Environment-friendly water purification ceramic product and preparation method thereof

Abstract

The invention relates to the field of water purification materials, and particularly discloses an environment-friendly water purification ceramic product and a preparation method thereof. The environment-friendly water purification ceramic product is prepared from the following raw materials in parts by weight: 72.5 to 100 parts of a light building material, 20 to 30 parts of a pore-foaming agent and 8 to 10 parts of clay, the light building material comprises 20-30 parts of coal gangue, 15-20 parts of fly ash, 30-40 parts of red mud and 7.5-10 parts of water purification sludge powder. The environment-friendly water purification ceramic product has the advantages that industrial waste is used as the raw material, resource exploitation is reduced, waste is turned into wealth, sustainable development is achieved, meanwhile, the environment-friendly water purification ceramic product has the advantages of being high in strength and toughness, and cracking caused by too hard water quality or too high water pressure is not likely to happen.

Description

Technical Field

[0001] The present application relates to the technical field of water purification materials, and more specifically, to an environmentally friendly water purification ceramic product and a preparation method thereof. Background Art

[0002] Water is an important substance that is indispensable for human life and production, and it is also an important natural resource that cannot be replaced. With the development of society and the improvement of living standards, people have higher and higher requirements for the quality of life. Clean and safe drinking water is the guarantee of people's quality of life. Obtaining clean and safe drinking water has become a hot topic worldwide. Water is the main carrier of various pathogens, and 80% of human diseases are related to water pollution. At present, water pollution is becoming more and more serious. Surface water such as rivers, lakes and groundwater in some areas are polluted to varying degrees. The water shortage problem has attracted widespread attention. The main pollutants in drinking water are soluble heavy metal ions, arsenic ions, trace organic pollutants, disinfection by-products, nitrates, nitrites, pathogens, viruses and pathogenic microorganisms. At present, the widely used water purification materials are mainly activated carbon, ceramic filter elements, molecular sieves, KDF and hollow fiber membranes.

[0003] With the rapid development of industrialization, industrial waste is increasing day by day, which has caused serious negative consequences such as land occupation and environmental pollution. However, industrial waste still contains a large number of valuable resources, such as coal gangue, blast furnace slag, phosphogypsum, fly ash, red mud, sludge, etc., which are all lightweight building materials and can also be used as sintering raw materials for ceramic products. It can not only reduce resource exploitation, protect vegetation, reduce energy consumption and carbon emissions in the processing process, achieve sustainable development, but also turn waste into treasure.

[0004] At present, the main raw material of ceramic water purification materials is diatomite, which has become one of the preferred materials for mainstream ceramic filter elements due to its high adsorption performance due to its unique biological nano-sized microstructure. Diatomite is composed of diatom remains, the main component of which is silicon dioxide (80-95% by mass), and the remaining components are mainly aluminum oxide. Diatomite has a large number of naturally ordered nano-microporous structures with pore sizes between 80 and 200nm, which gives diatomite excellent filtering and adsorption capabilities. However, ceramic filter elements made of sintered silicon dioxide will deform or even break when subjected to external forces, or when the water quality is too hard or the water pressure is too high, resulting in the production of debris in the filter element, affecting the filtering effect. Summary of the invention

[0005] In order to improve the mechanical strength of ceramic water purification materials and reduce the risk of deformation or breakage, the present application provides an environmentally friendly water purification ceramic product and a preparation method thereof.

[0006] In the first aspect, the present application provides an environmentally friendly water purification ceramic product, which adopts the following technical solution:

[0007] An environmentally friendly water-purifying ceramic product comprises the following raw materials in parts by weight: 72.5-100 parts of lightweight building materials, 20-30 parts of porogens and 8-10 parts of clay; the lightweight building materials comprise: 20-30 parts of coal gangue, 15-20 parts of fly ash, 30-40 parts of red mud and 7.5-10 parts of water-purifying sludge powder.

[0008] By adopting the above technical scheme, solid waste materials such as coal gangue, fly ash, red mud and water purification sludge powder that can be used as lightweight building materials are used together with clay and porogens as raw materials for ceramic products. Fly ash is the fly ash produced after the combustion of coal powder. It is a common solid waste. Its performance and resource utilization have attracted much attention. It contains silicon dioxide, aluminum oxide, etc., which can provide support for the structural form of ceramic products and increase the mechanical strength of ceramic products. Red mud is an industrial solid waste rich in iron oxide discharged after the production of alumina from bauxite. Its mineral components are mainly composed of two parts. The main one is the reaction or phase change of elements such as aluminum, silicon, iron, titanium and the added calcium, sodium, etc., such as sodalite, cancrystal, perovskite, calcite, etc. The other is the unreacted Dissolved or undissolved residual accessory minerals, such as quartz, muscovite, etc.; the main components of water purification sludge are a large amount of silt, impurities and coagulants added by water plants in the water source. Its main inorganic components are also silicon dioxide, aluminum oxide and ferric oxide. The organic matter it contains can provide the required energy for the firing process of ceramic products, and substances such as ferric oxide, calcium oxide and magnesium oxide can play a fluxing role, reduce the sintering temperature, and after calcination, it can form a good filter material with good chemical stability, light weight, good heat resistance, large specific surface area, and thermal shock resistance; the main components of coal gangue are aluminum oxide and silicon dioxide, and it also contains other elements and minerals, such as iron oxide, calcium oxide, magnesium oxide, etc. These components can improve the strength and other properties of ceramic products. Moreover, the raw materials used are all industrial waste. Using them as raw materials for ceramic products can not only reduce resource mining, but also turn waste into treasure and improve environmental protection.

[0009] Optionally, the preparation method of the water purification sludge powder is as follows: drying, grinding, and passing the water purification sludge through a 100-mesh sieve, placing it in a sodium citrate solution, stirring for 20-24 hours, filtering, washing, and drying to obtain pre-treated sludge powder;

[0010] The nanometer ferroferric oxide particles are dispersed in deionized water to prepare a solution with a concentration of 0.13-0.15 g / ml, and the nanometer silver particles and nanometer cellulose are added and stirred evenly to prepare a treatment solution, which is sprayed onto the pretreated sludge powder and dried at 60-80°C.

