Heavy calcium powder production system

Abstract

The invention discloses a heavy calcium powder production system, which relates to the technical field of heavy calcium carbonate processing, and comprises a vertical mill, a dust collector, a first pneumatic conveying pipeline, a homogenizer, a second pneumatic conveying pipeline, a first grader, a third pneumatic conveying pipeline, a second grader and a first finished product bin which are connected in sequence, each pneumatic conveying pipeline supplies air through a central air supply system; the central air supply system comprises an air compressor, a first air storage tank, a dust removal filter, an oil removal filter and an adsorption type dryer which are sequentially connected, and an air outlet of the adsorption type dryer is connected with the pneumatic conveying pipelines. The homogenizer is arranged between the grinding system and the grading system, the pneumatic conveying pipeline is connected with main equipment, meanwhile, the central air supply system is adopted for providing clean air for the pneumatic conveying pipeline, the phenomenon of heavy calcium powder agglomeration can be effectively reduced, and therefore the grading effect of the heavy calcium powder and the color uniformity of the heavy calcium powder are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of heavy calcium carbonate processing, and in particular to a heavy calcium carbonate powder production system. Background Art

[0002] Heavy calcium carbonate, referred to as heavy calcium powder, is a commonly used powdered inorganic filler, usually made by grinding natural carbonate minerals such as calcite, marble, limestone, etc.

[0003] At present, the existing heavy calcium powder production system is relatively simple, mainly composed of a grinding system and a grading system, which are used to realize the processing of ore into powder and the grading of powder; among them, the grinding system generally includes a grinding mill, a cyclone separator and a dust collector, and the grading system generally includes a first classifier and a second classifier. The various devices are usually connected by a spiral conveying pipe and a sealed pipe.

[0004] However, during the operation of the existing heavy calcium powder production system, the heavy calcium powder is prone to agglomeration, which will seriously affect the classification effect of the heavy calcium powder and also cause uneven color of the heavy calcium powder. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art. The present invention provides a heavy calcium powder production system, which can effectively reduce the agglomeration of heavy calcium powder by arranging a homogenizer between the grinding system and the grading system, and using a pneumatic conveying pipeline to connect the main equipment, and using a central air supply system to provide clean air for the pneumatic conveying pipeline, thereby ensuring the grading effect of the heavy calcium powder and ensuring the uniformity of the color of the heavy calcium powder.

[0006] The present invention provides a heavy calcium powder production system, which comprises a vertical mill, a dust collector, a first pneumatic conveying pipeline, a homogenizer, a second pneumatic conveying pipeline, a first classifier, a third pneumatic conveying pipeline, a second classifier and a first finished product warehouse connected in sequence; wherein the first pneumatic conveying pipeline, the second pneumatic conveying pipeline and the third pneumatic conveying pipeline are all supplied with air through a central air supply system;

[0007] The central air supply system includes an air compressor, a first air storage tank, a dust removal filter, an oil removal filter and an adsorption dryer which are connected in sequence, and the air outlet of the adsorption dryer is respectively connected to the first pneumatic conveying pipeline, the second pneumatic conveying pipeline and the third pneumatic conveying pipeline.

[0008] Specifically, the vertical mill is supplied with air by a blower, and an air inlet of the blower is connected to an air dehumidifier.

[0009] Specifically, the top of the homogenizer is provided with a first mixing feed port, a modified feed port and a first separation exhaust port, the first mixing feed port is connected to the discharge end of the first pneumatic conveying pipeline, the modified feed port is connected to a quantitative screw feeder, and the first separation exhaust port is connected to a first pulse dust collector;

[0010] The homogenizer is provided with a spiral ribbon stirring paddle inside, and the homogenizer is wrapped with a first temperature control jacket outside;

[0011] A homogenization discharge port is provided at the bottom of the homogenizer, and the homogenization discharge port is connected to the feed end of the second pneumatic conveying pipeline.

[0012] Specifically, a first raw material inlet and a first coarse powder outlet are provided at the lower end of the first classifier, the first raw material inlet is connected to the discharge end of the second pneumatic conveying pipeline, and the first coarse powder outlet is connected to the feed end of the third pneumatic conveying pipeline;

[0013] A first fine powder outlet is disposed at the upper end of the first classifier, and the first fine powder outlet is connected to a second finished product bin.

