Water-permeable foamed ceramic and preparation method and application thereof

Abstract

The application discloses water-permeable foamed ceramic and a preparation method and application thereof, and relates to the technical field of foamed ceramic preparation.The components of the foamed ceramic include the following raw materials: aggregate, alumina cement, foaming agent, powder, plant fiber, silane coupling agent, metal oxide and solvent.In the calcination process, the silane coupling agent is hydrolyzed, and the siloxane bond in the silane coupling agent tightly connects the plant fiber and the ceramic matrix together, the connection helps to form a solid ceramic structure, and meanwhile, the overall performance of the ceramic is improved.The silane coupling agent can improve the compatibility of the interface in the water-permeable foamed ceramic, strengthen the structure, and thus improve the stability and mechanical properties of the ceramic.

Description

Technical Field

[0001] This invention relates to the field of foamed ceramic preparation technology, and in particular to a permeable foamed ceramic, its preparation method and application. Background Technology

[0002] The development of foamed ceramic materials began in the 1970s. It is a porous material with high-temperature properties. Its pore size ranges from nanometer to micrometer, with a porosity between 20% and 95%, and an operating temperature range of room temperature to 1600℃. Foamed ceramics are lightweight, sound-insulating, heat-insulating, and corrosion-resistant, making them suitable for a wide range of applications.

[0003] However, in practical applications, there are frequent instances where the inherent properties of waterproof foamed ceramics do not match the requirements of the application scenarios. For example, in the construction of sponge cities, foamed ceramic materials not only need to possess excellent compressive strength, wear resistance, slip resistance, environmental friendliness, aesthetic appeal, ease of maintenance, and sound absorption and noise reduction, but also need to have certain water absorption, storage, infiltration, and purification functions to allow rainwater to migrate freely within the city. Therefore, it is necessary to develop foamed ceramic products with more functions to meet market demands.

[0004] In existing technologies, some foamed ceramics contain foaming agents and loss on ignition materials. Combining these methods increases the proportion of open-cell pores, resulting in advantages such as uniform pore size, a high proportion of open cells, and better sound absorption and water permeability. Therefore, it can improve the porosity of multi-purpose open-cell foamed ceramics. However, a drawback is the need for prolonged high-temperature sintering, leading to higher energy consumption and costs. Furthermore, existing foamed ceramics are often made by mixing the following raw materials in parts by weight: 10-20 parts block foamed ceramic, 20-30 parts coarse aggregate for foamed ceramic, 5-25 parts fine powder for foamed ceramic, 20-35 parts alumina cement, 1-5 parts gypsum, and 10-20 parts mineral additives. This results in uneven water permeability, low strength (typically less than 5 MPa), and brittleness.

[0005] Therefore, there is an urgent need to develop a new type of foam ceramic material to provide foam ceramics with good water permeability and high strength, while meeting the requirements of low-cost processing. Summary of the Invention

[0006] The first technical problem to be solved by this invention is:

[0007] A foamed ceramic is provided.

[0008] The second technical problem to be solved by this invention is:

[0009] A method for preparing the foamed ceramic is provided.

[0010] The third technical problem to be solved by this invention is:

[0011] Application of the foamed ceramics.

[0012] To solve the first technical problem, the technical solution adopted by the present invention is as follows:

[0013] A foamed ceramic, wherein the components of the foamed ceramic include the following raw materials:

[0014] aggregate;

[0015] Alumina cement;

[0016] Foaming agent;

[0017] Powder;

[0018] Plant fiber;

[0019] Silane coupling agents;

[0020] Metal oxides;

[0021] Solvent.

[0022] According to embodiments of the present invention, one of the technical solutions has at least one of the following advantages or beneficial effects:

[0023] The raw materials for the foamed ceramics of this invention include aggregates that provide structural support for the ceramic matrix, increasing the toughness and stability of the material, and alumina cement as a binding material to ensure that the ceramic can form a solid structure during the calcination process. The aggregates and alumina cement together construct the skeletal structure of the ceramic, enhancing the overall mechanical properties.