[0011] By adopting the above technical scheme, after the water purification sludge is dried, the internal structural water and other substances evaporate, so that the porosity and specific surface area of ​​the water purification sludge are increased, which is beneficial to the adsorption of pollutants in the water body. Moreover, after being modified by sodium citrate, sodium ions undergo a replacement reaction with cations such as calcium ions and magnesium ions with larger radius in the water purification sludge, and sodium ions are introduced into the water purification sludge, so that the spatial steric hindrance of the sludge powder is reduced, the internal diffusion rate is accelerated, and the ion exchange capacity is increased. In addition, the interaction between the sodium ions and the structural units is weak, and it can be peeled into thinner single crystals under the action of the solution, which increases the internal surface area of ​​the water purification sludge. Moreover, sodium citrate decomposes under high-temperature roasting to produce substances such as carbon dioxide. When the gaseous substances escape from the inside to the outside, the impact force generated continuously acts on the surface of the water purification sludge. The escape of carbon dioxide causes some holes to be generated inside the calcined water purification sludge, making its surface structure more loose, increasing the specific surface area, and also widening the original pore diameter, which is beneficial to the filtration efficiency of ceramic products and further improves its removal effect on suspended matter, microorganisms, etc. in water.

[0012] Nanosilver has strong antibacterial properties and can kill many types of pathogens, including viruses, fungi and bacteria. Ferroferric oxide also has strong antibacterial properties at higher concentrations, but both have a certain degree of agglomeration. Therefore, nanocellulose with high specific surface area and high hydrophilicity is used as the loading matrix. The functional groups on its surface can adsorb nanosilver particles and nanoferroferric oxide particles, and organize the mutual approach and agglomeration of nanoparticles through the steric hindrance effect. In addition, its high aspect ratio and strong hydrophilicity enable it to form a network structure in water, which also helps to evenly disperse the nanoparticles. Therefore, after spraying, evenly distributed antibacterial particles can be formed on the pretreated sludge powder, thereby improving the bactericidal property of ceramic products.

[0013] Optionally, the mass ratio of the nano-ferroferric oxide particles, the nano-silver particles and the nano-cellulose is 6.5-7.5:4-5:1;

[0014] The mass ratio of the treatment liquid to the pretreated sludge powder is 1:2.

[0015] By adopting the above technical scheme, the dosage of the above raw materials can make the nano-ferroferric oxide and nano-silver particles evenly distributed on the sludge powder under the dispersing effect of nano-cellulose, thereby obtaining better antibacterial and bactericidal effects.

[0016] Optionally, 10-15 parts by weight of silicon carbide fibers and 5-10 parts by weight of titanium carbide particles are further added to the ceramic product.

[0017] By adopting the above technical scheme, the addition of silicon carbide fibers can refine the grains of ceramic products, reduce porosity, and promote better sintering properties of ceramic products, thereby strengthening the bonding between grains. Cracks can only extend in ceramic products in the form of transgranular fracture, and the silicon carbide fibers and ceramic products peel off to form a new interface to consume crack propagation energy, thereby improving toughness and reducing brittleness. Titanium carbide particles are used as a reinforcing phase to obtain a dual strengthening effect of fiber and particles. Titanium carbide particles inhibit abnormal grain growth, thereby effectively improving the mechanical properties of ceramic products. When cracks propagate in ceramic products, transgranular fracture occurs when they encounter titanium carbide grains with high elastic modulus. The cracks consume more energy and improve the anti-cracking effect.

[0018] Optionally, the silicon carbide fiber is pretreated as follows:

[0019] The silicon carbide fiber is placed in a vacuum treatment at 1700-1750°C and 0.3-0.5Pa for 20-30 minutes to obtain a graphite layer-coated fiber;

[0020] The graphene-coated fiber is obtained by intercalating, oxidizing and reducing the graphite layer-coated fiber;

[0021] The silver nanowires and hydroxypropyl methylcellulose solution are uniformly mixed to obtain a treatment solution, the treatment solution is sprayed on the graphene-coated fibers, and the mixture is dried at 100-120° C. for 8-10 minutes. The mass ratio of the graphene-coated fibers to the silver nanowires and hydroxypropyl methylcellulose is 10:1-1.5:2.5-3.

[0022] By adopting the above technical scheme, the silicon carbide fiber is first heat-treated at a temperature higher than the melting point of silicon and under a certain vacuum pressure, so that the silicon carbide fiber undergoes high-temperature decomposition, silicon atoms are released, and a graphite layer is formed on the fiber surface. The graphite layer-coated fiber is then intercalated, oxidized, and reduced, and the graphite layer on the fiber surface is reduced to a graphene layer to obtain a graphene-coated fiber. Graphene has a strong bactericidal ability. It can not only penetrate the cell membrane of bacteria, causing the outflow of cell contents, but also form highly chemically active bonds with the carbon atoms on its surface. When bacteria come into contact with the graphene surface, this high chemical activity will react with the cell wall or cell membrane of the bacteria, causing the destruction and death of the bacteria. In addition, graphene has a broad-spectrum antibacterial potential against various bacteria, viruses, and fungi. Silicon fiber has good antibacterial ability; because the surface of silver nanowires usually contains a thin layer of PVP, the C=O group on PVP can form hydrogen bonds with the hydroxyl group on hydroxypropyl methylcellulose, thereby dispersing the silver nanowires and making them less likely to agglomerate. It can also increase the viscosity of the treatment liquid, making the adhesion strength between the silver nanowires and the graphene-coated fiber surface stronger. The silver nanowires can overlap with the graphene on the surface of the silicon carbide fiber. The graphene provides a flexible substrate for the silver nanowires to prevent the silver nanowires from breaking under the action of tension. At the same time, the synergistic effect of the silver nanowires and graphene makes the composite material more flexible and stable, thereby enhancing the improvement effect of the silicon carbide fiber on the toughness of ceramic products. In addition, the synergistic cooperation of the silver nanowires and the graphene layer can further enhance the bactericidal ability of ceramic products.

[0023] Optionally, the titanium carbide particles are pretreated by the following method:

[0024] The polyurethane foam is soaked in an alkali solution with a concentration of 13-15wt% at 50-55°C for 4-5h, dried, and then soaked in a polyvinyl alcohol solution with a concentration of 5-6wt% for 22-24h, and dried to obtain a pretreated foam;

[0025] Dispersing titanium carbide particles and zirconium oxide in deionized water to obtain a suspension with a solid content of 65-70%, adding a polyacrylate ammonium solution with a concentration of 30-35wt%, adjusting the pH to 9, adding silica sol and polyamide wax, and ball milling for 20-24h to obtain a slurry, wherein the mass ratio of titanium carbide particles to zirconium oxide is 1:0.1-0.2, and the mass ratio of titanium carbide particles, ammonium polyacrylate, silica sol and polyamide wax is 1:0.02-0.04:0.02-0.04:0.01-0.02;

[0026] The pretreated foam is immersed in the slurry for 20-24 hours, and after squeezing out the excess slurry, it is dried at room temperature for 22-24 hours, and then dried at 100-120° C. for 4-6 hours.

