Mineral powder production system

Abstract

The utility model relates to a mineral powder production system which comprises a first raw material bin and a second raw material bin, the first raw material bin is connected with a raw material weighing feeder, the discharging end of the raw material weighing feeder is connected with a chute, and the chute is connected with a grinding machine; the second raw material bin is connected with a crusher, the crusher is connected with a powder concentrator, a coarse powder bin and a fine powder bin are arranged at the downstream of the powder concentrator, powder in the fine powder bin is stirred by adding water through a first kneading machine, and superfine powder is obtained after stirring and fine grinding; the powder in the coarse powder bin is mixed and stirred with the superfine powder through the second kneading machine, and the mixed powder obtained after mixing and stirring is conveyed to the chute, mixed with the raw material powder and then introduced into the grinding machine. The particle composition state of the powder can be improved, the particle size distribution of the powder is obviously changed, the peak width on a particle size distribution diagram is widened, the peak height on the particle size distribution diagram is reduced, the level difference is increased, and higher bulk density is achieved.

Description

Technical Field

[0001] The present application relates to the field of mineral powder production, and more particularly, to a mineral powder production system. Background Art

[0002] The rod mill or ball mill itself has no means to adjust the particle size distribution. Most of the powder particles are in a normal distribution state. Refer to Figure 1 the particle size distribution diagram therein, which is a particle size grading state with more in the middle and less on both sides, that is, the particles with medium particle size occupy the vast majority of the content, while the content of large particle size particles and small particle size particles is relatively low.

[0003] Theoretically speaking from the packing theory, the particle size grading state of normal distribution violates the high-density packing theory. In an ideal state, it should be a particle size grading state with more on both sides and less in the middle.

[0004] The particle size distribution directly affects the material concentration and subsequent processing costs. A low concentration is prone to precipitation, the equipment is prone to wear, the equipment of the subsequent processing unit is huge, and it is necessary to separately treat the excess wastewater.

[0005] In view of this, the present utility model is specifically proposed. Content of the Utility Model

[0006] The purpose of the present application is to provide a mineral powder production system, which can improve the particle size grading state of the powder, make the particle size distribution of the powder change significantly, widen the peak width on the particle size distribution diagram, reduce the peak height on the particle size distribution diagram, increase the range, and achieve a higher packing density.

[0007] To achieve the above object, the present utility model provides a mineral powder production system, including: a first raw material bin and a second raw material bin, the first raw material bin is connected with a raw material weighing feeder, the discharging end of the raw material weighing feeder is connected with a chute, and the chute is connected with a grinder;

[0008] The second raw material bin is connected with a crusher, the crusher is connected with a powder separator, and a coarse powder bin and a fine powder bin are arranged downstream of the powder separator. The powder in the fine powder bin is stirred with water by a first kneader, and after stirring, it is finely ground to obtain ultrafine powder;

[0009] The powder in the coarse powder bin is mixed and stirred with the ultrafine powder by a second kneader, and the mixed powder after mixing and stirring is transported to the chute and mixed with the raw material powder and then fed into the grinder.

[0010] In a further embodiment, the second raw material bin is connected with a crushing weighing feeder, and the crushing weighing feeder is arranged between the second raw material bin and the crusher.

[0011] In a further embodiment, the discharge end of the crusher is connected to the powder separator, and the powder separator includes a vibrating screen capable of screening the crushed powder, and the vibrating screen includes two layers of screens with different pore sizes; alternatively, the powder separator includes an air classifier.

[0012] In a further embodiment, the powder separator includes two hoppers, namely a coarse powder hopper and a fine powder hopper respectively. The coarse powder bin is connected to the discharge end of the coarse powder hopper, and the fine powder bin is connected to the discharge end of the fine powder hopper.

[0013] In a further embodiment, the first kneader is externally connected with a process water pipeline, and the first kneader is connected with a coarse material tank through a pipeline. The coarse material tank is connected with a coarse material pump through a pipeline, and the coarse material pump is connected with a fine grinder through a pipeline.

