CN115259784B - 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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- CN115259784B CN115259784B CN202210749929.9A CN202210749929A CN115259784B CN 115259784 B CN115259784 B CN 115259784B CN 202210749929 A CN202210749929 A CN 202210749929A CN 115259784 B CN115259784 B CN 115259784B
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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 steel slag vulcanization carbonization, which comprises the following steps: after being wetted, the steel slag aggregate is mixed with silica fume and placed into a vulcanization carbonization device, tail gas of a coal-fired power plant is introduced into the vulcanization carbonization device for heat stewing, then the vulcanization carbonization device is injected with water to form steel slag solution, the tail gas of the coal-fired power plant is introduced below the liquid level of the steel slag aggregate solution and pressurized, and the steel slag aggregate is subjected to pressurization vulcanization carbonization. According to the method for preparing the cement-based building material based on the cooperation of steel slag vulcanization and carbonization, the steel slag is used as an adsorbent, and the carbon dioxide and sulfur dioxide in the tail gas of the coal-fired power plant are adsorbed for carbonization and vulcanization, so that the building material capable of replacing low-grade cement is prepared, the utilization rate of steel waste slag is realized, the economic value is improved, and the method has a 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 cooperation of steel slag vulcanization and carbonization.
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 in the same ratio. However, the steel production process consumes a great deal of resources and energy, and also emits a great deal of pollutants, and in a waste emission structure (solid waste, waste gas and waste water), the emission of air pollutants is the largest, and 44.7 tons of waste gas is emitted per ton of steel, accounting for 88.2 percent of the total waste emission. According to 2018 statistical data, the Chinese iron and steel industry SO 2 And the emission of fine particles reaches 105 ten thousand tons and 273 ten thousand tons, which respectively account for 6% and 19% of the total emission of China. Steel slag is an industrial waste with a certain potential hydraulic activity generated in the steelmaking process, and has large slag discharge amount but low recovery utilization rate all the time. The strength, abrasion value, density and other properties of the steel slag aggregate are close to or better than those of natural stone materials so as toThe steel slag aggregate replaces natural sand stone as a raw material, can improve the recycling utilization rate of solid wastes, and has better economic, social and environmental benefits.
The steel slag has a larger surface area and a large number of micro-mesopore structures, the steel slag has a porous honeycomb structure under a microscope, a multi-gap structure has a certain adsorption effect, and the steel slag belongs to an alkaline material, and can be applied to a wet dedusting-vulcanization carbonization process as an adsorbent, so that the invention uses steel slag with different particle diameters to carry out wet dedusting-vulcanization carbonization on tail gas of a coal-fired power plant in a steel plant, and the obtained vulcanized carbonized steel slag is used as a raw material to produce the water permeable brick, thereby not only reducing the harm of the steel slag in the steel plant and the tail gas of the coal-fired power plant to the environment, but also saving the production cost of the water permeable brick and bringing double benefits of environmental protection and economy.
In summary, aiming at a large amount of steel slag and coal-fired power plant tail gas generated in the current steel industry, a method for consuming a large amount of industrial waste slag and reducing the emission of industrial waste gas is required to be developed, and meanwhile, vulcanized carbonized steel slag meeting the national standard < < GB/T20491-2017 for steel slag powder in cement and concrete > can be used for replacing cement-based building materials of low-grade cement, and high-performance water permeable bricks meeting the requirements of sponge city water permeable pavement are prepared based on the vulcanized carbonized steel slag, so that the recycling utilization of the waste slag and coal-fired power generation tail gas in the steel industry is promoted, the urban water circulation is improved, the urban waterlogging risk is reduced as much as possible, and the method has important practical significance for realizing the aim of recycling economy and double carbon.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for preparing cement-based building materials based on the cooperation of steel slag vulcanization and carbonization, so as to provide a method for removing fine particles in tail gas of coal-fired power plants in steel plants by using steel slag in steel plants as an adsorbent and cooperatively preparing vulcanized carbonized steel slag as a low-grade cement substitute.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
a method for preparing cement-based building materials based on steel slag vulcanization carbonization comprises the following steps:
after being wetted, the steel slag aggregate is mixed with silica fume and placed into a vulcanization carbonization device, tail gas of a coal-fired power plant is introduced into the vulcanization carbonization device for heat stewing, then water is injected into the vulcanization carbonization device to form steel slag aggregate solution, the tail gas of the coal-fired power plant is injected below the liquid level of the steel slag aggregate solution and pressurized, and steel slag pressurized vulcanization carbonization is carried out.
