CN112125630A - High-content phosphogypsum-based stabilizing material and application thereof in road base - Google Patents
High-content phosphogypsum-based stabilizing material and application thereof in road base Download PDFInfo
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- CN112125630A CN112125630A CN202011018545.7A CN202011018545A CN112125630A CN 112125630 A CN112125630 A CN 112125630A CN 202011018545 A CN202011018545 A CN 202011018545A CN 112125630 A CN112125630 A CN 112125630A
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- phosphogypsum
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- 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
- C04B28/143—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 phosphogypsum
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
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- 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
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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- 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
Abstract
The invention provides a high-content phosphogypsum-based stable material, which comprises the following raw materials in percentage by dry weight: ardealite, slag, cement and modifier. The modifier consists of calcium chloride, petroleum coke desulfurized ash, bentonite, talcum powder and casein. The preparation process of the high-doped phosphogypsum-based stable material is simple and feasible, energy-saving and environment-friendly, and easy to popularize; the large-dosage phosphogypsum-based stable material has better performance and low toxicity; the utilization rate of the phosphogypsum is high.
Description
Technical Field
The invention relates to a preparation method of a high-content phosphogypsum-based stable material and application of the high-content phosphogypsum-based stable material in a road base layer, and belongs to the field of road materials and preparation.
Background
The phosphogypsum is a large amount of industrial solid waste discharged in the process of extracting phosphoric acid by decomposing phosphate rock with sulfuric acid, about 5 tons of phosphogypsum is generated by preparing 1 ton of phosphoric acid, the main components of the phosphogypsum comprise calcium sulfate, phosphorus compounds, soluble fluorine, organic matters and the like, about 2.8 million tons of phosphogypsum are generated every year all over the world, the yield of the phosphogypsum in 2018 in China is 7800 ten thousand, but the comprehensive utilization rate is 39.7 percent, the technology for environment-friendly and efficient large-amount utilization of the phosphogypsum is lacked, the phosphogypsum is mainly treated in a stockpiling mode at present, not only occupies a large amount of land, but also causes the soluble phosphorus, the fluorine and other harmful substances to be soaked in soil, water bodies and vegetation after long-term stockpiling.
According to the structural form of municipal roads and highways, a road base structure of 50-120 cm is arranged between a road surface and a roadbed, so that a large amount of building materials can be consumed, related scholars also develop research and application of phosphogypsum for a road base, but broken stones, stone chips, mineral powder, cement and phosphogypsum are intensively adopted to be mixed, or wet grinding pretreatment is required to be carried out on the phosphogypsum, or organic rubber powder is added to physically wrap and bond the phosphogypsum. The research and application of road base layers of fine particle systems adopting undisturbed phosphogypsum and sub-nano powder such as cement, mineral powder and the like are almost not available. Under the current national strict resource and environment control policy of quarrying, mountain forest and the like, the more tense the aggregate resource is originally, the higher the price is, and great pressure is brought to engineering construction. The phosphogypsum is utilized to the maximum extent, aggregate resources such as broken stones and stone chips are reduced, the technical requirements of a road base can be met, and the pressure can be relieved to a great extent.
Disclosure of Invention
The invention aims to fully utilize the characteristics of particle composition and potential activity of the phosphogypsum, carry out activation modification by adopting slag, cement, a modifier and the like, passivate the activity of toxic substances in the phosphogypsum, reduce the leaching rate of the toxic substances and promote the formation of a gelling system structure through a core component in the modifier, and the main raw material is solid waste, so the cost is low, the performance is good, the consumption of the phosphogypsum is large, the new variety of road base material can be expanded, and the tension condition of the road base material in the area lacking of sandstone materials but rich in phosphogypsum can be relieved.
The present invention thus achieves the above objects:
a high-content phosphogypsum-based stable material comprises the following raw materials in percentage by dry weight: 64-74% of undisturbed phosphogypsum, 13-20% of slag, 7-13% of cement and 4-6% of modifier, and water accounts for 10-15% of the total dry solids.
The phosphogypsum is the undisturbed phosphogypsum accumulated in a tailing pond, the content of free phosphorus 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 particle size with the sieving passing rate of 50 percent is less than 50 um.
