Ultrafine grinding process and equipment for coal gangue

Abstract

This invention belongs to the field of coal gangue grinding, and relates to a process and equipment for ultrafine powder grinding of coal gangue, which can achieve efficient grinding of ultrafine coal gangue powder. The technical solution includes: a support frame, a roller, a spiral feed pipe, a gas flow mill tube, an air compressor, and a cyclone separator. The support frame is fixed to the ground. The roller is connected to the support frame via bearings. The spiral feed pipe is a cylindrical tube, with one end extending into the roller, and the spiral feed pipe and roller share the same centerline, communicating with each other. A gas flow mill tube is installed inside the roller, communicating with the inside of the roller, and both ends of the gas flow mill tube are fixedly connected to the support frame. The air compressor is fixed to the outside of the roller and communicates with the gas flow mill tube. The cyclone separator is a cylindrical tube, with one end communicating with the gas flow mill tube, and the cyclone separator extending from inside the roller to the outside, with a discharge port on the outside side.

Description

Technical Field

[0001] This invention belongs to the field of coal gangue grinding, and relates to an ultrafine powder grinding process and grinding equipment for coal gangue. Background Technology

[0002] Coal gangue is a large amount of solid waste generated in the coal mining and washing industries. Previously, coal gangue was piled up in the open or buried in large quantities. Therefore, the coal mining and washing industries had to pay some fees for coal gangue disposal. Moreover, after coal gangue accumulates, rainwater seepage may also cause pollution to the surrounding land and groundwater.

[0003] In recent years, coal gangue has been extensively developed and utilized. Among them, coal gangue can be ground into fine powder to replace cement, but the cost-effectiveness is relatively low, and enterprises are not enthusiastic about reusing coal gangue.

[0004] Further grinding coal gangue into ultrafine powder can be used as an adsorbent, ceramic raw material, or in coal gas production, and has high added economic value.

[0005] Currently, ball mills are commonly used for ultrafine grinding of coal gangue. The particle size of ultrafine coal gangue powder ranges from 30μm to 200μm, while the output particle size of continuous ball mills ranges from 50μm to 1000μm. Among these, the grinding efficiency is highest for materials with a particle size of 200μm or larger. As grinding progresses, the particle size of coal gangue continuously decreases, and the grinding efficiency also decreases accordingly, resulting in an overall increase in the energy consumption of ball mills. Summary of the Invention

[0006] To overcome the shortcomings of the aforementioned related technologies, this invention proposes an ultrafine grinding equipment for coal gangue, which can achieve efficient grinding of ultrafine coal gangue powder.

[0007] To achieve the above-mentioned technical objectives, the present invention provides an ultrafine grinding device for coal gangue. The ultrafine grinding device for coal gangue includes: a support frame, a roller, a spiral feed pipe, a gas flow mill tube, an air compressor, and a cyclone separator. The support frame is fixed to the ground. The roller is connected to the support frame via bearings. The spiral feed pipe is a cylindrical tube, with one end extending into the roller, and the spiral feed pipe and the roller sharing a common centerline, communicating with each other. A gas flow mill tube is disposed inside the roller, communicating with the interior of the roller, and both ends of the gas flow mill tube are fixedly connected to the support frame. The air compressor is fixed to the outside of the roller and communicates with the gas flow mill tube. The cyclone separator is a cylindrical tube, with one end communicating with the gas flow mill tube, and the cyclone separator tube extends from inside the roller to the outside, with a discharge port located on the outside side of the cyclone separator tube.

[0008] Preferably, the gas flow mill tube includes a main flow mill tube and a suction pipe. The main flow mill tube is a cylindrical tube, one end of which is fixedly connected to the spiral feed pipe, and the other end of which is fixedly connected to the cyclone separator. Multiple high-pressure nozzles are provided on the main flow mill tube. The suction pipe is fixed to the main flow mill tube and communicates with the air compressor. The suction pipe is also connected to the end of the main flow mill tube near the spiral feed pipe. The suction pipe is configured to absorb materials with a particle size less than or equal to 2 mm inside the roller.

[0009] Preferably, the ultrafine grinding equipment for coal gangue further includes a pressure sensor. The support includes an upper support and a lower support, the lower support is fixed to the ground, the upper support is mounted on the lower support, and a pressure sensor is fixed between the upper and lower supports. The roller is connected to the upper support, and the pressure sensor is used to measure the total mass of the roller and all its contents.

