Preparation method of quincunx tubular light porcelain microporous filter cartridge

Abstract

The invention relates to the technical field of preparation of ceramic microporous filter cartridges, in particular to a preparation method of a quincunx tubular light porcelain microporous filter cartridge, which comprises the following steps: preparing mixed powder from light porcelain clay, dolomitic sand, glass sand, bamboo powder and clay; a plastic adhesive is prepared from liquid aluminum dihydrogen phosphate, silica sol, sesbania gum powder, hydroxypropyl methyl cellulose, a binding agent and purified water; the mixed powder and a plastic adhesive are mixed into green body pug; carrying out circular mulling and aging treatment on the green body pug; extruding, cutting and shaping to obtain a single-tube green body; sintering a single-tube green body, cooling and then cutting at fixed length; spraying a functional coating on the outer surface of the single pipe, sintering and curing; arranging and assembling a plurality of single tubes into a filter cartridge with a quincunx tube array structure; a filter cartridge end cover is sealed by glue filling; and detecting the filtering performance of the filter cartridge. The method has the remarkable effects that the filtering area is maximized, and the efficiency is improved; light weight, high strength and convenient installation and maintenance; the service life is long; the energy-saving and emission-reducing effects are good; the adhesion resistance is high; the assembly is flexible, and the sealing performance is good.

Description

Technical Field

[0001] This invention relates to the field of ceramic microporous filter cartridge preparation technology, specifically to a method for preparing a plum blossom-shaped tubular lightweight ceramic microporous filter cartridge. Background Technology

[0002] In the field of ceramic microporous filter cartridges used for integrated high-temperature dust removal and denitrification, existing filter cartridges have many performance defects, as follows: Sintered plastic filter plates: These are microporous filter plates made primarily of ultra-high molecular weight polyethylene (UHMWPE) and sintered using a molding process. Their operating temperature is limited to environments below 70℃, and they lack denitrification capabilities. Furthermore, there is a risk of system fire caused by static electricity, which significantly restricts their application in high-temperature and flammable / explosive conditions.

[0003] Traditional silicon carbide and alumina microporous filter tubes have a large unit volume weight, which increases the overall weight of the filter and makes installation and transportation inconvenient. At the same time, the ratio of filtration area to volume is small, which means that a larger filter is required to meet the same processing capacity requirements, increasing the equipment footprint and cost.

[0004] Three-dimensional honeycomb ceramic microporous filter cartridges also suffer from the problem of large weight per unit volume, small inlet and outlet area, limited space for pulse backflushing cleaning, and easy filtration area to be clogged with dust. This makes this type of filter cartridge only suitable for low flow rate, low dust content and fine particle size conditions, and cannot meet the needs of high flow rate and high dust content conditions.

[0005] Ceramic fiber microporous filter tubes: large volume and small filtration area, resulting in low filtration efficiency, low strength, poor moisture resistance, easy damage in humid environments, and reduced service life; in addition, they are not sintered and vitrified at high temperature, and belong to volumetric dust-holding filters, resulting in unstable filtration effect, making it difficult to meet the working conditions with high requirements for filtration accuracy and efficiency.

[0006] In summary, existing filter cartridges have significant shortcomings in terms of filtration performance, physical properties, and adaptability to operating conditions, and cannot meet the demand for efficient, stable, and widely applicable filter cartridges in the field of integrated high-temperature dust removal and denitrification technologies using ceramic microporous filter cartridges.

[0007] Therefore, developing a new method for preparing filter cartridges that can overcome the above-mentioned defects is of great practical significance. Summary of the Invention

[0008] To address the aforementioned issues, this invention provides a method for preparing a plum blossom-shaped tubular lightweight ceramic microporous filter cartridge. This method offers significant advantages: maximized filtration area and improved efficiency; lightweight yet high-strength design facilitates installation and maintenance; long lifespan and high filtration efficiency; excellent energy-saving and emission-reduction effects; strong anti-adhesion properties; flexible assembly and good sealing; and all indicators meet national standards, ensuring product quality and performance.

