A stirred ball mill integrated with a grinding mill and a grinding system

Abstract

The application discloses a kind of stirring ball mill integration mill, it is related to grinding equipment technology.The mill includes cylinder, driving device, grading grate, activation ring, stirring mechanism and separation mechanism.Cylinder is equipped with cavity, and two ends have feed inlet and discharge outlet respectively.Driving device is connected and drives cylinder to rotate around central axis.Grading grate separates cavity into first-stage grinding bin and second-stage grinding bin.Activation ring is installed on the inner wall of cylinder, and is axially spaced apart in first-stage grinding bin, for filtering material particles step by step.Stirring mechanism includes axis parallel stirring shaft, stirring component and stirring driving device for driving stirring shaft rotation, and is arranged in second-stage grinding bin.Separation mechanism is located at the end of second-stage grinding bin, and is provided with isolation blade, for separating second-stage grinding bin and discharge outlet.The mill has the ability to adjust material quantity and finished product quantity in real time, shortens adjustment time, efficiently controls finished product rate, significantly improves production efficiency, and reduces production cost.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of grinding equipment, and particularly relates to a stirring ball mill integrated mill and a powder grinding system. BACKGROUND

[0002] As an important fine grinding equipment, the stirring mill is widely used in many fields such as mining, pigments, chemical industry, building materials, and pharmaceuticals. Its basic components include a driving device, a cylinder, a stirring shaft, a stirrer, and grinding media. Generally, the cylinder is in a cylindrical shape, and the stirrer has three forms of spiral, bar pin, and disc. Steel balls, corundum balls, zirconium balls, or spherical media such as natural river sand and pebbles are commonly used as grinding media.

[0003] In the working process of the stirring mill, the cylinder remains stationary, the driving device is started, and the stirring shaft is driven to rotate, so that the stirrer transmits power to the grinding media. This causes the grinding media and the material to perform multi-dimensional circulation and rotation, effectively achieving the grinding of the material through the action of extrusion force, shear force, and a small amount of impact force. Among them, friction crushing is the main particle crushing method, and extrusion force and impact force play a dominant role in the initial crushing of particles, and shear force determines the fine grinding efficiency. Therefore, improving the shear force between the grinding media is considered an effective way to improve the fine grinding efficiency.

[0004] Although the stirring mill has a wide range of applications in many industries, there are still some significant defects and deficiencies that restrict its further promotion and optimization:

[0005] Firstly, in the working process of the equipment, the high-speed gradient area is relatively small, which leads to the fact that the grinding zone is mainly concentrated near the stirring disc and near the inner wall of the cylinder. This phenomenon significantly affects the grinding effect, resulting in low overall grinding efficiency. Specifically, due to the limited high-speed gradient area, the stirring mill cannot effectively mix and grind the material and the media during operation. The grinding zone is mainly limited to a narrow range near the stirring disc and the inner wall of the cylinder, resulting in low movement of the material in other areas and limiting the grinding effect. This localized grinding area may result in uneven grinding of the material throughout the stirring mill, affecting the quality of the final product and the grinding efficiency.

[0006] Secondly, due to the particle size of clinker is usually around 10-30mm, direct use of the stirred mill for cement grinding needs to be pre-treated. The current market of the stirred mill has quite strict requirements on the particle size of the material, which requires the particle size of the feeding to be around 1mm, which brings a series of challenges and difficulties to the cement production process. Due to the large initial particle size of the clinker, it needs to be crushed and refined to meet the feeding requirements of the stirred mill. This pre-treatment process not only increases the complexity of the production line, but also introduces additional equipment and processes, resulting in an increase in production cost. For the cement industry, it means higher labor costs and equipment investment. The strict requirements of the stirred mill on the particle size of the material also make the operation threshold relatively high. To ensure the normal operation of the stirred mill, the production personnel need to accurately control the crushing and refining process to ensure that the particle size of the clinker fed into the stirred mill is within the appropriate range. This not only increases the skill requirements of personnel, but also may cause operational errors, affecting production efficiency and product quality.

