Chemically bonded ceramic environment-friendly water permeable brick and preparation method thereof

Abstract

The application relates to a chemical bonding ceramic environment-friendly water permeable brick and a preparation method thereof. The preparation method of the water permeable brick comprises the following steps: S1, mixing basalt, a first solid filler and a first alkaline solid compound, performing ball milling and screening, and obtaining a screening residue mixture; S2, filling the screening residue mixture into a mold with a ventilation hole and sprinkling water to wet; the filling height of the screening residue mixture in the mold is 10-20 mm; S3, mixing a phosphate aqueous solution, a second alkaline solid chemical and a second solid filler to prepare a chemical bonding ceramic material; S4, spraying the chemical bonding ceramic material into the mold to react with the screening residue mixture; S5, repeating steps S2-S4 until the mold is completely filled and is closed; and S6, after the material in the mold is solidified, demolding, curing and polishing are performed to prepare the water permeable brick. In the preparation process of the water permeable brick, no organic binder is used, and high-temperature sintering or fermentation is not needed, so that the preparation process is more energy-saving and environment-friendly.

Description

Technical Field

[0001] This application relates to the field of environmentally friendly permeable building materials technology, and in particular to a chemically bonded ceramic environmentally friendly permeable brick and its preparation method. Background Technology

[0002] Permeable bricks originated in the Netherlands. Initially, the bricks themselves were not permeable; the approximately 2mm gaps between the bricks allowed rainwater to seep into the ground, replenishing moisture and preventing ground subsidence. In urbanization, with increasing awareness of ecological protection, the concept of "sponge cities" has emerged. Permeable bricks, as one of the main permeable paving materials, are used in sidewalks, plazas, and various garden and landscape paths. Permeable bricks effectively collect rainwater to replenish groundwater and contribute to reducing pressure on municipal drainage networks and mitigating urban flooding.

[0003] Patent CN 106810205A discloses a high-strength permeable brick and its preparation method. The method involves crushing and ball-milling waste tempered glass to a mesh size greater than 80 mesh, mixing it with waste gravel (60-80 mesh) and calcium carbonate powder (greater than 80 mesh), adding the mixture to a plaster mold, heating it to approximately 800℃ to demold and form a base layer (48-50 mm thick). Then, cement, water, and sand (30-60 mesh) are mixed with activated carbon (greater than 60 mesh) to form a surface material, which is coated onto the base layer and cured to form a surface layer (3-5 mm thick), thus producing a high-strength permeable brick. Patent CN 106673528A discloses a high-strength, non-fired permeable brick and its preparation method. The non-fired permeable brick is prepared from lean granular material, cement, rod-shaped minerals, and a binder. The rod-shaped minerals comprise 2-4% by weight, and the binder is one or any combination of epoxy resin, polyurethane resin, and acrylic resin with good weather resistance. Patent CN 108439952 A discloses a high-strength permeable brick and its preparation method using low-grade white clay and expanded perlite as the main raw materials. The materials include low-grade white clay, expanded perlite, sodium hydroxide, sodium bicarbonate, gum arabic and carbon powder. The resulting green body is sintered in a high-temperature furnace at 950℃~1050℃ for 2h~3h, and then naturally cooled with the furnace to obtain the permeable brick product. Patent CN 108046705 A discloses a method for preparing high-strength zeolite permeable bricks. First, resin is carbonized and pulverized, and then modified by oxidative treatment. Next, ethyl orthosilicate is added to a mixture of alkali, aluminum source sodium aluminate, and modified carbonized skeleton particles to synthesize carbonized skeleton particles. Under the action of potassium thiocyanate, the adsorption activity of molecular sieves is improved. The carbonized skeleton particles of highly adsorption-active zeolite molecular sieve deposited on the surface are mixed and fermented with lemon juice, tartaric acid, and acidophilic bacteria to improve the hydrophilicity of zeolite and obtain a self-made permeable filler. Finally, the self-made permeable filler is compounded with cement, sodium silicate solution, etc., and injected into a film and cured to obtain high-strength zeolite permeable bricks.

