CN110950607B - High-strength baking-free ceramsite and preparation method and application thereof - Google Patents
High-strength baking-free ceramsite and preparation method and application thereof Download PDFInfo
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- CN110950607B CN110950607B CN201911312791.0A CN201911312791A CN110950607B CN 110950607 B CN110950607 B CN 110950607B CN 201911312791 A CN201911312791 A CN 201911312791A CN 110950607 B CN110950607 B CN 110950607B
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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
- 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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- 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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Abstract
The invention discloses a high-strength baking-free ceramsite and a preparation method and application thereof, wherein the preparation method comprises the steps of uniformly mixing blast furnace slag powder and steel slag powder which are respectively ground and dried with fly ash, portland cement and an activating agent to prepare a mixture, spraying a cellulose active aqueous solution for granulation to obtain a ceramsite green body, and curing to obtain the high-strength baking-free ceramsite; the apparent density and the cylinder compressive strength of the prepared high-strength baking-free ceramsite in an oven-dry state are respectively 900-1100kg/m3And 7-10 MPa. The preparation method provided by the invention has the advantages that most of raw materials are industrial solid wastes, so that resources can be effectively recycled, pollution is reduced, and the ecological environment is protected; sintering is not needed, the process is simple and controllable, the raw material price is low, and the energy consumption is low; the prepared ceramsite is green and environment-friendly, has small apparent density, high cylinder pressure strength and excellent comprehensive performance, can be widely applied to building materials and heat-insulating materials, and has wide practical application prospect.
Description
Technical Field
The invention relates to the technical field of recycling of solid wastes, in particular to high-strength baking-free ceramsite and a preparation method and application thereof.
Background
Blast furnace slag, steel slag and fly ash are common industrial solid wastes, and along with the rapid development of industry, the stockpiling amount of the industrial solid wastes is larger and larger, so that heavy environmental load is brought. Industrial solid waste is disposed in a landfill mode, and the same has larger environmental risk; the preparation of the building material by utilizing the industrial solid waste is an effective way for harmlessness and recycling. The ceramsite is one of the building materials with better economic value.
The raw materials for preparing the ceramsite are mainly natural raw materials in the initial research, and the main raw materials for preparing the ceramsite are industrial solid wastes through the continuous development of the preparation process. The ceramsite types are divided into three types, namely sintered ceramsite, sintered ceramsite and non-sintered ceramsite. The sintered ceramsite and the sintered and expanded ceramsite are prepared through a high-temperature process, a large amount of energy is consumed, and the preparation process of the non-sintered ceramsite avoids the high-temperature process and can be formed at a lower temperature.
According to research on the spot and documents, the raw materials for preparing the baking-free ceramsite mainly comprise polluted soil, incineration fly ash, sludge, fly ash and the like. The content of pollutants such as heavy metal, polycyclic aromatic hydrocarbon and the like in raw materials such as polluted soil, incineration fly ash, sludge and the like is high, and a ceramsite product prepared by the sintering-free preparation process has the risk of leaching in the use process and is not beneficial to environmental safety; the non-sintered ceramsite prepared from the fly ash, the steel slag, the slag and the like has better environmental safety. Meanwhile, through coupling of various solid wastes, the potential activity characteristics of the solid wastes are exerted, and the prepared non-sintered ceramsite has the advantages of good strength performance and higher economic value.
The present invention has been made in view of the above circumstances.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides high-strength baking-free ceramsite and a preparation method and application thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a process for preparing high-strength non-sintered haydite includes such steps as respectively grinding and drying blast furnace slag powder and steel slag powder, mixing with powdered coal ash, silicate cement and activating agent, spraying active aqueous solution of cellulose, granulating to obtain raw haydite, and curing.
In the technical scheme, the adding amounts of the blast furnace slag powder, the steel slag powder, the fly ash and the portland cement are respectively 30-40 parts, 15-25 parts, 30-40 parts and 10-20 parts by weight, and the adding amount of the activating agent is 1-5 wt% of the sum of the adding amounts of the blast furnace slag powder, the steel slag powder, the fly ash and the portland cement.