[0009] The technical solution of the present invention is as follows: The preparation method of the plum blossom-shaped tubular lightweight ceramic microporous filter cartridge includes the following steps: S1. Prepare a mixed powder using lightweight kaolin, dolomite sand, glass sand, bamboo powder and clay; S2. A plastic adhesive is prepared using liquid aluminum dihydrogen phosphate, silica sol, guar gum powder, hydroxypropyl methylcellulose, binder, and purified water; S3. Mix the mixed powder prepared in step S1 with the plastic binder in step S2 to make green clay material; S4. The raw clay material is subjected to cyclic mixing and aging treatment; S5. Extrude the aged clay material through a plum blossom-shaped mold and cut it into a single-tube green body; S6. Sinter a single-tube green body, cool and then cut to a fixed length; S7. Spray a functional coating onto the outer surface of the single tube and sinter and cure it; S8. A filter cartridge with multiple single tubes arranged and assembled into a plum blossom-shaped tube structure; S9. Filter cartridge end cap is sealed with adhesive; S10. Test the filtration performance of the filter cartridge.

[0010] In step S1, the mixed powder comprises, by mass parts: Lightweight kaolin clay, 32.25–36.75 parts; 18-25 parts of dolomite; Glass frit 8.5–12.5 parts; Bamboo powder 3.5–5.0 parts; 4.6 to 6.7 parts clay.

[0011] 3. The method for preparing the plum blossom-shaped tubular lightweight ceramic microporous filter cartridge according to claim 2, characterized in that the lightweight ceramic clay has a particle size of 300-320 mesh; Dolomite grain size: 180-200 mesh; Glass sand particle size 150-200 mesh; Bamboo powder particle size: 140-180 mesh; The clay particle size is 280 to 320 mesh.

[0012] In step S2, the plastic adhesive comprises, by weight parts: Liquid aluminum dihydrogen phosphate, 7.8–8.9 parts; 2.00–3.50 parts of silica sol; Guess gum powder 1.35–1.85 parts; Hydroxypropyl methylcellulose 3.2–3.8 parts; 2.36–2.95 parts of binder 15-20 parts purified water.

[0013] Step S3 includes: mixing 45.0 to 47.50 parts of the mixed powder prepared in S1 and 18.00 to 23.00 parts of the plastic adhesive prepared in S2 by mass to obtain mixed green clay material.

[0014] Step S4 includes: mixing the raw clay at 100 rpm for 30 minutes and stopping for 5 minutes, repeating the process 3 times, and then aging for 36 hours.

[0015] The sintering process in step S6 is as follows: the temperature is raised from room temperature to 110℃ in 30 minutes at a rate of 2.83℃ / min; held for 20 minutes; the temperature is raised to 240℃ in 35 minutes at a rate of 3.71℃ / min; held for 20 minutes; the temperature is raised to 450℃ in 60 minutes at a rate of 3.50℃ / min; held for 25 minutes; the temperature is raised to 1155℃ in 90 minutes at a rate of 7.83℃ / min; held for 60 minutes; the temperature is lowered to 600℃ in 80 minutes at a rate of 6.94℃ / min; held for 20 minutes; the temperature is lowered to 300℃ in 45 minutes at a rate of 6.67℃ / min; held for 30 minutes; and then cooled to room temperature in the furnace.

[0016] Step S7 includes: Spray a vanadium-titanium-based denitrification coating with a thickness of 0.15–0.20 mm and sinter at 340 °C for 45 min; Alternatively, electrostatic spraying can be used to apply a PTFE micro powder coating with a particle size of 3–5 μm and a thickness of 0.15–0.20 mm, followed by sintering at 210℃ for 20 min.