[0014] Specifically, a second mixing feed port and a second separation exhaust port are provided at the upper end of the second finished product bin, the second mixing feed port is connected to the first fine powder outlet through a first sealed pipeline, and the second separation exhaust port is connected to a second pulse dust collector;

[0015] A first finished product discharge port is provided at the lower end of the second finished product bin.

[0016] Specifically, the lower end of the second classifier is provided with a second raw material inlet and a second coarse powder outlet, the second raw material inlet is connected to the discharge end of the third pneumatic conveying pipeline, and the second coarse powder outlet is connected to a tailings tank;

[0017] A second fine powder outlet is disposed at the upper end of the second classifier, and the second fine powder outlet is connected to the first finished product bin.

[0018] Specifically, the upper end of the first finished product bin is provided with a third mixing feed port and a third separation exhaust port, the third mixing feed port is connected to the second fine powder outlet through a second sealed pipeline, and the third separation exhaust port is connected to a third pulse dust collector;

[0019] A second finished product discharge port is provided at the lower end of the first finished product bin.

[0020] Specifically, the central air supply system also includes a second air storage tank, the air inlet of the second air storage tank is connected to the air outlet of the adsorption dryer, and the air outlet of the second air storage tank is respectively connected to the first pneumatic conveying pipeline, the second pneumatic conveying pipeline and the third pneumatic conveying pipeline.

[0021] Specifically, the second gas storage tank is surrounded by a second temperature control jacket.

[0022] Specifically, the feed end of the first pneumatic conveying pipeline is provided with a first feed branch pipe and a first air inlet pipe opening, the first feed branch pipe is connected to the lower end discharge port of the dust collector, the first air inlet pipe opening is connected to the central air supply system, and the first air inlet pipe opening is provided with a first flow control valve;

[0023] The feed end of the second pneumatic conveying pipeline is provided with a second feed branch pipe and a second air inlet pipe opening, the second feed branch pipe is connected to the lower end discharge port of the homogenizer, the second air inlet pipe opening is connected to the central air supply system, and the second air inlet pipe opening is provided with a second flow control valve;

[0024] The feed end of the third pneumatic conveying pipeline is provided with a third feed branch pipe and a third air inlet pipe opening, the third feed branch pipe is connected to the lower end discharge port of the first classifier, the third air inlet pipe opening is connected to the central air supply system, and the third air inlet pipe opening is provided with a third flow control valve.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] In the heavy calcium powder production system of the present invention, the heavy calcium powder ground by the vertical mill is directly collected by the dust collector, and then the collected heavy calcium powder is transported to the homogenizer through the first pneumatic conveying pipeline for dispersion and homogenization, and then the homogenized heavy calcium powder is transported to the first classifier through the second pneumatic conveying pipeline for classification, and finally the coarse powder separated by the first classifier is transported to the second classifier through the third pneumatic conveying pipeline for secondary classification; wherein, a central air supply system is used to provide oil-free, water-free, dust-free clean compressed air for the first pneumatic conveying pipeline, the second pneumatic conveying pipeline and the third pneumatic conveying pipeline; the heavy calcium powder production system of the present invention can effectively reduce the phenomenon of heavy calcium powder agglomeration during operation, thereby ensuring the classification effect of the heavy calcium powder and ensuring the uniformity of the color of the heavy calcium powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 1 is a first structural schematic diagram of a heavy calcium powder production system according to an embodiment of the present invention;

[0029] Figure 22 is a schematic diagram of the second structure of the heavy calcium powder production system according to an embodiment of the present invention;

[0030] Figure 3 yes Figure 2 Schematic diagram of the enlarged structure of area A in the middle.