[0004] It is evident that the production of permeable bricks in the aforementioned existing patents primarily utilizes organic molecular adhesives, which undoubtedly increases the emission of volatile organic compounds (VOCs), thus adversely affecting the environment. Furthermore, the production process of permeable bricks requires high-temperature treatment (such as resin carbonization) or fermentation processes, generating substantial carbon emissions, which also negatively impact the environment. Therefore, there is a need to provide an environmentally friendly permeable brick whose production process does not use organic binders and can reduce carbon emissions. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this application provides a chemically bonded ceramic environmentally friendly permeable brick and its preparation method. The adhesive used in the preparation process of the chemically bonded ceramic environmentally friendly permeable brick is an inorganic chemically bonded ceramic material, without the use of any organic binder. Furthermore, the preparation process does not require high-temperature sintering or fermentation, thus achieving low carbon emissions and reducing energy consumption.

[0006] Therefore, the first aspect of this application provides a method for preparing chemically bonded ceramic environmentally friendly permeable bricks, the method comprising the following steps:

[0007] S1, after mixing volcanic rock, the first solid filler and the first alkaline solid compound, the mixture is ball-milled and sieved to obtain a sieve residue mixture;

[0008] S2, the sieved residue mixture is filled into a mold with ventilation holes and moistened with water; the filling height of the sieved residue mixture in the mold is 10-20mm;

[0009] S3, chemically bonded ceramic material is prepared by mixing an aqueous phosphate solution, a second basic solid chemical, and a second solid filler;

[0010] S4, chemically bonded ceramic material is sprayed into the mold and reacted with the sieve residue mixture;

[0011] S5. Repeat steps S2-S4 until the mold is filled and then close the mold.

[0012] S6. After the material in the mold has solidified, demolding, curing and polishing are carried out to obtain chemically bonded ceramic environmentally friendly permeable bricks.

[0013] The inventors of this application discovered through research that, in the preparation process of chemically bonded ceramic permeable bricks, simply mixing the prepared chemically bonded ceramic material with the main raw materials of the permeable brick, volcanic rock and solid fillers, and then bonding them resulted in poor bonding effects. Therefore, in step S1 of the preparation of chemically bonded ceramic permeable bricks, this application involves mixing the main raw materials of the permeable brick, volcanic rock and solid fillers, with an alkaline solid compound and then ball milling them. Ball milling ensures that a certain amount of alkaline solid compound adheres to the surface of both the volcanic rock particles and the solid filler particles. This allows the phosphate-containing chemically bonded ceramic material added later to react in situ with the alkaline solid compound adhering to the surface of the volcanic rock particles and solid filler particles, enhancing the bonding effect and resulting in chemically bonded ceramic permeable bricks with superior compressive strength.

[0014] This application can remove the first alkaline solid compound that is not adhered to the surface of the volcanic rock and the first solid filler by screening, so that the sieve residue mixture consists of volcanic rock particles and solid filler particles with a certain amount of alkaline solid compound adhering to their surfaces.

[0015] In step S2 of this application, the height of the mold used is generally 40mm to 50mm to prepare permeable bricks with a height of 40mm to 50mm. During the preparation of the permeable bricks in this application, steps S2-S4 need to be repeated multiple times until the mold is full. The purpose of multiple fillings is to maximize the porosity of the resulting permeable bricks, thereby increasing their permeability. The inventors of this application have discovered through research that if a preparation method that fills the mold in one filling step is used, the permeable pores of the resulting permeable bricks are easily blocked, especially when the adhesive viscosity is too high, leading to a significant decrease in the permeability of the resulting permeable bricks.

[0016] In some embodiments, in step S1, the mass ratio of the volcanic rock, the first solid filler, and the first alkaline solid compound is (5-40):(5-40):1.

[0017] In this application, the volcanic rock and the first solid filler are the main raw materials for preparing the environmentally friendly permeable brick. The first solid filler is used to fill the gaps between the volcanic rock particles, thereby enhancing the compressive strength of the resulting environmentally friendly permeable brick. The first alkaline solid compound is used to adhere to the surface of the volcanic rock particles and the solid filler particles, and to react in situ with the phosphate-containing chemically bonded ceramic material added later, thereby enhancing the bonding effect. The inventors of this application have discovered through research that when the dosage relationship of the volcanic rock, the first solid filler, and the first alkaline solid compound is controlled within the above-mentioned range, the final environmentally friendly permeable brick can have better adhesion, compressive strength, and permeability.

