CN113493336B - Preparation method of fly ash-slag-based cemented filling material - Google Patents
Preparation method of fly ash-slag-based cemented filling material Download PDFInfo
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- CN113493336B CN113493336B CN202010270377.4A CN202010270377A CN113493336B CN 113493336 B CN113493336 B CN 113493336B CN 202010270377 A CN202010270377 A CN 202010270377A CN 113493336 B CN113493336 B CN 113493336B
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- 239000000463 material Substances 0.000 title claims abstract description 42
- 238000011049 filling Methods 0.000 title claims abstract description 35
- 239000002893 slag Substances 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 239000010881 fly ash Substances 0.000 claims abstract description 59
- 239000002245 particle Substances 0.000 claims abstract description 35
- 239000002699 waste material Substances 0.000 claims abstract description 25
- 239000003245 coal Substances 0.000 claims abstract description 24
- 239000000843 powder Substances 0.000 claims abstract description 19
- 239000002002 slurry Substances 0.000 claims abstract description 19
- 238000003756 stirring Methods 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000000227 grinding Methods 0.000 claims abstract description 14
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 239000000292 calcium oxide Substances 0.000 claims description 17
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 17
- 239000011435 rock Substances 0.000 claims description 9
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 8
- 238000005303 weighing Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 6
- 239000010878 waste rock Substances 0.000 claims description 5
- 238000012216 screening Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 abstract description 6
- 239000004568 cement Substances 0.000 abstract description 3
- 239000010419 fine particle Substances 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 239000002440 industrial waste Substances 0.000 description 6
- 238000010298 pulverizing process Methods 0.000 description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- 229910052681 coesite Inorganic materials 0.000 description 4
- 229910052593 corundum Inorganic materials 0.000 description 4
- 229910052906 cristobalite Inorganic materials 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000036571 hydration Effects 0.000 description 4
- 238000006703 hydration reaction Methods 0.000 description 4
- 238000005065 mining Methods 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 229910052682 stishovite Inorganic materials 0.000 description 4
- 229910052905 tridymite Inorganic materials 0.000 description 4
- 229910001845 yogo sapphire Inorganic materials 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000012190 activator Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 239000011575 calcium Substances 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
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000011268 mixed slurry Substances 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000005406 washing Methods 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
- C04B28/02—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 OR ROCK 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Processing Of Solid Wastes (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a preparation method of a fly ash-slag-based cemented filling material, belonging to the field of mine filling materials. The preparation method of the fly ash-slag-based cemented filling material comprises the following steps: (1) crushing the massive gangue into fine particles of 0-1mm and 1-2mm, wherein the proportion of the particles of 0-1mm is more than 60%; (2) putting the mixture of the slag and the fly ash into a high-speed grinding machine, and grinding for 20-30 min to obtain slag-fly ash micro powder; (3) mixing waste hot water of a thermal power plant with slag-fly ash micro powder at the temperature of more than 20 ℃ according to the weight ratio of 1: (2-2.5) mixing and stirring for 1-4 h to prepare slag-fly ash gelled slurry; (4) and (3) mixing the screened gangue fine particles with the slag-fly ash gelled slurry according to the ratio of (35-40) to (60-65), and uniformly stirring to prepare the coal mine cemented filling material. The cement filling material prepared by the invention does not need to be added with an exciting agent, and has lower cost and better environmental protection.
Description
Technical Field
The invention relates to the field of mine filling materials, in particular to a preparation method of a fly ash-slag-based cemented filling material.
Background
With the rapid development of coal-electricity integration, many thermal power plants are built near coal mines in order to ensure the coal supply of the thermal power plants and save the cost of coal transportation and storage.
A large amount of industrial wastes such as fly ash and waste heat (including cooling water, high-temperature flue gas, high-temperature steam and the like) are generated in the operation process of the thermal power plant, wherein the cooling water of the thermal power plant is generally 20-50 ℃, and the utilization rate is not high due to low thermal level.
