Air purification filter material, production process, purification device and dual purification method

Abstract

The invention relates to an air purification filter material, a production process, a purification device and a dual purification method, and belongs to the technical field of air purification, the production process comprises the following steps: S11, adding copper oxide and iron powder into diatomite in proportion to obtain diatomite loaded with metal oxide; s12, in a horizontal ball mill, mixing potassium permanganate powder with alumina balls to obtain a first mixture, and after ball milling is completed, separating the alumina balls to obtain potassium permanganate powder with the average particle size being a second particle size; s13, mixing potassium permanganate powder and polyethylene into the diatomite loaded with the metal oxide according to the proportion, and uniformly mixing to obtain a second mixture; s14, adding clay into the second mixture to obtain a third mixture to form a blank filter material ball; and S15, drying the blank filter material balls at a set temperature for a fourth set time to promote formation of pore channels in the blank filter material balls, and naturally cooling to obtain the air purification filter material. The air purification filter material manufactured by the production process has a good air purification effect.

Description

Technical Field

[0001] The invention relates to the technical field of air purification, and in particular to an air purification filter material, a production process, a purification device and a double purification method. Background Art

[0002] The stench and odor of air pollution has always been one of the most complained environmental issues by the public. Many types of air pollution have low concentrations. For example, some odor pollutants have low olfactory thresholds. Even if the emissions meet the relevant standards, they will still cause nuisance to the public. Therefore, the requirements for air pollution purification technology are extremely high. However, existing air purification materials such as activated carbon and potassium permanganate are not effective in treating air pollutants. Summary of the invention

[0003] Based on this, it is necessary to provide an air purification filter material, a production process, a purification device and a double purification method to address the problem that existing air purification materials have poor treatment effects on air pollutants.

[0004] A production process for air purification filter material comprises the following steps: S11, adding copper oxide and iron powder to diatomaceous earth of a first particle size in proportion to obtain diatomaceous earth loaded with metal oxides, and stirring the diatomaceous earth loaded with metal oxides by a roller for a first set time; S12, using aluminum oxide balls of a first particle size as grinding media in a horizontal ball mill, mixing potassium permanganate powder and aluminum oxide balls in a certain weight ratio to obtain a first mixture, ball milling the first mixture for a second set time, and separating the aluminum oxide balls after the ball milling to obtain potassium permanganate powder with an average particle size of a second particle size; S13, mixing potassium permanganate powder of a second particle size and polyethylene of a second particle size into the diatomaceous earth loaded with metal oxides according to a proportion, and mixing them evenly to obtain a second mixture;

[0005] S14, adding clay to the second mixture to obtain a third mixture, kneading for a third set time under a set stirring speed condition, so that the potassium permanganate mixture is stirred and formed, granulated into balls, and formed into blank filter material balls; S15, drying the blank filter material balls at a set temperature for a fourth set time, the polyethylene melts during the drying process, prompting the formation of channels inside the blank filter material balls, and obtaining air purification filter material after natural cooling.

[0006] The first aspect of the present application discloses a production process for air purification filter material, by uniformly loading copper oxide and iron powder onto diatomite in step S11, the dispersibility and activity of these metal oxides in subsequent reactions can be improved. The drum stirring ensures the full mixing between the components, which is conducive to the formation of a uniform composite material. The ratio of the iron powder added to the copper oxide is within the range of 5:8-10:3. By grinding potassium permanganate with a horizontal ball mill and alumina balls in step S12, a potassium permanganate powder with a finer particle size can be obtained, which increases its specific surface area and improves oxidation efficiency. The potassium permanganate powder after ball milling is more uniform and delicate, which helps to better integrate with other materials. By mixing potassium permanganate powder and polyethylene into diatomite loaded with metal oxides in step S13, the stability and functionality of the composite material are further enhanced. The addition of polyethylene not only improves the mechanical strength of the filter material, but also lays the foundation for subsequent molding and pore formation. The addition of clay in step S14 increases the cohesiveness and plasticity of the filter material, which helps to form a stable particle structure. The kneading process makes the components more closely combined, improving the overall performance of the filter material. The rough filter material balls formed after granulation have good fluidity and filling properties, which are convenient for subsequent processing and application. The polyethylene melts during the drying process in step S15 to form a developed pore structure, which greatly increases the specific surface area and adsorption capacity of the filter material. The porous structure of the filter material is conducive to the better contact and removal of pollutants in the gas and liquid with the active substances on the surface of the filter material. The air purification filter material obtained after natural cooling is sealed in a light-proof bag for storage. Sealing and storing in a light-proof bag can prevent the filter material from getting damp and oxidized, and extend its service life. The air purification filter material produced by the above method has a high degree of uniformity and stability, can effectively remove a variety of pollutants in the air, such as volatile organic compounds, bacteria, viruses, odors, etc., has a better treatment effect on air pollutants, and is worthy of promotion and use. Moreover, the porous structure and developed pores of the filter material give it excellent adsorption performance and air permeability, and will not cause excessive air circulation resistance.

[0007] In one embodiment, the first particle size is 350-500 mesh. The first particle size is 350-500 mesh, and thus the particle size range of 350-500 mesh means that the diatomaceous earth particles have a relatively small diameter, thereby providing a larger specific surface area. This enables the diatomaceous earth to more effectively adsorb harmful gases and particles in the air. This multi-level pore network not only increases the adsorption sites, but also increases the diffusion rate of gas molecules inside the filter material. Moreover, the finer diatomaceous earth particles are easier to fully mix with other additives such as copper oxide, iron powder and potassium permanganate powder.