[0010] Preferably, the suction tube is made of wear-resistant rubber. The gas flow mill tube further includes: a suction bracket, a stepper motor, an electric push rod, and a suction shell. Two suction brackets are fixed to both ends of the main flow mill tube, one for each other. Each suction bracket has a stepper motor fixed on it. Each suction bracket is connected to the housing of an electric push rod via a bearing, and the housing of the electric push rod is also fixedly connected to the output shaft of the stepper motor. The suction shell is elongated and hollow inside. A suction slit is provided on the side wall of the suction shell along its extension direction, connecting the interior of the suction shell to the inside of the roller. Two electric push rods are fixedly connected to both ends of the suction shell, one for each other, and multiple suction tubes communicate with the interior of the suction shell.

[0011] Preferably, the ultrafine grinding equipment for coal gangue further includes a controller, which is electrically connected to the stepper motor, electric push rod, air compressor and pressure sensor respectively.

[0012] Preferably, the cyclone separator comprises: a separator, a helical blade, and a discharge pipe. The separator is a cylindrical tube with a discharge port on one end of its sidewall. The separator shares a centerline with the main flow mill pipe, and the other end of the separator is connected to the main flow mill pipe. The helical blade is fixed to the separator near the main flow mill pipe. The discharge pipe is a cylindrical tube open at both ends, sharing a centerline with the separator, and extending from inside the separator to the outside of the roller. The other end of the discharge pipe is a discharge port.

[0013] Preferably, an external gear is coaxially fixed on the outer wall of the roller. The ultrafine grinding equipment for coal gangue also includes a drive motor, a reducer, and a drive gear. The drive motor is connected to the reducer, the output shaft of the reducer is coaxially fixedly connected to the drive gear, and the drive gear meshes with the external gear.

[0014] On the other hand, the present invention also provides an ultrafine grinding process for coal gangue, applicable to the aforementioned ultrafine grinding equipment for coal gangue. The ultrafine grinding process for coal gangue includes: selecting coal gangue powder with a particle size of 10mm~20mm; adding the coal gangue powder and grinding media into a roller, and driving the roller to rotate, thereby initially grinding the coal gangue powder into fine coal gangue powder with a particle size less than 10mm; drawing coal gangue particles with a particle size less than or equal to 2mm from the fine coal gangue powder into the main flow mill; and injecting a high-pressure airflow into the main flow mill, causing the coal gangue particles to move at high speed and collide within the gas turbulence, thereby achieving further grinding of the coal gangue particles, and discharging coal gangue particles with a particle size less than or equal to 100μm as ultrafine coal gangue powder. Coal gangue particles with a diameter greater than 100μm are returned to the rollers for further grinding.

[0015] Preferably, before drawing coal gangue particles with a particle size of less than or equal to 2 mm into the main flow mill, the ultrafine grinding process of the coal gangue further includes: obtaining the sum of the masses of the coal gangue powder, milling media, and fine coal gangue powder within the roller. Based on the sum of the masses of the coal gangue powder, milling media, and fine coal gangue powder, a distribution map of the coal gangue powder, milling media, and fine coal gangue powder within the roller is formed, and the fine coal gangue powder is drawn from the top of the mixture of the coal gangue powder, milling media, and fine coal gangue powder.

[0016] Preferably, the method for drawing the fine coal gangue powder from the top of the mixture of coal gangue powder, ball milling media and fine coal gangue powder includes: absorbing coal gangue powder with a mass of less than 5 mg into the main flow mill through an airflow.

[0017] The beneficial effects of this invention are as follows:

[0018] This invention employs a gas flow mill tube, which can adsorb small-diameter coal gangue particles inside the roller and transfer them into the gas flow mill tube. This avoids further grinding of the small-diameter coal gangue particles inside the roller, while the air flow mill continues to grind the small-diameter coal gangue particles inside the gas flow mill tube. This allows for the balance of grinding efficiency between ball milling and air flow milling processes based on the coal gangue particle size, thereby improving the overall grinding efficiency of ultrafine coal gangue powder, reducing energy consumption, and enhancing product competitiveness. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a structural diagram of the present invention;

[0021] Figure 2 This is an internal sectional view of the present invention;

[0022] Figure 3 This is a cross-sectional view of the gas flow mill tube of the present invention;

[0023] Figure 4 This is a partial structural diagram of the gas flow grinding tube of the present invention;

[0024] Figure 5 This is a cross-sectional view of the suction shell of the present invention.

