Building ceramic wetting powder production process

Abstract

The invention relates to the technical field of building ceramic production, in particular to a building ceramic wetting powdering production process which is characterized in that in the upgrading and updating dry-method powdering production process link, granulation is carried out, and fine powder is bonded and gathered into granular powder through water drops; the fine powder is uniformly atomized and wetted by fine water mist, so that the fine powder is not granulated. According to the technology, non-stale powder obtained after powder preparation is directly connected with a press for forming, and an anti-sticking roller screen and an anti-sticking material distributing device are used in a matched mode, so that the production effect the same as that of wet-method powder preparation is achieved, meanwhile, the technology route that after slurry grinding, impurity removal and iron removal are conducted through a ball mill in the wet-method powder preparation process, slurry is subjected to filter pressing to form mud, the mud is dried and then crushed into powder, and then wetting powder preparation is conducted is broken through; therefore, a novel powder production process flow which can overcome the defects of a dry-method powder production process and the energy consumption problem of wet-method powder production and is compatible with each other and capable of covering all regions and all categories is formed.

Description

Technical Field

[0001] The invention relates to the technical field of building ceramic production, in particular to a building ceramic wet powder production process. Background Art

[0002] Building ceramics mainly include ceramic tiles, glazed tiles, exterior wall tiles, floor tiles, ceramic mosaic tiles, etc. At present, the production of building ceramics is still mainly based on the wet process. Figure 1 As shown. In recent years, with the continuous deepening of energy conservation, environmental protection, emission reduction, carbon reduction and the continuous improvement of energy consumption standards, the dry production technology of building ceramics has come into being. After years of research and development, the dry production technology of building ceramics has made progress in many aspects and breakthroughs in key points. However, because the entire process method and process are still being improved and summarized, the promotion effect of the ceramic industry is not good.

[0003] The dry production process of building ceramics is a product of the corresponding wet production process. Due to the different production regions, the building ceramics industry uses different local raw materials, resulting in huge differences in the moisture content of raw materials used in the southern and northern production areas. This will cause contradictions for the process method that requires low moisture content of raw materials for dry production, and it is even completely unsuitable and unusable in the rainy areas in the south. For this reason, the dry powder production process of building ceramics must comprehensively consider all aspects of factors, combine the existing wet powder production process technology, and summarize a new powder production process that covers the entire industry.

[0004] The purpose of the present invention is to provide a wet powder production process for building ceramics to solve the problems raised in the above background technology. Summary of the invention