[0024] Powders are used to adjust the physical properties of ceramics and enhance specific functions. They can form a solid matrix together with alumina cement, and may also work synergistically with metal oxides to improve the adsorption performance of ceramics.

[0025] The foaming agent generates bubbles during calcination, forming a foamed structure. It works synergistically with alumina cement to ensure the formation of the foamed structure, and may also affect the water absorption properties of ceramics in conjunction with other raw materials.

[0026] Plant fibers are used to improve the toughness, biocompatibility, and environmental friendliness of ceramics. They work synergistically with alumina cement and silane coupling agents to enhance the adhesion between the fibers and the matrix, making the ceramics more durable.

[0027] Silane coupling agents can improve the adhesion between plant fibers and ceramic matrices, enhancing the structural stability of ceramics. They synergistically work with alumina cement and plant fibers to form a stable interface, improving the overall performance of the ceramic.

[0028] Metal oxides can improve the water absorption and retention capacity of ceramics, and also possess a certain ability to adsorb pollutants. In synergy with alumina cement and powders, they may work with plant fibers to influence the water absorption performance of ceramics and enhance their water purification function.

[0029] Furthermore, during calcination, the silane coupling agent undergoes hydrolysis, and the siloxane bonds in the silane coupling agent tightly connect the plant fibers and the ceramic matrix together. This connection helps to form a robust ceramic structure and improves the overall performance of the ceramic. In permeable foamed ceramics, silane coupling agents can improve interfacial compatibility, strengthen the structure, and thus improve the stability and mechanical properties of the ceramic.

[0030] According to one embodiment of the present invention, the foamed ceramic comprises the following raw materials in parts by weight:

[0031] Aggregate, 25-50 parts;

[0032] Alumina cement, 20-30 parts;

[0033] Foaming agent, 5-10 parts;

[0034] Powder, 15-20 parts;

[0035] Plant fiber, 10-15 parts;

[0036] Silane coupling agent, 3-8 parts;

[0037] Metal oxides, 2-6 parts;

[0038] Solvent, 100-150 parts.

[0039] According to one embodiment of the present invention, the alumina cement contains alumina, thereby improving the cement's resistance to sintering and ensuring that the cement can provide stable bonding at high temperatures.

[0040] According to one embodiment of the present invention, the aggregate includes coal gangue.

[0041] According to one embodiment of the present invention, the powder includes at least one of fly ash, coal gangue powder, polishing slag, and waste glass powder.

[0042] According to one embodiment of the present invention, the particle size of the coal gangue is less than 50 mm.

[0043] According to one embodiment of the present invention, the particle size of the powder is less than 300 μm.

[0044] According to one embodiment of the present invention, the plant fiber includes at least one selected from bamboo fiber, cotton fiber, and flax fiber. Bamboo fiber, with its lightweight and high strength properties, can be used to enhance the mechanical properties of ceramics. Flax fiber, with its good biocompatibility and tensile strength, can be used to improve the flexibility of ceramics. Cotton fiber, with its good water absorption, can improve the water absorption performance of ceramics.

[0045] According to one embodiment of the present invention, the silane coupling agent comprises 3-aminopropyltriethoxysilane. 3-Aminopropyltriethoxysilane has both amino and triethoxysilane functional groups, and this silane coupling agent establishes strong interfacial interactions between organic and inorganic materials. Specifically, 3-aminopropyltriethoxysilane improves the interfacial compatibility, structural stability, and mechanical properties of foamed ceramics, where plant fibers are typically organic materials, while the ceramic matrix is ​​primarily inorganic. The silane coupling agent, through its hydrophilic and lipophilic functional groups, can establish good interfacial compatibility between the inorganic and organic phases, thereby improving the adhesion between them; wherein, through the chemical bonding of the silane coupling agent with plant fibers, a network structure can be formed, effectively connecting the organic fibers to the ceramic matrix. This helps improve the overall structural stability of ceramics, preventing plant fibers from falling off and ceramics from breaking. In particular, because silane coupling agents can make plant fibers more firmly embedded in the ceramic matrix, this will help improve the mechanical properties of ceramics, such as tensile strength and compressive strength.

