CN115180854A - Preparation and application method of carbon-fixing type commercial concrete waste slurry - Google Patents
Preparation and application method of carbon-fixing type commercial concrete waste slurry Download PDFInfo
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- CN115180854A CN115180854A CN202210599851.7A CN202210599851A CN115180854A CN 115180854 A CN115180854 A CN 115180854A CN 202210599851 A CN202210599851 A CN 202210599851A CN 115180854 A CN115180854 A CN 115180854A
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
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- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Crushing And Grinding (AREA)
Abstract
The invention provides a preparation method and an application method of carbon-fixing type commercial concrete waste slurry, which is characterized in that the waste slurry A of a commercial concrete mixing plant is collected in a sedimentation tank and pumped into a concentration tank by a slurry pump; adding 0.1% -1% of chemical precipitator into the concentration tank to precipitate the commercial concrete waste slurry in the concentration tank for 1-2h to obtain concentrated waste slurry B; mixing 150-200 parts of concentrated waste slurry B with 300-400 parts of zirconia balls, grinding in a vertical stirred ball mill for 10-30 min, and introducing CO during grinding 2 And obtaining the carbon-fixing type commercial concrete waste slurry with the median particle size of 3-9 mu m after grinding. The carbon-fixing type commercial concrete waste slurry is doped into the premixed concrete to replace 5 to 15 percent of the cement consumption. The invention realizes the solid waste resource utilization of the commercial concrete waste slurry and the high added value utilization of carbon dioxide, and has the advantages of simple preparation process, low cost and high solid carbon rate.
Description
Technical Field
The invention belongs to the technical field of carbon sequestration, and particularly relates to a preparation method and an application method of carbon sequestration type commercial concrete waste slurry.
Background
Along with the rapid development of the infrastructure of China, the usage amount of commercial concrete as a building raw material is increased, a concrete mixing station can discharge a large amount of waste slurry when cleaning a mixer, a field, a concrete tank truck and the like in the production of concrete, and in addition, a large amount of waste plastic concrete generated by the commercial concrete mixing station due to various reasons is subjected to sand-stone separation treatment to generate a large amount of waste slurry. Since 2018, the annual concrete yield of China exceeds 23.32 hundred million m 3 And each production time is 1m 3 The concrete generates 40kg of waste slurry on average, which means that commercial concrete mixing plants in China generate about 0.9 million tons of waste slurry every year. At present, the commercial concrete mixing station treats the waste commercial concrete slurry by partially replacing cement and adding the waste commercial concrete slurry into low-medium-grade ready-mixed concrete. A large number of expert scholars also mix commercial concrete waste slurry into the premixed concrete for research, and the conclusion shows that: the mechanical property, the frost resistance and the corrosion resistance of the concrete are not obviously influenced by the mixing of the commercial mixed waste slurry, and the carbonization resistance is improved. However, the mechanical interlocking reaction of the commercial mixed waste slurry in the precipitation process and the high alkalinity property (pH is more than 12) bring non-negligible influence on the workability of the ready-mixed concrete and the dosage of the admixture.
Therefore, the invention combines the liquid phase grinding process and the carbon mineralization technology, and provides a preparation method and an application method of the carbon-fixing type waste slurry for the commercial concrete. The integrated process flow of solid waste resource utilization of the commercial concrete waste slurry and high added value utilization of carbon dioxide is realized, the huge carbon dioxide carbon emission pressure in China can be relieved, and the low carbonization of building materials is promoted.
Disclosure of Invention
Aiming at the problems in the prior art, the technical scheme adopted by the invention for solving the problems in the prior art is as follows:
a preparation method of carbon sequestration type commercial concrete waste slurry comprises the following steps:
step 1, collecting waste slurry A of a commercial concrete mixing plant, collecting the waste slurry A in a sedimentation tank, and pumping the waste slurry A into a concentration tank by a slurry pump;
step 2, adding 0.1% -1% of chemical precipitator into the concentration tank to precipitate the commercial concrete waste slurry in the concentration tank for 1-2 hours to obtain concentrated waste slurry B;
step 3, mixing 150-200 parts by weight of the concentrated waste slurry B in the concentration tank in the step 2 with 300-400 parts by weight of zirconia balls, grinding in a vertical stirred ball mill for 10-30 min, and introducing CO with the concentration of 80-100% and the gas speed of 6-8 parts/h in the grinding process 2 And obtaining the carbon-fixing type commercial concrete waste slurry with the median particle size of 3-9 mu m after grinding.