[0007] Thirdly, the existing stirred mill has the problem of poor separation effect when the ground material is separated from the grinding medium. Poor separation effect means that after grinding, the separation of the material from the grinding medium is not thorough enough. This may cause the grinding medium to remain in the ground product, affecting the quality of the final product. Due to the inflexible separation scale, it is difficult to accurately control the fineness of the product, which may cause the product to not meet the predetermined technical specifications, reducing the market competitiveness of the product. The inability to timely discharge qualified products may cause local material to be overground in the stirred mill. This not only wastes energy and consumables, but also may cause overheating and wear of the equipment, reducing the stability and life of the equipment. Overgrinding also has a negative impact on the physical properties of the product, affecting the performance of the product. Due to the reduced stability of the equipment, it limits the large-scale of the stirred mill. Large-scale is usually to improve production capacity and efficiency, but if the equipment has problems in separation effect and material discharge, large-scale may further exacerbate these difficulties, limiting the performance and application range of the equipment.

[0008] In summary, the problems existing in the operation of the existing stirred mill involve grinding efficiency, material handling requirements, and separation effect. Solving these problems will be the key direction of future research and design improvement of the stirred mill technology to improve its performance and application range in different fields. SUMMARY

[0009] The present application provides a stirred ball mill integrated mill and grinding system to solve the problems of poor grinding efficiency, material handling requirements, and separation effect of the existing stirred mill.

[0010] The application is achieved in that a stirring ball mill integrated mill is characterized in that it comprises a mill barrel, a mill driving device, a grading grate, an activation ring, a stirring mechanism and a separation mechanism; the inside of the mill barrel is a cavity, and the two ends of the mill barrel are respectively provided with a feeding port and a discharging port in communication with the cavity; the mill driving device is connected with the mill barrel and drives the mill barrel to rotate around the central axis; the grading grate is arranged in the cavity of the mill barrel, and the grading grate separates the cavity into a first grinding chamber in communication with the feeding port and a second grinding chamber in communication with the discharging port; N activation rings are installed on the inner wall of the mill barrel and are axially spaced apart in the first grinding chamber, and the activation rings gradually filter the material particles in the first grinding chamber from the feeding port to the grading grate; the stirring mechanism comprises a stirring shaft parallel to the axis of the mill barrel, a stirring component installed on the stirring shaft and a stirring driving device driving the stirring shaft to rotate, and the stirring shaft and the stirring component are arranged in the second grinding chamber; the separation mechanism is arranged at the end of the second grinding chamber, and the separation mechanism is provided with separation blades separating the second grinding chamber and the discharging port.

[0011] In the above technical solution, preferably, the stirring shaft is arranged on the axis of the mill barrel, the stirring component is N disc type stirrers installed on the stirring shaft at intervals, and the stirring driving device is arranged on the outside of the mill barrel and is in transmission connection with the stirring shaft.

[0012] In the above technical solution, preferably, the rotation directions of the mill barrel and the stirring component are opposite; the mill driving device is arranged at one end of the feeding of the mill barrel, and the stirring driving device is arranged at one end of the discharging of the mill barrel.

[0013] In the above technical solution, preferably, the separation mechanism comprises a return barrel and a guide barrel, the return barrel is a sleeve-shaped component surrounding the stirring shaft, the inside of the return barrel forms a return cavity, the guide barrel is arranged on the outside of the return barrel, the guide barrel is a conical barrel-shaped component coaxial with the mill barrel, the return barrel and the guide barrel form a ring-shaped guide cavity, and the separation blades are arranged between the guide cavity and the discharging port.

[0014] In the above technical solution, preferably, the separation mechanism comprises a ring-shaped separation ring plate separating the guide cavity and the second grinding chamber, and the separation mechanism comprises a return passage plate separating the return cavity and the second grinding chamber.

[0015] In the above technical solution, preferably, the separation mechanism comprises helical guide blades, the guide blades are installed on the stirring shaft and located in the return cavity, the guide blades are driven to rotate by the stirring shaft and convey the material in the return cavity to the second grinding chamber.

[0016] In the above technical solution, preferably, the material guiding cylinder and the separation ring plate are installed on the mill cylinder, the separation blade comprises a ring cylinder shaped static blade arranged on the outer side and a ring cylinder shaped dynamic blade arranged on the inner side, the static blade is fixedly arranged at the end of the material guiding cavity, the dynamic blade is installed on the stirring shaft, and the static blade and the dynamic blade form the ring cylinder shaped separation blade which is isolated from the material guiding cavity and the discharge port and the return material cavity.

[0017] In the above technical solution, preferably, the separation ring plate is a circular ring shaped screen plate provided with screen holes; and the return material passing plate is a conical screen plate arranged on the inner side of the separation ring plate.

[0018] Advantages and effects

[0019] The stirring ball mill integrated mill of the present application exhibits a plurality of remarkable advantages and excellent effects, and provides an efficient, economical and environmentally friendly solution for the grinding field.