[0008] In one embodiment, the second particle size is 1000 mesh. With the second particle size of 1000 mesh, the polyethylene particles of 1000 mesh are very fine, which makes it easier for the polyethylene particles to be evenly mixed with other materials (such as diatomaceous earth, potassium permanganate powder, etc.). Fine particles of polyethylene reduce the agglomeration phenomenon that may occur during the mixing process, ensuring that most of the polyethylene particles can fully play their role.

[0009] In one embodiment, the first particle size is 3-5 mm. The first particle size is 3-5 mm, and the 3-5 mm alumina ball particle size is moderate, which can provide sufficient grinding force in the horizontal ball mill. This design can grind the potassium permanganate powder into finer particles, increase its specific surface area and reactivity. In addition, the alumina balls can effectively collide and rub during the ball milling process, thereby improving the grinding efficiency. This helps to achieve the desired particle size in a shorter time, reducing energy consumption and production time.

[0010] In one embodiment, the second particle size is 2-3 μm. The second particle size is 2-3 μm, so that the specific surface area of ​​the potassium permanganate particles is larger. This design allows more potassium permanganate molecules to come into contact with pollutants in the air, such as organic pollutants such as formaldehyde and benzene, and microorganisms such as bacteria and viruses, so as to efficiently oxidize and decompose them, thereby enhancing the ability of the air purification filter to remove various pollutants. This fine-particle potassium permanganate can interact with metal oxides such as copper oxide and iron powder at a more microscopic level, jointly promoting the adsorption, catalysis and oxidation process of pollutants, and further improving the comprehensive purification efficiency of the filter material.

[0011] In one embodiment, the stirring speed is set to 4000r / min. By setting the stirring speed to 4000r / min, when clay is added and kneaded in step S14, the stirring speed of 4000r / min can make the potassium permanganate mixture and the clay quickly and fully mixed. Potassium permanganate powder, polyethylene, and diatomaceous earth previously loaded with metal oxides and other ingredients can be more finely dispersed at this speed to avoid excessive differences in local component concentrations. This helps to ensure that the chemical composition inside each blank filter ball is uniform, thereby ensuring the stability of the air purification effect during use.

[0012] In one embodiment, the first set time is 1-2 hours. The 1-2 hours of stirring time allows the copper oxide and iron powder to be fully dispersed between the diatomaceous earth particles. Sufficient stirring time prepares homogeneous raw materials for subsequent process steps such as ball milling, mixing, kneading and drying. This helps to ensure the smooth progress of the entire production process and improve the quality of the final product.

[0013] In one embodiment, the second set time is 2-3h. The ball milling time of 2-3 hours can ensure that the potassium permanganate powder is fully ground to meet the requirements of the average second particle size. The particle size obtained by the ball milling time of 2-3 hours is crucial for the subsequent mixing and granulation process, so that the pore structure and filtration efficiency of the filter material are better. Moreover, the ball milling time of 2-3 hours is a balance point, which can ensure that the particle size and distribution of potassium permanganate powder meet the requirements, and will not reduce production efficiency due to excessive grinding time.

[0014] In one embodiment, the third setting time is 50-80 minutes. By setting the third setting time to 50-80 minutes, it is possible to ensure that the potassium permanganate mixture and the clay are fully and evenly mixed within the kneading time of 50-80 minutes. A sufficiently long kneading time makes the combination of potassium permanganate powder, polyethylene and diatomaceous earth loaded with metal oxides tighter and more uniform. This helps to form a structurally stable rough filter ball in the subsequent granulation and balling process, avoiding internal structural defects of the filter ball caused by uneven mixing, such as problems such as excessively high or low local density.

[0015] In one embodiment, the fourth setting time is 2-3h. By setting the fourth setting time to 2-3h, during the drying process, the melted polyethylene can flow inside the blank filter ball and fill the space, thereby promoting the formation of developed channels inside. If the drying time is too short, the polyethylene may not be able to melt completely or flow sufficiently, resulting in incomplete channel formation, affecting the specific surface area of ​​the filter ball and the air filtration efficiency; and if the drying time is too long, although the channels are well developed, it may cause problems such as excessive drying and cracking on the surface of the filter ball, affecting the overall structural integrity and stability of the filter ball. Therefore, the drying time of 2-3h is sufficient to allow the polyethylene to fully melt while ensuring the quality of the filter ball.

[0016] In one embodiment, the set temperature is 200-220° C. By setting the temperature to 200-220° C., the structural integrity of the filter ball is maintained while the polyethylene is melted. This temperature range allows the polyethylene to play a role in shaping the pores, while preventing the surface of the filter ball from drying, hardening or cracking prematurely due to excessively high temperature.

[0017] An air purification filter material is produced by the above-mentioned production process of air purification filter material, and the components of the air purification filter material include: potassium permanganate; diatomaceous earth; clay; iron powder; copper oxide; and polyethylene.

[0018] The second aspect of the present application discloses an air purification filter material. In the air purification process, potassium permanganate, as a strong oxidant, can undergo redox reactions with organic pollutants in the air, such as formaldehyde, and potassium permanganate can oxidize and decompose them into harmless substances such as carbon dioxide and water, thereby effectively reducing the concentration of organic pollutants in indoor air and improving air quality. Diatomaceous earth has a unique porous structure and its specific surface area is very large. This enables the air purification filter material to adsorb a large amount of air pollutants. Clay helps to bond the various components of the filter material together, and during the kneading process, the potassium permanganate mixture can be stirred and formed and granulated into balls. The transition metal ions after the redox reaction of iron powder and copper oxide can continue to produce Fenton and Fenton-like advanced oxidation processes with the byproducts of potassium permanganate, and can further react with the hydrogen ions of formaldehyde to generate water molecules, which is of positive significance for further eliminating formaldehyde. By adding high-density polyethylene, a thermoplastic resin formed by the polymerization of ethylene, it is a non-toxic, tasteless, odorless white particle with a tight molecular structure, good heat resistance and cold resistance, good chemical stability, high rigidity and toughness, and good mechanical strength. The melting of high-density polyethylene promotes the formation of developed channels inside the filter ball. These channels increase the flow path of air inside the filter material, allowing the air to more fully contact with the various active ingredients in the filter material, thereby improving the air purification efficiency.

