CN116161940A - Coal-electricity solid waste high-concentration self-flowing filling material and preparation and application thereof - Google Patents
Coal-electricity solid waste high-concentration self-flowing filling material and preparation and application thereof Download PDFInfo
- Publication number
- CN116161940A CN116161940A CN202211716894.5A CN202211716894A CN116161940A CN 116161940 A CN116161940 A CN 116161940A CN 202211716894 A CN202211716894 A CN 202211716894A CN 116161940 A CN116161940 A CN 116161940A
- Authority
- CN
- China
- Prior art keywords
- filling material
- fly ash
- coal
- solid waste
- mass
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000463 material Substances 0.000 title claims abstract description 114
- 239000002910 solid waste Substances 0.000 title abstract description 29
- 238000002360 preparation method Methods 0.000 title abstract description 22
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000010440 gypsum Substances 0.000 claims abstract description 36
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 36
- 239000010881 fly ash Substances 0.000 claims abstract description 32
- 239000000292 calcium oxide Substances 0.000 claims abstract description 19
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910001868 water Inorganic materials 0.000 claims abstract description 15
- 230000005284 excitation Effects 0.000 claims abstract description 14
- 239000004568 cement Substances 0.000 claims abstract description 11
- 238000003756 stirring Methods 0.000 claims description 32
- 239000002002 slurry Substances 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 13
- 239000000654 additive Substances 0.000 claims description 9
- 230000000996 additive effect Effects 0.000 claims description 9
- 238000006477 desulfuration reaction Methods 0.000 claims description 9
- 239000011398 Portland cement Substances 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 8
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 8
- 239000002131 composite material Substances 0.000 claims description 8
- 230000023556 desulfurization Effects 0.000 claims description 8
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 claims description 6
- 239000008116 calcium stearate Substances 0.000 claims description 6
- 235000013539 calcium stearate Nutrition 0.000 claims description 6
- 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 description 5
- 239000011734 sodium Substances 0.000 claims description 5
- 229910052708 sodium Inorganic materials 0.000 claims description 5
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 4
- 239000001110 calcium chloride Substances 0.000 claims description 4
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 4
- 239000011780 sodium chloride Substances 0.000 claims description 4
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 4
- 235000019353 potassium silicate Nutrition 0.000 claims description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 2
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 2
- 230000003009 desulfurizing effect Effects 0.000 claims description 2
- 239000003546 flue gas Substances 0.000 claims description 2
- 239000006028 limestone Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 239000000945 filler Substances 0.000 claims 5
- 239000003245 coal Substances 0.000 description 20
- 230000000740 bleeding effect Effects 0.000 description 17
- 238000005065 mining Methods 0.000 description 11
- 239000000126 substance Substances 0.000 description 7
- 239000008399 tap water Substances 0.000 description 6
- 235000020679 tap water Nutrition 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 229910021536 Zeolite Inorganic materials 0.000 description 2
- 239000002956 ash Substances 0.000 description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000003469 silicate cement Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000010457 zeolite Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 244000058281 Ulmus pumila Species 0.000 description 1
- 235000001547 Ulmus pumila Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 229910052663 cancrinite Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- -1 pahalite Inorganic materials 0.000 description 1
- 230000003334 potential effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 238000009270 solid waste treatment Methods 0.000 description 1
- 238000006467 substitution reaction Methods 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
- C04B28/24—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 alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
-
- 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 provides a coal-electricity solid waste high-concentration self-flowing filling material, and preparation and application thereof, wherein the filling material comprises the following components in percentage by mass: desulfurized gypsum, 10-14% cementing excitation material, 35-43% fly ash by weight and 40-50% water; the cementing excitation material consists of quicklime and cement in a mass ratio of 1:1.05-1.2. The invention realizes the low-cost preparation of the medium-electric solid waste high-concentration cemented filling material by reasonably utilizing the two materials of the fly ash and the desulfurized gypsum, wherein the cost of the filling material per cubic meter is 85-115 yuan, and the 8h final setting of the filling material is realized by designing a formula, the 28d uniaxial compressive strength is stabilized at 1-6 MPa, the early strength is high, and the later strength is obviously increased; the material has good fluidity, can realize long-distance self-flow conveying of 15 times of lines, is very suitable for application in underground goaf, and has a roof grafting rate of more than 95%.