[0046] According to one embodiment of the present invention, the metal oxide includes at least one of iron oxide, aluminum oxide, and manganese oxide. Iron oxide, manganese oxide, and aluminum oxide have excellent hydrophilicity and can adsorb water molecules, thereby improving the water absorption of the ceramic. Their high surface area and porous structure also contribute to water storage, as water molecules can be adsorbed and stored on their surface and in their pores. The hydroxyl groups (-OH) on the surface of aluminum oxide can adsorb some pollutants, such as heavy metal ions, thereby improving the pollutant adsorption capacity of the ceramic. The oxide groups on the surface of manganese oxide have good redox properties and can undergo redox reactions with some organic and inorganic pollutants, thereby improving the pollutant adsorption and degradation capacity of the ceramic. The addition of these metal oxides, by adjusting the physicochemical properties of the ceramic, makes it exhibit superior performance in water absorption, water storage, and pollutant adsorption.

[0047] To solve the second technical problem, the technical solution adopted by the present invention is as follows:

[0048] A method for preparing the foamed ceramic includes the following steps:

[0049] Foamed ceramics are obtained by mixing aggregates, alumina cement, foaming agent, powder, plant fiber, silane coupling agent and metal oxide in water, followed by stirring and firing.

[0050] According to embodiments of the present invention, one of the technical solutions has at least one of the following advantages or beneficial effects:

[0051] This invention uses scrap materials as the main raw material and produces permeable foamed ceramics through a shorter high-temperature sintering process. Compared with existing technologies, it shortens the sintering time and reduces energy consumption. At the same time, it improves the material strength and the reliability of its permeability.

[0052] Another aspect of the present invention relates to the application of the foamed ceramic in urban water storage bricks. This includes the foamed ceramic described in the first aspect embodiment above. Since this application employs all the technical solutions of the aforementioned foamed ceramic, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments.

[0053] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. Detailed Implementation

[0054] The terms "preferred," "more preferably," etc., used in this invention refer to embodiments of the invention that provide certain beneficial effects under certain circumstances. However, other embodiments may also be preferred under the same or other circumstances. Furthermore, the description of one or more preferred embodiments does not imply that other embodiments are unavailable, nor is it intended to exclude other embodiments from the scope of this invention.

[0055] When a numerical range is disclosed herein, the range is considered continuous and includes the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Furthermore, when the range refers to integers, it includes every integer between the minimum and maximum values ​​of the range. Additionally, when multiple ranges are provided to describe a feature or characteristic, the ranges may be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges to which they are incorporated.

[0056] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of the present invention.

[0057] Unless otherwise specified, the reagents, methods and equipment used in this invention are all conventional reagents, methods and equipment in this technical field.

[0058] Example 1

[0059] A foamed ceramic, comprising the following raw materials in parts by weight:

[0060] Aggregate, 25 parts;

[0061] Alumina cement, 20 parts;

[0062] Foaming agent, 5 parts;

[0063] Powder, 15 portions;

[0064] Plant fiber, 10 parts;

[0065] Silane coupling agent, 3 parts;

[0066] Metal oxides, 2 parts;

[0067] Water, 100 portions.

[0068] The aggregate is coal gangue.

[0069] The powder consists of fly ash, coal gangue powder, polishing slag, and waste glass powder in a weight ratio of 1:0.5:3:1.

[0070] Among them, the particle size of coal gangue is less than 50mm.

[0071] The particle size of the powder is less than 300μm.

[0072] The plant fibers are bamboo fiber and flax fiber in a weight ratio of 2:1.