[0025] In the diagram: 1. Support; 2. Roller; 3. Spiral feed pipe; 4. Gas flow mill pipe; 5. Air compressor; 6. Swirl separator pipe; 9. Pressure sensor; 10. Air inlet pipe; 41. Flow mill main pipe; 42. Suction pipe; 43. Suction support; 44. Stepper motor; 45. Electric push rod; 46. Suction shell; 47. Negative pressure suction pipe; 48. Negative pressure control board; 49. Protrusion; 61. Separation pipe; 62. Spiral blade; 63. Discharge pipe. Detailed Implementation

[0026] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0028] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0029] On the one hand, such as Figures 1 to 5 As shown, some embodiments of the present invention provide an ultrafine grinding device for coal gangue. The ultrafine grinding device for coal gangue includes: a support 1, a roller 2, a spiral feed pipe 3, a gas flow mill pipe 4, an air compressor 5, and a cyclone separator 6. The support 1 is fixed to the ground. The roller 2 is connected to the support 1 via bearings. The spiral feed pipe 3 is a cylindrical tube, with one end extending into the roller 2, and the spiral feed pipe 3 and the roller 2 sharing a common centerline, communicating with each other. A gas flow mill pipe 4 is disposed inside the roller 2, communicating with the interior of the roller 2, and both ends of the gas flow mill pipe 4 are fixedly connected to the support 1. The air compressor 5 is fixed to the outside of the roller 2, and the air compressor 5 is connected to the gas flow mill pipe 4. The cyclone separator 6 is a cylindrical tube. One end of the cyclone separator 6 is connected to the gas flow mill tube 4, and the cyclone separator 6 extends from inside the roller 2 to the outside. The cyclone separator 6 located on the outside is provided with a discharge port.

[0030] An external gear is coaxially fixed on the outer wall of the roller 2. The ultrafine grinding equipment for coal gangue also includes a drive motor, a reducer, and a drive gear. The drive motor is connected to the reducer, the output shaft of the reducer is coaxially fixedly connected to the drive gear, and the drive gear meshes with the external gear.

[0031] In this application, the roller 2 can be a cylindrical body with openings at both ends. A support is provided at each end of the roller 2, and a bearing is provided on the inner side of each end of the roller. The roller is fixedly connected to the outer ring of the bearing. An external gear is coaxially fixedly connected to the outer wall of the roller, allowing the roller to rotate around its center line under the action of a drive motor.

[0032] One end of the spiral feed pipe 3 is connected to the feeding mechanism, and the other end extends into the inside of the roller. A discharge port is provided on the side wall of the spiral feed pipe inside the roller, and the spiral feed pipe 3 located on the outside of the roller is fixedly connected to the support. A spiral blade rod is provided inside the spiral feed pipe 3. The spiral feed pipe 3 is used to feed material into the roller 2. In this application, 10mm~20mm coal gangue powder can be added to the roller 2, and ball milling media can be added simultaneously. The particle size of the ball milling media can be 30mm~40mm.

[0033] This application also includes an air inlet pipe 10, which is a pipe body closed at both ends and coaxially fitted onto the outside of the spiral feed pipe 3. The air inlet pipe 10 extends into the roller 2, and the air inlet pipe 10 located inside the roller 2 is fixedly connected to the inner ring of the bearing. The air inlet pipe 10 located inside the roller 2 is provided with an opening that matches the discharge port, so that the material can enter the roller 2 from the spiral feed pipe 3. The air inlet pipe 10 located outside the roller 2 is connected to the air compressor 5, and the air inlet pipe 10 is also connected to the gas flow mill pipe 4.

[0034] The gas flow mill tube 4 is connected to the cyclone separator tube 6.