Coal mining forms a goaf, so that an overlying rock stratum is broken and collapsed, an aquifer and the earth surface are damaged, and water resource loss, building damage, vegetation damage and other adverse effects are caused; a large amount of waste rocks are generated in the coal mining and washing processes, and the waste rocks are accumulated on the ground surface, so that the waste rocks occupy cultivated land, pollute soil and atmosphere and seriously damage the ecological environment.
In recent years, some experts and scholars prepare cemented filling materials by taking cement, or wastes with potential pozzolanic activity such as slag, fly ash and steel slag as cementing materials and aggregates such as gangue, tailings and construction waste to perform coal mine filling mining, and fill industrial wastes into a goaf, so as to achieve the purpose of reducing damage to ecological environment caused by industrial wastes and coal mining. However, the cement is used as a cementing material, so that the coal mine filling cost is obviously increased, and the large-area popularization and application are not facilitated; when the slag, the fly ash and the steel slag are used as cementing materials, alkali activators such as sodium hydroxide, water glass and calcium sulfate need to be added in a certain proportion to excite the activity of the materials, the activators are expensive, the coal mine filling cost is increased, and certain pollution is caused to the underground environment by some alkali activators; therefore, the continuous exploration of cheaper and more environment-friendly coal mine cemented filling materials is very important for realizing green sustainable development of coal mine enterprises.
Disclosure of Invention
Based on the analysis, the invention aims to provide a preparation method of a fly ash-slag-based cemented filling material, which is used for solving the defects of high cost and poor environmental protection of a coal mine cemented filling material in the prior art.
In order to solve the technical problem, the invention provides a preparation method of a fly ash-slag-based cemented filling material, which comprises the following steps.
(1) Firstly, a crusher is utilized to crush large waste rocks, crushed waste rock particles are sieved into particles with the particle size of 0-1mm and 1-2mm through a screen, wherein the proportion of the particles with the particle size of 0-1mm is more than 60%, and the particles are reserved.
(2) Placing the mixture of the slag and the fly ash into a high-speed grinding machine, and grinding for 20-30 min, wherein the grinding method comprises the following steps: and grinding for 5min, and stopping for 1-2 min to obtain slag-fly ash micro powder.
In the mixture of the slag and the fly ash, the proportion of the slag is 45-49%, and the proportion of the fly ash is 51-55%.
The slag mainly comprises CaO and Al2O3、SiO2、MgO。
The CaO content of the fly ash is not less than 25 percent, wherein the free calcium oxide (f-CaO) content is not less than 5 percent.
The rotating speed of the high-speed pulverizer is more than 5000r/min, and the discharging fineness is below 10 um.
(3) And (3) putting the waste hot water of the thermal power plant into a heat-insulating barrel, adding the slag-fly ash micro powder ground in the step (2) into the heat-insulating barrel, and stirring for 1-4 h at the stirring speed of 30r/min to prepare slag-fly ash gelled slurry.
The weight ratio of the slag-fly ash micro powder to waste hot water of a thermal power plant is (2-2.5): 1.
the temperature of the waste hot water of the thermal power plant is not lower than 20 degrees.
(4) And (3) adding the gangue particles of 0-1mm and 1-2mm sieved in the step (1) into the slag-fly ash gelled slurry prepared in the step (3), and uniformly stirring to prepare the coal mine cemented filling material.
The weight ratio of the gangue particles to the slag-fly ash gelled slurry is (35-40) to (60-65).
The principle of the invention is as follows: the fly ash contains a certain amount of free calcium oxide (f-CaO), the slag and the fly ash are mixed and ground by a pulverizer, and the free calcium oxide (f-CaO) activity in the fly ash is excited by continuous friction and temperature rise between materials and between the materials and a pulverizer in the grinding process so that the materials and the pulverizer are more easily hydrated to generate Ca (OH)2Meanwhile, the ground slag-fly ash micro powder has finer granularity and larger specific surface area, and is easier to hydrate in a slightly alkaline solution; in addition, the ground slag-fly ash mixture aqueous solution is heated, so that the hydration degree of free calcium oxide (f-CaO) and slag-fly ash micro powder can be further increased, the hydration products of the slag micro powder and the fly ash micro powder can mutually promote the hydration of each other, more calcium silicate hydrate gel is generated, and the slag-fly ash slurry has certain gelling property; the slag-fly ash mixture slurry with the gelling property and the gangue fine particles are mixed according to a certain proportion, so that the coal mine cemented filling material which is cheaper and more environment-friendly can be produced.