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 used for pressurizing and heating the container, the pressurizing and heating device is used for maintaining the temperature and pressure required in the vulcanizing carbonization process, a discharge hole is arranged at the bottom of the container, a feed inlet is arranged at the top of the container, and sealing devices are arranged at the discharge hole and the feed inlet of the container, so that the container is in a sealing state and a certain pressure is maintained. The container charging port is also communicated with a tail gas absorbing device for capturing unreacted nitrogen oxide gas.
Further, the solid-to-liquid ratio of the wetted steel slag aggregate is 7-9:1-3; preferably, when the grain diameter of the steel slag aggregate is 0.15mm-50mm, the solid-liquid ratio is 7:3; when the grain diameter of the steel slag aggregate is smaller than 0.15mm, the solid-liquid ratio is 9:1.
Further, the addition amount of the silica fume is 0-4% of the steel slag aggregate; preferably, when the grain diameter of the steel slag aggregate is 0.15mm-50mm, the addition amount of the silica fume is 0-1.5% of the steel slag aggregate, and when the grain diameter of the steel slag aggregate is less than 0.15mm, the addition amount of the silica fume is 0-4% of the steel slag aggregate.
Further, the time of thermal stewing is 0-1h; preferably, when the grain size of the steel slag aggregate is 0.15mm-50mm, the time of heat stewing is 01-h, and when the grain size of the steel slag aggregate is less than 0.15mm, the time of heat stewing is 0-0.5h.
Further, the vulcanization carbonization temperature is 50-100 ℃, and the press vulcanization carbonization time is less than 1h; preferably, when the grain diameter of the steel slag aggregate is 0.15mm-50mm, the vulcanization carbonization temperature is 50-100 ℃, and the press vulcanization carbonization time is less than 1h; when the grain diameter of the steel slag aggregate is smaller than 0.15mm, the vulcanization carbonization temperature is 50-80 ℃, and the press vulcanization carbonization time is smaller 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 1-3rpm when the particle size of the steel slag aggregate is less than 0.15 mm.
The invention further aims to provide the water permeable brick, so that the vulcanized and carbonized steel slag is recycled to prepare the water permeable brick which meets the industry standard, the recycling utilization of waste slag and coal-fired power generation tail gas in the steel industry is promoted, the urban water circulation is improved, the urban waterlogging risk is reduced as much 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 above purpose, the technical scheme of the invention is realized as follows:
the permeable brick comprises vulcanized carbonized steel slag coarse aggregate and vulcanized carbonized steel slag fine aggregate, wherein the vulcanized carbonized steel slag coarse aggregate is prepared by adopting the method for preparing the cement-based building material based on the cooperation of steel slag vulcanization and carbonization, and the vulcanized carbonized steel slag fine aggregate is prepared by adopting the method for preparing the cement-based building material based on the cooperation of steel slag vulcanization and carbonization, and the steel slag aggregate with the grain size smaller than 0.15 mm.
Further, the free calcium oxide of the vulcanized carbonized steel slag fine aggregate is lower than 0.1 percent, and the activity index 7d is higher than 75; the free calcium oxide of the vulcanized carbonized steel slag coarse aggregate is lower than 0.3 percent, and the activity index 7d is higher than 70.
Further, the mass ratio of the vulcanized carbonized steel slag coarse aggregate to the vulcanized carbonized steel slag fine aggregate is 0.6-1.5:1.
Further, the water permeable brick further comprises P.O42.5 grade cement, silica fume, a water reducing agent and the like, and the bone cement ratio of the water permeable brick is about 7:1, the water-gel ratio is about 0.3:1.
Compared with the prior art, the method for preparing the cement-based building material based on the cooperation of steel slag vulcanization carbonization has the following advantages:
(1) According to the method for preparing the cement-based building material based on the cooperation of steel slag vulcanization and carbonization, the steel slag is used as an adsorbent, and the carbon dioxide and sulfur dioxide in the tail gas of the coal-fired power plant are adsorbed for carbonization and vulcanization, so that the building material capable of replacing low-grade cement is prepared, the utilization rate of steel waste slag is realized, the economic value is improved, and the method has a good market application prospect.