[0073] The silane coupling agent is 3-aminopropyltriethoxysilane.

[0074] The metal oxides are iron oxide, aluminum oxide, and manganese oxide in a weight ratio of 1:1:2.

[0075] The method for preparing the above-mentioned foamed ceramics includes the following steps:

[0076] S1 is a mixture of aggregates, alumina cement, foaming agent, powder, plant fiber, silane coupling agent and metal oxide in water;

[0077] S2 After mixing the product from step S1, spread it on the mold to a thickness of 200mm;

[0078] S3 The product from step S2 is placed in a kiln and fired at a temperature of 850°C for 40 minutes. Then, it is slowly cooled down and removed from the kiln to obtain foamed ceramics.

[0079] Example 2

[0080] A foamed ceramic, comprising the following raw materials in parts by weight:

[0081] Aggregate, 50 parts;

[0082] Alumina cement, 30 parts;

[0083] Foaming agent, 10 parts;

[0084] Powder, 20 portions;

[0085] Plant fiber, 15 parts;

[0086] Silane coupling agent, 8 parts;

[0087] Metal oxides, 6 parts;

[0088] Water, 100 portions.

[0089] The aggregate is coal gangue.

[0090] The powder consists of fly ash, coal gangue powder, polishing slag, and waste glass powder in a weight ratio of 1:0.5:3:1.

[0091] Among them, the particle size of coal gangue is less than 50mm.

[0092] The particle size of the powder is less than 300μm.

[0093] The plant fibers are bamboo fiber and flax fiber in a weight ratio of 2:1.

[0094] The silane coupling agent is 3-aminopropyltriethoxysilane.

[0095] The metal oxides are iron oxide, aluminum oxide, and manganese oxide in a weight ratio of 1:1:2.

[0096] The method for preparing the above-mentioned foamed ceramics includes the following steps:

[0097] S1 is a mixture of aggregates, alumina cement, foaming agent, powder, plant fiber, silane coupling agent and metal oxide in water;

[0098] S2 After mixing the product from step S1, spread it on the mold to a thickness of 200mm;

[0099] S3 The product from step S2 is placed in a kiln and fired at a temperature of 850°C for 40 minutes. Then, it is slowly cooled down and removed from the kiln to obtain foamed ceramics.

[0100] Example 3

[0101] A foamed ceramic, comprising the following raw materials in parts by weight:

[0102] Aggregate, 40 parts;

[0103] Alumina cement, 25 parts;

[0104] Foaming agent, 8 parts;

[0105] Powder, 18 portions;

[0106] Plant fiber, 12 parts;

[0107] Silane coupling agent, 6 parts;

[0108] Metal oxides, 4 parts;

[0109] Water, 100 portions.

[0110] The aggregate is coal gangue.

[0111] The powder consists of fly ash, coal gangue powder, polishing slag, and waste glass powder in a weight ratio of 1:0.5:3:1.

[0112] Among them, the particle size of coal gangue is less than 50mm.

[0113] The particle size of the powder is less than 300μm.

[0114] The plant fibers are bamboo fiber and flax fiber in a weight ratio of 2:1.

[0115] The silane coupling agent is 3-aminopropyltriethoxysilane.

[0116] The metal oxides are iron oxide, aluminum oxide, and manganese oxide in a weight ratio of 1:1:2.

[0117] The method for preparing the above-mentioned foamed ceramics includes the following steps:

[0118] S1 is a mixture of aggregates, alumina cement, foaming agent, powder, plant fiber, silane coupling agent and metal oxide in water;

[0119] S2 After mixing the product from step S1, spread it on the mold to a thickness of 200mm;

[0120] S3 The product from step S2 is placed in a kiln and fired at a temperature of 850°C for 40 minutes. Then, it is slowly cooled down and removed from the kiln to obtain foamed ceramics.