[0014] In a further embodiment, the fine grinder is connected with the second kneader through a pipeline, and is used for mixing and stirring the ultrafine powder obtained by fine grinding with the powder in the coarse powder bin.

[0015] In a further embodiment, the second kneader is connected with a fine material tank through a pipeline, and is used for outputting the mixed powder prepared by mixing and stirring the second kneader to the fine material tank;

[0016] The fine material tank is connected with a fine material pump through a pipeline, and the fine material pump is connected with the chute through a pipeline, and is used for transporting the mixed powder to the chute.

[0017] In a further embodiment, the chute is externally connected with a process water pipeline, and is used for adding water to the raw materials in the first raw material bin and inputting the raw materials and the mixed powder into the grinder together.

[0018] In a further embodiment, the grinder is connected to the discharge end of the chute, and is used for receiving the raw material powder and the mixed powder and performing mixed grinding. The grinder is connected with a drum screen, and the drum screen is used for screening and filtering the product powder after mixed grinding.

[0019] In a further embodiment, the drum screen is connected with a product tank through a pipeline, and the product tank is used for receiving and storing the product powder after screening and filtering.

[0020] By connecting the first raw material bin to the raw material weighing feeder and connecting the discharge end of the raw material weighing feeder to the chute, and combining the connection between the chute and the grinder, part of the raw materials can be introduced into the grinder through the chute for normal grinding.

[0021] The second raw material bin is connected with a crusher, which can crush another part of the raw materials. Combining with the powder separator connected to the crusher, the crushed powder can be screened to obtain coarse powder and fine powder respectively.

[0022] The coarse powder bin and the fine powder bin arranged downstream of the powder separator can be used to receive the coarse powder and the fine powder obtained after sieving respectively, and are conducive to subsequent targeted treatment.

[0023] The fine powder in the fine powder bin is stirred with water by the first kneader, and ultrafine powder is obtained after fine grinding after stirring.

[0024] The coarse powder in the coarse powder bin is mixed and stirred with the ultrafine powder obtained by fine grinding by the second kneader to obtain a mixed powder of coarse powder particles and fine powder particles. The mixed powder after mixing and stirring, that is, the mixture of the unground coarse powder and the ground ultrafine powder, is conveyed to the chute and mixed with the raw material powder that has not been crushed and then fed into the grinder, which can realize the addition of coarse particles and fine particles on the premise of normal grinding.

[0025] In the mineral powder production system of the present utility model, by crushing some raw materials and finely grinding some of the crushed powders, large particle size particles and small particle size particles can be obtained. Further, the raw materials and different materials are mixed and then fed into a rod mill or a ball mill to change the particle size distribution of the powders ground by the existing rod mill or ball mill. By increasing the content of large particle size particles and small particle size particles, the particle grading state is more inclined to the ideal state, the particle packing density is increased as a whole, and then the material concentration is increased, saving energy consumption for subsequent processes and reducing production costs.

[0026] Other features and advantages of the present application will be described in detail in the subsequent specific implementation part. Brief Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0028] Figure 1 It is a particle size distribution diagram of the powder particles entering the grinder in the prior art;

[0029] Figure 2 It is a schematic diagram of the overall structure of the mineral powder production system in the present application;

[0030] Figure 3 It is a particle size distribution diagram of the powder particles entering the grinder in the present application.