[0018] In some specific embodiments, the mass ratio of the volcanic rock, the first solid filler, and the first alkaline solid compound can be 5:5:1, 10:10:1, 15:15:1, 20:20:1, 25:25:1, 30:30:1, 35:35:1, or 40:40:1, etc. In some preferred embodiments, the mass ratio of the volcanic rock, the first solid filler, and the first alkaline solid compound is (20-30):(20-30):1; for example, 20:20:1, 25:25:1, or 30:30:1.

[0019] This application can further improve the overall performance of the environmentally friendly permeable bricks by optimizing the mass ratio of the volcanic rock, the first solid filler, and the first alkaline solid compound.

[0020] In some embodiments, in step S3, the mass ratio of phosphate, second alkaline solid chemical, and second solid filler in the phosphate aqueous solution is (1-10):20:(1-7).

[0021] In this application, the phosphate in the phosphate aqueous solution can react with the second alkaline solid compound to generate an inorganic binder with adhesive properties. The second solid filler is used to increase the viscosity of the aforementioned inorganic binder with adhesive properties. Therefore, mixing the phosphate aqueous solution, the second alkaline solid chemical, and the second solid filler can produce a chemically bonded ceramic material with a certain viscosity, which can then be used as an adhesive in the preparation of the environmentally friendly permeable brick. By controlling the mass ratio of phosphate, the second alkaline solid chemical, and the second solid filler in the phosphate aqueous solution within the aforementioned range, this application can improve the bonding performance of the obtained chemically bonded ceramic material and ultimately enhance the compressive strength of the obtained environmentally friendly permeable brick.

[0022] In some specific embodiments, the mass ratio of phosphate, the second alkaline solid chemical, and the second solid filler in the phosphate aqueous solution can be 1:20:1, 5:20:1, 10:20:1, 5:20:3, 5:20:7, etc. In some preferred embodiments, the mass ratio of phosphate, the second alkaline solid chemical, and the second solid filler in the phosphate aqueous solution is 5:20:(1-7); in some most preferred embodiments, the mass ratio of phosphate, the second alkaline solid chemical, and the second solid filler in the phosphate aqueous solution is 5:20:3.

[0023] This application can further improve the bonding performance of the prepared chemically bonded ceramic material by optimizing the mass ratio of phosphate, second alkaline solid chemical and second solid filler in phosphate aqueous solution.

[0024] In some embodiments, the mass ratio of the chemically bonded ceramic material to the sieve residue mixture is 1:(3-8). In some preferred embodiments, the mass ratio of the chemically bonded ceramic material to the sieve residue mixture is 1:5.

[0025] This application controls the mass ratio of the chemically bonded ceramic material to the sieve residue mixture within the above-mentioned range, enabling the first alkaline solid compound adhering to the surface of the volcanic rock particles and solid filler particles in the sieve residue mixture to fully react in situ with the phosphate in the chemically bonded ceramic material, thereby effectively bonding the volcanic rock and solid filler.

[0026] It is worth noting that the chemically bonded ceramic material prepared by mixing the phosphate aqueous solution, the second alkaline solid chemical, and the second solid filler needs to be immediately sprayed onto the mold with ventilation holes in step S2 to avoid excessive reaction between the phosphate in the phosphate aqueous solution and the second alkaline solid compound, which would cause the prepared chemically bonded ceramic material to harden.

[0027] In this application, the phosphate aqueous solution in step S3 is prepared by mixing phosphate with water, and the mass concentration of phosphate in the phosphate aqueous solution can be 35-40%. This application does not explicitly limit the specific type of phosphate. In some specific embodiments, the phosphate can be selected from one or more of ammonium dihydrogen phosphate, potassium dihydrogen phosphate, sodium dihydrogen phosphate, and calcium dihydrogen phosphate; in some preferred embodiments, the phosphate is ammonium dihydrogen phosphate or potassium dihydrogen phosphate.

[0028] In some embodiments, the first solid filler and the second solid filler are each independently selected from one or more of kaolin, metakaolin, sepiolite, wollastonite, attapulgite, quartz sand, fly ash and montmorillonite.

