CN115259784A - Method for preparing cement-based building material based on cooperation of steel slag vulcanization and carbonization - Google Patents
Method for preparing cement-based building material based on cooperation of steel slag vulcanization and carbonization Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—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
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00284—Materials permeable to liquids
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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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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Abstract
The invention provides a method for preparing a cement-based building material based on cooperation of steel slag vulcanization and carbonization, which comprises the following steps: wetting the steel slag aggregate, mixing the wet steel slag aggregate with silica fume, putting the mixture into a vulcanization carbonization device, introducing tail gas of a coal-fired power plant into the vulcanization carbonization device for hot braising, then injecting water into the vulcanization carbonization device to form a steel slag solution, introducing the tail gas of the coal-fired power plant below the liquid level of the steel slag aggregate solution, pressurizing, vulcanizing and carbonizing the steel slag aggregate. The method for preparing the cement-based building material based on the synergy of steel slag vulcanization and carbonization takes the steel slag as an adsorbent, and the building material capable of replacing low-grade cement is prepared by adsorbing carbon dioxide and sulfur dioxide in the tail gas of a coal-fired power plant for carbonization and vulcanization, so that the utilization rate of steel waste slag is realized, the economic value is improved, and the method has good market application prospect.
Description
Technical Field
The invention belongs to the field of solid waste resource utilization, and particularly relates to a method for preparing a cement-based building material based on steel slag vulcanization and carbonization synergy.
Background
According to the statistical data of the world iron and steel industry association, the yield of Chinese crude steel reaches 10.53 hundred million tons in 2020, and the yield is increased by 5.2 percent on year-on-year basis. However, the steel production process consumes a lot of resources and energy and also discharges a lot of pollutants, and in the waste discharge structure (solid waste, waste gas and waste water), air pollutants are discharged most and waste gas is discharged per ton of steel44.7 tons accounting for 88.2 percent of the total waste discharge. According to the statistical data of 2018, the SO of the Chinese iron and steel industry2And the discharge of fine particulate matter has reached 105 ten thousand tons and 273 ten thousand tons, which account for 6% and 19% of the total discharge in China, respectively. The steel slag is industrial waste with certain potential hydraulic activity generated in the steel-making process, and has large slag discharge amount but lower recycling rate all the time. The steel slag aggregate has the strength, abrasion value, density and other properties close to or better than those of natural stone, replaces natural sandstone with the steel slag aggregate as a raw material, can improve the resource utilization rate of solid wastes, and has better economic, social and environmental benefits.
The steel slag has a large surface area and a large number of micro-mesoporous structures, is in a porous cellular structure and a multi-gap structure under a microscope, has a certain adsorption effect, belongs to an alkaline material, and can be applied to a wet dust removal-vulcanization carbonization process as an adsorbent, so that the steel slag with different particle sizes is adopted to carry out wet dust removal-vulcanization carbonization on the tail gas of a coal-fired power plant of a steel plant, and the obtained vulcanized carbonized steel slag is used as a raw material to produce the water permeable brick, so that the harm of the steel slag of the steel plant and the tail gas of the coal-fired power plant to the environment can be reduced, the production cost of the water permeable brick can be saved, and dual benefits of environmental protection and economy can be brought.
To sum up, aiming at a large amount of steel slag generated in the steel industry and tail gas of a coal-fired power plant at present, a vulcanized carbonized steel slag which can consume a large amount of industrial waste slag and reduce the emission of industrial waste gas is required to be developed, the vulcanized carbonized steel slag which meets the national standard < < GB/T20491-2017 > and is used for steel slag powder in cement and concrete is prepared at the same time, the vulcanized carbonized steel slag can be used for replacing cement-based building materials with low grade, and a high-performance water permeable brick which meets the requirement of a sponge urban water permeable pavement is prepared on the basis of the vulcanized carbonized steel slag, so that the resource utilization of the steel industry waste slag and the tail gas of coal-fired power generation is promoted, the urban water circulation is improved, the urban waterlogging risk is reduced as far as possible, and the practical significance is realized on the purposes of circular economy and 'double carbon'.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for synergistically preparing a cement-based building material based on steel slag vulcanization and carbonization, so as to provide a method for removing fine particles in tail gas of a coal-fired power plant of an iron and steel plant by a wet method and cooperatively preparing vulcanized and carbonized steel slag as a low-grade cement substitute by using steel slag of the iron and steel plant as an adsorbent.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for preparing a cement-based building material based on synergy of steel slag vulcanization and carbonization comprises the following steps:
wetting steel slag aggregate, mixing the wet steel slag aggregate with silica fume, putting the mixture into a vulcanization carbonization device, introducing tail gas of a coal-fired power plant into the vulcanization carbonization device for hot braising, then injecting water into the vulcanization carbonization device to form a steel slag aggregate solution, injecting the tail gas of the coal-fired power plant below the liquid level of the steel slag aggregate solution, pressurizing, vulcanizing and carbonizing steel slag.
