CN116283037A - Commercial mixing station carbon fixation admixture, preparation method and application thereof - Google Patents
Commercial mixing station carbon fixation admixture, preparation method and application thereof Download PDFInfo
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- 238000002156 mixing Methods 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title claims abstract description 27
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- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 23
- 238000000227 grinding Methods 0.000 claims abstract description 67
- 239000002002 slurry Substances 0.000 claims abstract description 51
- 239000007789 gas Substances 0.000 claims abstract description 46
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
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- 239000002699 waste material Substances 0.000 claims description 20
- 238000001238 wet grinding Methods 0.000 claims description 20
- 238000004519 manufacturing process Methods 0.000 claims description 14
- 238000005406 washing Methods 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 8
- 239000004568 cement Substances 0.000 claims description 7
- 239000011395 ready-mix concrete Substances 0.000 claims description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 6
- 229920001661 Chitosan Polymers 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical group O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 6
- 238000009835 boiling Methods 0.000 claims description 6
- 239000003638 chemical reducing agent Substances 0.000 claims description 6
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- 241000238557 Decapoda Species 0.000 claims description 5
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- 230000009919 sequestration Effects 0.000 claims description 4
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
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- 238000007873 sieving Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 238000001291 vacuum drying Methods 0.000 claims description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 2
- 238000013329 compounding Methods 0.000 claims 1
- 238000001035 drying Methods 0.000 claims 1
- 238000011010 flushing procedure Methods 0.000 claims 1
- 229910021487 silica fume Inorganic materials 0.000 abstract description 12
- 239000010881 fly ash Substances 0.000 abstract description 9
- 239000002910 solid waste Substances 0.000 abstract description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 4
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- 238000003801 milling Methods 0.000 abstract description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 26
- 229910000019 calcium carbonate Inorganic materials 0.000 description 8
- 239000011575 calcium Substances 0.000 description 7
- 238000006467 substitution reaction Methods 0.000 description 6
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 5
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- UGKDIUIOSMUOAW-UHFFFAOYSA-N iron nickel Chemical compound [Fe].[Ni] UGKDIUIOSMUOAW-UHFFFAOYSA-N 0.000 description 3
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 2
- 125000005211 alkyl trimethyl ammonium group Chemical class 0.000 description 2
- 229910001424 calcium ion Inorganic materials 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 229920005646 polycarboxylate Polymers 0.000 description 2
- 102000004169 proteins and genes Human genes 0.000 description 2
- 108090000623 proteins and genes Proteins 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 229910021532 Calcite Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
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- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 239000011456 concrete brick Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
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Images
Classifications
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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
- 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
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
- C04B40/0046—Premixtures of ingredients characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland 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
- 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
-
- 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)
- Inorganic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a commercial mixing station carbon fixation admixture, a preparation method and application thereof. The preparation process of the admixture comprises the following steps: 1000-1200 parts by mass of commercial mixed waste slurry, 80-100 parts by mass of recycled concrete micro powder, 500-600 parts by mass of water, 100-120 parts by mass of crystal form regulator, 1000-1200 parts by mass of grinding medium and 10-15 parts by mass of surfactant are added into a wet mill, and CO is introduced after pre-milling 2 And (3) controlling the gas speed in the grinding process, and grinding the mixed gas under normal pressure in the grinding environment, and finishing grinding when the reaction finishing condition is reached, so as to obtain the solid waste commercial mixed waste slurry carbon-fixing admixture. The carbon-fixing admixture is mixed into ready-mixed concrete to replace the admixture such as fly ash, mineral powder, silica fume and the like. The invention realizes the high added value utilization of carbon dioxide and the green utilization of commercial mixed solid waste resources, and has the advantages of simple preparation process, low cost and high activity index.
Description
Technical Field
The invention belongs to the technical fields of carbon dioxide sealing and industrial solid waste resource utilization, and particularly relates to a commercial mixing station carbon fixation admixture, a preparation method and application thereof.