[0035] During operation, coal gangue powder enters the roller 2 through the spiral feed pipe 3. The roller 2 is also filled with ball milling media. As the roller 2 rotates, the ball milling media and the coal gangue powder complete the ball milling process. After ball milling, the coal gangue powder in the roller 2 is converted into small-particle coal gangue powder. Further ball milling of the small-particle coal gangue powder leads to reduced efficiency and increased energy consumption.

[0036] Small-diameter coal gangue powder is absorbed from roller 2 into gas flow mill tube 4, where it is then ground using an air flow mill.

[0037] After passing through the air jet mill, the small-diameter coal gangue powder is then passed through the cyclone separator 6. The coal gangue powder with a particle size greater than 100μm can be sorted out and discharged into the roller for ball milling again. The coal gangue powder with a particle size less than or equal to 100μm is discharged as coal gangue ultrafine powder.

[0038] In some embodiments, the gas flow mill tube 4 includes a main flow mill tube 41 and a suction tube 42. The main flow mill tube 41 is a cylindrical tube, one end of which is fixedly connected to the spiral feed tube 3, and the other end of which is fixedly connected to the cyclone separator tube 6. Multiple high-pressure nozzles are provided on the main flow mill tube 41. The suction tube 42 is fixed to the main flow mill tube 41 and is connected to the air compressor 5. The suction tube 42 is also connected to the end of the main flow mill tube 41 near the spiral feed tube 3. The suction tube 42 is configured to absorb materials with a particle size less than or equal to 2 mm inside the roller 2.

[0039] The main flow mill pipe 41 is a cylindrical tube with an internal wear-resistant layer. The main flow mill pipe 41 can be coaxially fixed with the spiral feed pipe 3. Multiple high-pressure nozzles are arranged in a row on the outer wall of the main flow mill pipe 41. These high-pressure nozzles can be connected to the air inlet pipe 10 via multiple venting steel pipes. Specifically, the venting steel pipes are straight rods, arranged parallel to one side of the main flow mill pipe 41, with one end connected to the air inlet pipe 10 and the other end closed. These multiple venting steel pipes are arranged circumferentially on the outer side of the main flow mill pipe and are parallel to it. Each venting steel pipe is connected to several corresponding high-pressure nozzles.

[0040] The suction pipe 42 is also connected to the air compressor 5, which draws small-diameter coal gangue powder from the roller into the main flow mill pipe 41 through negative pressure. Specifically, small-diameter coal gangue powder refers to coal gangue powder with a particle size of less than or equal to 2 mm. Under the action of high-pressure airflow ejected from the high-pressure nozzle, turbulence is formed, causing the coal gangue powder to collide with each other, thus realizing airflow milling.

[0041] The suction pipe 42 is made of wear-resistant rubber. The gas flow mill pipe 4 also includes: a suction bracket 43, a stepper motor 44, an electric push rod 45, and a suction shell 46. Two suction brackets 43 are fixed to the two ends of the flow mill main pipe 41 in a one-to-one correspondence. Each suction bracket 43 is fixed with a stepper motor 44. Each suction bracket 43 is connected to the housing of an electric push rod 45 through a bearing, and the housing of the electric push rod 45 is also fixedly connected to the output shaft of the stepper motor 44. The suction shell 46 is long and hollow inside. A suction slit is provided on the side wall of the suction shell 46 along the extension direction of the suction shell. The suction slit connects the inside of the suction shell to the inside of the roller 2. Two electric push rods 45 are fixedly connected to the two ends of the suction shell 46 in a one-to-one correspondence, and multiple suction pipes 42 are connected to the inside of the suction shell 46.

[0042] In some examples, the gas mill tube 4 also includes a negative pressure suction pipe 47, which is a pipe parallel to the main mill tube 41 and fixed to the suction support 43. The end of the negative pressure suction pipe 47 away from the spiral feed pipe 3 is connected to the air inlet pipe 10, and the other end is connected to the end of the main mill tube 41 near the spiral feed pipe 3. Multiple suction pipes 42 are connected to the inner cavity of the negative pressure suction pipe 47. High-pressure airflow creates a negative pressure in the inner cavity of the negative pressure suction pipe 47. Under this negative pressure, the suction pipes 42 absorb small-diameter coal gangue powder from the roller 2. Large-diameter coal gangue powder, due to its greater mass, cannot be absorbed into the negative pressure suction pipe 47. Similarly, steel spheres with a milling media diameter of 30mm to 40mm have a higher density and will not be adsorbed into the gas mill tube 4.