The vulcanizing carbonization device used in the invention comprises a container, wherein a stirrer is arranged in the container and can stir steel slag aggregate in the container, a pressurizing and heating device is arranged in the container, on the side wall of the container or outside the container and is used for pressurizing and heating the container, the pressurizing and heating device is used for maintaining the temperature and the pressure required in the vulcanizing carbonization process, a discharge port is arranged at the bottom of the container, a charging port is arranged at the top of the container, and sealing devices are also arranged at the discharge port and the charging port of the container, so that the inside of the container can be ensured to be in a sealed state and keep a certain pressure. The charging opening of the container is also communicated with a tail gas absorption device for capturing the unreacted nitrogen oxide gas.
Further, the solid-to-liquid ratio of the wetted steel slag aggregate is 7-9; preferably, when the particle size of the steel slag aggregate is 0.15mm-50mm, the solid-to-liquid ratio is 7; when the particle size of the steel slag aggregate is less than 0.15mm, the solid-to-liquid ratio is 9.
Furthermore, the adding amount of the silica fume is 0 to 4 percent of the steel slag aggregate; preferably, the silica fume is added in an amount of 0 to 1.5% of the steel slag aggregate when the steel slag aggregate has a particle size of 0.15mm to 50mm, and in an amount of 0 to 4% of the steel slag aggregate when the steel slag aggregate has a particle size of less than 0.15 mm.
Further, the time of thermal stewing is 0-1h; preferably, the hot-braising time is 01-h when the grain size of the steel slag aggregate is 0.15-50 mm, and the hot-braising time is 0-0.5h when the grain size of the steel slag aggregate is less than 0.15 mm.
Further, the vulcanization carbonization temperature is 50-100 ℃, and the pressurization vulcanization carbonization time is less than 1h; preferably, when the grain size of the steel slag aggregate is 0.15mm-50mm, the vulcanization carbonization temperature is 50-100 ℃, and the pressurization vulcanization carbonization time is less than 1h; when the grain size of the steel slag aggregate is less than 0.15mm, the vulcanization carbonization temperature is 50-80 ℃, and the pressurization vulcanization carbonization time is less than 0.5h.
Further, stirring the steel slag aggregate solution in the vulcanization carbonization process, wherein the stirring speed is 1-8rpm; preferably, the stirring speed is 1-8rpm when the particle size of the steel slag aggregate is 0.15mm-50mm, and the stirring speed is 1-3rpm when the particle size of the steel slag aggregate is less than 0.15 mm.
The invention also aims to provide the water permeable brick, so that the steel slag subjected to vulcanization and carbonization is recycled to prepare the water permeable brick meeting the industrial standard, the resource utilization of the steel industry waste slag and the coal-fired power generation tail gas is promoted, the urban water circulation is improved, the urban waterlogging risk is reduced as far as possible, and the water permeable brick has important practical significance for realizing the aims of circular economy and double carbon.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the permeable brick comprises a steel slag crude vulcanized and carbonized steel slag aggregate and a steel slag fine vulcanized and carbonized aggregate, wherein the steel slag crude vulcanized and carbonized aggregate is prepared by the method for preparing the cement-based building material based on the cooperation of steel slag vulcanization and carbonization, the grain size of the steel slag crude aggregate is 0.15mm-50mm, and the steel slag fine vulcanized and carbonized aggregate is prepared by the method for preparing the cement-based building material based on the cooperation of steel slag vulcanization and carbonization.
Further, the free calcium oxide of the vulcanized carbonized steel slag fine aggregate is less than 0.1 percent, and the activity index 7d is more than 75; the free calcium oxide of the coarse aggregate of the vulcanized carbonized steel slag is less than 0.3 percent, and the activity index 7d is more than 70.
