CN112094066B - Phosphogypsum-based aggregate for asphalt mixture and preparation method thereof - Google Patents
Phosphogypsum-based aggregate for asphalt mixture and preparation method thereof Download PDFInfo
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- CN112094066B CN112094066B CN202011018543.8A CN202011018543A CN112094066B CN 112094066 B CN112094066 B CN 112094066B CN 202011018543 A CN202011018543 A CN 202011018543A CN 112094066 B CN112094066 B CN 112094066B
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- phosphogypsum
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- curing agent
- modified silicon
- asphalt mixture
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- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 title claims abstract description 62
- 239000010426 asphalt Substances 0.000 title claims abstract description 41
- 239000000203 mixture Substances 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 48
- KMWBBMXGHHLDKL-UHFFFAOYSA-N [AlH3].[Si] Chemical class [AlH3].[Si] KMWBBMXGHHLDKL-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 36
- 238000002156 mixing Methods 0.000 claims abstract description 32
- 238000000227 grinding Methods 0.000 claims abstract description 17
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 3
- 239000002245 particle Substances 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 8
- 239000011574 phosphorus Substances 0.000 claims description 8
- 229910052698 phosphorus Inorganic materials 0.000 claims description 8
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 6
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 claims description 6
- 229910021540 colemanite Inorganic materials 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 claims description 5
- -1 fluoride ions Chemical class 0.000 claims description 4
- 238000007873 sieving Methods 0.000 claims description 4
- 239000000292 calcium oxide Substances 0.000 claims description 3
- 235000012255 calcium oxide Nutrition 0.000 claims description 3
- 239000004115 Sodium Silicate Substances 0.000 claims description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims 2
- 230000003647 oxidation Effects 0.000 claims 1
- 238000007254 oxidation reaction Methods 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 10
- 239000000463 material Substances 0.000 abstract description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 2
- 238000012216 screening Methods 0.000 description 10
- 238000010521 absorption reaction Methods 0.000 description 5
- 238000009826 distribution Methods 0.000 description 5
- 239000007921 spray Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000003334 potential effect Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/021—Agglomerated materials, e.g. artificial aggregates agglomerated by a mineral binder, e.g. cement
-
- 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
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Civil Engineering (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Road Paving Structures (AREA)
Abstract
The invention provides a preparation method of phosphogypsum-based aggregate for an asphalt mixture, and the mixed material comprises the following raw materials in dry weight percentage: ardealite, modified silicon-aluminum active powder and a curing agent. The modified silicon-aluminum active powder is prepared by mixing metakaolin, silica fume and silica-alumina powder and then grinding the mixture by an ultramicro airflow mill. The ardealite-based aggregate for the asphalt mixture has high automation degree, is energy-saving and environment-friendly, is easy to popularize, has better performance, meets the technical requirements of aggregate quality for the asphalt mixture in technical Specifications for road asphalt pavement construction (JTG F40-2004), and can be widely applied to aggregates of the mixtures for various grades of roads and municipal asphalt pavements.
Description
Technical Field
The invention relates to a phosphogypsum-based aggregate for an asphalt mixture and a preparation method thereof, belonging to the field of engineering materials and preparation.
Background
Phosphogypsum is industrial waste residue produced in the process of producing phosphoric acid by a wet method in a fertilizer plant. The main component of the phosphogypsum is CaSO4·2H2O, but also contains soluble phosphorus, soluble fluorine, residual free acid and the like, and the stockpiling causes environmental pollution to water and soil. At present, the historical phosphogypsum stockpiling quantity in China exceeds 5 hundred million tons, the annual new production is about 7000 tons, and the comprehensive utilization rate is less than 40 percent. On the other hand, the requirements on the environmental protection of the crushed stone mine and the mine resource control are limited in China, the crushed stone resource is more and more tense, the price is more and more high, and various basic constructions, particularly municipal administration and road construction, are greatly restrictedThe development of the asphalt pavement is that the main pavement form of municipal roads and highways in China has large demand on broken stones and high quality requirement, and brings great trouble to construction. The phosphogypsum-based artificial aggregate for the asphalt pavement is processed by the phosphogypsum through reducing toxicity, improving the wear resistance and the like of the phosphogypsum, is a novel method for comprehensively utilizing the phosphogypsum, and the prepared aggregate can be widely applied to aggregates of various grades of mixture for highways and municipal asphalt pavements.