[0031] In the attached drawings, 100, vertical mill; 110, blower; 120, air dehumidifier; 200, dust collector; 210, silencer; 310, first pneumatic conveying pipeline; 311, first feed branch; 312, first air inlet; 313, first flow control valve; 400, homogenizer; 410, quantitative screw feeder; 420, first pulse dust collector; 430, spiral ribbon stirring paddle; 440, first temperature control jacket; 450, air duct check valve; 460, expansion pipeline; 470, first buffer tank; 320, second pneumatic conveying pipeline; 321, second feed branch; 322, second air inlet; 323, second flow control valve; 510, first classifier; 511, second buffer tank ; 330, the third pneumatic conveying pipeline; 331, the third feed branch pipe; 332, the third air inlet; 333, the third flow control valve; 520, the second classifier; 521, the tailings tank; 610, the first finished product bin; 611, the second sealed pipeline; 612, the third pulse dust collector; 613, the second streamlined guide body; 620, the second finished product bin; 621, the first sealed pipeline; 622, the second pulse dust collector; 623, the first streamlined guide body; 700, the central air supply system; 710, the air compressor; 720, the first air storage tank; 730, the dust removal filter; 740, the oil removal filter; 750, the adsorption dryer; 760, the second air storage tank; 761, the second temperature control jacket. DETAILED DESCRIPTION

[0032] 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.

[0033] The present invention provides a heavy calcium powder production system. Figure 1A first structural schematic diagram of a heavy calcium powder production system in an embodiment of the present invention is shown, wherein the heavy calcium powder production system includes a vertical mill 100, a dust collector 200, a first pneumatic conveying pipeline 310, a homogenizer 400, a second pneumatic conveying pipeline 320, a first classifier 510, a third pneumatic conveying pipeline 330, a second classifier 520 and a first finished product warehouse 610, which are connected in sequence; wherein the first pneumatic conveying pipeline 310, the second pneumatic conveying pipeline 320 and the third pneumatic conveying pipeline 330 are all supplied with air through a central air supply system 700; the central air supply system 700 includes an air compressor 710, a first air storage tank 720, a dust removal filter 730, an oil removal filter 740 and an adsorption dryer 750, which are connected in sequence, and an air outlet of the adsorption dryer 750 is respectively connected to the first pneumatic conveying pipeline 310, the second pneumatic conveying pipeline 320 and the third pneumatic conveying pipeline 330.

[0034] In the heavy calcium powder production system of the present invention, the heavy calcium powder ground by the vertical mill 100 is directly collected by the dust collector 200, and then the collected heavy calcium powder is transported to the homogenizer 400 through the first pneumatic conveying pipeline 310 for dispersion and homogenization, and then the homogenized heavy calcium powder is transported to the first classifier 510 through the second pneumatic conveying pipeline 320 for classification, and finally the coarse powder separated by the first classifier 510 is transported to the second classifier 520 through the third pneumatic conveying pipeline 330 for secondary classification; wherein, the central air supply system 700 is used to provide oil-free, water-free and dust-free clean compressed air for the first pneumatic conveying pipeline 310, the second pneumatic conveying pipeline 320 and the third pneumatic conveying pipeline 330.

[0035] In some specific embodiments, the diameter of the grinding roller of the vertical mill 100 is D1, the material layer thickness of the vertical mill 100 when working is H1, and the constraint relationship between D1 and H1 is: H1=2%D1±20mm. Appropriate material layer thickness is conducive to the stable operation of the vertical mill 100; if the material layer is too thick, it is easy to increase the load of the vertical mill 100; if the material layer is too thin, it is easy to aggravate the vibration of the vertical mill 100.

[0036] Specifically, when the vertical mill 100 is working, the feeding amount of the vertical mill 100 is controlled to be 172-218 t / h, the feeding particle size of the vertical mill 100 is controlled to be 1%D1-3.6%D1, and the working wind speed of the vertical mill 100 is controlled to be 50-70 m / s, which is beneficial to maintaining the stability of the material layer and can form a good internal circulation that is beneficial to the classification of heavy calcium powder.

[0037] In some specific embodiments, the pressure range of the compressed air produced by the air compressor 710 is 40-60 MPa, which can easily meet the transportation requirements of various pneumatic conveying pipelines.

[0038] In some specific embodiments, the filtering accuracy of the dust removal filter 730 is 1 μm, which can intercept and remove dust, water droplets, etc. in the compressed air; the filtering accuracy of the oil removal filter 740 is 0.1 μm, which can intercept and remove oil mist particles, etc. in the compressed air; the dust removal filter 730 and the oil removal filter 740 jointly play a filtering role, which can effectively remove dust and oil in the compressed air, which is beneficial to improve the cleanliness of the compressed air.