(2) According to the method for preparing the cement-based building material based on the cooperation of steel slag vulcanization and carbonization, steel slag with different particle sizes is made into aggregate, and the aggregate is mixed with other raw materials according to a certain proportion to prepare the water permeable brick which 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 meaning as commonly understood by one of ordinary skill in the art to which the present invention pertains. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are conventional methods unless otherwise specified.
The present invention will be described in detail with reference to examples.
Example 1
The method for preparing the cement-based building material based on the cooperation of steel slag vulcanization carbonization in the embodiment comprises the following steps: the steel slag with the grain diameter of 0.15-50 mm is coarse aggregate, the steel slag with the grain diameter of less than 0.15mm is fine aggregate, the coarse aggregate is wetted according to the solid-to-liquid ratio of 7:3, and the fine aggregate is wetted according to the solid-to-liquid ratio of 9:1, then adding silica fume, wherein the addition amount of the silica fume in the coarse aggregate is 1.5% of that of the coarse aggregate, the addition amount of the silica fume in the fine aggregate is 4% of that of the fine aggregate, then respectively placing the mixed coarse aggregate and fine aggregate into two vulcanization carbonization devices, and respectively introducing coal-fired power plant tail gas (containing 10% of O by volume fraction) at 350 DEG C 2 、20％CO 2 、5％SO 2 And 65% N 2 ) Sealing, vulcanizing and carbonizing the device for heat stewing, wherein the heat stewing time of the coarse aggregate is 1h, the heat stewing time of the fine aggregate is 0.5h, decompressing and exhausting the vulcanizing and carbonizing device after heat stewing, injecting water to form steel slag solution, continuously introducing tail gas of a coal-fired power plant below the liquid level of the steel slag solution, maintaining the temperature of the coarse aggregate steel slag solution at 50-100 ℃ for 1h, maintaining the temperature of the fine aggregate steel slag solution at 50-80 ℃ for 0.5h, pressurizing, vulcanizing and carbonizing to obtain cement-based building respectivelyBuilding materials: stirring the steel slag solution in the press vulcanization carbonization process, 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;
the method comprises the steps of (1.5) mixing vulcanized carbonized steel slag coarse aggregate and vulcanized carbonized steel slag fine aggregate: mixing the materials according to the proportion of 1, stirring the materials with P.O42.5 cement, silica fume, water reducing agent and the like, and pressing the materials 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 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 a formed test piece is placed in a curing pool to be cured for 28 days. The test piece compressive strength and flexural strength are tested according to GB/T50081-2016 standard of common concrete mechanical property test method and GB/T25993-2010 standard requirements of permeable pavement bricks and permeable pavement boards, and the permeability coefficient is tested according to GB/T25993-2010 standard requirements of permeable pavement bricks and permeable pavement boards, and the test is not repeated.
The free calcium oxide in the vulcanized carbonized steel slag fine aggregate prepared in the embodiment is lower than 0.1 percent, the activity index 7d is more than 75, and the free calcium oxide in the vulcanized carbonized steel slag coarse aggregate is lower than 0.3 percent, the activity index 7d is more than 70; the compressive strength of the water permeable brick is 31.1MPa, the flexural strength is 3.05MPa, and the water permeability coefficient is 3.71mm/s.
Example 2
The method for preparing the cement-based building material based on the cooperation of steel slag vulcanization carbonization in the embodiment comprises the following steps: the steel slag with the grain diameter of 0.15-50 mm is coarse aggregate, the steel slag with the grain diameter of less than 0.15mm is fine aggregate, the coarse aggregate is wetted according to the solid-to-liquid ratio of 7:3, and the fine aggregate is wetted according to the solid-to-liquid ratio of 9:1, then adding silica fume, wherein the addition amount of the silica fume in the coarse aggregate is 1.5% of that of the coarse aggregate, the addition amount of the silica fume in the fine aggregate is 4% of that of the fine aggregate, then respectively placing the mixed coarse aggregate and fine aggregate into two vulcanization carbonization devices, and respectively introducing coal-fired power plant tail gas (containing 10% of O by volume fraction) at 350 DEG C 2 、20％CO 2 、5％SO 2 And 65% N 2 ) Venting by heat-stewing-depressurizingInjecting steel slag solution, pressurizing, vulcanizing and carbonizing to obtain vulcanized carbonized steel slag coarse aggregate and vulcanized carbonized steel slag fine aggregate; mixing the vulcanized carbonized steel slag coarse aggregate with the vulcanized carbonized steel slag fine aggregate according to the proportion of 1:1, and mixing with P.O 42.5-grade cement, silica fume, a water reducing agent and the like, stirring, and pressing 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 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 a formed test piece is placed in a curing pool to be cured for 28 days.
