CN110282925B - Artificial porous aggregate of carbonized steel slag and preparation method thereof - Google Patents
Artificial porous aggregate of carbonized steel slag and preparation method thereof Download PDFInfo
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- 239000002893 slag Substances 0.000 title claims abstract description 209
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 202
- 239000010959 steel Substances 0.000 title claims abstract description 202
- 238000002360 preparation method Methods 0.000 title claims abstract description 29
- 239000000843 powder Substances 0.000 claims abstract description 39
- 238000003763 carbonization Methods 0.000 claims abstract description 22
- 239000010881 fly ash Substances 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000011398 Portland cement Substances 0.000 claims abstract description 10
- 238000010000 carbonizing Methods 0.000 claims abstract description 10
- 238000005303 weighing Methods 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 230000007613 environmental effect Effects 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 13
- 239000004568 cement Substances 0.000 claims description 12
- 238000000227 grinding Methods 0.000 claims description 10
- 239000006227 byproduct Substances 0.000 claims description 7
- 238000009628 steelmaking Methods 0.000 claims description 6
- 239000004567 concrete Substances 0.000 abstract description 33
- 239000011449 brick Substances 0.000 abstract description 5
- 238000012423 maintenance Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052799 carbon Inorganic materials 0.000 abstract description 2
- 239000002440 industrial waste Substances 0.000 abstract description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 16
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 12
- 229910002092 carbon dioxide Inorganic materials 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 10
- 239000001569 carbon dioxide Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 229910052759 nickel Inorganic materials 0.000 description 6
- 239000002994 raw material Substances 0.000 description 5
- 239000000292 calcium oxide Substances 0.000 description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000004566 building material Substances 0.000 description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000003337 fertilizer Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 239000003895 organic fertilizer Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000011363 dried mixture Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000011372 high-strength concrete Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000010446 mirabilite Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000004058 oil shale Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
- 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
-
- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/0231—Carbon dioxide hardening
- C04B40/0236—Carbon dioxide post-treatment of already hardened material
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/0277—Hardening promoted by using additional water, e.g. by spraying water on the green concrete element
- C04B40/0281—Hardening in an atmosphere of increased relative humidity
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Inorganic Chemistry (AREA)
- Civil Engineering (AREA)
- Processing Of Solid Wastes (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
An artificial porous aggregate of carbonized steel slag and a preparation method thereof, belonging to the technical field of industrial waste slag utilization. The preparation method comprises the following steps: preparing steel slag powder: crushing the steel slag blocks, and putting the obtained crushed steel slag into a mill to be ground into steel slag powder; preparing steel slag ball aggregate: weighing at least one of steel slag powder, portland cement, brick powder and fly ash, mixing, adding water to form balls, and obtaining ball-shaped steel slag aggregate; aggregate pretreatment: pre-curing the spherical steel slag aggregate; carbonizing the steel slag aggregate: and putting the spherical steel slag aggregate after pre-curing into a carbonization kettle for carbonization to obtain the carbonized steel slag artificial porous aggregate. The artificial porous aggregate of carbonized steel slag prepared by the invention has the advantages of high aggregate strength, safety, stability, simple preparation process and equipment, easy operation, low production cost, high efficiency, low carbon, environmental protection and the like. Can satisfy the demand of concrete to aggregate strength and simultaneously provide interior maintenance for the concrete, reduce concrete self-contraction, improve the frost resistance.
Description
Technical Field
The invention belongs to the technical field of industrial waste residue utilization, and particularly relates to a carbonized steel slag artificial porous aggregate and a preparation method thereof.
Background
The steel slag is an industrial byproduct generated in the steel-making process, but the steel slag has low gelling activity and high free CaO and MgO contents, so that the steel slag has poor stability as a gelling material, concrete is easy to expand and crack, and the like, and the doping amount of the steel slag in the building material application is greatly limited. In China, the annual discharge amount of steel slag exceeds one hundred million tons, however, because the whole utilization level of the steel slag is not high, a large amount of steel slag is piled up, harmful metal elements in the steel slag can enter soil to pollute the soil resources which can be ploughed, and meanwhile, the steel slag pile up occupies cultivated land. The carbonization as a novel steel slag treatment means can consume most of free metal oxides during preparation, more efficiently utilize the gelling activity of the steel slag and solve the problems of poor stability hidden danger and poor gelling property of the steel slag.