Further, the mass ratio of the vulcanized carbonized steel slag coarse aggregate to the vulcanized carbonized steel slag fine aggregate is 0.6-1.5.
Furthermore, the water permeable brick also comprises P.O 42.5 grade cement, silica fume, a water reducing agent and the like, wherein the bone cement ratio of the water permeable brick is about 7:1, water-to-glue ratio of about 0.3.
Compared with the prior art, the method for preparing the cement-based building material based on the cooperation of steel slag vulcanization and carbonization has the following advantages:
(1) The method for preparing the cement-based building material based on the cooperation of steel slag vulcanization and carbonization, disclosed by the invention, takes the steel slag as an adsorbent, and performs carbonization and vulcanization by adsorbing carbon dioxide and sulfur dioxide in the tail gas of a coal-fired power plant to prepare the building material capable of replacing low-grade cement, so that the utilization rate of the steel slag is realized, the economic value is improved, and the method has a good market application prospect.
(2) The method for preparing the cement-based building material based on the cooperation of the steel slag vulcanization and carbonization, disclosed by the invention, prepares the steel slag with different particle sizes into the aggregate, and the water permeable brick prepared by mixing the aggregate with other raw materials according to a certain proportion meets the national standard, has good water permeability and physical properties, and meets the requirements of building engineering.
Detailed Description
Unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are all conventional methods unless otherwise specified.
The present invention will be described in detail with reference to examples.
Example 1
In this embodiment, the method for preparing the cement-based building material based on the cooperation of steel slag vulcanization and carbonization comprises the following steps: the steel slag with the grain size of 0.15mm-50mm is used as a coarse aggregate, the steel slag with the grain size of less than 0.15mm is used as a fine aggregate, the coarse aggregate is wetted according to a solid-liquid ratio of 7:1, adding silica fume, wherein the adding amount of the silica fume in the coarse aggregate is 1.5 percent of that of the coarse aggregate, and the adding amount of the silica fume in the fine aggregate is 4 percent of that of the fine aggregate, then respectively putting the mixed coarse aggregate and fine aggregate into two vulcanization carbonization devices, and respectively introducing the mixed coarse aggregate and fine aggregate into the tail gas of a coal-fired power plant at 350 ℃ (the content of the mixed materials is 10 percent by volume)2、20％CO2、5％SO2And 65% of N2) Sealing a vulcanization carbonization device for heat braising, wherein the heat braising time of coarse aggregate is 1h, the heat braising time of fine aggregate is 0.5h, after the heat braising is finished, decompressing and exhausting the vulcanization carbonization device, injecting water to form a steel slag solution, then continuously introducing tail gas of a coal-fired power plant below the liquid level of the steel slag solution, maintaining the temperature of the steel slag solution of the coarse aggregate at 50-100 ℃ for 1h, maintaining the temperature of the steel slag solution of the fine aggregate at 50-80 ℃ for 0.5h, and performing pressurization vulcanization carbonization to respectively obtain the cement-based building material: stirring the steel slag solution in the pressurizing, vulcanizing and carbonizing process of the vulcanized and carbonized steel slag coarse aggregate and the vulcanized and carbonized steel slag fine aggregate, wherein the stirring speed of the coarse aggregate steel slag solution is 5rpm, and the stirring speed of the fine aggregate steel slag solution is 3rpm;
mixing the vulcanized carbonized steel slag coarse aggregate and the vulcanized carbonized steel slag fine aggregate according to the weight ratio of 1.5:1, mixing the mixture with P.O 42.5 grade cement, silica fume, a water reducing agent and the like, and pressing the mixture into the water permeable brick, wherein the bone cement ratio is about 7, and the water cement ratio is about 0.3.
The preparation of the permeable brick adopts a method of manual vibration and mechanical static pressure forming, wherein the mechanical static pressure time is 120s, the static pressure is 15MPa, and a formed test piece is placed in a curing pool and cured to the age of 28 d. The test of the compressive strength and the bending strength of the test piece is carried out according to the standard requirements of GB/T50081-2016 standard for testing the mechanical property of common concrete and GB/T25993-2010 pavement bricks and panels permeable to water, and the test of the coefficient of permeability is carried out according to the standard requirements of GB/T25993-2010 pavement bricks and panels permeable to water, which is the same as the above and is not repeated.