[0043] In some embodiments, the gas flow mill tube further includes a negative pressure control plate 48, which is an elongated plate adapted to the interior of the negative pressure suction pipe 47. Multiple protrusions 49 are fixed on one end face of the negative pressure control plate 48. When the negative pressure control plate 48 is movably disposed within the negative pressure suction pipe 47, a connection port of the suction pipe 42 is correspondingly disposed directly below each protrusion 49.

[0044] Both ends of the negative pressure control plate 48 are movably connected to the inner wall of the negative pressure suction pipe 47 via sliding grooves. An adjusting motor and a threaded rod are fixed inside the negative pressure suction pipe 47. The threaded rod passes through the negative pressure control plate 48 and is connected to a bearing on the lower side wall of the negative pressure suction pipe 47. An adjusting motor is fixed inside the negative pressure suction pipe 47 located above the negative pressure control plate 48. The output shaft of the adjusting motor is coaxially and fixedly connected to the threaded rod.

[0045] The suction pipe 42 extends into the negative pressure suction pipe 47, and a protrusion 49 is provided around the periphery of the suction pipe 42 inside the negative pressure suction pipe 47. The protrusion 49 is smoothly connected to the inner wall of the negative pressure suction pipe 47. When air enters the negative pressure suction pipe 47, the distance between the negative pressure control plate 48 and the connection port of the suction pipe 42 can be adjusted to control the negative pressure suction of the suction pipe 42. The protrusion 49 can increase the gas flow rate through the connection port of the suction pipe 42, thereby increasing the negative pressure suction of the suction pipe 42.

[0046] In some embodiments, the ultrafine grinding equipment for coal gangue further includes a pressure sensor 9. The support includes an upper support and a lower support, the lower support is fixed to the ground, the upper support is disposed on the lower support, and a pressure sensor 9 is fixed between the upper support and the lower support. The roller is connected to the upper support, and the pressure sensor 9 is used to measure the total mass of the roller and all its contents.

[0047] By acquiring the data collected by the pressure sensor 9, the mass of coal gangue powder inside the roller can be obtained, and the distribution map of coal gangue powder inside the roller can be analyzed in sequence, that is, the position of the highest point of coal gangue powder inside the roller. The stepper motor 44 and the electric push rod 45 can be controlled to move the suction shell 46 close to the highest point of coal gangue powder inside the roller, where the particle size of coal gangue powder is relatively the smallest.

[0048] The ultrafine grinding equipment for coal gangue also includes a controller, which is electrically connected to the stepper motor 44, the electric push rod 45, the air compressor 5, and the pressure sensor 9.

[0049] In some embodiments, the cyclone separator 6 includes a separator 61, a helical blade 62, and a discharge pipe 63. The separator 61 is a cylindrical tube with a discharge port on one end of its sidewall. The separator 61 shares a centerline with the main milling pipe 41, and the other end of the separator 61 communicates with the main milling pipe 41. The helical blade 62 is fixed to the separator 61 near the main milling pipe 41. The discharge pipe 63 is a cylindrical tube open at both ends. The discharge pipe 63 shares a centerline with the separator 61 and extends from inside the separator 61 to the outside of the roller 2. The other end of the discharge pipe 63 is a discharge port.

[0050] The spiral blade 62 is fixedly connected to the side wall of the separation tube 61. After the airflow passes through the spiral blade, a spiral airflow is formed. Coal gangue powder with a particle size greater than 100μm approaches the side wall of the separation tube 61 under the action of centrifugal force, while coal gangue powder with a particle size less than or equal to 100μm approaches the center line of the separation tube 61.

[0051] The particle size of the discharged coal gangue powder can be controlled by adjusting the length of the discharge pipe 63 within the separation pipe 61. In this application, the particle size of the discharged coal gangue powder is less than or equal to 100 μm.

[0052] The coal gangue ultrafine powder grinding equipment described in this application can realize the continuous production of coal gangue ultrafine powder, avoid deep ball milling of small-diameter coal gangue powder in the roller, reduce the energy consumption of coal gangue ultrafine powder grinding, reduce production costs, and improve product competitiveness.