[0039] The heavy calcium powder production system of the present invention can effectively reduce the phenomenon of heavy calcium powder agglomeration by arranging a homogenizer 400 between the grinding system and the grading system, and using a pneumatic conveying pipeline to connect the main equipment, and using a central air supply system 700 to provide clean air for the pneumatic conveying pipeline, thereby ensuring the grading effect of the heavy calcium powder and ensuring the uniformity of the color of the heavy calcium powder; moreover, the particles of the heavy calcium powder obtained after the secondary classification are uniform and the size is basically the same.

[0040] Figure 2 A second structural schematic diagram of the heavy calcium powder production system in an embodiment of the present invention is shown.

[0041] In some specific embodiments, see Figure 2 The exhaust port of the dust collector 200 is connected to a muffler 210 , and the muffler 210 can effectively reduce the exhaust noise of the dust collector 200 .

[0042] In some specific embodiments, see Figure 1 The vertical mill 100 is supplied with air by a blower 110; for details, please refer to Figure 2 The air inlet of the blower 110 is connected to an air dehumidifier 120, which can effectively reduce the moisture in the air, which is beneficial to improving the dryness of the air supplied by the blower 110 to the vertical mill 100, thereby reducing the chance of the heavy calcium powder contacting moisture and further reducing the probability of heavy calcium powder agglomeration.

[0043] In some specific embodiments, see Figure 2The top of the homogenizer 400 is provided with a first mixing feed port, a modified feed port and a first separation exhaust port. The first mixing feed port is connected to the discharge end of the first pneumatic conveying pipe 310, and the airflow carries the heavy calcium powder into the homogenizer 400 from the first mixing feed port; the modified feed port is connected to a quantitative screw feeder 410, and the quantitative screw feeder 410 can quantitatively add a modification aid to the homogenizer 400 to achieve the modification of the heavy calcium powder, so that the heavy calcium powder has better dispersibility and is convenient for subsequent classification; the first separation exhaust port is connected to a first pulse dust collector 420, and the airflow carries the heavy calcium powder into the homogenizer After the homogenizer 400, the gas and powder are separated by the first pulse dust collector 420; the interior of the homogenizer 400 is provided with a spiral belt stirring paddle 430, which can stir the heavy calcium powder at a high speed and has a good homogenization effect; the exterior of the homogenizer 400 is wrapped with a first temperature control jacket 440, and the temperature of the homogenizer 400 can be adjusted as required, so as to facilitate the homogenization and modification of the heavy calcium powder; the bottom of the homogenizer 400 is provided with a homogenization discharge port, and the homogenization discharge port is connected to the feed end of the second pneumatic conveying pipeline 320, and the homogenized heavy calcium powder can be discharged from the homogenization discharge port and enter the second pneumatic conveying pipeline 320.

[0044] Figure 3 Shows Figure 2 In the enlarged structural diagram of the A area, the first mixing feed port is provided with an air duct check valve 450, which is used to prevent the heavy calcium powder from flowing back from the homogenizer 400 into the first pneumatic conveying pipeline 310 during the homogenization process, thereby ensuring the stability of the homogenization process.

[0045] For further information, see Figure 3 The air duct check valve 450 and the first mixing feed port are connected via an expansion pipe 460, and the diameter of the expansion pipe 460 gradually increases in the direction approaching the first mixing feed port, which is beneficial to reduce the flow rate of the air flow and facilitate the separation of heavy calcium powder from the air flow.

[0046] In some specific embodiments, the filling volume fraction of the homogenizer 400 is 20% to 70%, and the rotation speed range of the spiral impeller 430 of the homogenizer 400 is controlled to be 100 to 200 r / min. On the one hand, it can effectively homogenize the heavy calcium powder, reduce the agglomeration of the heavy calcium powder, and ensure the uniformity of the color of the heavy calcium powder; on the other hand, it is conducive to adding modified additives according to needs to mix and modify the heavy calcium powder, thereby enhancing the dispersibility of the heavy calcium powder.