[0005] To achieve the above object, the present invention provides the following technical solution: a wet powder production process for building ceramics, comprising the following steps: A1, Raw material storage: The selected facility is the unloading pit, which is composed of a steel bar screen, a jaw crusher, a hammer crusher, and an elevator. After the raw materials enter the factory, they are poured into the unloading pit, and the fine materials fall into the funnel belt through the inclined steel bar screen with a gap of less than 3cm. The large particles larger than 3cm enter the jaw crusher for crushing. After the crushed materials are screened out, the particles larger than 3cm are then crushed in the hammer crusher, and then flow into the same transmission belt and transported to the elevator to be transferred to the circulation bin; A2, Raw material preparation and drying: The selected facility is a transfer bin, which is made of steel plates. Its main function is to ensure that the mesh belt dryer at the end of the kiln has continuous material drying. The volume of the transfer bin is designed to be 1.5 times the output of the mesh belt dryer at the end of the kiln. The inner lining is equipped with a high-density PE anti-sticking plate, and the discharge end is designed to be conical. The incoming raw materials are planned to enter the factory according to the formula ratio; A3, Raw material drying: The selected equipment is the mesh belt dryer at the end of the kiln. The mesh belt dryer at the end of the kiln is an integrated composite design of the rear end of the kiln quenching and the mesh belt dryer. It is installed above the rear end of the kiln after the quenching. The working temperature of the mesh belt dryer at the end of the kiln is 50-500℃, and the number of designed layers is 2-7. The heat source is the cooling waste heat generated during the rapid cooling, slow cooling, rapid descent and slow descent of the kiln after the bricks are fired at a high temperature of 1150-1200℃. The mesh belt dryer at the end of the kiln is designed to operate at a frequency modulation mode. Different speeds are adjusted according to the moisture content of different raw materials to ensure that the moisture content of the raw materials after drying is within 2%; A4, Raw material reserve: The selected facility is the storage silo group. The number of storage silos is designed according to the required quantity of raw materials in the formula, and two spare silos are designed. This silo group replaces the material yard stacking in the traditional wet process, avoiding the traditional forklift loading, achieving clean production, and greatly reducing the area occupied by the raw material yard and the investment in the factory building. In order to ensure stable production, the storage volume of the storage group is designed according to the raw material consumption of about one month's production; A5, online batching of raw materials: select a belt scale, input the belt scale operating parameters according to the formula ratio, ensure accurate unloading, mix them on the same belt, and install an iron magnet on the belt. It is not recommended to use the same belt for unloading and weighing. A6, Formula material grinding: The selected equipment is a vertical mill. Due to the variety of ceramic formula raw materials, the difference between soft and hard is large. When the grinding roller is pressurized, it is easy to spray powder or large particles of raw materials will vibrate. When selecting, the tire roller vertical mill is preferred. The abrasive material should be a steel slag mill. The particle size of the raw material entering the mill should not exceed 3cm, and the moisture content should not exceed 2%. Considering the regular repair welding of the vertical mill roller, the output of the vertical mill should be twice the production demand. A7, powder collection: use the equipment's built-in air flow trough powder collector; A8, powder storage and homogenization: spiral steel silo is used as the facility, and the storage capacity is designed based on 3 to 5 times the daily powder consumption. 5 to 7 fan-shaped air flow troughs are made at the bottom of the silo to discharge powder, and the powder discharge method is jump-type interval discharge to achieve the goal of re-homogenization of fine powder; A9, primary impurity removal of fine powder: the selected equipment is single or double flat screen, and the single or double flat screen needs to be equipped with a fiber impurity removal device; A10, secondary impurity removal of fine powder: the selected equipment is a high-level screen, which is selected and configured according to the fineness requirements of the powder of ceramic products; B1, raw materials storage; B2, raw material ingredients; B3, formula material refining: the existing refining equipment is ball mill and continuous ball mill. In order to improve the refining efficiency and save electricity, stirring mill refining is preferred; B4, pulp storage; B5, mud impurity and iron removal; B6, homogenized service; B7, Mud filter: Use plate and frame filter, belt filter, vacuum filter, and require the moisture content of the filtered mud cake to be within 20%; B8, mud drying: The drying equipment is a kiln tail mesh belt dryer, which is the same as described in A3. The number of mesh belt layers can be reduced when drying ceramic raw materials, but the number of mesh belt layers should be increased when drying ceramic filter press mud; B9, drying and pulverizing the clay: use a powder crusher. This process is to crush and pulverize the dried ceramic clay. By installing a powder selection mechanism similar to a vertical mill, the fineness requirement of the fine powder can be guaranteed. B10, fine powder storage: Same as A8. The design of the powder storage bin is completely in accordance with A8. In this process, the slurry has been well homogenized, so the air flow slot at the bottom of the powder storage bin is used to discharge the powder at intervals. C1, Wetting Powdering: The equipment used is the wetting tower. This process is the key to the success of the wet powdering production process of building ceramics. The previous dry granulator sprayed water in the middle and used water mist to atomize the powder particles, which easily caused the powder to be too wet and produce too many granular mud balls. When the granular mud balls were dried in the dryer, they could not be drained cleanly at the same time due to the large amount of water, causing fingertip cracks during the firing process. Before the powder was put into the silo, a 4-6 mesh rolling screen was installed to pre-screen the powder; C2, powder reserve: The material silo made of anti-sticking high-density PE board is selected. In this wet powder production process, the wetting tower is directly connected to the press. The stable silo in this process is set to ensure the necessary powder reserve for stable production of the press. Its storage capacity can meet the powder required for the forming of about 30 tons of press. C3, powder screening: the equipment used is anti-sticking roller screen or anti-sticking vibrating screen. Before the powder enters the distributor, the powder needs to be screened for fineness. The screen fineness is preferably about 10 mesh; C4, cloth: The selected equipment is the grid and cloth hopper sprayed with Teflon anti-stick coating, and the micro-powder belt cloth car is preferred. Because the powder in the wet milling production process is easy to pulverize, there is a lot of fine powder and the fluidity is very poor, the cloth hopper and the cloth grid need to be treated with anti-stick. The belt cloth car uses an anti-stick belt; C5, Forming: The equipment selected is a press, preferably a moldless press. This process is the key to the success of the wet pulverizing production process. After forming, the traditional wet method can be used. Because the powder fluidity of the dry production process is inherently poor, uneven distribution is the norm, so the press forming mold is preferably an isostatic pressing mold.

