CN113292305A - Alkali-activated high-water mine filling material based on multiple solid waste synergies and preparation method thereof - Google Patents
Alkali-activated high-water mine filling material based on multiple solid waste synergies and preparation method thereof Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 57
- 238000011049 filling Methods 0.000 title claims abstract description 42
- 239000003513 alkali Substances 0.000 title claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 239000002910 solid waste Substances 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 239000002893 slag Substances 0.000 claims abstract description 46
- 239000003245 coal Substances 0.000 claims abstract description 39
- 239000012190 activator Substances 0.000 claims abstract description 22
- 239000010881 fly ash Substances 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 18
- 239000010440 gypsum Substances 0.000 claims abstract description 15
- 239000000378 calcium silicate Substances 0.000 claims abstract description 14
- 229910052918 calcium silicate Inorganic materials 0.000 claims abstract description 14
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims abstract description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 239000000654 additive Substances 0.000 claims description 11
- 230000000996 additive effect Effects 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 10
- 238000001238 wet grinding Methods 0.000 claims description 10
- 238000002309 gasification Methods 0.000 claims description 7
- 239000004568 cement Substances 0.000 claims description 5
- 239000003638 chemical reducing agent Substances 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 239000007832 Na2SO4 Substances 0.000 claims description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 2
- 239000002639 bone cement Substances 0.000 claims description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims 2
- 238000002156 mixing Methods 0.000 claims 1
- 229910000029 sodium carbonate Inorganic materials 0.000 claims 1
- 238000005065 mining Methods 0.000 abstract description 21
- 238000005516 engineering process Methods 0.000 abstract description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052782 aluminium Inorganic materials 0.000 abstract description 5
- 238000000605 extraction Methods 0.000 abstract description 2
- 238000010248 power generation Methods 0.000 abstract description 2
- 238000005086 pumping Methods 0.000 abstract description 2
- 230000002195 synergetic effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract 1
- 239000003292 glue Substances 0.000 description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 description 6
- 239000011707 mineral Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 238000006477 desulfuration reaction Methods 0.000 description 3
- 230000023556 desulfurization Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000005997 Calcium carbide Substances 0.000 description 2
- 229910001653 ettringite Inorganic materials 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 1
- 241000668854 Howardia biclavis Species 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 229910052909 inorganic silicate Inorganic materials 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 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
- C04B18/0481—Other specific industrial waste materials not provided for elsewhere in C04B18/00
-
- 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
- C04B18/065—Residues from coal gasification
-
- 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
- C04B18/12—Waste materials; Refuse from quarries, mining 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
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses an alkali-activated high-water type mine filling material based on the synergy of various solid wastes and a preparation method thereof, which fully utilizes coal gangue, fly ash, desulfurized gypsum, gasified slag and carbide slag generated by coal mining and power generation, and coal-based solid wastes such as calcium silicate slag generated by fly ash alkali-process aluminum extraction technology independently developed in China in recent years as main raw materials, and is matched with a certain amount of alkali activator to prepare the high-performance alkali-activated high-water type mine filling material. The processing technology and the raw material ratio can be adjusted according to the transportation distance, the transportation mode and the pumping technology, the characteristics of each solid waste are fully exerted, the synergistic enhancement effect is realized, the utilization problem of the solid wastes is solved, and the alkali-activated high-water mine filling material prepared by the synergy of various solid wastes has the characteristics of good fluidity, high strength and low cost, and is convenient for large-scale popularization and application.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to an alkali-activated high-water mine filling material based on multiple solid waste synergies and a preparation method thereof.
Background
With the rapid growth of the world economy and population, the demand of human beings on mineral resources is increasing day by day, and the solid waste and the mined-out area generated by the mass mining of the mineral resources bring serious threats to the ecological environment and the geological safety. The filling mining technology is a coal mining method which utilizes an artificial filling goaf to replace mined resources to support an overlying strata and control the fracture of the overlying strata, can not only mine resources, but also effectively control surface subsidence and protect ground buildings and cultivated land, simultaneously provides technical support for the mining of 'three lower' pressed coal, can realize the protective mining of the ecological environment of the surface, and is one of the main methods for the green mining of the mineral products.
The filling technology of the paste-like body is researched and applied earlier in China, and the ordinary Portland cement is mainly used as a cementing material, but the cost is extremely high and the paste-like body is difficult to popularize in a large range. The development of the paste filling mining technology in China is late, and currently, the filling mining methods and technologies applied to coal mines in China mainly comprise solid working face filling mining, solid roadway filling, paste working face filling mining, overlying strata separation layer grouting filling mining, high-water material filling mining and the like. The filling material is an important restriction factor for popularization and application of coal mine filling mining in China. The rate of the raw coal gangue available in the coal mine is about 20 percent, and the source of the filling material of the coal mine is insufficient, so that the filling mining scale of the coal mine cannot meet the requirement, and the large-scale popularization and application of the filling mining technology of the coal mine is seriously hindered.
