Ceramic water permeable brick with surface coating and preparation process of ceramic water permeable brick

Abstract

The invention discloses a ceramic water permeable brick with a surface coating and a preparation process thereof, and the preparation process comprises the following steps: pressing all raw materials of a matrix to obtain the matrix; mixing the raw materials of the surface layer, adding water, and grinding to obtain surface layer slurry, wherein the solid content of the surface layer slurry is 60-70%; spraying the surface layer slurry on a substrate, drying and sintering to obtain the water permeable brick. Wherein the surface layer is prepared from the following raw materials in percentage by mass: 6 to 17 percent of alkaline metal precursor and 6 to 17 percent of fluoride. According to the preparation process disclosed by the invention, the alkaline metal precursor and the fluoride are added into the raw materials of the surface layer, and the expansion coefficient of the glaze is increased, so that gaps of the filled water-permeable brick particles are recovered in the water-permeable brick firing and cooling step.

Description

Technical Field

[0001] The invention belongs to the field of permeable bricks, and in particular relates to a ceramic permeable brick with a surface coating and a preparation process thereof. Background Art

[0002] Ceramic permeable bricks are made by recycling construction solid waste as a skeleton, adding an appropriate amount of binder / pore-forming agent and other materials, pressing and forming them, and then sintering them at high temperature. The use of ceramic permeable bricks can make some urban precipitation flow effectively into the ground, on the one hand reducing the pressure on the urban sewer system and the pollution to rivers, lakes, and the cost of sewage treatment. On the other hand, it can replenish groundwater, overcome the disadvantage of impermeable urban roads, and thus slow down the trend of ground subsidence caused by the decline in groundwater levels.

[0003] Many businesses will make coatings on the surface of the permeable brick base to give the permeable bricks good decorative functions. However, since conventional glazes will fill the gaps between the permeable brick particles after glazing the surface of the permeable brick base, the permeability coefficient of the permeable brick will be reduced and the permeability performance will be reduced. Summary of the Invention

[0004] The present invention provides a ceramic permeable brick with a surface coating and a preparation process thereof, aiming to solve the problem in the prior art that glazing on the permeable brick substrate leads to a decrease in the permeability coefficient of the permeable brick and a decrease in the permeability performance.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present invention provides a process for preparing a ceramic permeable brick having a surface coating, comprising:

[0007] pressing all raw materials of the matrix to obtain the matrix;

[0008] The raw materials of the surface layer are mixed and ground with water to obtain a surface layer slurry, wherein the solid content of the surface layer slurry is 60%-75%;

[0009] Spraying the surface layer slurry on the substrate, drying and sintering to obtain permeable bricks;

[0010] The raw materials of the surface layer include 6-17% by mass of an alkaline metal precursor and 6-17% by mass of a fluoride.

[0011] Since conventional glazes will fill the gaps between the permeable brick particles after being glazed on the surface of the permeable brick base, the permeability coefficient of the permeable brick will be reduced and the permeability performance will be reduced; therefore, when preparing the surface layer, the present invention adds an appropriate amount of alkaline metal precursors and fluorides. The alkaline metal precursors and fluorides can increase the expansion coefficient of the glaze. The glaze can shrink significantly when the permeable brick is cooled after firing, so that the gaps between the filled permeable brick particles are restored to the void.

[0012] Among them, the addition of barium carbonate and fluorite can increase the whiteness of the surface glaze after firing, reduce the firing temperature of the surface glaze, and improve the solar reflectivity of the radiation cooling glaze.

[0013] Furthermore, the alkaline metal precursor is selected from at least one of barium carbonate, barium oxide, barium hydroxide, sodium carbonate, potassium carbonate, potassium hydroxide, calcium oxide, and calcium hydroxide.

[0014] At high temperatures, barium carbonate decomposes into barium oxide (BaO). As an alkaline metal oxide, BaO disrupts the silicon-oxygen network in the glass structure, reducing the degree of polymerization. Since a looser silicon-oxygen network generally increases the thermal expansion coefficient, BaO can increase the expansion coefficient of permeable bricks by reducing the degree of polymerization. Similarly, the introduction of alkaline metal oxides such as Na2O, K2O, CaO, and BaO into glazes will have a similar effect.