[0019] In one embodiment, the composition of the air purification filter material is as follows by mass percentage: the content of potassium permanganate is 60-80wt%; the content of diatomaceous earth is 10-15wt%; the content of clay is 5-10wt%; the content of iron powder is 5-10wt%; the content of copper oxide is 3-8wt%; the content of polyethylene is 0.5-1wt%. The content of potassium permanganate is 60-80wt%, and potassium permanganate accounts for the largest proportion, which makes it the core component of the filter material to play the air purification function. Due to its strong oxidizing property, a high content of potassium permanganate can efficiently treat various pollutants in the air. Such a content ratio is conducive to the synergistic effect of potassium permanganate and other auxiliary ingredients (such as iron powder and copper oxide). The content of diatomaceous earth can provide sufficient specific surface area for adsorbing solid particles in the air, and the stable chemical properties of diatomaceous earth ensure that the adsorption effect can be continuously exerted under different environmental conditions. Clay within this content range is sufficient to play a good bonding role in the production process of filter media, and can effectively bond potassium permanganate, diatomaceous earth, iron powder, copper oxide and high-density polyethylene together, so that the filter media can be smoothly formed into a spherical shape during the kneading process. The content of iron powder and copper oxide can ensure the oxidation efficiency of potassium permanganate and enhance the filter media's ability to remove these pollutants. The content of high-density polyethylene is appropriate, and the liquid formed after melting can further shape more developed and uniform pores on the basis of porous structures such as diatomaceous earth.

[0020] In one embodiment, the air purification filter material is a porous structure, the porosity of the air purification filter material is 40-60%, the particle size is 3-6mm, and the stacking strength is ≥200N / particle. The porous structure allows a large number of interconnected pores to exist inside the filter material, and the porosity of 40-60% means that there is enough space for air circulation. When air passes through the filter material, the pollutants in the air can fully contact the active ingredients (such as potassium permanganate, etc.) inside the filter material. This wider range of contact helps to improve the purification efficiency of adsorption, catalytic oxidation, etc. of various pollutants. The particle size of 3-6mm is relatively moderate, which is convenient for use with components of purification equipment such as filter frames. Moreover, the air flow rate will not be affected by the excessive resistance of air passing through the filter material due to the small particle size, nor will the contact time and efficiency of pollutants and filter material be reduced due to the excessive air resistance caused by the large particle size. The stacking strength ≥200N / particle can prevent the filter material from being over-compacted or broken due to its own gravity or slight external vibration during use, thereby maintaining the pore structure and performance of the filter material stable.

[0021] A purification device comprises: a purification structure; and the above-mentioned air purification filter material, wherein the air purification filter material is used to be filled in the purification structure.

[0022] The third aspect of the present application discloses a purification device, which can efficiently purify the air by filling the purification device with air purification filter material, which has the characteristics of porous structure, suitable porosity, specific particle size and high stacking strength. Active ingredients such as potassium permanganate in the filter material are fully in contact with the air by virtue of the porous structure of the filter material, and organic pollutants, bacteria, viruses, dust particles, etc. in the air are adsorbed, oxidized and decomposed, etc., thereby significantly improving the air quality.

[0023] A double purification method is applied to the above-mentioned purification device, comprising the following steps: S21, preparing an oxidizing liquid by means of hydrogen peroxide and dilute sulfuric acid, and adjusting the oxidizing liquid to a preset pH range; S22, filling air purification filter material in the purification structure; S23, spraying the oxidizing liquid on the air purification filter material, and adjusting the spraying frequency and spraying intensity according to the working conditions.

[0024] The fourth aspect of the present application discloses a double purification method, which can spray hydrogen peroxide onto the composite oxide material at regular intervals as needed, and at the same time make full use of the reaction product Mn of potassium permanganate. 4+, producing more advanced Fenton and Fenton-like oxidation reactions. Transition metal iron and copper are used as active elements in the composite oxidation material to promote electron transfer, so as to achieve the purpose of improving the metal valence cycle and reducing the consumption of oxidants. At the same time, the oxidation activity of potassium permanganate is improved, and a synergistic effect is produced in the chemical oxidation reaction, which can quickly decompose odor molecules and achieve efficient purification. By adjusting the oxidizing liquid to a specific pH range, the oxidation performance of hydrogen peroxide can be optimized. For example, at a suitable pH value, the rate and efficiency of hydrogen peroxide decomposition to produce hydroxyl radicals (·OH) will increase. Hydroxyl radicals have extremely strong oxidizing properties and can quickly and effectively oxidize and decompose organic pollutants in the air, such as organic compounds, organic components on the surface of bacteria and viruses, etc. The air can be double purified by the oxidizing liquid and air purification filter material, and the purification effect is better.

[0025] In one embodiment, the preset pH value range is 3-4. By setting the preset pH value range to 3-4, the decomposition reaction of hydrogen peroxide is more likely to proceed in the direction of generating hydroxyl radicals (·OH). Hydroxyl radicals have extremely strong oxidizing properties and can quickly react with organic pollutants in the air, and have high air purification efficiency.