And the slurry A in the step 1 is waste slurry obtained by cleaning a field, cleaning a stirring truck, cleaning a stirring instrument, separating sand and stone and the like.
In the step 1, the slurry A consists of mineral phases such as unhydrated cement slurry, mineral powder, fly ash, a small amount of fine sand and the like.
In the step 1, the solid content of the slurry A is 10-20%, and the pH value is more than 12.
The purpose of the sealing and sealing of the concentration tank is to prevent the slurry from carbonizing.
And the precipitator in the step 2 is a chemical precipitator mixed with one or both of polymeric ferric sulfate and polyacrylamide.
The concentrated waste slurry B in the step 2 is formed by mechanically interlocking hydrated cement, mineral powder, fly ash and a small amount of fine sand, and the solid content is 30-45%;
the zirconia grinding ball grading in the step 3 is as follows: 1.5-1.2mm:1.2-0.8mm:0.8-0.6mm =1:2:2-2:1:1, the rotation speed of a wet grinder is 400r/min-800r-min until the pH of the slurry is =7.2-7.8, and the introduction of CO is stopped 2 ；
The application method of the carbon-fixing type commercial concrete waste slurry comprises the step of doping the carbon-fixing type commercial concrete waste slurry into premixed concrete to replace 5-15% of the cement consumption.
The mechanism of the invention is as follows:
the commercial concrete waste slurry is rich in metal cations such as Ca, na, mg and the like, and generates carbon mineralization reaction with carbonate in the solution. The severe mechanical force in the wet grinding process is utilized to control the particle size range of the waste slurry of the commercial concrete, increase the contact area of the particle surface and accelerate the dissolution of ions. Due to CO 3 2- The ions are continuously supplemented to fully react with metal cations such as Ca, na, mg and the like in the waste slurry of the commercial concrete, thereby improving the carbon fixation rate. Meanwhile, the commercial concrete waste slurry is subjected to a carbon mineralization reaction quickly, so that metastable vaterite crystal form calcium carbonate is easily formed, and the vaterite has a promoting effect in a cement hydration process due to the instable state of the vaterite, so that the reduction of the mechanical property of the ready-mixed concrete is not obvious.
The invention has the following advantages:
(1) The particle size of the commercial concrete waste slurry is controlled by using a wet grinding process, the preparation process is simple, the operation is convenient, the particle range is controllable, the cost is low, the carbon sequestration rate is high, and the method is suitable for industrial large-scale production.
(2) Metal cations such as Ca, na, mg and the like in the waste slurry of the commercial concrete are utilized to carry out carbon mineralization reaction with carbonate in the solution. The carbonization efficiency of the solid waste slurry is greatly improved, and a feasible application approach is provided for solid waste materials in the field of solid carbon, so that the win-win purpose of double carbon target and resource utilization is achieved.
(3) The pH value of the commercial concrete waste slurry solution is reduced to 7 by utilizing a wet grinding process and a carbon mineralization technology, and the carbon-fixing type commercial concrete waste slurry is added into concrete instead of cement, so that the dosage of an additive is reduced. The cement hydration is promoted by using the calcium carbonate in the metastable vaterite crystal form formed by the rapid carbon mineralization reaction. The influence of the commercial concrete waste slurry on the workability of the concrete and the dosage of the additive are improved on the basis of realizing the high added value utilization of the carbon dioxide of the commercial concrete waste slurry. The whole economic benefit of the application of the commercial concrete waste slurry is improved.
Detailed Description
The technical solution of the present invention is further specifically described below by way of examples.
