by ball milling in a planetary ball mill for 3 hours, wherein the rotating speed of the ball mill is 300r/min.
The invention also provides a preparation method of the coal gas slag mine filling material, which is realized according to the following steps:
1) Weighing the raw materials according to the proportion of claim 1; uniformly mixing the additives, sequentially placing the building waste residues and the additives into a stirrer for uniform stirring, and adding water for continuous stirring to obtain a filling material synthesized by solid wastes; stirring for no more than 1min;
2) And (3) injecting the stirred flowing filling material into a mould, vibrating for 30 seconds in a vibrating table, covering a preservative film on the surface of the filling material, curing for 24 hours, taking out the filling material block from the mould, and curing in a curing box with humidity higher than 95% and temperature 20+/-2 ℃.
Examples 1 to 10
The following table shows the raw material ratios of examples 1 to 10
The preparation method comprises the steps of weighing raw materials according to the proportion shown in the table 1 in examples 1-10, uniformly mixing additives, sequentially placing building waste residues and the additives into a stirrer for uniform stirring, and continuously stirring by adding water to obtain a filling material synthesized by solid waste; the stirring time is not more than 1min.
The mixture is poured into a plastic triple mold with 100mm of thickness for molding, the filling material block is taken out of the mold after 24 hours, and the filling material block is put into a curing box with the humidity of 95 ℃ and the temperature of 20 ℃ for curing, and the filling material block is taken out after 3 days, 7 days and 28 days for testing the compressive strength. The compressive strength was measured in accordance with GB/T17671-1999 and the test results are shown in the following table.
From the above table, the 28d compressive strength of the filling materials prepared in examples 5-10 is greater than 28MPa, and the filling strength requirement of the mine is met. The test pieces of the filler materials prepared in examples 5 to 10 were observed, and the structural characteristics of example 7 were particularly focused. Fig. 1 to 3 are graphs of test blocks after the compressive strength of 3d, 7d and 28d in example 7 is destroyed, and the observation shows that the filling material is very compact, has good gelation property, has few material gaps and uniform component distribution, and can meet the requirements of practical application.
Compared with the application number 202211005460.4, which is a gangue admixture and application thereof and C15 concrete, the filling material obtained by the invention has compressive strength (28.2-31 MPa), the pressure resistance is higher than that of the comparative examples (24-26 MPa), and the pressure resistance is higher while the cost is low.
Claims (10)
1. The mine filling material based on the gas slag is characterized by comprising the following raw materials in parts by weight:
11-13 parts of coal gangue or building solid waste, 5-7 parts of coal gas slag, 2-3 parts of slag powder, 1-2 parts of fly ash, 1-2 parts of sodium metaaluminate, 0.05-0.1 part of additive A, 0.05-0.1 part of additive B, 0.01-0.03 part of additive C, 0.01-0.03 part of octyl triethoxysilane, 0.001-0.003 part of triethanolamine and 1.5-2 parts of water;
wherein the additive A is a mixture of CaO and MgO, and the mass ratio of CaO to MgO is 2-4:3-7; the additive B is a mixture of desulfurized gypsum and anhydrous sodium sulfate, and the mass ratio of the additive B to the anhydrous sodium sulfate is 1-3:2-4; the additive C is NaOH or Na 2 SiO 3 The mass ratio of the composition is 1-3:2-4:2-3.
2. The mine filling material based on gas slag according to claim 1, wherein the additive B is prepared by uniformly mixing the above composition by ball milling in a planetary ball mill for 3 hours at a rotational speed of 300r/min.
3. The mine filling material based on gas slag according to claim 1, wherein the additive C is prepared by uniformly mixing the above composition by ball milling in a planetary ball mill for 3 hours at a rotational speed of 300r/min.
4. The mine filling material based on gas slag as claimed in claim 1, wherein the building solid waste comprises filling material blocks, crushed stone blocks, brick and tile fragments, waste mortar, slurry or asphalt blocks, and the size of the building solid waste particle size is 10-30 mm.
5. The mine filling material based on the gas slag according to claim 1, wherein the ratio of coarse slag and fine slag of the gas slag is 6-8:1-3, the particle size of the coarse slag is 0.1-4.75 mm, and the specific surface area of the fine slag is not less than 150m 2 /kg。
6. The mine filling material based on gas slag as claimed in claim 1, wherein the fly ash is primary or secondary fly ash with specific surface area not less than 370m 2 /kg; the slag powder is S95 or S105 grade slag powder with specific surface area not less than 450m 2 /kg。
7. The method for preparing a mine filling material based on gas slag according to any one of claims 1 to 6, characterized in that it consists of the following steps:
1) Weighing the raw materials according to the mass parts of the raw materials; uniformly mixing the additives, sequentially placing the building solid waste and the additives into a stirrer for uniform stirring, and adding water for continuous stirring to obtain a filling material synthesized by the solid waste; stirring for no more than 1min;
2) And (3) injecting the stirred flowing filling material into a mould, vibrating for 30 seconds in a vibrating table, covering a preservative film on the surface of the filling material, curing for 24 hours, taking out the filling material block from the mould, and curing in a curing box with humidity higher than 95% and temperature 20+/-2 ℃.
8. The method for preparing the mine filling material based on the gas slag according to claim 7, wherein the material is composed of the following raw materials in parts by mass:
11-13 parts of coal gangue or building solid waste, 5-7 parts of coal gas slag, 2-3 parts of slag powder, 1-2 parts of fly ash, 1-2 parts of sodium metaaluminate, 0.05-0.1 part of additive A, 0.05-0.1 part of additive B, 0.01-0.03 part of additive C, 0.01-0.03 part of octyl triethoxysilane, 0.001-0.003 part of triethanolamine and 1.5-2 parts of water;
wherein the additive A is a mixture of CaO and MgO, and the mass ratio of CaO to MgO is 2-4:3-7; the additive B is a mixture of desulfurized gypsum and anhydrous sodium sulfate, and the mass ratio of the additive B to the anhydrous sodium sulfate is 1-3:2-4; the additive C is NaOH or Na 2 SiO 3 The mass ratio of the composition is 1-3:2-4:2-3.
9. The method for preparing a mine filling material based on gas slag according to claim 7, wherein the additive B is prepared by uniformly mixing the above composition by ball milling in a planetary ball mill for 3 hours, and the rotation speed of the ball mill is 300r/min;
the additive C is ball-milled in a planetary ball mill for 3 hours to uniformly mix the composition, and the rotating speed of the ball mill is 300r/min.
10. The use of a coal gas slag based mine filling material according to any of claims 1-6, wherein the material is used for mine filling.
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