CN113060983A - Preparation method of large-volume fly ash unfired lightweight aggregate - Google Patents
Preparation method of large-volume fly ash unfired lightweight aggregate Download PDFInfo
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- CN113060983A CN113060983A CN202110549128.3A CN202110549128A CN113060983A CN 113060983 A CN113060983 A CN 113060983A CN 202110549128 A CN202110549128 A CN 202110549128A CN 113060983 A CN113060983 A CN 113060983A
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- fly ash
- lightweight aggregate
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- 239000010881 fly ash Substances 0.000 title claims abstract description 56
- 238000002360 preparation method Methods 0.000 title claims description 4
- 239000004568 cement Substances 0.000 claims abstract description 23
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 15
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000001035 drying Methods 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims description 18
- 239000002994 raw material Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 8
- 239000008188 pellet Substances 0.000 claims description 7
- 239000004005 microsphere Substances 0.000 claims 1
- 239000004567 concrete Substances 0.000 abstract description 10
- 238000010276 construction Methods 0.000 abstract description 10
- 239000010883 coal ash Substances 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000004064 recycling Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 7
- 238000011161 development Methods 0.000 description 5
- 239000002910 solid waste Substances 0.000 description 4
- 239000004566 building material Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000011372 high-strength concrete Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 229910052905 tridymite Inorganic materials 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
-
- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/0277—Hardening promoted by using additional water, e.g. by spraying water on the green concrete element
-
- 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
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Processing Of Solid Wastes (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the field of application of fly ash. A process for preparing the non-sintered light aggregate containing powdered coal ash includes proportionally mixing powdered coal ash with cement, granulating by adding water glass, drying, and watering at ordinary temp. The lightweight aggregate concrete is used for construction to reduce the self weight of the concrete, and has particularly obvious effect of reducing foundation load for structures with large span, high floors and the like, thereby reducing construction cost, reducing construction budget, increasing economic benefit and providing an excellent way for recycling the fly ash discharged by coal-fired power plants for many years.
Description
Technical Field
The invention relates to the field of application of fly ash.
Background
With the rapid development of social science and technology, the improvement of social productivity accelerates the development of modernization, and meanwhile, the ecological environment problem is brought. Particularly, the exploitation of a large amount of natural resources in the industrial field not only reduces the non-renewable resources, but also causes the accumulation of a large amount of solid wastes, occupies limited land resources and even causes secondary pollution. Therefore, the reasonable utilization of the solid waste according to the characteristics of the solid waste has important practical significance. The main components of the fly ash are SiO2 and Al2O3, and a small amount of Fe2O3, CaO, MgO and other trace elements. Therefore, the preparation of the building decoration material-lightweight aggregate with high added value by taking the fly ash as the main raw material and adding some chemical reagents has great significance. On one hand, the solid waste generated by coal burning is solved, on the other hand, the lightweight aggregate with high attached value is manufactured, so that resources are recycled, and a feasible scheme is provided for the future industrial development.
The building material lightweight aggregate has the characteristics of light volume weight, high strength, low heat conductivity coefficient, fire resistance, permeability resistance, sound absorption, good chemical stability and the like, can replace common sandstone to be used as the lightweight aggregate, has the phenomenon of floating of ceramsite in the current production, the ceramsite is mainly prepared by sintering clay which is used as a raw material, and the vast majority of the sources of the clay raw material are taken from cultivated land, so that the unreasonable utilization of cultivated land resources is caused, and therefore, the lightweight aggregate prepared by other methods has technical necessity.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the problem of coal ash accumulation is solved, and the coal ash is used as artificial aggregate in the construction industry to replace natural mining aggregate, so that the environment is protected, and the consumption of resources is reduced.
The technical scheme adopted by the invention is as follows: a process for preparing the non-sintered light aggregate containing powdered coal ash includes proportionally mixing powdered coal ash with cement, granulating by adding water glass, drying, and watering at ordinary temp.
