CN111018384A - Hollow ceramsite and preparation method thereof - Google Patents
Hollow ceramsite and preparation method thereof Download PDFInfo
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- CN111018384A CN111018384A CN201911283048.7A CN201911283048A CN111018384A CN 111018384 A CN111018384 A CN 111018384A CN 201911283048 A CN201911283048 A CN 201911283048A CN 111018384 A CN111018384 A CN 111018384A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/027—Lightweight materials
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- 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
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- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention discloses a hollow ceramsite, which is a spherical core made of a substance which can be decomposed, burned or dissolved by heating, wherein the outer layer of the spherical core is coated with an inorganic material, the spherical core is removed by high-temperature sintering, and the inorganic material coated on the outer layer is sintered to form a shell with a hollow interior. Also discloses a preparation method thereof, which comprises the following steps: step 1: drying and crushing the inorganic material to prepare powder, or adding water into the obtained powder according to the mass percent of 20-50% to prepare slurry; step 2: coating the obtained powder or slurry on the surface of the spherical core to prepare a ceramsite blank; and step 3: drying and aging the obtained ceramsite blank in the shade, and then sintering at high temperature to obtain the hollow ceramsite. The hollow ceramsite prepared by the invention changes the porous structure in the existing ceramsite, is completely hollow, and after high-temperature sintering, the density is further reduced on the premise of ensuring high strength, thus being beneficial to being widely applied to the preparation of high-strength low-density concrete.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to hollow ceramsite and a preparation method thereof.
Background
The ceramsite is a light porous spherical or elliptical hard material. The composite material has the advantages of large specific surface area, large porosity, small stacking density, strong adsorption capacity, good heat and sound insulation effect, good frost resistance and durability and the like, and is widely applied to different fields of lightweight aggregate structural concrete, filtering materials for water treatment, backfill of construction mines and the like.
At present, common ceramsite in the market comprises ceramsite made of different materials such as clay ceramsite, shale ceramsite, fly ash ceramsite, coal gangue ceramsite, bottom mud ceramsite, sludge ceramsite, building waste ceramsite and the like, and also comprises non-sintered ceramsite prepared from a cementing material. The sintering method is the most common process for producing the ceramsite at present, and Na is passed through under the condition that the sintering temperature is slightly lower than the sintering temperature of the ceramsite in the sintering process2O、K2The main component SiO of the ceramics is formed under the action of fluxing agent oxides such as O, MgO, FeO and the like2、Al2O3And Fe2O3The liquid fused silicate compound is generated and has an internal oxidation reaction with gas generating substances such as organic matters, carbonates and the like in the raw materials to generate gas such as steam, oxygen, carbon dioxide, sulfur dioxide, carbon monoxide, nitrogen, hydrogen and the like, and the gas enables the ceramsite to form tiny closed pores in the firing process to expand the ceramsite. Researchers use solid wastes such as coal gangue or sludge as the raw materials for producing the ceramsite, and the ceramsite is lighter in weight because the solid wastes contain combustible components, but the limitations of the existing porous structure of the ceramsite cannot be broken through, the density cannot be very low, and the strength is greatly influenced. Due to the fact thatTherefore, how to further reduce the density of the ceramsite is a problem which is urgently needed to be solved in the production of the ceramsite on the basis of not influencing the strength of the ceramsite by changing the structure of the ceramsite.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and to provide at least the advantages described later.
The invention also aims to provide a hollow ceramsite, which is a spherical core made of materials which can be decomposed, combusted or dissolved by heating, wherein the outer layer of the spherical core is coated with inorganic materials, the spherical core is removed by high-temperature sintering, and the inorganic materials coated on the outer layer are sintered to form a shell with a hollow interior.
The invention also aims to provide a preparation method of the hollow ceramsite, which is characterized in that after the inorganic material is wrapped on the surface of the core which is easily decomposed by heating, the core structure is removed by high-temperature roasting, only the shell formed by the inorganic material is left, the method is simple and easy to operate, and the formed hollow ceramsite has the characteristics of low density, high strength and the like.
To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, there is provided a hollow ceramic granule having a spherical core made of a material decomposable, combustible or soluble by heat, the spherical core being coated with an inorganic material, and the spherical core being removed by high temperature sintering, and the inorganic material coated on the outer layer being sintered to form a hollow shell.