[0026] In one embodiment, the specific steps of step S23 are as follows: S231, setting the degree to be set as intermittent spraying of oxidizing liquid; S232, detecting the concentration of pollutants in the air; S233, when it is detected that the concentration of pollutants in the air is higher than the preset value, adjusting the purification device to spray the oxidizing liquid with the first spray frequency and the first spray intensity; S234, when it is detected that the concentration of pollutants in the air is lower than the preset value, adjusting the purification device to spray the oxidizing liquid with the second spray frequency and the second spray intensity; the first spray frequency is greater than the second spray frequency, and the first spray intensity is greater than the second spray intensity. By detecting the concentration of pollutants in the air to adjust the spray efficiency and the spray intensity, it can be ensured that sufficient spraying can be achieved when the concentration of pollutants is high, thereby achieving a better air purification effect; when the concentration of pollutants is lower than the preset value, a lower spray frequency and a lower spray intensity are used. In this way, excessive use of oxidizing liquid can be avoided when the air quality is good, and the waste of chemical reagents such as hydrogen peroxide and dilute sulfuric acid is reduced, thereby reducing the purification cost, and also reducing the amount of chemical waste liquid generated, which meets the requirements of environmental protection and sustainable development. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The figure is a flow chart of the production process of air purification filter materials;

[0028] Figure 2 is a schematic diagram of the process of the double purification method;

[0029] Figure 3It is a flowchart diagram of step S23. DETAILED DESCRIPTION

[0030] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0032] Example 1

[0033] like Figure 1 As shown, this embodiment discloses a production process for air purification filter material, comprising the following steps: S11, adding copper oxide and iron powder in proportion to diatomaceous earth of a first particle size to obtain diatomaceous earth loaded with metal oxides, and stirring the diatomaceous earth loaded with metal oxides by a drum for a first set time; S12, in a horizontal ball mill, using aluminum oxide balls of a first particle size as grinding media, mixing potassium permanganate powder and aluminum oxide balls in a certain weight ratio to obtain a first mixture, ball milling the first mixture for a second set time, and separating the aluminum oxide balls after the ball milling to obtain a diatomaceous earth with an average particle size of a second particle size Potassium permanganate powder; S13, mixing potassium permanganate powder of a second particle size and polyethylene of a second particle size into diatomaceous earth loaded with metal oxides according to a ratio, and mixing them evenly to obtain a second mixture; S14, adding clay to the second mixture to obtain a third mixture, kneading for a third set time under the condition of a set stirring speed, so that the potassium permanganate mixture is stirred and formed, granulated into balls, and formed into blank filter material balls; S15, drying the blank filter material balls at a set temperature for a fourth set time, during the drying process, the polyethylene melts, prompting the formation of channels inside the blank filter material balls, and obtaining air purification filter material after natural cooling.

[0034] The first aspect of the present application discloses a production process for air purification filter material, by uniformly loading copper oxide and iron powder onto diatomite in step S11, the dispersibility and activity of these metal oxides in subsequent reactions can be improved. The drum stirring ensures the full mixing between the components, which is conducive to the formation of a uniform composite material. The ratio of the iron powder added to the copper oxide is within the range of 5:8-10:3. By grinding potassium permanganate with a horizontal ball mill and alumina balls in step S12, a potassium permanganate powder with a finer particle size can be obtained, which increases its specific surface area and improves oxidation efficiency. The potassium permanganate powder after ball milling is more uniform and delicate, which helps to better integrate with other materials. By mixing potassium permanganate powder and polyethylene into diatomite loaded with metal oxides in step S13, the stability and functionality of the composite material are further enhanced. The addition of polyethylene not only improves the mechanical strength of the filter material, but also lays the foundation for subsequent molding and pore formation. The addition of clay in step S14 increases the cohesiveness and plasticity of the filter material, which helps to form a stable particle structure. The kneading process makes the components more closely combined, improving the overall performance of the filter material. The rough filter material balls formed after granulation have good fluidity and filling properties, which are convenient for subsequent processing and application. The polyethylene melts during the drying process in step S15 to form a developed pore structure, which greatly increases the specific surface area and adsorption capacity of the filter material. The porous structure of the filter material is conducive to the better contact and removal of pollutants in the gas and liquid with the active substances on the surface of the filter material. The air purification filter material obtained after natural cooling is sealed in a light-proof bag for storage. Sealing and storing in a light-proof bag can prevent the filter material from getting damp and oxidized, and extend its service life. The air purification filter material produced by the above method has a high degree of uniformity and stability, can effectively remove a variety of pollutants in the air, such as volatile organic compounds, bacteria, viruses, odors, etc., has a better treatment effect on air pollutants, and is worthy of promotion and use. Moreover, the porous structure and developed pores of the filter material give it excellent adsorption performance and air permeability, and will not cause excessive air circulation resistance.

[0035] In addition to the features of the above-mentioned embodiment, the present embodiment further defines that: the first particle size is 350-500 mesh. The first particle size is 350-500 mesh, and thus the particle size range of 350-500 mesh means that the diatomaceous earth particles have a relatively small diameter, thereby providing a larger specific surface area. This enables diatomaceous earth to more effectively adsorb harmful gases and particles in the air. This multi-level pore network not only increases the adsorption sites, but also increases the diffusion rate of gas molecules inside the filter material. Moreover, finer diatomaceous earth particles are easier to fully mix with other additives such as copper oxide, iron powder and potassium permanganate powder.