Description
Technical Field
The invention relates to the technical field of filling mining, in particular to a coal-electricity solid waste high-concentration self-flowing filling material, and preparation and application thereof.
Background
In the coal mining industry, the coal mining technology presents the phenomenon that the coal is difficult to mine by adopting a conventional caving method when the coal is pressed down by a building, and the coal electric solid waste filling mining technology is gradually pushed, and the filling mining is a coal mining method which feeds filling materials into a goaf along with the pushing of a coal mining working face so as to achieve the purpose of controlling the movement of rock stratum and the subsidence of earth surface. The coal-electricity solid waste mainly originates from thermal power generation, the thermal power plant is used as a main body of China energy industry, and the annual discharge of solid wastes such as fly ash, desulfurized gypsum and the like exceeds 4 multiplied by 10 7 t is an important source of pollution. At present, the solid waste treatment of the thermal power plant mainly adopts landfill and stacking modes, the occupied area is large, the environmental pressure is large, the treatment cost is high, the waste is serious, the recycling utilization only occupies about 30 percent, and if the coal can be pushed in a large rangeThe electric solid waste filling mining technology can not only greatly reduce the discharge amount of coal electric solid waste, but also recycle the 'three-lower' pressed coal, thereby realizing the purposes of saving resources and protecting environment.
In the prior art, the fly ash is used as a filling material, such as application numbers CN200810171974.0, CN201110023865.6, CN201110405857.8, CN201210081059.9, CN201210517862.2, CN201210557658.3, CN201210557761.8, CN201310284360.4, CN201310306381.1, CN201310347147.3, CN201310480909.7, CN201410035688.7 and the like, and most of the technologies use cement as a main cementing material, and are used for assisting in doping some fly ash, other gangue and tailing aggregate, and assisting in adding some additive, so that the whole system has good peace, fluidity, coagulation effect and strength index. Some patents also use a large amount of special cement, which is unfavorable for energy conservation, emission reduction and comprehensive waste utilization.
In the process of researching the filling material which takes the coal and electricity solid waste as the main raw material and is applied to coal mine filling exploitation, the invention discovers that the coal mine filling material generally requires the characteristics of pre-solidification (8 h final solidification), certain strength (1-6 MPa), low bleeding rate (within 3 percent) and good fluidity and workability in order to meet the normal production of the coal mine, so that the filling material can be applied on a large scale, and in particular, the high fluidity and the low bleeding rate are particularly important for the coal mine filling exploitation.
In view of this, the present invention has been proposed.
Disclosure of Invention
The invention provides a coal-electricity solid waste high-concentration self-flowing filling material and preparation and application thereof, which are used for solving the problem that various performance requirements are difficult to realize when the filling material for filling and opening a coal mine is prepared by taking coal-electricity solid waste as a main raw material, aiming at the characteristics of the filling material required by the coal mine, the self-flowing conveying of 15 times of lines can be realized by designing a specific formula to realize the developed filling material, the self-flowing filling material has good fluidity, good workability and good cementing property, can meet the self-flowing filling of filling and mining, and the two materials of the utilized fly ash and the desulfurized gypsum are industrial waste which are easy to obtain and are also required to be treated, so that the coal-electricity solid waste is treated on a large scale.
Specifically, the invention provides a filling material, which comprises the following components in percentage by mass: desulfurized gypsum, 10-14% cementing excitation material, 35-43% fly ash by weight and 40-50% water.
The cementing excitation material consists of quicklime and cement in a mass ratio of 1:1.05-1.2.