[0017] Step S8 includes: assembling 22 single tubes into a Φ150mm×5mm stainless steel end cap and fastening them into a Φ150mm×1500mm circular filter cartridge, or assembling 36 single tubes into a 485mm×50mm stainless steel end cap and fastening them into a 1500mm×485mm×50mm flat filter cartridge.

[0018] Step S10 is tested according to GB / T14295-2019 standard, with the following requirements: filtration accuracy ≤0.3μm, filtration efficiency ≥99.9%, initial resistance ≤500Pa, and denitrification efficiency ≥95%.

[0019] The beneficial effects of this invention are as follows: 1. The present invention discloses a method for preparing a plum blossom-shaped tubular lightweight ceramic microporous filter cartridge. This method maximizes the filtration area of ​​the filter cartridge by adopting a single-tube plum blossom-shaped cross-section design and a tubular combination design. Under the premise of the same volume, the filtration area of ​​the plum blossom-shaped tubular lightweight ceramic microporous gas and liquid circular filter cartridge is 4.5 times that of the ceramic fiber microporous filter tube, which significantly improves the filtration efficiency.

[0020] 2. The method for preparing the plum blossom-shaped tubular lightweight ceramic microporous filter cartridge disclosed in this invention uses lightweight and high-strength lightweight ceramic materials. Under the same volume, the weight of the plum blossom-shaped tubular lightweight ceramic microporous gas and liquid filter cartridge is 1 / 2 of that of the three-dimensional honeycomb ceramic microporous filter cartridge and 1 / 3 of that of the silicon carbide and alumina microporous filter tube, which reduces the overall weight of the equipment and facilitates installation and maintenance.

[0021] 3. The method for preparing the plum blossom-shaped tubular lightweight ceramic microporous filter cartridge disclosed in this invention can continuously remove dust and denitrify for 6 to 8 years, and its service life is more than 1.5 times that of silicon carbide and alumina microporous filter cartridges. At the same time, the filtration accuracy, filtration efficiency and denitrification efficiency are significantly higher than those of various filters in the background technology, providing more reliable filtration performance.

[0022] 4. The preparation method of the plum blossom-shaped tubular lightweight ceramic microporous filter cartridge disclosed in this invention achieves a porosity of over 55% and an initial resistance of ≤500Pa by optimizing the raw material formula and sintering process technology, which is significantly lower than various filters in the background technology, thus achieving a significant high-efficiency energy saving and emission reduction effect.

[0023] 5. The preparation method of the plum blossom-shaped tubular lightweight ceramic microporous filter cartridge disclosed in this invention adopts electrostatic spraying PTFE micro powder technology, which completely solves the difficult problem of high viscosity of gas and liquid filtration media and easy clogging of the filter cartridge surface, and improves the anti-adhesion and service life of the filter cartridge.

[0024] 6. The method for preparing the plum blossom-shaped tubular lightweight ceramic microporous filter cartridge disclosed in this invention allows the filter cartridge to be assembled into a circular or flat shape as needed to meet the usage requirements under different working conditions. At the same time, the end caps of the filter cartridge are sealed with glue to ensure good sealing performance, prevent leakage, and improve the stability and reliability of the equipment.

[0025] 7. The preparation method of the plum blossom-shaped tubular lightweight ceramic microporous filter cartridge disclosed in this invention is tested according to GB / T14295-2019 standard. The filtration accuracy, filtration efficiency, initial resistance and denitrification efficiency of the plum blossom-shaped tubular lightweight ceramic microporous gas and liquid filter cartridge all meet or exceed the standard requirements, ensuring the quality and performance of the product. Attached Figure Description

[0026] The solutions and advantages of this application will become clear to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention.