[0029] In this application, the first solid filler and the second solid filler may be the same or different, but are preferably the same. This application does not explicitly limit the particle size of the first solid filler and the second solid filler. In some specific embodiments, the particle size of the first solid filler and the second solid filler is below 800 mesh.

[0030] In some embodiments, the first alkaline solid compound and the second alkaline solid compound are each independently selected from one or more of magnesium oxide, aluminum oxide, magnesium hydroxide, aluminum hydroxide, and basic magnesium borate.

[0031] In this application, the first alkaline solid compound and the second alkaline solid compound may be the same or different, but are preferably the same. In some preferred embodiments, the first alkaline solid compound and the second alkaline solid compound are the same, and are one or more of magnesium oxide, magnesium hydroxide, or basic magnesium borate.

[0032] This application, by optimizing the specific types of the first and second alkaline solid compounds, can further improve the bonding performance of the prepared chemically bonded ceramic material and the overall performance of the final environmentally friendly permeable brick.

[0033] In some embodiments, the average particle size of the volcanic rock is 0.5–15 mm. In some preferred embodiments, the average particle size of the volcanic rock is 5–10 mm.

[0034] In this application, by controlling the particle size of the volcanic rock within the aforementioned range, the compressive strength and permeability of the resulting environmentally friendly permeable brick can be further improved. If the particle size of the volcanic rock is too small, the gaps between the volcanic rock particles are insufficient, resulting in poor permeability of the resulting environmentally friendly permeable brick; if the particle size of the volcanic rock is too large, the resulting environmentally friendly permeable brick will be prone to defects and will have lower compressive strength.

[0035] In some embodiments, the ball mill rotates at a speed of 50 to 100 rpm for 20 to 40 minutes.

[0036] This application utilizes ball milling to allow a certain amount of a first alkaline solid compound to adhere to the surface of volcanic rock and a first solid filler. Therefore, the milling speed has a significant impact on adhesion. If the milling speed is too low, such as below 50 rpm, the adhesion effect will be poor; if the milling speed is too high, such as above 100 rpm, it will damage the particle size of the volcanic rock, thereby reducing the compressive strength and permeability of the resulting permeable brick.

[0037] In some embodiments, in step S2, the ratio of the amount of water sprayed to the mass of the sieve residue mixture is 1:(20-60).

[0038] In this application, wetting the sieve residue mixture with water increases the mass exchange rate between the alkaline solid compounds in the mixture and the subsequently added phosphates, allowing the phosphate-containing chemically bonded ceramic material to fully react with the alkaline compounds on the surfaces of the volcanic rock and solid fillers, resulting in effective bonding. By controlling the amount of water sprayed within the aforementioned range, this application further optimizes the reaction rate.

[0039] In some embodiments, in step S3, phosphoric acid is also added to the raw materials for preparing the chemically bonded ceramic material, and the mass ratio of phosphoric acid to phosphate in the phosphate aqueous solution is 1:(1-5). In some preferred embodiments, the mass ratio of phosphoric acid to phosphate in the phosphate aqueous solution is 1:3.

[0040] The inventors of this application have creatively discovered through research that introducing phosphoric acid into the raw materials for preparing chemically bonded ceramic materials can further improve the adhesion of the prepared chemically bonded ceramic materials. Moreover, when the mass ratio of the phosphoric acid to the phosphate in the phosphate aqueous solution is controlled within the range of 1:(1 to 5), especially 1:3, the adhesion performance of the prepared chemically bonded ceramic materials is optimal, and the compressive strength of the prepared environmentally friendly permeable bricks is the best.

[0041] In step S2 of this application, the purpose of using a mold with ventilation holes is to expel excess air from the mold when the chemically bonded ceramic material is sprayed into the mold later, thereby enhancing the fluidity of the liquid and avoiding safety hazards caused by excessive pressure inside the mold due to exothermic reaction.

[0042] In step S6 of this application, the curing can be carried out at room temperature in the air, and the curing time can be, for example, 18 to 24 hours.

[0043] The second aspect of this application provides a chemically bonded ceramic environmentally friendly permeable brick prepared as described in the first aspect of this application.