[0006] Preferably, the A1 only processes raw materials with a water content of less than 11%, and raw materials with a water content exceeding 11%, especially mud materials, need to be transported by a double-screw blade conveyor.

[0007] Preferably, the A4 silo raw material discharge port has a cone design with a high-density PE plate inside to prevent sticking.

[0008] Preferably, the feed port belt and the weighing belt are configured separately in the A5. This is because the weighing belt cannot be thick, otherwise it will affect the accurate weighing. The feed port belt is affected by the weight of the raw materials in the bin and needs to be thickened to prevent the belt from being cut, thereby ensuring the weighing accuracy. At the same time, when the vertical mill is stopped, the raw materials on the belt must not be cleaned, so that when the production is restarted, the stability of the formula powder can be maintained.

[0009] Preferably, the A9 screen is preferably a 30-40 mesh screen, and the screen wire is preferably sprayed with Teflon anti-sticking treatment.

[0010] Preferably, the mesh size of the A10 is preferably in the range of 60 to 100 meshes, and the mesh wire is preferably sprayed with Teflon for anti-sticking treatment.

[0011] Preferably, the fineness of the fine powder in B9 is achieved by a ball mill. For this purpose, the fineness process requirements must be controlled in the mud segment. Preferably, a powder breaker is used to pulverize the dry mud material. It does not require the pressurization design required by the vertical mill grinding function, but only its powder selection function is selected.

[0012] Preferably, in the C1, water is sprayed by a fine water mist atomizing nozzle, and water is sprayed uniformly by a multi-layer cross-sectional horizontal plane. The surface moisture of the fine powder particles promotes the particles to combine with each other while penetrating inward, so that the drying and combing treatment after the dry granulation currently performed is unnecessary. For this reason, a moistening tower milling is preferred to replace the dry granulator equipped with a drying furnace and a combing bed. Since the moistening milling production process is a powder formed by the bonding of fine particles with surface moisture at room temperature, it is very easy to pulverize and peel off. After too many transportation and storage links, it is very easy to form powder clumps, which will cause pits on the surface of the product. For this reason, a moistening tower milling directly connected to a press is preferred. In order to ensure stable production of the press, a stable production warehouse for short-term powder is required.

[0013] Preferably, the C4 preferably has a straight-through rectangular structure for powder inlet and outlet, and the distribution hopper and the grille are preferably treated with Teflon for anti-sticking.

[0014] Preferably, the micro powder belt cloth method is preferred in the C5.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The wet powder production process of building ceramics, AC wet powder production process of building ceramics is an iteration of the dry powder production process technology of building ceramics. The invention and improvement points of each process effectively solve the pain points that affect the dry production process. The A1 process point of raw material storage is to use the unloading pit to comprehensively screen, process and crush the incoming raw materials. The A2 process point of raw material preparation and drying is to use the circulation warehouse to ensure the continuous drying of raw materials, and at the same time solve the dust problem of material yard storage in the existing process flow, as well as the labor, forklift and raw material loss problems occupied by repeated loading and unloading. The A3 process point of raw material drying is to dry the incoming raw materials separately through the mesh belt dryer at the end of the kiln, making full use of the waste heat of the kiln cooling, solving the need for additional heating and drying of the relatively wet raw materials by the vertical mill, reducing waste and increasing the output of the vertical mill. The A4 process point of raw material reserve is to store and dry qualified raw materials by forming a storage bin group, thereby achieving the storage method of the traditional material yard bin, which can not only store a large amount of raw materials, but also avoid the use area and factory building construction required for the storage of materials in the yard, and fundamentally solve the dust environmental protection problem caused by forklift batching. The A5 process point of online raw material batching is to install an electronic belt scale at the lower end of the storage bin group, and start batching at any time and anywhere through central control, which solves the problem of accurate batching of formula materials, solves the instability of existing manual batching by forklift, and avoids repeated labor and dust environmental protection problems. The A6 process point of formula material grinding is to grind the raw materials into fine powder by vertical mill and then perform strong wind homogenization and air separation on the raw material formula, thereby achieving the fine grinding effect of traditional ball mill. The A7 process point of powder collection is to collect the fine powder after the vertical mill powder selector through the dust collector into a fine powder product, realizing the process requirements of raw material grinding into fine powder. The A8 process point of powder storage and homogenization is to store fine powder in the storage bin to meet the peak electricity consumption of the vertical mill and the maintenance and overhaul time of the vertical mill. At the same time, the powder is dispatched through multiple air flow slots at the bottom of the bin to further homogenize the fine powder, so as to better ensure the stability of the formula. The A9 process point of the first-level impurity removal of fine powder is completed by single and double flat screens. As the first-level impurity removal of fine powder, it is mainly used to screen out fiber impurities to prevent the fiber from penetrating at different positions and forming a weaving phenomenon. The A10 process point of the second-level impurity removal of fine powder is completed by a high flat screen. As the second-level impurity removal of fine powder, its main function is to screen out large particles until the fineness required by the production process is reached.