[0027] In the attached diagram: Figure 1This is a flowchart illustrating the preparation method of the plum blossom-shaped tubular lightweight ceramic microporous filter cartridge according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the plum blossom-shaped single-tube light ceramic green extrusion die used in the preparation method of the plum blossom-shaped tubular light ceramic microporous filter cartridge of this invention. Figure 3 The sintering heating process curve of the preparation method of the plum blossom-shaped tubular lightweight ceramic microporous filter cartridge according to an embodiment of the present invention; Figure 4 A front view of a circular filter cartridge produced by the preparation method of the plum blossom-shaped tubular lightweight ceramic microporous filter cartridge according to an embodiment of the present invention; Figure 5 A top view of a circular filter cartridge produced by the method for preparing a plum blossom-shaped tubular lightweight ceramic microporous filter cartridge according to an embodiment of the present invention; Figure 6 This is a three-dimensional structural diagram of the flat filter cartridge produced by the preparation method of the plum blossom-shaped tubular lightweight ceramic microporous filter cartridge according to an embodiment of the present invention. Detailed Implementation

[0028] like Figure 1 As shown, the preparation method of the plum blossom-shaped tubular lightweight ceramic microporous filter cartridge includes the following steps: S1: Preparation of mixed powder; S2: Preparation of plastic adhesives; S3: Prepare mixed green clay material; S4: Mixed and aged raw clay; S5: Extruded single-tube green preform; S6: High-temperature sintering of single-tube green bodies; S7: Single-pipe spraying, low-temperature sintering and solidification coating; S8: Assemble a plum blossom-shaped tubular lightweight ceramic microporous gas and liquid filter cartridge; S9: Filter cartridge end cap is sealed with adhesive; S10: Test the filtration performance of the filter cartridge.

[0029] Furthermore, in S1, a mixed powder is prepared, including the following raw materials: lightweight kaolin, dolomite sand, glass sand, bamboo powder, and clay.

[0030] in: Take 32.25 to 36.75 parts by weight of lightweight kaolin clay with a particle size of 300 to 320 mesh; Take 18 to 25 parts by weight of dolomite with a particle size of 180 to 200 mesh; Take 8.5 to 12.5 parts by weight of glass sand with a particle size of 150 to 200 mesh; Take 3.5 to 5.0 parts by weight of bamboo powder with a particle size of 140 to 180 mesh; Take 4.6 to 6.7 parts by weight of clay with a particle size of 280 to 320 mesh; The above-mentioned powder raw materials are placed in a three-dimensional powder mixer and stirred for 24 minutes to obtain the desired mixed powder.

[0031] Furthermore, in S2, a plastic adhesive is prepared, comprising the following raw materials: liquid aluminum dihydrogen phosphate, silica sol, guar gum powder, hydroxypropyl methylcellulose, binder, and purified water.

[0032] in: Take 7.8 to 8.9 parts by weight of liquid aluminum dihydrogen phosphate; Take 2.00 to 3.50 parts of silica sol by weight; Take 1.35 to 1.85 parts by weight of guar gum powder; Take 3.2 to 3.8 parts by weight of hydroxypropyl methylcellulose; Take 2.36 to 2.95 parts by weight of binder, with a particle size of 180 mesh; Take 15 to 20 parts of purified water by weight; Add the above raw materials to an electrically heated enamel-lined reactor, start the anchor stirrer, and heat to 97°C while stirring at a stirring speed of 90 rpm. Keep stirring at this temperature for 5 minutes to obtain the desired plastic adhesive.

[0033] Furthermore, in S3, the mixed green clay material is prepared, including the following raw materials: the mixed powder prepared in S1 and the plastic adhesive prepared in S2.

[0034] in: Take 45.0 to 47.50 parts by weight of the mixed powder prepared by S1; Take 18.00 to 23.00 parts by weight of the plastic adhesive prepared by S2; Place the above raw materials into a ceramic clay mixer, start the mixer, and mix at a speed of 100 rpm for 35 minutes to obtain the required mixed green clay.

[0035] Furthermore, in S4, the mixing and aging of the green clay includes: mixing the mixed green clay obtained in S3 in a ceramic clay mixer at a speed of 100 rpm for 30 minutes, stopping for 5 minutes, repeating the mixing process three times, and then aging it in an aging tank for 36 hours, thus completing the mixing and aging of the green clay.