[0121] Example 4

[0122] A foamed ceramic, comprising the following raw materials in parts by weight:

[0123] Aggregate, 40 parts;

[0124] Alumina cement, 20 parts;

[0125] Foaming agent, 10 parts;

[0126] Powder, 15 portions;

[0127] Plant fiber, 10 parts;

[0128] Silane coupling agent, 3 parts;

[0129] Metal oxides, 2 parts;

[0130] Water, 100 portions.

[0131] The aggregate is coal gangue.

[0132] The powder consists of fly ash, coal gangue powder, polishing slag, and waste glass powder in a weight ratio of 1:0.5:3:1.

[0133] Among them, the particle size of coal gangue is less than 50mm.

[0134] The particle size of the powder is less than 300μm.

[0135] The plant fibers are bamboo fiber and flax fiber in a weight ratio of 2:1.

[0136] The silane coupling agent is 3-aminopropyltriethoxysilane.

[0137] The metal oxides are iron oxide, aluminum oxide, and manganese oxide in a weight ratio of 1:1:2.

[0138] The method for preparing the above-mentioned foamed ceramics includes the following steps:

[0139] S1 is a mixture of aggregates, alumina cement, foaming agent, powder, plant fiber, silane coupling agent and metal oxide in water;

[0140] S2 After mixing the product from step S1, spread it on the mold to a thickness of 200mm;

[0141] S3 The product from step S2 is placed in a kiln and fired at a temperature of 850°C for 40 minutes. Then, it is slowly cooled down and removed from the kiln to obtain foamed ceramics.

[0142] Example 5

[0143] A foamed ceramic, comprising the following raw materials in parts by weight:

[0144] Aggregate, 40 parts;

[0145] Alumina cement, 30 parts;

[0146] Foaming agent, 5 parts;

[0147] Powder, 20 portions;

[0148] Plant fiber, 10 parts;

[0149] Silane coupling agent, 3 parts;

[0150] Metal oxides, 2 parts;

[0151] Water, 100 portions.

[0152] The aggregate is coal gangue.

[0153] The powder consists of fly ash, coal gangue powder, polishing slag, and waste glass powder in a weight ratio of 1:0.5:3:1.

[0154] Among them, the particle size of coal gangue is less than 50mm.

[0155] The particle size of the powder is less than 300μm.

[0156] The plant fibers are bamboo fiber and flax fiber in a weight ratio of 2:1.

[0157] The silane coupling agent is 3-aminopropyltriethoxysilane.

[0158] The metal oxides are iron oxide, aluminum oxide, and manganese oxide in a weight ratio of 1:1:2.

[0159] The method for preparing the above-mentioned foamed ceramics includes the following steps:

[0160] S1 is a mixture of aggregates, alumina cement, foaming agent, powder, plant fiber, silane coupling agent and metal oxide in water;

[0161] S2 After mixing the product from step S1, spread it on the mold to a thickness of 200mm;

[0162] S3 The product from step S2 is placed in a kiln and fired at a temperature of 850°C for 40 minutes. Then, it is slowly cooled down and removed from the kiln to obtain foamed ceramics.

[0163] Example 6

[0164] A foamed ceramic, comprising the following raw materials in parts by weight:

[0165] Aggregate, 40 parts;

[0166] Alumina cement, 20 parts;

[0167] Foaming agent, 5 parts;

[0168] Powder, 20 portions;

[0169] Plant fiber, 10 parts;

[0170] Silane coupling agent, 8 parts;

[0171] Metal oxides, 6 parts;

[0172] Water, 100 portions.

[0173] The aggregate is coal gangue.

[0174] The powder consists of fly ash, coal gangue powder, polishing slag, and waste glass powder in a weight ratio of 1:0.5:3:1.

[0175] Among them, the particle size of coal gangue is less than 50mm.

[0176] The particle size of the powder is less than 300μm.

[0177] The plant fibers are bamboo fiber and flax fiber in a weight ratio of 2:1.

[0178] The silane coupling agent is 3-aminopropyltriethoxysilane.