[0016] 2. The BC scheme of the wet pulverizing production process of building ceramics is consistent with the existing wet process 1 to 6 in terms of raw material storage B1, raw material batching B2, formula material grinding B3, slurry storage B4, mud impurity and iron removal B5, and homogenization service B6. Instead, it is connected back to the wet pulverizing C1 process point in the dry pulverizing process flow at the process nodes of mud filtration B7, mud drying B8, dried mud pulverization B9, and fine powder storage B10. The inventive point of the wet pulverizing production process of building ceramics is to combine the different regions and the different moisture content of raw materials, and creatively summarize and invent different wet pulverizing production process paths. In order to achieve the goal of energy saving and emission reduction in building ceramic production.

[0017] 3. The wet powder production process of building ceramics, granulation powder C1 process point is completed by the wetting tower. The wet powder production should be aimed at uniform wetting of fine powder water, and resolutely prevent the problem of over-wet particles forming mud particles. For this reason, the wet powder production does not need to be equipped with combing bed and hot air furnace facilities, and the raw material powder production is truly energy-free. The powder reserve C2 process point is completed by a storage bin made of about 30 tons of high-density PE board. To ensure the continuous production of the press and the maintenance time of the wet granulator. The powder screening C3 process point is completed by an anti-sticking roller screen or an anti-sticking vibration screen. The powder entering the press distributor must be screened for large particles to prevent large particles from causing fingertip cracks after pressing and firing of bricks. At the same time, a secondary flat screen should be installed when the powder enters the press distributor hopper to solve the product powder group defect. The roller screen and the distributor hopper can also be directly connected to directly distribute the material or use a micro-powder belt distributor car to distribute the material. After that, the process points are forming C5, wet blank drying C6, glazing inkjet C7, firing C8, blank storage and polishing C9, and grading and packaging for storage C10. These process flows are no different from wet process steps 11 to 16. The above AC wet powder production process of building ceramics has been verified by production practice and has achieved significant energy-saving, emission-reduction and carbon-reduction effects. This process flow is suitable for new production lines in various regions in the north and south, as well as the technical transformation of the wet production process of existing material yards and silos in the north. When the northern factory is technically transformed, the A1 to A4 process steps are not used for the time being, but the material yard and silo are used to store materials, select low-moisture raw materials, and add a batching hopper group and connect A5 to realize the dry production process. This dry production process ignores the influence of iron removal by strengthening screening, and produces mass products with low requirements for body whiteness. For products with whiteness requirements for body whiteness and ceramic factories in humid areas in the south, it is recommended to use the BC plan for the wet powder production process of building ceramics. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0019] Figure 1 The present invention is a flow chart of the wet production process of architectural ceramics; Figure 2 The present invention is a process flow chart of the wet powder production process of building ceramics. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] See also Figure 1-Figure 2 , the present invention provides a technical solution: The wet powder production technology of building ceramics separates coarse and fine raw materials, and processes the coarse materials into qualified raw materials at the same time, and transports them to the circulation warehouse for storage. The purpose of setting up the circulation warehouse is to solve the problem of continuous operation of the mesh belt dryer at the end of the kiln, and at the same time ensure that the same raw materials are dried within the corresponding time period. Mud raw materials must also be treated separately to meet the requirements of material drying. The mesh belt dryer at the end of the kiln uses a large amount of waste heat after the kiln is cooled, and all the heat dissipation in each section after the kiln is quenched to supply heat to the mesh belt dryer at the end of the kiln. At the same time, in order to reduce the loss of waste heat transmission over long distances, the effect of the dryer and the space utilization, the kiln mesh belt dryer is designed at the upper end of the kiln, and the system connection between the kiln cooling and the mesh belt dryer heating is redesigned. The raw materials dried by the mesh belt dryer at the end of the kiln are uniformly transported and stored in large steel or cement storage silos, one raw material in one silo, and cannot be mixed. The bottom of the raw material storage silo is directly connected to the electronic belt scale to ensure the accurate weighing of each raw material according to the requirements of the ceramic formula. When production starts, they are aggregated on the same belt to feed the vertical mill. The qualified fine powder ground by the vertical mill is collected by the dust collector of the vertical mill and put into the powder storage bin for homogenization and standby. It is transported from the powder storage bin to the impurity removal system for the first-level removal of fiber impurities and the second-level removal of large and granular impurities, so as to meet the process fineness requirements. After screening, the qualified fine powder is transported to the wetting tower for powder making. The powder for powder making is screened by the roller screen to remove the coarse particles and then stored in the stabilization bin to ensure the continuous operation of the press. The powder coming out of the stabilization bin is screened by the anti-sticking drum screen, and then processed by the press distribution system and distributed to the press mold, and then the press is formed for continuous production. The formed wet blank needs to be drained and dried in the dryer to meet the process requirements of moisture content entering the kiln. After the wet blank is dried into a dry blank, it is treated by the glossing line and the inkjet machine. After the bottom glossing is completed, it enters the kiln. After the kiln is fired and cooled according to the process firing curve, it is graded and packaged after being stored or directly polished according to different products, thus completing the AC process for the wet powder production process of all building ceramics adapted to the whole north and south regions. Considering the rainy areas in the south, the technical transformation needs of manufacturers of existing wet production processes, and the need for ceramic products with high requirements for brick whiteness, the existing wet production process is connected to the dry process technology for innovative improvement, so as to achieve the same energy-saving and emission reduction effect of the dry production process. In this way, the BC method of building ceramic wet powder production process is proposed. The B1 to B6 processes of the process are synchronized with the wet production process, and the dry production process begins at the B7 process. The B7 process is to filter the impurity- and iron-removing mud into mud blocks through a filter press, crush it through a mud block disperser, and then transport it to the mesh belt dryer at the end of the kiln for drying. After reaching the drying process standard, it is transported to a powder crusher for collecting fine powder and stored in a powder storage bin. The fine powder is then transported to the C1 wetting tower for wetting and milling, thus forming a wet milling production process flow of the BC plan that is suitable for the humid southern regions and can utilize the existing wet method production facilities.

[0023] A wet powder production process for building ceramics comprises the following steps: A1, Raw material storage: The selected facility is the unloading pit, which is composed of a steel bar screen, a jaw crusher, a hammer crusher, and an elevator. After the raw materials enter the factory, they are poured into the unloading pit, and the fine materials fall into the funnel belt through the inclined steel bar screen with a gap of less than 3cm. The large particles larger than 3cm enter the jaw crusher for crushing. After the crushed materials are screened out, the particles larger than 3cm are then crushed in the hammer crusher, and then flow into the same transmission belt and transported to the elevator to be transferred to the circulation bin; A2, Raw material preparation and drying: The selected facility is a transfer bin, which is made of steel plates. Its main function is to ensure that the mesh belt dryer at the end of the kiln has continuous material drying. The volume of the transfer bin is designed to be 1.5 times the output of the mesh belt dryer at the end of the kiln. The inner lining is equipped with a high-density PE anti-sticking plate, and the discharge end is designed to be conical. The incoming raw materials are planned to enter the factory according to the formula ratio; A3, Raw material drying: The selected equipment is the mesh belt dryer at the end of the kiln. The mesh belt dryer at the end of the kiln is an integrated composite design of the rear end of the kiln quenching and the mesh belt dryer. It is installed above the rear end of the kiln after the quenching. The working temperature of the mesh belt dryer at the end of the kiln is 50-500℃, and the number of designed layers is 2-7. The heat source is the cooling waste heat generated during the rapid cooling, slow cooling, rapid descent and slow descent of the kiln after the bricks are fired at a high temperature of 1150-1200℃. The mesh belt dryer at the end of the kiln is designed to operate at a frequency modulation mode. Different speeds are adjusted according to the moisture content of different raw materials to ensure that the moisture content of the raw materials after drying is within 2%; A4, Raw material reserve: The selected facility is the storage silo group. The number of storage silos is designed according to the required quantity of raw materials in the formula, and two spare silos are designed. This silo group replaces the material yard stacking in the traditional wet process, avoiding the traditional forklift loading, achieving clean production, and greatly reducing the area occupied by the raw material yard and the investment in the factory building. In order to ensure stable production, the storage volume of the storage group is designed according to the raw material consumption of about one month's production; A5, online batching of raw materials: select a belt scale, input the belt scale operating parameters according to the formula ratio, ensure accurate unloading, mix them on the same belt, and install an iron magnet on the belt. It is not recommended to use the same belt for unloading and weighing. A6, Formula material grinding: The selected equipment is a vertical mill. Due to the variety of ceramic formula raw materials, the difference between soft and hard is large. When the grinding roller is pressurized, it is easy to spray powder or large particles of raw materials will vibrate. When selecting, the tire roller vertical mill is preferred. The abrasive material should be a steel slag mill. The particle size of the raw material entering the mill should not exceed 3cm, and the moisture content should not exceed 2%. Considering the regular repair welding of the vertical mill roller, the output of the vertical mill should be twice the production demand. A7, powder collection: use the equipment's built-in air flow trough powder collector; A8, powder storage and homogenization: spiral steel silo is used as the facility, and the storage capacity is designed based on 3 to 5 times the daily powder consumption. 