Background
At present, along with the rapid development of the building industry, the production of premixed concrete is increasingly growing as one of the most main raw materials in the building industry, but a large amount of commercially mixed waste slurry is generated in various links of the commercially mixed mixing plant, the concrete transport vehicle and the like for participating in the preparation and transport of the concrete, and the production of the commercially mixed concrete also causes environmental pollution.
The waste slurry is often used for producing recycled concrete aggregate and manufacturing common concrete bricks, but the actual utilization rate is not high, and more commercial mixing stations directly perform landfill treatment, so that waste is caused, and serious pollution is caused to the environment. The preparation of active admixture by using the commercial mixed waste slurry is less common, and the method for preparing the admixture by using the commercial mixed waste slurry comprises the following steps: thermochemical excitation, chemical titration, and the like, and is used as an admixture to be added into the preparation of ready-mixed concrete after being treated by the methods. But has the problems of higher energy consumption, complex process, low substitution rate, lower activity index and the like.
The preparation method of the composite active admixture for concrete comprises the steps of firstly separating metal nickel iron particles mixed in nickel iron slag by magnetic separation, and obtaining the composite active admixture after light-burning, activating, roasting, mechanical grinding and chemical excitation of the residual nickel iron slag. Compared with the prior art, the invention has wide sources of production raw materials and high realization degree of technical routes. However, the process is complicated, the energy consumption is high, and more additive is needed to be added in the production process.
The regenerated active admixture as described in patent number CN201510549555.6 and its preparation process consists of regenerated concrete micro powder and regenerated glass micro powder. In the prepared regenerated active admixture, the regenerated concrete micro powder has lower activity and higher glass activity, and the composite application of the regenerated active admixture and the glass has the advantage that the activity of the regenerated concrete fine aggregate micro powder can be improved. But the growth period is longer, the activity index is far lower than 95%, and the substitution rate is lower.
Disclosure of Invention
Aiming at the problems in the prior art, the main purpose of the invention is to provide a commercial mixing station carbon fixing admixture, and a preparation method and application thereof. The preparation method takes commercial mixed waste slurry as a raw material, and cooperated with the regenerated concrete micro powder, the wet grinding is utilized, and CO trapped by a purification process of a cement plant is efficiently sealed and stored 2 And mixing the gases to prepare the commercial mixing station carbon fixation admixture.
The invention utilizes the solid waste system to combine the wet grinding process of the subject group, realizes the superfine of solid waste particles based on the mechanical force and fluidization of the wet grinding process, and evenly distributes the refined particles in a wet grinding tank and CO 2 Rapidly reacting and under the action of a crystal form regulating agent, generating a large amount of micro-nano metastable needle-like aragonite calcium carbonate and vaterite calcium carbonate seed crystals, and increasing CO based on the specificity of high-pressure treatment 2 The solubility and diffusion coefficient in water reduce the interfacial resistance of the solution. The prepared commercial mixed waste slurry carbon fixation admixture directly replaces the admixture such as fly ash, silica fume, mineral powder and the like, realizes the green utilization of solid waste resources, realizes the integrated green process flow of high-valued utilization of carbon dioxide, relieves the carbon emission pressure, and has application prospect in the actual production process of premixed concrete.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
in a first aspect, the invention provides a method for preparing a commercial mixing station carbon fixation admixture, comprising the following steps:
step one: adding 1000-1200 parts by mass of commercial mixed waste slurry A, 80-100 parts by mass of recycled concrete micro powder, 500-600 parts by mass of water, 100-120 parts by mass of crystal form regulator, 1000-1200 parts by mass of grinding medium and 10-15 parts by mass of surfactant into a wet grinding tank for pre-grinding;
step two: introducing CO into the grinding tank after the main grinding is started 2 And (3) maintaining the normal pressure state of the mixed gas in a grinding environment, carrying out water bath cooling in the grinding process, keeping the temperature to fluctuate within the range of 35-40 ℃, and stopping grinding to obtain the commercial mixing station carbon fixation admixture by observing the gas velocity table to reach the reaction ending standard.