The free calcium oxide in the vulcanized carbonized steel slag fine aggregate prepared in the embodiment is lower than 0.1 percent, the activity index 7d is more than 75, and the free calcium oxide in the vulcanized carbonized steel slag coarse aggregate is lower than 0.3 percent, the activity index 7d is more than 70; the compressive strength of the water permeable brick is 35.6MPa, the flexural strength is 5.81MPa, and the water permeability coefficient is 2.57mm/s.
Example 3
The method for preparing the cement-based building material based on the cooperation of steel slag vulcanization carbonization in the embodiment comprises the following steps: the steel slag with the grain diameter of 0.15-50 mm is coarse aggregate, the steel slag with the grain diameter of less than 0.15mm is fine aggregate, the coarse aggregate is wetted according to the solid-to-liquid ratio of 7:3, and the fine aggregate is wetted according to the solid-to-liquid ratio of 9:1, then adding silica fume, wherein the addition amount of the silica fume in the coarse aggregate is 1.5% of that of the coarse aggregate, the addition amount of the silica fume in the fine aggregate is 4% of that of the fine aggregate, then respectively placing the mixed coarse aggregate and fine aggregate into two vulcanization carbonization devices, and respectively introducing coal-fired power plant tail gas (containing 10% of O by volume fraction) at 350 DEG C 2 、20％CO 2 、5％SO 2 And 65% N 2 ) The method comprises the steps of obtaining vulcanized carbonized steel slag coarse aggregate and vulcanized carbonized steel slag fine aggregate through a thermal stewing, reduced pressure exhaust, water injection of steel slag solution and pressurized vulcanization carbonization process; mixing the vulcanized carbonized steel slag coarse aggregate with the vulcanized carbonized steel slag fine aggregate according to the proportion of 0.6:1, and mixing with P.O 42.5-grade cement, silica fume, a water reducing agent and the like, stirring, and pressing 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 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 a formed test piece is placed in a curing pool to be cured for 28 days.
The free calcium oxide in the vulcanized carbonized steel slag fine aggregate prepared in the embodiment is lower than 0.1 percent, the activity index 7d is more than 75, and the free calcium oxide in the vulcanized carbonized steel slag coarse aggregate is lower than 0.3 percent, the activity index 7d is more than 70; the compressive strength of the water permeable brick is 42.1MPa, the flexural strength is 4.57MPa, and the water permeability coefficient is 0.71mm/s.
Comparative example 1
Unlike example 2, the following is: and (5) eliminating a heat stewing link.
The steel slag with the grain diameter of 0.15-50 mm is coarse aggregate, the steel slag with the grain diameter of less than 0.15mm is fine aggregate, the coarse aggregate is wetted according to the solid-to-liquid ratio of 7:3, and the fine aggregate is wetted according to the solid-to-liquid ratio of 9:1, then adding silica fume, wherein the addition amount of the silica fume in the coarse aggregate is 1.5% of that of the coarse aggregate, the addition amount of the silica fume in the fine aggregate is 4% of that of the fine aggregate, then respectively placing the mixed coarse aggregate and fine aggregate into two vulcanization carbonization devices, and respectively introducing coal-fired power plant tail gas (containing 10% of O by volume fraction) at 350 DEG C 2 、20％CO 2 、5％SO 2 And 65% N 2 ) Synchronously injecting water to form a steel slag solution, and then starting a pressurizing, vulcanizing and carbonizing process, namely depressurizing 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 with the vulcanized carbonized steel slag fine aggregate according to a proportion of 1:1, and mixing with P.O42.5-grade cement, silica fume, a water reducing agent and the like, stirring, and pressing into the water permeable brick, wherein the bone cement ratio is about 7, and the water cement ratio is about 0.3.