Specifically, in the above technical scheme, the specific surface area and the water content of the blast furnace slag powder are respectively 400-500m20-0.5% and/kg, and the amorphous content of the blast furnace slag powder is 95-100 wt%.
Specifically, in the above technical scheme, the specific surface area and the water content of the steel slag powder are respectively 400-500m2Kg and 0-0.5%.
Specifically, in the above technical solution, the specific surface area of the fly ash is 500-600m2Per kg, and the CaO content in the fly ash is 20-30 wt%.
Specifically, in the above technical scheme, the mixing amount of the admixture in the portland cement is 2-5 wt%.
Specifically, in the above technical scheme, the activating agent is triethanolamine and/or triisopropanolamine.
Further, in the above technical scheme, the mixing is dry ball milling, and the time for the dry ball milling is 10-20 min.
Still further, in the above technical solution, the cellulose active aqueous solution is prepared by dissolving water-soluble cellulose ether in magnetized water, and the concentration of the cellulose active aqueous solution is 10-20 wt%.
Still further, in the above technical scheme, the spraying amount of the cellulose active aqueous solution is 0.2-0.3 times of the mass of the mixture.
Preferably, in the above technical scheme, the particle size of the ceramsite green body is 5-10 mm.
Still further, in the above technical scheme, the temperature and relative humidity of the curing are 30-40 ℃ and 80-100%, respectively, and the curing time is 7-10 d.
Preferably, in the above technical scheme, the preparation method further comprises, before the curing, spraying an anti-sticking agent with a mass of 0.1-0.3 per mill of the ceramic green body on the surface of the ceramic green body and covering a plastic film.
The invention also provides the high-strength baking-free ceramsite prepared by the preparation method.
Specifically, the apparent density and the cylinder pressure strength of the high-strength baking-free ceramsite in an oven-dry state are respectively 900-1100kg/m3And 7-10 MPa.
The invention also provides application of the high-strength baking-free ceramsite in building materials and heat-insulating materials.
The invention has the advantages that:
(1) the preparation method of the high-strength baking-free ceramsite provided by the invention adopts most of raw materials as industrial solid wastes, so that the resources can be effectively recycled, the pollution is reduced, and the ecological environment is protected;
(2) the preparation method of the high-strength baking-free ceramsite provided by the invention does not need sintering, and has the advantages of simple and controllable process, low raw material price and low energy consumption;
(3) the high-strength baking-free ceramsite prepared by the method disclosed by the invention is green and environment-friendly, small in apparent density, high in cylinder compressive strength, excellent in comprehensive performance, capable of being widely applied to building materials and heat-insulating materials, and wide in practical application prospect.
Drawings
FIG. 1 is a schematic view of a process for preparing high-strength non-sintered ceramsite in the embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples.
The following examples are intended to illustrate the present invention, but not to limit the scope of the invention, which is defined by the claims.
Unless otherwise specified, the test reagents and materials used in the examples of the present invention are commercially available.
Unless otherwise specified, the technical means used in the examples of the present invention are conventional means well known to those skilled in the art.
Wherein the activating agent is one or a mixture of two of commercially available triethanolamine and triisopropanolamine products.