[0047] Specifically, the temperature range of the first temperature control jacket 440 is controlled at 60°C to 90°C, which is beneficial to drying the heavy calcium powder on the one hand, reducing the risk of heavy calcium powder agglomeration, and making the homogenization effect of the heavy calcium powder better; on the other hand, it is beneficial to promote the mixed modification of the heavy calcium powder and the modification aid, and improve the modification efficiency of the heavy calcium powder.

[0048] Furthermore, the feeding speed range of the quantitative screw feeder 410 is 30kg / h to 8t / h, and the feeding amount of the modification aid can be adjusted in time according to the modification progress of the heavy calcium powder to ensure sufficient reaction between the heavy calcium powder and the modification aid, and at the same time help to avoid excessive modification.

[0049] In some specific embodiments, the diameter of the end of the expansion pipe 460 connected to the air duct check valve 450 is D2, the diameter of the end of the expansion pipe 460 connected to the first mixed feed port is D3, and the constraint relationship between D2 and D3 is: 1.5D2≤D3; the length of the expansion pipe 460 is at least 2.6D2. When the airflow carrying the heavy calcium powder enters the expansion pipe 460, it can be effectively decelerated, so that most of the heavy calcium powder is automatically separated from the airflow under the action of gravity.

[0050] For further information, see Figure 2 The axis of the expansion pipe 460 intersects with the axis of the spiral agitator 430 to form a first angle, and the angle range of the first angle is 45° to 65°, which is conducive to the airflow carrying the heavy calcium powder to impact the spiral agitator 430 from top to bottom, thereby promoting the separation of the heavy calcium powder and the airflow.

[0051] In some specific embodiments, see Figure 2 The homogenization discharge port is connected to the feed end of the second pneumatic conveying pipeline 320 through the first buffer tank 470. The first buffer tank 470 can temporarily store the homogenized heavy calcium powder, which is conducive to the heavy calcium powder being evenly conveyed to the second pneumatic conveying pipeline 320.

[0052] In some specific embodiments, see Figure 2 The first classifier 510 has a first raw material inlet and a first coarse powder outlet at its lower end, the first raw material inlet is connected to the discharge end of the second pneumatic conveying pipeline 320, and the first coarse powder outlet is connected to the feed end of the third pneumatic conveying pipeline 330; the first classifier 510 has a first fine powder outlet at its upper end, and the first fine powder outlet is connected to the second finished product bin 620. The first classifier 510 first separates the fine powder from the heavy calcium powder and sends it to the finished product bin; the coarse powder flows into the second classifier 520.

[0053] For details, please refer to Figure 2The upper end of the second finished product bin 620 is provided with a second mixing feed port and a second separation exhaust port, and the second mixing feed port is connected to the first fine powder outlet through a first sealed pipe 621, and the airflow entrains the fine heavy calcium powder into the second finished product bin 620 from the second mixing feed port; the second separation exhaust port is connected to a second pulse dust collector 622, and after the airflow entrains the fine heavy calcium powder into the second finished product bin 620, the gas and powder are separated by the second pulse dust collector 622; the lower end of the second finished product bin 620 is provided with a first finished product discharge port, and the fine heavy calcium powder can be discharged from the first finished product discharge port.

[0054] For further information, see Figure 2 A first streamlined flow guide 623 is set up inside the second finished product bin 620. The first streamlined flow guide 623 is located at the lower part of the second finished product bin 620. The upper end of the first streamlined flow guide 623 is a hemispherical structure. The diameter of the first streamlined flow guide 623 gradually decreases from top to bottom. The first streamlined flow guide 623 can effectively guide the flow of heavy calcium powder. At the same time, the first streamlined flow guide 623 is helpful to prevent the heavy calcium powder separated by the second pulse dust collector 622 from directly impacting the first finished product discharge port.

[0055] In some specific embodiments, see Figure 2 The first coarse powder outlet is connected to the feed end of the third pneumatic conveying pipeline 330 through the second buffer tank 511. The second buffer tank 511 can temporarily store the coarse powder after the first classification, which is conducive to the coarse powder after the first classification being evenly conveyed to the third pneumatic conveying pipeline 330.