In the cemented filling, the fly ash can partially replace cement as a cementing material in an alkaline environment, the sulfate activity excitation effect of the desulfurization gypsum on the fly ash is fully utilized, the fly ash and the desulfurization gypsum are combined according to a proper proportion, and a small amount of cement clinker and quicklime with specific proportions are added to prepare a filling material taking coal-electricity solid waste as a main component, so that the mine filling cost is reduced, and the provided fly ash-desulfurization gypsum paste-like filling material solves the problem of unbalanced filling cost and mining benefit to a great extent. The added quicklime provides a system alkaline environment and excites the potential activity of the fly ash, has very important effect on improving the strength of the material and enabling the material to have low bleeding rate, and besides the activity of the fly ash can be excited by the desulfurized gypsum, the phenomena of caking and the like of the filling material in the self-flowing process are avoided, and the strength uniformity of the final filling material is ensured. The filling material of the invention can undergo the following series of reactions in the process of batching and application, thereby generating reaction products mainly comprising calcium aluminate hydrate, sodium zeolite, calcium zeolite, cancrinite, pahalite, gypsum, hydrated calcium silicate, ettringite and the like:
CaO+H 2 O→Ca(OH) 2
3(CaO·Al 2 O 3 )+6H 2 O→3CaO·Al 2 O 3 ·6H 2 O
2(2CaO·SiO 2 )+4H 2 O→3CaO·2SiO 2 ·3H 2 O+Ca(OH) 2
3CaO·Al 2 O 3 +3CaSO 4 +32H 2 O→3CaO·Al 2 O 3 ·3CaSO 4 ·32H 2 O
according to the filling material provided by the invention, the mass ratio of the desulfurized gypsum to the fly ash is 1:9-4; preferably, the mass fraction of the desulfurized gypsum is 5-12%.
According to the filling material provided by the invention, siO in the fly ash 2 The mass content is more than or equal to 50wt percent, al 2 O 3 The mass content is more than or equal to 20wt.%; the material can be raw ash or separation ash;
the desulfurization gypsum is desulfurization gypsum slurry with mass concentration of 25% -30% generated by desulfurizing boiler flue gas by lime-limestone slurry or dehydrated desulfurization gypsum.
According to the filling material provided by the invention, the cement is silicate cement, preferably PC42.5 composite silicate cement, and preferably the quicklime is CL 85-QP quicklime.
The filling material provided by the invention further comprises an additive, wherein the additive comprises more than one of sodium silicate, sodium carbonate, sodium chloride, sodium metaaluminate, calcium chloride and calcium stearate. In the test, the addition of a proper amount of additive is beneficial to improving the conveying performance of the filling material.
According to the filling material provided by the invention, the mass fraction of the additive is 0.2-0.5%.
The invention also provides a preparation method of the filling material.
According to the preparation method of the filling material provided by the invention, fly ash, desulfurized gypsum and water are firstly subjected to primary stirring according to a proportion to form primary slurry, and then secondary stirring is performed, and meanwhile, a cementing excitation material is added to form the filling material.
The stirring time of the primary stirring can be 2-3 min.
The stirring time of the secondary stirring can be 1-2 min.
According to the preparation method of the filling material provided by the invention, the additive is added into the primary pulp in proportion.
The invention also provides the use of a filling material in an underground goaf, comprising self-flowing the filling material as described above into the goaf.
The invention provides a coal-electricity solid waste high-concentration self-flowing filling material, which realizes the low-cost preparation of the coal-electricity solid waste high-concentration cemented filling material by reasonably utilizing two materials, namely fly ash and desulfurized gypsum, wherein the cost of the filling material per cubic meter is 85-115 yuan, and the 8-hour final setting of the filling material is realized by designing a formula, the 28d uniaxial compressive strength is stabilized at 2-6 MPa, the early strength is high, and the later strength is obviously increased.
The high-concentration self-flowing filling material for the coal-electricity solid waste has good material fluidity, can realize long-distance self-flowing conveying of 15 times of lines, is very suitable for application in underground goaf, and has a roof connection rate of more than 95%.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a process flow of preparing the filling material provided by the invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The specific techniques or conditions are not identified in the examples and are described in the literature in this field or are carried out in accordance with the product specifications. The reagents or equipment used were conventional products available for purchase by regular vendors without the manufacturer's attention.
The following describes a coal-electricity solid waste high-concentration self-flowing filling material and preparation and application thereof with reference to fig. 1.
Example 1
A preparation method of a coal-electricity solid waste high-concentration self-flowing filling material is shown in figure 1, and comprises the following steps:
(1) Preparing materials, including: zhao Danpan power plant III-level fly ash, desulfurized gypsum, CL 85-QP quicklime, PC42.5 composite Portland cement, water glass additive and tap water, wherein the mass percentages of the substances are as follows: 35%, 12%, 6%, 5.5%, 0.5% and 41%.