Example 1
The embodiment of the invention provides a preparation method of high-strength baking-free ceramsite, which comprises the following steps of:
(1) grinding: respectively grinding the two solid wastes of the blast furnace slag and the steel slag until the specific surface area is 400m2Per kg, obtaining ground slag powder and ground steel slag powder;
(2) and (3) drying: drying the ground slag powder and the ground steel slag powder obtained in the step (1), wherein the drying temperature is 105 ℃, and the water content of the ground slag powder and the ground steel slag powder is 0.1% after drying;
(3) mixing and ball milling: adding fly ash, Portland cement and an activating agent into the dried slag powder and steel slag powder obtained in the step (2), and performing ball milling for 10min to obtain a mixture; wherein, the mass content of the slag powder is 30 percent, the mass content of the steel slag powder is 25 percent, the mass content of the fly ash is 35 percent, the mass content of the portland cement is 10 percent, and the content of the activating agent is 1 percent of the total mass of the four raw materials; wherein the slag powder isThe amorphous content is 95 percent, and the specific surface area of the fly ash is 500m2Per kg, the CaO content in the fly ash is 20 percent, and the mixing amount of the mixed material in the portland cement is 2 percent;
(4) disc dry granulation: placing the mixture obtained in the step (3) in a disc granulator, and spraying a cellulose ether active aqueous solution for granulation; wherein the cellulose ether is water-soluble cellulose ether, the concentration of the cellulose ether aqueous solution is 10 percent, the used water is magnetized water, the spraying amount of the aqueous solution is 20 percent of the mass of the mixture, and a ceramsite green compact is obtained after granulation, and the particle size range of the ceramsite green compact is 5-10 mm;
(5) and (5) maintenance: putting the ceramsite green body obtained in the step (4) into a maintenance tank, spraying an anti-sticking agent on the surface of the ceramsite green body, wherein the spraying amount of the anti-sticking agent is 0.1 per mill of the mass of the ceramsite, then maintaining, wherein the maintenance temperature is 30 ℃, the relative humidity is 80%, the surface of the ceramsite green body is covered with a plastic film in the maintenance process, and the maintenance time is 10 days;
the detection shows that the apparent density of the prepared non-sintered ceramsite in an oven-dry state is 1010kg/m3The barrel pressure strength was 8.2 MPa.
Example 2
The embodiment of the invention provides a preparation method of high-strength baking-free ceramsite, which is similar to the embodiment 1 and specifically comprises the following steps:
(1) grinding: respectively grinding the two solid wastes of the blast furnace slag and the steel slag into fineness until the specific surface area is 500m2Per kg, obtaining ground slag powder and ground steel slag powder;
(2) and (3) drying: drying the ground slag powder and the ground steel slag powder obtained in the step (1), wherein the drying temperature is 110 ℃, and the water content of the ground slag powder and the ground steel slag powder is 0.5% after drying;
(3) mixing and ball milling: adding fly ash, Portland cement and an activating agent into the dried slag powder and steel slag powder obtained in the step (2), and carrying out ball milling for 16min to obtain a mixture; wherein, the mass content of the slag powder is 40 percent, the mass content of the steel slag powder is 20 percent, the mass content of the fly ash is 30 percent, the mass content of the portland cement is 10 percent, the content of the activating agent is 5 percent of the total mass of the four raw materials, and the amorphous content of the slag powder is 10 percent0 percent, and the specific surface area of the fly ash is 600m2Per kg, the CaO content in the fly ash is 30 percent, and the mixing amount of the mixed material in the portland cement is 5 percent;
(4) disc dry granulation: placing the mixture obtained in the step (3) in a disc granulator, and spraying a cellulose ether active aqueous solution for granulation; wherein the cellulose ether is water-soluble cellulose ether, the concentration of the cellulose ether aqueous solution is 20 percent, the used water is magnetized water, the spraying amount of the aqueous solution is 30 percent of the mass of the mixture, and a ceramsite green compact is obtained after granulation, and the particle size range of the ceramsite green compact is 5-10 mm;
(5) and (5) maintenance: putting the ceramsite green body obtained in the step (4) into a maintenance tank, spraying an anti-sticking agent on the surface of the ceramsite green body, wherein the spraying amount of the anti-sticking agent is 0.3 per mill of the mass of the ceramsite, then maintaining, wherein the maintenance temperature is 40 ℃, the relative humidity is 100%, and a plastic film is covered on the surface of the ceramsite green body in the maintenance process for 7 days;
the detection shows that the apparent density of the prepared non-sintered ceramsite in an oven-dry state is 930kg/m3The barrel pressure strength was 7.8 MPa.