Further, in the first step, the commercial mixed waste slurry A is obtained by washing a site, cleaning a mixer truck and a mixing tank with water and filtering sand stone, wherein the median particle size of the waste slurry A is 20-50 mu m, the solid content of the waste slurry A is more than or equal to 50%, and the pH value is 10-13; the particle diameter of the recycled concrete micro powder is less than 50 mu m.
Further, in the first step, the wet mill is set to have a premilled rotating speed of 100-150r/min, and the grinding medium is zirconia, agate balls and steel balls according to the mass ratio of 2-3:1-2: 1-2.
Further, in the first step, the crystal form regulator is polyacrylamide, cetyl trimethyl ammonium bromide and waste slurry-chitosan solution, and the mass ratio is 1-2:1-2: 8-10.
Further, the treatment method of the waste slurry-chitosan solution comprises the following steps: washing 100-120 parts by mass of crab shells and shrimp shells for 5-6min, washing in running water for 2-3min, vacuum drying for 5-8min after washing, putting the dried crab shells and shrimp shells into a crusher for treatment, sieving with a 0.45mm sieve to obtain mixed shell micro powder, carrying out alkaline boiling on the mixed shell micro powder by using 150-180 parts by mass of commercial mixed waste pulp for protein removal for 10-15min, and carrying out alkaline boiling at 80-85 ℃.
Further, the surfactant is one or two of quaternary ammonium salt and polycarboxylic acid water reducer. Preferably, the surfactant is a composite of a polycarboxylate water reducer (Su Bote-concrete high-efficiency water reducer) and a quaternary ammonium salt surfactant (alkyl trimethyl ammonium salt).
In the second step, the rotating speed in the formal grinding process is 400-500r/min.
In the second step, the median particle size of the commercial mixing station carbon fixation admixture is 2-6 mu m, the solid content is more than or equal to 50%, the slurry activity index is more than 100%, and the pH value is 7-8.
Further, in step two, CO 2 The mixed gas is concentrated flue gas trapped in a cement plant, and CO in the flue gas 2 Purity of more than 50%, CO 2 The gas speed of the mixed gas is 10-12 parts by mass/min, and the grinding environment pressure is maintained at 13-15Mpa.
In the second step, the reaction ending standard is that the gas inlet gas speed is equal to the gas outlet gas speed and is kept above 1min, and the reaction ending standard is the reaction ending standard.
In a second aspect, the invention provides a commercial mixing station carbon sequestration admixture prepared by the method of the first aspect.
In a third aspect, the invention provides the use of the commercial mixing station carbon sequestration admixture of the second aspect as an admixture in the preparation of ready-mix concrete.
Further, the admixture is used for replacing the admixture such as fly ash, mineral powder and the like, and the replacement amount is 90-100wt%.
The mechanism of the invention is as follows:
the commercial mixed waste slurry is rich in a large amount of calcium-based substances, wherein calcium ions can react with CO in the solution through carbonation 3 2- Combined with each other and under the action of adding the crystal form regulator into the grinding environment, ca of the calcium-based particles 2+ With CO 3 2- The combination produced metastable aragonite and vaterite type calcium carbonate seeds. The superfine grinding of waste slurry particles and regenerated concrete micro powder particles is realized by utilizing the intense mechanical force generated by the wet grinding process, and Ca is promoted 2+ And (3) dissolving out, and uniformly distributing the calcium-based reaction particles in the solution. CO in high pressure environment 2 The solubility and the diffusion coefficient in the grinding solution are obviously improved, the interfacial resistance of the solution is reduced, and the CO is caused 2 Rapid and Ca after carbonation process 2+ The combination of the production of metastable aragonite and vaterite calcium carbonate inhibits the conversion of metastable calcium carbonate to steady state calcite calcium carbonate under the action of the crystalline form modulator. The metastable aragonite type and vaterite type calcium carbonate has the characteristic of thermodynamic instability, can be used as a gel, can promote the aggregation of cement particles, and can accelerate the hydration process of the cement particles.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention provides a preparation method of a commercial mixing station carbon fixation admixture, which adopts commercial mixing waste slurry as a raw material to carry out ore carbonization reaction, and solid waste carbon fixation integration is beneficial to relieving commercial mixing station waste slurry and greenhouse gas CO 2 A series of pollution problems are brought, and the green utilization of industrial waste and waste gas is realized.