Preferably, the thermally decomposable, combustible or soluble substance comprises any of inorganic combustibles or organic combustibles.
Preferably, the spherical core is a sphere or an ellipsoid.
Preferably, the inorganic material is one or more of clay, pulverized coal, gangue powder, diatomite, shale powder, perlite tailing powder, steel slag, slag and metallurgical slag.
The invention also provides a preparation method of the hollow ceramsite, which comprises the following steps:
step 1: drying and crushing the inorganic material to prepare powder, or adding water into the obtained powder according to the mass percent of 20-50% to prepare slurry;
step 2: coating the obtained powder or slurry on the surface of a spherical core made of a substance which can be decomposed, combusted or dissolved by heating to prepare a ceramsite blank;
and step 3: and drying and aging the obtained ceramsite blank in the shade for 12-24h, and then placing the ceramsite blank in a muffle furnace for high-temperature roasting to obtain the hollow ceramsite.
Preferably, the inorganic material is dried in a drying oven at 80-150 ℃ for 1-2h, and then is subjected to ball milling and crushing, and the whole material passes through a 200-mesh sieve;
the inorganic material is clay, fly ash or coal gangue.
Preferably, the material of the spherical core in the step 1 is any one of carbon, agricultural solid waste, polypropylene pellets or polyethylene pellets, and the spherical core is a round ball with a diameter of 0.3-50mm and made of any one of the materials.
Preferably, the core is soaked in the slurry for 3-5s by adopting a slurry dipping method, and is taken out, and the slurry is naturally coated on the surface of the spherical core to prepare the ceramsite blank;
uniformly spraying the slurry on the surface of the core in a spraying manner to prepare the ceramsite blank; or
And adding the powder and the spherical core into a disc pelletizer simultaneously, spraying water while rolling, and coating the powder on the surface of the spherical core by adding water by a disc coating method to prepare the ceramsite blank.
Preferably, in the step 3, after the ceramsite blank dried and aged in the shade is placed in the muffle furnace, the temperature is raised to 700 ℃ at the speed of 5-10 ℃/min, and the temperature is kept for 15-30 min; heating to 950 ℃ and 1200 ℃ at the speed of 5-10 ℃/min, and preserving the heat for 15-30 min; naturally cooling to below 50 ℃ to obtain the hollow ceramsite;
the performance of the hollow ceramsite meets the use standard of the lightweight aggregate for concrete.
The invention at least comprises the following beneficial effects:
the invention adopts a spherical core made of materials (such as inorganic combustible materials or organic combustible materials) which can be decomposed, combusted or dissolved by heating, a coating layer made of inorganic materials is coated on the outer surface of the spherical core, then the spherical core is placed in a muffle furnace and is roasted at high temperature, the spherical core inside is decomposed into small molecules after being heated, because the coating shell formed by the inorganic materials such as clay, fly ash or coal gangue has a porous structure and is air-permeable, the gasified small molecules formed by high-temperature decomposition can overflow outside the coating shell and can be fully combusted into substances such as carbon dioxide, hydrogen, nitrogen and the like at high temperature in the muffle furnace, the spherical core inside is completely removed, only the coating shell outside is left, the coating shell outside is sintered at high temperature, and after cooling, the hollow ceramsite is prepared The characteristics of high strength and the like change the defects that the hollow ceramsite in the prior art is still in a porous structure and the density cannot be further reduced. In addition, the preparation method of the hollow ceramsite has the advantages of simple process and easy operation, can be widely used and prepared, and the prepared hollow ceramsite has high strength and low density, and can be used for preparing light high-strength concrete.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a flow chart of the preparation method of the hollow ceramsite of the invention;
FIG. 2 is a diagram showing the effect of the hollow ceramsite of the present invention.
Detailed Description
The present invention is described in further detail below to enable those skilled in the art to practice the invention with reference to the description.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
The invention provides a hollow ceramsite, which is a spherical core made of a material which can be decomposed, burned or dissolved by heating, wherein the outer layer of the spherical core is wrapped by an inorganic material, the spherical core is removed by high-temperature sintering, and the inorganic material wrapped by the outer layer is sintered to form a shell with a hollow interior.