Example 3
The embodiment of the invention provides a preparation method of high-strength baking-free ceramsite, which is similar to the embodiment 1 and specifically comprises the following steps:
(1) grinding: respectively grinding the two solid wastes of the blast furnace slag and the steel slag until the specific surface area is 450m2Per kg, obtaining ground slag powder and ground steel slag powder;
(2) and (3) drying: drying the ground slag powder and the ground steel slag powder obtained in the step (1), wherein the drying temperature is 105 ℃, and the water content of the ground slag powder and the ground steel slag powder is 0.3% after drying;
(3) mixing and ball milling: adding fly ash, Portland cement and an activating agent into the dried slag powder and steel slag powder obtained in the step (2), and carrying out ball milling for 15min to obtain a mixture; wherein the mass content of the slag powder is 30 percent, the mass content of the steel slag powder is 20 percent, the mass content of the fly ash is 35 percent, the mass content of the portland cement is 15 percent, the content of the activating agent is 3 percent of the total mass of the four raw materials, the amorphous content of the slag powder is 97 percent, and the ratio of the fly ashSurface area 550m2The CaO content in the fly ash is 23 percent, and the mixing amount of the mixed material in the portland cement is 3 percent;
(4) disc dry granulation: placing the mixture obtained in the step (3) in a disc granulator, and spraying a cellulose ether active aqueous solution for granulation, wherein the cellulose ether is water-soluble cellulose ether, the concentration of the cellulose ether aqueous solution is 15%, the used water is magnetized water, the spraying amount of the aqueous solution is 25% of the mass of the mixture, and a ceramsite green blank is obtained after granulation, and the particle size range of the ceramsite green blank is 5-10 mm;
(5) and (5) maintenance: putting the ceramsite green body obtained in the step (4) into a maintenance tank, spraying an anti-sticking agent on the surface of the ceramsite green body, wherein the spraying amount of the anti-sticking agent is 0.2 per mill of the mass of the ceramsite, and then maintaining, wherein the maintenance temperature is 35 ℃, the relative humidity is 90%, the surface of the ceramsite green body is covered with a plastic film in the maintenance process, and the maintenance time is 8 d;
the detection shows that the apparent density of the prepared non-sintered ceramsite in an oven-dry state is 990kg/m3The barrel pressure strength was 7.9 MPa.
Example 4
The embodiment of the invention provides a preparation method of high-strength baking-free ceramsite, which is similar to the embodiment 1 and specifically comprises the following steps:
(1) grinding: respectively grinding the two solid wastes of the blast furnace slag and the steel slag until the specific surface area is 400m2Per kg, obtaining ground slag powder and ground steel slag powder;
(2) and (3) drying: drying the ground slag powder and the ground steel slag powder obtained in the step (1), wherein the drying temperature is 105 ℃, and the water content of the ground slag powder and the ground steel slag powder is 0.2% after drying;
(3) mixing and ball milling: adding fly ash, Portland cement and an activating agent into the dried slag powder and steel slag powder obtained in the step (2), and performing ball milling for 10min to obtain a mixture; wherein, the mass content of the slag powder is 35 percent, the mass content of the steel slag powder is 15 percent, the mass content of the fly ash is 30 percent, the mass content of the portland cement is 20 percent, and the content of the activating agent is 2 percent of the total mass of the four raw materials. The amorphous content of the slag powder is 95 percent, and the specific surface area of the fly ash is 500m2Per kg, the CaO content in the fly ash is 20 percent. The mixing amount of the mixed material in the portland cement is 2 percent;
(4) disc dry granulation: placing the mixture obtained in the step (3) in a disc granulator, and spraying a cellulose ether active aqueous solution for granulation, wherein the cellulose ether is water-soluble cellulose ether, the concentration of the cellulose ether aqueous solution is 20%, the used water is magnetized water, the spraying amount of the aqueous solution is 30% of the mass of the mixture, and a ceramsite green blank is obtained after granulation, and the particle size range of the ceramsite green blank is 5-10 mm;
(5) and (5) maintenance: and (3) placing the ceramsite green body obtained in the step (4) into a maintenance tank, spraying an anti-sticking agent on the surface of the ceramsite green body, wherein the spraying amount of the anti-sticking agent is 0.3 per mill of the mass of the ceramsite, then maintaining, wherein the maintenance temperature is 40 ℃, the relative humidity is 100%, and a plastic film is covered on the surface of the ceramsite green body in the maintenance process for 9 days.