(2) The invention provides a preparation method of a commercial mixing station carbon fixation admixture, which combines a wet grinding process with a high-pressure grinding environment to realize the ultrafine of calcium-based particles, promote the dissolution of calcium ions, and simultaneously uniformly distribute the calcium-based particles in a solution to enable CO 2 Rapid dissolution and diffusion in the milling solution eventually results in a large number of metastable aragonite and vaterite type calcium carbonate seeds that enhance the admixture activity.
(3) The invention provides an application method of a commercial mixing station carbon fixation admixture, which can reduce the pH value of waste slurry to be neutral, and the commercial mixing station carbon fixation admixture replaces 90% -100% of coal ash, silica fume, mineral powder and other external admixtures to be added into the preparation of commercial mixing station ready-mixed concrete, thereby improving the working performance and strength of the concrete and greatly exerting the potential value of commercial mixing waste slurry.
Drawings
FIG. 1 is a flow chart of the preparation and application of a commercial mixing station carbon sequestration admixture provided by the invention.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention will be further illustrated, but is not limited, by the following examples.
In the following examples, parts are mass parts, and substitution rates are mass substitution rates of other commercially available blends, unless otherwise specified.
In the following embodiments, the commercial mixed waste slurry A is obtained by washing a site, cleaning a mixer truck and a mixing tank with water, filtering with sand stone, wherein the median particle size of the waste slurry A is 20-50 mu m, the solid content of the waste slurry A is more than or equal to 50%, and the pH value is 10-13; the particle diameter of the recycled concrete micro powder is less than 50 mu m.
In the following examples, the recycled concrete fine powder was derived from a broken building, and the recycled concrete fine powder was obtained by grinding after the waste concrete was crushed, and mainly contains SiO 2 Substances C-S-H and CaCO 3 And the like.
The raw materials and the substitution rates of the blending materials such as the fly ash, the silica fume and the like according to the embodiments 1 to 6 of the invention are shown in the following table 1:
table 1 example formulation and parameter table
Example 1
Step one: adding 1000 parts by mass of commercial mixed waste slurry A, 100 parts by mass of recycled concrete micro powder, 600 parts by mass of water, 100 parts by mass of crystal form regulator, 1000 parts by mass of grinding medium and 10 parts by mass of surfactant into a wet grinding tank for pre-grinding for 2min;
step two: introducing CO into the grinding tank after the main grinding is started 2 The grinding speed of the mixed gas is 400r/min, the gas feeding speed of the mixed gas is 10 parts by mass/min, the grinding environment pressure is maintained in a normal pressure state, the water bath is carried out for cooling in the wet grinding process, the temperature is kept to fluctuate within the range of 35-40 ℃, the reaction finishing standard is reached by observing a gas speed meter, the reaction is stopped, and the slurry B is obtained, and the median particle size of the slurry B is 6 mu m;
step three: slurry B was used as an admixture to replace 90% of the silica fume during the preparation of ready-mix concrete.