The proportion of the fly ash and the cement is that the fly ash accounts for 30-70% of the mixture of the fly ash and the cement in an ampere mass percentage.
The proportion of the fly ash and the cement is 56.5 to 56.6 percent of the fly ash in the mixture of the fly ash and the cement in an ampere mass percentage.
According to the mass percentage, the mass of the water glass is 10-60% of the mass of the mixture of the fly ash and the cement.
According to the mass percentage, the mass of the water glass is 15.6-37.0% of the mass of the mixture of the fly ash and the cement. The mass percentage concentration of the water glass is 30-50%.
According to the mass percentage, the mass of the water is 10-60 percent of the total mass of the raw materials.
According to the mass percentage, the mass of the water is 17.8-20.6% of the total mass of the raw materials.
The particle size of the fly ash is less than 5mm, and the water content is less than 1% by mass percent.
The green pellet drying temperature was 60 ℃.
The particle size of the green pellets is 5mm-15 mm.
The room temperature watering maintenance refers to natural water spraying maintenance for about 28 days at room temperature, water is sprayed once every two to 3 days, and the water spraying amount is the same every time.
The invention has the beneficial effects that: the lightweight aggregate concrete is used for construction to reduce the self weight of the concrete, and has particularly obvious effect of reducing foundation load for structures with large span, high floors and the like, thereby reducing construction cost, reducing construction budget, increasing economic benefit and providing an excellent way for recycling the fly ash discharged by coal-fired power plants for many years.
Detailed Description
Examples
1. Drying the fly ash in a power plant to ensure that the moisture content is below 1%, screening by using a sieve with the aperture of 5mm, storing the materials with the particle size of less than 5mm to a laboratory for later use, grinding the materials with the particle size of more than 5mm by using a ball mill, and storing for later use;
2. the fly ash and the cement dry materials which are weighed in advance are poured into a vertical shaft stirrer to be stirred for 30 minutes, so that the dry materials are fully and uniformly mixed for next alkali excitation, a favorable environment is provided, and the components of the needed lightweight aggregate are weighed. The required raw materials are accurately weighed according to the formula, placed in a mixing tank provided with mixing balls, and mixed for 4 hours on a roller machine, and the raw materials (dry materials) are mainly uniformly mixed, so that the mixture can be fully reacted in the next procedure.
3. Adding water glass solution into the uniformly mixed raw materials, carrying out wet mixing for 5 minutes, then putting the mixture on a disc pelletizer with the diameter of 1m, preparing the mother balls, rotating at the speed of 8 revolutions per minute, and rolling for 3 minutes to obtain the mother balls with uniform size. And secondly, continuously adding a prepared water glass solution (the mass percentage is 45%) on the mother ball, continuously adding a mixture on the surface of the mother ball, rotating for 15 minutes to form green balls with different particle sizes, sieving with different mesh sieves of 5mm, 8mm, 10mm and 15mm respectively to select qualified green balls, wherein the whole time is 15 minutes, and placing the manufactured green balls in an environment at 60 ℃ for drying treatment. And (5) after drying, placing at room temperature, watering and maintaining.
4. The manufactured ball is subjected to performance detection, and the cylinder pressure strength and the bulk density are respectively measured for 1 day, 7 days and 28 days.
Adding water glass solution into the uniformly mixed raw materials, carrying out wet mixing for 5 minutes, then putting the mixture on a disc pelletizer with the diameter of 1m, preparing the mother balls, rotating at the speed of 8 revolutions per minute, and rolling for 3 minutes to obtain the mother balls with uniform size. And secondly, continuously adding a prepared water glass solution on the mother ball, continuously adding a mixture on the surface of the mother ball, rotating for 15 minutes to form green balls with different particle sizes, sieving by using different mesh sieves of 5mm, 8mm, 10mm and 15mm respectively, selecting qualified green balls, and naturally air-drying.