The detection shows that the apparent density of the prepared non-sintered ceramsite in an oven-dry state is 940kg/m3The barrel pressure strength was 8.8 MPa.
Example 5
The embodiment of the invention provides a preparation method of high-strength baking-free ceramsite, which is similar to the embodiment 1 and specifically comprises the following steps:
(1) grinding: respectively grinding the two solid wastes of the blast furnace slag and the steel slag to the fineness of 500m in specific surface area2Per kg, obtaining ground slag powder and ground steel slag powder;
(2) and (3) drying: drying the ground slag powder and the ground steel slag powder obtained in the step (1), wherein the drying temperature is 110 ℃, and the water content of the ground slag powder and the ground steel slag powder is 0.5% after drying;
(3) mixing and ball milling: adding fly ash, Portland cement and an activating agent into the dried slag powder and steel slag powder obtained in the step (2), and performing ball milling for 20min to obtain a mixture; wherein, the mass content of the slag powder is 35 percent, the mass content of the steel slag powder is 20 percent, the mass content of the fly ash is 30 percent, the mass content of the portland cement is 15 percent, and the content of the activating agent is 5 percent of the total mass of the four raw materials; the amorphous content of the slag powder is 100 percent, and the specific surface area of the fly ash is 600m2Per kg, powderThe CaO content in the coal ash is 30 percent. The mixing amount of the mixed material in the portland cement is 5 percent;
(4) disc dry granulation: placing the mixture obtained in the step (3) in a disc granulator, and spraying a cellulose ether active aqueous solution for granulation; wherein the cellulose ether is water-soluble cellulose ether, the concentration of the cellulose ether aqueous solution is 10 percent, the used water is magnetized water, the spraying amount of the aqueous solution is 20 percent of the mass of the mixture, and a ceramsite green compact is obtained after granulation, and the particle size range of the ceramsite green compact is 5-10 mm;
(5) and (5) maintenance: and (3) placing the ceramsite green body obtained in the step (4) into a maintenance tank, spraying an anti-sticking agent on the surface of the ceramsite green body, wherein the spraying amount of the anti-sticking agent is 0.1 per mill of the mass of the ceramsite, then maintaining, wherein the maintenance temperature is 30 ℃, the relative humidity is 85%, and the surface of the ceramsite green body is covered with a plastic film in the maintenance process for 10 days.
The detection shows that the apparent density of the prepared non-sintered ceramsite in an oven-dry state is 1080kg/m3The barrel pressure strength was 9.3 MPa.