Example 1:
collecting the waste slurry A of the commercial concrete mixing plant, collecting the waste slurry A in a sedimentation tank, and pumping the waste slurry A into a concentration tank by a slurry pump; adding 0.1% of chemical precipitator into the concentration pipe to precipitate the commercial concrete waste slurry in the concentration tank for 1h; taking 150 parts of concentrated waste slurry B in a concentration tank, mixing 300 parts of zirconia balls, placing the mixture in a vertical stirred ball mill for grinding for 10min, wherein the rotating speed of a wet grinder is 400r/min, and the zirconia ball grading: 1.5:1.2:0.8=1:2:2. introducing CO with the concentration of 80 percent and the gas speed of 6 parts/h in the grinding process 2 Obtaining carbon-fixing type commercial concrete waste slurry C after grinding is finished; and (3) mixing the carbon-fixing type commercial concrete waste slurry C into C30 ready-mixed concrete instead of 5% of cement. The solid content of the slurry A and the solid content of the slurry B, the particle size of the slurry C and the carbon fixation rate of the slurry are shown in the table 1, the slump constant of concrete and the dosage of additives are shown in the table 2, and the compressive strength of the concrete is shown in the table 2.
Example 2:
collecting the waste slurry A of the commercial concrete mixing plant, collecting the waste slurry A in a sedimentation tank, and pumping the waste slurry A into a concentration tank by a slurry pump; adding 0.5% chemical precipitator into the concentration pipe to precipitate the commercial concrete waste slurry in the concentration tank for 1.5h; and (3) mixing 225 parts of concentrated waste slurry B in a concentration tank and 300 parts of zirconia balls, grinding for 20min in a vertical stirred ball mill at the rotation speed of 600r/min of a wet grinder, and grading the zirconia balls: 1.5:1.2:0.8=1:2:2. introducing CO with the concentration of 90 percent and the gas speed of 7 parts/h in the grinding process 2 Obtaining carbon-fixing type commercial concrete waste slurry C after grinding is finished; and (3) mixing the carbon-fixing type commercial concrete waste slurry C into C30 ready-mixed concrete instead of 10% cement. The solid content of the slurry A and the solid content of the slurry B, the particle size and the carbon fixation rate of the slurry C are shown in table 1, the slump constant and the additive dosage are shown in table 2, and the compressive strength of the concrete is shown in table 2.
Example 3:
collecting the waste slurry A of the commercial concrete mixing plant, collecting the waste slurry A in a sedimentation tank, and pumping the waste slurry A into a concentration tank by a slurry pump; adding 1% of chemical precipitator into the concentration pipe to precipitate the commercial concrete waste slurry in the concentration tank for 2 hours; taking 300 parts of concentrate in a concentration tankMixing the waste slurry B with 300 parts of zirconia balls, grinding for 30min in a vertical stirring ball mill at the rotation speed of 800r/min, grading the zirconia balls: 1.5:1.2:0.8=1:2:2. introducing CO with the concentration of 100% and the gas speed of 8 parts/h in the grinding process 2 Obtaining carbon-fixing type commercial concrete waste slurry C after grinding; and (3) mixing the carbon-fixing type commercial concrete waste slurry C into C30 premixed concrete instead of 15 percent of cement. The solid content of the slurry A and the solid content of the slurry B, the particle size of the slurry C and the carbon fixation rate of the slurry are shown in the table 1, the slump constant of concrete and the dosage of additives are shown in the table 2, and the compressive strength of the concrete is shown in the table 2.
Example 4:
collecting the waste slurry A of the commercial concrete mixing plant, collecting the waste slurry A in a sedimentation tank, and pumping the waste slurry A into a concentration tank by a slurry pump; adding 0.5% of chemical precipitator into the concentration pipe to precipitate the commercial concrete waste slurry in the concentration tank for 2 hours; taking 225 parts of concentrated waste slurry B in a concentration tank, mixing 400 parts of zirconia balls, placing the mixture in a vertical stirred ball mill for grinding for 30min, wherein the rotating speed of a wet grinder is 800r/min, and the zirconia ball grading: 1.5:1.2:0.8=2:1:1. introducing CO with the concentration of 100% and the gas speed of 8 parts/h in the grinding process 2 Obtaining carbon-fixing type commercial concrete waste slurry C after grinding is finished; and (3) mixing the carbon-fixing type commercial concrete waste slurry C into C30 ready-mixed concrete instead of 10% cement. The solid content of the slurry A and the solid content of the slurry B, the particle size and the carbon fixation rate of the slurry C are shown in table 1, the slump constant and the additive dosage are shown in table 2, and the compressive strength of the concrete is shown in table 2.