The method solves the difficult problems of insufficient filling material and high cost, and firstly, a novel filling material with high efficiency, high quality, low price and environmental protection is researched and developed, which is an important link for breaking the large-scale and high-cost problems of coal mine filling and mining in the future; secondly, the ecological treatment method is closely combined with the ecological treatment of the ground surface of the mining area, fully utilizes regional resources, and applies a filling method to carry out the ecological treatment according to the unified planning of the ecological treatment; thirdly, various industrial solid wastes, in particular tailings, coal gangue and other solid wastes generated by the mine are fully utilized.
The coal-based solid wastes such as coal gangue, coal ash, desulfurized gypsum, gasified slag and carbide slag generated by coal mining and power generation, silicon-calcium slag generated by the fly ash alkaline process aluminum extraction technology independently developed in China in recent years are fully utilized as main raw materials, and a certain amount of alkali activator is matched to prepare the high-performance alkali-activated high-water-content mine filling material, so that on one hand, the material source guarantee is provided for filling mining, on the other hand, the large-amount utilization of solid waste resources is realized, and the purposes of green mining and efficient utilization of resources are achieved.
Disclosure of Invention
The invention aims to provide an alkali-activated high-water type mine filling material based on multiple solid waste synergies and a preparation method thereof.
A preparation method of an alkali-activated high-water type mine filling material based on multiple solid waste synergies comprises the following steps:
1) taking fly ash, coal gasification slag, calcium silicate slag, desulfurized gypsum and carbide slag as main cementing materials, and preparing a primary cementing material by wet grinding;
2) preparing graded aggregate by crushing the coal gangue;
3) sequentially adding the initial cementing material obtained in the step 1), the coal gangue aggregate obtained in the step 2), water, the alkali activator and the additive into a stirring tank, and stirring for 2.5-5min to prepare the alkali-activated high-water mine filling material.
Further, the primary cementing material comprises the following raw materials in parts by weight: 10-30 parts of fly ash, 5-20 parts of gasified slag, 15-35 parts of carbide slag, 10-30 parts of calcium silicate slag and 5-20 parts of desulfurized gypsum, wherein the parts by weight are calculated on a dry basis.
Further, the particle size of the primary cementing material after wet grinding in the step 1) is controlled to be less than 100 meshes and accounts for more than 75 percent.
Further, the coal gangue aggregate gradation of step 2): 43-70 parts of 0-5mm, 15-28 parts of 5-10mm and 11-28 parts of 10-16 mm.
Further, the doping amount of the alkali activator in the step 3) is 1-6% of that of the primary cementing material, and the alkali activator is prepared from NaOH and Na in a dry basis2CO3、Na2SO4·10H2O, KOH one or more ofSeveral compositions.
Further, the method is characterized in that the addition amount of the additive in the step 3) is 0.05-1.5% of that of the primary cementing material, and the additive consists of a retarder, a water reducing agent and a water-retaining agent in a dry basis.
Furthermore, the water-cement ratio of the prepared alkali-activated high-water type mine filling material is 6:1-15:1, and the bone-cement ratio is 3:1-6: 1.
An alkali-activated high-water type mine filling material prepared according to the above method.
The invention has the following advantages:
(1) treat waste with waste, and take materials nearby. The coal gangue is the main solid waste in mining area, the fly ash and the desulfurized gypsum are the main solid waste in power plant, the calcium silicate slag is the solid waste of alumina extracted from the fly ash, the carbide slag is used as the calcium carbide hydration solid waste, and the solid waste is generally closer to the mine position. The alkali-activated high-water mine filling material prepared by the synergistic effect of various solid wastes is obtained locally, so that the utilization problem of the solid wastes is solved, the occupied area of stockpiling is reduced, the damage to the ecological environment is reduced, and the alkali-activated high-water mine filling material has the characteristics of good fluidity, high strength and low cost, and is beneficial to large-scale popularization and application.