Disclosure of Invention
The invention aims to fully utilize the particle size and potential activity characteristics of phosphogypsum particles, activate and modify the phosphogypsum by adopting metakaolin, silica fume, silica-alumina powder, a curing agent and the like, fix pollutants in the phosphogypsum and promote the formation of a gelling system structure. The aggregate which can be widely applied to the mixture for various grades of highways and municipal asphalt pavements is prepared by the processes of modification, aggregate molding, maintenance and the like.
The present invention thus achieves the above objects:
the phosphogypsum-based aggregate for the asphalt mixture comprises the following raw materials in percentage: 70-85% of phosphogypsum, 10-16% of modified silicon-aluminum active powder, 4-8% of curing agent and 0.15-0.30% of water-solid ratio.
The content of free phosphorus in the phosphogypsum is less than or equal to 6.0mg/L, the content of free fluoride ions is less than or equal to 350mg/L, and the sieving passing rate is that the particle size of 50 percent is less than 50 mu m; the specific surface area of the modified silicon-aluminum active powder is more than or equal to 600m2Kg, the particle size with the sieving passing rate of 50 percent is less than 35 mu m; the specific surface area of the curing agent is more than or equal to 700 m2The particle size is < 15 μm at a sieve passage of 50%/kg.
The modified silicon-aluminum active powder is prepared by grinding and mixing 35-45% of metakaolin, 22-35% of silica fume and 28-40% of silica-aluminum powder. Preferably, the modified silicon-aluminum active powder material is prepared by grinding and mixing 40% of metakaolin produced by Shanghai Hao Fuji chemical industry Co., Ltd, 27% of silica fume produced by Shandong six-Fu-Si Material Co., Ltd, 33% of silica-aluminum powder produced by Guizhou Haitian ferroalloy grinding material Co., Ltd and the like.
The curing agent is prepared by mixing one or more of sodium silicate powder, quicklime powder, calcium nitrate and colemanite, and grinding for 15min by a planetary mill.
The aggregate preparation system is an efficient aggregate molding preparation system and comprises a phosphogypsum homogenizing bin, a mixing homogenizing bin, an aggregate molding machine, a central control room and a steam curing kiln. The modified silicon-aluminum active powder bin and the curing agent bin are connected with a mixing homogenizing bin through a conveying device, the phosphogypsum homogenizing bin, the mixing homogenizing bin and the aggregate forming machine are connected with a central control room, a water spraying device is arranged at the top of the aggregate forming machine and connected with a water pump, the aggregate forming machine is connected with a maintenance room through a buffer conveyor belt, and a distributor is arranged at the initial 50cm position of the buffer conveyor belt.
Inputting an optimal formula into a central control system, allowing undisturbed phosphogypsum to enter an aggregate forming machine with the rotating speed of 20rpm and mixing for 1-3 min, conveying modified silicon-aluminum active powder and a curing agent in a material mixing homogenization bin to the aggregate forming machine through a conveying device, contacting the phosphogypsum under an atomization spray head to quickly form aggregate, wherein the aggregate forming time is 6-12min, conveying the prepared wet aggregate to a curing room through a conveying belt with a buffer device, and performing steam curing for 28 days to obtain phosphogypsum-based aggregate for the asphalt mixture, wherein the phosphogypsum-based aggregate meets the technical requirements of aggregate quality for the asphalt mixture in road asphalt pavement construction technical Specifications (JTG F40-2004).
