CN110156365B - Reflective heat-insulation colored sand, preparation method and application - Google Patents
Reflective heat-insulation colored sand, preparation method and application Download PDFInfo
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- CN110156365B CN110156365B CN201910469893.7A CN201910469893A CN110156365B CN 110156365 B CN110156365 B CN 110156365B CN 201910469893 A CN201910469893 A CN 201910469893A CN 110156365 B CN110156365 B CN 110156365B
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/06—Quartz; Sand
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/12—Multiple coating or impregnating
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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
- C04B28/24—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 alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
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Abstract
The invention discloses reflective heat-insulation colored sand, a preparation method and application thereof, and belongs to the technical field of building coatings. The reflective heat-insulation colored sand comprises silicate mineral grains, wherein the outer surfaces of the silicate mineral grains are wrapped with reflective heat-insulation layers, and the reflective heat-insulation layers sequentially comprise a bottom slurry layer and a surface slurry layer from inside to outside; the preparation method comprises four steps of preparation of silicate mineral grain premix, preparation of bottom slurry and surface slurry, preparation of bottom sand and preparation of reflective heat-insulation colored sand, and has simple preparation process and strong practicability; the color sand of the invention is mainly used as an outer wall heat insulation coating or a roof surface heat insulation coating. The reflective heat-insulation colored sand has the advantages of excellent weather resistance, low oil absorption rate, excellent near-infrared reflectance and excellent solar reflectance, is rich in color, can be used as reflective heat-insulation coatings on the surfaces of different substrates, and is simple in preparation method and high in practicability.
Description
Technical Field
The invention relates to the technical field of architectural coatings, in particular to reflective heat-insulation colored sand, a preparation method and application thereof.
Background
The color sand is divided into natural color sand and artificial color sand. The natural colored sand has good heat conducting property and high heat storage capacity, can isolate sunlight irradiation in summer as a building material of an outer wall of a house, and prevents indoor energy from being consumed by about 100-150 kWh/square meter, and energy consumed by heating and cooling in a building with a glass wall surface is 300-700 kWh/square meter, but the natural colored sand has the defects of insufficient bright color, large color difference, less color variety and the like; the artificial colored sand overcomes the defects of natural colored sand, is applied to asphalt shingles of villas in western countries on a large scale, and a layer of inorganic basalt colored sand particles is embedded in the surface of the asphalt shingles, so that the artificial asphalt shingle colored sand not only has an attractive effect, but also has the effect of enhancing the weather resistance of roof asphalt shingles, and can be applied on a large scale at first due to various advantages of the asphalt shingles. Meanwhile, due to the gradual regulation and limitation of the state on the random excavation in recent years, the raw materials of the natural colored sand are gradually reduced, and the use of the stable and weather-proof excellent artificial high-temperature sintered colored sand with rare types, single color and single color gradually becomes a trend.
The nature of insulation is to block 3 modes of heat transfer: heat conduction, convection, heat radiation. The heat insulation coating is mainly divided into three types of (inorganic) barrier type heat insulation coating, reflective building heat insulation coating and radiation heat insulation coating according to different heat insulation mechanisms, wherein the reflective type heat insulation coating reflects most of energy irradiated on the coating by the sun by utilizing the high reflection effect of a colored sand coating on light and heat instead of being absorbed by the coating, and meanwhile, the coating has small heat conductivity coefficient and effectively cuts off the heat conduction path.
At present, although most of reflection type heat insulation coating products in the market can meet the requirements of new national standards, the surface of a coating formed by the coating is polluted along with the prolonging of the service time, so that the reflection performance of the coating is far lower than the initial value, and the high-quality reflection heat insulation coating has good pollution resistance and durability while meeting the requirements of the reflection heat insulation performance, namely, the long-term reflection heat insulation effect can be kept. The invention provides a novel reflective heat insulation material with long-term stable and effective reflective heat insulation performance.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide reflective heat-insulation colored sand, a preparation method and application thereof.