[0179] The metal oxides are iron oxide, aluminum oxide, and manganese oxide in a weight ratio of 1:1:2.

[0180] The method for preparing the above-mentioned foamed ceramics includes the following steps:

[0181] S1 is a mixture of aggregates, alumina cement, foaming agent, powder, plant fiber, silane coupling agent and metal oxide in water;

[0182] S2 After mixing the product from step S1, spread it on the mold to a thickness of 200mm;

[0183] S3 The product from step S2 is placed in a kiln and fired at a temperature of 850°C for 40 minutes. Then, it is slowly cooled down and removed from the kiln to obtain foamed ceramics.

[0184] Example 7

[0185] A foamed ceramic, comprising the following raw materials in parts by weight:

[0186] Aggregate, 30 parts;

[0187] Alumina cement, 20 parts;

[0188] Foaming agent, 5 parts;

[0189] Powder, 15 portions;

[0190] Plant fiber, 10 parts;

[0191] Silane coupling agent, 3 parts;

[0192] Metal oxides, 2 parts;

[0193] Water, 100 portions.

[0194] The aggregate is coal gangue.

[0195] The powder consists of fly ash, coal gangue powder, polishing slag, and waste glass powder in a weight ratio of 1:0.5:3:1.

[0196] Among them, the particle size of coal gangue is less than 50mm.

[0197] The particle size of the powder is less than 300μm.

[0198] The plant fibers are bamboo fiber and flax fiber in a weight ratio of 2:1.

[0199] The silane coupling agent is 3-aminopropyltriethoxysilane.

[0200] The metal oxides are iron oxide, aluminum oxide, and manganese oxide in a weight ratio of 1:1:2.

[0201] The method for preparing the above-mentioned foamed ceramics includes the following steps:

[0202] S1 is a mixture of aggregates, alumina cement, foaming agent, powder, plant fiber, silane coupling agent and metal oxide in water;

[0203] S2 After mixing the product from step S1, spread it on the mold to a thickness of 200mm;

[0204] S3 The product from step S2 is placed in a kiln and fired at a temperature of 850°C for 40 minutes. Then, it is slowly cooled down and removed from the kiln to obtain foamed ceramics.

[0205] Example 8

[0206] A foamed ceramic, comprising the following raw materials in parts by weight:

[0207] Aggregate, 30 parts;

[0208] Alumina cement, 25 parts;

[0209] Foaming agent, 6 parts;

[0210] Powder, 15 portions;

[0211] Plant fiber, 10 parts;

[0212] Silane coupling agent, 3 parts;

[0213] Metal oxides, 2 parts;

[0214] Water, 100 portions.

[0215] The aggregate is coal gangue.

[0216] The powder consists of fly ash, coal gangue powder, polishing slag, and waste glass powder in a weight ratio of 1:0.5:3:1.

[0217] Among them, the particle size of coal gangue is less than 50mm.

[0218] The particle size of the powder is less than 300μm.

[0219] The plant fibers are bamboo fiber and flax fiber in a weight ratio of 2:1.

[0220] The silane coupling agent is 3-aminopropyltriethoxysilane.

[0221] The metal oxides are iron oxide, aluminum oxide, and manganese oxide in a weight ratio of 1:1:2.

[0222] The method for preparing the above-mentioned foamed ceramics includes the following steps:

[0223] S1 is a mixture of aggregates, alumina cement, foaming agent, powder, plant fiber, silane coupling agent and metal oxide in water;

[0224] S2 After mixing the product from step S1, spread it on the mold to a thickness of 200mm;

[0225] S3 The product from step S2 is placed in a kiln and fired at a temperature of 850°C for 40 minutes. Then, it is slowly cooled down and removed from the kiln to obtain foamed ceramics.