Example 6
The embodiment of the invention provides a preparation method of high-strength baking-free ceramsite, which is similar to the embodiment 1 and specifically comprises the following steps:
(1) grinding: respectively grinding the two solid wastes of the blast furnace slag and the steel slag until the specific surface area is 450m2Per kg, obtaining ground slag powder and ground steel slag powder;
(2) and (3) drying: drying the ground slag powder and the ground steel slag powder obtained in the step (1), wherein the drying temperature is 105 ℃, and the water content of the ground slag powder and the ground steel slag powder is 0.3% after drying;
(3) mixing and ball milling: adding fly ash, Portland cement and an activating agent into the dried slag powder and steel slag powder obtained in the step (2), and carrying out ball milling for 15min to obtain a mixture; wherein, the mass content of the slag powder is 30 percent, the mass content of the steel slag powder is 25 percent, the mass content of the fly ash is 30 percent, the mass content of the portland cement is 15 percent, and the content of the activating agent is 3 percent of the total mass of the main raw materials in the step 4. The amorphous content of the slag powder is 98 percent, and the specific surface area of the fly ash is 580m2Per kg, CaO content in fly ash is 25 percent, and the mixing amount of the mixed material in the portland cement is 3 percent;
(4) disc dry granulation: placing the mixture obtained in the step (3) in a disc granulator, and spraying a cellulose ether active aqueous solution for granulation; wherein the cellulose ether is water-soluble cellulose ether, the concentration of the cellulose ether aqueous solution is 20 percent, the used water is magnetized water, and the spraying amount of the aqueous solution is 30 percent of the mass of the mixture. Granulating to obtain a ceramsite green body, wherein the particle size range of the ceramsite green body is 5-10 mm;
(5) and (5) maintenance: and (3) placing the ceramsite green body obtained in the step (4) into a maintenance tank, spraying an anti-sticking agent on the surface of the ceramsite green body, wherein the spraying amount of the anti-sticking agent is 0.3 per mill of the mass of the ceramsite, then maintaining, wherein the maintenance temperature is 40 ℃, the relative humidity is 100%, the surface of the ceramsite green body is covered with a plastic film in the maintenance process, and the maintenance time is 8 days.
The detection shows that the apparent density of the prepared non-sintered ceramsite in an oven-dry state is 960kg/m3The barrel pressure strength was 9.0 MPa.
Comparative example 1
The invention provides a preparation method of high-strength baking-free ceramsite, which is similar to the preparation method of the high-strength baking-free ceramsite in example 5 and specifically comprises the following steps:
(1) grinding: grinding the blast furnace slag to a fineness of 500m specific surface area2Per kg, obtaining ground slag powder;
(2) and (3) drying: drying the ground slag powder obtained in the step (1), wherein the drying temperature is 110 ℃, and the water content of the ground slag powder and the ground steel slag powder after drying is 0.5%;
(3) mixing and ball milling: adding fly ash, Portland cement and an activating agent into the slag powder dried in the step (2), and performing ball milling for 20min to obtain a mixture; wherein, the mass content of the slag powder is 35 percent, the mass content of the fly ash is 30 percent, the mass content of the portland cement is 15 percent, and the content of the activating agent is 5 percent of the total mass of the three raw materials; the amorphous content of the slag powder is 100 percent, and the specific surface area of the fly ash is 600m2Per kg, the CaO content in the fly ash is 30 percent. The mixing amount of the mixed material in the portland cement is 5 percent;
(4) disc dry granulation: placing the mixture obtained in the step (3) in a disc granulator, and spraying a cellulose ether active aqueous solution for granulation; wherein the cellulose ether is water-soluble cellulose ether, the concentration of the cellulose ether aqueous solution is 10 percent, the used water is magnetized water, the spraying amount of the aqueous solution is 20 percent of the mass of the mixture, and a ceramsite green compact is obtained after granulation, and the particle size range of the ceramsite green compact is 5-10 mm;
(5) and (5) maintenance: and (3) placing the ceramsite green body obtained in the step (4) into a maintenance tank, spraying an anti-sticking agent on the surface of the ceramsite green body, wherein the spraying amount of the anti-sticking agent is 0.1 per mill of the mass of the ceramsite, then maintaining, wherein the maintenance temperature is 30 ℃, the relative humidity is 85%, and the surface of the ceramsite green body is covered with a plastic film in the maintenance process for 10 days.
The detection shows that the apparent density of the prepared unfired ceramsite in an oven-dry state is 915kg/m3The barrel pressure strength was 5.8 MPa.