In the scheme, the spherical core is made of a material which can be decomposed, burned or dissolved by heating, can be directly and completely decomposed after high temperature, overflows through the coating layer and then is further burned or decomposed in a muffle furnace to form carbon dioxide, nitrogen or hydrogen and other harmless substances, meanwhile, the spherical core is thoroughly removed, only the outer coating layer is left, and the coating layer is sintered at high temperature to form a shell with certain strength, so that the coating layer removed from the spherical core, namely the hollow ceramsite has the characteristics of light weight, low density and high strength, the defects that the density of the porous ceramsite cannot be further reduced and the high strength cannot be ensured in the prior art are overcome, and the hollow ceramsite is more favorably applied to preparation of light-weight high-strength concrete.
In a preferred embodiment, the substance decomposable, combustible or soluble by heating contains any one of inorganic combustible or organic combustible.
In the scheme, the density of the hollow ceramsite is further reduced based on the technical problem to be solved by the invention, and the matter which can be decomposed, combusted or dissolved by heating comprises inorganic combustible or organic combustible, so that the spherical core prepared from the materials can be effectively and thoroughly removed after high-temperature sintering.
In a preferred embodiment, the spherical core is a sphere or an ellipsoid
In a preferred embodiment, the inorganic material comprises one or more of clay, pulverized coal, gangue powder, diatomite, shale powder, perlite tailing powder, steel slag, slag and metallurgical slag.
The invention also provides a preparation method of the hollow ceramsite, which comprises the following steps:
step 1: drying and crushing the inorganic material to prepare powder, or adding water into the obtained powder according to the mass percent of 20-50% to prepare slurry;
step 2: coating the obtained powder or slurry on the surface of a spherical core made of a substance which can be decomposed, combusted or dissolved by heating to prepare a ceramsite blank;
and step 3: and drying and aging the obtained ceramsite blank in the shade for 12-24h, and then placing the ceramsite blank in a muffle furnace for high-temperature roasting to obtain the hollow ceramsite.
In the scheme, the inorganic material is prepared into powder or slurry, the inorganic material can be coated on the surface of the spherical core in different modes, then the drying and aging treatment is carried out for 12-24h in a ventilated and non-illumination place, so that the adhesion and shape fixation of the inorganic material and the slurry can be enhanced, the phenomena of cracks and the like of the coating layer caused by direct high temperature or illumination can be prevented, the function and use of the ceramsite are influenced, the spherical core can be removed by roasting the aged ceramsite blank at high temperature, only the coating layer formed by the inorganic material is reserved, the coating layer has the characteristics of ventilation, high strength, low density and the like after high-temperature sintering, the ceramsite after high-temperature sintering is of a complete hollow structure, the density is further reduced compared with the existing ceramsite, and the ceramsite has the characteristics of light weight and high strength.
In a preferable scheme, after the inorganic material is dried in a drying oven at the temperature of 80-150 ℃ for 1-2h, ball milling and crushing are carried out, and the whole material passes through a 200-mesh sieve;
the inorganic material is clay, fly ash or coal gangue.
In the scheme, the inorganic material is selected from clay, fly ash or coal gangue, and is dried, crushed and completely passes through a 200-mesh sieve, so that the inorganic material is more conveniently adhered to the surface of the spherical core.
In a preferable scheme, the material of the spherical core in the step 1 comprises any one of carbon, agricultural solid waste (straw and the like), polypropylene pellets or polyethylene pellets, and the spherical core is a sphere with a diameter of 0.3-50mm and made of any one of the materials.
In the scheme, the polypropylene pellets and the polyethylene pellets are commercially available; the carbon pellets are manufactured into required round balls or oval balls according to the requirement after buying raw materials from the market; the agricultural solid waste such as straw can be made into the required round balls or oval balls after being crushed.
In a preferable scheme, the core is soaked in the slurry for 3-5s by adopting a slurry dipping method, and is taken out, and the slurry is naturally coated on the surface of the spherical core to prepare the ceramsite blank;
uniformly spraying the slurry on the surface of the core in a spraying manner to prepare the ceramsite blank; or
And adding the powder and the spherical core into a disc pelletizer simultaneously, spraying water while rolling, and coating the powder on the surface of the spherical core by adding water by a disc coating method to prepare the ceramsite blank.
In a preferable scheme, in the step 3, after the ceramsite blank dried and aged in the shade is placed in the muffle furnace, the temperature is raised to 700 ℃ at the speed of 5-10 ℃/min, and the temperature is kept for 15-30 min; heating to 950 ℃ and 1200 ℃ at the speed of 5-10 ℃/min, and preserving the heat for 15-30 min; naturally cooling to below 50 ℃ to obtain the hollow ceramsite;
the performance of the hollow ceramsite meets the use standard of the lightweight aggregate for concrete.