[0226] Example 9

[0227] A foamed ceramic, comprising the following raw materials in parts by weight:

[0228] Aggregate, 25 parts;

[0229] Alumina cement, 25 parts;

[0230] Foaming agent, 5 parts;

[0231] Powder, 20 portions;

[0232] Plant fiber, 10 parts;

[0233] Silane coupling agent, 3 parts;

[0234] Metal oxides, 2 parts;

[0235] Water, 100 portions.

[0236] The aggregate is coal gangue.

[0237] The powder consists of fly ash, coal gangue powder, polishing slag, and waste glass powder in a weight ratio of 1:0.5:3:1.

[0238] Among them, the particle size of coal gangue is less than 50mm.

[0239] The particle size of the powder is less than 300μm.

[0240] The plant fibers are bamboo fiber and flax fiber in a weight ratio of 2:1.

[0241] The silane coupling agent is 3-aminopropyltriethoxysilane.

[0242] The metal oxides are iron oxide, aluminum oxide, and manganese oxide in a weight ratio of 1:1:2.

[0243] The method for preparing the above-mentioned foamed ceramics includes the following steps:

[0244] S1 is a mixture of aggregates, alumina cement, foaming agent, powder, plant fiber, silane coupling agent and metal oxide in water;

[0245] S2 After mixing the product from step S1, spread it on the mold to a thickness of 200mm;

[0246] S3 The product from step S2 is placed in a kiln and fired at a temperature of 850°C for 40 minutes. Then, it is slowly cooled down and removed from the kiln to obtain foamed ceramics.

[0247] Example 10

[0248] A foamed ceramic, comprising the following raw materials in parts by weight:

[0249] Aggregate, 50 parts;

[0250] Alumina cement, 30 parts;

[0251] Foaming agent, 10 parts;

[0252] Powder, 20 portions;

[0253] Plant fiber, 12 parts;

[0254] Silane coupling agent, 6 parts;

[0255] Metal oxides, 4 parts;

[0256] Water, 100 portions.

[0257] The aggregate is coal gangue.

[0258] The powder consists of fly ash, coal gangue powder, polishing slag, and waste glass powder in a weight ratio of 1:0.5:3:1.

[0259] Among them, the particle size of coal gangue is less than 50mm.

[0260] The particle size of the powder is less than 300μm.

[0261] The plant fibers are bamboo fiber and flax fiber in a weight ratio of 2:1.

[0262] The silane coupling agent is 3-aminopropyltriethoxysilane.

[0263] The metal oxides are iron oxide, aluminum oxide, and manganese oxide in a weight ratio of 1:1:2.

[0264] The method for preparing the above-mentioned foamed ceramics includes the following steps:

[0265] S1 is a mixture of aggregates, alumina cement, foaming agent, powder, plant fiber, silane coupling agent and metal oxide in water;

[0266] S2 After mixing the product from step S1, spread it on the mold to a thickness of 200mm;

[0267] S3 The product from step S2 is placed in a kiln and fired at a temperature of 850°C for 40 minutes. Then, it is slowly cooled down and removed from the kiln to obtain foamed ceramics.

[0268] Example 11

[0269] A foamed ceramic, comprising the following raw materials in parts by weight:

[0270] Aggregate, 25 parts;

[0271] Alumina cement, 25 parts;

[0272] Foaming agent, 5 parts;

[0273] Powder, 18 portions;

[0274] Plant fiber, 10 parts;

[0275] Silane coupling agent, 3 parts;

[0276] Metal oxides, 2 parts;

[0277] Water, 100 portions.

[0278] The aggregate is coal gangue.

[0279] The powder consists of fly ash, coal gangue powder, polishing slag, and waste glass powder in a weight ratio of 1:0.5:3:1.

[0280] Among them, the particle size of coal gangue is less than 50mm.

[0281] The particle size of the powder is less than 300μm.

[0282] The plant fibers are bamboo fiber and flax fiber in a weight ratio of 2:1.

[0283] The silane coupling agent is 3-aminopropyltriethoxysilane.