Compared with the prior art, the invention has the following beneficial effects.
The method adopts slag, fly ash, gangue and waste hot water of a thermal power plant as raw materials to prepare the coal mine cemented filling material, all the materials are industrial wastes, the recycling efficiency of the industrial wastes is effectively improved, and the pollution of the industrial wastes to the ecological environment is reduced; the invention fully utilizes the regional advantages of coal-electricity integration, and comprehensively utilizes the fly ash, the waste hot water and the coal mine gangue of a thermal power plant, thereby further reducing the raw material storage and transportation cost of the coal mine filling material.
Secondly, the hydration degree of the slag-fly ash micro powder is improved by using the waste hot water of the thermal power plant, the gelatinization property of the slag-fly ash mixed slurry is further excited, and a new way is opened for the utilization of low-grade waste heat of the thermal power plant.
The coal mine cemented filling material prepared by the invention does not need to add an excitant, not only can greatly reduce the coal mine filling cost, but also reduces the pollution of the excitant to the mine environment, and is safer and more environment-friendly.
Detailed Description
The present invention will be described in detail below by way of examples.
Example 1.
(1) Firstly, crushing large waste rocks by using a crusher, and screening crushed waste rock particles into particles of 0-1mm and 1-2mm by using a screen, wherein the proportion of the particles of 0-1mm is 62% for later use.
(2) Weighing 45Kg of slag and 55Kg of fly ash, mixing and then putting into a high-speed pulverizer for pulverizing for 20min, wherein the pulverizing method comprises the following steps: grinding for 5min, stopping for 1 min; and obtaining slag-fly ash micro powder.
The slag mainly comprises CaO and Al2O3、SiO2、MgO。
The content of CaO in the fly ash is 28 percent, and the content of free calcium oxide (f-CaO) is 5.4 percent.
The rotating speed of the high-speed pulverizer is 5100r/min, and the discharging fineness is 5-10 um.
(3) And (3) putting 50Kg of waste hot water at 25 ℃ of a thermal power plant into a heat-insulating barrel, adding the slag-fly ash micro powder ground in the step (2) into the heat-insulating barrel, and stirring for 1h at the stirring speed of 30r/min to prepare slag-fly ash gelled slurry.
(4) And (3) weighing 100Kg of gangue particles which are sieved in the step (1) and have the particle size of 0-1mm and 1-2mm, adding the gangue particles into the slag-fly ash gelled slurry prepared in the step (3), and uniformly stirring to prepare the coal mine cemented filling material.
Table 1 shows the performance criteria for the cementitious fill material prepared in example 1.
TABLE 1
Example 2.
(1) Firstly, crushing large waste rocks by using a crusher, and screening crushed waste rock particles into particles of 0-1mm and 1-2mm by using a screen, wherein the proportion of the particles of 0-1mm is 65% for later use.
(2) Weighing 47Kg of slag and 53Kg of fly ash, mixing and putting into a high-speed pulverizer, and pulverizing for 25min, wherein the pulverizing method comprises the following steps: grinding for 5min, stopping for 1 min; obtaining slag-fly ash micro powder.
The slag mainly comprises CaO and Al2O3、SiO2、MgO。
The CaO content of the fly ash is 30.5 percent, wherein the free calcium oxide (f-CaO) content is 5.8 percent.
The rotating speed of the high-speed pulverizer is 5200r/min, and the discharging fineness is 2-6 um.
(3) Weighing 47.6Kg of waste hot water of 30 ℃ of a thermal power plant, placing the waste hot water in a heat-insulating barrel, adding the slag-fly ash micro powder ground in the step (2) into the heat-insulating barrel, and stirring for 2.5 hours at the stirring speed of 30 times/min to prepare slag-fly ash gelled slurry.