In order to achieve the purpose, the invention adopts the technical scheme that the reflective heat-insulation colored sand comprises silicate ore particles, wherein a reflective heat-insulation layer is wrapped on the outer surface of each silicate ore particle, and the reflective heat-insulation layer sequentially comprises a bottom slurry layer and a surface slurry layer from inside to outside.
The preferable technical scheme is that the silicate mineral grains comprise 60-80% of quartz sand with different grain diameters, 10-20% of 80-120 mesh and 10-30% of 120-200 mesh in weight ratio; the bottom slurry layer is formed by calcining bottom slurry, and the weight ratio of each component in the bottom slurry is 30-50% of water glass, 20-30% of kaolin, 1-10% of industrial borax, 10-30% of rutile titanium dioxide, 5-10% of nano zinc oxide, and the balance of water; the surface slurry layer is formed by calcining surface slurry, and the weight ratio of each component in the surface slurry is 30-60% of water glass, 20-30% of kaolin, 5-20% of inorganic cold pigment, 5-10% of rutile titanium dioxide and the balance of water.
Further preferably, the base slurry also comprises an inorganic cold pigment reinforcing agent, and the weight ratio of the inorganic cold pigment reinforcing agent is 0.5-1.5%.
The preferable technical scheme is that the particle size of the kaolin is 800-2000 meshes.
In order to facilitate the preparation and implementation of the reflective heat-insulation colored sand, a preparation method of the reflective heat-insulation colored sand is provided, and the preparation method comprises the following steps:
s1: preparation of silicate mineral particle premix: selecting and screening silicate mineral particles, and uniformly mixing the silicate mineral particles with different particle sizes according to the weight ratio of 60-80% of 40-80 meshes, 10-20% of 80-120 meshes and 10-30% of 120-200 meshes to obtain a silicate mineral particle premix;
s2: preparing bottom slurry and surface slurry:
preparing a bottom slurry, namely adding water glass, kaolin with the particle size of 800-2000 meshes, industrial borax, rutile titanium dioxide, nano zinc oxide and water into a frosted dispersion machine according to the weight ratio of the components in the surface slurry, and grinding for 1-2 hours to obtain the bottom slurry;
preparing a surface paste, namely adding water glass, kaolin with the particle size of 800-2000 meshes, inorganic cold pigment, rutile titanium dioxide and water into a frosted dispersion machine according to the weight ratio of the components, and grinding for 1-2 hours to obtain the surface paste;
s3: preparing the bottom sand: adding the silicate mineral particle premix obtained in the step S1 and the bottom slurry obtained in the step S2 into a rotary roller furnace according to a certain mass ratio, mixing, drying until the silicate mineral particles attached with the bottom slurry can flow, transferring the silicate mineral particles attached with the bottom slurry into a calcining kiln for calcining, controlling the calcining temperature to be 600-1100 ℃ and the calcining time to be 25-50 min, and sending the calcined silicate mineral particles to a cooling kiln to be cooled to below 100 ℃ to obtain bottom sand;
s4: preparing reflective heat-insulation colored sand: and (3) adding the bottom sand obtained in the step S3 and the surface slurry obtained in the step S2 into a rotary roller furnace according to a certain mass ratio, mixing, drying until the bottom sand attached with the surface slurry can flow, transferring the bottom sand attached with the surface slurry into a calcining kiln furnace for calcining, controlling the calcining temperature to be 600-900 ℃ and the calcining time to be 20-60 min, and sending the calcined bottom sand to a cooling kiln furnace to be cooled to below 60 ℃ to obtain the reflective heat-insulating colored sand.
In the preferable technical scheme, the 325-mesh residual mass of the bottom slurry and the surface slurry in the step S2 is less than 0.5 percent.
The preferable technical scheme is that the mass ratio of the slurry to the silicate mineral grain premix in the step S3 is 1: 7-13, the mass ratio of the slurry to the bottom sand in the step S4 is 1: 12-15, the injection amount of the slurry in the step S3 is 160-280 kg/h, and the injection amount of the slurry in the step S4 is 150-200 kg/h.