(2) The alkali-activated high-water mine filling material can adjust the raw material proportion and the additive dosage according to the transportation distance, the transportation mode and the pumping process, or can prepare the materials such as a wet-ground primary cementing material, coal gangue aggregate, an alkali activator, an additive and the like in advance at other places and then transport the materials to the site to be uniformly mixed, thereby having flexible construction process.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
The fly ash and the coal gasification slag are mainly vitreous phase minerals containing silicon and aluminum, and the carbide slag is Ca (OH) generated by calcium carbide hydrolysis2Mainly solid waste, the silico-calcium slag is produced in the process of extracting aluminum by the high-alumina fly ash predesilicification-soda lime sintering method2SiO4The main solid waste is Ca-containing desulfurized gypsum2SO4·2H2The coal gangue is a solid waste mainly comprising silicon and aluminum. Therefore, after A certain amount of alkali activator is added, the alkali activator can generate alkali-activated reaction with the fly ash, the coal gasification slag, the carbide slag and the calcium silicate slag to generate A C-S-A-H cementing material, the carbide slag, the calcium silicate slag and the desulfurized gypsum can be hydrated to generate A high-water mineral of ettringite, and the chemical formulA of the high-water mineral is 3 CaO. Al2O3·3CaSO4·32H2O, crystal structure of each ettringite phase comprising 32 molecules of water, three molecules of SO42-Six molecules of Ca2+And one molecule of AlO2。
The first embodiment is as follows:
initial cement: 23 parts of fly ash (dry basis), 14 parts of gasified slag (dry basis), 21 parts of carbide slag (dry basis), 22 parts of calcium silicate slag (dry basis) and 20 parts of desulfurized gypsum (dry basis);
grading the coal gangue aggregate: 52 parts of 0-5mm, 22 parts of 5-10mm and 26 parts of 10-16 mm;
alkali activator: the dosage of the alkali activator is 3.3% of the initial cementing material (dry basis), and the dosage of NaOH in the activator is as follows: na (Na)2SO4·10H2O: KOH is 5:4: 1;
additive: the addition amount of the admixture is 0.12 percent of the primary cementing material (dry basis), and the retarder in the admixture is as follows: water reducing agent: the water-retaining agent is 3:5: 2;
water-to-glue ratio: 8: 1; bone-to-glue ratio: 5: 1;
the fly ash, the coal gasification slag, the carbide slag, the calcium silicate slag and the desulfurization gypsum are subjected to wet grinding according to the mixture ratio, and the particle size after wet grinding is smaller than 100 meshes and is about 82 percent. Sequentially adding the primary cementing material, the coal gangue aggregate, the water, the alkali activator and the admixture into a stirring barrel for stirring for about 2.5 min. The detection shows that the fluidity of the paste-like filling material is 220mm/m, the fluidity loss is less than or equal to +/-3 mm in 30min, the initial setting time is 130min, the final setting time is 280min, the 3-day compressive strength is 4.8MPa, the 28-day compressive strength is 11.5MPa, and the 90-day compressive strength is 23.8MPa.
Example two:
initial cement: 26 parts of fly ash (dry basis), 18 parts of gasified slag (dry basis), 25 parts of carbide slag (dry basis), 22 parts of calcium silicate slag (dry basis) and 9 parts of desulfurized gypsum (dry basis);
grading the coal gangue aggregate: 58 parts of 0-5mm, 25 parts of 5-10mm and 17 parts of 10-16 mm;
alkali activator: the dosage of the alkali activator is 5.4% of the initial cementing material (dry basis), and the dosage of NaOH in the activator is as follows: na (Na)2SO4·10H2O: KOH is 6:3: 1;
additive: the addition amount of the admixture is 0.1 percent of the primary cementing material (dry basis), and the retarder in the admixture is as follows: water reducing agent: 5:3:2 of water-retaining agent;
water-to-glue ratio: 10: 1; bone-to-glue ratio: 6: 1;
the fly ash, the coal gasification slag, the carbide slag, the calcium silicate slag and the desulfurization gypsum are subjected to wet grinding according to the mixture ratio, and the particle size after wet grinding is less than 100 meshes and is about 85 percent. Sequentially adding the primary cementing material, the coal gangue aggregate, the water, the alkali activator and the admixture into a stirring barrel for stirring for about 3 min. The detection shows that the fluidity of the paste-like filling material is 250mm/m, the fluidity loss is less than or equal to +/-6 mm in 30min, the initial setting time is 150min, the final setting time is 310min, the 3-day compressive strength is 5.6MPa, the 28-day compressive strength is 13.7MPa, and the 90-day compressive strength is 31.6 MPa.