Comparative example 1:
collecting the waste slurry A of the commercial concrete mixing plant, collecting the waste slurry A in a sedimentation tank, and pumping the waste slurry A into a concentration tank by a slurry pump; adding 0.5% chemical precipitator into the concentration pipe to precipitate the commercial concrete waste slurry in the concentration tank for 1.5h; taking 225 parts of concentrated waste slurry B in a concentration tank; the concentrated commercial mixed waste slurry B is doped into C30 ready-mixed concrete instead of 10 percent of cement, the solid content of the slurry A is shown in the table 1, the solid content of the slurry B is shown in the table 2, the slump constant of the concrete and the dosage of additives are shown in the table 2, and the compressive strength of the concrete is shown in the table 2.
Blank group: and C30 grade concrete.
Table 1 slurry related data
TABLE 2 concrete related data
From the data associated with the slurries in table 1, it is seen that as the chemical precipitant increases, the solids content of the concentrated spent slurry increases from 11% to 45%; as the time of the vertical stirred ball mill increased, the particle size of the concentrated waste slurry also decreased, from the first 18 μm to 3 μm. Compared with the comparative example 1, the embodiment utilizes the violent mechanical force of the wet grinding process to ultra-fine the commercial concrete waste slurry particles, so that the particle size is greatly reduced, the contact area between the particle surface and carbon dioxide is increased, the carbon sequestration rate is further increased, and the carbon sequestration rate of 3% of the original natural carbon mineralization is increased to 15% and increased by 500%.
As can be seen from Table 2, the additive amount of the admixture for ready-mixed concrete of blank group C30 was 6.3 parts. Although the waste slurry B is used for replacing cement to help reduce the use of the cement and further reduce the carbon emission, the workability of concrete is negatively influenced by the replacement of the cement in the concrete due to the high alkalinity of the commercial concrete waste slurry, and the using amount of the additive is increased from 6.3 parts to 9 parts. The invention utilizes wet grinding to carry out ultra-fining on the commercial concrete waste slurry, and simultaneously introduces carbon dioxide gas to neutralize the environmental pH value of the waste slurry solution. Improves the workability of adding commercial mixed waste slurry into concrete instead of cement, and reduces the dosage of additives. Meanwhile, the commercial mixed waste slurry is subjected to rapid carbon mineralization reaction to form a large amount of metastable vaterite crystal form calcium carbonate, and the vaterite plays a promoting role in the cement hydration process, so that the mechanical property of the ready-mixed concrete doped with the commercial mixed waste slurry instead of cement is not obviously reduced. The invention not only can carry out large-scale industrial production, but also improves the dosage of the additive on the basis of the prior application of the commercial concrete waste slurry, and has wide application prospect.
The protective scope of the present invention is not limited to the above-described embodiments, and it is apparent that various modifications and variations can be made to the present invention by those skilled in the art without departing from the scope and spirit of the present invention. It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
Claims (8)
1. The preparation method of the carbon sequestration type commercial concrete waste slurry is characterized by comprising the following steps:
step 1, collecting waste slurry A of a commercial concrete mixing plant, collecting the waste slurry A in a sedimentation tank, and pumping the waste slurry A into a concentration tank by a slurry pump;
step 2, adding 0.1% -1% of chemical precipitator into the concentration tank to precipitate the commercial concrete waste slurry in the concentration tank for 1-2 hours to obtain concentrated waste slurry B;
step 3, mixing 150-200 parts by weight of the concentrated waste slurry B in the concentration tank in the step 2 with 300-400 parts by weight of zirconia balls, grinding in a vertical stirred ball mill for 10-30 min, and introducing CO with the concentration of 80-100% and the gas speed of 6-8 parts/h in the grinding process 2 And obtaining the carbon-fixing type commercial concrete waste slurry with the median particle size of 3-9 mu m after grinding.