Preferably, the material raising plate in the rotary drum furnace adopted in the step S3 or the step S4 is arranged obliquely, the drum of the rotary drum furnace can drive the silicate ore particles or the bottom sand to turn over by self-rotation, the silicate ore particles and the bottom slurry sprayed on the surface of the silicate ore particles, the bottom sand and the surface slurry sprayed on the surface of the bottom sand are uniformly mixed, and the mixture is dried under the condition of hot air at 150-200 ℃.
In order to better facilitate the application and implementation of the reflective insulation colored sand, the reflective insulation colored sand is applied as an outer wall insulation coating or a roof surface insulation coating.
The invention has the advantages and beneficial effects that:
1. the reflective heat-insulation colored sand comprises silicate ore particles, and a bottom slurry layer and a surface slurry layer which are sequentially wrapped on the outer surfaces of the silicate ore particles, wherein the bottom slurry contains rutile titanium dioxide; in addition, the bottom slurry layer has excellent affinity with the surface slurry, and the slurry layer and the bottom sand are fused into a whole after calcination, so that the reflective heat-insulation colored sand has excellent weather resistance and reflective heat-insulation durability.
2. The silicate ore particles are quartz sand with different particle sizes, so that the reflective heat-insulation colored sand particles also have different particle sizes, and when the colored sand is used as a coating, the colored sand with different particle sizes can be fully and naturally filled with each other, so that a coating layer formed by the colored sand has good compactness, and the colored sand coating layer is ensured to have excellent oil stain permeation prevention and reflective heat insulation effects; in addition, the surface slurry layer of the reflective heat-insulation colored sand contains rutile titanium dioxide, and the rutile titanium dioxide can perform catalytic oxidation degradation on organic matters attached to the surface of the rutile titanium dioxide under the sunlight, so that the colored sand has excellent self-cleaning effect and the lasting effectiveness of reflective heat insulation.
3. The surface slurry and the bottom slurry both contain rutile titanium dioxide, so that the reflective heat-insulating colored sand has excellent near-infrared reflectance and excellent solar reflectance; the primer slurry also contains inorganic cold pigment and inorganic cold pigment reinforcing agent, so that the reflective heat-insulating colored sand is better and more colorful in color.
4. The reflective heat-insulation colored sand is made of inorganic materials, has longer service life and lower raw material investment cost compared with organic heat-insulation coating.
5. The preparation method of the reflective heat-insulation colored sand is simple, and the manufacture and implementation of the colored sand are convenient.
6. The reflective heat-insulating colored sand can be used as an outer wall heat-insulating coating or a roof surface heat-insulating coating.
Drawings
FIG. 1 is a flow chart of the preparation process of the reflective insulation colored sand of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1
The method for preparing the yellow reflective heat-insulation colored sand comprises the following steps:
s1: preparation of silicate mineral particle premix: directly selecting 6#, 7#, 8# sand from quartz sand ore, and using a screen to carry out gradation adjustment, and mixing silicate ore particles with different particle sizes according to the weight ratio: 40-80 mesh 63%, 80-120 mesh 20%, 120-200 mesh 17% to obtain silicate mineral particle premix;
s2: preparing bottom slurry and surface slurry:
preparing a bottom slurry, namely adding 38% of water glass, 22% of kaolin, 8% of industrial borax, 17% of rutile titanium dioxide, 5% of nano zinc oxide and 10% of water in parts by weight into a frosted dispersion machine, and grinding for 1.2 hours to obtain the bottom slurry;
preparing a surface slurry, namely adding 38% of water glass, 30% of kaolin, 7% of yellow titanium yellow cold pigment, 5% of rutile titanium dioxide and 20% of water into a frosted dispersion machine, and grinding for 1.2 hours to obtain yellow surface slurry;
s3: preparing the bottom sand: adding the silicate mineral grain premix obtained in the step S1 and the bottom slurry obtained in the step S2 into a rotary roller furnace in a mass ratio of 1: 8 for mixing, wherein the spraying amount of the bottom slurry in the step S3 is 250kg/h, drying until the silicate mineral grains attached with the bottom slurry can flow, transferring the silicate mineral grains attached with the bottom slurry into a calcining kiln for calcining, controlling the calcining temperature to be 800 ℃ and the calcining time to be 40min, and sending the calcined silicate mineral grains to a cooling kiln for cooling to be below 100 ℃ to obtain bottom sand;
s4: preparing reflective heat-insulation colored sand: and (3) adding the bottom sand in the step S3 and the yellow surface slurry in the step S2 into a rotary roller furnace in a mass ratio of 1: 13.3, mixing, wherein the spraying amount of the yellow surface slurry in the step S4 is 150kg/h, drying until the bottom sand attached with the surface slurry can flow, transferring the bottom sand attached with the surface slurry into a calcining kiln for calcining, controlling the calcining temperature to be 800 ℃ and the calcining time to be 50min, and sending the calcined bottom sand to a cooling kiln to be cooled to below 60 ℃ to obtain the yellow reflective heat-insulation colored sand.