(4) And (2) weighing 90.5Kg of gangue particles which are sieved in the step (1) and have the particle size of 0-1mm and 1-2mm, adding the gangue particles into the slag-fly ash gelled slurry prepared in the step (3), and uniformly stirring to prepare the coal mine cemented filling material.
Table 2 shows the performance criteria for the cementitious fill material prepared in example 2.
TABLE 2
Example 3.
(1) Firstly, crushing large waste rocks by using a crusher, and screening crushed waste rock particles into particles with the particle size of 0-1mm and 1-5mm by using a screen, wherein the proportion of the particles with the particle size of 0-1mm is 67% for later use.
(2) Weighing 49Kg of slag and 51Kg of fly ash, mixing and putting into a high-speed pulverizer, and pulverizing for 30min, wherein the pulverizing method comprises the following steps: grinding for 5min, stopping for 2 min; obtaining slag-fly ash micro powder.
The slag mainly comprises CaO and Al2O3、SiO2、MgO。
The CaO content of the fly ash is 35.7 percent, wherein the free calcium oxide (f-CaO) content is 6.4 percent.
The rotating speed of the high-speed pulverizer is larger than 5200r/min, and the discharging fineness is 2-5 um.
(3) And (3) putting 44.4Kg of waste hot water of 40 ℃ of a thermal power plant into a heat-insulating barrel, adding the slag-fly ash micro powder ground in the step (2) into the heat-insulating barrel, and stirring for 3h at the stirring speed of 30r/min to prepare slag-fly ash gelled slurry.
(4) And (3) weighing 77.8Kg of gangue particles with the size of 0-1mm and 1-5mm screened in the step (1), adding the gangue particles into the slag-fly ash gelled slurry prepared in the step (3), and uniformly stirring to prepare the coal mine cemented filling material.
Table 3 shows the performance criteria for the cementitious fill material prepared in example 3.
TABLE 3
In order to ensure that the cemented filling material slurry has better pipeline transportation performance, the slump of the filling material slurry is required to be not less than 180mm, and the bleeding rate is not more than 5%, as can be seen from the performance indexes of the cemented filling materials in the embodiments 1 to 3, the cemented filling material slurry meets the pipeline transportation requirement; in addition, the 28-day strength of the cemented filling material exceeds 1MPa, and the requirement of general mines on the strength of the filling material can be met.
Claims (3)
1. Firstly, crushing large waste rocks by using a crusher, and screening crushed waste rock particles into particles with the particle size of 0-1mm and 1-2mm by using a screen, wherein the proportion of the particles with the particle size of 0-1mm is more than 60 percent for standby; (2) placing the mixture of the slag and the fly ash into a high-speed grinding machine for grinding for 20-30 min, wherein the grinding method comprises the following steps: grinding for 5min, stopping for 1-2 min to obtain slag-fly ash micro powder; (3) weighing a proper amount of waste hot water of the thermal power plant, placing the waste hot water into a heat-insulating barrel, adding the slag-fly ash micro powder ground in the step (2) into the heat-insulating barrel, and stirring for 1-4 hours at the stirring speed of 30r/min to prepare slag-fly ash gelled slurry; (4) adding the gangue particles of 0-1mm and 1-2mm sieved in the step (1) into the slag-fly ash gelled slurry prepared in the step (3), and uniformly stirring to prepare a coal mine cemented filling material; wherein in the mixture of the slag and the fly ash, the mass ratio of the slag is 45-49%, and the mass ratio of the fly ash is 51-55%; the CaO content of the fly ash is not less than 25 percent, wherein the free calcium oxide (f-CaO) content is not less than 5 percent; the rotating speed of the high-speed pulverizer is more than 5000r/min, and the discharge fineness is below 10 mu m.
2. The preparation method of the fly ash-slag-based cemented filling material as claimed in claim 1, wherein the weight ratio of the slag-fly ash micro powder to the waste hot water of the thermal power plant is (2-2.5): 1, the temperature of the waste hot water of the thermal power plant is not lower than 20 ℃.
3. The method for preparing a fly ash-slag-based cemented filling material according to claim 1, wherein the weight ratio of the gangue particles to the slag-fly ash cementitious slurry is (35-40): (60-65).
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