The free calcium oxide in the vulcanized carbonized steel slag fine aggregate prepared in the comparative example has an activity index 7d of 0.17% which is more than 65, and the free calcium oxide in the vulcanized carbonized steel slag coarse aggregate has an activity index 7d of 1.81% which is more than 61; the compressive strength of the water permeable brick is 28.72MPa, the flexural strength is 3.47MPa, and the water permeability coefficient is 2.81mm/s.
Comparative example 2
Unlike example 2, the following is: SO-free tail gas distribution of laboratory simulated coal-fired power plant 2 (volume fraction 10% O) 2 、20％CO 2 And 70% N 2 )
The steel slag with the grain diameter of 0.15-50 mm is coarse aggregate, the steel slag with the grain diameter of less than 0.15mm is fine aggregate, the coarse aggregate is wetted according to the solid-to-liquid ratio of 7:3, and the fine aggregate is wetted according to the solid-to-liquid ratio of 9:1, wetting, adding silica fume, wherein the addition amount of the silica fume in the coarse aggregate is 1.5% of that of the coarse aggregate, the addition amount of the silica fume in the fine aggregate is 4% of that of the fine aggregate, respectively placing the mixed coarse aggregate and fine aggregate into two vulcanization carbonization devices, respectively introducing coal-fired power plant tail gas at 350 ℃, and obtaining carbonized steel slag coarse aggregate and fine aggregate through a heat stewing, decompression exhausting, water injection steel slag solution carbonization process; mixing the carbonized steel slag coarse aggregate with the fine aggregate according to the proportion of 1:1, and mixing with P.O42.5 grade cement, silica fume, a water reducing agent and the like, stirring, and pressing into the water permeable brick, wherein the bone cement ratio is about 7, and the water cement ratio is about 0.3.
The free calcium oxide in the carbonized steel slag fine aggregate prepared in the comparative example has an activity index 7d of 0.33% which is more than 65, and the free calcium oxide in the carbonized steel slag coarse aggregate has an activity index 7d of 2.79% which is more than 61; the compressive strength of the water permeable brick is 25.17MPa, the flexural strength is 2.39MPa, and the water permeability coefficient is 2.52mm/s.
Comparative example 3
Unlike example 2, the following is: laboratory simulation coal-fired power plant tail gas distribution does not contain CO 2 (volume fraction 10% O) 2 、5％SO 2 And 85% N 2 )
The steel slag with the grain diameter of 0.15-50 mm is coarse aggregate, the steel slag with the grain diameter of less than 0.15mm is fine aggregate, the coarse aggregate is wetted according to the solid-to-liquid ratio of 7:3, and the fine aggregate is wetted according to the solid-to-liquid ratio of 9:1, wetting, adding silica fume, wherein the addition amount of the silica fume in the coarse aggregate is 1.5% of that of the coarse aggregate, the addition amount of the silica fume in the fine aggregate is 4% of that of the fine aggregate, respectively placing the mixed coarse aggregate and fine aggregate into two vulcanization carbonization devices, respectively introducing coal-fired power plant tail gas at 350 ℃, and obtaining vulcanized steel slag coarse aggregate and fine aggregate through a thermal stewing-decompression exhausting-water injection steel slag solution-vulcanization process; mixing the vulcanized steel slag coarse aggregate with the fine aggregate according to the proportion of 1:1, and mixing with P.O42.5 grade cement, silica fume, a water reducing agent and the like, stirring, and pressing into the water permeable brick, wherein the bone cement ratio is about 7, and the water cement ratio is about 0.3.