5 to 7 fan-shaped air flow troughs are made at the bottom of the silo to discharge powder, and the powder discharge method is jump-type interval discharge to achieve the goal of re-homogenization of fine powder; A9, primary impurity removal of fine powder: the selected equipment is single or double flat screen, and the single or double flat screen needs to be equipped with a fiber impurity removal device; A10, secondary impurity removal of fine powder: the selected equipment is a high-level screen, which is selected and configured according to the fineness requirements of the powder of ceramic products; B1, raw materials storage; B2, raw material ingredients; B3, formula material refining: the existing refining equipment is ball mill and continuous ball mill. In order to improve the refining efficiency and save electricity, stirring mill refining is preferred; B4, pulp storage; B5, mud impurity and iron removal; B6, homogenized service; B7, Mud filter: Use plate and frame filter, belt filter, vacuum filter, and require the moisture content of the filtered mud cake to be within 20%; B8, mud drying: The drying equipment is a kiln tail mesh belt dryer, which is the same as described in A3. The number of mesh belt layers can be reduced when drying ceramic raw materials, but the number of mesh belt layers should be increased when drying ceramic filter press mud; B9, drying and pulverizing the clay: use a powder crusher. This process is to crush and pulverize the dried ceramic clay. By installing a powder selection mechanism similar to a vertical mill, the fineness requirement of the fine powder can be guaranteed. B10, fine powder storage: Same as A8. The design of the powder storage bin is completely in accordance with A8. In this process, the slurry has been well homogenized, so the air flow slot at the bottom of the powder storage bin is used to discharge the powder at intervals. C1, Wetting and pulverizing: The selected equipment is a wetting tower, which uses an umbrella-shaped powder spraying device and a fine water mist atomization device. This process is the key to the success of the wet pulverizing production technology of building ceramics. The previous dry granulator sprayed water in the middle and used water mist to atomize the powder particles, which easily caused the powder to be too wet and produce too many granular mud lumps. When the granular mud lumps were dried in the dryer, they could not be drained cleanly at the same time due to the large amount of water, causing fingertip cracks during the firing process. Before the powder enters the silo, a 4-6 mesh rolling screen is installed to pre-screen the powder; C2, powder reserve: The material silo made of anti-sticking high-density PE board is selected. In this wet powder production process, the wetting tower is directly connected to the press. The stable silo in this process is set to ensure the necessary powder reserve for stable production of the press. Its storage capacity can meet the powder required for the forming of about 30 tons of press. C3, powder screening: the selected equipment is anti-sticking roller screen or anti-sticking vibrating screen. Before the powder enters the distributor, it is necessary to screen the powder fineness, and the screen fineness is preferably about 10 mesh; C4, cloth: The selected equipment is the grid and cloth hopper cloth sprayed with Teflon anti-stick coating, and the excellent micro powder belt cloth car cloth. Because the wet powder production process is easy to pulverize, there is a lot of fine powder and the fluidity is very poor, the cloth hopper and the cloth grid need to be treated with anti-sticking; C5, Forming: The equipment selected is a press, preferably a moldless press. This process is the key to the success of the wet pulverizing production process. After forming, the traditional wet method can be used. Because the powder fluidity of the dry production process is inherently poor, uneven distribution is the norm, so the press forming mold is preferably an isostatic pressing mold.