Comparative example 2
The invention provides a preparation method of high-strength baking-free ceramsite, which is similar to the preparation method of the high-strength baking-free ceramsite in example 1 and specifically comprises the following steps:
(1) grinding: respectively grinding the two solid wastes of the blast furnace slag and the steel slag until the specific surface area is 400m2Per kg, obtaining ground slag powder and ground steel slag powder;
(2) and (3) drying: drying the ground slag powder and the ground steel slag powder obtained in the step (1), wherein the drying temperature is 105 ℃, and the water content of the ground slag powder and the ground steel slag powder is 0.1% after drying;
(3) mixing and ball milling: adding fly ash, Portland cement and an activating agent into the dried slag powder and steel slag powder obtained in the step (2), and performing ball milling for 10min to obtain a mixture; wherein, the mass content of the slag powder is 25 percent, the mass content of the steel slag powder is 35 percent, the mass content of the fly ash is 30 percent, the mass content of the portland cement is 10 percent, and the content of the activating agent is 1 percent of the total mass of the four raw materials; wherein the amorphous content of the slag powder is 95 percent, and the specific surface area of the fly ash is 500m2Per kg, the CaO content in the fly ash is 20 percent, and the mixing amount of the mixed material in the portland cement is 2 percent;
(4) disc dry granulation: placing the mixture obtained in the step (3) in a disc granulator, and spraying a cellulose ether active aqueous solution for granulation; wherein the cellulose ether is water-soluble cellulose ether, the concentration of the cellulose ether aqueous solution is 10 percent, the used water is magnetized water, the spraying amount of the aqueous solution is 20 percent of the mass of the mixture, and a ceramsite green compact is obtained after granulation, and the particle size range of the ceramsite green compact is 5-10 mm;
(5) and (5) maintenance: putting the ceramsite green body obtained in the step (4) into a maintenance tank, spraying an anti-sticking agent on the surface of the ceramsite green body, wherein the spraying amount of the anti-sticking agent is 0.1 per mill of the mass of the ceramsite, then maintaining, wherein the maintenance temperature is 30 ℃, the relative humidity is 80%, the surface of the ceramsite green body is covered with a plastic film in the maintenance process, and the maintenance time is 10 days;
the detection shows that the apparent density of the prepared non-sintered ceramsite in an oven-dry state is 1040kg/m3The barrel pressure strength was 6.2 MPa.
Comparative example 3
The invention provides a preparation method of high-strength baking-free ceramsite, which is similar to the preparation method of the high-strength baking-free ceramsite in example 1 and specifically comprises the following steps:
(1) grinding: respectively grinding the two solid wastes of the blast furnace slag and the steel slag until the specific surface area is 400m2Per kg, obtaining ground slag powder and ground steel slag powder;
(2) and (3) drying: drying the ground slag powder and the ground steel slag powder obtained in the step (1), wherein the drying temperature is 105 ℃, and the water content of the ground slag powder and the ground steel slag powder is 0.1% after drying;
(3) mixing and ball milling: adding fly ash, Portland cement and an activating agent into the dried slag powder and steel slag powder obtained in the step (2), and performing ball milling for 10min to obtain a mixture; wherein, the mass content of the slag powder is 25 percent, the mass content of the steel slag powder is 35 percent, the mass content of the fly ash is 30 percent, the mass content of the portland cement is 10 percent, and the content of the activating agent is 1 percent of the total mass of the four raw materials; wherein the amorphous content of the slag powder is 95 percent, and the specific surface area of the fly ash is 500m2Per kg, the CaO content in the fly ash is 20 percent, and the mixing amount of the mixed material in the portland cement is 2 percent;
(4) disc dry granulation: placing the mixture obtained in the step (3) in a disc granulator, and spraying a cellulose ether active aqueous solution for granulation; wherein the cellulose ether is water-soluble cellulose ether, the concentration of the cellulose ether aqueous solution is 10 percent, the used water is magnetized water, the spraying amount of the aqueous solution is 20 percent of the mass of the mixture, and a ceramsite green compact is obtained after granulation, and the particle size range of the ceramsite green compact is 5-10 mm;
(5) and (5) maintenance: putting the ceramsite green body obtained in the step (4) into a maintenance tank, spraying an anti-sticking agent on the surface of the ceramsite green body, wherein the spraying amount of the anti-sticking agent is 0.1 per mill of the mass of the ceramsite, then maintaining, wherein the maintenance temperature is 25 ℃, the relative humidity is 60%, and a plastic film is covered on the surface of the ceramsite green body in the maintenance process for 10 days;
the detection shows that the apparent density of the prepared non-sintered ceramsite in an oven-dry state is 980kg/m3The barrel pressure strength was 6.4 MPa.