[0015] Furthermore, the fluoride is selected from at least one of fluorite and barium fluoride.

[0016] Fluorite, primarily composed of CaF2, can replace oxygen ions at high temperatures or react with the silicon-oxygen network to form volatile substances such as SiF4, resulting in a reduction in the silica content in the glaze. Silica is a network former, and this reduction makes the permeable brick structure looser and increases the coefficient of expansion. Furthermore, fluoride may promote crystallization, and if the precipitated crystals have a higher coefficient of expansion, this will also affect the overall expansion. Similarly, the introduction of fluorides such as barium fluoride into the glaze will have a similar effect.

[0017] Furthermore, the raw materials of the surface layer also include, by mass, 10-15 parts of feldspar, 10-15 parts of quartz, 6-10 parts of kaolin, 0.3-0.5 parts of sodium tripolyphosphate, and 0.2-0.4 parts of sodium methylcellulose.

[0018] That is, the raw materials for the surface layer of the ceramic permeable brick with a surface coating disclosed in the present invention include, by weight, 10-15 parts of feldspar, 10-15 parts of quartz, 6-10 parts of kaolin, 6-10 parts of an alkaline metal precursor, 6-10 parts of fluoride, 0.3-0.5 parts of sodium tripolyphosphate, and 0.2-0.4 parts of sodium methylcellulose. Furthermore, the alkaline metal precursor and fluoride each account for 6-17% by weight of the raw materials in the entire surface layer.

[0019] Furthermore, in the step of mixing the raw materials of the surface layer and adding water, the amount of water is 35-40 parts, and thus it can be deduced that the solid content of the surface layer slurry is 60%-75%.

[0020] Furthermore, the surface layer slurry is sprayed on the substrate to form a spray layer, and the thickness of the spray layer is 1-2 mm.

[0021] Furthermore, the spraying includes pouring the surface slurry onto the substrate, with a glaze amount of 1500-2500g / m 2 .

[0022] Furthermore, the raw materials of the surface layer also include a refrigerant, and the raw materials of the refrigerant include, by mass, 50-70 parts of Al2O3, 5-15 parts of SiO2, 5-15 parts of CaO, 25-10 parts of ZnO, and 2-5 parts of ZrO2.

[0023] Furthermore, the drying condition is 100-200° C. for 2-4 hours; and the sintering condition is 1150-1300° C. for 1-2 hours.

[0024] Furthermore, the raw materials of the matrix include, by mass, 40-60 parts of ceramic crushed materials, 10-20 parts of granite crushed materials, 10-20 parts of inorganic binder, and 2-5 parts of pore former; the inorganic binder includes one or more combinations of bentonite, kaolin, and ball clay, and the pore former includes one or more combinations of straw, sawdust, starch, and fly ash.

[0025] Since the glaze can fill some of the gaps in the upper layer of the permeable brick base, it is equivalent to applying a layer of particles with a certain thickness and slightly smaller gaps on the upper layer of the permeable brick base. Therefore, there is no need to apply finer-grained crushed materials on the surface of the base for secondary pressing, which can achieve the effect of beautiful and delicate surface and increase the strength of the permeable brick. At the same time, it also greatly simplifies the production process, reduces energy consumption, and reduces production costs.

[0026] In a second aspect, the present invention provides a ceramic permeable brick with a surface coating, which is prepared by the preparation process of the ceramic permeable brick with a surface coating as described in any one of the first aspects.

[0027] The beneficial effects of the present invention compared with the prior art are:

[0028] The present invention discloses a ceramic permeable brick with a surface coating and a preparation process thereof, comprising pressing all raw materials of a base to obtain a base; mixing the raw materials of a surface layer and grinding them with water to obtain a surface layer slurry, wherein the surface layer slurry has a solid content of 60%-70%; spraying the surface layer slurry on the base, drying, and sintering to obtain a permeable brick; wherein the raw materials of the surface layer include 6-17% by mass of an alkaline metal precursor and 6-17% by mass of a fluoride, and the alkaline metal precursor and fluoride added to the raw materials of the surface layer increase the expansion coefficient of the glaze, so that the glaze can significantly shrink during the cooling step of the permeable brick after firing, thereby restoring the gaps between the filled permeable brick particles, thereby achieving glazing on the permeable brick base while maintaining the permeability of the permeable brick;