[0027] By adopting the above technical scheme, after the polyurethane foam is treated with alkali solution, the porosity of the polyurethane foam can be increased, the roughness of its surface can be improved, and the slurry hanging ability of the polyurethane foam can be improved. Then, polyvinyl alcohol is used to improve the wettability of the foam, improve the adhesion between the polyurethane foam and the slurry, and increase the slurry hanging rate; then, silica sol is used as a high-temperature binder to increase the adhesion of the slurry to titanium carbide particles and zirconium oxide, and carboxymethyl cellulose makes the slurry have a certain fluidity and thixotropy. The fluidity of the slurry ensures that during the impregnation process, the slurry effectively penetrates into the pre-treated foam and is evenly coated in the gaps of the foam. Moreover, when the excess slurry is squeezed out, the slurry is reduced under the action of shear force. The viscosity of the material is increased, the fluidity of the slurry is improved, and the slurry attached to the pretreatment foam is easily solidified and shaped, and the slurry will not be blocked by the pretreatment foam due to the flow of the slurry, which will affect the sintering of the titanium carbide particles; zirconium oxide is added to the ceramic products using the load of the pretreatment foam, which can play a role in grain refinement and hinder the growth of crystal grains. At the same time, it also plays a role in phase change toughening and microcrack toughening, which can improve the toughness of ceramic products and improve the fracture toughness and bending strength of ceramic products; therefore, the slurry containing titanium carbide particles and zirconium oxide is impregnated with polyurethane foam, which can improve the porosity and specific surface area of ​​the ceramic products after sintering, increase the filtration efficiency, and improve the filtration flow rate.

[0028] Optionally, the porogen is selected from at least one of coal powder, limestone and dolomite.

[0029] By adopting the above technical solution, the main component of coal powder is carbon, which burns out at 300-600℃, thereby releasing a large amount of gas to form pores in ceramic products. The main component of limestone is calcium carbonate, and the main components of dolomite are magnesium carbonate and calcium carbonate. They decompose during the firing process and release a large amount of gas to form pores.

[0030] In a second aspect, the present application provides a method for preparing an environmentally friendly water-purifying ceramic product, using the following technical solution:

[0031] A method for preparing an environmentally friendly water-purifying ceramic product comprises the following steps:

[0032] The red mud, fly ash, water purification sludge powder and coal gangue are mixed with the porogen and clay, and then the mixture is evenly mixed. The mixture is sieved after ball milling and pressed into a shape to obtain a body. The body is then dried and sintered, cooled to room temperature and discharged to obtain an environmentally friendly water purification ceramic product.

[0033] By adopting the above technical solution, red mud, fly ash and other raw materials are mixed and then ball-milled and sieved to refine the raw materials, and then pressed into shape, dried and sintered. This makes it have extremely high mechanical strength and compressive strength, can work stably under high-pressure conditions, is not easily deformed or damaged, and can effectively intercept tiny particles, with excellent durability and service life.

[0034] Optionally, the embryo body is subjected to the following treatments before sintering:

[0035] The embryos are soaked in hydrochloric acid for 20-24 hours, and then washed to neutrality to obtain pretreated embryos;

[0036] The iron oxide powder is mixed evenly with low melting point glass powder, epoxy resin emulsion and curing agent to prepare a spraying liquid, wherein the mass ratio of the iron oxide, low melting point glass powder, epoxy resin emulsion and curing agent is 1:0.2-0.4:1-1.2:0.01-0.012;

[0037] The spraying liquid is uniformly sprayed on the pretreated embryo body, and dried at 80-100° C., and the spraying and drying are repeated 4 times.

[0038] In order to improve the filtering effect of ceramic filter media, the filter media surface is treated with iron nitrate or the like. Repeated precipitation method or heating evaporation method is often used to form an iron oxide film through thermal volatilization, which is coated on the filter media surface. Because the mutual adhesion between the iron oxide film and the filter media carrier is weak at low temperatures, the iron oxide coating and the filter media coating are not firmly bonded and are easily deliquesced in the air. By adopting the above technical scheme, firstly, the adhesion effect of the epoxy resin emulsion can adhere the low-melting-point glass powder and the iron oxide powder to the embryo. As the sintering progresses, the temperature continues to rise, and the bonding layer formed by the epoxy resin may lose its adhesion due to the high temperature, but the low-melting-point glass powder will melt as the temperature rises, thereby firmly adhering the iron oxide film to the embryo. Iron oxide can produce free radicals with strong oxidizing properties under light, and these free radicals can destroy the cell structure of bacteria. Therefore, the iron oxide film has a high sterilization rate under the photocatalysis of visible light. Moreover, after high-temperature sintering, the iron oxide appears as fine particles attached to the surface of the ceramic product to form a porous structure, thereby increasing the specific surface area, which is conducive to the large-scale adsorption of ions and impurities in the water, improving the filtration accuracy and efficiency, and at the same time enhancing its durability, so that it can operate stably for a long time under harsh water conditions. In addition, due to the presence of the iron oxide film, the ceramic product is easier to clean and restore the filtration performance.

[0039] Optionally, the mass ratio of the spraying liquid to the pretreated embryo body is 0.2-0.3:1.

[0040] By adopting the above technical solution, if the spraying liquid containing iron oxide and low-melting point glass powder is excessive, it will affect the filtering effect of the filtering product. If the spraying amount is too small, it may affect the bonding strength of the iron oxide film on the embryo.

[0041] Optionally, during the sintering, the steel is first preheated at 360-500° C. for 10-30 min, then heated to 1050-1100° C. and calcined for 20-30 min.

[0042] In summary, this application has the following beneficial effects:

[0043] 1. Since this application uses fly ash, coal gangue, red mud and water purification sludge powder as basic materials, and then uses clay to increase the density of the raw materials, uses porogens to increase porosity and improve filtration speed, coal gangue and the like are used as lightweight building materials. Through mixed sintering in a specific ratio, it can not only turn waste into treasure, reduce resource exploitation, and improve environmental protection performance, but also obtain ceramic products with high compressive strength, high flexural strength, good toughness and not easy to break.

[0044] 2. In the present application, sodium citrate, ferroferric oxide and nano-silver particles are preferably used to pre-treat the water purification sludge, which can increase the sintering porosity of the water purification sludge, and at the same time make it have better bactericidal ability, which can enhance the filtering effect of ceramic products.

[0045] 3. In the present application, it is preferred to add silicon carbide fibers and titanium carbide particles to ceramic products, and pre-treat the silicon carbide fibers with silver nanowires, etc., and pre-treat the titanium carbide particles with zirconium oxide, ammonium polyacrylate, etc., which can increase the toughness of the silicon carbide fibers and enhance the sintering porosity of the titanium carbide particles, thereby enhancing the toughness of the ceramic products, increasing the compressive resistance, and increasing the filtration speed, while the bactericidal power is further improved. DETAILED DESCRIPTION

[0046] The following examples further illustrate the present application in detail.

[0047] Preparation Example 1-4 of Water Purification Sludge Powder

[0048] Preparation Example 1: (1) The water treatment sludge was dried at 110° C. for 24 h, then ground through a 100-mesh sieve, placed in a 0.5 mol / l sodium citrate solution, stirred for 24 h, filtered, washed with deionized water, and dried at 110° C. for 10 h to obtain pretreated sludge powder. The water treatment sludge was selected from a water treatment plant in Beijing;

[0049] (2) Disperse 15 g of nano-ferroferric oxide particles into 100 ml of deionized water to prepare a solution with a concentration of 15 g / ml, add 10 g of nano-silver particles and 2 g of nano-cellulose, stir evenly to prepare a treatment solution, spray the treatment solution onto the pretreated sludge powder, and dry at 80°C for 10 h. The mass ratio of the treatment solution to the pretreated sludge powder is 1:2.

[0050] Preparation Example 2: (1) The water treatment sludge was dried at 110° C. for 24 h, then ground through a 100-mesh sieve, placed in a sodium citrate solution with a concentration of 0.5 mol / 1, stirred for 20 h, filtered, washed with deionized water, and dried at 110° C. for 10 h to obtain pretreated sludge powder. The water treatment sludge was selected from a water treatment plant in Beijing;

[0051] (2) Disperse 13 g of nano-ferroferric oxide particles into 100 ml of deionized water to prepare a solution with a concentration of 15 g / ml, add 8 g of nano-silver particles and 2 g of nano-cellulose, stir evenly to prepare a treatment solution, spray the treatment solution onto the pretreated sludge powder, and dry at 60°C for 12 h. The mass ratio of the treatment solution to the pretreated sludge powder is 1:2.

[0052] Preparation Example 3: The difference from Preparation Example 1 is that nano-ferroferric oxide is not added, and 10 g of nano-silver particles and 2 g of nano-cellulose are stirred evenly to prepare a treatment solution.

[0053] Preparation Example 4: The difference from Preparation Example 1 is that no nano-silver particles and nano-cellulose are added, 15 g of nano-ferroferric oxide particles are dispersed in 100 ml of deionized water, and stirred evenly to prepare a treatment solution.

[0054] Example

[0055] In the embodiment, all raw materials are commercially available materials, red mud is selected from Henan Jinrun New Materials, item number JR1568, fly ash is selected from Lingshou County Shengyun Mineral Products, item number 001, coal gangue is selected from Henan Jinrun New Materials, item number JR168518, clay is selected from Lingshou County Shunze Mineral Products Processing Plant, item number 325, coal powder is selected from Lingshou County Jiahao Mineral Powder, item number 0212, titanium carbide particles are selected from Beijing Jinyuan New Materials Technology Co., Ltd., item number JY1027, silicon carbide fiber is selected from Qinhuangdao Yinuogao New material development, model SFC, diameter 0.1-0.6μm, length 50-100μm, ammonium polyacrylate is selected from Zhengzhou Taixin Chemical Products, model 7102, polyamide wax is selected from Dongguan Yangting New Materials, item number HD-3400, silica sol, epoxy resin emulsion is selected from Qingdao Wanjiahuixin Surface Materials Technology, model S-990, curing agent is selected from Hubei Huda Asset Management, model HD-MG, low melting point glass powder is selected from Hebei Zhuofei Mineral Products Co., Ltd., model ZF88.

[0056] Example 1: An environmentally friendly water purification ceramic product comprises the following raw materials: 100g of lightweight building materials, 30g of pore-forming agent and 10g of clay, wherein the lightweight building materials comprise: 30g of coal gangue, 20g of fly ash, 40g of red mud, and 10g of water purification sludge powder, the water purification sludge powder is prepared according to Preparation Example 1, and the pore-forming agent is coal powder.

[0057] The preparation method of the above-mentioned environmentally friendly water purification ceramic product comprises the following steps:

[0058] Red mud, fly ash, water purification sludge powder and coal gangue are mixed and evenly mixed with porogen and clay. After dry ball milling for 4 hours, the mixture is passed through a 180-mesh sieve and pressed into shape to obtain a blank. The blank is dried and sintered, cooled to room temperature, and discharged to obtain an environmentally friendly water purification ceramic product. The pressing stress is 30 MPa, and the sintering process is: preheating at 500°C for 10 minutes, then heating to 1100°C and sintering for 20 minutes.

[0059] Example 2: An environmentally friendly water purification ceramic product comprises the following raw materials: 72.5 g of lightweight building materials, 20 g of pore-forming agent and 8 g of clay, wherein the lightweight building materials comprise: 20 g of coal gangue, 15 g of fly ash, 30 g of red mud, and 7.5 g of water purification sludge powder, the water purification sludge powder is prepared according to Preparation Example 2, and the pore-forming agent is coal powder.

[0060] The preparation method of the above-mentioned environmentally friendly water purification ceramic product comprises the following steps:

[0061] Red mud, fly ash, water purification sludge powder and coal gangue are mixed and evenly mixed with porogen and clay. After dry ball milling for 4 hours, the mixture is sieved through a 180-mesh sieve and pressed into shape to obtain a blank. The blank is dried and sintered, cooled to room temperature, and discharged to obtain an environmentally friendly water purification ceramic product. The pressing stress is 25 MPa, and the sintering process is: preheat at 360°C for 30 minutes, then heat to 1050°C, and sinter for 30 minutes.