In recent years, contradictory conflicts between the demand for concrete and its raw materials and the lack of natural resources due to large-scale construction have become more apparent. The resource of natural sandstone aggregate is in short supply, and a new sandstone aggregate source is urgently needed to be found.
Due to the vigorous development of the steel industry, the yield of the byproduct steel slag is high, and the environmental quality is seriously harmed. There have been a few patents directed toThis problem presents a solution. The patent application with publication number CN105294039A discloses a steel slag plant concrete, and proposes to prepare plant concrete by using steel slag aggregate, steel slag composite powder and reinforcing agent, the patent requires that the content of free calcium oxide in the steel slag raw material is less than 2%, but the component fluctuation of the steel slag is large, and the control of the content of the free calcium oxide in the steel slag within 2% is difficult. The patent application with the publication number of CN103864326A discloses a steel slag aggregate and a preparation method thereof, wherein the steel slag is matched with coal slag, lime and mirabilite, the dried mixture is placed in an environment with the temperature of 1260, 1360 ℃ for calcination and heat preservation for 4h, and the steel slag aggregate with gelling activity is finally obtained, the crushing index can reach 12 percent, the compressive strength of concrete formed by utilizing the aggregate at 28d can meet the requirement of C30 concrete, the technology needs to calcine the mixture at high temperature to obtain the aggregate for C30 concrete, the energy consumption is high, the aggregate dosage is large, the economy is poor, and the large-scale industrialization is difficult. The patent application with the publication number of CN108794282A discloses a preparation method of a slow-release fertilizer effect type steel slag aggregate based on carbonation curing, and particularly, the steel slag is used for preparing the slow-release fertilizer effect type steel slag aggregate. According to the application, an organic fertilizer is used as a core, steel slag powder is coated outside the fertilizer and water is sprayed, steel slag balls containing the organic fertilizer are obtained through granulation, and finally, the steel slag balls are carbonized to obtain finished aggregates, heavy metals of the aggregates are filtered out and reduced after carbonization, the compressive strength of the aggregates can reach 3.5-5.0MPa, and the requirements of conventional concrete and high-strength concrete on the quality of the aggregates are difficult to meet. Patent publication No. CN106746814A discloses a preparation method of steel slag aggregate. Crushing and screening steel slag blocks to obtain steel slag blocks with the particle size of 18-25mm, carbonizing the steel slag blocks under certain conditions, wrapping the steel slag blocks by using a mixture obtained by matching paper-making sludge, lime and oil shale residues, and then placing the steel slag blocks in CO with the pressure of 4-6MPa2Carbonizing at 40-60 deg.C and relative humidity of 60-95% for 20-50min under atmosphere, and making the crushing index of the aggregate reach 12.7% preferably. In the technology, the steel slag blocks have large size, are difficult to carbonize fully, have the hidden danger of poor stability, and have various processes and CO2High pressure, requiring compression of high pressure CO2To the equipmentThe requirement is high, and the production cost is increased.
Disclosure of Invention
The technical problem to be solved is as follows: aiming at the problems of low strength, poor stability hidden danger, high cost, complex working procedures, high technical process requirement, difficulty in large-scale industrial production, popularization and application and the like of the steel slag aggregate in the prior art, the invention provides the artificial porous aggregate of carbonized steel slag and the preparation method thereof, and the artificial porous aggregate of carbonized steel slag has the advantages of high aggregate strength, safety and stability, simple preparation process and equipment, easiness in operation, low production cost, high efficiency, low carbon, environmental protection and the like.
The technical scheme is as follows: a preparation method of artificial porous aggregate of carbonized steel slag comprises the following steps:
firstly, preparing steel slag powder: crushing the steel slag block, putting the obtained crushed steel slag into a mill, and grinding until the specific surface area is 100-280m2Per gram of steel slag powder;
step two, preparation of steel slag ball aggregate: weighing 30-100 parts by mass of steel slag powder, 5-20 parts by mass of portland cement, 0-60 parts by mass of at least one of brick powder and fly ash, mixing, and adding water according to a water-cement ratio of 0.19 to form balls to obtain spherical steel slag aggregate;
step three, aggregate pretreatment: pre-curing the spherical steel slag aggregate obtained in the step two, keeping the relative humidity of the environment at 40-98 percent and the temperature at 20-60 ℃, and curing for 0-7 d;
step four, carbonizing the steel slag aggregate: putting the pre-cured spherical steel slag aggregate into a carbonization kettle, and introducing CO with the concentration of 5-100 vt%2The pressure is 0.052-1MPa, and the carbonization time is controlled to be 0.5-72h, so as to obtain the carbonized steel slag artificial porous aggregate.