[0056] In some specific embodiments, see Figure 2 The lower end of the second classifier 520 is provided with a second raw material inlet and a second coarse powder outlet, the second raw material inlet is connected to the discharge end of the third pneumatic conveying pipeline 330, and the second coarse powder outlet is connected to the tailing tank 521; the upper end of the second classifier 520 is provided with a second fine powder outlet, and the second fine powder outlet is connected to the first finished product bin 610. The second classifier 520 is used to perform secondary classification on the coarse heavy calcium powder, and the fine powder that meets the requirements is discharged from the second fine powder outlet and enters the first finished product bin 610; the coarse particles that do not meet the requirements are discharged from the second coarse powder outlet and enter the tailing tank 521.

[0057] For details, please refer to Figure 2The upper end of the first finished product bin 610 is provided with a third mixing feed port and a third separation exhaust port, and the third mixing feed port is connected to the second fine powder outlet through a second sealed pipe 611, and the airflow carries the fine heavy calcium powder after secondary classification into the first finished product bin 610 from the third mixing feed port; the third separation exhaust port is connected to the third pulse dust collector 612, and after the airflow carries the fine heavy calcium powder after secondary classification into the first finished product bin 610, the gas and powder are separated by the third pulse dust collector 612; the lower end of the first finished product bin 610 is provided with a second finished product discharge port, and the fine heavy calcium powder after secondary classification can be discharged from the second finished product discharge port.

[0058] For further information, see Figure 2 A second streamlined flow guide 613 is set up inside the first finished product bin 610. The second streamlined flow guide 613 is located at the lower part of the first finished product bin 610. The upper end of the second streamlined flow guide 613 is a hemispherical structure. The diameter of the second streamlined flow guide 613 gradually decreases from top to bottom. The second streamlined flow guide 613 can effectively guide the flow of heavy calcium powder. At the same time, the second streamlined flow guide 613 is beneficial to prevent the heavy calcium powder separated by the third pulse dust collector 612 from directly impacting the second finished product discharge port.

[0059] In some specific embodiments, see Figure 2 The central air supply system 700 further includes a second air storage tank 760, the air inlet of the second air storage tank 760 is connected to the air outlet of the adsorption dryer 750, and the air outlet of the second air storage tank 760 is respectively connected to the first pneumatic conveying pipeline 310, the second pneumatic conveying pipeline 320 and the third pneumatic conveying pipeline 330. The second air storage tank 760 is used to store purified compressed air, which can provide a stable clean air source when needed, and can alleviate the problem of uneven delivery caused by air source fluctuations.

[0060] For details, please refer to Figure 2 The second gas storage tank 760 is surrounded by a second temperature control jacket 761, which can adjust the temperature of the gas in the second gas storage tank 760, ensuring that the conveying gas is kept within a suitable temperature range. On the one hand, it can ensure the stability and dryness of the gas during the conveying process, and on the other hand, it can adjust the temperature of the heavy calcium powder. Usually, the temperature range of the second gas storage tank 760 is controlled to be 30℃~50℃, which can keep the heavy calcium powder in a loose state and maintain good fluidity, which is conducive to the smooth completion of the production process of the heavy calcium powder production system.

[0061] In some specific embodiments, see Figure 1The feed end of the first pneumatic conveying pipeline 310 is provided with a first feed branch pipe 311 and a first air inlet pipe port 312, the first feed branch pipe 311 is connected to the lower end outlet of the dust collector 200, the first air inlet pipe port 312 is connected to the central air supply system 700, and the first air inlet pipe port 312 is provided with a first flow control valve 313; the feed end of the second pneumatic conveying pipeline 320 is provided with a second feed branch pipe 321 and a second air inlet pipe port 322, the second feed branch pipe 321 and the homogenizer 400 The lower end outlet of the first classifier 510 is connected, the second air inlet port 322 is connected to the central air supply system 700, and the second air inlet port 322 is provided with a second flow control valve 323; the feeding end of the third pneumatic conveying pipeline 330 is provided with a third feeding branch pipe 331 and a third air inlet port 332, the third feeding branch pipe 331 is connected to the lower end outlet of the first classifier 510, the third air inlet port 332 is connected to the central air supply system 700, and the third air inlet port 332 is provided with a third flow control valve 333. The air inlet ports of each pneumatic conveying pipeline are provided with a flow control valve, which can adjust the air flow through the pneumatic conveying pipeline to achieve precise control of the conveying speed and amount of heavy calcium powder, and ensure the stability of the heavy calcium powder flow rate during pneumatic conveying and the efficiency of system operation.