[0024] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wet powder production process for building ceramics, characterized in that: The following steps are involved: A1, Raw material storage: The selected facility is the unloading pit, which is composed of a steel bar screen, a jaw crusher, a hammer crusher, and an elevator. After the raw materials enter the factory, they are poured into the unloading pit, and the fine materials fall into the funnel belt through the inclined steel bar screen with a gap of less than 3cm. The large particles larger than 3cm enter the jaw crusher for crushing. After the crushed materials are screened out, the particles larger than 3cm are then crushed in the hammer crusher, and then flow into the same transmission belt and transported to the elevator to be transferred to the circulation bin; A2, Raw material preparation and drying: The selected facility is a transfer bin, which is made of steel plates. Its main function is to ensure that the mesh belt dryer at the end of the kiln has continuous material drying. The volume of the transfer bin is designed to be 1.5 times the output of the mesh belt dryer at the end of the kiln. The inner lining is equipped with a high-density PE anti-sticking plate, and the discharge end is designed to be conical. The incoming raw materials are planned to enter the factory according to the formula ratio; A3, Raw material drying: The selected equipment is the mesh belt dryer at the end of the kiln. The mesh belt dryer at the end of the kiln is an integrated composite design of the rear end of the kiln quenching and the mesh belt dryer. It is installed above the rear end of the kiln after the quenching. The working temperature of the mesh belt dryer at the end of the kiln is 50-500℃, and the number of designed layers is 2-7. The heat source is the cooling waste heat generated during the rapid cooling, slow cooling, rapid descent and slow descent of the kiln after the bricks are fired at a high temperature of 1150-1200℃. The mesh belt dryer at the end of the kiln is designed to operate at a frequency modulation mode. Different speeds are adjusted according to the moisture content of different raw materials to ensure that the moisture content of the raw materials after drying is within 2%; A4, Raw material reserve: The selected facility is the storage silo group. The number of storage silos is designed according to the required quantity of raw materials in the formula, and two spare silos are designed. This silo group replaces the material yard stacking in the traditional wet process, avoiding the traditional forklift loading, achieving clean production, and greatly reducing the area occupied by the raw material yard and the investment in the factory building. In order to ensure stable production, the storage volume of the storage group is designed according to the raw material consumption of about one month's production; A5, online batching of raw materials: select a belt scale, input the belt scale operating parameters according to the formula ratio, ensure accurate unloading, mix them on the same belt, and install an iron magnet on the belt. It is not recommended to use the same belt for unloading and weighing. A6, Formula material grinding: The selected equipment is a vertical mill. Due to the variety of ceramic formula raw materials, the difference between soft and hard is large. When the grinding roller is pressurized, it is easy to spray powder or large particles of raw materials will vibrate. When selecting, the tire roller vertical mill is preferred. The abrasive material should be a steel slag mill. The particle size of the raw material entering the mill should not exceed 3cm, and the moisture content should not exceed 2%. Considering the regular repair welding of the vertical mill roller, the output of the vertical mill should be twice the production demand. A7, powder collection: use the equipment's built-in air flow trough powder collector; A8, powder storage and homogenization: spiral steel silo is used as the facility, and the storage capacity is designed based on 3 to 5 times the daily powder consumption. 5 to 7 fan-shaped air flow troughs are made at the bottom of the silo to discharge powder, and the powder discharge method is jump-type interval discharge to achieve the goal of re-homogenization of fine powder; A9, primary impurity removal of fine powder: the selected equipment is single or double flat screen, and the single or double flat screen needs to be equipped with a fiber impurity removal device; A10, secondary impurity removal of fine powder: the selected equipment is a high-level screen, which is selected and configured according to the fineness requirements of the powder of ceramic products; B1, raw materials storage; B2, raw material ingredients; B3, formula material refining: the existing refining equipment is ball mill and continuous ball mill. In order to improve the refining efficiency and save electricity, stirring mill refining is preferred; B4, pulp storage; B5, mud impurity and iron removal; B6, homogenized service; B7, Mud filter: Use plate and frame filter, belt filter, vacuum filter, and require the moisture content of the filtered mud cake to be within 20%; B8, mud drying: The drying equipment is a kiln tail mesh belt dryer, which is the same as described in A3. The number of mesh belt layers can be reduced when drying ceramic raw materials, but the number of mesh belt layers should be increased when drying ceramic filter press mud; B9, drying and pulverizing the clay: use a powder crusher. This process is to crush and pulverize the dried ceramic clay. By installing a powder selection mechanism similar to a vertical mill, the fineness requirement of the fine powder can be guaranteed. B10, fine powder storage: Same as A8. The design of the powder storage bin is completely in accordance with A8. In this process, the slurry has been well homogenized, so the air flow slot at the bottom of the powder storage bin is used to discharge the powder at intervals. C1, Wetting Powdering: The equipment used is the wetting tower. This process is the key to the success of the wet powdering production process of building ceramics. The previous dry granulator sprayed water in the middle and used water mist to atomize the powder particles, which easily caused the powder to be too wet and produce too many granular mud balls. When the granular mud balls were dried in the dryer, they could not be drained cleanly at the same time due to the large amount of water, causing fingertip cracks during the firing process. Before the powder was put into the silo, a 4-6 mesh rolling screen was installed to pre-screen the powder; C2, powder reserve: The material silo made of anti-sticking high-density PE board is selected. In this wet powder production process, the wetting tower is directly connected to the press. The stable silo in this process is set to ensure the necessary powder reserve for stable production of the press. Its storage capacity can meet the powder required for the forming of about 30 tons of press. C3, powder screening: the equipment used is anti-sticking roller screen or anti-sticking vibrating screen. The powder enters the anti-sticking distributor and needs to be screened for fineness. The screen fineness is preferably about 10 mesh; C4, cloth: The equipment used is to use a grille and a cloth hopper sprayed with Teflon anti-stick coating, or directly use a micro-powder belt cloth car to cloth. Because the wet powder production process is easy to pulverize, there is a lot of fine powder and the fluidity is very poor, the cloth hopper and the cloth grille need to be treated with anti-sticking; C5, Forming: The equipment selected is a press, preferably a moldless press. This process is the key to the success of the wet pulverizing production process. After forming, the traditional wet method can be used. Because the powder fluidity of the dry production process is inherently poor, uneven distribution is the norm, so the press forming mold is preferably an isostatic pressing mold.