Preferably, in the first step, the raw material of the steel slag block is steel slag which is a byproduct in the steel-making process.
Preferably, the steel slag scraps obtained in the step one are put into a mill and milled until the specific surface area is 260m2Per gram of steel slag powder.
Preferably, in the second step, 60 parts by mass of the steel slag powder, 10 parts by mass of the portland cement and 30 parts by mass of the fly ash are weighed and mixed.
Preferably, in the third step, the relative humidity of the environment is kept at 80%, the temperature is kept at 20 ℃, and the curing is carried out for 4 d.
Preferably, the fourth step is carried out by introducing CO with the concentration of 99.9 vt%2The pressure is 0.4MPa, and the carbonization time is controlled to be 8 h.
The carbonized steel slag artificial porous aggregate prepared by the method.
Has the advantages that: 1) the main raw materials used by the invention are steel slag, fly ash, carbon dioxide and the like, the steel slag is accumulated to waste land resources, and the fly ash is limited in application in building materials due to poor gelatinization, so that the fly ash cannot be effectively treated. The invention carries out resource utilization on solid waste which is difficult to digest in the traditional industry. The carbon dioxide is taken as greenhouse gas, is not easy to store after being trapped, or needs high cost for treatment, and the invention can seal the carbon dioxide in the steel slag to a certain extent and prevent the carbon dioxide from releasing in the air to increase the degree of greenhouse effect.
2) The invention belongs to porous aggregate, can effectively reduce the quality of concrete, can provide internal curing effect for the concrete after absorbing water, improves the later strength of the concrete, and reduces the early volume shrinkage of the concrete, and can be seen in figure 3. In addition, under the great trend of natural aggregate resource shortage, the carbonized steel slag artificial porous aggregate substitute can reduce the dependence on natural sandstone aggregate.
3) The steel slag aggregate has excellent water retention performance, has obvious effect of reducing self-shrinkage volume deformation in the early stage of concrete forming, prevents the concrete from cracking in the early stage, ensures that cement can continuously obtain water from the aggregate in the long-term hydration process, improves the strength of the concrete, and can reach 53.8MPa to the maximum extent, which is higher than the highest strength requirement of C30 which can be met by the prior art.
The invention uses carbonization technology to treat steel slag, and carbon dioxide and active substances in the steel slag, such as calcium oxide, calcium hydroxide, calcium silicate and other calcium-containing magnesium ores, are utilized to react, so that expansion components are consumed, and the high-strength carbonized steel slag aggregate is prepared. The carbonized steel slag aggregate can be used as a substitute material of natural aggregate to prepare concrete materials, not only can solve the problems of poor stability hidden danger and poor gelling property of steel slag, but also can provide internal curing and reduce the self-shrinkage of concrete. The preparation of the carbonized steel slag artificial aggregate can effectively relieve the pressure in the aggregate industry at present, promote the resource recycling and promote the development of green building materials.
Drawings
FIG. 1 is a flow chart of the preparation of the carbonized steel slag artificial porous aggregate of the present invention;
FIG. 2 is a graph showing the compressive strength of concrete in examples 1 to 3 and comparative example 3;
FIG. 3 is a schematic view showing the self-shrinkage deformation of the aggregates in examples 1 to 3 and comparative example 3;
FIG. 4 is a microscopic morphology of the steel carbide slag artificial porous aggregate in example 1;
FIG. 5 is a drawing showing a physical representation of the steel carbide slag artificial porous aggregate in example 1;
FIG. 6 is a shape chart of the autoclaved artificial porous aggregate of the steel carbide slag in example 1;
FIG. 7 is a shape diagram of an undecarbonised steel slag artificial porous aggregate of comparative example 1 after autoclaving.
Detailed Description
The invention is further described below with reference to the accompanying drawings and specific embodiments.