(2) Firstly, fly ash, desulfurized gypsum, water glass and water are subjected to primary stirring in a primary stirring tank for 2min according to a proportion to form primary slurry, and then, the primary slurry is subjected to secondary stirring in a secondary stirring tank for 1min, and meanwhile, cementing excitation materials are added to form the filling material.
The initial fluidity of the filling material is 390mm, the fluidity of 30min is 370mm, and the density of slurry is 1.538t/m 3 The initial setting time is 4 hours, the final setting time is 5.5 hours, the bleeding rate is 0%, and the 28d uniaxial compressive strength is 5.5MPa.
Example 2
The preparation method of the coal-electricity solid waste high-concentration self-flowing filling material comprises the following steps:
(1) Preparing materials, including: zhao Danpan power plant III-level fly ash, desulfurized gypsum, CL 85-QP quicklime, PC42.5 composite Portland cement, sodium carbonate, calcium chloride and tap water, wherein the mass percentages of the substances are as follows: 43%, 5%, 6%, 5.5%, 0.2%, 0.3% and 40%.
(2) Firstly, fly ash, desulfurized gypsum, sodium carbonate, calcium chloride and water are subjected to primary stirring in a primary stirring tank for 2min to form primary slurry, and then subjected to secondary stirring in a secondary stirring tank for 1min, and meanwhile, cementing excitation materials are added to form the filling material.
The initial fluidity of the filling material is 385mm, the fluidity of 30min is 370mm, and the slurry density is 1.537t/m 3 The initial setting time is 3.5 hours, the final setting time is 5 hours, the bleeding rate is 0%, and the 28d uniaxial compressive strength is 6.2MPa.
Example 3
The preparation method of the coal-electricity solid waste high-concentration self-flowing filling material comprises the following steps:
(1) Preparing materials, including: the method comprises the following steps of (by mass percent) level III fly ash of a lateral power plant of Ulmus pumila, desulfurized gypsum, CL 85-QP quicklime, PC42.5 composite Portland cement, sodium chloride and tap water: 35%, 5%, 6%, 5%, 0.2% and 48.8%.
(2) Firstly, fly ash, desulfurized gypsum, sodium chloride and water are subjected to primary stirring in a primary stirring tank for 2min according to a proportion to form primary slurry, and then, the primary slurry is subjected to secondary stirring in a secondary stirring tank for 1min, and meanwhile, cementing excitation materials are added to form the filling material.
The initial fluidity of the filling material is 485mm, the fluidity of 30min is 470mm, and the density of slurry is 1.437t/m 3 The initial setting time is 5.5 hours, the final setting time is 7 hours, the bleeding rate is 3%, and the 28d uniaxial compressive strength is 2.6MPa.
Example 4
The preparation method of the coal-electricity solid waste high-concentration self-flowing filling material comprises the following steps:
(1) Preparing materials, including: the method comprises the following steps of (by mass percent) preparing III-grade fly ash, desulfurized gypsum, CL 85-QP quicklime, PC42.5 composite Portland cement, sodium metaaluminate and tap water from a large-earth-river thermal power plant, wherein the mass percent of each substance is as follows: 35%, 10%, 6%, 5%, 0.5%, and 43.5%.
(2) Firstly, carrying out primary stirring on fly ash, desulfurized gypsum, sodium metaaluminate and water in a primary stirring tank according to a proportion for 2min to form primary slurry, and then carrying out secondary stirring in a secondary stirring tank for 1min, and simultaneously adding a cementing excitation material to form a filling material.
The initial fluidity of the filling material is 425mm, the fluidity of 30min is 410mm, and the density of slurry is 1.447t/m 3 The initial setting time is 5.5 hours, the final setting time is 7 hours, the bleeding rate is 1%, and the 28d uniaxial compressive strength is 3.8MPa.
Example 5
The preparation method of the coal-electricity solid waste high-concentration self-flowing filling material comprises the following steps:
(1) Preparing materials, including: the method comprises the following steps of (by mass percent) preparing III-grade fly ash, desulfurized gypsum, CL 85-QP quicklime, PC42.5 composite Portland cement, calcium stearate and tap water from a large-soil-river thermal power plant, wherein the mass percent of each substance is as follows: 35%, 10%, 6%, 5%, 0.5%, and 43.5%.