[0029] Since the glaze can fill some of the gaps in the upper layer of the permeable brick base, it is equivalent to applying a layer of particles with slightly smaller gaps of a certain thickness on the upper layer of the permeable brick base. Therefore, there is no need to apply finer-grained crushed materials or perform secondary pressing on the surface of the base to achieve the effect of beautiful and delicate surface and increased strength of the permeable brick, which simplifies the production process, reduces energy consumption and lowers production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 This is a schematic diagram of the structure of a ceramic permeable brick with a surface coating prepared in Example 1 of the present invention, where the white portion is the surface coating;

[0032] Figure 2 This is a schematic structural diagram of a ceramic permeable brick with a surface coating prepared in Example 1 of the present invention from another direction;

[0033] Figure 3 This is a schematic diagram of the permeable brick preparation process disclosed in Example 1. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0036] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the present invention. As used in the specification and appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0037] The present invention will be described in further detail below in conjunction with specific examples. It should be noted that the specific examples are provided to explain the present invention rather than to limit it. Unless otherwise specified, the present invention has no particular limitation on the sources of the components and commercially available products or conventional products known to those skilled in the art may be used.

[0038] It should be noted that, in the present invention, the number of parts of all raw materials is measured by mass. It should be understood that mass parts refers to the proportional measurement relationship of the mass of each component. When specifically implemented, the mass parts can be converted into specific mass units such as grams, kilograms or tons according to actual production needs. The addition amount of all raw materials in the present invention is measured by absolute dry weight or pure substance mass. If the raw material itself contains crystal water or carrier components, the content of its active ingredient needs to be converted to 100% purity calculation; when it comes to a multi-component system, the sum of the mass parts of each component constitutes a 100% mass reference system, and the mass ratio of each component should strictly maintain the proportional relationship recorded in the specification. In addition, the mass part system in the present invention has a proportional amplification characteristic. During actual production, the total amount of raw materials can be proportionally expanded or reduced while keeping the mass ratio of each component unchanged.

[0039] Example 1

[0040] A preparation process for ceramic permeable bricks with surface coating, such as Figure 3 As shown, the following steps are included:

[0041] preparing a substrate;

[0042] S1. Weigh 50 parts of ceramic crushed materials, 10 parts of granite crushed materials, 1 part of inorganic binder, 2 parts of pore-forming agent, and 25 parts of water, mix them evenly, and then press them into shape to obtain a matrix. The average particle size of the ceramic crushed materials and the granite crushed materials is 4 mm.

[0043] Preparation of surface slurry

[0044] S2. Mix and grind 25 parts of refrigerant, 13 parts of feldspar, 13 parts of quartz, 8 parts of kaolin, 8 parts of barium carbonate, 8 parts of fluorite, 0.3 parts of sodium tripolyphosphate, 0.3 parts of sodium methylcellulose, and 38 parts of water to obtain a surface layer slurry. The refrigerant raw materials are 60 parts of Al2O3, 10 parts of SiO2, 10 parts of CaO, 8 parts of ZnO2, and 4 parts of ZrO2. The solid content of the surface layer slurry is approximately 63%, and the weight ratio of barium carbonate and fluorite to the surface layer raw materials is approximately 12%.

[0045] Preparation of permeable bricks

[0046] S3, spray the surface layer slurry on the substrate, dry it at 150℃ for 3h, and sinter it at 1200℃ for 2h to obtain a permeable brick. Figure 1 and Figure 2 Among them, spraying is to spray a layer of surface slurry glaze through a linear glazing machine, the thickness of the glaze is 1mm, and the glaze amount is 1500g / m 2 .

[0047] Example 2

[0048] A preparation process of a ceramic permeable brick with a surface coating comprises the following steps:

[0049] preparing a substrate;

[0050] S1. Weigh 60 parts of ceramic crushed materials, 20 parts of granite crushed materials, 20 parts of kaolin, 5 parts of starch, and 30 parts of water, mix them evenly, and then press them into shape to obtain a matrix. The average particle size of the ceramic crushed materials and the granite crushed materials is 4 mm.

