Process for the production of a building ceramic by wet milling

Abstract

The application discloses a building ceramic wetting powder preparation process and belongs to the technical field of building ceramic production. The process comprises the following steps: step 1, dry powder particle preparation; step 2, uniform wetting of the dry powder particles by using a wetting tower to obtain micro-agglomerated powder; step 3, post-tower coarse screening of the micro-agglomerated powder; step 4, uniformization and powder activation of the post-tower coarse screened micro-agglomerated powder by using a powder activation bin; step 5, post-activation medium screening of the uniformized and activated micro-agglomerated powder; step 6, pre-pressing fine screening of the post-activation medium screened micro-agglomerated powder to obtain powder material for molding; and step 7, embryo molding, drying and sintering of the powder material for molding. The building ceramic wetting powder preparation process adopts the above structure, completely discards the 'granulation' link regarded as inevitable in the traditional process, instead adopts a physical path of 'direct wetting of fine powder', and realizes a fundamental breakthrough in powder performance and production energy consumption.

Description

Technical Field

[0001] This invention belongs to the field of building ceramics production technology, and in particular relates to a wetting and powdering process for building ceramics. Background Technology

[0002] Architectural ceramic powder specifically refers to powdered materials that are systematically prepared and meet various process requirements before entering the pressing and molding process. It is not only the starting point of ceramic production but also the core material basis that determines the final product's performance, quality, and production cost. Its crucial position and the severity of the challenges it faces directly impact the sustainable development capability of the entire industry.

[0003] Currently, the wet powder-making process, widely used in the building ceramics industry, yields high-performance powders, but at the cost of high energy consumption, high water consumption, and high emissions. The core equipment in wet powder-making—the spray drying tower—requires a large amount of natural gas or coal to evaporate approximately 33%-35% of the water in the slurry, forming granular powder with a "hard shell and soft core" structure. This powder-making stage accounts for 30%-40% of the total energy consumption of the production line. With the deepening of the national "dual-carbon" strategy, increasingly stringent energy consumption control policies, and continuously improving environmental standards, the inherent "three highs" (high energy consumption, high water consumption, and high emissions) of wet powder-making have become a heavy constraint on the industry's green and sustainable development, and its technological path faces the historical fate of being surpassed.

[0004] To address this challenge, the building ceramics industry has actively promoted energy-saving and environmentally friendly dry powder production processes. For over two decades, the industry has developed various dry process routes, including stirring granulation, suspension granulation, and clay-rolling granulation, and has continuously promoted and tested them. However, regrettably, all these dry process technologies have failed to overcome a fundamental flaw: they cannot achieve or even approach the process effects and product quality of wet powder production. In-depth analysis shows that the aforementioned dry processes are essentially all "granulation" processes—that is, using water as a binder to mechanically "wrap" or "bind" dry mineral powder into granular powder with a certain particle size. This granulation mechanism leads to a key structural problem: the particles form a dense "core," while the outer surface is relatively rough and loose. This "core-shell" structure brings a series of chain problems: in the pressing and molding stage, these particles are difficult to achieve sufficient "initial pressing pulverization" during the press process; the dense core leads to uneven stress transmission within the green body, resulting in large density differences in the pressed green body, making it prone to delamination and micro-cracks, leading to a high breakage rate in subsequent processes. During the drying and firing stages, the difficulty in draining moisture from the core of the particles leads to a significant moisture gradient within the green body. This uneven moisture distribution results in a mismatch between drainage rate and shrinkage behavior during drying and firing, causing frequent defects such as deformation and cracking. Consequently, the product yield has consistently lagged behind that of wet-process methods. This reveals a more fundamental principle: both wet and dry milling processes aim to process powder into "granular powder." The only difference lies in the fact that wet-process granular powder can undergo a longer aging process, allowing for some release and homogenization of internal and external stresses, thus partially meeting pressing requirements. In contrast, dry-process granular powder, due to its dense core structure, retains moisture within the particles, making effective drainage impossible even after aging. This prevents fundamental improvement in the particle structure defects. This is the root cause of the persistent difficulties faced by traditional dry milling technology for over two decades.

[0005] In conclusion, the high energy consumption of wet powder production and the structural defects of dry powder production both stem from the inherent limitations of the traditional "granulation" technology. To truly achieve a breakthrough in architectural ceramic powder production technology, we must break free from the mindset of "granulation" and explore a completely new technological path. To this end, our company has developed a novel wet powder production process for architectural ceramics. Summary of the Invention

[0006] The purpose of this invention is to provide a wet powdering process for building ceramics, which solves the problem that existing dry powdering technology has long failed to achieve the production effect of wet powdering due to its adherence to wet powdering process parameters and failure to overcome the defects of "granulation" structure. At the same time, it avoids the inherent drawbacks of high energy consumption and high water consumption in wet powdering, and achieves a fundamental breakthrough in powder performance and production energy consumption.

[0007] To achieve the above objectives, the present invention provides a process for wetting and powdering building ceramics, comprising the following steps:

[0008] Step 1: Preparation of dry powder particles;

[0009] Step 2: Use a wetting tower to uniformly wet the dry powder particles with fine water mist to obtain micro-agglomerated powder;

[0010] Step 3: Perform post-tower coarse sieving on the micro-agglomerated powder;

[0011] Step 4: Use the rinsing chamber to homogenize and rinsing the micro-agglomerated powder that has passed through the coarse sieve after the tower.

[0012] Step 5: Perform post-warming medium sieve on the micro-agglomerated powder that has undergone homogenization and warming.

[0013] Step 6: Perform pre-press fine sieving on the micro-agglomerated powder that has passed through the waking-up medium sieve to obtain molding powder;

[0014] Step 7: The molding powder is shaped, dried and fired.

[0015] Preferably, the dry powder particle preparation process relies on a dual-path raw material pretreatment system, which includes a wet pretreatment-drying and pulverizing path and a direct dry processing path. The wet pretreatment-drying and pulverizing path is suitable for the production of high-moisture raw materials and high-end products, while the direct dry processing path is suitable for the large-scale production of conventional raw materials with a moisture content of less than 12%.

[0016] Preferably, the process of the wet pretreatment-drying and crushing path includes raw material intake → batching → wet ball milling → iron removal and sieving of slurry → pressure filtration and dewatering to form mud cake → drying in kiln tail mesh belt dryer → crushing → qualified dry powder.

[0017] Preferably, the process of the direct dry processing route includes raw material intake → batching → differentiated grinding → high-efficiency powder selection and dust collection → qualified dry powder.

[0018] Preferably, the high-efficiency powder selection and dust collection includes cleaning fibrous materials with a brush and fine screening of excessively large particles with a high-level flat screen; in the differentiated grinding process, different grinding equipment is selected according to the moisture content of the product, using a vertical mill to grind raw materials with a moisture content greater than 4% and less than 12%, and using a dry ball mill to grind raw materials with a moisture content less than 4%.

[0019] Preferably, the wetting tower is equipped with a high-frequency vibrating powder distribution device and a fine water mist spraying device arranged vertically. The high-frequency vibrating powder distribution device forms a uniform powder curtain on the cross-section of the wetting tower. The entire powder distribution process is completely free from weathering and airflow interference, resulting in low energy consumption and a powder distribution uniformity that is more than 50% higher than that of traditional pneumatic powder distribution. The fine water mist spraying device is matched with the circular or cuboid structure of the high-frequency vibrating powder distribution device to achieve precise control over droplet size, spatial distribution, and water-powder contact. Based on the core principle that "droplet size must be smaller than dry powder particle size", the fine water mist spraying device uses high-pressure fine water atomization technology to ensure that the droplets are smaller than the particle size of the dry powder.

[0020] Preferably, the micro-agglomerated powder that has passed through the coarse sieve after the tower is allowed to stand for 60 to 72 hours in the stand-up drying chamber. By utilizing the kinetic principle of water diffusion and the capillary action at the compacted contact points between powder particles, water is allowed to migrate from the locally enriched areas to the scarce areas, and to penetrate and be evenly distributed from the surface of the powder particles to the compacted contact points and micropores.

[0021] Preferably, the green body forming, drying and firing process includes the processes of cloth application, pressing, drying, glazing and firing, which transforms the prepared wetted powder into the final ceramic product, achieving seamless integration with traditional production lines. The cloth application and pressing processes are matched with a cloth application system and a pressing system with high compressibility.

[0022] Preferably, to address the issue of powder adhesion, during the powder feeding process, a Teflon coating or high-density PE board is used throughout the powder contact stage to prevent powder from clumping and ensuring that the powder remains loose before being fed onto the grid, thus guaranteeing uniform filling. During the pressing process, slow pre-pressing and multi-stage venting are employed. The drying process is carried out using a drying kiln, with the initial temperature of the green body slowly increased during the preheating section and the initial drying stage of the kiln. During the firing process, a firing method of "gradual heating to reduce thermal stress and ensure thorough oxidation" is adopted.

[0023] Preferably, anti-clogging drum screens are used in the processes of coarse screening after tower, intermediate screening after waking up, and fine screening before pressing.

[0024] Therefore, the building ceramic wetting and powdering process of the present invention, which adopts the above-described structure, has the following beneficial effects:

[0025] 1. This invention provides a new zero-fuel-consumption wetting powder production process for micro-agglomerate powders by "direct wetting of fine powder without granulation". It completely abandons the "granulation" step that is considered inevitable in traditional processes, and instead adopts the physical path of "direct wetting of fine powder". It eliminates the need for spray drying towers with high energy consumption, high water consumption and high emissions as in wet powder production processes. It achieves a fundamental breakthrough in powder performance and production energy consumption by utilizing a wetting tower.

[0026] 2. In response to the characteristics of wetted powder having a liquid film on its surface and being easy to adhere, an innovative three-stage screening process of "coarse screening after towering - medium screening after resting - fine screening before pressing" is implemented to improve the overall performance of the powder used for molding, thereby ensuring the performance of ceramic products. Among them, the coarse screening after towering (1-2 mesh) removes excessively large agglomerates; the medium screening after resting (5-6 mesh) breaks up soft agglomerates; and the fine screening before pressing (8-10 mesh) ensures the final particle size consistency.

[0027] 3. A dual-path raw material pretreatment system for obtaining dry powder particles in the wetting and milling process was designed. Based on the initial moisture content of the raw materials and the product quality requirements, two parallel and flexibly selectable process paths are provided, which ultimately converge to a unified wetting tower core section for wetting and milling, achieving universal coverage of raw materials across all regions and categories.

[0028] 4. By utilizing the combined process of "brush fiber cleaning + flat screen fine screening", a dry and efficient impurity removal method with multiple means working together in a graded and segmented manner is achieved, fundamentally solving the problem of fiber clogging.

[0029] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0030] Figure 1 This is a flowchart illustrating an embodiment of a building ceramic wetting and powdering process according to the present invention;

[0031] Figure 2 This is a flowchart illustrating an embodiment of a dual-path raw material pretreatment system in a building ceramic wetting and powdering process according to the present invention.

[0032] Figure 3 This is a flowchart illustrating an embodiment of the body forming, drying, and firing steps in a building ceramic wet powder preparation process according to the present invention. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Example

[0036] Reference Figures 1-3 As shown, this embodiment provides a process for wetting and powdering building ceramics, including the following steps:

[0037] Step 1: Dry powder particle preparation. This step provides raw material dry powder particles with stable composition, qualified particle size, and high purity for wet powder preparation. The typical particle size range of dry powder particles is D50 of approximately 15-45 μm, depending on product requirements.

[0038] Step 2: Use a wetting tower to uniformly wet the dry powder particles with fine water mist to obtain micro-agglomerated powder;

[0039] Step 3: Perform coarse sieving on the micro-agglomerated powder after the tower;

[0040] Step 4: Use the rinsing chamber to homogenize and rinsing the micro-agglomerated powder that has passed through the coarse sieve after the tower.

[0041] Step 5: Perform post-warming medium sieving on the homogenized and warmed micro-agglomerated powder;

[0042] Step 6: The micro-agglomerated powder that has passed through the intermediate sieve after waking is subjected to a pre-press fine sieve to obtain the powder for molding;

[0043] Step 7: Shape, dry and fire the powder for molding.

[0044] The above process provides a novel zero-fuel-consumption wetting powder production process for micro-agglomerate powders, which involves "direct wetting of fine powder without granulation." This completely eliminates the "granulation" step considered essential in traditional processes, instead employing a physical path of "direct wetting of fine powder." Unlike wet powder production processes, this eliminates the need for high-energy-consuming, high-water-consuming, and high-emission spray drying towers. The wetting tower achieves a fundamental breakthrough in powder performance and production energy consumption. Addressing the characteristics of the wetted powder surface—a liquid film and easy adhesion—an innovative three-stage segmented sieving process is implemented: "coarse sieving after tower—medium sieving after resting—fine sieving before pressing." This improves the overall performance of the powder used for molding, thereby ensuring the performance of ceramic products. Specifically, the coarse sieving after tower (1-2 mesh) removes excessively large agglomerates; the medium sieving after resting (5-6 mesh) breaks up soft agglomerates; and the fine sieving before pressing (8-10 mesh) ensures consistent final particle size. The two core processes, wetting and restoring, in steps 2 and 4, transform qualified dry powder into high-performance molding powder, which is the unique value creation center of the wetting powder making process.

[0045] Further optimization of the scheme: the dry powder particle preparation process in step 1 relies on a dual-path raw material pretreatment system. The dual-path raw material pretreatment system includes a wet pretreatment-drying and pulverizing path and a direct dry treatment path. The wet pretreatment-drying and pulverizing path is suitable for the production of high-moisture raw materials and high-end products, while the direct dry treatment path is suitable for the large-scale production of conventional raw materials with a moisture content of less than 12%.

[0046] The wet pretreatment-drying and crushing process includes raw material intake → batching → wet ball milling → iron removal and sieving of slurry → filter press dewatering into mud cake → drying in kiln tail mesh belt dryer → crushing → qualified dry powder.

[0047] The direct dry processing route includes the following steps: raw material intake → batching → differentiated grinding → high-efficiency powder selection and dust collection → qualified dry powder. During differentiated grinding, different grinding equipment is selected based on the product's moisture content. A vertical mill is used to grind raw materials with a moisture content greater than 4% and less than 12%, while a dry ball mill is used to grind raw materials with a moisture content less than 4%. The dry fine powder generated during differentiated grinding contains fibrous and particulate impurities. In this embodiment, an innovative "grading, segmentation, and multi-method synergy" impurity removal system is constructed in the powder selection stage of high-efficiency powder selection and dust collection. This system includes using brushes to clean fibrous materials and using high-efficiency flat screens to finely screen and remove excessively large particles.

[0048] In use, the aforementioned dual-path raw material pretreatment system allows producers to process raw materials with different moisture contents using different paths to obtain qualified dry powder, expanding the range of raw materials for wet powder production of building ceramics and facilitating the promotion and use of this invention. Specifically, the wet pretreatment-drying and powder breaking path is applicable to the production of high-moisture-content plastic clay (such as southern soft clay and black mud, with a moisture content of 18%-25%) and high-quality products (large-format slabs, nano-grade glazed tiles, and other products with stringent requirements for purity, whiteness, and sintering activity). The direct dry processing path is applicable to the large-scale production of mainstream conventional ceramic products (interior wall tiles, antique tiles, paving stones, medium-sized slabs, glazed tiles, etc.) with relatively low overall moisture content (<12%).

[0049] Further optimizing the scheme, in step 2, the wetting tower is equipped with a high-frequency vibrating powder distribution device and a fine water mist spraying device arranged vertically. The high-frequency vibrating powder distribution device forms a uniform powder curtain on the cross-section of the wetting tower. The entire powder distribution process is completely free from weathering and airflow interference, resulting in low energy consumption and a powder distribution uniformity improvement of more than 50% compared to traditional pneumatic powder distribution. The fine water mist spraying device matches the circular or cuboid structure of the high-frequency vibrating powder distribution device, enabling precise control over droplet size, spatial distribution, and water-powder contact. Based on the core principle that "droplet size must be smaller than dry powder particle size," the fine water mist spraying device uses high-pressure fine water atomization technology to ensure that the droplets are smaller than the particle size of the dry powder. In this embodiment, the dry powder particle D50 ≈ 50 μm, and the droplet D50 ≤ 30 μm.

[0050] When the wetting tower is a cylindrical tower, the high-frequency vibration powder distribution device combines central dispersion with circumferential uniform distribution. When the wetting tower is a cuboid tower, the high-frequency vibration powder distribution device adopts a grid-like cuboid powder distribution structure. The high-frequency vibration powder distribution device is precisely matched with the subsequent fine water mist spraying device to achieve synergistic optimization of powder distribution and wetting. When the wetting tower is a cylindrical tower, the nozzle layout in the fine water mist spraying device adopts a multi-point distribution formed by long and short spray supports with a "center + circumference" configuration. The spray pattern of the fine water mist spraying device can be switched between umbrella-shaped and fan-shaped. When the wetting tower is a cuboid tower, the nozzle layout in the fine water mist spraying device adopts a "grid-like" layout. The spray pattern of the fine water mist spraying device can be switched between mountain-shaped and mesh-shaped to meet the needs of different working conditions.

[0051] During operation, the material curtain and mist field inside the wetting tower come into full, interwoven contact, achieving uniform mixing of water and powder. In this process, water does not act as a "binder" to "granulate," but rather as a "plasticizing medium," instantly encapsulating or adsorbing onto the surface of each fine powder particle in an extremely thin film. The powder rapidly transforms from a two-phase "solid-gas" system to a three-phase "solid-liquid-gas" coexisting slightly moist state, forming loose, dynamic micro-agglomerates. This process completes the wetting, soaking, and spreading of the powder surface, significantly reducing surface energy. The wetting tower outlet produces an intermediate product—a "wet on the outside, dry on the inside" micro-agglomerated powder with 7%–8% water content—that is, a macroscopically homogenized product with a microscopic (internal and inter-particle) gradient. At this point, the powder exhibits temporary adhesion due to the surface liquid film, making it prone to adhesion and in a thermodynamically non-equilibrium state.

[0052] Further optimizing the process, in step 4, the micro-agglomerated powder after passing through the coarse sieve at the bottom of the tower is allowed to rest for 60–72 hours in the restoring chamber. The moistened powder is then subjected to maturation treatment under static or quasi-static conditions. Utilizing the kinetics of water diffusion and the capillary action at the compacted contact points between powder particles, water spontaneously and uniformly migrates and distributes within and between the powder particles, forming a stable micro-agglomerated structure. This process does not aim to form strong particles, but rather to achieve the ideal state of powder that is "moist" yet "uniform," "loose," and "stable."

[0053] During use, the fine water mist in step 3 evenly wets the powder, and the powder restoring process in step 4 works together to form micro-agglomerates with a unique structure, rather than granular powder in the traditional sense. This micro-agglomerate structure is loose and has interconnected pores, which not only retains the original fineness of the dry powder but also improves the bonding and water retention between powder particles, creating ideal conditions for subsequent pressing and molding.

[0054] Further optimization of the scheme involves the green body forming, drying and firing processes, including cloth application, pressing, drying, glazing and firing, which transforms the prepared wetted powder into the final ceramic product, achieving seamless integration with traditional production lines. The cloth application and pressing processes are matched with a cloth application system and a pressing system with high compressibility.

[0055] Furthermore, during the fabrication process, to address the issue of powder adhesion, a Teflon coating or high-density PE board is applied throughout the powder contact stage to prevent powder agglomeration and ensure that the powder remains loose before being laid on the grid, guaranteeing uniform filling. Based on the characteristics of wet powder production (micro-agglomeration, low density, easy adhesion and compaction) and the relatively small specific surface area of ​​fine powders produced by dry processes, different forming and fabrication requirements arise compared to traditional powders. Wet powders require a high compression ratio (2.5-2.7, 25% higher than traditional methods).

[0056] When pressing, slow pre-pressing and multi-stage venting should be implemented. Due to the thick and loose powder layer, a low speed should be used in the initial mold closing stage, and multiple micro-lift venting stages may be set to facilitate the smooth discharge of air from the large powder bed and prevent "powder spraying" and air trapping inside the blank.

[0057] The drying process utilizes a drying kiln, with a slow initial temperature increase in the preheating section and early drying stage. The micro-agglomerated green body formed by pressing has continuous pores and open channels, resulting in rapid drainage, high drying sensitivity, and a 15-20% reduction in drying shrinkage compared to traditional wet methods. The slow temperature increase drying method aims to reduce the saturated vapor pressure of moisture on the green body surface, thereby slowing down the surface evaporation rate and matching it with the internal moisture migration capacity. Therefore, a "low-temperature, slow-speed" drying strategy was developed, employing a finely controlled drying process mode of "low-temperature long preheating, gradual temperature increase, and reasonable humidity control."

[0058] During firing, in order to prevent thermal shock and promote uniform oxidation, a firing process method of "gradual heating to reduce thermal stress and ensure thorough oxidation" is adopted.

[0059] Further optimization of the scheme resulted in the use of anti-clogging drum screens in the coarse screening after tower, the medium screening after refrigeration, and the fine screening before pressing.

[0060] When in use, the anti-clogging drum screen can achieve efficient screening and control the standard deviation of powder particle size distribution within a suitable range.

[0061] Therefore, the present invention employs a building ceramic wetting powder preparation process with the above-mentioned structure, which can completely eliminate the "granulation" step considered essential in traditional processes, and instead adopt the physical path of "direct wetting of fine powder". It eliminates the need for high-energy-consuming, high-water-consuming and high-emission spray drying towers as in wet powder preparation processes, and achieves a fundamental breakthrough in powder performance and production energy consumption by utilizing a wetting tower. In view of the characteristics of the wetted powder surface having a liquid film and being easy to adhere, an innovative three-stage segmented screening process of "coarse screening after tower - medium screening after resting - fine screening before pressing" is implemented to improve the overall performance of the powder for molding, thereby ensuring the performance of ceramic products.

[0062] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0063] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A process for wetting and powdering building ceramics, characterized in that: Includes the following steps: Step 1: Preparation of dry powder particles; Step 2: Use a wetting tower to uniformly wet the dry powder particles with fine water mist to obtain micro-agglomerated powder; Step 3: Perform post-column coarse sieving on the micro-agglomerate powder to remove excessively large agglomerates; Step 4: Use the rinsing chamber to homogenize and rinsing the micro-agglomerated powder that has passed through the coarse sieve after the tower. Step 5: The micro-agglomerated powder after homogenization and rinsing is subjected to a post-rinsing medium sieve to break up the soft agglomerates; Step 6: The micro-agglomerated powder that has passed through the intermediate sieve after waking is subjected to a pre-press fine sieve to obtain powder for molding. The pre-press fine sieve is used to ensure the final particle size consistency. Step 7: The molding powder is shaped, dried and fired.

2. The building ceramics wetting and powdering process according to claim 1, characterized in that: The dry powder particle preparation process relies on a dual-path raw material pretreatment system, which includes a wet pretreatment-drying and pulverizing path and a direct dry processing path. The wet pretreatment-drying and pulverizing path is suitable for the production of high-moisture raw materials and high-end products, while the direct dry processing path is suitable for the large-scale production of conventional raw materials with a moisture content of less than 12%.

3. The building ceramics wetting and powdering process according to claim 2, characterized in that: The process of the wet pretreatment-drying and crushing path includes raw material intake → batching → wet ball milling → iron removal and sieving of slurry → pressure filtration and dewatering into mud cake → drying in kiln tail mesh belt dryer → crushing → qualified dry powder.

4. The building ceramics wetting and powdering process according to claim 2, characterized in that: The process of the direct dry processing route includes raw material intake → batching → differentiated grinding → high-efficiency powder selection and dust collection → qualified dry powder.

5. The building ceramics wetting and powdering process according to claim 4, characterized in that: The high-efficiency powder selection and dust collection process includes cleaning fibrous materials with a brush and finely screening excessively large particles with a high-level flat screen; the differentiated grinding process selects different grinding equipment according to the moisture content of the product, using a vertical mill to grind raw materials with a moisture content greater than 4% and less than 12%, and using a dry ball mill to grind raw materials with a moisture content less than 4%.

6. The building ceramics wetting and powdering process according to claim 1, characterized in that: The wetting tower is equipped with a high-frequency vibrating powder distribution device and a fine water mist spraying device arranged vertically. The high-frequency vibrating powder distribution device forms a uniform powder curtain on the cross-section of the wetting tower. The entire powder distribution process is completely free from weathering and airflow interference, resulting in low energy consumption and a powder distribution uniformity that is more than 50% higher than that of traditional pneumatic powder distribution. The fine water mist spraying device is matched with the high-frequency vibrating powder distribution device in a circular or cuboid structure, enabling precise control over droplet size, spatial distribution, and water-powder contact. Based on the core principle that "droplet size must be smaller than dry powder particle size", the fine water mist spraying device uses high-pressure fine water atomization technology to ensure that the droplets are smaller than the particle size of the dry powder.

7. The building ceramics wetting and powdering process according to claim 1, characterized in that: The micro-agglomerated powder that has passed through the coarse sieve at the bottom of the tower is allowed to stand for 60 to 72 hours in the stand-up powder chamber. By utilizing the kinetic principle of water diffusion and the capillary action at the compact contact points between powder particles, water is allowed to migrate from the local enrichment area to the depletion area, and to penetrate and be evenly distributed from the surface of the powder particles to the compact contact points and micropores.

8. The building ceramics wetting and powdering process according to claim 1, characterized in that: The green body forming, drying and firing process includes the processes of cloth application, pressing, drying, glazing and firing, which transforms the prepared wetted powder into the final ceramic product and achieves seamless integration with traditional production lines. The cloth application and pressing processes are matched with a cloth application system and a pressing system with high compressibility.

9. The building ceramics wetting and powdering process according to claim 8, characterized in that: To address the issue of powder adhesion, during the powder feeding process, a Teflon coating or high-density PE board is used throughout the powder contact stage to prevent powder from clumping and ensuring that the powder remains loose before being fed onto the grid, guaranteeing uniform filling. During the pressing process, slow pre-pressing and multi-stage venting are employed. The drying process is carried out using a drying kiln, with the initial temperature of the green body slowly increased during the preheating section and the initial drying stage. During the firing process, a firing method of "gradual heating to reduce thermal stress and ensure thorough oxidation" is adopted.

10. The building ceramics wetting and powdering process according to claim 8, characterized in that: Anti-clogging drum screens are used in the coarse screening after tower, the intermediate screening after waking up, and the fine screening before pressing.

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