[0284] The metal oxides are iron oxide, aluminum oxide, and manganese oxide in a weight ratio of 1:1:2.

[0285] The method for preparing the above-mentioned foamed ceramics includes the following steps:

[0286] S1 is a mixture of aggregates, alumina cement, foaming agent, powder, plant fiber, silane coupling agent and metal oxide in water;

[0287] S2 After mixing the product from step S1, spread it on the mold to a thickness of 200mm;

[0288] S3 The product from step S2 is placed in a kiln and fired at a temperature of 850°C for 40 minutes. Then, it is slowly cooled down and removed from the kiln to obtain foamed ceramics.

[0289] Example 12

[0290] A foamed ceramic, comprising the following raw materials in parts by weight:

[0291] Aggregate, 50 parts;

[0292] Alumina cement, 30 parts;

[0293] Foaming agent, 8 parts;

[0294] Powder, 18 portions;

[0295] Plant fiber, 10 parts;

[0296] Silane coupling agent, 3 parts;

[0297] Metal oxides, 2 parts;

[0298] Water, 100 portions.

[0299] The aggregate is coal gangue.

[0300] The powder consists of fly ash, coal gangue powder, polishing slag, and waste glass powder in a weight ratio of 1:0.5:3:1.

[0301] Among them, the particle size of coal gangue is less than 50mm.

[0302] The particle size of the powder is less than 300μm.

[0303] The plant fibers are bamboo fiber and flax fiber in a weight ratio of 2:1.

[0304] The silane coupling agent is 3-aminopropyltriethoxysilane.

[0305] The metal oxides are iron oxide, aluminum oxide, and manganese oxide in a weight ratio of 1:1:2.

[0306] The method for preparing the above-mentioned foamed ceramics includes the following steps:

[0307] S1 is a mixture of aggregates, alumina cement, foaming agent, powder, plant fiber, silane coupling agent and metal oxide in water;

[0308] S2 After mixing the product from step S1, spread it on the mold to a thickness of 200mm;

[0309] S3 The product from step S2 is placed in a kiln and fired at a temperature of 850°C for 40 minutes. Then, it is slowly cooled down and removed from the kiln to obtain foamed ceramics.

[0310] Performance testing:

[0311] The foamed ceramics prepared in Examples 1-12 were subjected to performance tests. The water absorption rate was tested according to GB / T3810.3 (vacuum method); the bulk density and compressive strength were tested according to GB / T5486; and the refractoriness was tested according to GB / T9978.8-2008. The test results are shown in Table 1.

[0312] Table 1

[0313]

[0314]

[0315] The above are merely embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A permeable foamed ceramic, characterized in that: The permeable foamed ceramic comprises the following raw materials in parts by weight: Aggregate, 25-50 parts; Alumina cement, 20-30 parts; Foaming agent, 5-10 parts; Powder, 15-20 parts; Plant fiber, 10-15 parts; Silane coupling agent, 3-8 parts; Metal oxides, 2-6 parts; Solvent, 100-150 parts; The powder includes at least one of fly ash, coal gangue powder, polishing slag, and waste glass powder; The plant fiber includes at least one of bamboo fiber, cotton fiber, and flax fiber; The silane coupling agent includes 3-aminopropyltriethoxysilane; The metal oxides include iron oxide, aluminum oxide, and manganese oxide; The permeable foamed ceramic is prepared by the following steps: Mix aggregates, alumina cement, foaming agent, powder, plant fiber, silane coupling agent and metal oxide in water, and then mix and fire to obtain permeable foamed ceramics; The firing temperature is 850 ℃ and the firing time is 40 minutes.

2. The permeable foamed ceramic according to claim 1, characterized in that: The aggregate includes coal gangue.

3. The permeable foamed ceramic according to claim 2, characterized in that: The coal gangue has a particle size of less than 50 mm.

4. The permeable foamed ceramic according to claim 1, characterized in that: The particle size of the powder is less than 300 μm.

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