2. A wet powder production process for building ceramics according to claim 1, characterized in that: The A1 only processes raw materials with a water content of less than 11%. Raw materials with a water content of more than 11%, especially mud, need to be transported by a double-screw blade conveyor.

3. A building ceramic wet powder production process according to claim 1, characterized in that: The A4 medium silo has a cone-shaped raw material discharge port with a high-density PE plate inside to prevent sticking.

4. A wet powder production process for building ceramics according to claim 1, characterized in that: In the A5, the feed port belt and the weighing belt are preferably configured separately. This is because the weighing belt cannot be thick, otherwise it will affect the accurate weighing. The feed port belt is affected by the weight of the raw materials in the bin and needs to be thickened to prevent the belt from being cut, thereby ensuring the weighing accuracy. At the same time, when the vertical mill is stopped, the raw materials on the belt must not be cleaned, so that when the production is restarted, the stability of the formula powder can be maintained.

5. The wet powder production process for architectural ceramics according to claim 1, characterized in that: The A9 sieve is preferably a 30-40 mesh sieve, and the sieve wire is preferably sprayed with Teflon for anti-sticking treatment.

6. A wet powder production process for building ceramics according to claim 1, characterized in that: The preferred range of the sieve in A10 is 60-100 meshes, and the mesh wire of the sieve is preferably sprayed with Teflon for anti-sticking treatment.

7. A wet powder production process for architectural ceramics according to claim 1, characterized in that: Among the B3, a stirred mill is preferred.

8. A wet powder production process for building ceramics according to claim 1, characterized in that: The fineness of the fine powder in B9 is achieved by a ball mill. For this purpose, the fineness process requirements must be controlled in the mud stage. A powder breaker is preferably used for powder breaking. The powder breaker does not require the pressurization design required by the vertical mill grinding function, but only its powder selection function is selected.

9. A wet powder production process for architectural ceramics according to claim 1, characterized in that: In the C1, water is preferably sprayed by a fine water mist atomizing nozzle, and multi-layer cross-sectional horizontal plane uniform atomization spray is preferred. The moisture on the surface of the fine powder particles promotes the particles to combine with each other while penetrating inward, thereby making it unnecessary to dry and comb the traditional granulation. For this reason, a moistening tower powder making is preferred to replace the dry granulator equipped with a drying furnace and a combing bed. Since this dry process is a process in which particles are bonded to each other by surface moisture at room temperature, they are very easy to pulverize and peel off. Too many transportation and storage links are very easy to form powder clumps, which will cause pits on the product surface. For this reason, a moistening tower powder making direct-connected press is preferred to press brick blanks.

10. A wet powder production process for building ceramics according to claim 1, characterized in that: In the C4, a straight rectangular structure is preferably used for powder inlet and outlet, and the distribution hopper and the grille are preferably treated with Teflon for anti-sticking.

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