Light aggregate ingredient composition in examples Table 1 (in weight percent)
In table 1, the fly ash percentage refers to the mass percentage of fly ash in the mixture of fly ash and cement, the cement percentage refers to the mass percentage of cement in the mixture of fly ash and cement, the water glass percentage refers to the mass percentage of water glass in the mixture of fly ash and cement, and the water percentage refers to the mass percentage of water in the total mass of raw materials (including fly ash, cement and water glass).
TABLE 2 indexes of mechanical and physicochemical properties of the lightweight aggregate obtained in the example
As can be seen from Table 2, in this example, a large proportion of fly ash is mainly used in combination with a certain amount of cementing material to prepare lightweight aggregate with excellent performance, the compression strength is 1.68MPa, and the density is 2.15-2.83 g/cm3The apparent porosity is 0.7-13.5%, and the product has excellent mechanical and chemical properties and can be used as a building material. Meanwhile, the utilization rate and the added value of the fly ash can be improved, the economic benefit of enterprises can be increased, and the environmental pollution can be reduced.
The prepared lightweight aggregate was subjected to strength test to obtain the results shown in Table 3 below
The huge stockpiling amount of the fly ash brings potential safety hazards to the environment, occupies valuable land resources, and under the actions of weathering and rain, toxic and harmful heavy metal ions in a fly ash yard can permeate into soil to pollute the soil and underground water, so that the life safety of human beings is indirectly harmed, and dust can be generated due to improper treatment to pollute the atmosphere, so that the utilization mode with large ash consumption is a favorable way for relieving the environmental pressure caused by the current fly ash stockpiling.
The lightweight aggregate can be used as a filler for concrete, and has excellent heat insulating property and durability enough to make people aware of the benefit of using the lightweight aggregate. The light aggregate concrete has the characteristics of light weight and high strength, so that the self weight of the concrete can be reduced when the light aggregate concrete is used for construction, and the effect of reducing the foundation load is particularly obvious for structures with large span, high rise and the like, so that the construction cost is reduced, the construction budget is reduced, and the economic benefit is increased.
The aggregate in the concrete is selected from sintered fly ash ceramsite, but the problem of high cost exists. Therefore, the invention is urgently needed to invent a technical invention which has low cost and does not consume a large amount of energy, and the invention is based on the invention.
The fly ash is mixed with a certain proportion of cement as a cementing material, the fly ash ceramsite is used as a light coarse aggregate, and other components are added to prepare the light high-strength concrete, so that a new idea is provided for the development of the light aggregate concrete, feasibility is provided for the utilization of a large amount of fly ash as a resource, and the fly ash is a perfect scheme regardless of the development and utilization of novel building materials or the solution of the problem of the fly ash to the environment.
Claims (10)
1. A preparation method of a large-volume fly ash unburned lightweight aggregate is characterized by comprising the following steps: the fly ash and the cement are uniformly mixed according to a proportion, then the mixture is put into a pelletizer, water glass is added for mixing and pelleting to form green pellets, and after the green pellets are dried, the green pellets are watered and cured at room temperature to form the lightweight aggregate microspheres.
2. The method for preparing the large-volume fly ash unfired lightweight aggregate according to claim 1, which is characterized in that: the proportion of the fly ash and the cement is that the fly ash accounts for 30-70% of the mixture of the fly ash and the cement in an ampere mass percentage.
3. The method for preparing the large-volume fly ash unfired lightweight aggregate according to claim 2, which is characterized in that: the proportion of the fly ash and the cement is 56.5 to 56.6 percent of the fly ash in the mixture of the fly ash and the cement in an ampere mass percentage.
4. The method for preparing the large-volume fly ash unfired lightweight aggregate according to claim 1, which is characterized in that: according to the mass percentage, the mass of the water glass is 10-60% of the mass of the mixture of the fly ash and the cement.