The specific surface area of the slag is more than or equal to 700 m2The grain diameter is less than 15 um, wherein the screening passing rate is 50%. The specific surface area of the cement is more than or equal to 330m2The grain diameter is less than 35um, wherein the screening passing rate is 50%. The modifier is prepared by mixing 25-35% of calcium chloride, 18-25% of petroleum coke desulfurized ash, 15-25% of bentonite, 18-27% of talcum powder and 5-15% of casein by mass percent through ultrasonic emulsification, drying and grinding at the temperature of 50-60 ℃.
The modifier is prepared by mixing 30% of calcium chloride, 22% of petroleum coke desulfurized ash, 18% of bentonite, 21% of talcum powder and 9% of casein by mass percent through ultrasonic emulsification, drying and grinding at the temperature of 60 ℃.
The screening passing rates of the phosphogypsum, the cement and the slag are different from 50%, the grain sizes of main grains are in gradient distribution, part of slightly larger grains can be crushed under the action of a smooth wheel or a vibration press to form continuous gradation with different grain sizes, the grains are mutually filled and gradually compacted, the contact probability among the grains is higher and higher, the contact specific surface area is enlarged, casein and the like in a modifier and the like accelerate the approaching speed among the grains, and the reaction of gelling active substances in the components is accelerated under the condition of proper moisture; because the undisturbed phosphogypsum contains a small amount of harmful substances such as acid, phosphorus and the like, the phosphogypsum is adsorbed and fixed by calcium chloride, bentonite, talcum powder and the like in a modifier in repeated rolling and static pressure; under the grinding action that smooth wheel or vibration press produced, the rubbing action aggravation between the granule, can be with active material surface coating graze and then expose the active material that gelatinizes, the granule surface is more and more crude, and the temperature rise that the rubbing action produced has in addition promoted the active reaction and has gone on. The superposition of the functions and the reaction gelation of the gelation active substance improve the compactness and the strength of the mixture and reduce the leaching of harmful substances, thereby forming a road base stabilizing material with good performance.
The high-doping-amount phosphogypsum-based stabilizing material is spread to 35-45 cm, statically compacted for 1-2 times by a 10-12 t double-steel-wheel road roller, then statically compacted for 1-2 times by a 26t single-steel-wheel vibratory road roller, then weakly vibrated for 1-2 times by a 20-22 t single-steel-wheel vibratory road roller, finally re-compacted for 2-4 times by the 26t road roller, and then covered and sealed by a film and geotextile for self-maintenance for not less than 21 days, so that the high-doping-amount phosphogypsum-based stabilizing material road base layer can be formed.
The invention has the advantages that: (1) the preparation process of the high-doped phosphogypsum-based stable material is simple and feasible, energy-saving and environment-friendly, and easy to popularize; (2) the large-dosage phosphogypsum-based stable material has better performance and low toxicity; (3) the utilization rate of the phosphogypsum is high.
Detailed Description
Example 1
The adopted undisturbed phosphogypsum has the free phosphorus content of 5.2mg/L and the free fluoride ion content of 329mg/L, the particle size with the sieving passing rate of 50 percent is 47.1um, and the particle size distribution with the sieving passing rate of 50 percent of slag and cement is 14.6 um and 33.5 um. Dry basis proportion: 64kg of undisturbed phosphogypsum, 20kg of slag, 10kg of cement, 6kg of modifier and 15.0kg of water content of the mixture. The modifier is prepared by mixing 1.8kg of calcium chloride, 1.32kg of petroleum coke desulfurization ash, 1.08kg of bentonite, 1.26kg of talcum powder and 0.54kg of casein through ultrasonic emulsification, drying and grinding at the temperature of 60 ℃. The high-doping-amount phosphogypsum-based stabilizing material is prepared according to the procedure that metered undisturbed phosphogypsum, slag powder and cement are added into a continuous stabilizing soil stirrer to be uniformly mixed for 45s, then a modifier is added to be mixed and stirred for 20s, then water is added to be mixed and stirred for 25 s.
The high-doped phosphogypsum-based stabilizing material is paved to 35-45 cm after being transported to an appointed construction site for 40-120 min by a closed muck truck, is statically compacted for 1-2 times by a 10-12 t double-steel-wheel road roller, is compacted for 1-2 times by a 26t single-steel-wheel vibratory road roller in a static pressure manner, is then weakly vibrated for 1-2 times, is weakly vibrated for 1-2 times by a 20-22 t single-steel-wheel vibratory road roller, is re-compacted for 2-4 times by a 26t road roller, and is covered by a film and geotextile for closed self-maintenance for not less than 21 days.