In the preparation of the vulcanized carbonized steel slag fine aggregate prepared by the embodiment, the activity index 7d is less than 0.1% and greater than 75, and the activity index 7d is less than 0.3% and greater than 70; the compression strength of the water permeable brick is 31.1MPa, the breaking strength is 3.05MPa, and the water permeability coefficient is 3.71mm/s.
Example 2
In this embodiment, the method for preparing the cement-based building material based on the cooperation of steel slag vulcanization and carbonization comprises the following steps: taking steel slag with the particle size of 0.15-50 mm as a coarse aggregate, taking steel slag with the particle size of less than 0.15mm as a fine aggregate, and moistening the coarse aggregate according to a solid-to-liquid ratio of 7Wet fine aggregate is mixed according to the solid-liquid ratio of 9:1, adding silica fume, wherein the adding amount of the silica fume in the coarse aggregate is 1.5 percent of that of the coarse aggregate, and the adding amount of the silica fume in the fine aggregate is 4 percent of that of the fine aggregate, then respectively putting the mixed coarse aggregate and fine aggregate into two vulcanization carbonization devices, and respectively introducing the mixed coarse aggregate and fine aggregate into the tail gas of a coal-fired power plant at 350 ℃ (the content of the mixed materials is 10 percent by volume)2、20％CO2、5％SO2And 65% of N2) Obtaining a vulcanized carbonized steel slag coarse aggregate and a vulcanized carbonized steel slag fine aggregate through hot braising, pressure reduction and air exhaust, water injection of a steel slag solution and pressurization, vulcanization and carbonization; mixing the vulcanized carbonized steel slag coarse aggregate and the vulcanized carbonized steel slag fine aggregate according to the proportion of 1.
The preparation of the water permeable brick adopts a method of manual vibration and mechanical static pressure forming, wherein the mechanical static pressure time is 120s, the static pressure is 15MPa, and the formed test piece is placed in a curing pool and cured to the age of 28 d.
In the preparation of the vulcanized carbonized steel slag fine aggregate, the activity index 7d of the free calcium oxide is less than 0.1% and is more than 75, and the activity index 7d of the free calcium oxide is less than 0.3% and is more than 70; the compression strength of the water permeable brick is 35.6MPa, the breaking strength is 5.81MPa, and the water permeability coefficient is 2.57mm/s.
Example 3
In this embodiment, the method for preparing the cement-based building material based on the cooperation of steel slag vulcanization and carbonization comprises the following steps: the steel slag with the grain size of 0.15mm-50mm is used as a coarse aggregate, the steel slag with the grain size of less than 0.15mm is used as a fine aggregate, the coarse aggregate is wetted according to a solid-liquid ratio of 7:1, adding silica fume in an amount of 1.5% of the coarse aggregate and 4% of the fine aggregate, and then charging the mixed coarse and fine aggregates into two carbonization units and introducing into the exhaust gas of a coal-fired power plant at 350 ℃ (the exhaust gas contains 10% by volume of O2、20％CO2、5％SO2And 65% of N2) Through hot braising, decompression exhausting, water injection of steel slag solution and pressurized carbon sulfideA curing process is carried out to obtain a vulcanized carbonized steel slag coarse aggregate and a vulcanized carbonized steel slag fine aggregate; mixing the coarse aggregate of the vulcanized carbonized steel slag and the fine aggregate of the vulcanized carbonized steel slag according to the proportion of 0.6 to 1, mixing the mixture with P.O 42.5 grade cement, silica fume, a water reducing agent and the like, and pressing the mixture into the water permeable brick after stirring, wherein the bone cement ratio is about 7, and the water cement ratio is about 0.3.
The preparation of the water permeable brick adopts a method of manual vibration and mechanical static pressure forming, wherein the mechanical static pressure time is 120s, the static pressure is 15MPa, and the formed test piece is placed in a curing pool and cured to the age of 28 d.
In the preparation of the vulcanized carbonized steel slag fine aggregate, the activity index 7d of the free calcium oxide is less than 0.1% and is more than 75, and the activity index 7d of the free calcium oxide is less than 0.3% and is more than 70; the compression strength of the permeable brick is 42.1MPa, the breaking strength is 4.57MPa, and the permeability coefficient is 0.71mm/s.
Comparative example 1
The difference from example 2 is: taking a heat-removing stewing link.