(2) Firstly, carrying out primary stirring on fly ash, desulfurized gypsum, calcium stearate and water in a primary stirring tank according to a proportion for 2min to form primary slurry, and then carrying out secondary stirring in a secondary stirring tank for 1min, and simultaneously adding cementing excitation material to form the filling material.
The initial fluidity of the filling material is 425mm, the fluidity of 30min is 410mm, and the density of slurry is 1.445t/m 3 The initial setting time is 5.5 hours, the final setting time is 7 hours, the bleeding rate is 1%, and the 28d uniaxial compressive strength is 3.6MPa.
Example 6
The preparation method of the coal-electricity solid waste high-concentration self-flowing filling material comprises the following steps:
(1) Preparing materials, including: the method comprises the following steps of (by mass percent) preparing III-grade fly ash of a large-soil-river thermal power plant, 28% mass concentration desulfurized gypsum slurry, CL 85-QP quicklime, PC42.5 composite Portland cement, calcium stearate and tap water, wherein the mass percent of each substance is as follows: 35%, 18%, 6%, 5%, 0.5%, and 35.8%.
(2) Firstly, carrying out primary stirring on fly ash, desulfurized gypsum slurry, calcium stearate and water in a primary stirring tank according to a proportion for 2min to form primary slurry, and then carrying out secondary stirring in a secondary stirring tank for 1min, and simultaneously adding cementing excitation material to form the filling material.
The initial fluidity of the filling material is 483mm, the fluidity of 30min is 468mm, and the density of slurry is 1.437t/m 3 The initial setting time is 5.8 hours, the final setting time is 7 hours, the bleeding rate is 3%, and the 28d uniaxial compressive strength is 2.7MPa.
Comparative example 1
The preparation method of the coal-electricity solid waste high-concentration self-flowing filling material is basically the same as that of the embodiment 1, and the only difference is that: the mass ratio of the substances except water is kept unchanged, and the adding amount of the water is increased to 55%.
The initial fluidity of the obtained filling material is 493mm, the fluidity of 30min is 478mm, and the slurry density is 1.417t/m 3 The initial setting time is 7h, the final setting time is 12.4h, the bleeding rate is 8%, and the 28d uniaxial compressive strength is 1.3MPa. The material has longer final setting time (more than 8 hours), lower strength (28 d uniaxial compressive strength is less than 2 MPa) and higher bleeding rate (more than 3%).
Comparative example 2
The preparation method of the coal-electricity solid waste high-concentration self-flowing filling material is basically the same as that of the embodiment 1, and the only difference is that: the mass ratio of substances except water is kept unchanged, and the adding amount of water is reduced to 35%.
The initial fluidity of the obtained filling material is 120mm, the fluidity of 30min is 108mm, and the density of slurry is 1.732t/m 3 The initial setting time is 3h, the final setting time is 4.3h, the bleeding rate is 0%, and the 28d uniaxial compressive strength is 7.4MPa. The fluidity and expansibility of the material are poor (the fluidity is less than 290 mm), and the self-flow conveying can not be satisfied.
Comparative example 3
The preparation method of the coal-electricity solid waste high-concentration self-flowing filling material is basically the same as that of the embodiment 1, and the only difference is that: the mass ratio of the quicklime to the cement is 1:0.8.
The initial fluidity of the obtained filling material is 395mm, the fluidity of 30min is 374mm, the initial setting time is 4h, the final setting time is 5.5h, the bleeding rate is 5%, and the 28d uniaxial compressive strength is 5.4MPa. The bleeding rate of the material is larger (more than 3 percent), and the filling requirement of the coal mine cannot be met.
Comparative example 4
The preparation method of the coal-electricity solid waste high-concentration self-flowing filling material is basically the same as that of the embodiment 1, and the only difference is that: the mass ratio of the quicklime to the cement is 1:1.3.
The initial fluidity of the obtained filling material is 230mm, the fluidity of 30min is 214mm, the initial setting time is 3h, the final setting time is 4.5h, the bleeding rate is 0%, and the 28d uniaxial compressive strength is 5.6MPa. The fluidity of the material is poor (the fluidity is less than 290 mm), and the self-flowing filling requirement of the coal mine cannot be met.