After 21 days, leachate was prepared according to the "solid waste leaching toxicity leaching method horizontal oscillation method" (HJ 557-2010). The content of total phosphorus in the leachate is detected according to an ammonium metapholybdate spectrophotometry method for determining total phosphorus in solid waste (HJ 712-. The minimum unconfined compressive strength is 4.12MPa, after 21 days, 150mm phi is drilled, 150mm is drilled, the minimum coring strength is 3.87MPa, the minimum compaction degree is 99.1 percent, and the requirement of a first-level highway heavy traffic channel base course in the highway asphalt pavement design specification (JTG D50-2017) is met, so that the high-doping-amount phosphogypsum-based stable material road base course can be formed.
Example 2
The adopted undisturbed phosphogypsum has the free phosphorus content of 5.2mg/L and the free fluoride ion content of 329mg/L, the particle size with the sieving passing rate of 50 percent is 47.1um, and the particle size distribution with the sieving passing rate of 50 percent of slag and cement is 14.6 um and 33.5 um. Dry basis proportion: 70kg of undisturbed phosphogypsum, 20kg of slag, 10kg of cement and 15.0kg of water content of the mixture. Adding the measured original-state phosphogypsum, slag powder and cement into a continuous stabilized soil stirrer, uniformly mixing for 45s, then adding water, mixing and stirring for 25s to obtain the phosphogypsum-based stabilizing material, namely the phosphogypsum-based stabilizing material.
The phosphogypsum-based stabilizing material is conveyed to a specified construction site by a closed muck truck for 40-120 min, then paved to 35-45 cm, statically compacted for 1-2 times by a 10-12 t double-steel-wheel road roller, then statically compacted for 1-2 times by a 26t single-steel-wheel vibratory road roller, weakly vibrated for 1-2 times by a 20-22 t single-steel-wheel vibratory road roller, and finally re-compacted for 2-4 times by the 26t road roller, and then covered by a film and geotextile for closed self-maintenance for not less than 21 days.
After 21 days, leachate was prepared according to the "solid waste leaching toxicity leaching method horizontal oscillation method" (HJ 557-2010). The content of total phosphorus in the leachate is detected according to an ammonium metapholybdate spectrophotometry method for determining total phosphorus in solid waste (HJ 712-. The minimum unconfined compressive strength is 3.23MPa, 150mm phi is drilled after 21 days, the minimum strength of coring is 3.11MPa, the minimum compactness is 90.5 percent, and the strength does not meet the requirement of a grade I highway heavy traffic channel base course in the highway asphalt pavement design Specification (JTG D50-2017).
Example 3
The content of free phosphorus in the adopted undisturbed phosphogypsum is 4.7mg/L, the content of free fluorine ions is 291mg/L, the particle size with the sieving passing rate of 50 percent is 44.5um, and the particle size distribution with the sieving passing rate of slag and cement of 50 percent is 13.9um and 31.4 um. Dry basis proportion: 69kg of undisturbed phosphogypsum, 13kg of slag, 13kg of cement, 5kg of modifier and 15.0kg of water content of the mixture. The modifier is prepared by mixing 1.5kg of calcium chloride, 1.1kg of petroleum coke desulfurized ash, 0.9kg of bentonite, 1.05kg of talcum powder and 0.45kg of casein through ultrasonic emulsification, drying and grinding at the temperature of 60 ℃. The high-doping-amount phosphogypsum-based stabilizing material is prepared according to the procedure that metered undisturbed phosphogypsum, slag powder and cement are added into a continuous stabilizing soil stirrer to be uniformly mixed for 40s, then a modifier is added to be mixed and stirred for 22s, then water is added to be mixed and stirred for 20 s.
The high-doped phosphogypsum-based stabilizing material is paved to 35-45 cm after being transported to an appointed construction site for 40-120 min by a closed muck truck, is statically compacted for 1-2 times by a 10-12 t double-steel-wheel road roller, is compacted for 1-2 times by a 26t single-steel-wheel vibratory road roller in a static pressure manner, is then weakly vibrated for 1-2 times, is weakly vibrated for 1-2 times by a 20-22 t single-steel-wheel vibratory road roller, is re-compacted for 2-4 times by a 26t road roller, and is covered by a film and geotextile for closed self-maintenance for not less than 21 days.