[0036] In addition to the features of the above embodiment, this embodiment further defines that: the second particle size is 1000 mesh. With the second particle size of 1000 mesh, the polyethylene particles of 1000 mesh are very fine, which makes it easier for the polyethylene particles to be evenly mixed with other materials (such as diatomaceous earth, potassium permanganate powder, etc.). Fine particles of polyethylene reduce the agglomeration phenomenon that may occur during the mixing process, ensuring that most of the polyethylene particles can fully play their role.

[0037] In addition to the features of the above embodiment, this embodiment further defines that: the first particle size is 3-5 mm. The first particle size is 3-5 mm, and the 3-5 mm alumina ball particle size is moderate, which can provide sufficient grinding force in the horizontal ball mill. This design can grind the potassium permanganate powder into finer particles, increase its specific surface area and reaction activity. Moreover, the alumina balls can effectively collide and rub during the ball milling process, thereby improving the grinding efficiency. This helps to achieve the desired particle size in a shorter time, reducing energy consumption and production time.

[0038] In addition to the features of the above embodiments, the present embodiment further defines that: the second particle size is 2-3 μm. The second particle size is 2-3 μm, so that the specific surface area of ​​the potassium permanganate particles is larger. This design allows more potassium permanganate molecules to come into contact with pollutants in the air, such as organic pollutants such as formaldehyde and benzene, and microorganisms such as bacteria and viruses, thereby efficiently oxidizing and decomposing them, and enhancing the ability of the air purification filter material to remove various pollutants. This fine-particle potassium permanganate can interact with metal oxides such as copper oxide and iron powder at a more microscopic level, jointly promoting the adsorption, catalysis and oxidation process of pollutants, and further improving the comprehensive purification efficiency of the filter material.

[0039] In addition to the features of the above-mentioned embodiment, the present embodiment further defines: the stirring speed is set to 4000r / min. By setting the stirring speed to 4000r / min, when clay is added and kneaded in step S14, the stirring speed of 4000r / min can make the potassium permanganate mixture and the clay mix quickly and fully. Potassium permanganate powder, polyethylene, and diatomaceous earth previously loaded with metal oxides and other ingredients can be more finely dispersed at this speed to avoid excessive differences in local component concentrations. This helps to ensure that the chemical composition inside each blank filter ball is uniform, thereby ensuring the stability of the air purification effect during use.

[0040] In addition to the features of the above embodiment, the present embodiment further defines that: the first set time is 1-2 hours. The 1-2 hours of stirring time allows the copper oxide and iron powder to be fully dispersed between the diatomaceous earth particles. Sufficient stirring time prepares homogeneous raw materials for subsequent process steps such as ball milling, mixing, kneading and drying. This helps to ensure the smooth progress of the entire production process and improve the quality of the final product.

[0041] In addition to the features of the above embodiment, the present embodiment further defines that: the second set time is 2-3h. The ball milling time of 2-3 hours can ensure that the potassium permanganate powder is fully ground to meet the requirements of the average second particle size. The particle size obtained by the ball milling time of 2-3 hours is crucial for the subsequent mixing and granulation process, so that the pore structure and filtration efficiency of the filter material are better. Moreover, the ball milling time of 2-3 hours is a balance point, which can ensure that the particle size and distribution of potassium permanganate powder meet the requirements, and will not reduce the production efficiency due to excessive grinding time.

[0042] In addition to the features of the above-mentioned embodiment, the present embodiment further defines that: the third setting time is 50-80 minutes. By setting the third setting time to 50-80 minutes, it is possible to ensure that the potassium permanganate mixture and the clay are fully and evenly mixed within the kneading time of 50-80 minutes. A sufficiently long kneading time makes the combination between potassium permanganate powder, polyethylene and diatomaceous earth loaded with metal oxides tighter and more uniform. This helps to form a structurally stable rough filter ball in the subsequent granulation and balling process, avoiding internal structural defects of the filter ball caused by uneven mixing, such as problems such as excessively high or low local density.

[0043] In addition to the features of the above-mentioned embodiment, the present embodiment further defines that: the fourth setting time is 2-3h. By setting the fourth setting time to 2-3h, during the drying process, the melted polyethylene can flow inside the blank filter ball and fill the space, thereby promoting the formation of developed pores inside. If the drying time is too short, the polyethylene may not be able to melt completely or flow sufficiently, resulting in incomplete pore formation, affecting the specific surface area of ​​the filter ball and the air filtration efficiency; and if the drying time is too long, although the pores are well developed, it may cause problems such as excessive drying and cracking on the surface of the filter ball, affecting the overall structural integrity and stability of the filter ball. Therefore, the drying time of 2-3h is sufficient to allow the polyethylene to fully melt while ensuring the quality of the filter ball.

[0044] In addition to the features of the above embodiment, this embodiment further defines that: the set temperature is 200-220°C. By setting the temperature to 200-220°C, the structural integrity of the filter ball is maintained while the polyethylene is melted. This temperature range allows the polyethylene to play a role in shaping the pores, while preventing the surface of the filter ball from drying, hardening or cracking prematurely due to excessively high temperature.

[0045] Example 2

[0046] This embodiment discloses an air purification filter material, which is produced by the above-mentioned production process of air purification filter material. The components of the air purification filter material include: potassium permanganate; diatomaceous earth; clay; iron powder; copper oxide; and polyethylene.