It can be seen that the filling material provided by the invention can meet the filling mining requirements (28 d uniaxial compressive strength is 2-6 MPa, bleeding rate is less than 3%) of most coal mines, and meanwhile, the material fluidity is more than 290mm, so that the self-flowing conveying of more than 15 times of lines can be realized. The filling material has the advantages of simple preparation, low energy consumption in transportation, low bleeding rate, high roof grafting rate and the like.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A filler material, characterized by comprising, in mass fractions: desulfurized gypsum, 10-14% cementing excitation material, 35-43% fly ash by weight and 40-50% water;
the cementing excitation material consists of quicklime and cement in a mass ratio of 1:1.05-1.2.
2. The filling material according to claim 1, wherein the mass ratio of the desulfurized gypsum to the fly ash is 1:9-4; preferably, the mass fraction of the desulfurized gypsum is 5-12%.
3. The filler material of claim 1, wherein the fly ash is comprised of SiO 2 The mass content is more than or equal to 50wt percent, al 2 O 3 The mass content is more than or equal to 20wt.%;
the desulfurization gypsum is desulfurization gypsum slurry with mass concentration of 25% -30% generated by desulfurizing boiler flue gas by lime-limestone slurry or dehydrated desulfurization gypsum.
4. The filling material according to claim 1, wherein the cement is portland cement, preferably PC42.5 composite portland cement, preferably the quicklime is CL 85-QP quicklime.
5. The filling material according to claim 1, further comprising an additive comprising one or more of water glass, sodium carbonate, sodium chloride, sodium metaaluminate, calcium chloride, and calcium stearate.
6. The filling material according to claim 5, wherein the mass fraction of the additive is 0.2 to 0.5%.
7. A method for producing the filler according to any one of claims 1 to 6.
8. The method of claim 7, wherein the filler is formed by first stirring fly ash, desulfurized gypsum and water in a ratio to form a primary slurry, and then performing a secondary stirring while adding a cementitious stimulus.
9. The method of preparing a filler material of claim 8, wherein the admixture is added in proportion to the primary slurry.
10. Use of a filling material according to any one of claims 1 to 6 in an underground goaf, comprising self-conveying the filling material to the goaf.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211716894.5A CN116161940A (en) | 2022-12-29 | 2022-12-29 | Coal-electricity solid waste high-concentration self-flowing filling material and preparation and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211716894.5A CN116161940A (en) | 2022-12-29 | 2022-12-29 | Coal-electricity solid waste high-concentration self-flowing filling material and preparation and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116161940A true CN116161940A (en) | 2023-05-26 |
Family
ID=86419327
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211716894.5A Pending CN116161940A (en) | 2022-12-29 | 2022-12-29 | Coal-electricity solid waste high-concentration self-flowing filling material and preparation and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116161940A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1640845A (en) * | 2004-01-09 | 2005-07-20 | 上海市建筑科学研究院 | Concrete cementing material using desulfurized gypsum as accelerator |
| DE202005015134U1 (en) * | 2005-09-24 | 2005-12-01 | GFR Gesellschaft für die Aufbereitung und Verwertung von Reststoffen mbH | Hydraulically-transportable, self-leveling mine backfilling material, used for filling underground rock salt caverns, contains residue from (quasi)dry flue gas desulfurization of coal-fired power station plus binder, salt and mixing water |
| CN101549986A (en) * | 2009-03-27 | 2009-10-07 | 长沙理工大学 | Fly ash-desulfuration gypsum- concrete self-expandable anti-crack dry powder mortar and method of preparing the same |
| CN102815963A (en) * | 2012-09-14 | 2012-12-12 | 淄博矿业集团有限责任公司 | High-water-content micro-expansion filling material composition |
| CN111153667A (en) * | 2019-11-29 | 2020-05-15 | 天津渤化永利化工股份有限公司 | Formula of desulfurized gypsum fly ash cementing material |
| CN112759346A (en) * | 2021-01-12 | 2021-05-07 | 北京科技大学 | Underground goaf filling material and preparation method and application thereof |