After 21 days, leachate was prepared according to the "solid waste leaching toxicity leaching method horizontal oscillation method" (HJ 557-2010). The content of total phosphorus in the leachate is detected according to an ammonium metapholybdate spectrophotometry method for determining total phosphorus in solid waste (HJ 712-. The minimum unconfined compressive strength is 3.97MPa, after 21 days, 150mm phi is drilled, the minimum strength is 3.76MPa, the minimum compaction degree is 98.8%, and the requirements of grade I highway heavy traffic channel base course in the highway asphalt pavement design Specification (JTG D50-2017) are met, so that the high-doping-amount phosphogypsum-based stable material road base course can be formed.
Example 4
The content of free phosphorus in the adopted undisturbed phosphogypsum is 4.7mg/L, the content of free fluorine ions is 291mg/L, the particle size with the sieving passing rate of 50 percent is 44.5um, and the particle size distribution with the sieving passing rate of slag and cement of 50 percent is 13.9um and 31.4 um. Dry basis proportion: 69kg of undisturbed phosphogypsum, 13kg of slag, 12kg of cement, 7kg of modifier and 15.0kg of water content of the mixture. The modifier is prepared by mixing 1.5kg of calcium chloride, 1.1kg of petroleum coke desulfurized ash and 1.05kg of talcum powder through ultrasonic emulsification, drying and grinding at the temperature of 60 ℃. Adding the measured original phosphogypsum, slag powder and cement into a continuous stabilized soil stirrer, uniformly mixing for 40s, adding the modifier, mixing and stirring for 22s, then adding water, mixing and stirring for 20s to obtain the phosphogypsum-based stabilizing material with large doping amount.
The phosphogypsum-based stabilizing material is conveyed to a specified construction site by a closed muck truck for 40-120 min, then paved to 35-45 cm, statically compacted for 1-2 times by a 10-12 t double-steel-wheel road roller, then statically compacted for 1-2 times by a 26t single-steel-wheel vibratory road roller, weakly vibrated for 1-2 times by a 20-22 t single-steel-wheel vibratory road roller, and finally re-compacted for 2-4 times by the 26t road roller, and then covered by a film and geotextile for closed self-maintenance for not less than 21 days.
After 21 days, leachate was prepared according to the "solid waste leaching toxicity leaching method horizontal oscillation method" (HJ 557-2010). The content of total phosphorus in the leachate is detected according to an ammonium metapholybdate spectrophotometry method for determining total phosphorus in solid waste (HJ 712-. The minimum unconfined compressive strength is 3.73MPa, 150mm phi is drilled after 21 days, the minimum strength of coring is 3.27MPa, the minimum compactness is 89.2%, and the compactness does not meet the requirement of a grade-I highway heavy traffic channel base course in the highway asphalt pavement design Specification (JTG D50-2017).
Example 5
The adopted undisturbed phosphogypsum has the free phosphorus content of 4.4mg/L and the free fluoride ion content of 287mg/L, the particle size with the sieving passing rate of 50 percent is 41.6um, and the particle size distribution with the sieving passing rate of 50 percent of slag and cement is 12.7um and 28.4 um. Dry basis proportion: 74kg of undisturbed phosphogypsum, 15kg of slag, 7kg of cement, 4kg of modifier and 15.0kg of water content of the mixture. The modifier is prepared by mixing 1.2kg of calcium chloride, 0.88kg of petroleum coke desulfurization ash, 0.72kg of bentonite, 0.84kg of talcum powder and 0.39kg of casein through ultrasonic emulsification, drying and grinding at the temperature of 60 ℃. The high-doping-amount phosphogypsum-based stabilizing material is prepared according to the procedure that metered undisturbed phosphogypsum, slag powder and cement are added into a continuous stabilizing soil stirrer to be uniformly mixed for 35s, then a modifier is added to be mixed and stirred for 25s, then water is added to be mixed and stirred for 15s, and then the high-doping-amount phosphogypsum-based stabilizing material is obtained.