Example 2
The method for preparing the red reflective heat-insulation colored sand comprises the following steps:
s1: preparation of silicate mineral particle premix: directly selecting 6#, 7#, 8# sand from quartz sand ore, and using a screen to carry out gradation adjustment, and mixing silicate ore particles with different particle sizes according to the weight ratio: 70 percent of 40-80 meshes, 15 percent of 80-120 meshes and 15 percent of 120-200 meshes are uniformly mixed to obtain silicate mineral particle premix;
s2: preparing bottom slurry and surface slurry:
preparing a bottom slurry, namely adding 30% of water glass, 27% of kaolin, 1% of industrial borax, 30% of rutile titanium dioxide, 10% of nano zinc oxide, 1% of iron oxide red (inorganic cold pigment reinforcing agent) and 1% of water in parts by weight into a frosted dispersion machine, and grinding for 1.5 hours to obtain the bottom slurry;
preparing a surface slurry, namely adding 30% of water glass, 26% of kaolin, 5% of red cold pigment toner, 10% of rutile titanium dioxide and 29% of water into a frosted dispersion machine, and grinding for 1.5 hours to obtain red surface slurry;
s3: preparing the bottom sand: adding the silicate mineral grain premix obtained in the step S1 and the bottom slurry obtained in the step S2 into a rotary roller furnace in a mass ratio of 1: 10 for mixing, wherein the spraying amount of the bottom slurry in the step S3 is 200kg/h, drying until the silicate mineral grains attached with the bottom slurry can flow, transferring the silicate mineral grains attached with the bottom slurry into a calcining kiln for calcining, controlling the calcining temperature to be 1000 ℃ and the calcining time to be 25min, and sending the calcined silicate mineral grains to a cooling kiln for cooling to be below 100 ℃ to obtain bottom sand;
s4: preparing reflective heat-insulation colored sand: and (3) adding the bottom sand in the step S3 and the red surface slurry in the step S2 into a rotary roller furnace in a mass ratio of 1: 12.5, mixing, wherein the spraying amount of the red surface slurry in the step S4 is 160kg/h, drying until the bottom sand attached with the surface slurry can flow, transferring the bottom sand attached with the surface slurry into a calcining kiln for calcining, controlling the calcining temperature to be 900 ℃ and the calcining time to be 30min, and sending the calcined bottom sand to a cooling kiln to be cooled to below 60 ℃ to obtain the red reflective heat-insulation colored sand.