[0036] Furthermore, in S5, the extrusion of a single-tube green body includes: loading the mixed and aged green body clay from S4 into the feed hopper of a J100 type ceramic vacuum spiral green body extruder, and then... Figure 2The plum blossom-shaped single-tube lightweight ceramic green body extrusion die shown is installed on the die head of the ceramic vacuum spiral green body extruder. A 2000mm long special green body receiver is installed in front of the green body outlet of the ceramic vacuum extruder and kept horizontal. The ceramic vacuum green body extruder is started. When the length of the extruded plum blossom-shaped single-tube lightweight ceramic green body reaches 1650mm, the green body is neatly cut to a fixed length using an arc-shaped fine steel wire cutter. The green body is then received with a V-groove, removed, and placed on a drying angle iron rack to air dry naturally, thus obtaining a plum blossom-shaped cross-section single-tube lightweight ceramic green body.

[0037] Furthermore, in S6, the high-temperature sintering and forming of single-tube green billets includes: neatly arranging dried, plum-blossom-shaped cross-section single-tube green billets with high initial strength in the sintering kiln, closing the kiln door, and then... Figure 3 The sintering heating process curve shown is as follows: The temperature is increased from room temperature to 110℃ in 30 min at a heating rate of 2.83℃ / min; held for 20 min; then increased to 240℃ in 35 min at a heating rate of 3.71℃ / min; held for 20 min; then increased to 450℃ in 60 min at a heating rate of 3.50℃ / min; held for 25 min; then increased to 1155℃ in 90 min at a heating rate of 7.83℃ / min; held for 60 min; then decreased to 600℃ in 80 min at a cooling rate of 6.94℃ / min; held for 20 min; and finally decreased at a cooling rate of 6.67℃ / min. After 45 minutes, the temperature is lowered to 300℃; the temperature is held for 30 minutes; the temperature is then cooled to room temperature in the furnace to complete the sintering and forming of the plum blossom-shaped cross-section single-tube microporous filter tube; when the temperature inside the sintering kiln drops to 180℃, the kiln door is opened; when the temperature of the plum blossom-shaped cross-section lightweight ceramic microporous filter tube inside the kiln drops to 30℃, the plum blossom-shaped cross-section lightweight ceramic microporous filter tube is taken out of the kiln, and its two ends are aligned to a fixed length of 1510mm using a diamond cutting saw, and it is then placed upright in the designated area.

[0038] Furthermore, in S7, the single-pipe spraying and low-temperature sintering bonding coating includes: Optionally, depending on the technical requirements of the operating conditions, the prepared vanadium-titanium-based denitrification spray solution is evenly sprayed onto the outer surface of the plum blossom-shaped cross-section light ceramic microporous air filter tube using a pneumatic spray gun, with a coating thickness of 0.15 to 0.20 mm, and then allowed to air dry naturally at room temperature. Optionally, depending on the technical requirements of the operating conditions, DTFE food-grade micro powder with a particle size of 3 to 5 can be uniformly sprayed onto the outer surface of the plum blossom-shaped cross-section lightweight ceramic microporous gas and liquid filter tube using electrostatic spraying, with a coating thickness of 0.15 to 0.20 mm.

[0039] The plum blossom-shaped cross-section light ceramic microporous gas and liquid filter tubes coated with denitrification catalyst spray liquid or PTFE micro powder were placed in their respective kilns. After the temperature was raised to 340℃ and 210℃ respectively, they were kept at the temperature for 45 minutes and 20 minutes respectively. After cooling to room temperature with the furnace, they were taken out and placed in their respective designated areas.