[0047] The second aspect of the present application discloses an air purification filter material. In the air purification process, potassium permanganate, as a strong oxidant, can react with organic pollutants in the air, such as formaldehyde, to undergo redox reactions. Potassium permanganate can oxidize and decompose them into harmless substances such as carbon dioxide and water, thereby effectively reducing the concentration of organic pollutants in indoor air and improving air quality. Diatomaceous earth has a unique porous structure and its specific surface area is very large. This enables the air purification filter material to adsorb a large amount of air pollutants. Clay helps to bond the various components of the filter material together, and during the kneading process, the potassium permanganate mixture can be stirred and formed and granulated into balls. The transition metal ions after the redox reaction of iron powder and copper oxide can continue to produce Fenton and Fenton-like advanced oxidation processes with the byproducts of potassium permanganate, and can further react with the hydrogen ions of formaldehyde to generate water molecules, which is of positive significance for further eliminating formaldehyde. The filter material mixed with high-density polyethylene has excellent impact resistance and chemical corrosion resistance, greatly improves the mechanical strength of the filter material, and is not easy to pulverize and break. The filter material mixed with high-density polyethylene has excellent impact resistance and chemical corrosion resistance, greatly improving the mechanical strength of the filter material and making it less prone to pulverization and fragmentation. In addition to forming developed channels inside the filter material, high-density polyethylene provides structural support for the entire filter material. These channels also provide additional carrying space for oxidants, greatly improving the use efficiency of the filter material.

[0048] In addition to the features of the above embodiments, the present embodiment further defines that: by mass percentage, the composition of the air purification filter material is as follows: the content of potassium permanganate is 60-80wt%; the content of diatomaceous earth is 10-15wt%; the content of clay is 5-10wt%; the content of iron powder is 5-10wt%; the content of copper oxide is 3-8wt%; the content of polyethylene is 0.5-1wt%. The content of potassium permanganate is 60-80wt%, and potassium permanganate accounts for the largest proportion, which makes it the core component of the filter material to play the air purification function. Due to its strong oxidizing property, a high content of potassium permanganate can efficiently treat various pollutants in the air. Such a content ratio is conducive to the synergistic effect of potassium permanganate and other auxiliary components (such as iron powder and copper oxide). The content of diatomaceous earth can provide sufficient specific surface area for adsorbing solid particles in the air, and the stable chemical properties of diatomaceous earth ensure that the adsorption effect can be continuously exerted under different environmental conditions. Clay within this content range is sufficient to play a good bonding role in the production process of filter media, and can effectively bond potassium permanganate, diatomaceous earth, iron powder, copper oxide and high-density polyethylene together, so that the filter media can be smoothly formed into a spherical shape during the kneading process. The content of iron powder and copper oxide can ensure the oxidation efficiency of potassium permanganate and enhance the filter media's ability to remove these pollutants. The content of high-density polyethylene is appropriate, and the liquid formed after melting can further shape more developed and uniform pores on the basis of porous structures such as diatomaceous earth.

[0049] In addition to the features of the above embodiments, the present embodiment further defines that: the air purification filter material is a porous structure, the porosity of the air purification filter material is 40-60%, the particle size is 3-6mm, and the stacking strength is ≥200N / particle. The porous structure allows a large number of interconnected pores to exist inside the filter material, and the porosity of 40-60% means that there is enough space for air circulation. When air passes through the filter material, the pollutants in the air can fully contact the active ingredients (such as potassium permanganate, etc.) inside the filter material. This wider range of contact helps to improve the purification efficiency of adsorption, catalytic oxidation, etc. of various pollutants. The particle size of 3-6mm is relatively moderate, which is convenient for use with components of purification equipment such as filter frames. Moreover, the air flow rate will not be affected by the excessive resistance of air passing through the filter material due to the small particle size, nor will the contact time and efficiency of pollutants and filter material be reduced due to the excessive air resistance caused by the large particle size. The stacking strength ≥ 200N / particle can prevent the filter material from being over-compacted or broken due to its own gravity or slight external vibration during use, thereby maintaining the pore structure and performance of the filter material stable.

[0050] Example 3

[0051] This embodiment discloses a purification device, including: a purification structure; and the above-mentioned air purification filter material, wherein the air purification filter material is used to be filled in the purification structure.

[0052] The third aspect of the present application discloses a purification device, which can efficiently purify the air by filling the purification device with air purification filter material, which has the characteristics of porous structure, suitable porosity, specific particle size and high stacking strength. Active ingredients such as potassium permanganate in the filter material are fully in contact with the air by virtue of the porous structure of the filter material, and organic pollutants, bacteria, viruses, dust particles, etc. in the air are adsorbed, oxidized and decomposed, etc., thereby significantly improving the air quality.

[0053] Example 4

[0054] like Figure 2 As shown, this embodiment discloses a double purification method, which is applied to the above-mentioned purification device, including the following steps: S21, preparing an oxidizing liquid by hydrogen peroxide and dilute sulfuric acid, and adjusting the oxidizing liquid to a preset pH value range; S22, filling air purification filter material in the purification structure; S23, spraying the oxidizing liquid on the air purification filter material, and adjusting the spraying frequency and spraying intensity according to the working conditions.