Example three:
initial cement: 25 parts of fly ash (dry basis), 15 parts of gasified slag (dry basis), 30 parts of carbide slag (dry basis), 15 parts of calcium silicate slag (dry basis) and 15 parts of desulfurized gypsum (dry basis);
grading the coal gangue aggregate: 62 parts of 0-5mm, 18 parts of 5-10mm and 20 parts of 10-16 mm;
alkali activator: the dosage of the alkali activator is 5.5% of the initial cementing material (dry basis), and the dosage of NaOH in the activator is as follows: na (Na)2CO3: KOH is 5:3: 2;
additive: the addition amount of the admixture is 0.9 percent of the primary cementing material (dry basis), and the retarder in the admixture is as follows: water reducing agent: 5:3:2 of water-retaining agent;
water-to-glue ratio: 12: 1; bone-to-glue ratio: 5: 1;
the fly ash, the coal gasification slag, the carbide slag, the calcium silicate slag and the desulfurization gypsum are subjected to wet grinding according to the mixture ratio, and the particle size after wet grinding is less than 100 meshes and is about 80 percent. Sequentially adding the primary cementing material, the coal gangue aggregate, the water, the alkali activator and the admixture into a stirring barrel for stirring for about 3 min. The detection shows that the fluidity of the paste-like filling material is 210mm/m, the fluidity loss is less than or equal to +/-2 mm in 30min, the initial setting time is 140min, the final setting time is 270min, the 3-day compressive strength is 5.4MPa, the 28-day compressive strength is 13.8MPa, and the 90-day compressive strength is 28.7 MPa.
Claims (8)
1. A preparation method of an alkali-activated high-water mine filling material based on multiple solid waste synergies is characterized by comprising the following steps:
1) taking fly ash, coal gasification slag, calcium silicate slag, desulfurized gypsum and carbide slag as main cementing materials, and preparing a primary cementing material by wet grinding;
2) preparing graded aggregate by crushing the coal gangue;
3) sequentially adding the initial cementing material obtained in the step 1), the coal gangue aggregate obtained in the step 2), water, the alkali activator and the additive into a stirring tank, and stirring for 2.5-5min to prepare the alkali-activated high-water mine filling material.
2. The preparation method of claim 1, wherein the primary cementing material comprises the following raw materials in parts by weight: 10-30 parts of fly ash, 5-20 parts of gasified slag, 15-35 parts of carbide slag, 10-30 parts of calcium silicate slag and 5-20 parts of desulfurized gypsum, wherein the parts by weight are calculated on a dry basis.
3. The method of claim 1, wherein the size of the primary cementitious material after wet milling in step 1) is controlled to less than 100 mesh, at least 75%.
4. The method of claim 1, wherein the coal gangue aggregate gradation of step 2): 43-70 parts of 0-5mm, 15-28 parts of 5-10mm and 11-28 parts of 10-16 mm.
5. The method of claim 1, wherein the alkali activator in step 3)The mixing amount of the raw material is 1-6% of the primary cementing material, and the weight ratio is calculated by dry basis and is composed of NaOH and Na2CO3、Na2SO4·10H2O, KOH is one or more of the following components.
6. The preparation method of claim 1, wherein the additive in the step 3) is 0.05-1.5% of the primary cementing material, and the additive comprises a retarder, a water reducer and a water retention agent in a dry basis.
7. The preparation method of claim 1, wherein the prepared alkali-activated high-water type mine filling material has a water-cement ratio of 6:1 to 15:1 and a bone-cement ratio of 3:1 to 6: 1.
8. An alkali-activated high-water type mine-filling material prepared by the method of any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110701516.9A CN113292305A (en) | 2021-06-24 | 2021-06-24 | Alkali-activated high-water mine filling material based on multiple solid waste synergies and preparation method thereof |
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| CN202110701516.9A CN113292305A (en) | 2021-06-24 | 2021-06-24 | Alkali-activated high-water mine filling material based on multiple solid waste synergies and preparation method thereof |
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| CN114477907A (en) * | 2022-02-18 | 2022-05-13 | 涉县清漳水泥制造有限公司 | Premixed pump concrete prepared from coal-made oil residues and preparation method thereof |
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| CN115490497A (en) * | 2022-11-02 | 2022-12-20 | 东南大学 | Broad-spectrum curing agent and preparation method thereof |
| CN116003055A (en) * | 2022-12-22 | 2023-04-25 | 陕西碳提取节能环保科技(集团)有限公司 | Coal chemical industry gasification slag coal gangue backfill and preparation method thereof |
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| CN115490497A (en) * | 2022-11-02 | 2022-12-20 | 东南大学 | Broad-spectrum curing agent and preparation method thereof |
| CN115490497B (en) * | 2022-11-02 | 2023-09-22 | 东南大学 | Broad-spectrum curing agent and preparation method thereof |
| CN116143484A (en) * | 2022-11-11 | 2023-05-23 | 昆明理工大学 | Mine filling material based on coal gas slag, and preparation method and application thereof |
| CN116003055A (en) * | 2022-12-22 | 2023-04-25 | 陕西碳提取节能环保科技(集团)有限公司 | Coal chemical industry gasification slag coal gangue backfill and preparation method thereof |
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