[0020] Firstly, by arranging the primary and secondary grinding bins, the stirring ball mill integrated mill realizes the classification of the material for gradient grinding. This precise calculation and design involve the length of the different grinding bins, the medium shape and the filling rate, so that the primary grinding bin performs coarse grinding, and the secondary grinding bin focuses on fine or superfine grinding. This design not only improves the grinding efficiency and reduces the grinding energy consumption, but also fully utilizes the design structure performance of the secondary grinding bin.

[0021] Secondly, by arranging the mill cylinder to rotate in the opposite direction of the stirrer, the tangential shear force between the edge of the stirrer and the lining plate of the inner wall of the mill cylinder is ingeniously increased. This unique design not only effectively enhances the grinding capacity, but also successfully prevents the enrichment of the material at the bottom of the mill cylinder, ensuring that the material can be fully stirred and ground.

[0022] In addition, the separation mechanism is arranged in the mill, so that the grinding and separation of the material are completed in the ball mill, without the need for an external powder classifier, thereby effectively reducing the height and floor area of the plant. At the same time, the auxiliary equipment such as the elevator and the conveying chute is cancelled, thereby saving the investment cost, reducing the equipment failure rate, and reducing the production and maintenance cost. This comprehensive design improves the overall benefit of the system.

[0023] Furthermore, the stirring ball mill integrated mill integrates the grinding and separation, reduces the process flow, and improves the system air efficiency. Compared with the traditional circle flow system, the system air consumption is reduced by 50-70%, and the system air energy consumption is successfully reduced.

[0024] More environmentally friendly is that the auxiliary equipment such as the elevator, the conveying pipe and the conveying chute is cancelled, the pollution points in the system are reduced, the amount of dust disordered emission is reduced, and the clean production and environmental protection are effectively supported.

[0025] The application is more practical in terms of grinding ultra-fine powder. By timely discharging qualified fine powder generated in the grinding process, the application successfully reduces over-grinding of materials in the ball mill, saves grinding power consumption, and provides significant energy-saving and emission-reducing benefits for production enterprises.

[0026] Finally, the stirring ball mill integrated mill of the application has the ability to adjust the material quantity in the ball mill and the finished product quantity in real time, can shorten the finished product quality adjustment time, efficiently control the finished product rate, significantly improve the production efficiency, and reduce the production cost. Overall, this innovative mill design brings comprehensive benefits to the related industry, marking an important leap in the grinding industry technology.

[0027] The second object of the application is to provide a grinding system, which comprises the stirring ball mill integrated mill described above, and further comprises a dust collector, a fan and a chimney, the discharge port of the stirring ball mill integrated mill is connected with the inlet of the dust collector, the air outlet of the dust collector is connected with the fan, and the outlet of the fan is connected with the chimney. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a structural schematic diagram of the stirring ball mill integrated mill;

[0029] Figure 2 is a structural schematic diagram of the stirring ball mill integrated mill;

[0030] Figure 3 is a structural schematic diagram of the stirring ball mill integrated mill;

[0031] Figure 4 is a structural schematic diagram of the stirring ball mill integrated mill;

[0032] Figure 5 is a structural schematic diagram of the stirring ball mill integrated mill;

[0033] Figure 6 and Figure 7 is a structural schematic diagram of the stirring ball mill integrated mill;

[0034] Figure 8 is a flow chart of the open-flow grinding system of the stirring ball mill integrated mill of Example 2;

[0035] Figure 9 is a flow chart of the circle-flow grinding system of the stirring ball mill integrated mill of Example 3;

[0036] Figure 10 is a flow chart of the roller press-stirring ball mill integrated mill combined grinding system of Example 4;

[0037] Figure 11 is a flow chart of the roller press-stirring ball mill integrated mill combined grinding system of Example 4;

[0038] Figure 12 is the embodiment six BETA grinding-stirring ball mill integrated grinding system flow chart. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0040] In order to solve the problems of poor grinding efficiency, material processing requirements and separation effect of the existing stirring mill, the present application provides a stirring ball mill integrated mill and grinding system. The stirring ball mill integrated mill has the ability to adjust the material quantity and finished product quantity in the ball mill in real time, can shorten the finished product quality adjustment time, efficiently control the finished product rate, significantly improve the production efficiency and reduce the production cost. In order to further illustrate the structure of the present application, the detailed description is as follows in combination with the drawings:

[0041] Example one

[0042] Please refer to Figures 1-7 A stirring ball mill integrated mill, comprising a mill barrel 1, a mill driving device 2, a grading grate 3, an activation ring 4, a stirring mechanism and a separation mechanism.