In the first step, the crystal form regulator is polyacrylamide, cetyl trimethyl ammonium bromide and waste slurry-chitosan solution, and the mass ratio is 1-2:1-2: 8-10. The treatment method of the waste slurry-chitosan solution comprises the following steps: washing 100-120 parts by mass of crab shells and shrimp shells for 5-6min, washing in running water for 2-3min, vacuum drying for 5-8min after washing, putting the dried crab shells and shrimp shells into a crusher for treatment, sieving with a 0.45mm sieve to obtain mixed shell micro powder, carrying out alkaline boiling on the mixed shell micro powder by using 150-180 parts by mass of commercial mixed waste pulp for protein removal for 10-15min, and carrying out alkaline boiling at 80-85 ℃. The crystal form modulators in examples 2 to 6 are all the same as in example 1.
In the first step, the grinding medium is zirconia, agate balls and steel balls according to the mass ratio of 2-3:1-2: 1-2. The grinding media in examples 2-6 were all the same as in example 1.
In the first step, the surfactant is a composite of a polycarboxylate water reducer (Su Bote-concrete high-efficiency water reducer) and a quaternary ammonium salt surfactant (alkyl trimethyl ammonium salt). The surfactant in examples 2-6 was the same as in example 1.
In the second step, the CO 2 The mixed gas is concentrated flue gas trapped in a cement plant, and CO in the flue gas 2 The purity is more than 50 percent.
CO in examples 2 to 6 2 The mixture was the same as in example 1.
Example 2
Step one: adding 1000 parts by mass of commercial mixed waste slurry A, 80 parts by mass of recycled concrete micro powder, 600 parts by mass of water, 120 parts by mass of crystal form regulator, 1200 parts by mass of grinding medium and 15 parts by mass of surfactant into a wet grinding tank for pre-grinding for 2min;
step two: introducing CO into the grinding tank after the main grinding is started 2 The grinding speed of the mixed gas is 400r/min, the gas feeding speed of the mixed gas is 12 parts by mass/min, the grinding environment pressure is maintained in a normal pressure state, the water bath is carried out for cooling in the wet grinding process, the temperature is kept to fluctuate within the range of 35-40 ℃, the reaction is stopped by observing a gas speed meter to obtain slurry B, and the median particle size of the slurry B is 6 mu m;
step three: in the preparation process of the ready-mixed concrete, the slurry B is used as an admixture to replace 100% of the external admixture such as fly ash, silica fume and the like.
Example 3
Step one: adding 1200 parts by mass of commercial mixed waste slurry A, 100 parts by mass of recycled concrete micro powder, 500 parts by mass of water, 120 parts by mass of crystal form regulator, 1200 parts by mass of grinding medium and 14 parts by mass of surfactant into a wet grinding tank for pre-grinding for 2min;
step two: introducing CO into the grinding tank after the main grinding is started 2 The grinding speed of the mixed gas is 500r/min, the gas feeding speed of the mixed gas is 11 parts by mass/min, the grinding environment pressure is maintained in a normal pressure state, water bath cooling is carried out in the wet grinding process, the temperature is kept to fluctuate within the range of 35-40 ℃, the reaction finishing standard is reached by observing a gas speed meter, the reaction is stopped, and the slurry B is obtained, and the median particle size of the slurry B is 2 mu m;
step three: slurry B was used as an admixture to replace 100% of silica fume during the preparation of ready-mix concrete.
Example 4
Step one: adding 1200 parts by mass of commercial mixed waste slurry A, 90 parts by mass of recycled concrete micro powder, 550 parts by mass of water, 115 parts by mass of crystal form regulator, 1100 parts by mass of grinding medium and 12 parts by mass of surfactant into a wet grinding tank for pre-grinding for 2min;
step two: introducing CO into the grinding tank after the main grinding is started 2 The grinding speed of the mixed gas is 450r/min, the gas feeding speed of the mixed gas is 10 parts by mass/min, the grinding environment pressure is maintained in a normal pressure state, water bath cooling is carried out in the wet grinding process, the temperature is kept to fluctuate within the range of 35-40 ℃, the reaction finishing standard is reached by observing a gas speed meter, the reaction is stopped, and the slurry B is obtained, and the median particle size of the slurry B is 4 mu m;
step three: slurry B was used as an admixture to replace 95% of silica fume during the preparation of ready-mix concrete.