[0031] Icon:

[0032] 10 - First raw material bin; 11 - Raw material weighing feeder; 12 - Chute;

[0033] 20 - Second raw material bin; 21 - Crusher; 22 - Powder separator; 22a - Coarse powder hopper; 22b - Fine powder hopper; 23 - Crushing and weighing feeder

[0034] 30 - Grinder; 31 - Drum screen

[0035] 40 - Coarse powder bin; 41 - Second kneader; 42 - Fine material chute; 43 - Fine material pump

[0036] 50 - Fine powder bin; 51 - First kneader; 52 - Coarse material chute; 53 - Coarse material pump

[0037] 60 - Process water pipeline

[0038] 70 - Fine grinder

[0039] 80 - Product tank Detailed implementation mode

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, rather than all of them. Usually, the components of the embodiments of this application described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0041] In the description of this application, it should be noted that the orientation or positional relationship indicated by terms such as "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this application is usually placed when in use. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to this application. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0042] In the description of this application, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "connected" 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 directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] The mineral powder production system in this application is mainly used in the grinding process of mineral powder in a rod mill or a ball mill. By adding coarse particles and ultrafine particles to the grinding material on the premise of normal grinding, a means of adjusting the particle size distribution is given to the rod mill or the ball mill, thereby increasing the material concentration of the product powder obtained in the grinding process.

[0044] See Figure 2 , the mineral powder production system in this application includes: a first raw material bin 10 and a second raw material bin 20. The first raw material bin 10 is connected to a raw material weighing feeder 11. The discharge end of the raw material weighing feeder 11 is connected to a chute 12, and the chute 12 is connected to a grinding machine 30;

[0045] The second raw material bin 20 is connected to a crusher 21. The crusher 21 is connected to a powder separator 22. A coarse powder bin 40 and a fine powder bin 50 are arranged downstream of the powder separator 22. The powder in the fine powder bin 50 is stirred with water by a first kneader 51 and finely ground after stirring to obtain ultrafine powder;

[0046] The powder in the coarse powder bin 40 is mixed and stirred with the ultrafine powder by a second kneader 41. The mixed powder after mixing and stirring is transported to the chute 12 and mixed with the raw material powder and then fed into the grinding machine 30.

[0047] In this utility model, the raw material is divided into two parts. One part enters the grinding machine 30 of the rod mill or the ball mill for normal grinding. The other part is crushed and then sorted to obtain coarse powder and fine powder. The ultrafine powder obtained by further fine grinding the fine powder is mixed with the coarse powder and then added to the uncrushed raw material for grinding, so as to add coarse particles and ultrafine particles to the grinding material on the premise of normal grinding, thereby realizing the adjustment of the grinding particle size distribution.

[0048] The raw material weighing feeder 11 connected to the first raw material bin 10 can quantitatively feed part of the raw material into the grinding machine 30, and the raw material powder fed quantitatively is fed into the grinding machine 30 through the chute 12.

[0049] The crusher 21 connected to the second raw material bin 20 mainly crushes the other part of the raw material to prepare coarse particle powder and ultrafine particle powder. This part of the raw material accounts for 10 - 40% of the total amount of the two parts of the raw material, and is mainly used to crush it into particles below 20 mesh.

[0050] The powder after crushing is fed into the powder separator 22 connected to the crusher 21. After sorting or screening, coarse particle powder and ultrafine particle powder are obtained and respectively transported to the coarse powder bin 40 and the fine powder bin 50 downstream of the powder separator 22.

[0051] The powder separator 22 sorts the crushed powder, mainly used to classify the powder into coarse large-sized particles of 20-100 mesh and fine small-sized particles with an average particle size of about 60 mesh below 100 mesh. The ratio of the two can be adjusted by the frequency conversion motor speed of the crusher 21, generally controlled between 5:5.

[0052] From the perspective of the preparation of ultrafine particle powder, the fine powder below 100 mesh in the fine powder bin 50 is stirred with water by the first kneader 51, and after stirring, it is finely ground to obtain ultrafine powder. Under the mixing and stirring action of the first kneader 51, the fine powder is sent to the ultrafine grinder 70 for ultrafine grinding to obtain ultrafine powder with an average particle size of 300 mesh of 200-600 mesh.