[0055] The fourth aspect of the present application discloses a double purification method, which can spray hydrogen peroxide onto the composite oxide material at regular intervals as needed, and at the same time make full use of the reaction product Mn of potassium permanganate. 4+ , producing more advanced Fenton and Fenton-like oxidation reactions. Transition metal iron and copper are used as active elements in composite oxidation materials to promote electron transfer, so as to achieve the purpose of improving metal valence cycle and reducing oxidant consumption. At the same time, the oxidation activity of potassium permanganate is improved, and a synergistic effect is produced in the chemical oxidation reaction, which can quickly decompose odor molecules and achieve efficient purification. The oxidation performance of hydrogen peroxide can be optimized by adjusting the oxidizing liquid to a specific pH range. For example, at a suitable pH value, the rate and efficiency of hydrogen peroxide decomposition to produce hydroxyl radicals (·OH) will increase. Hydroxyl radicals have extremely strong oxidizing properties and can quickly and effectively oxidize and decompose organic pollutants in the air, such as organic compounds, organic components on the surface of bacteria and viruses, etc. The air can be double-purified by the oxidizing liquid and air purification filter material, and the purification effect is better. Taking formaldehyde HCHO as an example, a series of catalytic redox reactions are involved:

[0056] 2KMnO4+HCHO→K2MnO4+MnO2+CO2+H2O

[0057] 4KMnO4+6H2SO4+5HCHO=5CO2↑+4MnSO4+11H2O+2K2SO4

[0058] 2MnO2+3Fe→Mn2O3+3FeO

[0059] Fe+2H + →Fe 2+ +H2

[0060] FeO+2H + →Fe 2+ +H2O

[0061] 2Fe 2+ +H2O2+2H + →2Fe 3+ +2H2O

[0062] The dual composite oxidation process of the present invention involves two parts of oxidation reactions: one part is to use the strong oxidizing property of potassium permanganate to directly react with pollutants; the other part is to use the reaction byproducts of potassium permanganate and transition metals in the filter material under the support of hydrogen peroxide to produce Fenton and Fenton-like advanced oxidation processes.

[0063] Advanced oxidation is the process of producing highly oxidative reactive oxygen species, such as hydroxyl radicals (·OH), hydrogen peroxide (H2O2), superoxide anion radicals (·O2 - ), singlet oxygen ( 1 O2), etc., to directly mineralize organic pollutants or improve their biodegradability. This technology has the advantages of strong oxidation ability, high treatment efficiency and simple operation.

[0064] Among many advanced oxidation processes, Fe 2+ The Fenton reaction, which catalyzes H2O2 to produce ·OH, is a typical advanced oxidation process that is green, efficient, and energy-saving. The core of the Fenton-like reaction is to use a series of catalysts to trigger the break of the oxygen-oxygen single bond in H2O2 to produce hydroxyl radicals (·OH), thereby degrading organic pollutants.

[0065] Cu in composite oxide materials 2+ , Mn produced by potassium permanganate reaction 2+ , Fe 2+ It produces a synergistic activation effect on H2O2, enhances the production of ·OH, and improves the removal efficiency of pollutants.

[0066] The present invention uses potassium permanganate as an oxidant, and its oxidizing ability is stronger under acidic conditions. This is because there are a large number of hydrogen ions (H + ), these hydrogen ions have a strong reverse polarization effect, which can weaken the Mn-O bond and thus increase the MnO 4-In addition, the electrode potential of potassium permanganate is higher under acidic conditions, which is one of the reasons for its enhanced oxidizability. When the pH value of potassium permanganate is lower than 7, potassium permanganate will turn into tetravalent manganese with less oxidizability, so that its solubility will decrease. This characteristic allows potassium permanganate to carry out oxidation reactions more persistently under specific pH conditions.

[0067] In addition to the features of the above embodiments, the present embodiment further defines: the preset pH value range is 3-4. By setting the preset pH value range to 3-4, the decomposition reaction of hydrogen peroxide is more likely to proceed in the direction of generating hydroxyl radicals (·OH). Hydroxyl radicals have extremely strong oxidizing properties and can react quickly with organic pollutants in the air, and have high air purification efficiency. The reaction conditions of potassium permanganate are controlled at pH = 3-4, and its sustained release rate can also be controlled by adjusting the pH value to adapt to odor purification under different working conditions and maintain longer reaction efficiency.

[0068] like Figure 3 As shown, in addition to the features of the above embodiment, this embodiment further defines: the specific steps of step S23 are as follows: S231, setting the degree to be set as intermittent spraying of oxidizing liquid; S232, detecting the concentration of pollutants in the air; S233, when it is detected that the concentration of pollutants in the air is higher than the preset value, adjusting the purification device to spray the oxidizing liquid with the first spray frequency and the first spray intensity; S234, when it is detected that the concentration of pollutants in the air is lower than the preset value, adjusting the purification device to spray the oxidizing liquid with the second spray frequency and the second spray intensity; the first spray frequency is greater than the second spray frequency, and the first spray intensity is greater than the second spray intensity. By detecting the concentration of pollutants in the air to adjust the spray efficiency and the spray intensity, it can be ensured that sufficient spraying can be achieved when the concentration of pollutants is high, thereby achieving a better air purification effect; when the concentration of pollutants is lower than the preset value, a lower spray frequency and the second spray intensity are used. In this way, excessive use of oxidizing liquid can be avoided when the air quality is good, and the waste of chemical reagents such as hydrogen peroxide and dilute sulfuric acid is reduced, thereby reducing the purification cost, and also reducing the amount of chemical waste liquid generated, which meets the requirements of environmental protection and sustainable development.

[0069] Implementation case 1:

[0070] The composite oxidation material of the present invention is filled in a specific air purifier, and a dilute sulfuric acid + hydrogen peroxide solution is prepared, the solution pH is 3-4, and a timed spray mode is set.

[0071] Equipped with a machine to handle air volume of 1000m 3 / h, 10L air purification unit, placed in a newly decorated room with obvious formaldehyde smell, the room was sealed for 48 hours. The air purification unit was placed in the living room, the circulating fan was turned on to ensure air flow, and the doors and windows were kept closed during the purification process. After the air purifier was running for a period of time, the formaldehyde concentration in the living room was monitored again. The test results showed that the purification effect was very good.