[0044] The chemically bonded ceramic environmentally friendly permeable bricks described in this application have excellent permeability and high compressive strength. Moreover, the preparation process is free of organic pollution and can be carried out at room temperature without the need for high-temperature sintering or fermentation, which effectively reduces carbon emissions during the production process.

[0045] The beneficial technical effects of this application are as follows: The preparation method of the chemically bonded ceramic environmentally friendly permeable brick provided in this application uses inorganic chemically bonded ceramic materials as the adhesive in the preparation process, without using any organic binders, thus reducing organic pollution. Furthermore, during the preparation process, a certain amount of alkaline solid compounds are adhered to the surface of the volcanic rock and solid filler, the main raw materials of the permeable brick, through ball milling, enhancing the bonding effect. Simultaneously, this method does not require high-temperature sintering or fermentation during the preparation process, achieving room-temperature preparation, effectively reducing carbon emissions and energy consumption. Moreover, the resulting chemically bonded ceramic environmentally friendly permeable brick has excellent permeability and high compressive strength, making it well-suited for application in the field of building materials technology, with promising application prospects. Attached Figure Description

[0046] Figure 1 The image shows the XRD pattern of the chemically bonded ceramic material prepared in Example 1. Detailed Implementation

[0047] To make this application easier to understand, the following detailed description is provided in conjunction with embodiments. These embodiments are for illustrative purposes only and are not intended to limit the scope of application of this application. Unless otherwise specified, the raw materials or components used in this application can be obtained commercially or by conventional methods.

[0048] Example 1: Preparation of chemically bonded ceramic environmentally friendly permeable bricks

[0049] (1) Volcanic rock, the first solid filler and the first alkaline solid compound are added to a ball mill in a mass ratio of 25:25:1. The mixture is ball milled at 80 rpm for 30 minutes and then poured into a sieve to remove the first alkaline solid compound that does not adhere to the surface of the volcanic rock and the first solid filler, and the residue mixture is obtained. The average particle size of the volcanic rock is 10 mm, the first solid filler is 800 mesh kaolin, and the first alkaline solid compound is magnesium hydroxide.

[0050] (2) Fill the sieve residue mixture obtained in step (1) into a stainless steel mold with a mold height of 40 mm and ventilation holes (the filling height of the sieve residue mixture in the mold is about 15 mm), and wet it with water. The ratio of water to sieve residue mixture is 1:30.

[0051] (3) A chemically bonded ceramic material was prepared by mixing a phosphate aqueous solution, a second basic solid compound, and a second solid filler. The phosphate aqueous solution had a mass concentration of 40%, and the mass ratio of phosphate, the second basic solid compound, and the second solid filler in the phosphate aqueous solution was 5:20:3. The phosphate was potassium dihydrogen phosphate, the second basic solid compound was magnesium hydroxide, and the second solid filler was 800-mesh kaolin. X-ray diffraction analysis was performed on the prepared chemically bonded ceramic material, and its XRD pattern was as follows: Figure 1 As shown.

[0052] (4) The chemically bonded ceramic material obtained in step (3) is immediately sprayed onto the mold in step (2) using a high-pressure sprayer. The mass ratio of the chemically bonded ceramic material to the sieve residue mixture is 1:5. After being vibrated evenly, the chemically bonded ceramic material reacts fully with the magnesium hydroxide on the surface of the volcanic rock and kaolin, and is effectively bonded.

[0053] (5) Repeat steps (2)-(4) until the mold is completely filled and then close the mold;

[0054] (6) Wait 40 minutes until the material in the mold is completely solidified before demolding. Cure in the air for 24 hours. After curing, grind the blank to make it smooth and form a chemically bonded ceramic environmentally friendly permeable brick.

[0055] Example 2: Preparation of chemically bonded ceramic environmentally friendly permeable bricks

[0056] The preparation process is basically the same as in Example 1, except that in step (1), volcanic rock, the first solid filler and the first alkaline solid compound are added to the ball mill in a mass ratio of 5:5:1.

[0057] Example 3: Preparation of chemically bonded ceramic environmentally friendly permeable bricks

[0058] The preparation process is basically the same as in Example 1, except that in step (1), volcanic rock, the first solid filler and the first alkaline solid compound are added to the ball mill in a mass ratio of 40:40:1.