In the scheme, the temperature is increased to 700 ℃ at the speed of 5-10 ℃/min, which is the temperature for ensuring the removal of the internal spherical core, and if the temperature is not sintered at the stage, the temperature is increased too fast, and the gas generated at a certain stage is too much, the structure of the hollow ceramsite is damaged, and the hollow ceramsite cannot be sintered. After this stage, the temperature is raised to 950 ℃ and 1200 ℃ at the rate of 5-10 ℃/min, so as to ensure the sintering of the shell material and form a high-strength shell.
Example 1
A hollow ceramsite and a preparation method thereof comprise the following steps:
(1) clay is selected as a raw material, dried in a drying oven at 110 ℃ for 1h, and then ball-milled and crushed into 200 meshes. Accurately weighing 500g of crushed clay, adding the crushed clay into water according to the mass percentage of 20%, and uniformly stirring to prepare slurry;
(2) soaking polypropylene pellets with the diameter of 0.3mm in the slurry by adopting a slurry dipping method, taking out after 3 seconds, and naturally coating the polypropylene pellets with clay slurry to prepare a ceramsite blank; placing the ceramsite blank in a ventilated and sunshine-free area, and drying and aging in the shade for 12 hours;
(3) placing the dried and aged ceramsite blank into a muffle furnace for high-temperature roasting, wherein the specific mode is as follows: heating to 300 deg.C at a rate of 5 deg.C/min, and maintaining for 15 min; heating to 950 ℃ at the speed of 5 ℃/min, and keeping the temperature for 15 min; and naturally cooling to below 50 ℃ to prepare the light hollow ceramsite. The performance of the ceramsite meets the use standard of the lightweight aggregate for concrete.
Example 2
A hollow ceramsite and a preparation method thereof comprise the following steps:
(1) clay is selected as a raw material, dried in a drying oven at 130 ℃ for 1.5h, and then ball-milled and crushed into 250 meshes. Accurately weighing 500g of crushed clay, adding the crushed clay into water according to the mass percentage of 40%, and uniformly stirring to prepare slurry;
(2) soaking polypropylene pellets with the diameter of 3mm in the slurry by a slurry dipping method, taking out after 4s, and naturally coating the polypropylene pellets with clay slurry to prepare a ceramsite blank; placing the ceramsite blank in a ventilated sunshine-free area, and drying in the shade and aging for 18 h;
(3) the same as in (3) of example 1.
Example 3
A hollow ceramsite and a preparation method thereof comprise the following steps:
(1) clay is selected as a raw material, dried in a drying oven at 150 ℃ for 2h, and then ball-milled and crushed into 300 meshes. Accurately weighing 500g of crushed clay, adding the crushed clay into water according to the mass percentage of 50%, and uniformly stirring to prepare slurry;
(2) soaking the polypropylene pellets with the diameter of 50mm in the slurry by adopting a slurry dipping method, taking out after 5s, and naturally coating the polypropylene pellets with clay slurry to prepare a ceramsite blank; placing the ceramsite blank in a ventilated and sunshine-free area, and drying in the shade and aging for 24 hours;
(3) the same as in (3) of example 1.
Example 4
A fired hollow ceramsite and a preparation method thereof comprise the following steps:
(1) selecting fly ash as a raw material, drying the fly ash in a drying oven at 110 ℃, then ball-milling and crushing the fly ash into 200 meshes, accurately weighing 500g of fly ash, adding the fly ash into water according to the mass percentage of 20%, and uniformly stirring to prepare slurry; putting the slurry into a spray gun, uniformly spraying the slurry on the outer surface of a carbon pellet with the diameter of 0.3mm, wherein the spraying thickness is about 2mm, and preparing a ceramsite blank; placing in a ventilated and sunshine-free area, and drying in the shade and aging for 12 h;
(2) placing the dried and aged ceramsite blank into a muffle furnace for high-temperature roasting, wherein the specific mode is as follows: heating to 300 deg.C at a rate of 10 deg.C/min, and maintaining for 30 min; heating to 1100 deg.C at a rate of 10 deg.C/min, and maintaining for 30 min; and naturally cooling to below 50 ℃ to obtain the light hollow ceramsite. The performance of the ceramsite meets the use standard of the lightweight aggregate for concrete.