[0062] Example 3: An environmentally friendly water purification ceramic product comprises the following raw materials: 86.5 g of lightweight building materials, 25 g of porogen and 9 g of clay, wherein the lightweight building materials comprise: 25 g of coal gangue, 18 g of fly ash, 35 g of red mud, 8.5 g of water purification sludge powder, the water purification sludge powder is prepared according to Preparation Example 1, and the porogen is coal powder.

[0063] The preparation method of the above-mentioned environmentally friendly water purification ceramic product comprises the following steps:

[0064] Red mud, fly ash, water purification sludge powder and coal gangue are mixed and evenly mixed with porogen and clay. After dry ball milling for 4 hours, the mixture is passed through a 180-mesh sieve and pressed into shape to obtain a blank. The blank is dried and sintered, cooled to room temperature, and discharged to obtain an environmentally friendly water purification ceramic product. The pressing stress is 28 MPa, and the sintering process is: preheat at 400°C for 20 minutes, then heat to 1100°C, and sinter for 20 minutes.

[0065] Example 4: An environmentally friendly water purification ceramic product, which differs from Example 1 in that the water purification sludge powder is made according to Preparation Example 3.

[0066] Example 5: An environmentally friendly water purification ceramic product, which differs from Example 1 in that the water purification sludge powder is made according to Preparation Example 4.

[0067] Example 6: An environmentally friendly water purification ceramic product, which differs from Example 1 in that 10g of silicon carbide fiber and 5g of titanium carbide particles are also added to the raw materials of the ceramic product; the preparation method of the above ceramic product is as follows: red mud, fly ash, water purification sludge powder and coal gangue are mixed and then mixed evenly with porogen and clay, dry ball milled for 4 hours, sieved through a 180-mesh sieve, silicon carbide fiber and silicon carbide particles are added, mixed evenly and pressed into shape to obtain a embryo, dried and then sintered, cooled to room temperature, and discharged to obtain an environmentally friendly water purification ceramic product, the pressing stress is 30MPa, and the sintering process is: preheating at 500°C for 10min, then heating to 1100°C and sintering for 20min.

[0068] Example 7: An environmentally friendly water purification ceramic product, which differs from Example 1 in that 15g of silicon carbide fiber and 10g of titanium carbide particles are also added to the raw materials of the ceramic product; the preparation method of the above ceramic product is as follows: red mud, fly ash, water purification sludge powder and coal gangue are mixed and then mixed evenly with porogen and clay, dry ball milled for 4 hours, sieved through a 180-mesh sieve, silicon carbide fiber and silicon carbide particles are added, mixed evenly and pressed into shape to obtain a embryo, which is then dried and sintered, cooled to room temperature, and discharged to obtain an environmentally friendly water purification ceramic product. The pressing stress is 30MPa, and the sintering process is as follows: preheat at 500°C for 10min, then heat to 1100°C, and sinter for 20min.

[0069] Example 8: An environmentally friendly water purification ceramic product, which differs from Example 7 in that an equal amount of silicon carbide fibers is used to replace titanium carbide particles.

[0070] Example 9: An environmentally friendly water purification ceramic product, which differs from Example 7 in that silicon carbide fiber is not added.

[0071] Example 10: An environmentally friendly water purification ceramic product, which is different from Example 7 in that the silicon carbide fiber is pretreated as follows: ① The silicon carbide fiber is placed in a muffle furnace, heated to 500°C, kept warm for 12 hours, immersed in a nitric acid solution for 12 hours, dried at 80°C for 6 hours, and then placed in a vacuum treatment at 1750°C and 0.3Pa for 30 minutes to obtain a graphite layer coated fiber; ② The graphite layer coated fiber is intercalated, oxidized, and reduced to obtain a graphene coated fiber. The specific method is: the graphite coated fiber, concentrated sulfuric acid and potassium permanganate are mixed in a mass ratio of 1:20:3, heated to 30°C, stirred for 3 hours, deionized water is added, and stirring is continued for 3 hours, and then a mass fraction of 1 is added. 0% hydrogen peroxide solution until the color changes to bright yellow, filter, wash alternately with deionized water and 2% dilute hydrochloric acid solution until the pH is close to neutral, dry at 80°C to obtain graphite oxide coated fibers, then disperse them in deionized water, ultrasonicate for 3h, add hydrazine hydrate, the mass ratio of hydrazine hydrate to graphite oxide coated fibers is 1:1, stir and reflux at 80°C for 24h, filter, wash with deionized water, and dry at 100°C; ③ Mix 1.5g of silver nanowires with a solution formed by 3g of hydroxypropyl methylcellulose and 100g of deionized water to obtain a treatment solution, spray the treatment solution evenly on 10g of graphene coated fibers, and dry at 120°C for 8min.

[0072] Example 11: An environmentally friendly water purification ceramic product, which is different from Example 7 in that the silicon carbide fiber is pretreated as follows: ① The silicon carbide fiber is placed in a muffle furnace, heated to 500°C, kept warm for 12 hours, immersed in a nitric acid solution for 12 hours, dried at 80°C for 6 hours, and then placed at 1700°C and 0.5Pa for vacuum treatment for 20 minutes to obtain a graphite layer coated fiber; ② The graphite layer coated fiber is intercalated, oxidized, and reduced to obtain a graphene coated fiber. The specific method is: the graphite coated fiber, concentrated sulfuric acid and potassium permanganate are mixed in a mass ratio of 1:20:3, heated to 30°C, stirred for 3 hours, deionized water is added, and stirring is continued for 3 hours, and then a mass fraction of 10 % hydrogen peroxide solution until the color changes to bright yellow, filter, wash alternately with deionized water and 2% dilute hydrochloric acid solution until the pH is close to neutral, dry at 80°C to obtain graphite oxide coated fibers, then disperse in deionized water, ultrasonicate for 3h, add hydrazine hydrate, the mass ratio of hydrazine hydrate to graphite oxide coated fibers is 1:1, stir and reflux at 80°C for 24h, filter, wash with deionized water, and dry at 100°C; ③ Mix 1g of silver nanowires with a solution formed by 2.5g of hydroxypropyl methylcellulose and 100g of deionized water to obtain a treatment solution, spray the treatment solution evenly on 10g of graphene coated fibers, and dry at 100°C for 10min.

[0073] Example 12: An environmentally friendly water purification ceramic product, which differs from Example 11 in that vacuum treatment, intercalation, oxidation and reduction are not performed during the pretreatment of silicon carbide fibers. The specific method is as follows: 1 g of silver nanowires is evenly mixed with a solution formed by 2.5 g of hydroxypropyl methylcellulose and 100 g of deionized water to obtain a treatment liquid, the treatment liquid is evenly sprayed on 10 g of silicon carbide fibers, and dried at 100°C for 10 minutes.