The steel slag with the grain size of 0.15mm-50mm is used as a coarse aggregate, the steel slag with the grain size of less than 0.15mm is used as a fine aggregate, the coarse aggregate is wetted according to a solid-liquid ratio of 7:1, adding silica fume, wherein the adding amount of the silica fume in the coarse aggregate is 1.5 percent of that of the coarse aggregate, and the adding amount of the silica fume in the fine aggregate is 4 percent of that of the fine aggregate, then respectively putting the mixed coarse aggregate and fine aggregate into two vulcanization carbonization devices, and respectively introducing the mixed coarse aggregate and fine aggregate into the tail gas of a coal-fired power plant at 350 ℃ (the content of the mixed materials is 10 percent by volume)2、20％CO2、5％SO2And 65% of N2) Synchronously injecting water to form a steel slag solution, and then starting a pressurizing, vulcanizing and carbonizing process, namely, decompressing and exhausting to obtain vulcanized carbonized steel slag coarse aggregate and vulcanized carbonized steel slag fine aggregate; mixing the vulcanized carbonized steel slag coarse aggregate and the vulcanized carbonized steel slag fine aggregate according to the proportion of 1, mixing the mixture with P.O 42.5 grade cement, silica fume, a water reducing agent and the like, and pressing the mixture into the water permeable brick after stirring, wherein the bone cement ratio is about 7, and the water cement ratio is about 0.3.
The activity index 7d of 0.17% of free calcium oxide in the fine aggregate of the vulcanized carbonized steel slag prepared by the comparative example is more than 65, and the activity index 7d of 1.81% of free calcium oxide in the coarse aggregate of the vulcanized carbonized steel slag is more than 61; the compression strength of the water permeable brick is 28.72MPa, the breaking strength is 3.47MPa, and the water permeability coefficient is 2.81mm/s.
Comparative example 2
The difference from example 2 is: SO is not contained in tail gas distribution of laboratory simulation coal-fired power plant2(volume fraction of 10% o2、20％CO2And 70% of N2)
The steel slag with the grain size of 0.15mm-50mm is used as a coarse aggregate, the steel slag with the grain size of less than 0.15mm is used as a fine aggregate, the coarse aggregate is wetted according to a solid-liquid ratio of 7:1, wetting, then doping silica fume, wherein the addition amount of the silica fume in the coarse aggregate is 1.5% of that of the coarse aggregate, and the addition amount of the silica fume in the fine aggregate is 4% of that of the fine aggregate, then respectively putting the mixed coarse aggregate and fine aggregate into two vulcanization carbonization devices, respectively introducing the tail gas of a coal-fired power plant at 350 ℃, and obtaining carbonized steel slag coarse aggregate and fine aggregate through the processes of hot braising, pressure reduction exhaust, water injection of steel slag solution and carbonization; mixing the carbonized steel slag coarse aggregate and the fine aggregate according to the proportion of 1.
The free calcium oxide with the activity index of 0.33 percent and the activity index of 7d of more than 65 in the fine aggregate of the carbonized steel slag and the free calcium oxide with the activity index of 2.79 percent and the activity index of 7d of more than 61 in the coarse aggregate of the carbonized steel slag prepared by the comparative example; the compression strength of the water permeable brick is 25.17MPa, the breaking strength is 2.39MPa, and the water permeability coefficient is 2.52mm/s.
Comparative example 3
The difference from example 2 is: the tail gas of the laboratory simulation coal-fired power plant does not contain CO in the gas distribution2(volume fraction of 10% o2、5％SO2And 85% of N2)
The method comprises the following steps of (1) wetting steel slag with the particle size of 0.15-50 mm as a coarse aggregate and steel slag with the particle size of less than 0.15mm as a fine aggregate according to a solid-liquid ratio of 7:1, wetting, then doping silica fume, wherein the addition amount of the silica fume in the coarse aggregate is 1.5% of that of the coarse aggregate, and the addition amount of the silica fume in the fine aggregate is 4% of that of the fine aggregate, then respectively putting the mixed coarse aggregate and fine aggregate into two vulcanization carbonization devices, respectively introducing tail gas of a coal-fired power plant at 350 ℃, and obtaining the vulcanized steel slag coarse aggregate and the fine aggregate through the processes of hot braising, pressure reduction exhaust, water injection of steel slag solution and vulcanization; mixing the coarse aggregate and the fine aggregate of the vulcanized steel slag according to the proportion of 1.