The high-doped phosphogypsum-based stabilizing material is paved to 35-45 cm after being transported to an appointed construction site for 40-120 min by a closed muck truck, is statically compacted for 1-2 times by a 10-12 t double-steel-wheel road roller, is compacted for 1-2 times by a 26t single-steel-wheel vibratory road roller in a static pressure manner, is then weakly vibrated for 1-2 times, is weakly vibrated for 1-2 times by a 20-22 t single-steel-wheel vibratory road roller, is re-compacted for 2-4 times by a 26t road roller, and is covered by a film and geotextile for closed self-maintenance for not less than 21 days.
After 21 days, leachate was prepared according to the "solid waste leaching toxicity leaching method horizontal oscillation method" (HJ 557-2010). The content of total phosphorus in the leachate is detected according to an ammonium metapholybdate spectrophotometry method for determining total phosphorus in solid waste (HJ 712-. The lowest unconfined compressive strength is 3.88MPa, a core sample with the diameter of 150mm to 150mm is drilled after 21 days, the lowest strength of coring is 3.64MPa, the lowest compaction degree is 98.4 percent, and the requirement of a primary highway heavy traffic channel base course in the highway asphalt pavement design specification (JTG D50-2017) is met, so that the high-doping-amount phosphogypsum-based stable material road base course can be formed.
Claims (8)
1. The high-doped phosphogypsum-based stable material is characterized by comprising the following raw materials in percentage by dry weight: 64-74% of phosphogypsum, 13-20% of slag, 7-13% of cement and 4-6% of modifier.
2. The heavily doped phosphogypsum-based stabilizing material as set forth in 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 screening passing rate is that the particle size of 50 percent is less than 50 um.
3. The heavily doped phosphogypsum-based stabilizing material as set forth in claim 1, wherein: the specific surface area of the slag is more than or equal to 700 m2The grain diameter is less than 15 um, wherein the screening passing rate is 50%.
4. The heavily doped phosphogypsum-based stabilizing material as set forth in claim 1, wherein: the specific surface area of the cement is more than or equal to 330m2The grain diameter is less than 35um, wherein the screening passing rate is 50%.
5. The heavily doped phosphogypsum-based stabilizing material as set forth in claim 1, wherein: the modifier is prepared by mixing 25-35% of calcium chloride, 18-25% of petroleum coke desulfurized ash, 15-25% of bentonite, 18-27% of talcum powder and 5-15% of casein by mass percent through ultrasonic emulsification, drying and grinding.
6. The heavily doped phosphogypsum-based stabilizing material as set forth in claim 5, wherein: the modifier is prepared by mixing 30% of calcium chloride, 22% of petroleum coke desulfurized ash, 18% of bentonite, 21% of talcum powder and 9% of casein by mass percent through ultrasonic emulsification, drying and grinding.
7. The method for preparing the high content phosphogypsum-based stabilizing material as claimed in any one of claims 1 to 6, which is characterized in that: adding the measured phosphogypsum, slag powder and cement into a continuous stabilized soil stirrer, uniformly mixing for 35-45 s, adding a modifier, mixing and stirring for 20-25 s, then adding water, wherein the water accounts for 10-15% of the total amount of the dry raw materials, and mixing and stirring for 15-25 s to obtain the high-doping-amount phosphogypsum-based stabilizing material.
8. Use of the heavily doped phosphogypsum-based stabilising material according to any of claims 1-6 as a road base material, characterised in that: the high-doping-amount phosphogypsum-based stabilizing material is paved to 35-45 cm, and is statically compacted for 1-2 times by a 10-12 t double-steel-wheel road roller, then a 26t single-steel-wheel vibratory road roller is statically compacted for 1-2 times and then weakly vibrated for 1-2 times, then a 20-22 t single-steel-wheel vibratory road roller is used for weakly vibrating for 1-2 times, finally the 26t road roller is pressed for 2-4 times again, and then a film and geotextile are used for covering, sealing and self-curing for not less than 21 days, so that the high-doping-amount phosphogypsum-based stabilizing material road base layer can be formed.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114751708A (en) * | 2022-04-06 | 2022-07-15 | 湖北昌耀新材料工程技术研究有限责任公司 | Phosphogypsum embankment filler, application thereof and preparation method of highway pavement base course |
| CN116571534A (en) * | 2023-07-12 | 2023-08-11 | 北京建工环境修复股份有限公司 | Phosphogypsum harmless medicament and engineering application method |
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