Example 5
A fired hollow ceramsite and a preparation method thereof comprise the following steps:
(1) selecting fly ash as a raw material, drying the fly ash in a drying oven at 130 ℃, then ball-milling and crushing the fly ash into 250 meshes, accurately weighing 500g of fly ash, adding the fly ash into water according to the mass percentage of 40%, and uniformly stirring to prepare slurry; putting the slurry into a spray gun, uniformly spraying the slurry on the outer surface of a carbon pellet with the diameter of 3mm, wherein the spraying thickness is about 1mm, and preparing a ceramsite blank; placing in a ventilated and sunshine-free area, and drying in the shade and aging for 18 h;
(2) the same as in (2) of example 4.
Example 6
A fired hollow ceramsite and a preparation method thereof comprise the following steps:
(1) selecting fly ash as a raw material, drying the fly ash in a drying oven at 150 ℃, then ball-milling and crushing the fly ash into 200 meshes, accurately weighing 500g of fly ash, adding the fly ash into water according to 50% by mass, and uniformly stirring to prepare slurry; putting the slurry into a spray gun, uniformly spraying the slurry on the outer surface of a carbon pellet with the diameter of 50mm, wherein the spraying thickness is about 0.5mm, and preparing a ceramsite blank; placing in a ventilated and sunshine-free area, and drying in the shade and aging for 24 h;
(2) the same as in (2) of example 4.
Example 7
A fired hollow ceramsite and a preparation method thereof comprise the following steps:
(1) selecting coal gangue as a raw material, drying the coal gangue in a drying oven at 110 ℃ for 1h, and then ball-milling and crushing the coal gangue into 200 meshes; accurately weighing 500g of coal gangue, adding the coal gangue onto carbon pellets of 0.3mm rolling in a disc pelletizer, spraying water to pelletize, wrapping the coal gangue on the surfaces of the pellets, wherein the thickness of the coal gangue is about 1mm, and preparing a ceramsite blank. Placing in a ventilated and sunshine-free area, and drying in the shade and aging for 12 h;
(2) and (3) placing the blank into a muffle furnace for firing, wherein the firing system is as follows: heating to 680 deg.C at a rate of 5 deg.C/min, and maintaining for 30 min; heating to 1200 deg.C at a rate of 5 deg.C/min, and maintaining for 30 min; and naturally cooling to below 50 ℃ to obtain the light hollow ceramsite. The performance of the ceramsite meets the use standard of the lightweight aggregate for concrete.
Example 8
A fired hollow ceramsite and a preparation method thereof comprise the following steps:
(1) selecting coal gangue as a raw material, drying the coal gangue in a drying oven at 130 ℃ for 1.5h, and then ball-milling and crushing the coal gangue into 250 meshes; accurately weighing 500g of coal gangue, adding the coal gangue onto a carbon pellet which is 3mm in diameter and rolls in a disk pelletizer, spraying water to pelletize, wrapping the coal gangue on the surface of the pellet, wherein the thickness of the coal gangue is about 0.5mm, and preparing a ceramsite blank. Placing in a ventilated and sunshine-free area, and drying in the shade and aging for 12 h;
(2) the same as in (2) of example 7.
Example 9
A fired hollow ceramsite and a preparation method thereof comprise the following steps:
(1) selecting coal gangue as a raw material, drying the coal gangue in a drying oven at 150 ℃ for 2 hours, and then ball-milling and crushing the coal gangue into 300 meshes; accurately weighing 500g of coal gangue, adding the coal gangue onto 50mm carbon pellets rolled in a disc pelletizer, spraying water to pelletize, wrapping the coal gangue on the surfaces of the pellets, wherein the thickness of the coal gangue is about 0.3mm, and preparing a ceramsite blank. Placing in a ventilated and sunshine-free area, and drying and aging in the shade for 12 h.
(2) The same as in (2) of example 7.
The cylindrical compressive strength, bulk density, apparent density and water absorption of the hollow ceramsite prepared in examples 1-9 were also determined, as shown in Table 1.
TABLE 1
The above embodiments are merely illustrative of the present invention and are not to be construed as limiting the invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and the technical solution of the present invention is covered by the claims of the present invention.