[0059] Example 4: Preparation of chemically bonded ceramic environmentally friendly permeable bricks

[0060] The preparation process is basically the same as in Example 1, except that in step (1), the mixture is ball-milled in a ball mill at a speed of 20 rpm for 30 minutes and then poured into a sieve for sieving.

[0061] Example 5: Preparation of chemically bonded ceramic environmentally friendly permeable bricks

[0062] The preparation process is basically the same as in Example 1, except that in step (3), the mass ratio of phosphate, second alkaline solid compound and second solid filler in the phosphate aqueous solution is 1:20:1.

[0063] Example 6: Preparation of chemically bonded ceramic environmentally friendly permeable bricks

[0064] The preparation process is basically the same as in Example 1, except that in step (3), the mass ratio of phosphate, second alkaline solid compound and second solid filler in the phosphate aqueous solution is 10:20:7.

[0065] Example 7: Preparation of chemically bonded ceramic environmentally friendly permeable bricks

[0066] The preparation process is basically the same as in Example 1, except that in step (4), the mass ratio of chemically bonded ceramic material to sieve residue mixture is 1:3.

[0067] Example 8: Preparation of chemically bonded ceramic environmentally friendly permeable bricks

[0068] The preparation process is basically the same as in Example 1, except that in step (4), the mass ratio of chemically bonded ceramic material to sieve residue mixture is 1:8.

[0069] Example 9: Preparation of chemically bonded ceramic environmentally friendly permeable bricks

[0070] The preparation process is basically the same as in Example 1, except that the first alkaline solid compound in step (1) and the second alkaline solid compound in step (3) are both aluminum oxide.

[0071] Example 10: Preparation of chemically bonded ceramic environmentally friendly permeable bricks

[0072] The preparation process is basically the same as in Example 1, except that the first alkaline solid compound in step (1) and the second alkaline solid compound in step (3) are both basic magnesium borate.

[0073] Example 11: Preparation of chemically bonded ceramic environmentally friendly permeable bricks

[0074] The preparation process is basically the same as in Example 1, except that the first alkaline solid compound in step (1) and the second alkaline solid compound in step (3) are both mixtures of basic magnesium borate and magnesium hydroxide; and the mass ratio of basic magnesium borate to magnesium hydroxide in the mixture is 1:1.

[0075] Example 12: Preparation of chemically bonded ceramic environmentally friendly permeable bricks

[0076] The preparation process is basically the same as in Example 1, except that the first solid filler in step (1) and the second solid filler in step (3) are both attapulgite clay with a mesh size of 800.

[0077] Example 13: Preparation of chemically bonded ceramic environmentally friendly permeable bricks

[0078] The preparation process is basically the same as in Example 1, except that the phosphate in step (3) is calcium dihydrogen phosphate.

[0079] Example 14: Preparation of chemically bonded ceramic environmentally friendly permeable bricks

[0080] The preparation process is basically the same as in Example 1, except that step (3) is: chemically bonded ceramic material is prepared by mixing phosphoric acid, phosphate aqueous solution, second alkaline solid compound and second solid filler; wherein the mass concentration of phosphate aqueous solution is 40%, the mass ratio of phosphate, second alkaline solid compound and second solid filler in phosphate aqueous solution is 5:20:3, the mass ratio of phosphate to phosphate in acid salt aqueous solution is 1:3, the phosphate is potassium dihydrogen phosphate, the second alkaline solid compound is magnesium hydroxide, and the second solid filler is 800 mesh kaolin.

[0081] Example 15: Preparation of chemically bonded ceramic environmentally friendly permeable bricks

[0082] The preparation process is basically the same as in Example 14, except that the mass ratio of phosphoric acid to phosphate in the phosphate aqueous solution is 1:1.

[0083] Example 16: Preparation of chemically bonded ceramic environmentally friendly permeable bricks

[0084] The preparation process is basically the same as in Example 14, except that the mass ratio of phosphoric acid to phosphate in the phosphate aqueous solution is 1:5.