The free calcium oxide in the fine aggregate of the vulcanized steel slag prepared in the comparative example has an activity index 7d of 1.67% which is more than 55, and the free calcium oxide in the coarse aggregate of the vulcanized steel slag has an activity index 7d of 8.39% which is more than 50; the compressive strength of the water permeable brick is 16.4MPa, the flexural strength is 1.57MPa, and the water permeability coefficient is 3.93mm/s.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (8)
1. The method for preparing the cement-based building material based on the cooperation of steel slag vulcanization and carbonization is characterized by comprising the following steps of:
after the steel slag aggregate is moistened, the steel slag aggregate is mixed with silica fume and put into a vulcanization carbonization device, high-temperature coal-fired power plant tail gas is introduced into the vulcanization carbonization device for heat stewing, then the vulcanization carbonization device is injected with water to form steel slag aggregate solution, the coal-fired power plant tail gas is introduced below the liquid level of the steel slag aggregate solution and pressurized, and the coal-fired power plant tail gas contains 10% of O by volume percent 2 、20％CO 2 、5％SO 2 And 65% N 2， The steel slag aggregate is pressed, vulcanized and carbonized,
when the grain diameter of the steel slag aggregate is 0.15mm-50mm, the solid-liquid ratio of the wetted steel slag aggregate is 7:3; when the grain diameter of the steel slag aggregate is smaller than 0.15mm, the solid-to-liquid ratio of the wetted steel slag aggregate is 9:1,
when the grain diameter of the steel slag aggregate is 0.15mm-50mm, the vulcanization carbonization temperature is 50-100 ℃, the press vulcanization carbonization time is less than 1h, when the grain diameter of the steel slag aggregate is less than 0.15mm, the vulcanization carbonization temperature is 50-80 ℃, the press vulcanization carbonization time is less than 0.5h,
and stirring the steel slag aggregate solution in the vulcanization carbonization process, wherein the stirring speed is 1-8rpm.
2. The method for cooperatively preparing a cement-based building material based on steel slag vulcanization carbonization as set forth in claim 1, wherein: the addition amount of the silica fume is 0-4% of the steel slag aggregate.
3. The method for cooperatively preparing a cement-based building material based on steel slag vulcanization carbonization as claimed in claim 2, wherein the method comprises the following steps: when the grain diameter of the steel slag aggregate is 0.15mm-50mm, the addition amount of the silica fume is 0-1.5% of the steel slag aggregate, and when the grain diameter of the steel slag aggregate is less than 0.15mm, the addition amount of the silica fume is 0-4% of the steel slag aggregate.
4. The method for cooperatively preparing a cement-based building material based on steel slag vulcanization carbonization as set forth in claim 1, wherein: the time of thermal stewing is 0-1h.
5. The method for cooperatively preparing a cement-based building material based on steel slag vulcanization carbonization according to claim 4, wherein the method comprises the following steps: when the grain diameter of the steel slag aggregate is 0.15mm-50mm, the heat stewing time is 0-1h, and when the grain diameter of the steel slag aggregate is less than 0.15mm, the heat stewing time is 0-0.5h.
6. The method for cooperatively preparing a cement-based building material based on steel slag vulcanization carbonization as set forth in claim 1, wherein: stirring the steel slag aggregate solution in the vulcanization carbonization process, wherein the stirring speed is 1-8rpm when the grain diameter of the steel slag aggregate is 0.15-50 mm, and is 1-3rpm when the grain diameter of the steel slag aggregate is less than 0.15 mm.
7. The utility model provides a water permeable brick which characterized in that: the method comprises the steps of vulcanizing carbonized steel slag coarse aggregate and vulcanizing carbonized steel slag fine aggregate, wherein the vulcanizing carbonized steel slag coarse aggregate is steel slag aggregate with the grain size of 0.15-50 mm and is prepared by the method according to claim 1, and the vulcanizing carbonized steel slag fine aggregate is steel slag aggregate with the grain size of less than 0.15mm and is prepared by the method according to claim 1.
8. The water permeable brick according to claim 7, wherein: the mass ratio of the vulcanized carbonized steel slag coarse aggregate to the vulcanized carbonized steel slag fine aggregate is 0.6-1.5:1.
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| CN116854393B (en) * | 2023-09-04 | 2023-11-03 | 唐山瑞坤环境检测服务有限公司 | Carbonized steel slag broken stone stabilized by carbonized vulcanized steel slag-based cementing material and application |
| CN116854418B (en) * | 2023-09-04 | 2023-11-03 | 唐山瑞坤环境检测服务有限公司 | Carbon-trapping steel slag-based hot flue gas curing concrete and preparation method and application 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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