| CN114213046A (en) * | 2021-12-31 | 2022-03-22 | 徐州中矿大贝克福尔科技股份有限公司 | Clinker-free coal ash composite cementing material, preparation method thereof and coal mine filling paste |
-
2022
- 2022-12-29 CN CN202211716894.5A patent/CN116161940A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1640845A (en) * | 2004-01-09 | 2005-07-20 | 上海市建筑科学研究院 | Concrete cementing material using desulfurized gypsum as accelerator |
| DE202005015134U1 (en) * | 2005-09-24 | 2005-12-01 | GFR Gesellschaft für die Aufbereitung und Verwertung von Reststoffen mbH | Hydraulically-transportable, self-leveling mine backfilling material, used for filling underground rock salt caverns, contains residue from (quasi)dry flue gas desulfurization of coal-fired power station plus binder, salt and mixing water |
| CN101549986A (en) * | 2009-03-27 | 2009-10-07 | 长沙理工大学 | Fly ash-desulfuration gypsum- concrete self-expandable anti-crack dry powder mortar and method of preparing the same |
| CN102815963A (en) * | 2012-09-14 | 2012-12-12 | 淄博矿业集团有限责任公司 | High-water-content micro-expansion filling material composition |
| CN111153667A (en) * | 2019-11-29 | 2020-05-15 | 天津渤化永利化工股份有限公司 | Formula of desulfurized gypsum fly ash cementing material |
| CN112759346A (en) * | 2021-01-12 | 2021-05-07 | 北京科技大学 | Underground goaf filling material and preparation method and application thereof |
| CN114213046A (en) * | 2021-12-31 | 2022-03-22 | 徐州中矿大贝克福尔科技股份有限公司 | Clinker-free coal ash composite cementing material, preparation method thereof and coal mine filling paste |
Non-Patent Citations (1)
| Title |
|---|
| 杨宝贵 等: "煤矿新型胶凝充填材料配比试验及水化机理研究", 矿业科学学报, vol. 2, no. 5, 15 October 2017 (2017-10-15), pages 475 - 481 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11884589B2 (en) | Settable compositions comprising remediated coal ash and methods of cementing in subterranean formations | |
| CN113831036B (en) | High-free calcium oxide solid waste base gelling material and preparation and application thereof | |
| JP2022070235A (en) | C30 grade all solid waste concrete and preparation method thereof | |
| CN111187045B (en) | Mine underground filling mortar prepared from steel slag sand and mineral processing waste | |
| CN113292305A (en) | Alkali-activated high-water mine filling material based on multiple solid waste synergies and preparation method thereof | |
| CN114940600B (en) | Full-solid waste filling material and preparation method thereof | |
| CN110746165A (en) | Ocean engineering repair mortar and preparation method thereof | |
| CN101074149B (en) | Method for producing cement with little clinker by oil shale flyash | |
| CN113336516A (en) | Cementing material prepared from multi-element solid wastes and cooperative regulation and control method thereof | |
| CN107619249A (en) | Mine filling material and preparation method thereof | |
| CN102199010A (en) | Hydraulic composite cementing system mainly containing non-calcined desulphurization gypsum | |
| CN113045226A (en) | Low-cost solid waste base cementing material | |
| CN115340308B (en) | Pretreatment method of industrial solid waste and application of solid waste in preparation of cementing material | |
| CN114591061B (en) | Low-carbon road concrete with steel slag as aggregate and preparation method thereof | |
| CN105294154A (en) | High-recycling steam pressurized concrete block and preparation method thereof | |
| CN110668739A (en) | Tailing cemented filling material and preparation method thereof | |
| CN113800859A (en) | Special cementing powder for full-tailings cementing filling and preparation method thereof | |
| CN114940591A (en) | Cementing material for curing high-water-content tailings | |
| CN111233382A (en) | Filling material using mineral processing tailings and filling process thereof | |
| CN1100076A (en) | Mine full-water quick-setting cemented filling composite material | |
| Chen et al. | Effect of coal gangue with different kaolin contents on compressive strength and pore size of blended cement paste | |
| CN116161940A (en) | Coal-electricity solid waste high-concentration self-flowing filling material and preparation and application thereof | |
| CN115403312B (en) | High-sulfur tailing cementing material and preparation method and application thereof | |
| CN111499236A (en) | Production method for preparing portland cement by using large-amount fly ash and chemical gypsum | |
| CN111517689A (en) | High-efficiency fly ash activator and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |