CN111018384B - Hollow ceramsite and preparation method thereof - Google Patents
Hollow ceramsite and preparation method thereof Download PDFInfo
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- CN111018384B CN111018384B CN201911283048.7A CN201911283048A CN111018384B CN 111018384 B CN111018384 B CN 111018384B CN 201911283048 A CN201911283048 A CN 201911283048A CN 111018384 B CN111018384 B CN 111018384B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 24
- 238000001035 drying Methods 0.000 claims abstract description 34
- 229910010272 inorganic material Inorganic materials 0.000 claims abstract description 32
- 239000011147 inorganic material Substances 0.000 claims abstract description 32
- 239000000843 powder Substances 0.000 claims abstract description 25
- 239000000463 material Substances 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 230000032683 aging Effects 0.000 claims abstract description 14
- 238000005245 sintering Methods 0.000 claims abstract description 13
- 239000000126 substance Substances 0.000 claims abstract description 9
- 239000004567 concrete Substances 0.000 claims abstract description 8
- 239000003245 coal Substances 0.000 claims description 31
- 239000008188 pellet Substances 0.000 claims description 24
- 239000010881 fly ash Substances 0.000 claims description 22
- 239000004927 clay Substances 0.000 claims description 18
- 238000000576 coating method Methods 0.000 claims description 14
- -1 polypropylene Polymers 0.000 claims description 14
- 239000002994 raw material Substances 0.000 claims description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- 239000004743 Polypropylene Substances 0.000 claims description 10
- 229910052799 carbon Inorganic materials 0.000 claims description 10
- 229920001155 polypropylene Polymers 0.000 claims description 10
- 238000000498 ball milling Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 7
- 238000005096 rolling process Methods 0.000 claims description 4
- 238000010298 pulverizing process Methods 0.000 claims 1
- 239000002002 slurry Substances 0.000 abstract description 34
- 238000010438 heat treatment Methods 0.000 abstract description 18
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000005507 spraying Methods 0.000 description 15
- 239000011248 coating agent Substances 0.000 description 11
- 239000011257 shell material Substances 0.000 description 11
- 238000005303 weighing Methods 0.000 description 9
- 239000011247 coating layer Substances 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 238000001816 cooling Methods 0.000 description 6
- 239000002893 slag Substances 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- 238000007598 dipping method Methods 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 239000002910 solid waste Substances 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011372 high-strength concrete Substances 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 235000019362 perlite Nutrition 0.000 description 2
- 239000010451 perlite Substances 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 150000003384 small molecules Chemical class 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000010902 straw Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- UBAZGMLMVVQSCD-UHFFFAOYSA-N carbon dioxide;molecular oxygen Chemical compound O=O.O=C=O UBAZGMLMVVQSCD-UHFFFAOYSA-N 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Images
Classifications
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Civil Engineering (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
本发明公开了中空陶粒，是以受热可分解、燃烧或溶解的物质为材料制成的球形核心，球形核心外层用无机材料包裹，经高温烧结，球形核心去除，而外层包裹的无机材料烧结形成内部中空的壳体。还公开了其制备方法，包括以下步骤：步骤1：无机材料经干燥粉碎处理后制成粉料，或者所得粉料中按质量百分比为20％‑50％加入水制成浆体；步骤2：将所得粉料或浆体包裹于球形核心表面，制成陶粒坯体；步骤3：将所得陶粒坯体阴干陈化后，再高温烧结，得到中空陶粒。本发明制备的中空陶粒改变现有陶粒内部多孔的结构，完全成为中空的结构，并且经过高温烧结之后，在保证了强度高的前提下，进一步降低了密度，利于广泛的应用于高强低密度混凝土的制备中。
The invention discloses hollow ceramsite, which is a spherical core made of a substance that can be decomposed, combusted or dissolved by heating. The outer layer of the spherical core is wrapped with inorganic materials. The material is sintered to form a shell that is hollow inside. A preparation method thereof is also disclosed, including the following steps: Step 1: the inorganic material is dried and pulverized to make powder, or the obtained powder is 20%-50% by mass and water is added to make a slurry; Step 2: The obtained powder or slurry is wrapped on the surface of the spherical core to make a ceramsite body; step 3: after drying and aging the obtained ceramsite body, it is sintered at a high temperature to obtain a hollow ceramsite. The hollow ceramsite prepared by the invention changes the internal porous structure of the existing ceramsite and completely becomes a hollow structure, and after high temperature sintering, the density is further reduced on the premise of ensuring high strength, which is beneficial to be widely used in high strength and low strength Preparation of 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. Therefore, how to further reduce the density of the ceramsite is a problem which needs to be solved urgently 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.
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| 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 |
| CN113234510B (en) * | 2021-04-26 | 2022-02-18 | 福建省南安市海特机械有限公司 | Environment-friendly sludge ceramsite automatic production line and process |
| CN115636687B (en) * | 2022-05-09 | 2023-11-14 | 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 |
| CN115710136B (en) * | 2022-09-27 | 2023-05-12 | 河南建筑材料研究设计院有限责任公司 | A kind of hollow insulation ceramsite and preparation method thereof |
| CN115974525B (en) * | 2023-01-12 | 2023-10-27 | 重庆聚源塑料股份有限公司 | A kind of lightweight ceramsite and its preparation method and application |
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