[0072] The test results were tested using the Honeywell Formaldehyde Monitor PRO. The results are as follows:

[0073] Before purification After 24 hours of purification After 48 hours of purification HCHO formaldehyde concentration <![CDATA[>0.25mg / m 3 ]]> <![CDATA[<0.08mg / m 3 ]]> <![CDATA[<0.02mg / m 3 ]]> Pollution degree description Severe pollution Good air Excellent air quality

[0074] Implementation case 2:

[0075] Equipped with a machine to handle air volume of 3000m 3 / h, an air purification unit with a capacity of 25L is placed in a kitchen waste temporary storage room. The relative humidity in a semi-closed state is 55-70%, and the odor concentration is 8750 (dimensionless). The purification unit is turned on and the automatic spray mode is set. Through the double composite oxidation technology, the odor concentration in the temporary storage room is reduced to <50 (dimensionless), achieving a better air purification effect.

[0076] Implementation case three:

[0077] Eliminate odorous waste gas from the sewage station pump room, gas volume 5000m 3 / h, mainly containing ammonia, hydrogen sulfide, and amine odor components, with an odor concentration of about 500 (dimensionless). The composite oxidation filter material of the present invention is filled in a specific purification device, and the exhaust gas is introduced through a fan, the gas temperature is 27°C, the relative humidity is 66%, and the residence time is 5s. The purification device starts the timed spray mode and sprays the acidic oxidizing liquid uninterruptedly. The oxidant is continuously and stably released through the dual oxidation process to oxidize and decompose the odor molecules. The final odor concentration value at the outlet of the purification device is less than 35 (dimensionless), achieving ultra-clean emission of odorous exhaust gas.

[0078] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A production process for air purification filter material, characterized in that: The steps include: S11, adding copper oxide and iron powder in proportion to diatomaceous earth of the first particle size to obtain diatomaceous earth loaded with metal oxides, and stirring the diatomaceous earth loaded with metal oxides by a drum for a first set time; S12, in a horizontal ball mill, using aluminum oxide balls of a first particle size as a grinding medium, mixing potassium permanganate powder and aluminum oxide balls in a certain weight ratio to obtain a first mixture, ball-milling the first mixture for a second set time, and separating the aluminum oxide balls after the ball milling to obtain potassium permanganate powder with an average particle size of a second particle size; S13, mixing potassium permanganate powder of a second particle size and polyethylene of a second particle size into the diatomaceous earth loaded with metal oxides according to a ratio, and mixing them evenly to obtain a second mixture; S14, adding clay to the second mixture to obtain a third mixture, and kneading for a third set time under a set stirring speed, so that the third mixture is stirred and formed into balls, thereby forming rough filter material balls; S15, drying the rough filter material ball at a set temperature for a fourth set time, during which the polyethylene melts to form pores inside the rough filter material ball, and after natural cooling, the air purification filter material is obtained.

2. The production process of air purification filter material according to claim 1, characterized in that: The first particle size is 350-500 mesh; and / or the second particle size is 1000 mesh; and / or the first particle size is 3-5 mm; and / or the second particle size is 2-3 μm; And / or the stirring speed is set to 4000r / min.

3. The production process of air purification filter material according to claim 1, characterized in that: The first setting time is 1-2h; And / or the second set time is 2-3h; And / or the third set time is 50-80 minutes; And / or the fourth set time is 2-3h; And / or the set temperature is 200-220°C.

4. An air purification filter material, produced by the production process of air purification filter material according to any one of claims 1 to 3, characterized in that: The components of the air purification filter material include: potassium permanganate; diatomite; clay; Iron powder; Copper oxide; Polyethylene.

5. The air purification filter material according to claim 4, characterized in that: The air purification filter material has the following components by mass percentage: The content of potassium permanganate is 60-80wt%; The content of diatomaceous earth is 10-15wt%; The content of the clay is 5-10wt%; The content of the iron powder is 5-10wt%; The content of copper oxide is 3-8wt%; The content of the polyethylene is 0.5-1 wt%.

6. The air purification filter material according to claim 4, characterized in that: The air purification filter material is a porous structure, the porosity of the air purification filter material is 40-60%, the particle size is 3-6mm, and the stacking strength is ≥200N / particle.

7. A purification device, characterized in that: include: Purification structure; The air purification filter material according to any one of claims 4 to 6, wherein the air purification filter material is used to fill the purification structure.

8. A double purification method, applied to the purification device as claimed in claim 7, characterized in that: The steps include: S21, preparing an oxidizing solution by using hydrogen peroxide and dilute sulfuric acid, and adjusting the oxidizing solution to a preset pH value range; S22, filling the air purification filter material into the purification structure; S23. Spray oxidizing liquid on the air purification filter material and adjust the spraying frequency and spraying intensity according to the working conditions.

9. The double purification method according to claim 8, characterized in that: The preset pH value range is 3-4.

10. The double purification method according to claim 8, characterized in that: The specific steps of step S23 are as follows: S231, setting the degree to the program setting to intermittent spraying of oxidation liquid; S232, detect the concentration of pollutants in the air; S233, when it is detected that the concentration of pollutants in the air is higher than a preset value, adjusting the purification device to spray the oxidizing liquid at a first spraying frequency and a first spraying intensity; S234, when it is detected that the concentration of pollutants in the air is lower than a preset value, adjusting the purification device to spray the oxidizing liquid at a second spraying frequency and a second spraying intensity; The first spraying frequency is greater than the second spraying frequency, and the first spraying intensity is greater than the second spraying intensity.

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