Example 3
The method for preparing the green reflective heat-insulation colored sand comprises the following steps:
s1: preparation of silicate mineral particle premix: directly selecting 6#, 7#, 8# sand from quartz sand ore, and using a screen to carry out gradation adjustment, and mixing silicate ore particles with different particle sizes according to the weight ratio: uniformly mixing 80% of 40-80 meshes, 10% of 80-120 meshes and 10% of 120 meshes and 200 meshes to obtain silicate mineral particle premix;
s2: preparing bottom slurry and surface slurry:
preparing a bottom slurry, namely adding 48% of water glass, 20% of kaolin, 8% of industrial borax, 10% of rutile titanium dioxide, 8% of nano zinc oxide and 6% of water in parts by weight into a frosted dispersion machine, and grinding for 2 hours to obtain the bottom slurry;
preparing a surface paste, namely adding 60% of water glass, 20% of kaolin, 10% of green cold pigment toner, 6% of rutile titanium dioxide and 4% of water into a frosted dispersion machine, and grinding for 2 hours to obtain green surface paste;
s3: preparing the bottom sand: adding the silicate mineral grain premix obtained in the step S1 and the bottom slurry obtained in the step S2 into a rotary roller furnace in a mass ratio of 1: 12.5 for mixing, wherein the spraying amount of the bottom slurry in the step S3 is 160kg/h, drying until the silicate mineral grains attached with the bottom slurry can flow, transferring the silicate mineral grains attached with the bottom slurry into a calcining kiln for calcining, controlling the calcining temperature to be 600 ℃ and the calcining time to be 50min, and sending the calcined silicate mineral grains to a cooling kiln for cooling to be below 100 ℃ to obtain bottom sand;
s4: preparing reflective heat-insulation colored sand: and (3) adding the bottom sand obtained in the step S3 and the green surface slurry obtained in the step S2 into a rotary roller furnace in a mass ratio of 1: 13.3, mixing, wherein the spraying amount of the green surface slurry obtained in the step S4 is 150kg/h, drying until the bottom sand attached with the surface slurry can flow, transferring the bottom sand attached with the surface slurry into a calcining kiln for calcining, controlling the calcining temperature to be 600 ℃ and the calcining time to be 60min, and sending the calcined bottom sand to a cooling kiln to be cooled to below 60 ℃ to obtain the green reflective heat-insulation colored sand.
The reflective insulation color sand prepared in the examples 1 to 3 is subjected to thermal insulation performance tests according to the GB/T25261-2018 reflective insulation coating for buildings and JG/T235-2014 reflective insulation coating for buildings, and the test results are shown in Table 1.
Table 1 test results of heat insulating properties of reflective heat insulating colored sand in examples 1 to 3
The experimental results show that: in examples 1 to 3, when the reflective insulation colored sand prepared by the method is used as a coating, the solar reflectance ratio, the far infrared reflectance ratio, the hemispherical emissivity, the change rate of the solar reflectance ratio after pollution and the change rate of the solar reflectance ratio after artificial weathering all meet the regulations of relevant standards of GB/T25261-2018 reflective insulation coating for buildings and JG/T235-2014 reflective insulation coating for buildings, which shows that the reflective insulation colored sand prepared by the method has excellent reflective insulation effect and self-cleaning effect, and the purpose of the invention is achieved.
The preparation process of the heat-insulating colored sand can realize continuous production, so that the color adjustment of the colored sand is easy to control, the color consistency of the colored sand is easy to control, and the color can be quickly adjusted; the color paste is simple and quick to produce; the color sand prepared by the invention is continuously colored by adopting the rotary drum furnace from the mixing of the silicate mineral grains and the color paste, the silicate mineral grains and the color paste are continuously mixed and colored at the front part of the rotary drum furnace, and the mineral grains after mixing and drying are continuously discharged from the discharge opening at the tail part of the rotary drum furnace, thereby solving the problem that the discharging must be stopped and the continuous production cannot be carried out after the mixing of each batch of color paste and mineral grains is finished by adopting a vertical mixer, and improving the overall production efficiency of the color sand.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. The reflective heat-insulation colored sand is characterized by comprising silicate mineral grains, wherein the outer surfaces of the silicate mineral grains are wrapped with reflective heat-insulation layers, and the reflective heat-insulation layers sequentially comprise a bottom slurry layer and a surface slurry layer from inside to outside;
the bottom slurry layer is formed by calcining bottom slurry, and the weight ratio of each component in the bottom slurry is 30-50% of water glass, 20-30% of kaolin, 1-10% of industrial borax, 10-30% of rutile titanium dioxide, 5-10% of nano zinc oxide, and the balance of water;
the surface slurry layer is formed by calcining surface slurry, and the weight ratio of each component in the surface slurry is 30-60% of water glass, 20-30% of kaolin, 5-20% of inorganic cold pigment, 5-10% of rutile titanium dioxide and the balance of water;
the bottom slurry layer is wrapped by bottom slurry and is calcined on the outer surface of the silicate ore particles, and bottom sand is formed;
the surface slurry layer is wrapped by surface slurry and calcined on the outer surface of the bottom sand, and the reflective heat-insulation colored sand is formed.