[0043] The inside of the mill barrel is a cavity, and the mill barrel is provided with a feed inlet 1-1 and a discharge outlet 1-2 which are in communication with the cavity at both ends of the mill barrel. Grinding media are arranged in the mill barrel. In this embodiment, the mill barrel is a cylindrical barrel, and the two ends are circular end plates. The feed inlet of the mill barrel is arranged on the circular end plate at one end of the mill barrel and located at the center of rotation of the mill barrel, and a fixed feed pipe with the connecting port upward, this end is the feed end and is connected with the feeding device. In addition to being used for feeding into the cavity, the feed inlet can also be used as an air inlet. In this embodiment, the axis of the opening at the upper end of the feed pipe is at an angle greater than 45° with the axis of the barrel, and the feed pipe adopts an external fixed structure and does not rotate with the barrel. The discharge outlet is a mill air outlet provided on the end cover of the discharge side of the mill barrel, which is horizontally arranged and connected with the dust collecting equipment at the back.

[0044] The mill driving device is connected with the mill barrel and drives the mill barrel to rotate around the central axis. In this embodiment, the mill driving device adopts a permanent magnet direct drive or a driving mode of motor plus speed reducer. The mill driving device is arranged at the feeding end of the mill barrel to drive the mill barrel to make circular motion. The two ends of the mill barrel are installed on the support seat in a rotating manner, which is a conventional technology for grinding equipment.

[0045] The grading grate is arranged in the cavity of the mill barrel, and the grading grate separates the cavity into a first grinding chamber 1-3 communicated with the feeding port and a second grinding chamber 1-4 communicated with the discharging port. In the embodiment, the grading grate is detachably fixed to the inner wall of the mill barrel, and the edge of the grading grate forms a labyrinth seal with the mill barrel to prevent the grinding medium and the material from passing through. The surface of the grading grate is provided with annular intermittent grates, and the upper and lower surfaces of the grates are parallel to the direction of the stirring shaft. The width of the grates is 0.6-0.9 times the diameter of the grinding medium. The grading grate forms a first grinding unit and a second grinding unit. The feeding end is connected to the first grinding unit based on the first grinding chamber, and the discharging end is connected to the second grinding unit based on the second grinding chamber. The inner wall of the barrel of the first grinding chamber and the second grinding chamber is provided with a grinding liner.

[0046] N activation rings are arranged on the inner wall of the mill barrel and axially spaced in the first grinding chamber. The activation rings gradually filter the material particles in the first grinding chamber from the feeding port to the grading grate. In the embodiment, the activation ring is a circular ring-shaped grate component, and is equally spaced in the first grinding chamber. From the feeding to the discharging direction, the diameter of the grates on the activation ring gradually decreases to gradually filter the material particles in the first grinding chamber.

[0047] The stirring mechanism includes a stirring shaft 5 parallel to the axis of the mill barrel, a stirring component 7 mounted on the stirring shaft, and a stirring drive device 6 for driving the stirring shaft to rotate. The stirring shaft and the stirring component are arranged in the second grinding chamber. The stirring shaft is coaxial with the mill barrel, and one end extends out of the end of the mill barrel and is connected to the stirring drive device. The stirring component is N disc-type stirrers arranged on the stirring shaft. The stirrers are uniformly arranged on the stirring shaft in sequence. The stirrers can be in the form of disc type, rod type, etc. The disc type stirrer is split type, which is divided into multiple annular disc bodies according to the diameter, and is divided into a fixed ring and multiple stirring rings from the inside to the outside in the radial direction. The fixed ring is fixed to the stirring shaft, and the stirring rings are uniformly arranged with multiple through holes in the circumferential direction. Each stirring ring is divided into two or more parts, and the stirring ring adjacent to the fixed ring is fixed to the fixed ring by radial bolts. The large-diameter stirring ring is fixed to the adjacent small-diameter stirring ring by radial bolts. According to the above manner, the fixed ring and the stirring ring are fixed and combined into a complete stirrer, which is convenient for disassembly and maintenance.