[0074] Example 13: An environmentally friendly water purification ceramic product, which differs from Example 11 in that, when pretreating the silicon carbide fiber, the graphite layer coated fiber is not intercalated, oxidized and reduced, and the treatment liquid is directly sprayed on the graphite coated fiber. The specific method is as follows: ① Place the silicon carbide fiber in a muffle furnace, heat it to 500°C, keep it warm for 12 hours, soak it in a nitric acid solution for 12 hours, dry it at 80°C for 6 hours, and then place it at 1700°C and 0.5Pa for vacuum treatment for 20 minutes to obtain the graphite layer coated fiber; ② Mix 1g of silver nanowires with a solution formed by 2.5g of hydroxypropyl methylcellulose and 100g of deionized water to obtain a treatment liquid, spray the treatment liquid evenly on 10g of graphite coated fiber, and dry it at 100°C for 10 minutes.

[0075] Example 14: An environmentally friendly water purification ceramic product, which differs from Example 11 in that, when pretreating the silicon carbide fibers, a treatment solution containing silver nanowires is not sprayed on the graphene-coated fibers.

[0076] Example 15: An environmentally friendly water purification ceramic product, which is different from Example 11 in that the titanium carbide particles are pretreated as follows: ① The polyurethane foam with a size of 30mm×30mm×20mm and a specification of 15PPi is soaked in a sodium hydroxide solution with a concentration of 15wt% at 50°C for 5h, dried, and then soaked in a polyvinyl alcohol solution with a concentration of 5wt% for 24h, dried, to obtain a pretreated foam; ② 30g of titanium carbide particles and 6g of zirconium oxide are dispersed in deionized water A suspension with a solid content of 70% is prepared, a polyacrylate ammonium solution with a concentration of 35wt% is added, the pH is adjusted to 9 with 1mol / l ammonia water, silica sol and polyamide wax are added, and ball milling is carried out for 24 hours to prepare a slurry, the mass ratio of titanium carbide particles, ammonium polyacrylate, silica sol and polyamide wax is 1:0.04:0.04:0.02; ③ The pretreated foam is immersed in the slurry for 24 hours, the excess slurry is squeezed out and dried at room temperature for 24 hours, and then dried at 100°C for 6 hours.

[0077] Example 16: An environmentally friendly water purification ceramic product, which is different from Example 11 in that the titanium carbide particles are pretreated as follows: ① The polyurethane foam with a size of 30mm×30mm×20mm and a specification of 15PPi is soaked in a sodium hydroxide solution with a concentration of 13wt% at 55°C for 4h, dried, and then soaked in a polyvinyl alcohol solution with a concentration of 6wt% for 22h, dried, to obtain a pretreated foam; ② 30g of titanium carbide particles and 3g of zirconium oxide are dispersed in deionized water A suspension with a solid content of 65% is prepared, a polyacrylate ammonium solution with a concentration of 30wt% is added, the pH is adjusted to 9 with 1 mol / 1 ammonia water, silica sol and polyamide wax are added, and ball milling is carried out for 20 hours to prepare a slurry, the mass ratio of titanium carbide particles, ammonium polyacrylate, silica sol and polyamide wax is 1:0.02:0.02:0.01; ③ The pretreated foam is immersed in the slurry for 24 hours, the excess slurry is squeezed out and dried at room temperature for 20 hours, and then dried at 120°C for 4 hours.

[0078] Example 17: An environmentally friendly water purification ceramic product, which differs from Example 16 in that zirconium oxide is not added in the titanium carbide particle pretreatment method.

[0079] Example 18: An environmentally friendly water purification ceramic product. The difference from Example 16 is that polyurethane foam is not used in the titanium carbide particle pretreatment method. The specific method is as follows: 30g of titanium carbide particles and 3g of zirconium oxide are mixed evenly.

[0080] Example 19: An environmentally friendly water purification ceramic product, which is different from Example 16 in that, in preparing the embryo body, the embryo body is subjected to the following pretreatment:

[0081] The embryos were immersed in 0.1 mol / l hydrochloric acid for 24 hours, then washed with water until neutral, and dried at 120° C. to obtain pretreated embryos;

[0082] 10 g of iron oxide powder, 4 g of low melting point glass powder, 1.2 g of epoxy resin emulsion, and 0.012 g of curing agent were mixed evenly to prepare a spraying liquid;

[0083] The spraying liquid was evenly sprayed on the pretreated embryo body and dried at 100°C for 24 hours. The mass ratio of the spraying liquid to the pretreated embryo body was 0.2:1. The spraying and drying were repeated 4 times.

[0084] Example 20: An environmentally friendly water purification ceramic product, which is different from Example 16 in that, in preparing the embryo body, the embryo body is subjected to the following pretreatment:

[0085] The embryos were immersed in 0.1 mol / l hydrochloric acid for 20 hours, then washed with water until neutral, and dried at 120° C. to obtain pretreated embryos;

[0086] 10g of iron oxide powder, 2g of low melting point glass powder, 1g of epoxy resin emulsion and 0.01g of curing agent were mixed evenly to prepare a spraying liquid;

[0087] The spraying liquid was evenly sprayed on the pretreated embryo body and dried at 80°C for 24 hours. The mass ratio of the spraying liquid to the pretreated embryo body was 0.3:1. The spraying and drying were repeated 4 times.

[0088] Example 21: An environmentally friendly water purification ceramic product, which differs from Example 20 in that no low-melting point glass powder is added.

[0089] Example 22: An environmentally friendly water purification ceramic product, which differs from Example 20 in that an equal amount of deionized water is used to replace the epoxy resin emulsion.

[0090] Example 23: An environmentally friendly water purification ceramic product, which differs from Example 20 in that the spraying is not repeated, and the spraying liquid is sprayed only once on the pretreated embryo.

[0091] Example 24: An environmentally friendly water purification ceramic product, which is different from Example 20 in that the embryo body is pretreated as follows:

[0092] The embryo was immersed in a 2 mol / l ferric nitrate solution, the pH was adjusted to 7, and calcined at 650°C for 3 h.

[0093] Comparative Example

[0094] Comparative Example 1: An environmentally friendly water purification ceramic product, which differs from Example 1 in that an equal amount of red mud is used to replace water purification sludge powder.