Claims (9)
1. The hollow ceramsite is characterized in that a spherical core is made of a material which can be decomposed, combusted or dissolved by heating, the outer layer of the spherical core is wrapped by an inorganic material, the spherical core is removed by high-temperature sintering, and the inorganic material wrapped by the outer layer is sintered to form a shell with a hollow interior.
2. The hollow ceramsite of claim 1, wherein the material decomposable, combustible, or soluble by heat comprises any one of inorganic combustible materials or organic combustible materials.
3. The hollow ceramsite of claim 1, wherein said spherical core is a sphere or an ellipsoid.
4. The hollow ceramsite according to claim 1, wherein the inorganic material is one or more of clay, pulverized coal, gangue powder, diatomite, shale powder, perlite tailing powder, steel slag, slag and metallurgical slag.
5. The method for preparing the hollow ceramsite according to claims 1-4, wherein the method comprises the following steps:
step 1: drying and crushing the inorganic material to prepare powder, or adding water into the obtained powder according to the mass percent of 20-50% to prepare slurry;
step 2: coating the obtained powder or slurry on the surface of a spherical core made of a substance which can be decomposed, combusted or dissolved by heating to prepare a ceramsite blank;
and step 3: and drying and aging the obtained ceramsite blank in the shade for 12-24h, and then placing the ceramsite blank in a muffle furnace for high-temperature roasting to obtain the hollow ceramsite.
6. The method for preparing hollow ceramsite according to claim 5, wherein the inorganic material is dried in a drying oven at 80-150 ℃ for 1-2h, and then is subjected to ball milling and crushing, and the whole is sieved by a 200-mesh sieve;
the inorganic material is clay, fly ash or coal gangue.
7. The method for preparing hollow ceramsite according to claim 5, wherein the spherical core is made of any one of carbon, agricultural solid waste, polypropylene pellets and polyethylene pellets in step 1, and the spherical core is made of any one of the above materials and has a diameter of 0.3-50 mm.
8. The method for preparing hollow ceramsite according to claim 5, wherein the core is soaked in the slurry for 3-5s by a slurry dipping method, and then taken out, and the slurry is naturally coated on the surface of the spherical core to prepare the ceramsite blank;
uniformly spraying the slurry on the surface of the core in a spraying manner to prepare the ceramsite blank; or
And adding the powder and the spherical core into a disc pelletizer simultaneously, spraying water while rolling, and coating the powder on the surface of the spherical core by adding water by a disc coating method to prepare the ceramsite blank.
9. The method for preparing hollow ceramsite according to claim 5, wherein in the step 3, the ceramsite body dried and aged in the shade is placed in the muffle furnace, heated to 700 ℃ at a speed of 5-10 ℃/min, and then kept warm for 15-30 min; heating to 950 ℃ and 1200 ℃ at the speed of 5-10 ℃/min, and preserving the heat for 15-30 min; naturally cooling to below 50 ℃ to obtain the hollow ceramsite;
the performance of the hollow ceramsite meets the use standard of the lightweight aggregate for concrete.
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| CN112002453A (en) * | 2020-09-07 | 2020-11-27 | 成都赐进金属材料有限公司 | Anti-radiation composite ball and preparation method thereof |
| CN112851403A (en) * | 2021-02-04 | 2021-05-28 | 西安建筑科技大学 | Hollow phase change energy storage ceramsite and preparation method thereof |
| CN113234510A (en) * | 2021-04-26 | 2021-08-10 | 福建省南安市海特机械有限公司 | Environment-friendly sludge ceramsite automatic production line and process |
| CN115636687A (en) * | 2022-05-09 | 2023-01-24 | 中冶长天国际工程有限责任公司 | Method and system for preparing light ceramsite by using heavy metal tailings |
| CN115710136A (en) * | 2022-09-27 | 2023-02-24 | 河南建筑材料研究设计院有限责任公司 | Hollow heat-insulation ceramsite and preparation method thereof |
| CN115974525A (en) * | 2023-01-12 | 2023-04-18 | 重庆聚源塑料股份有限公司 | Light ceramsite and preparation method and application thereof |
| CN116082058A (en) * | 2023-01-14 | 2023-05-09 | 商洛学院 | Iron tailing-based super-strong ceramsite, preparation method thereof and concrete containing iron tailing-based super-strong ceramsite |
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