[0048] The driving device in the device is provided with two units, which are a mill driving device and a stirring driving device arranged at two ends of the mill barrel. Both of them adopt permanent magnet direct drive or motor plus speed reducer driving mode. The two driving units rotate in opposite directions. The mill driving device is arranged at one end of the mill barrel for feeding, and drives the mill barrel to make a circular motion. The stirring driving device is arranged at the discharging end of the mill barrel, and drives the stirrer to rotate.

[0049] The primary grinding unit consists of a mill drive unit, a feed inlet, a mill cylinder, a classifying grate, activation rings, and a certain amount of filling medium. Specifically, several equally spaced activation rings are installed within the primary grinding chamber, rotating along with the mill cylinder. The mill drive unit comprises a main motor, a reducer, and transmission bearings. A transmission gear is fixedly connected to the drive end of the mill drive unit, and a tire is installed around the feed end of the mill grinding chamber. The transmission gear meshes with the tire, driving the grinding chamber in a circular motion, opposite to the direction of the agitator. In this embodiment, the media filling rate of the primary grinding chamber is specifically between 30% and 60%, and is adjusted according to the characteristics of different materials. The mill cylinder's inclination angle with the horizontal direction is 0° to 5°. The ratio of the length L1 (m) of the primary grinding chamber to the length L2 (m) of the secondary grinding chamber is 0.5 to 2.5.

[0050] The secondary grinding unit consists of a secondary grinding chamber, a stirring drive device, a stirring shaft, and a stirrer. The stirring shaft is a high-speed shaft, connected at one end to the stirring drive device and supported by a bearing on the outside of the discharge port, and at the other end connected to the center hole of the disc stirrer. The stirring shaft is located at the center of the mill cylinder. The stirring disc is connected to the stirring shaft, and the stirring drive device drives the stirring shaft to rotate, which in turn drives the stirrer to rotate. In this embodiment, the media filling rate of the secondary grinding chamber is between 60% and 90%, and is adjusted according to the fineness requirements of the finished product and the characteristics of the material.

[0051] The separation mechanism is located at the end of the secondary grinding chamber, and the separation mechanism is equipped with separation blades that separate the secondary grinding chamber from the discharge port.

[0052] In this embodiment, specifically, the separation mechanism includes a return cylinder 8 and a guide cylinder 9. The return cylinder is a sleeve-shaped component that surrounds the stirring shaft. A return cavity 10 is formed on the inner side of the return cylinder. The guide cylinder is located on the outer side of the return cylinder and is a conical component that is coaxial with the mill cylinder. The return cylinder and the guide cylinder form an annular guide cavity 11. The separation blade is located between the guide cavity and the discharge port.

[0053] The separation mechanism includes an annular separation ring plate 12 between the baffle guide chamber and the secondary grinding chamber, and a return material passage plate 13 between the baffle return material chamber and the secondary grinding chamber. The separation ring plate is an annular structure of a certain width, distributed along the interior of the mill cylinder, and mounted on the stirring shaft by several supports. The supports and the stirring shaft are connected by bearings to form a rotating pair. Specifically, in this embodiment, the stirring shaft is equipped with bearings, and the supports are mounted on bearing sleeves surrounding the bearings. The separation ring plate is connected to the mill cylinder and rotates with the mill cylinder. The separation ring plate is a circular annular grate plate with a certain number of sieve holes, the size of which is 0.3 to 0.8 times the diameter of the grinding media. The return material passage plate connects to the separation ring plate. The return material pass plate is a hollow cone with a cone angle of 60–120°. Its small-diameter end is detachably fixed to the bearing sleeve of the stirring shaft, while its large-diameter end connects to the separation ring plate and is secured by a return material pass plate bracket. The surface of the return material pass plate has annular intermittent grate slots, with a slot width 0.6–0.9 times the diameter of the grinding media. The guide cylinder is a hollow cone with a cone angle of 30–60°. Its large-diameter end connects to the outer diameter of the separation ring plate and is connected to the mill cylinder, while its small-diameter end connects to the discharge end of the stationary blades.

[0054] The separation mechanism includes a spiral guide blade 14, which is mounted on the stirring shaft and located in the return chamber. The guide blade is driven to rotate by the stirring shaft and conveys the material in the return chamber to the secondary grinding chamber. The separator's return guide blade is detachably fixed on the stirring shaft, is spiral in shape, and its upper end can be connected to the lower part of the moving blade, while its lower end extends to the return passage plate.