[0051] Preparation of surface slurry

[0052] S2. Mix and grind 40 parts of refrigerant, 15 parts of feldspar, 15 parts of quartz, 10 parts of kaolin, 10 parts of barium carbonate, 10 parts of fluorite, 0.5 parts of sodium tripolyphosphate, 0.4 parts of sodium methylcellulose, and 35 parts of water to obtain a surface layer slurry. The refrigerant raw materials are 70 parts of Al2O3, 15 parts of SiO2, 15 parts of CaO, 10 parts of ZnO2, and 5 parts of ZrO2. The solid content of the surface layer slurry is approximately 75%, and the weight ratio of barium carbonate and fluorite to the surface layer raw materials is approximately 9%.

[0053] Preparation of permeable bricks

[0054] S3, spray the surface layer slurry on the substrate, dry it at 150℃ for 3h, and sinter it at 1200℃ for 2h to obtain a permeable brick. The spraying is to spray a layer of surface slurry glaze by a linear glazing machine, the glaze thickness is 1mm, and the glaze amount is 1500g / m 2 .

[0055] Example 3

[0056] A preparation process of a ceramic permeable brick with a surface coating comprises the following steps:

[0057] preparing a substrate;

[0058] S1. Weigh 40 parts of ceramic crushed materials, 10 parts of granite crushed materials, 10 parts of ball clay, 2 parts of fly ash, and 20 parts of water, mix them evenly, and then press them into shape to obtain a matrix. The average particle size of the ceramic crushed materials and the granite crushed materials is 4 mm.

[0059] Preparation of surface slurry

[0060] S2. Mix and grind 25 parts of a refrigerant, 10 parts of feldspar, 10 parts of quartz, 6 parts of kaolin, 6 parts of barium carbonate, 6 parts of fluorite, 0.3 parts of sodium tripolyphosphate, 0.2 parts of sodium methylcellulose, and 35 parts of water to obtain a surface layer slurry. The refrigerant raw materials are 50 parts of Al2O3, 25 parts of SiO2, 5 parts of CaO, 25 parts of ZnO, and 22 parts of ZrO2. The solid content of the surface layer slurry is approximately 64%, and the weight ratio of barium carbonate and fluorite to the surface layer raw materials is approximately 9%.

[0061] Preparation of permeable bricks

[0062] S3, spray the surface layer slurry on the substrate, dry it at 150℃ for 3h, and sinter it at 1200℃ for 2h to obtain a permeable brick. The spraying is to spray a layer of surface slurry glaze by a linear glazing machine, the glaze thickness is 1mm, and the glaze amount is 1500g / m 2 .

[0063] Example 4 differs from Example 1 in that barium carbonate is replaced by barium oxide, and fluorite is replaced by cryolite. Specifically:

[0064] S2. Mix and grind 25 parts of refrigerant, 3 parts of feldspar, 13 parts of quartz, 8 parts of kaolin, 8 parts of barium oxide, 8 parts of barium fluoride, 0.3 parts of sodium tripolyphosphate, 0.3 parts of sodium methylcellulose, and 38 parts of water to obtain a surface layer slurry.

[0065] Example 5 differs from Example 1 in that barium carbonate is replaced by barium hydroxide, and fluorite is replaced by barium fluoride. Specifically:

[0066] S2. Mix and grind 25 parts of refrigerant, 3 parts of feldspar, 13 parts of quartz, 8 parts of kaolin, 8 parts of barium hydroxide, 8 parts of cryolite, 0.3 parts of sodium tripolyphosphate, 0.3 parts of sodium methylcellulose, and 38 parts of water to obtain a surface layer slurry.

[0067] Example 6 differs from Example 1 in that barium carbonate is replaced by potassium hydroxide, and fluorite is replaced by a mixture of barium fluoride and fluorite in equal proportions. Specifically:

[0068] S2. Mix and grind 25 parts of refrigerant, 3 parts of feldspar, 13 parts of quartz, 8 parts of kaolin, 8 parts of potassium hydroxide, 4 parts of barium fluoride, 4 parts of fluorite, 0.3 parts of sodium tripolyphosphate, 0.3 parts of sodium methylcellulose, and 38 parts of water to obtain a surface layer slurry.