5. The method for preparing the large-doped fly ash unfired lightweight aggregate according to claim 4, which is characterized in that: according to the mass percentage, the mass of the water glass is 15.6-37.0% of the mass of the mixture of the fly ash and the cement.
6. The method for preparing the large-volume fly ash unfired lightweight aggregate according to claim 1, which is characterized in that: according to the mass percentage, the mass of the water is 10-60 percent of the total mass of the raw materials.
7. The method for preparing the large-doped fly ash unfired lightweight aggregate according to claim 6, which is characterized in that: according to the mass percentage, the mass of the water is 17.8-20.6% of the total mass of the raw materials.
8. The method for preparing the large-volume fly ash unfired lightweight aggregate according to claim 1, which is characterized in that: the particle size of the fly ash is less than 5mm, and the water content is less than 1% by mass percent.
9. The method for preparing the large-volume fly ash unfired lightweight aggregate according to claim 1, which is characterized in that: the green pellet drying temperature was 60 ℃.
10. The method for preparing the large-volume fly ash unfired lightweight aggregate according to claim 1, which is characterized in that: the particle size of the green pellets is 5mm-15 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110549128.3A CN113060983A (en) | 2021-05-20 | 2021-05-20 | Preparation method of large-volume fly ash unfired lightweight aggregate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110549128.3A CN113060983A (en) | 2021-05-20 | 2021-05-20 | Preparation method of large-volume fly ash unfired lightweight aggregate |
Publications (1)
| Publication Number | Publication Date |
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| CN113060983A true CN113060983A (en) | 2021-07-02 |
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|---|---|---|---|
| CN202110549128.3A Pending CN113060983A (en) | 2021-05-20 | 2021-05-20 | Preparation method of large-volume fly ash unfired lightweight aggregate |
Country Status (1)
| Country | Link |
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| CN (1) | CN113060983A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114409437A (en) * | 2022-02-20 | 2022-04-29 | 太原钢铁(集团)有限公司 | Method for preparing water permeable brick by using baking-free aggregate |
| CN115677248A (en) * | 2022-10-26 | 2023-02-03 | 中国建筑材料科学研究总院有限公司 | Carbon-fixing lightweight aggregate and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86106928A (en) * | 1986-10-09 | 1988-01-13 | 安徽省建筑科学研究所 | Non-calcined fine coal powder aggregate and preparation method thereof |
| US20120167804A1 (en) * | 2010-12-30 | 2012-07-05 | United States Gypsum Company | Method for In-Situ Manufacture of a Lightweight Fly Ash Based Aggregate |
| CN104788050A (en) * | 2015-01-27 | 2015-07-22 | 浙江大学 | Ceramsite lightweight aggregate structural concrete and preparation method thereof |
| CN106986568A (en) * | 2017-02-28 | 2017-07-28 | 中南大学 | A kind of unburned lightweight aggregate, lightweight concrete and its preparation |
| CN107555824A (en) * | 2017-09-26 | 2018-01-09 | 沈阳航空航天大学 | A kind of lightweight aggregate and preparation method thereof |
| US20180257989A1 (en) * | 2015-08-31 | 2018-09-13 | Washington State University | Fly ash cementitious compositions |
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2021
- 2021-05-20 CN CN202110549128.3A patent/CN113060983A/en active Pending
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114409437A (en) * | 2022-02-20 | 2022-04-29 | 太原钢铁(集团)有限公司 | Method for preparing water permeable brick by using baking-free aggregate |
| CN115677248A (en) * | 2022-10-26 | 2023-02-03 | 中国建筑材料科学研究总院有限公司 | Carbon-fixing lightweight aggregate and preparation method thereof |
| CN115677248B (en) * | 2022-10-26 | 2024-01-30 | 中国建筑材料科学研究总院有限公司 | Carbon-fixing lightweight aggregate and preparation method thereof |
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Application publication date: 20210702 |