Example 1
A preparation method of the carbonized steel slag artificial porous aggregate is disclosed, and referring to figure 1, the method comprises the following steps: crushing the steel slag block, putting the obtained crushed steel slag block into a mill, and grinding the crushed steel slag block into a powder with a specific surface area of 200m2Weighing 60 parts by mass of steel slag powder, 10 parts by mass of portland cement and 30 parts by mass of fly ash, mixing, and adding water according to a mass water-cement ratio of 0.19 to form balls so as to obtain a ball-shaped steel slag aggregate; and then pre-curing the obtained spherical steel slag aggregate for 72 hours under the conditions that the relative humidity is 50% and the temperature is 30 ℃. After the maintenance is finished, the spherical steel slag aggregate with the carbonized pre-structure is put into a carbonization kettle, carbon dioxide with the concentration of 99.9vt percent is introduced, the spherical steel slag aggregate is carbonized for 8 hours under the pressure of 0.1MPa to obtain the carbonized steel slag artificial porous aggregate which is marked as S1, and the aggregate is used for forming concrete,obtaining the carbonized steel slag aggregate concrete. The microscopic morphology of the steel slag aggregate prepared in the embodiment is shown in fig. 4, the physical image is shown in fig. 5, the appearance of the aggregate obtained by autoclaving the steel slag aggregate S1 at the temperature of 216 ℃ and under the pressure of 2MPa is shown in fig. 6, and the carbonized steel slag aggregate is intact after autoclaving and is not broken.
Example 2
A preparation method of artificial porous aggregate of carbonized steel slag comprises the following steps: crushing the steel slag block, putting the obtained crushed steel slag into a mill, and grinding until the specific surface area is 260m2Per gram of steel slag powder; weighing 40 parts by mass of steel slag powder, 20 parts by mass of portland cement and 40 parts by mass of fly ash, mixing, adding water according to a mass water-cement ratio of 0.19, and balling to obtain a globular steel slag aggregate; and then pre-curing the obtained spherical steel slag aggregate for 48 hours under the conditions that the relative humidity is 50% and the temperature is 20 ℃. After the maintenance is finished, the spherical steel slag aggregate with the carbonized pre-structure is placed in a carbonization kettle, carbon dioxide with the concentration of 100vt percent is introduced, the spherical steel slag aggregate is carbonized for 72 hours under the pressure of 0.1MPa, the carbonized steel slag artificial porous aggregate is obtained and is marked as S3, and the aggregate is used for forming concrete, so that the carbonized steel slag aggregate concrete is obtained.
Example 3
A preparation method of artificial porous aggregate of carbonized steel slag comprises the following steps: crushing the steel slag block, putting the obtained crushed steel slag into a mill, and grinding until the specific surface area is 260m2Per gram of steel slag powder; weighing 40 parts by mass of steel slag powder, 10 parts by mass of portland cement and 50 parts by mass of fly ash, mixing, adding water according to a mass water-cement ratio of 0.19, and balling to obtain a globular steel slag aggregate; and then pre-curing the obtained spherical steel slag aggregate for 24 hours under the conditions that the relative humidity is 60 percent and the temperature is 20 ℃. And after the maintenance is finished, putting the spherical steel slag aggregate with the carbonized pre-structure into a carbonization kettle, introducing carbon dioxide with the concentration of 40 vt%, carbonizing for 4 hours under the pressure of 1MPa to obtain carbonized steel slag aggregate, recording as S6, and forming concrete by using the aggregate to obtain the carbonized steel slag aggregate concrete.
Example 4
A preparation method of artificial porous aggregate of carbonized steel slag comprises the following steps:
firstly, preparing steel slag powder: crushing the steel slag block, putting the obtained crushed steel slag into a mill, and grinding until the specific surface area is 100m2The steel slag powder is characterized by comprising steel slag blocks, wherein the steel slag blocks are prepared from steel slag which is a byproduct in the steel making process.
Step two, preparation of steel slag ball aggregate: weighing 30 parts by mass of steel slag powder and 5 parts by mass of portland cement, and adding water according to the water-cement ratio of 0.19 to form balls so as to obtain the spherical steel slag aggregate.