[0062] Specifically, the conveying air flow velocity of the first pneumatic conveying pipeline 310 is in the range of 20-40 m / s, with high conveying speed and large conveying volume, so that the heavy calcium powder can quickly fill the homogenizer 400; the conveying air flow velocity of the second pneumatic conveying pipeline 320 is in the range of 4-12 m / s, and the conveying is gentle and efficient, avoiding affecting the operation of the first classifier 510; the conveying air flow velocity of the third pneumatic conveying pipeline 330 is in the range of 4-12 m / s, and the conveying is gentle and efficient, avoiding affecting the operation of the second classifier 520. If the conveying air flow velocity is too high, it will aggravate the wear of the pipe fittings, increase the power consumption, affect the separation of gas and solid, etc.; if the conveying air flow velocity is too low, it is easy to cause material falling and pipeline blockage, affecting continuous production; therefore, each pneumatic conveying pipeline adopts a suitable conveying air flow velocity, which is not only conducive to reducing the operating cost of the heavy calcium powder production system, but also conducive to ensuring the operating stability of the heavy calcium powder production system.

[0063] The working process of the heavy calcium powder production system of the present invention is:

[0064] First, the vertical mill 100 grinds the ore into heavy calcium powder, which usually contains 50% of powder with a particle size of 2μm; secondly, the dust collector 200 separates the heavy calcium powder ground by the vertical mill 100 from the airflow; then, the heavy calcium powder collected by the dust collector 200 is conveyed to the homogenizer 400 through the first pneumatic conveying pipeline 310 for dispersion and homogenization to ensure the uniformity of the color of the heavy calcium powder. At this time, a modified additive can be quantitatively added to the homogenizer 400 through the quantitative screw feeder 410 according to demand to modify the heavy calcium powder and enhance the dispersibility of the heavy calcium powder; then Then, the homogenized heavy calcium powder is transported to the first classifier 510 through the second pneumatic conveying pipeline 320 for classification, the fine powder of the first classification (powder with a particle size of 2 μm usually accounts for 80%) enters the second finished product warehouse 620, and the coarse powder of the first classification (particles of different sizes) is transported to the second classifier 520 through the third pneumatic conveying pipeline 330 for secondary classification; finally, the fine powder of the second classification (with good uniformity of particle size) enters the first finished product warehouse 610, and the coarse powder of the second classification (with more impurities and coarse particles, usually discarded) enters the tailing tank 521. Among them, the central air supply system 700 is used to provide oil-free, water-free, and dust-free clean compressed air for the first pneumatic conveying pipeline 310, the second pneumatic conveying pipeline 320, and the third pneumatic conveying pipeline 330.

[0065] The heavy calcium powder production system of the present invention can effectively reduce the phenomenon of heavy calcium powder agglomeration by arranging a homogenizer 400 between the grinding system and the grading system, and using a pneumatic conveying pipeline to connect the main equipment, and using a central air supply system 700 to provide clean air for the pneumatic conveying pipeline, thereby ensuring the grading effect of the heavy calcium powder and ensuring the uniformity of the color of the heavy calcium powder; moreover, the particles of the heavy calcium powder obtained after the secondary classification are uniform and the size is basically the same; in addition, the heavy calcium powder production system of the present invention has good operating efficiency and high production continuity.

[0066] The above is a detailed introduction to a heavy calcium powder production system provided by an embodiment of the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for general technical personnel in the field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A heavy calcium powder production system, characterized in that: The heavy calcium powder production system comprises a vertical mill, a dust collector, a first pneumatic conveying pipeline, a homogenizer, a second pneumatic conveying pipeline, a first classifier, a third pneumatic conveying pipeline, a second classifier and a first finished product warehouse connected in sequence; wherein the first pneumatic conveying pipeline, the second pneumatic conveying pipeline and the third pneumatic conveying pipeline are all supplied with air through a central air supply system; The central air supply system includes an air compressor, a first air storage tank, a dust removal filter, an oil removal filter and an adsorption dryer which are connected in sequence, and the air outlet of the adsorption dryer is respectively connected to the first pneumatic conveying pipeline, the second pneumatic conveying pipeline and the third pneumatic conveying pipeline.