The invention has the advantages that: (1) the preparation process has high automation degree, energy conservation, environmental protection and easy popularization; (2) the phosphogypsum-based aggregate for the asphalt mixture has better performance; (3) high phosphogypsum consumption and good economic and environmental protection benefits.
Detailed Description
Example 1
The content of free phosphorus in the adopted original-state phosphogypsum is 4.9mg/L, the content of free fluoride ions is 312mg/L, the particle size with the screening passing rate of 50 percent is 42.8 mu m, and the particle size distribution with the screening passing rates of 50 percent of the modified silicon-aluminum active powder and the curing agent is 21.3 mu m and 11.2 mu m respectively. Dry basis proportion: 75kg of undisturbed phosphogypsum, 16kg of modified silicon-aluminum active powder, 9kg of curing agent and 30.0kg of water. The modified silicon-aluminum active powder is prepared by mixing 5.6kg of metakaolin, 3.52kg of silica fume and 6.88kg of silicon-aluminum powder and then grinding the mixture by an ultramicro airflow mill, wherein the specific surface of the modified silicon-aluminum active powder isProduct of 640m2In terms of/kg. The curing agent is formed by planetary grinding of colemanite, and the specific surface area of the curing agent is 800m2/kg。
The phosphogypsum-based aggregate for the asphalt mixture is produced by adopting an aggregate high-efficiency forming preparation system: inputting an optimal formula into a central control system, enabling undisturbed phosphogypsum to enter an aggregate forming machine with the rotating speed of 20rpm for mixing for 1min, conveying modified silicon-aluminum active powder and a curing agent in a material mixing homogenizing bin to the aggregate forming machine through a conveying device, enabling the modified silicon-aluminum active powder and the curing agent to contact with the phosphogypsum under an atomizing spray head for fast mixing to form aggregate, enabling the aggregate forming time to be 6min, conveying prepared wet aggregate to a curing room through a conveying belt with a buffer device for steam curing for 28 days to obtain phosphogypsum-based aggregate for the asphalt mixture, and testing shows that the crushing value is 21.1%, the loss of los angeles due to abrasion is 22.5%, the apparent relative density is 2.44, the water absorption is 1.67%, the needle-shaped particle content is 1.0%, and the aggregate quality technical requirements for the asphalt mixture in road asphalt pavement construction technical specification (JTG 40-2004) are met.
Example 2
The content of free phosphorus in the adopted original-state phosphogypsum is 5.5mg/L, the free fluoride ion is 327mg/L, the particle size with the screening passing rate of 50 percent is 44.2 mu m, and the particle size distribution with the screening passing rates of 50 percent of the modified silicon-aluminum active powder and the curing agent is 24.3 mu m and 13.1 mu m respectively. Dry basis proportion: 85kg of undisturbed phosphogypsum, 10kg of modified silicon-aluminum active powder, 5kg of curing agent and 15.0kg of water. The modified silicon-aluminum active powder is prepared by mixing 4.5kg of metakaolin, 2.7kg of silica fume and 2.8kg of silicon-aluminum powder and then grinding the mixture by using an ultramicro airflow mill, wherein the specific surface area of the modified silicon-aluminum active powder is 750m2In terms of/kg. The curing agent is prepared from quicklime powder and colemanite in a mass ratio of 1: 5, the curing agent is prepared by mixing and then grinding the mixture in a planetary way, and the specific surface area of the curing agent is 830 m2/kg。
The phosphogypsum-based aggregate for the asphalt mixture is produced by adopting an aggregate high-efficiency forming preparation system: inputting an optimal formula into a central control system, enabling undisturbed phosphogypsum to enter an aggregate forming machine with the rotating speed of 20rpm for mixing for 3min, conveying modified silicon-aluminum active powder and a curing agent in a material mixing homogenizing bin to the aggregate forming machine through a conveying device, enabling the modified silicon-aluminum active powder and the curing agent to contact with the phosphogypsum under an atomizing spray head for fast mixing to form aggregate, wherein the aggregate forming time is 12min, conveying prepared wet aggregate to a curing room through a conveying belt with a buffer device for steam curing for 28 days to obtain phosphogypsum-based aggregate for the asphalt mixture, and tests show that the crushing value is 22.4%, the loss of los angeles is 24.5%, the apparent relative density is 2.16, the water absorption is 1.87%, and the content of needle-shaped particles is 1.1%, so that the aggregate quality technical requirements for the asphalt mixture in road asphalt pavement construction technical specification (JTG 40-2004) are met.