[0053] To facilitate the transportation of the 20-100 mesh coarse powder and its mixing with the ultrafine powder, the coarse powder in the coarse powder bin 40 is mixed and stirred with the 200-600 mesh ultrafine powder under the mixing and stirring action of the second kneader 41 to obtain a well-fluidized and evenly mixed powder. The mixed powder after being mixed and stirred by the second kneader 41, that is, the mixed powder including coarse powder particles and ultrafine particles, is transported to the chute 12 and mixed with the uncrushed raw material powder, and finally transported and fed into the grinder 30 of the rod mill or ball mill for grinding.

[0054] During the process of feeding into the grinder 30, the mixed powder can be sent to the overflow weir of the rod mill or ball mill to be quickly mixed with the uncrushed raw materials being normally ground in the cylinder of the grinder 30, and then overflow through the overflow weir, and finally pass through the drum screen 31 for filtration to obtain the final product powder.

[0055] Combined with Figure 1 and Figure 3 , Figure 3 The curves located on both sides of the original particle size distribution curve in, the left curve represents the content curve of the ultrafine particle size particles in this application, and the right curve is the content curve of the coarse particle size particles.

[0056] In the mineral powder production system of this application, one is to precisely crush the minerals through the crusher 21, and then perform air separation or physical screening through the powder separator 22. Air separation utilizes the relationship between wind speed and gravity, and physical screening utilizes the particle size of itself to classify the crushed mineral particles by size, obtaining coarse particle powder minerals of 20-100 mesh, and bringing them into the cylinder of the rod mill or ball mill through the ultrafine particle powder minerals, increasing the proportion of large particles in the powder and reducing the viscosity of the powder. The mechanism of this part is that the larger the specific surface area of the minerals, the higher the viscosity, the worse the fluidity, and it is difficult to further increase the powder concentration, so a certain proportion of large particle coarse powder needs to be added.

[0057] Second, the fine particle powder with a classification of less than 100 mesh by the powder separator 22 is stirred and mixed with water in the first kneader 51 and finely ground in the fine grinder 70. The particle size of the obtained ultra-fine powder is controlled to be within 200 - 600 mesh, with an average particle size of about 300 mesh. Then, the ultra-fine powder and the coarse powder are stirred and mixed in the second kneader 41. The main purpose is to convey the large-particle coarse powder by the ultra-fine powder. After stirring and mixing in the second kneader 41, a mixed powder is obtained. The mixed powder is then conveyed through the chute 12 to the inner cylinder of the overflow weir of the rod mill or ball mill, and is quickly mixed with the unbroken raw materials.

[0058] The powder mixed into the rod mill or ball mill overflows and enters the drum screen 31 for filtration after re-mixing, obtaining the final product powder. Since both coarse particles and ultra-fine particles are added to the powder in the grinder 30, different components are increased, thus changing the particle size distribution of the rod mill or ball mill and increasing the overall powder concentration.

[0059] The main purpose of the present utility model is to improve the overall concentration of the powder by specifically treating different raw materials. For high-concentration powder, the main factors of high-density accumulation of particulate matter need to be solved. Only by achieving high-density accumulation of powder particles can the concentration of the powder be increased.

[0060] By adding coarse particles and ultra-fine particles to the ground powder, it is possible to essentially widen the grade difference of the particle size distribution, endowing the grinding equipment with a means of adjusting the particle size distribution. At the same time, the original particle size distribution is changed, the powder concentration is increased, and technical problems such as high production energy consumption, high environmental protection pressure, and heavy subsequent treatment load caused by low powder concentration are avoided.

[0061] In one specific embodiment, the second raw material bin 20 is connected with a crushing and weighing feeder 23. The crushing and weighing feeder 23 is arranged between the second raw material bin 20 and the crusher 21, and can realize quantitative feeding of the crushed material. Combined with the raw material weighing feeder 11, the material amounts of the two processed raw materials can be effectively allocated.