Example 5
Step one: adding 1100 parts by mass of commercial mixed waste slurry A, 85 parts by mass of recycled concrete micro powder, 580 parts by mass of water, 110 parts by mass of crystal form regulator, 1150 parts by mass of grinding medium and 13 parts by mass of surfactant into a wet grinding tank for pre-grinding for 2min;
step two: introducing CO into the grinding tank after the main grinding is started 2 The grinding speed of the mixed gas is 420r/min, the gas feeding speed of the mixed gas is 12 parts by mass/min, the grinding environment pressure is maintained in a normal pressure state, water bath cooling is carried out in the wet grinding process, the temperature is kept to fluctuate within the range of 35-40 ℃, the reaction finishing standard is reached by observing a gas speed meter, the reaction is stopped, and the slurry B is obtained, and the median particle size of the slurry B is 5 mu m;
step three: slurry B was used as an admixture to replace 98% of the silica fume during the preparation of ready-mix concrete.
Example 6
Step one: 1150 parts by mass of commercial mixed waste slurry A, 95 parts by mass of recycled concrete micro powder, 540 parts by mass of water, 105 parts by mass of crystal form regulator, 1200 parts by mass of grinding medium and 11 parts by mass of surfactant are added into a wet grinding tank to be pre-ground for 2min;
step two: introducing CO into the grinding tank after the main grinding is started 2 The grinding speed of the mixed gas is 480r/min, the gas feeding speed of the mixed gas is 12 parts by mass/min, the grinding environment pressure is maintained in a normal pressure state, water bath cooling is carried out in the wet grinding process, the temperature is kept to fluctuate within the range of 35-40 ℃, the reaction finishing standard is reached by observing a gas speed meter, the reaction is stopped, and the slurry B is obtained, and the median particle size of the slurry B is 3 mu m;
step three: slurry B was used as an admixture to replace 95% of fly ash during the preparation of ready-mix concrete.
Comparative example 1
Only fly ash is taken as an admixture.
Comparative example 2
Only silica fume was taken as an admixture.
The blends of examples 1-6 and comparative examples 1-2 were used to prepare concrete in the following proportions:
table 2 examples and comparative examples concrete preparation proportioning table
The test results were as follows:
table 3 test results of examples and comparative examples
As can be seen from Table 2, the carbon-fixing admixture prepared by the invention can obtain better slump when being used for completely replacing silica fume, can obtain similar slump when being used for replacing fly ash, and is beneficial to improving the working performance of concrete. The carbon-fixing admixture is used for replacing the admixture such as fly ash, silica fume and the like with different proportions to obtain the improvement of the compressive strength of 7d and 28d, the compressive strength of concrete 3d is improved to 2-7%, the compressive strength of concrete 28d is improved to 5-12%, the activity indexes of 7d and 28d are both more than 100%, and the carbon-fixing admixture provided by the invention is used for replacing cement to help to improve the later-stage strength of concrete.
The foregoing is merely illustrative of the preferred embodiments of the present invention and is not intended to limit the embodiments and scope of the present invention, and it should be appreciated by those skilled in the art that equivalent substitutions and obvious variations may be made using the teachings of the present invention, which are intended to be included within the scope of the present invention.
Claims (10)
1. The preparation method of the commercial mixing station carbon fixation admixture is characterized by comprising the following steps of:
step one: adding 1000-1200 parts by mass of commercial mixed waste slurry A, 80-100 parts by mass of recycled concrete micro powder, 500-600 parts by mass of water, 100-120 parts by mass of crystal form regulator, 1000-1200 parts by mass of grinding medium and 10-15 parts by mass of surfactant into a wet grinding tank for pre-grinding;
step two: introducing CO into the grinding tank after the main grinding is started 2 And (3) mixing the gases, maintaining the grinding environment in a normal pressure state, carrying out water bath cooling in the grinding process, keeping the temperature to fluctuate within the range of 35-40 ℃, and stopping grinding to obtain the commercial mixing station carbon fixing admixture by observing the gas velocity table to reach the reaction ending standard.