[0040] Furthermore, in S8, the assembly and positioning of the plum blossom-shaped cross-section lightweight ceramic microporous gas and liquid filter cartridge includes: Optional, by Figure 4 and Figure 5 As shown, 22 plum blossom-shaped cross-section lightweight ceramic microporous filter tubes are arranged in the upper and lower end caps made of 304 stainless steel with a diameter of 150mm × 5mm. Four φ6mm 304 stainless steel tie rods are used to fix the tubes in place by tightening the bolts at both ends of the tie rods. This creates a circular plum blossom cross-section tubular lightweight ceramic microporous gas and liquid filter cartridge with a diameter of 150mm, a height of 1500mm, and a top end cap flange of φ200mm.

[0041] Optional, by Figure 6 As shown, 36 plum blossom-shaped cross-section lightweight ceramic microporous gas and liquid filter tubes are arranged in the upper and lower end caps made of 304 stainless steel, measuring 485mm×50mm. They are positioned and fastened by the fastening bolts between the basket and the upper end cap of the basket, forming a flat plum blossom cross-section tubular lightweight ceramic microporous gas and liquid filter cartridge with a height of 1500mm, a width of 485mm, a thickness of 50mm, and an upper end cap flange of 563mm×80mm.

[0042] Furthermore, in S9, the glue-sealing of the filter cartridge end caps includes: according to the technical process requirements of the operating conditions, Optionally, a sealant with good fluidity, high bonding and sealing strength, and continuous use at 450℃ can be used. The upper and lower end caps of the circular and flat tubular lightweight ceramic microporous gas and liquid filter cartridges are filled with the sealant and allowed to cure at room temperature to achieve the ideal sealing and bonding strength. This produces a circular or flat plum blossom tubular lightweight ceramic microporous gas and liquid filter cartridge capable of continuous dust removal and denitrification under 450℃ high-temperature conditions.

[0043] Optionally, a food-grade environmentally friendly sealing adhesive with good fluidity and high bonding strength can be used to fill the upper and lower end caps of the round and flat tubular lightweight ceramic microporous gas and liquid filter cartridges. After curing at room temperature to achieve the ideal sealing and bonding strength, round and flat plum blossom tubular lightweight ceramic microporous gas and liquid filter cartridges can be made that can be continuously used in pharmaceutical, biochemical synthesis, electronics, food processing and other fields under food-grade environmental protection conditions.

[0044] Furthermore, in S10, the filter cartridge filtration performance is tested according to the national standard GB / T14295-2019, for plum blossom-shaped tubular lightweight ceramic microporous gas and liquid filter cartridges: filtration accuracy ≤0.3μm, filtration efficiency ≥99.9%, initial resistance ≤500Pa, denitrification efficiency ≥95%. After passing the test, the cartridges are packaged and stored for shipment.

Claims

1. A method for preparing a plum blossom-shaped tubular lightweight ceramic microporous filter cartridge, characterized in that, Includes the following steps: S1. Prepare a mixed powder using lightweight kaolin, dolomite sand, glass sand, bamboo powder and clay; S2. A plastic adhesive is prepared using liquid aluminum dihydrogen phosphate, silica sol, guar gum powder, hydroxypropyl methylcellulose, binder, and purified water; S3. Mix the mixed powder prepared in step S1 with the plastic binder in step S2 to make green clay material; S4. The raw clay material is subjected to cyclic mixing and aging treatment; S5. Extrude the aged clay material through a plum blossom-shaped mold and cut it into a single-tube green body; S6. Sinter a single-tube green body, cool and then cut to a fixed length; S7. Spray a functional coating onto the outer surface of the single tube and sinter and cure it; S8. A filter cartridge with multiple single tubes arranged and assembled into a plum blossom-shaped tube structure; S9. Filter cartridge end cap is sealed with adhesive; S10. Test the filtration performance of the filter cartridge.