Step three, carbonizing the steel slag aggregate: putting the spherical steel slag aggregate into a carbonization kettle, and introducing CO with the concentration of 5 vt%2The pressure is 0.052MPa, and the carbonization time is controlled to be 72h, so as to obtain the carbonized steel slag artificial porous aggregate.
Example 5
A preparation method of artificial porous aggregate of carbonized steel slag comprises the following steps:
firstly, preparing steel slag powder: crushing the steel slag block, putting the obtained crushed steel slag into a mill, and grinding until the specific surface area is 280m2The steel slag powder is characterized by comprising steel slag powder per gram, wherein the steel slag block raw material is steel slag which is a byproduct in the steel making process.
Step two, preparation of steel slag ball aggregate: weighing 100 parts by mass of steel slag powder, 20 parts by mass of portland cement, 60 parts by mass of a mixture of brick powder and fly ash (the mass ratio of the brick powder to the fly ash is 1:1), and adding water according to the water-cement ratio of 0.19 to form balls so as to obtain the spherical steel slag aggregate.
Step three, aggregate pretreatment: and (5) pre-curing the spherical steel slag aggregate obtained in the step two, keeping the relative humidity of the environment at 98 percent and the temperature at 60 ℃, and curing for 7 d.
Step four, carbonizing the steel slag aggregate: putting the pre-cured spherical steel slag aggregate into a carbonization kettle, and introducing CO with the concentration of 100 vt%2The pressure is 1MPa, and the carbonization time is controlled to be 0.5h, so as to obtain the carbonized steel slag artificial porous aggregate.
Example 6
A preparation method of artificial porous aggregate of carbonized steel slag comprises the following steps:
firstly, preparing steel slag powder: crushing the steel slag block, putting the obtained crushed steel slag into a mill, and grinding until the specific surface area is 260m2The steel slag powder is characterized by comprising steel slag blocks, wherein the steel slag blocks are prepared from steel slag which is a byproduct in the steel making process.
Step two, preparation of steel slag ball aggregate: weighing 60 parts by mass of steel slag powder, 10 parts by mass of Portland cement and 30 parts by mass of fly ash, and adding water according to the water-cement ratio of 0.19 to form balls so as to obtain the spherical steel slag aggregate.
Step three, aggregate pretreatment: and (5) pre-curing the spherical steel slag aggregate obtained in the step two, keeping the relative humidity of the environment at 80%, keeping the temperature at 20 ℃, and curing for 4 d.
Step four, carbonizing the steel slag aggregate: putting the spherical steel slag aggregate after pre-curing into a carbonization kettle, and introducing CO with the concentration of 99.9 vt%2The pressure is 0.4MPa, and the carbonization time is controlled to be 8h, so as to obtain the carbonized steel slag artificial porous aggregate.
Comparative example 1
A preparation method of non-carbonized steel slag artificial porous aggregate comprises the following steps: crushing the steel slag block, putting the obtained crushed steel slag into a mill, and grinding until the specific surface area is 260m2Per gram of steel slag powder; weighing 40 parts by mass of steel slag powder, 20 parts by mass of cement and 40 parts by mass of fly ash, mixing, adding water according to a mass water-cement ratio of 0.19, and pelletizing to obtain a spherical steel slag aggregate; and then pre-curing the obtained spherical steel slag aggregate for 48 hours under the conditions that the relative humidity is 50% and the temperature is 20 ℃. The obtained non-carbonized steel slag artificial porous aggregate is marked as C1, the appearance of the aggregate obtained by autoclaving at the temperature of 216 ℃ and the pressure of 2MPa is shown in figure 7, the non-carbonized steel slag artificial porous aggregate is pulverized or broken, the breakage rate reaches 44 percent, and the comparison between the figure 6 and the figure 7 shows that the volume stability of the steel slag aggregate can be improved by using the carbonization process in the patent, so that the steel slag aggregate is safe to use.
Comparative example 2
A preparation method of nickel carbide slag aggregate comprises the following steps: grinding the nickel slag block to a specific surface area of 200m2The powder per gram comprises nickel slag powder in a mass ratio of: cement: brick powder 40: 20: 40, balling to obtain nickel slag balls; then curing for 72 hours under the conditions of 50 percent of relative humidity and 30 ℃. After the maintenance is finished, putting the nickel slag balls into a carbonization kettle, and introducing CO with the concentration of 100 vt%2Controlling the pressure in the kettle to be 0.2MPa, and carbonizing for 24 hours to obtain the nickel carbide slag aggregate which is recorded as C2.