Example 3
The content of free phosphorus in the adopted undisturbed phosphogypsum is 5.1mg/L, the content of free fluoride ions is 302mg/L, the particle size with the screening passing rate of 50 percent is 37.2 mu m, and the particle size distribution with the screening passing rates of 50 percent of the modified silicon-aluminum active powder and the curing agent is 27.7 mu m and 14.2 mu m respectively. Dry basis proportion: 80kg of undisturbed phosphogypsum, 16kg of modified silicon-aluminum active powder, 4kg of curing agent and 15.0kg of water. The modified silicon-aluminum active powder is prepared by mixing 5.76kg of metakaolin, 5.6kg of silica fume and 4.64kg of silicon-aluminum powder and then grinding the mixture by using an ultramicro airflow mill, wherein the specific surface area of the modified silicon-aluminum active powder is 720m2In terms of/kg. The curing agent is prepared from calcium nitrate and colemanite in a mass ratio of 1: 3 is formed by planetary grinding after mixing, and the specific surface area of the curing agent is 850 m2/kg。
The phosphogypsum-based aggregate for the asphalt mixture is produced by adopting an aggregate high-efficiency forming preparation system: inputting an optimal formula into a central control system, enabling original phosphogypsum to enter an aggregate forming machine with the rotating speed of 20rpm for mixing for 1.8min, conveying modified silicon-aluminum active powder and a curing agent in a material mixing homogenizing bin to the aggregate forming machine through a conveying device, enabling the modified silicon-aluminum active powder and the curing agent to contact with the phosphogypsum under an atomizing nozzle to be quickly mixed into aggregate, enabling the aggregate forming time to be 8min, conveying prepared wet aggregate to a curing room through a conveying belt with a buffer device for steam curing for 28 days, and obtaining the phosphogypsum-based aggregate for the asphalt mixture, wherein tests show that the crushing value is 22.7%, the loss of los angeles due to abrasion is 23.8%, the apparent relative density is 2.21, the water absorption is 1.71%, and the content of needle-shaped particles is 1.0%, and the aggregate quality technical requirements for the asphalt mixture in road asphalt pavement construction technical specification (JTG F40-2004) are met.
Example 4
The adopted undisturbed phosphogypsum has the free phosphorus content of 5.1mg/L and the free fluoride ion content of 302mg/L, the particle size with the screening passing rate of 50 percent is 37.2 mu m, and the particle size distribution with the screening passing rate of 50 percent of the modified silicon-aluminum active powder is 27.7 mu m. Dry basis proportion: 84kg of undisturbed phosphogypsum, 16kg of modified silicon-aluminum active powder and 15.0kg of water. The modified silicon-aluminum active powder is prepared by mixing and grinding 5.76kg of metakaolin, 5.6kg of silica fume and 4.64kg of silicon-aluminum powder, and the specific surface area of the modified silicon-aluminum active powder is 550m2/kg。
The phosphogypsum-based aggregate for the asphalt mixture is produced by adopting an aggregate high-efficiency forming preparation system: inputting an optimal formula into a central control system, enabling undisturbed phosphogypsum to enter an aggregate forming machine with the rotating speed of 20rpm for mixing for 1.8min, conveying modified silicon-aluminum active powder in a mixing homogenizing bin to the aggregate forming machine through a conveying device, enabling the modified silicon-aluminum active powder to contact with the phosphogypsum under an atomizing spray head for fast mixing to form aggregate, enabling the aggregate forming time to be 8min, conveying prepared wet aggregate to a curing room through a conveying belt with a buffer device for steam curing for 28 days to obtain phosphogypsum-based aggregate for the asphalt mixture, and testing shows that the crushing value is 27.3%, the loss of los angeles, the apparent relative density is 2.73, the water absorption rate is 2.5%, the content of needle-shaped particles is 14%, and the quality technical requirements for the asphalt mixture in the technical specification for road asphalt pavement construction (JTG 40-2004) are not met.