2. The heavy calcium powder production system according to claim 1, characterized in that: The vertical mill is supplied with air by a blower, and an air inlet of the blower is connected to an air dehumidifier.

3. The heavy calcium powder production system according to claim 1, characterized in that: The top of the homogenizer is provided with a first mixing feed port, a modified feed port and a first separation exhaust port, the first mixing feed port is connected to the discharge end of the first pneumatic conveying pipeline, the modified feed port is connected to a quantitative screw feeder, and the first separation exhaust port is connected to a first pulse dust collector; The homogenizer is provided with a spiral ribbon stirring paddle inside, and the homogenizer is wrapped with a first temperature control jacket outside; A homogenization discharge port is provided at the bottom of the homogenizer, and the homogenization discharge port is connected to the feed end of the second pneumatic conveying pipeline.

4. The heavy calcium powder production system according to claim 1, characterized in that: The lower end of the first classifier is provided with a first raw material inlet and a first coarse powder outlet, the first raw material inlet is connected to the discharge end of the second pneumatic conveying pipeline, and the first coarse powder outlet is connected to the feed end of the third pneumatic conveying pipeline; A first fine powder outlet is disposed at the upper end of the first classifier, and the first fine powder outlet is connected to a second finished product bin.

5. The heavy calcium powder production system according to claim 4, characterized in that: The upper end of the second finished product bin is provided with a second mixing feed port and a second separation exhaust port, the second mixing feed port is connected to the first fine powder outlet through a first sealed pipeline, and the second separation exhaust port is connected to a second pulse dust collector; A first finished product discharge port is provided at the lower end of the second finished product bin.

6. The heavy calcium powder production system according to claim 1, characterized in that: The lower end of the second classifier is provided with a second raw material inlet and a second coarse powder outlet, the second raw material inlet is connected to the discharge end of the third pneumatic conveying pipeline, and the second coarse powder outlet is connected to a tailings tank; A second fine powder outlet is disposed at the upper end of the second classifier, and the second fine powder outlet is connected to the first finished product bin.

7. The heavy calcium powder production system according to claim 6, characterized in that: A third mixing feed port and a third separation exhaust port are provided at the upper end of the first finished product bin, the third mixing feed port is connected to the second fine powder outlet via a second sealed pipeline, and the third separation exhaust port is connected to a third pulse dust collector; A second finished product discharge port is provided at the lower end of the first finished product bin.

8. The heavy calcium powder production system according to claim 1, characterized in that: The central air supply system also includes a second air storage tank, the air inlet of the second air storage tank is connected to the air outlet of the adsorption dryer, and the air outlet of the second air storage tank is respectively connected to the first pneumatic conveying pipeline, the second pneumatic conveying pipeline and the third pneumatic conveying pipeline.

9. The heavy calcium powder production system according to claim 8, characterized in that: The second gas storage tank is surrounded by a second temperature control jacket.

10. The heavy calcium powder production system according to claim 1, characterized in that: The feed end of the first pneumatic conveying pipeline is provided with a first feed branch pipe and a first air inlet pipe opening, the first feed branch pipe is connected to the lower end discharge port of the dust collector, the first air inlet pipe opening is connected to the central air supply system, and the first air inlet pipe opening is provided with a first flow control valve; The feed end of the second pneumatic conveying pipeline is provided with a second feed branch pipe and a second air inlet pipe opening, the second feed branch pipe is connected to the lower end discharge port of the homogenizer, the second air inlet pipe opening is connected to the central air supply system, and the second air inlet pipe opening is provided with a second flow control valve; The feed end of the third pneumatic conveying pipeline is provided with a third feed branch pipe and a third air inlet pipe opening, the third feed branch pipe is connected to the lower end discharge port of the first classifier, the third air inlet pipe opening is connected to the central air supply system, and the third air inlet pipe opening is provided with a third flow control valve.

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