[0085] Comparative Example 1: Preparation of Chemically Bonded Ceramic Environmentally Friendly Permeable Bricks

[0086] The preparation process is basically the same as in Example 1, except that step (1) is: volcanic rock and the first solid filler are added to a ball mill at a mass ratio of 25:25, and the mixture is ball-milled at a speed of 80 rpm for 30 minutes. The mixture is then poured into a sieve and sieved to obtain the residue mixture. The average particle size of the volcanic rock is 10 mm, and the first solid filler is 800 mesh kaolin.

[0087] Comparative Example 2: Preparation of Chemically Bonded Ceramic Environmentally Friendly Permeable Bricks

[0088] The preparation process is basically the same as in Example 1, except that step (1) is as follows: volcanic rock, the first solid filler and the first alkaline solid compound are added to a mixer in a mass ratio of 25:25:1. After stirring in the mixer at a speed of 80 rpm for 30 minutes, the mixture is poured into a sieve to remove the first alkaline solid compound that does not adhere to the surface of the volcanic rock and the first solid filler, and the residue mixture is obtained. The average particle size of the volcanic rock is 10 mm, the first solid filler is 800 mesh kaolin, and the first alkaline solid compound is magnesium hydroxide.

[0089] Comparative Example 3: Preparation of Chemically Bonded Ceramic Environmentally Friendly Permeable Bricks

[0090] The preparation process is basically the same as in Example 1, except that step (2) is: the sieve residue mixture obtained in step (1) is filled into a stainless steel mold with a mold height of 40 mm and a ventilation hole (the filling height of the sieve residue mixture in the mold is about 15 mm), without sprinkling water to wet it.

[0091] Comparative Example 4: Preparation of Chemically Bonded Ceramic Environmentally Friendly Permeable Bricks

[0092] The preparation process is basically the same as in Example 1, except that step (3) is: the chemically bonded ceramic material is prepared by mixing the phosphate aqueous solution and the second alkaline solid compound; wherein the mass concentration of the phosphate aqueous solution is 40%, the mass ratio of phosphate and the second alkaline solid compound in the phosphate aqueous solution is 5:20, the phosphate is potassium dihydrogen phosphate, and the second alkaline solid compound is magnesium hydroxide.

[0093] Test example:

[0094] The compressive strength, water retention and permeability coefficient of the chemically bonded ceramic environmentally friendly permeable bricks prepared in Examples 1-16 and Comparative Examples 1-4 were tested. The testing process was carried out in accordance with the provisions of JC / T945-2005. The test water used in the permeability coefficient test was distilled water. The test results are shown in Table 1.

[0095] Table 1

[0096]

[0097]

[0098] As shown in Table 1, compared with the chemically bonded ceramic environmentally friendly permeable bricks prepared in Comparative Examples 1-4, the chemically bonded ceramic environmentally friendly permeable bricks prepared in Examples 1-16 exhibit better compressive strength, water retention, and permeability. Specifically, the test results from Examples 1-3 and 5-8 indicate that controlling the mass ratio of volcanic rock, the first solid filler, and the first alkaline solid compound to (20-30):(20-30):1, the mass ratio of phosphate in the phosphate aqueous solution to the second alkaline solid chemical and the second solid filler to 5:20:(1-7), and the mass ratio of the chemically bonded ceramic material to the sieve residue mixture to 1:5 further enhances the compressive strength, water retention, and permeability of the chemically bonded ceramic environmentally friendly permeable bricks. The test results from Examples 1, 4 and Comparative Example 2 show that ball milling is more effective in adhering the first alkaline solid compound to the surface of the volcanic rock particles and the first solid filler particles. The adhesion effect is better when the ball milling speed is controlled at 50-100 rpm, which in turn helps to improve the compressive strength, water retention and permeability of the chemically bonded ceramic environmentally friendly permeable brick.