[0095] Comparative Example 2: An environmentally friendly water purification ceramic product, which differs from Example 1 in that an equal amount of fly ash is used to replace red mud.

[0096] Performance testing

[0097] Ceramic products were prepared according to the methods in the examples and comparative examples, and the performance of the ceramic products was tested according to the following methods. The test results are recorded in Table 1.

[0098] 1. Crushing strength: Tested in accordance with GB / T1964-2023 "Test method for room temperature compressive strength of porous ceramics".

[0099] 2. Bending strength: Test in accordance with GB / T4741-1999 “Test method for flexural strength of ceramic materials”.

[0100] 3. Filtration speed and colony count: Rinse each ceramic product with municipal water for 30 minutes, dry it naturally, and then select the water body of Ningbo Sanjiangkou as natural water. Filter the natural water for 10 minutes each, and test the content of each component in the filtered water. The test method is as follows: Use the ceramic product to filter 10L of natural water, record the time taken, and take the average filtration speed of each group of ceramic products as the filtration speed of the ceramic product; select commercially available PDA culture medium (selected from Beijing Yaoyou Technology, model Y047, item number HRBS-Y047), each sample corresponds to 5 culture media tests, and each sample is coated on the PDA culture medium of the corresponding group at 1mL / piece. After culturing for 24 hours, the colony count is obtained by counting.

[0101] Table 1 Performance test results of environmentally friendly water purification ceramic products

[0102]

[0103]

[0104] It can be seen from the contents of Examples 1-3 and the test data in Table 1 that the water purification sludge powder prepared in a specific preparation example is mixed with raw materials such as fly ash, coal gangue and red mud, ball milled, pressed and sintered to produce a ceramic product with high filtration efficiency, fast filtration speed, high compressive strength, high flexural strength, and sufficient resistance to breakage.

[0105] In Example 4 and Example 5, the water purification sludge powder prepared in Preparation Example 3 and Preparation Example 4 was used respectively. Compared with Preparation Example 1, Preparation Example 3 did not add nano-ferroferric oxide, and Preparation Example 4 did not add silver nanoparticles and nanocellulose. Table 1 shows that compared with Example 1, the colony counts of ceramic products prepared in Examples 4 and 5 increased, and other properties did not change much, especially the colony count in Example 5 increased significantly.

[0106] Compared with Example 1, silicon carbide fibers and titanium carbide particles are further added to the ceramic products in Examples 6 and 7. The data in Table 1 show that the compressive strength and flexural strength of the ceramic products prepared in Examples 6 and 7 are increased, and the crack resistance is enhanced.

[0107] Compared with Example 9, Example 8 uses silicon carbide fibers instead of titanium carbide particles, while compared with Example 7, Example 9 does not add silicon carbide fibers but only adds titanium carbide particles. Table 1 shows that the bending strength and compressive strength of the ceramic products prepared in Example 8 and Example 9 decrease.

[0108] Compared with Example 7, Examples 10 and 11 also use silver nanowires to pretreat silicon carbide. From the data in Table 1, it can be seen that the colony counts of the ceramic products prepared in Examples 10 and 11 are significantly reduced, which shows that pretreating silicon carbide fibers can improve the antibacterial properties of ceramic products.

[0109] In Example 12, compared with Example 11, vacuum treatment, intercalation, oxidation and reduction were not performed during the pretreatment of silicon carbide fibers, so no graphite layer was formed on the surface thereof. Only silver nanowires were used for treatment, and it can be seen that the antibacterial property thereof was significantly reduced.

[0110] Compared with Example 11, when pre-treating silicon carbide, although the surface of Example 13 is coated with a graphite layer, no intercalation is performed. It can be seen that its antibacterial property is similar to that of Example 12. It can be seen that intercalation, oxidation, etc. can make the graphite layer form graphene, thereby improving the antibacterial ability.

[0111] Compared with Example 11, Example 14 does not spray the treatment liquid containing silver nanowires, and the graphene-coated fiber is the final product. The data in Table 1 show that the antibacterial ability of the ceramic product prepared in Example 14 is reduced.

[0112] Compared with Example 11, Examples 15 and 16 subjected the titanium carbide particles to a series of treatments. From the comparison data, it can be seen that the compressive strength and flexural strength of the ceramic products prepared in Examples 15 and 16 are improved, and the filtration speed is accelerated and the filtration volume is increased.

[0113] In Example 17, compared with Example 16, zirconium oxide was not used in pretreating the titanium carbide particles. It can be seen that the compressive strength of the ceramic product is reduced.

[0114] Compared with Example 16, Example 18 does not use polyurethane foam, but only mixes titanium carbide particles with zirconium oxide. The resulting ceramic product has better compressive strength and flexural strength, but the filtration speed is reduced.

[0115] Compared with Example 16, in Examples 19 and 20, an iron oxide film is adhered to the surface of the embryo body. By comparison, it can be seen that the filtration speed of the ceramic products made in Examples 19-20 is increased and the antibacterial ability is also improved.

[0116] No low-melting-point glass powder was added in Example 21, and deionized water was used instead of the epoxy resin emulsion in Example 22. Compared with Example 20, the compressive strength of the ceramic product made in Example 21 was slightly decreased, and the various properties of the ceramic product made in Example 22 did not change much. Compared with Example 20, Example 23 only sprayed the spray liquid once, and it can be seen that the filtration speed and antibacterial rate of the ceramic product manufactured were reduced.

[0117] Compared with Example 20, Example 24 only uses iron nitrate solution to impregnate the embryo and then roasts it, thereby forming an iron oxide film on the embryo. It can be seen that its filtration efficiency and antibacterial ability are not as good as those of Example 20.

[0118] Compared with Example 1, red mud is used instead of water purification sludge powder in Comparative Example 1, and fly ash is used instead of red mud in Comparative Example 2. Table 1 shows that the compressive strength and flexural strength of the ceramic products prepared in Comparative Example 1 and Comparative Example 2 decrease, and the filtration speed deteriorates.

[0119] The adhesion strength of the iron oxide film on the embryo was tested according to the following method, and the test results were recorded in Table 2:

[0120] 1. Acid and alkali resistance: Add the ceramic products to 100ml of hydrochloric acid solution with a pH of 3 or sodium hydroxide solution with a pH of 12 and soak for 24 hours. Take a small amount of solution and dilute it several times to analyze the content of iron coating material dissolved therein, and calculate the maximum shedding rate of the ceramic products under acidic and alkaline conditions.