2. The method for preparing the carbon sequestration type commercial concrete waste slurry as claimed in claim 1, wherein the method comprises the following steps: and the slurry A in the step 1 is waste slurry obtained by cleaning a field, cleaning a stirring truck, cleaning a stirring instrument and separating sand and stone.
3. The method for preparing the carbon sequestration type commercial concrete waste slurry as claimed in claim 1, characterized in that: the slurry A in the step 1 comprises unhydrated cement slurry, mineral powder, fly ash and fine placer.
4. The method for preparing the carbon sequestration type commercial concrete waste slurry as claimed in claim 1, characterized in that: in the step 1, the solid content of the slurry A is 10-20%, and the pH value is more than 12.
5. The method for preparing the carbon sequestration type commercial concrete waste slurry as claimed in claim 1, wherein the method comprises the following steps: and the precipitator in the step 2 is a chemical precipitator mixed with one or both of polymeric ferric sulfate and polyacrylamide.
6. The method for preparing the carbon sequestration type commercial concrete waste slurry as claimed in claim 1, characterized in that: and in the step 2, the concentrated waste slurry B is formed by mechanically interlocking hydrated cement, mineral powder, fly ash and a small amount of fine sand, and the solid content is 30-45%.
7. The method for preparing the carbon sequestration type commercial concrete waste slurry as claimed in claim 1, wherein the method comprises the following steps: the zirconia grinding ball grading in the step 3 is as follows: 1.5-1.2mm:1.2-0.8mm:0.8-0.6mm =1:2:2-2:1:1, the rotation speed of a wet grinder is 400r/min-800r-min until the pH of the slurry is =7.2-7.8, and the CO is stopped from being introduced 2 。
8. The application method of the carbon-fixing type commercial concrete waste slurry as claimed in any one of claims 1 to 7 comprises the following steps: the carbon-fixing type commercial concrete waste slurry is doped into the premixed concrete to replace 5 to 15 percent of the cement consumption.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116177960A (en) * | 2023-03-06 | 2023-05-30 | 湖北工业大学 | Method for preparing ready-mixed concrete by wet carbon fixation of water slag |
| CN116283014A (en) * | 2023-03-03 | 2023-06-23 | 湖北工业大学 | Method for recycling waste water and waste slurry of concrete ready-mix plant without precipitation and carbonization |
| CN116283089A (en) * | 2023-03-03 | 2023-06-23 | 湖北工业大学 | Preparation method of commercial mixing station carbon fixation reinforced recycled aggregate |
| CN116283142A (en) * | 2023-03-03 | 2023-06-23 | 湖北工业大学 | Commercial mixing station carbon fixation ready-mixed concrete and preparation method thereof |
| CN116396018A (en) * | 2023-03-03 | 2023-07-07 | 湖北工业大学 | Method for preparing nano-micron crystal nucleus additive by utilizing commercial mixing station waste slurry and wastewater integrated carbon fixation |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116283014A (en) * | 2023-03-03 | 2023-06-23 | 湖北工业大学 | Method for recycling waste water and waste slurry of concrete ready-mix plant without precipitation and carbonization |
| CN116283089A (en) * | 2023-03-03 | 2023-06-23 | 湖北工业大学 | Preparation method of commercial mixing station carbon fixation reinforced recycled aggregate |
| CN116283142A (en) * | 2023-03-03 | 2023-06-23 | 湖北工业大学 | Commercial mixing station carbon fixation ready-mixed concrete and preparation method thereof |
| CN116396018A (en) * | 2023-03-03 | 2023-07-07 | 湖北工业大学 | Method for preparing nano-micron crystal nucleus additive by utilizing commercial mixing station waste slurry and wastewater integrated carbon fixation |
| CN116396018B (en) * | 2023-03-03 | 2024-05-17 | 湖北工业大学 | Method for preparing nano-micron crystal nucleus additive by utilizing commercial mixing station waste slurry and wastewater integrated carbon fixation |
| CN116177960A (en) * | 2023-03-06 | 2023-05-30 | 湖北工业大学 | Method for preparing ready-mixed concrete by wet carbon fixation of water slag |
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