[0099] The test results from Examples 1 and 9-13 show that changing the specific types of the first alkaline solid compound, the second alkaline solid compound, the first solid filler, the second solid filler, and the phosphate affects the compressive strength, water retention, and permeability of the final chemically bonded ceramic permeable brick. The test results from Examples 1 and 14-16 show that further introducing phosphoric acid into the raw materials for preparing chemically bonded ceramic materials can further improve the adhesion of the resulting chemically bonded ceramic materials. Furthermore, when the mass ratio of phosphoric acid to phosphate in the phosphate aqueous solution is controlled at 1:(3-8), especially 1:5, the adhesion performance of the resulting chemically bonded ceramic material is optimal, and the compressive strength and permeability of the resulting environmentally friendly permeable brick are the best. The test results from Examples 1 and Comparative Example 1 show that ball milling to adhere a certain amount of the first alkaline solid compound to the surface of the main raw material volcanic rock and the first solid filler of the permeable brick can enhance the bonding effect, resulting in superior compressive strength of the final chemically bonded ceramic environmentally friendly permeable brick. The test results from Example 1 and Comparative Example 3 show that wetting the sieve residue mixture with water can increase the mass exchange rate between the first alkaline solid compound and the subsequently added phosphate in the sieve residue mixture, ultimately improving the bonding effect. The test results from Example 1 and Comparative Example 4 show that adding a certain amount of second solid filler to the raw materials during the preparation of chemically bonded ceramic materials can appropriately increase the viscosity of the obtained chemically bonded ceramic materials and improve their bonding effect.

[0100] It should be noted that the embodiments described above are only for explaining this application and do not constitute any limitation on this application. This application has been described with reference to typical embodiments, but it should be understood that the terms used therein are descriptive and explanatory terms, not limiting terms. Modifications can be made to this application within the scope of the claims, and revisions can be made to the invention without departing from the scope and spirit of this application. Although the application described herein relates to specific methods, materials, and embodiments, it does not mean that this application is limited to the specific examples disclosed herein; on the contrary, this application can be extended to all other methods and applications with the same function.

Claims

1. A method for preparing chemically bonded ceramic environmentally friendly permeable bricks, characterized in that, The method includes the following steps: S1, after mixing volcanic rock, the first solid filler and the first alkaline solid compound, the mixture is ball-milled and sieved to obtain a sieve residue mixture; S2, the sieved mixture is filled into a mold with ventilation holes and moistened with water; The filling height of the sieved residue mixture in the mold is 10~20mm; S3, chemically bonded ceramic material is prepared by mixing an aqueous phosphate solution, a second basic solid chemical, and a second solid filler; S4, chemically bonded ceramic material is sprayed into the mold and reacted with the sieve residue mixture; S5. Repeat steps S2-S4 until the mold is filled and then close the mold. S6. After the material in the mold has solidified, demolding, curing and polishing are carried out to obtain chemically bonded ceramic environmentally friendly permeable bricks. The first solid filler and the second solid filler are each independently selected from one or more of the following: kaolin, metakaolin, sepiolite, wollastonite, attapulgite, quartz sand, fly ash and montmorillonite. The first alkaline solid compound and the second alkaline solid compound are each independently selected from one or more of magnesium oxide, aluminum oxide, magnesium hydroxide, aluminum hydroxide and basic magnesium borate.

2. The method according to claim 1, characterized in that, In step S1, the mass ratio of the volcanic rock, the first solid filler, and the first alkaline solid compound is (5~40): (5~40): 1; and / or The mass ratio of phosphate, second alkaline solid chemical and second solid filler in the phosphate aqueous solution is (1~10):20:(1~7).

3. The method according to claim 1, characterized in that, In step S4, the mass ratio of the chemically bonded ceramic material to the sieve residue mixture is 1:(3~8).

4. The method according to any one of claims 1-3, characterized in that, The average particle size of the volcanic rock is 0.5~15mm.

5. The method according to any one of claims 1-3, characterized in that, In step S1, the ball mill rotates at a speed of 50-100 rpm for 20-40 minutes.

6. The method according to any one of claims 1-3, characterized in that, In step S2, the ratio of the amount of water sprayed to the mass of the sieve residue mixture is 1:(20~60).

7. The method according to any one of claims 1-3, characterized in that, In step S3, phosphoric acid is also added to the raw materials for preparing the chemically bonded ceramic material, and the mass ratio of phosphoric acid to phosphate in the phosphate aqueous solution is 1:(1~5).

8. A chemically bonded ceramic environmentally friendly permeable brick prepared by the method according to any one of claims 1-7.

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