[0062] The discharge end of the crusher 21 is connected with the powder separator 22. The powder separator 22 mainly receives the crushed material and performs sorting on it at different particle size angles. The powder separator 22 includes different structural forms, which can be a vibrating screen capable of screening the crushed powder. The vibrating screen includes two layers of screens with different pore sizes, and can screen the crushed powder through the screens with different pore sizes.

[0063] Alternatively, the powder separator 22 includes a pneumatic classifier. Under the action of pneumatic separation, the crushed powder is sorted by utilizing the relationship between the wind speed and gravity, obtaining coarse particle powder with a particle size of 20 - 100 mesh and fine particle powder with a particle size of less than 100 mesh respectively.

[0064] The classifier 22 includes two hoppers, namely a coarse powder hopper 22a and a fine powder hopper 22b respectively. The coarse powder bin 40 is connected to the discharge end of the coarse powder hopper 22a. The coarse powder bin 40 is mainly used to receive and store coarse powder with a particle size of 20 - 100 mesh, and convey the coarse powder to the second kneader 41.

[0065] The fine powder bin 50 is connected to the discharge end of the fine powder hopper 22b. The fine powder bin 50 is mainly used to receive and store fine powder with a particle size less than 100 mesh, and convey the fine powder to the first kneader 51.

[0066] The first kneader 51 is externally connected with a process water pipeline 60, which is mainly used to supply water to the fine powder and stir and mix it under the action of the first kneader 51. The first kneader 51 is connected with a coarse material tank 52 through a pipeline, and the fine powder after stirring and mixing is fed into the coarse material tank 52 for storage.

[0067] The coarse material tank 52 is connected with a coarse material pump 53 through a pipeline, and the coarse material pump 53 is connected with a fine grinder 70 through a pipeline. The fine powder is exported from the coarse material tank 52 by the coarse material pump 53 and pumped into the fine grinder 70 under pressure for fine grinding, and the fine powder with a particle size less than 100 mesh is ground into ultra - fine powder with a particle size of 200 - 600 mesh and an average particle size of about 300 mesh.

[0068] The fine grinder 70 is connected with the second kneader 41 through a pipeline, and is used to mix and stir the ultra - fine powder obtained by fine grinding with the coarse powder in the coarse powder bin 40.

[0069] The second kneader 41 is connected with a fine material tank 42 through a pipeline. The coarse powder and the ultra - fine powder are stirred and mixed in the second kneader 41, and the coarse powder is driven by the ultra - fine powder with good fluidity into the fine material tank 42.

[0070] After the coarse powder and the ultra - fine powder are stirred and mixed in the second kneader 41, a mixed powder of coarse particles and ultra - fine particles is obtained, and the mixed powder is output to the fine material tank 42 for storage.

[0071] The fine material tank 42 is connected with a fine material pump 43 through a pipeline, and the fine material pump 43 is connected with the chute 12 through a pipeline. The mixed powder in the fine material tank 42 is pumped into the chute 12 under pressure by the fine material pump 43, and the mixed powder is then conveyed to the inner cylinder of the overflow weir of the rod mill or ball mill through the chute 12, and is quickly mixed with the uncrushed raw materials to finally obtain the product powder.

[0072] The chute 12 is externally connected with a process water pipeline 60, which is used to add water to the raw materials in the first raw material bin 10 for mixing, facilitating the grinding of the raw materials, and facilitating their input into the grinder 30 together with the mixed powder, and at the same time can have a good flushing effect on the chute 12.

[0073] The grinder 30 is connected to the discharge end of the chute 12 and is used to receive raw material powder and mixed powder and perform mixing and grinding. During the grinding process, the unbroken part of the raw material powder is first normally ground after adding water. The discharge end of the chute 12 is connected to the inner side of the overflow weir of the grinder 30. The mixed powder transported by the fine material pump 43 is transported through the chute 12 and enters the drum inside the overflow weir of the grinder 30, and then mixing and grinding are carried out.