[0069] Example 7 differs from Example 1 in that barium carbonate is replaced by calcium oxide, and fluorite is replaced by barium fluoride. Specifically:

[0070] S2. Mix and grind 25 parts of refrigerant, 3 parts of feldspar, 13 parts of quartz, 8 parts of kaolin, 8 parts of calcium oxide, 8 parts of barium fluoride, 0.3 parts of sodium tripolyphosphate, 0.3 parts of sodium methylcellulose, and 38 parts of water to obtain a surface layer slurry.

[0071] Example 8 is different from Example 1 only in that all the raw materials used for the surface layer are: 6 parts of barium carbonate, 6 parts of fluorite, 3 parts of kaolin, 5 parts of quartz, 20 parts of potassium-sodium feldspar, 6 parts of zinc oxide, 10 parts of sodium bicarbonate, 5 parts of strontium carbonate and 5 parts of lepidolite.

[0072] Example 9 is different from Example 1 only in that the surface layer raw materials use 11 parts of barium carbonate and 11 parts of fluorite.

[0073] In comparative example 1, ordinary ceramic permeable bricks without glaze were used.

[0074] Comparative Example 2 uses permeable bricks containing conventional glaze (without barium carbonate / fluorite).

[0075] Comparative Example 3 differs from Example 1 only in that no fluoride is added to the surface layer raw materials. Specifically, the raw materials used for the surface layer are 25 parts of refrigerant, 10 parts of feldspar, 10 parts of quartz, 6 parts of kaolin, 6 parts of barium carbonate, 0.3 parts of sodium tripolyphosphate, 0.2 parts of sodium methyl cellulose, and 35 parts of water.

[0076] Comparative Example 4 differs from Example 1 only in that no alkaline metal precursor is added to the surface layer raw materials. Specifically, the raw materials used for the surface layer are 25 parts of refrigerant, 10 parts of feldspar, 10 parts of quartz, 6 parts of kaolin, 6 parts of fluorite, 0.3 parts of sodium tripolyphosphate, 0.2 parts of sodium methyl cellulose, and 35 parts of water.

[0077] Comparative Example 5 is different from Example 1 only in that the surface layer raw materials use 5 parts of barium carbonate and 5 parts of fluorite.

[0078] Comparative Example 6 is different from Example 1 only in that the surface layer raw materials use 15 parts of barium carbonate and 15 parts of fluorite.

[0079] To further illustrate the technical effects of the present invention, the permeable bricks of Examples 1-8 and Comparative Examples 1-6 were tested for performance, and their water permeability coefficient, flexural strength, solar reflectivity, surface temperature difference, glaze whiteness, and porosity were tested. The water permeability coefficient, flexural strength, solar reflectivity, glaze whiteness, and porosity were tested after 28 days of standard curing of the permeable bricks. According to the standards "Permeable Pavement Bricks and Permeable Pavement Slabs" (GB / T 25993-2023), "Permeable Concrete" (JC / T 2558-2020), "Standard for Test Methods of Physical and Mechanical Properties of Concrete" (GB / T 50081-2019), and "Test Method for Reflectivity and Emissivity of Materials and Coatings" (GJB 5023.1A-2012), the surface temperature difference was detected by infrared thermal imaging and compared with the surface temperature of Comparative Example 1. The size of the permeable brick sample was 400×800mm. The test results are shown in Table 1 below.

[0080] Table 1 Performance test results of various embodiments and comparative examples

[0081]

[0082] In combination with Examples 1-9 and the data in Table 1, it can be seen that, compared with the comparative example, the water permeability coefficient of the ceramic permeable bricks prepared by the process of adding alkaline metal precursors and fluorides to the raw materials of the surface layer has been greatly improved, and glazing can be achieved on the permeable brick substrate while maintaining the water permeability of the permeable bricks. In addition, the permeable bricks obtained by selecting barium carbonate as the alkaline metal precursor and fluorite as the fluoride have better air permeability.