Finally, the above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A preparation method of high-strength baking-free ceramsite is characterized by comprising the steps of uniformly mixing the blast furnace slag powder and the steel slag powder which are respectively ground and dried with fly ash, Portland cement and an activating agent to prepare a mixture, spraying a cellulose active aqueous solution for granulation to obtain a ceramsite green body, and curing to obtain the high-strength baking-free ceramsite; the addition amounts of the blast furnace slag powder, the steel slag powder, the fly ash and the portland cement are respectively 30-40 parts, 15-25 parts, 30-40 parts and 10-20 parts by weight, and the addition amount of the activating agent is 1-5 wt% of the sum of the addition amounts of the blast furnace slag powder, the steel slag powder, the fly ash and the portland cement;
the specific surface area and the water content of the blast furnace slag powder are respectively 400-500m20-0.5% and/kg, and the amorphous content of the blast furnace slag powder is 95-100 wt%;
the specific surface area and the water content of the steel slag powder are respectively 400-500m2Kg and 0-0.5%;
the specific surface area of the fly ash is 500-600m2Per kg, and the CaO content in the fly ash is 20-30 wt%;
the mixing amount of the mixed material in the portland cement is 2-5 wt%;
the activating agent is triethanolamine and/or triisopropanolamine;
the temperature and the relative humidity of the maintenance are respectively 30-40 ℃ and 80-100%, and the maintenance time is 7-10 d.
2. The preparation method according to claim 1, wherein the mixing is dry ball milling, and the time of the dry ball milling is 10-20 min.
3. The production method according to claim 1 or 2,
the cellulose active aqueous solution is prepared by dissolving water-soluble cellulose ether in magnetized water, and the concentration of the cellulose active aqueous solution is 10-20 wt%;
and/or the spraying amount of the cellulose active aqueous solution is 0.2-0.3 time of the mass of the mixture.
4. The method according to claim 3, wherein the green ceramsite is 5-10mm in diameter.
5. The preparation method of claim 1, further comprising, before curing, spraying an anti-sticking agent with a mass of 0.1-0.3 ‰ of the ceramic green body on the surface of the ceramic green body and covering the surface with a plastic film.
6. The high-strength baking-free ceramsite prepared by the preparation method of any one of claims 1 to 5.
7. The high-strength unburned ceramsite according to claim 6, wherein the apparent density and the cylindrical compressive strength of said high-strength unburned ceramsite in an oven-dried state are respectively 900-1100kg/m3And 7-10 MPa.
8. The use of the high strength non-sintered ceramsite of claim 6 or 7 in building materials and thermal insulation materials.
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| CN112661430B (en) * | 2020-12-25 | 2023-02-07 | 建华建材（中国）有限公司 | Irregular light aggregate and concrete containing same |
| CN113045260B (en) * | 2021-02-20 | 2022-06-07 | 江苏金海宁新型建材科技有限公司 | High-strength heat-insulation ceramsite concrete and preparation and application thereof |
| CN114105536B (en) * | 2021-11-26 | 2022-09-13 | 建华建材（中国）有限公司 | Low-carbon environment-friendly non-sintered ceramsite filter material and preparation method and application thereof |
| CN114735995B (en) * | 2022-03-09 | 2023-02-03 | 首钢京唐钢铁联合有限责任公司 | Dephosphorization steel slag baking-free ceramsite and preparation method thereof |
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