Example 5
The content of free phosphorus in the adopted undisturbed phosphogypsum is 5.5mg/L, the free fluoride ion is 327mg/L, the particle size with the screening passing rate of 50 percent is 44.2 mu m, and the particle size distribution with the screening passing rate of 50 percent of the curing agent is 14.2 mu m. Dry basis proportion: 96kg of undisturbed phosphogypsum, 4kg of curing agent and 15.0kg of water. The curing agent is formed by planet grinding of colemanite, and the specific surface area of the curing agent is 630 m2/kg。
The phosphogypsum-based aggregate for the asphalt mixture is produced by adopting an aggregate high-efficiency forming preparation system: inputting an optimal formula into a central control system, enabling original phosphogypsum to enter an aggregate forming machine with the rotating speed of 20rpm for mixing for 1.8min, conveying a curing agent in a mixing homogenizing bin to the aggregate forming machine through a conveying device, enabling the curing agent to contact with the phosphogypsum under an atomizing spray head for fast mixing to form aggregate, enabling the aggregate forming time to be 8min, conveying prepared wet aggregate to a curing room through a conveying belt with a buffer device for steam curing for 28 days, and obtaining phosphogypsum-based aggregate for the asphalt mixture, wherein tests show that the crushing value is 28.4%, the loss of los angeles is 33.4%, the apparent relative density is 2.88, the water absorption rate is 3.15%, the content of needle-shaped particles is 14.4%, and the aggregate quality technical requirements for the asphalt mixture in road asphalt pavement construction technical specification (JTG F40-2004) are not met.
Claims (3)
1. The phosphogypsum-based aggregate for the asphalt mixture is characterized by comprising the following raw materials in percentage: 70-85% of phosphogypsum, 10-16% of modified silicon-aluminum active powder, 4-8% of curing agent and 0.15-0.30 of water-solid ratio, wherein the modified silicon-aluminum active powder is prepared by mixing 35-45% of metakaolin, 22-35% of silica fume and 28-40% of silicon-aluminum powder by mass fraction and then grinding the mixture through ultramicro airflow grinding, and the curing agent is prepared by mixing one or more of sodium silicate powder, quicklime powder, calcium nitrate and colemanite and grinding the mixture through a planet grinding method.
2. The phosphogypsum-based aggregate for the asphalt mixture according to claim 1, wherein the content of free phosphorus in the phosphogypsum is less than or equal to 6.0mg/L, the content of free fluoride ions is less than or equal to 350mg/L, and the sieving pass rate is that the particle size of 50 percent is less than 50 μm; the specific surface area of the modified silicon-aluminum active powder is more than or equal to 600m2Kg, the particle size with the sieving passing rate of 50 percent is less than 35 mu m; the specific surface area of the curing agent is more than or equal to 700 m2A particle size of < 15 μm per kg, with a sieve pass rate of 50%.
3. The preparation method of the phosphogypsum-based aggregate for the asphalt mixture according to claim 1 or 2 is characterized in that phosphogypsum is added into an aggregate forming machine and mixed for 1-3 min at the rotating speed of 20-40 rpm;
uniformly mixing the modified silicon-aluminum active powder and the curing agent, conveying the mixture to an aggregate forming machine, spraying atomized water in the process of continuous stirring, stirring for 6-12min to obtain wet aggregate, and performing steam oxidation on the wet aggregate for 28-30 days to obtain the phosphogypsum-based aggregate for the asphalt mixture.
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