2. The method for preparing the plum blossom-shaped tubular lightweight ceramic microporous filter cartridge according to claim 1, characterized in that, In step S1, the mixed powder comprises, by mass parts: Lightweight kaolin clay, 32.25–36.75 parts; 18-25 parts of dolomite; Glass frit 8.5–12.5 parts; Bamboo powder 3.5–5.0 parts; 4.6 to 6.7 parts clay.

3. The method for preparing the plum blossom-shaped tubular lightweight ceramic microporous filter cartridge according to claim 2, characterized in that, Lightweight kaolin with a particle size of 300–320 mesh; Dolomite grain size: 180-200 mesh; Glass sand particle size 150-200 mesh; Bamboo powder particle size: 140-180 mesh; The clay particle size is 280 to 320 mesh.

4. The method for preparing the plum blossom-shaped tubular lightweight ceramic microporous filter cartridge according to claim 1, characterized in that, In step S2, the plastic adhesive comprises, by weight parts: Liquid aluminum dihydrogen phosphate, 7.8–8.9 parts; 2.00–3.50 parts of silica sol; Guess gum powder 1.35–1.85 parts; Hydroxypropyl methylcellulose 3.2–3.8 parts; 2.36–2.95 parts of binder 15-20 parts purified water.

5. The method for preparing the plum blossom-shaped tubular lightweight ceramic microporous filter cartridge according to claim 1, characterized in that, Step S3 includes: mixing 45.0 to 47.50 parts of the mixed powder prepared in S1 and 18.00 to 23.00 parts of the plastic adhesive prepared in S2 by mass to obtain mixed green clay material.

6. The method for preparing the plum blossom-shaped tubular lightweight ceramic microporous filter cartridge according to claim 1, characterized in that, Step S4 includes: mixing the raw clay at 100 rpm for 30 minutes and stopping for 5 minutes, repeating the process 3 times, and then aging for 36 hours.

7. The method for preparing the plum blossom-shaped tubular lightweight ceramic microporous filter cartridge according to claim 1, characterized in that, The sintering process in step S6 is as follows: the temperature is increased from room temperature to 110℃ in 30 minutes at a rate of 2.83℃ / min; held for 20 minutes; the temperature is increased to 240℃ in 35 minutes at a rate of 3.71℃ / min; held for 20 minutes; the temperature is increased to 450℃ in 60 minutes at a rate of 3.50℃ / min; and held for 25 minutes. The temperature was increased to 1155℃ at a heating rate of 7.83℃ / min for 90 min and held for 60 min; then the temperature was decreased to 600℃ at a cooling rate of 6.94℃ / min for 80 min and held for 20 min; finally, the temperature was decreased to 300℃ at a cooling rate of 6.67℃ / min for 45 min and held for 30 min; and then cooled to room temperature with the furnace.

8. The method for preparing the plum blossom-shaped tubular lightweight ceramic microporous filter cartridge according to claim 1, characterized in that, Step S7 includes: Spray a vanadium-titanium-based denitrification coating with a thickness of 0.15–0.20 mm and sinter at 340 °C for 45 min; Alternatively, electrostatic spraying can be used to apply a PTFE micro powder coating with a particle size of 3–5 μm and a thickness of 0.15–0.20 mm, followed by sintering at 210℃ for 20 min.

9. The method for preparing the plum blossom-shaped tubular lightweight ceramic microporous filter cartridge according to claim 1, characterized in that, Step S8 includes: assembling 22 single tubes into a Φ150mm×5mm stainless steel end cap and fastening them into a Φ150mm×1500mm circular filter cartridge, or assembling 36 single tubes into a 485mm×50mm stainless steel end cap and fastening them into a 1500mm×485mm×50mm flat filter cartridge.

10. The method for preparing the plum blossom-shaped tubular lightweight ceramic microporous filter cartridge according to claim 1, characterized in that, Step S10 is tested according to GB / T14295-2019 standard, with the following requirements: filtration accuracy ≤0.3μm, filtration efficiency ≥99.9%, initial resistance ≤500Pa, and denitrification efficiency ≥95%.

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