[0121] 2. Mechanical friction resistance: Under mechanical vibration conditions, place the ceramic product in 100 ml of distilled water, oscillate at 100 r / min at 25°C for 24 hours, take samples to analyze the content of the iron coating material, and calculate the maximum shedding rate of the ceramic product under mechanical vibration conditions.

[0122] Table 2 Test results of iron oxide film adhesion strength of ceramic products

[0123] project Hydrochloric acid shedding rate / % Sodium hydroxide shedding rate / % Mechanical vibration shedding rate / % Embodiment 19 0.01514 0.01447 0.2115 Embodiment 20 0.01512 0.01445 0.2112 Embodiment 21 0.01581 0.01484 0.2247 Embodiment 22 0.01573 0.01469 0.2231 Embodiment 23 0.1598 0.1684 0.2287 Embodiment 24 0.01624 0.01507 0.2305

[0124] It can be seen from the data in Table 2 that the shedding rate of the iron oxide film on the surface of the ceramic products prepared in Examples 19 and 20 in hydrochloric acid and sodium hydroxide solutions is small, and the anti-mechanical vibration effect is better; while in Examples 21 and 22, no low-melting point glass powder and epoxy resin emulsion were added, respectively, and the shedding rate of the iron oxide film on the surface of the ceramic products prepared increased; in Example 23, the spray liquid was sprayed on the embryo only once, while in Example 24, the shedding rate of the iron oxide film obtained by calcining with ferric nitrate solution was greater than that of Example 23, indicating that the use of a spray liquid containing low-melting point glass powder for spraying can improve the adhesion strength of the iron oxide film.

[0125] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. An environmentally friendly water purification ceramic product, characterized in that: The invention comprises the following raw materials in parts by weight: 72.5-100 parts of lightweight building materials, 20-30 parts of pore-forming agents and 8-10 parts of clay; the lightweight building materials comprise: 20-30 parts of coal gangue, 15-20 parts of fly ash, 30-40 parts of red mud and 7.5-10 parts of water purification sludge powder.

2. The environmentally friendly water purification ceramic product according to claim 1, characterized in that: The preparation method of the water purification sludge powder is as follows: drying, grinding, passing through a 100-mesh sieve, placing in a sodium citrate solution, stirring for 20-24 hours, filtering, washing, and drying to obtain pre-treated sludge powder; The nanometer ferroferric oxide particles are dispersed in deionized water to prepare a solution with a concentration of 0.13-0.15 g / ml, and the nanometer silver particles and nanometer cellulose are added and stirred evenly to prepare a treatment solution, which is sprayed onto the pretreated sludge powder and dried at 60-80°C.

3. The environmentally friendly water purification ceramic product according to claim 1, characterized in that: The ceramic product is further added with 10-15 parts by weight of silicon carbide fibers and 5-10 parts by weight of titanium carbide particles.

4. The environmentally friendly water purification ceramic product according to claim 3, characterized in that: The silicon carbide fiber is pretreated as follows: The silicon carbide fiber is placed in a vacuum treatment at 1700-1750°C and 0.3-0.5Pa for 20-30 minutes to obtain a graphite layer-coated fiber; The graphene-coated fiber is obtained by intercalating, oxidizing and reducing the graphite layer-coated fiber; The silver nanowires and hydroxypropyl methylcellulose solution are uniformly mixed to obtain a treatment solution, the treatment solution is sprayed on the graphene-coated fibers, and dried at 100-120° C. for 8-10 minutes. The mass ratio of the graphene-coated fibers to the silver nanowires and hydroxypropyl methylcellulose is 10:1-1.5:2.5-3.

5. The environmentally friendly water purification ceramic product according to claim 3, characterized in that: The titanium carbide particles are pretreated by the following method: The polyurethane foam is soaked in an alkali solution with a concentration of 13-15wt% at 50-55°C for 4-5h, dried, and then soaked in a polyvinyl alcohol solution with a concentration of 5-6wt% for 22-24h, and dried to obtain a pretreated foam; Dispersing titanium carbide particles and zirconium oxide in deionized water to obtain a suspension with a solid content of 65-70%, adding a polyacrylate ammonium solution with a concentration of 30-35wt%, adjusting the pH to 9, adding silica sol and polyamide wax, and ball milling for 20-24h to obtain a slurry, wherein the mass ratio of titanium carbide particles to zirconium oxide is 1:0.1-0.2, and the mass ratio of titanium carbide particles, ammonium polyacrylate, silica sol and polyamide wax is 1:0.02-0.04:0.02-0.04:0.01-0.02; The pretreated foam is immersed in the slurry for 20-24 hours, and after squeezing out the excess slurry, it is dried at room temperature for 22-24 hours, and then dried at 100-120° C. for 4-6 hours.

6. The environmentally friendly water purification ceramic product according to claim 1, characterized in that: The porogen is selected from at least one of coal powder, limestone and dolomite.

7. The method for preparing the environmentally friendly water-purifying ceramic product according to any one of claims 1 to 6, characterized in that: The following steps are involved: The red mud, fly ash, water purification sludge powder and coal gangue are mixed with the porogen and clay, and then the mixture is evenly mixed. The mixture is sieved after ball milling and pressed into a shape to obtain a body. The body is then dried and sintered, cooled to room temperature and discharged to obtain an environmentally friendly water purification ceramic product.

8. The method for preparing the environmentally friendly water-purifying ceramic product according to claim 7, characterized in that: The embryo body is first subjected to the following treatments before sintering: The embryos are soaked in hydrochloric acid for 20-24 hours, and then washed to neutrality to obtain pretreated embryos; The iron oxide powder is mixed evenly with low melting point glass powder, epoxy resin emulsion and curing agent to prepare a spraying liquid, wherein the mass ratio of the iron oxide, low melting point glass powder, epoxy resin emulsion and curing agent is 1:0.2-0.4:1-1.2:0.01-0.012; The spraying liquid is uniformly sprayed on the pretreated embryo body, and dried at 80-100° C., and the spraying and drying are repeated 4 times.

9. The method for preparing the environmentally friendly water-purifying ceramic product according to claim 7, characterized in that: The mass ratio of the spraying mass of the spraying liquid to the mass ratio of the pretreated embryo body is 0.2-0.3:

1.

10. The method for preparing the environmentally friendly water-purifying ceramic product according to claim 7, characterized in that: During the sintering, the steel is first preheated at 360-500° C. for 10-30 minutes, then heated to 1050-1100° C. and calcined for 20-30 minutes.

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