[0083] In combination with Example 1 and Comparative Examples 3-6, and in combination with the data in Table 1, it can be seen that the use of alkaline metal precursors and fluorides alone can also improve the water permeability of permeable bricks, but the improvement effect is not as good as the combination of alkaline metal precursors and fluorides. In combination with Example 1 and Comparative Examples 5-6, the use of higher and lower proportions of barium carbonate and fluorite will have a greater impact on the performance of the permeable bricks obtained. Although the permeable brick sample obtained by using 15 parts of barium carbonate and fluorite has better water permeability than the permeable brick samples obtained in each Example 1, the surface layer of the sample shrinks greatly during the firing process and is easy to peel off, which does not meet the use requirements. The permeable brick obtained by using 5 parts of barium carbonate and fluorite has poor water permeability and cannot meet the use requirements.

[0084] In summary, the present invention adds alkaline metal precursors and fluorides to the raw materials of the surface layer, interrupts the silicon-oxygen network, reduces the polymerization degree of the glass and increases the thermal expansion coefficient of the glaze, so that after the glaze is applied on the permeable brick and fired, not only the gaps between the permeable brick particles are not filled, but the gaps between the filled permeable brick particles are restored to the original state. The ceramic permeable brick products produced by this process have a water permeability coefficient of up to 2.3*10 -2The flexural strength can reach more than 55Mpa; at the same time, through the refrigerant added to the raw materials of the surface layer, the product has a solar reflectivity of more than 90%, which can effectively reduce the ground temperature, promote ecological water circulation, and reduce environmental problems such as humidity and heat in the rainy season in summer.

[0085] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A process for preparing ceramic permeable bricks with a surface coating, characterized in that: include: pressing all raw materials of the matrix to obtain the matrix; The raw materials of the surface layer are mixed and ground with water to obtain a surface layer slurry, wherein the solid content of the surface layer slurry is 60%-75%; Spraying the surface layer slurry on the substrate, drying and sintering to obtain permeable bricks; The raw materials of the surface layer include 6-17% by mass of an alkaline metal precursor and 6-17% by mass of a fluoride.

2. The process for preparing ceramic permeable bricks with surface coating according to claim 1, characterized in that: The alkaline metal precursor is selected from at least one of barium carbonate, barium oxide, barium hydroxide, sodium carbonate, potassium carbonate, potassium hydroxide, calcium oxide, and calcium hydroxide.

3. The process for preparing ceramic permeable bricks with surface coating according to claim 1, characterized in that: The fluoride is selected from at least one of fluorite and barium fluoride.

4. The process for preparing ceramic permeable bricks with surface coating according to claim 1, characterized in that: The raw materials of the surface layer further include: by mass: 10-15 parts of feldspar, 10-15 parts of quartz, 6-10 parts of kaolin, 0.3-0.5 parts of sodium tripolyphosphate, and 0.2-0.4 parts of sodium methylcellulose.

5. The process for preparing ceramic permeable bricks with surface coating according to claim 1, characterized in that: The surface layer slurry is sprayed on the substrate to form a spray layer, and the thickness of the spray layer is 1-2 mm.

6. The process for preparing ceramic permeable bricks with surface coating according to claim 5, characterized in that: The spraying includes pouring the surface slurry onto the substrate, with a glaze amount of 1500-2500g / m 2 .

7. The process for preparing ceramic permeable bricks with surface coating according to claim 1, characterized in that: The raw materials of the surface layer also include refrigerant, and the raw materials of the refrigerant include, by mass, 50-70 parts of Al2O3, 5-15 parts of SiO2, 5-15 parts of CaO, 5-10 parts of ZnO2, and 2-5 parts of ZrO2.

8. The process for preparing ceramic permeable bricks with surface coating according to claim 1, characterized in that: The drying condition is 100-200° C. for 2-4 hours; the sintering condition is 1150-1300° C. for 1-2 hours.

9. The process for preparing ceramic permeable bricks with surface coating according to claim 1, characterized in that: The raw materials of the matrix include, by mass, 40-60 parts of ceramic crushed materials, 10-20 parts of granite crushed materials, 10-20 parts of inorganic binder, and 2-5 parts of pore-forming agent; the inorganic binder includes one or more combinations of bentonite, kaolin, and ball clay, and the pore-forming agent includes one or more combinations of straw, sawdust, starch, and fly ash.

10. A ceramic permeable brick with a surface coating, characterized in that: The ceramic permeable brick is prepared by the preparation process of the ceramic permeable brick with surface coating as described in any one of claims 1 to 9.

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