[0055] The feed guide cylinder and the separation ring plate are installed in the mill cylinder. The separation blades include annular cylindrical stationary blades 15 on the outer side and annular cylindrical moving blades 16 on the inner side. The stationary blades are fixedly installed at the end of the feed guide cavity, and the moving blades are installed on the stirring shaft. The stationary blades and the moving blades form annular cylindrical separation blades that isolate the feed guide cavity from the discharge port and the return cavity. In this embodiment, the stationary blades are circularly distributed and are fixed blades connected to the feed guide cylinder. The stationary blades are composed of multiple guide vanes with equal spacing and a certain angle, and the guide vane angle of the stationary blades is 10-50°. The moving blades, like the stationary blades, are located inside the stationary blades and are also composed of a certain number of blades with equal spacing and a certain angle. They are installed on the stirring shaft through a support frame and rotate with the stirring shaft to perform dynamic powder selection. One end of the return cylinder is connected to the lower part of the stationary blades in a labyrinthine manner, and the other end is connected to the media isolation plate.

[0056] Material is fed into the primary grinding chamber through the feed inlet at the center of the feed end. Through the rotation of the mill cylinder, collision and crushing with the grinding media, and classification grinding by the activation ring, the material particles are ground to a certain fineness and then enter the secondary grinding chamber through the classifying grate. The central stirring shaft inside the secondary mill cylinder drives the agitator, causing the secondary grinding media to undergo multi-dimensional cyclic and rotational motion under the action of the agitator. The material particles are then further ground under this action.

[0057] The feed inlet on one side of the feeding end serves as an air inlet, allowing cold or hot air to enter. The material, under the influence of airflow and agitation, gradually moves to the discharge end, where it is separated from the grinding media by a separation mechanism. The grinding media, blocked by the separation ring plate, remains inside the mill. Finely ground material is discharged through the separation mechanism, while coarse powder is returned to the grinding chamber via guide blades for further grinding. The separation mechanism allows for flexible adjustment of the fineness of the finished product by adjusting the gap, angle, and diameter of the moving and stationary blades. This, in turn, adjusts the grinding time within the mill by regulating the discharge speed, thus flexibly regulating the fineness of the output product. The qualified product discharged from the separation mechanism enters the finished product collection stage through the discharge port. The cold air entering the mill, after passing through the separation mechanism, is discharged through the air outlet above the discharge port.

[0058] The design parameters for the primary and secondary grinding units are as follows:

[0059] The process structural parameters of the primary grinding chamber include: mill cylinder diameter D. T (m), Effective volume of primary grinding chamber V i (m 3 ), Effective inner diameter D of the primary grinding chamber i (m), effective length L0 (m) of primary grinding chamber, media filling rate The mill cylinder rotation speed n (rpm) and the power required by the equipment P0 (kW).

[0060] The design basis for the process structure parameters of the primary grinding chamber is as follows:

[0061] 1) The rotational speed of the mill cylinder is:

[0062]

[0063] 2) The length L1 of the primary grinding chamber and the diameter D of the mill cylinder T The ratio is 3 to 5.

[0064] 3) Effective inner diameter D of the primary grinding chamber i

[0065] D i =D T -0.13~0.15

[0066] 4) Effective length L0 of the primary grinding chamber

[0067] L0 = L1 - 0.25 ~ 0.50

[0068] 5) Effective volume V of the primary grinding chamber i

[0069] V i =π×D T ×D T ×L0÷4

[0070] 6) The theoretically calculated power P0 of the mill drive unit that drives the mill cylinder to rotate is:

[0071]

[0072] The process structure parameters of the secondary grinding chamber include: grinding media diameter d J (m), grinding media filling rate Secondary grinding chamber length L2 (m), agitator diameter d B (m), agitator through-hole area S (m²), agitator edge linear velocity v (m / s), agitator rotation speed n (r / s), return material through-plate cone angle β (°), return material through-plate grate width d⁴ (m), equipment power required P (kW), and mill cylinder diameter D. T (m), mass of grinding media m J (kg), Total mass of mixer (m) B (kg), friction coefficient μ of grinding media, and length H1 (m) of secondary grinding zone.