2. The method of manufacturing according to claim 1, characterized in that: in the first step, the commercial mixed waste slurry A is obtained by flushing a site with water, cleaning a mixer truck and a mixing tank, and filtering with sand stone, wherein the median particle size of the waste slurry A is 20-50 mu m, the solid content of the waste slurry A is more than or equal to 50%, and the pH value is 10-13; the particle diameter of the recycled concrete micro powder is less than 50 mu m.
3. The method of manufacturing according to claim 1, characterized in that: setting the premilled rotating speed of the wet mill to be 100-150r/min, wherein the grinding medium is zirconia, agate balls and steel balls according to the mass ratio of 2-3:1-2: 1-2.
4. The method of manufacturing according to claim 1, characterized in that: the crystal form regulator in the first step is polyacrylamide, cetyl trimethyl ammonium bromide and waste slurry-chitosan solution, and the mass ratio is 1-2:1-2:8-10 compounding; the treatment method of the waste slurry-chitosan solution comprises the following steps: washing 100-120 parts by mass of crab shells and shrimp shells with acid, washing in running water, vacuum drying after washing, sieving after drying in a crusher to obtain mixed shell micro powder, performing alkaline boiling and deproteinizing treatment on the mixed shell micro powder by using 150-180 parts by mass of commercial mixed waste pulp for 10-15min, wherein the alkaline boiling temperature is 80-85 ℃.
5. The method of manufacturing according to claim 1, characterized in that: the surfactant is one or two of quaternary ammonium salt and polycarboxylic acid water reducer.
6. The method of manufacturing according to claim 1, characterized in that: in the second step, the rotating speed in the formal grinding process is 400-500r/min.
7. The method of manufacturing according to claim 1, characterized in that: in the second step, the median particle diameter of the carbon-fixing admixture at the commercial mixing station is 2-6 mu m, the solid content is more than or equal to 50%, and the slurry activity index is equal to>100% and a pH of 7-8; in the second step, CO 2 The mixed gas is concentrated flue gas trapped in a cement plant, and CO in the flue gas 2 Purity of more than 50%, CO 2 The gas velocity of the mixed gas is 10-12 parts by mass/min.
8. The method of manufacturing according to claim 1, characterized in that: in the second step, the reaction ending standard is that the gas inlet gas speed is equal to the gas outlet gas speed and is kept above 1min, and the reaction ending standard is the reaction ending standard.
9. The utility model provides a commercial mixing station solid carbon admixture which characterized in that: a method according to any one of claims 1 to 8.
10. Use of the commercial mix station carbon sequestration admixture of claim 9 as an admixture in the preparation of ready-mix concrete.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116749348A (en) * | 2023-07-31 | 2023-09-15 | 湖北工业大学 | Concrete mixing plant CO 2 System and method for sealing and utilizing |
| CN116969702A (en) * | 2023-07-31 | 2023-10-31 | 湖北工业大学 | Pipe pile factory utilizes CO 2 Method, system and tubular pile for preparing multifunctional glue material |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116749348A (en) * | 2023-07-31 | 2023-09-15 | 湖北工业大学 | Concrete mixing plant CO 2 System and method for sealing and utilizing |
| CN116969702A (en) * | 2023-07-31 | 2023-10-31 | 湖北工业大学 | Pipe pile factory utilizes CO 2 Method, system and tubular pile for preparing multifunctional glue material |
| CN116749348B (en) * | 2023-07-31 | 2024-01-30 | 湖北工业大学 | Concrete mixing plant CO 2 System and method for sealing and utilizing |
| CN116969702B (en) * | 2023-07-31 | 2024-04-26 | 湖北工业大学 | Pipe pile factory utilizes CO2Method, system and tubular pile for preparing multifunctional glue material |
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