[0074] The grinder 30 is connected with a drum sieve 31. The drum sieve 31 is used for screening and filtering the product powder after mixing and grinding to finally obtain the product powder. The target powder after mixing and grinding enters the drum sieve 31 in the form of overflow and is filtered in the drum sieve 31 to obtain the final product powder.

[0075] The drum sieve 31 is connected to a product tank 80 through a pipeline. The product tank 80 is used to receive and store the product powder after screening and filtering.

[0076] The mineral powder production system in the present utility model can obtain product powder with an ideal particle size distribution, effectively improve the particle packing density of the material, and overall improve the concentration of the product powder. Furthermore, from another perspective, small-sized particles can effectively fill the voids between large-sized particles, improving the overall fluidity of the product powder.

[0077] It should be noted that, without conflict, the features in the embodiments of the present application can be combined with each other.

[0078] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A mineral powder production system, characterized in that, Including: A first raw material bin and a second raw material bin. The first raw material bin is connected to a raw material weighing feeder. The discharge end of the raw material weighing feeder is connected to a chute, and the chute is connected to a grinder. The second raw material bin is connected to a crusher. The crusher is connected to a powder separator. A coarse powder bin and a fine powder bin are arranged downstream of the powder separator. The powder in the fine powder bin is stirred with water by a first kneader, and after stirring, it is finely ground to obtain ultrafine powder. The powder in the coarse powder bin is mixed and stirred with the ultrafine powder by a second kneader. The mixed powder after mixing and stirring is transported to the chute and mixed with the raw material powder and then fed into the grinder.

2. The mineral powder production system according to claim 1, characterized in that, The second raw material bin is connected to a crushing and weighing feeder, and the crushing and weighing feeder is arranged between the second raw material bin and the crusher.

3. The mineral powder production system according to claim 2, wherein The discharge end of the crusher is connected to the powder separator. The powder separator includes a vibrating screen capable of screening the crushed powder, and the vibrating screen includes two layers of screens with different pore sizes; alternatively, the powder separator includes an air classifier.

4. The mineral powder production system according to claim 2, characterized in that, The powder separator includes two hoppers, namely a coarse powder hopper and a fine powder hopper respectively. The coarse powder bin is connected to the discharge end of the coarse powder hopper, and the fine powder bin is connected to the discharge end of the fine powder hopper.

5. The mineral powder production system according to claim 1, characterized in that, The first kneader is externally connected to a process water pipeline, and the first kneader is connected to a coarse material tank through a pipeline. The coarse material tank is connected to a coarse material pump through a pipeline, and the coarse material pump is connected to a fine grinder through a pipeline.

6. The mineral powder production system according to claim 5, characterized in that, The fine grinder is connected to the second kneader through a pipeline, and is used to mix and stir the ultrafine powder obtained by fine grinding with the powder in the coarse powder bin.

7. The mineral powder production system according to claim 1, characterized in that, The second kneader is connected to a fine material tank through a pipeline, and is used to output the mixed powder prepared by mixing and stirring by the second kneader to the fine material tank. The fine material tank is connected to a fine material pump through a pipeline, and the fine material pump is connected to the chute through a pipeline, and is used to transport the mixed powder to the chute.

8. The mineral powder production system according to claim 1, characterized in that, The chute is externally connected to a process water pipeline, and is used to add water to the raw materials in the first raw material bin and input them into the grinder together with the mixed powder.

9. The mineral powder production system according to claim 8, characterized in that, The grinder is connected to the discharge end of the chute, and is used to receive the raw material powder and the mixed powder and perform mixed grinding. The grinder is connected to a drum screen, and the drum screen is used to screen and filter the product powder after mixed grinding.

10. The mineral powder production system according to claim 9, characterized in that, The drum screen is connected to a product tank through a pipeline, and the product tank is used to receive and store the product powder after screening and filtering.

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