[0073] The design basis for the process structure parameters of the secondary grinding chamber is as follows:

[0074] 1) Diameter d of the secondary grinding media J

[0075] grinding media diameter d J =2~10mm;

[0076] 2) Secondary grinding media filling rate

[0077] Grinding media filling rate

[0078] 3) Length L2 of the secondary mill cylinder

[0079] Mill cylinder length L2 = D T ~5D T ;

[0080] 4) Length H1 of the secondary grinding zone of the mill cylinder

[0081] The length of the grinding zone in the mill cylinder is H1 = 0.6L2 ~ 0.9L2;

[0082] 5) Agitator diameter d B

[0083] stirrer diameter d B :D T —8d J ≤d B ≤D T —4d J ;

[0084] 6) Area S of a single through-hole in the stirrer

[0085] The area of ​​a single through-hole in the stirrer is S = 0.0125πd B 2 ~0.025πd B 2 ;

[0086] 7) Linear velocity v at the edge of the stirrer

[0087] The linear velocity at the edge of the stirrer is v = 8~22 m / s;

[0088] 8) Stirrer speed n

[0089] Stirrer rotation speed n = v / πd B ;

[0090] 9) Cone angle β of the separation mechanism

[0091] The cone angle of the separation mechanism is β = 60°~120°;

[0092] 10) Grate width d4 of the separation mechanism

[0093] The width of the grate slot in the separation mechanism is d4 = 0.6d. J ~0.9d J ;

[0094] 11) Power required by the equipment P

[0095] Equipment power requirements

[0096] Example 2

[0097] Please see Figure 8 An integrated stirred ball mill grinding system for graded gradient grinding of ultrafine materials. It includes an integrated stirred ball mill, a dust collector 17, a fan 18, and a chimney 19. The discharge port of the integrated stirred ball mill is connected to the inlet of the dust collector, the air outlet of the dust collector is connected to the fan, and the outlet of the fan is connected to the chimney.

[0098] By utilizing the ball mill's strong adaptability to material particle size and adding several activation rings and grading grates, local gradient grinding is carried out in the first grinding chamber. Taking advantage of the high filling rate and efficient fine grinding characteristics of the stirred mill, the semi-finished material is subjected to secondary ultrafine grinding. This not only improves grinding efficiency but also allows for adjustment of the fineness and specific surface area of ​​the finished product according to requirements.

[0099] Example 3

[0100] Please see Figure 9 For applications requiring multiple fineness levels of finished products, the following grinding process can be optimized based on Example 2, including an integrated stirred ball mill, a classifier 20, a dust collector, a fan, and a chimney. The discharge port of the integrated stirred ball mill is connected to the inlet of the classifier, the outlet of the classifier is connected to the inlet of the dust collector, the outlet of the dust collector is connected to the fan, and the outlet of the fan is connected to the chimney. The coarse material outlet of the classifier can be returned to the mill's feed buffer chamber 21 for further grinding, or it can be used as a finished product. When used as a finished product, in... Figure 9 The air classifier shown has an additional opening at its separate discharge port as the finished product outlet, and the material collected by the dust collector is used as the finer finished product.

[0101] A classifier is added to the process flow. As needed, the fineness and specific surface area of ​​the finished product can be adjusted by changing the rotation speed of the classifier. Coarse material in the classifier can be returned to the mill for further grinding, thereby improving grinding efficiency.

[0102] Example 4

[0103] Please see Figure 10 Further designing Embodiment 3, in this embodiment, the integrated stirred ball mill is combined with a roller press 22, a combined classifier 23, and a cyclone separator 24. The discharge port of the roller press is connected to the inlet of the combined classifier via an elevator. The bottom discharge port of the combined classifier is connected to a feeding buffer bin. The top discharge port of the combined classifier is connected to the inlet of the cyclone separator. The bottom discharge port of the cyclone separator is connected to the inlet of the integrated stirred ball mill. The discharge port of the integrated stirred ball mill is connected to the inlet of the dust collector. The air outlet of the dust collector is connected to a fan. The fan outlet is connected to a chimney.

[0104] This process is suitable for cement grinding. Because the particle size distribution of cement particles is very demanding, especially the water requirement, the particle size distribution in the finished cement particles can only fluctuate within a small range. Using this grinding system, the content of fine powder in cement particles can be increased and the particle size distribution can be adjusted.

[0105] Example 5

[0106] Please see Figure 11In this embodiment, the integrated ball mill is combined with the vertical mill 25 and the dust collector. The coarse powder returned from the vertical mill classifier is discharged outside the mill and mixed with the coarse powder discharged from the vertical mill in a certain proportion. It is then connected to the feed inlet of the elevator, and the discharge outlet of the elevator is connected to the feed inlet of the grinding system.

[0107] By removing the coarse material from the classifier in the vertical mill and using this system for further grinding, not only can the internal circulation volume of the vertical mill be reduced, but the particle size of the coarse particles removed from the classifier also meets the requirements of this system for material particle size. The two systems can perform graded grinding, thereby improving grinding efficiency.