2. The reflective heat-insulating colored sand according to claim 1, wherein the silicate mineral grains comprise quartz sand with different grain sizes, and the weight ratio of the silicate mineral grains is 40-80 meshes 60-80%, 80-120 meshes 10-20%, and 120-200 meshes 10-30%.
3. The reflective insulation colored sand of claim 2, wherein the kaolin has a particle size of 800 to 2000 mesh.
4. The preparation method of the reflective insulation colored sand, which is used for preparing the reflective insulation colored sand of claim 3, is characterized by comprising the following steps:
s1: preparation of silicate mineral particle premix: selecting and screening silicate mineral particles, and uniformly mixing the silicate mineral particles with different particle sizes according to the weight ratio of claim 2 to obtain a silicate mineral particle premix;
s2: preparing bottom slurry and surface slurry:
preparing a bottom slurry, namely adding water glass, kaolin, industrial borax, rutile titanium dioxide, nano zinc oxide and water into a frosting disperser according to the weight ratio of each component in the surface slurry of claim 3, and grinding for 1-2 hours to obtain the bottom slurry;
preparing a surface paste, namely adding water glass, kaolin, inorganic cold pigment, rutile titanium dioxide and water into a frosted dispersion machine according to the weight ratio of the components in the claim 3, and grinding for 1-2 hours to obtain the surface paste;
s3: preparing the bottom sand: adding the silicate mineral particle premix obtained in the step S1 and the bottom slurry obtained in the step S2 into a rotary roller furnace according to a certain mass ratio, mixing, drying until the silicate mineral particles attached with the bottom slurry can flow, transferring the silicate mineral particles attached with the bottom slurry into a calcining kiln for calcining, controlling the calcining temperature to be 600-1100 ℃ and the calcining time to be 25-50 min, and sending the calcined silicate mineral particles to a cooling kiln to be cooled to below 100 ℃ to obtain bottom sand;
s4: preparing reflective heat-insulation colored sand: and (3) adding the bottom sand obtained in the step S3 and the surface slurry obtained in the step S2 into a rotary roller furnace according to a certain mass ratio, mixing, drying until the bottom sand attached with the surface slurry can flow, transferring the bottom sand attached with the surface slurry into a calcining kiln furnace for calcining, controlling the calcining temperature to be 600-900 ℃ and the calcining time to be 20-60 min, and sending the calcined bottom sand to a cooling kiln furnace to be cooled to below 60 ℃ to obtain the reflective heat-insulating colored sand.
5. The method for preparing reflective insulation colored sand according to claim 4, wherein the 325-mesh residual mass of the bottom slurry and the surface slurry in the step S2 is less than 0.5%.
6. The method for preparing reflective insulation colored sand according to claim 5, wherein the mass ratio of the bottom slurry to the silicate mineral grain premix in the step S3 is 1: 7-13, the mass ratio of the top slurry to the bottom sand in the step S4 is 1: 12-15, the injection amount of the bottom slurry in the step S3 is 160-280 kg/h, and the injection amount of the top slurry in the step S4 is 150-200 kg/h.
7. The method for preparing reflective insulation colored sand according to claim 6, wherein the material raising plate in the rotary drum furnace adopted in step S3 or step S4 is arranged obliquely, the drum of the rotary drum furnace can drive the silicate ore particles or the bottom sand to turn over by self-rotation, the silicate ore particles are uniformly mixed with the bottom slurry sprayed on the surface of the silicate ore particles, the bottom sand and the surface slurry sprayed on the surface of the bottom sand, and the mixture is dried under the condition of hot air at 150-200 ℃.
8. Use of reflective insulation colored sand according to claim 7 as exterior wall insulation coating or roof surface insulation coating.
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| CN111960858A (en) * | 2020-07-17 | 2020-11-20 | 广东双匠新型环保建材科技有限公司 | Preparation method of colored sand and product thereof |
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