Comparative example 3
A natural aggregate: the natural aggregate is limestone aggregate crushed to 9.5-19mm and is marked as NA. Natural aggregate is used to form concrete.
Referring to fig. 2, the compressive strength of the concrete prepared from the carbonized aggregates obtained in examples 1 to 3 of the present invention can meet the requirement of the C40 concrete, and can reach 53.8MPa at most. Referring to fig. 3, it can be seen that the carbonized steel slag aggregate can significantly reduce the early volume shrinkage of concrete relative to the natural aggregate.
The concrete compositions of examples 1 to 3 and comparative example 3 are shown in Table 1 below, wherein the aggregate prepared in examples 1 to 3 and comparative example 3 was used.
TABLE 1 Molding ratio of one cubic meter concrete (kg)
The crush indices in Table 2 were determined according to the method in GB/T14685-2011 "construction pebbles and macadam".
TABLE 2 crushing index (%)
Table 2 shows the crushing index of the aggregates in examples 1 to 3 and comparative examples 1 to 3, and it can be seen that the crushing value of the carbonized aggregates is reduced by 11.66% relative to the non-carbonized steel slag aggregates, and the aggregates of example 2 can be used as grade I aggregates according to the standard GB/T14685-2011.
TABLE 3 bulk density (kg/m) of the steel slag aggregates3)
Table 3 shows the densities of the aggregates measured in examples 1 to 3 and comparative example 1, from which it can be seen that the carbonized aggregates are more dense and that the bulk density of the aggregates is reduced with the introduction of fly ash.
Claims (6)
1. The preparation method of the carbonized steel slag artificial porous aggregate is characterized by comprising the following steps:
firstly, preparing steel slag powder: crushing the steel slag block, putting the obtained crushed steel slag into a mill, and grinding until the specific surface area is 100-280m2Per gram of steel slag powder;
step two, preparation of steel slag ball aggregate: weighing 60 parts by mass of steel slag powder, 10 parts by mass of portland cement and 30 parts by mass of fly ash, mixing, adding water according to the water-cement ratio of 0.19, and balling to obtain a globular steel slag aggregate;
step three, aggregate pretreatment: pre-curing the spherical steel slag aggregate obtained in the step two, maintaining the relative humidity of the environment at 40-98% and the temperature at 20-60 ℃, and curing for 1-7 d;
step four, carbonizing the steel slag aggregate: putting the pre-cured spherical steel slag aggregate into a carbonization kettle, and introducing CO with the concentration of 5-100 vt%2The pressure is 0.052-1MPa, and the carbonization time is controlled to be 0.5-72h, so as to obtain the carbonized steel slag artificial porous aggregate.
2. The method as claimed in claim 1, wherein the steel slag block is steel slag as a by-product of steel-making process.
3. The method for preparing the artificial porous aggregate from carbonized steel slag as claimed in claim 1, wherein the aggregate obtained in the first stepThe crushed steel slag is put into a mill until the specific surface area is 260m2Per gram of steel slag powder.
4. The method for preparing the carbonized steel slag artificial porous aggregate as claimed in claim 1, wherein the environmental relative humidity is maintained at 80% and the temperature is maintained at 20 ℃ in the third step for 4 days.
5. The method for preparing the carbonized steel slag artificial porous aggregate as claimed in claim 1, wherein the CO with the concentration of 99.9 vt.% is introduced into the fourth step2The pressure is 0.4MPa, and the carbonization time is controlled to be 8 h.
6. The carbonized steel slag artificial porous aggregate prepared by the method of any one of claims 1 to 5.
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| CN112266193A (en) * | 2020-10-15 | 2021-01-26 | 南京工业大学 | Artificial steel slag aggregate and preparation method and application thereof |
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| CN115448628B (en) * | 2022-09-23 | 2023-08-25 | 天津水泥工业设计研究院有限公司 | Carbonized porous steel slag aggregate and preparation method thereof |
| CN116253555B (en) * | 2023-05-11 | 2023-07-07 | 天津杰臻环保技术有限公司 | Industrial sludge-based full-solid waste water permeable brick and preparation method thereof |
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