The activity index 7d of the free calcium oxide of 1.67 percent in the fine aggregate of the vulcanized steel slag prepared by the comparative example is more than 55, and the activity index 7d of the free calcium oxide of 8.39 percent in the coarse aggregate of the vulcanized steel slag is more than 50; the compression strength of the water permeable brick is 16.4MPa, the breaking strength is 1.57MPa, and the water permeability coefficient is 3.93mm/s.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A method for preparing a cement-based building material based on the cooperation of steel slag vulcanization and carbonization is characterized by comprising the following steps:
wetting the steel slag aggregate, mixing the wet steel slag aggregate with silica fume, putting the mixture into a vulcanization carbonization device, introducing tail gas of a high-temperature coal-fired power plant into the vulcanization carbonization device for hot braising, then injecting water into the vulcanization carbonization device to form a steel slag aggregate solution, introducing the tail gas of the coal-fired power plant below the liquid level of the steel slag aggregate solution, pressurizing, vulcanizing and carbonizing the steel slag aggregate.
2. The method for synergistically preparing a cement-based building material based on steel slag vulcanization and carbonization as claimed in claim 1, wherein: the solid-to-liquid ratio of the wetted steel slag aggregate is 7-9; preferably, when the particle size of the steel slag aggregate is 0.15mm-50mm, the solid-to-liquid ratio is 7; when the particle size of the steel slag aggregate is less than 0.15mm, the solid-to-liquid ratio is 9.
3. The method for synergistically preparing a cement-based building material based on steel slag vulcanization and carbonization as claimed in claim 1, wherein: the addition amount of the silica fume is 0 to 4 percent of the steel slag aggregate; preferably, the silica fume is added in an amount of 0 to 1.5% of the steel slag aggregate when the steel slag aggregate has a particle size of 0.15mm to 50mm, and in an amount of 0 to 4% of the steel slag aggregate when the steel slag aggregate has a particle size of less than 0.15 mm.
4. The method for synergistically preparing a cement-based building material based on steel slag vulcanization and carbonization as claimed in claim 1, wherein: the time of thermal stewing is 0-1h; preferably, the hot-braising time is 01-h when the grain size of the steel slag aggregate is 0.15-50 mm, and the hot-braising time is 0-0.5h when the grain size of the steel slag aggregate is less than 0.15 mm.
5. The method for synergistically preparing a cement-based building material based on steel slag vulcanization and carbonization as claimed in claim 1, wherein: the vulcanization carbonization temperature is 50-100 ℃, and the pressurization vulcanization carbonization time is less than 1h; preferably, when the grain size of the steel slag aggregate is 0.15mm-50mm, the vulcanization carbonization temperature is 50-100 ℃, and the pressure vulcanization carbonization time is less than 1h, and when the grain size of the steel slag aggregate is less than 0.15mm, the vulcanization carbonization temperature is 50-80 ℃, and the pressure vulcanization carbonization time is less than 0.5h.
6. The method for synergistically preparing a cement-based building material based on steel slag vulcanization and carbonization as claimed in claim 1, wherein: stirring the steel slag aggregate solution in the vulcanization carbonization process, wherein the stirring speed is 1-8rpm; preferably, the stirring speed is 1-8rpm when the particle size of the steel slag aggregate is 0.15mm-50mm, and the stirring speed is 1-3rpm when the particle size of the steel slag aggregate is less than 0.15 mm.
7. A brick permeates water, its characterized in that: the steel slag coarse aggregate and the steel slag fine aggregate are contained, the steel slag coarse aggregate and the steel slag fine aggregate are vulcanized and carbonized, the steel slag coarse aggregate is prepared by the method of claim 1, the steel slag aggregate with the grain size of 0.15mm-50mm, and the steel slag fine aggregate is prepared by the method of claim 1.
8. The permeable brick of claim 7, wherein: the mass ratio of the vulcanized carbonized steel slag coarse aggregate to the vulcanized carbonized steel slag fine aggregate is 0.6-1.5.
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| CN116947371A (en) * | 2023-09-20 | 2023-10-27 | 唐山瑞坤环境检测服务有限公司 | Carbonized steel slag-based precoated sand water permeable brick and preparation method thereof |
| CN116947371B (en) * | 2023-09-20 | 2023-11-17 | 唐山瑞坤环境检测服务有限公司 | Carbonized steel slag-based precoated sand water permeable brick and preparation method thereof |
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