[0108] Example 6

[0109] Please see Figure 12 In this embodiment, the system also includes a BETA mill 26, a V-type classifier 27, and a cyclone separator assembly for preparing ultrafine materials. The BETA mill outlet is connected to the V-type classifier inlet via an elevator. The bottom outlet of the V-type classifier is connected to the inlet of the integrated stirred ball mill. The top outlet of the V-type classifier is connected to the cyclone separator inlet. The bottom outlet of the cyclone separator is connected to the inlet of the integrated stirred ball mill. This assembly can also be used to produce a finished product of a certain fineness.

[0110] Utilizing the high-efficiency grinding characteristics of the BETA mill, the primary grinding is performed using the BETA mill, with V-separation separating out finer finished particles. The coarse powder is then introduced into this grinding system for secondary grinding. This combined grinding system is suitable for specific surface areas >1000 cm². 2 / g finished product requirements.

[0111] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An integrated stirred ball mill, characterized in that... include: The mill cylinder has an interior cavity, and the mill cylinder has an inlet and an outlet at both ends that communicate with the cavity. A mill drive unit is connected to the mill cylinder and drives the mill cylinder to rotate around the central axis. The grading grate is installed in the cavity of the mill cylinder, dividing the cavity into a primary grinding chamber connected to the feed inlet and a secondary grinding chamber connected to the discharge outlet. Activation rings: N activation rings are installed on the inner wall of the mill cylinder and are axially spaced in the primary grinding chamber. The activation rings filter the material particles in the primary grinding chamber step by step from the feed inlet to the grading grate. The activation rings are annular grate components and are equally spaced in the primary grinding chamber. From the feed to the discharge direction, the diameter of the grate slots on the activation rings decreases step by step. The stirring mechanism includes a stirring shaft with its axis parallel to the axis of the mill cylinder, a stirring component installed on the stirring shaft, and a stirring drive device for driving the stirring shaft to rotate. The stirring shaft and the stirring component are located in the secondary grinding chamber. The separation mechanism is located at the end of the secondary grinding chamber and is equipped with separation blades that separate the secondary grinding chamber from the discharge port. The separation mechanism includes a return cylinder and a guide cylinder. The return cylinder is a sleeve-shaped component surrounding the stirring shaft, with a return cavity formed on its inner side. The guide cylinder is located on the outer side of the return cylinder and is a conical component coaxial with the mill body. The return cylinder and the guide cylinder form an annular guide cavity. Separating blades are located between the guide cavity and the discharge port. The separation mechanism also includes an annular separation ring plate between the guide cavity and the secondary grinding chamber, and a return passage plate between the return cavity and the secondary grinding chamber. The separation mechanism includes spiral guide blades mounted on the stirring shaft and located in the return cavity. The guide blades are driven to rotate by the stirring shaft and transport the material in the return cavity to the secondary grinding chamber. The feed guide cylinder and the separation ring plate are installed in the mill cylinder. The separation blades include an annular stationary blades on the outer side and an annular moving blades on the inner side. The stationary blades are fixedly installed at the end of the feed guide cavity, and the moving blades are installed on the stirring shaft. The stationary blades and the moving blades form an annular separation blade that isolates the feed guide cavity from the discharge port and the return cavity.

2. The integrated stirred ball mill according to claim 1, characterized in that: The stirring shaft is located on the axis of the mill cylinder. The stirring components are N disc-type stirrers that are spaced apart on the stirring shaft. The stirring drive device is located on the outer side of the mill cylinder and is connected to the stirring shaft for transmission.

3. The integrated stirred ball mill according to claim 2, characterized in that: The mill cylinder and the stirring component rotate in opposite directions; the mill drive device is located at the feeding end of the mill cylinder, and the stirring drive device is located at the discharging end of the mill cylinder.

4. The integrated stirred ball mill according to claim 3, characterized in that: The separating ring plate is a circular annular grate plate with sieve holes; the return material pass plate is a conical grate plate located inside the separating ring plate.

5. A grinding system, characterized in that: The grinding system includes the integrated stirred ball mill of any one of claims 1-4, and further includes a dust collector, a fan and a chimney. The discharge port of the integrated stirred ball mill is connected to the inlet of the dust collector, the air outlet of the dust collector is connected to the fan, and the outlet of the fan is connected to the chimney.

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