[0053] On the other hand, the present invention also provides an ultrafine powder grinding process for coal gangue, which is applicable to the above-mentioned ultrafine powder grinding equipment for coal gangue.

[0054] The ultrafine grinding process for coal gangue includes:

[0055] S1. Select coal gangue powder with a particle size of 10mm~20mm.

[0056] S2. Add the coal gangue powder and ball milling media into the roller 2 and drive the roller 2 to rotate, so as to achieve the initial grinding of the coal gangue powder into fine coal gangue powder with a particle size of less than 10mm.

[0057] S3. Take coal gangue particles with a particle size of less than or equal to 2 mm from the fine coal gangue powder into the main flow mill 41.

[0058] S4. High-pressure airflow is injected into the main flow mill 41, which drives the coal gangue particles to move and collide at high speed in the gas turbulence, thereby achieving re-grinding of the coal gangue particles and discharging coal gangue particles with a particle size of less than or equal to 100μm as coal gangue ultrafine powder.

[0059] S5. Coal gangue particles with a particle size greater than 100μm are returned to roller 2 for further grinding.

[0060] In some embodiments, before step S3: drawing coal gangue particles with a particle size of less than or equal to 2 mm into the main flow mill 41, the ultrafine powder grinding process of the coal gangue further includes steps S21 and S22.

[0061] S21. Obtain the sum of the masses of coal gangue powder, ball milling media and fine coal gangue powder in the roller 2.

[0062] S22. Based on the sum of the masses of coal gangue powder, ball milling media, and fine coal gangue powder, a distribution map of coal gangue powder, ball milling media, and fine coal gangue powder is formed inside the roller 2. The fine coal gangue powder is then drawn from the top of the mixture of coal gangue powder, ball milling media, and fine coal gangue powder.

[0063] In some embodiments, a method for drawing coal gangue fine powder from the top of the mixture of coal gangue powder, ball milling media and coal gangue fine powder includes: drawing coal gangue fine powder with a mass of less than 5 mg into the main flow mill 41 by airflow.

[0064] In this application, the method for re-grinding coal gangue particles larger than 100 μm into roller 2 includes:

[0065] Small-diameter coal gangue powder passing through the main flow mill pipe 41 is driven by a high-speed airflow and passes through the spiral blades 62. The high-speed airflow forms a rotating airflow through the spiral blades 62, and the small-diameter coal gangue powder rotates with the high-speed airflow. At this time, under the action of centrifugal force, coal gangue particles with a diameter greater than 100μm are deflected towards the inner wall of the separation pipe 61, while coal gangue particles with a diameter less than or equal to 100μm are deflected towards the center of the separation pipe 61. Thus, coal gangue particles larger than 100μm move closer to the inner wall of the separation pipe 61 and towards the discharge port of the separation pipe 61, and are discharged into the roller with the high-speed airflow, while coal gangue particles with a diameter less than or equal to 100μm enter the discharge pipe 63 and are discharged from the discharge port of the discharge pipe 63 with the high-speed airflow.

[0066] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0067] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An ultrafine grinding device for coal gangue, characterized in that, include: A support frame, which is fixed to the ground; A roller, which is connected to the support via a bearing, is filled with ball milling media; The spiral feed tube is a cylindrical tube with one end extending into the roller and the spiral feed tube sharing the same center line with the roller. The spiral feed tube is connected to the roller. A gas flow mill tube is provided inside the roller. The gas flow mill tube is connected to the inside of the roller, and both ends of the gas flow mill tube are fixedly connected to the bracket. An air compressor is fixed to the outside of the roller and is connected to the gas flow mill tube; A cyclone separator tube, wherein the cyclone separator tube is a cylindrical tube, one end of the cyclone separator tube is connected to the gas flow mill tube, and the cyclone separator tube extends from inside the roller to the outside, and the cyclone separator tube located on the outside is provided with a discharge port. The gas flow mill tube includes: The main flow mill is a cylindrical tube. One end of the main flow mill is fixedly connected to the spiral feed tube, and the other end of the main flow mill is fixedly connected to the cyclone separator tube. Multiple high-pressure nozzles are provided on the main flow mill. The suction pipe is fixed to the main flow mill pipe and is connected to the air compressor. The suction pipe is also connected to the end of the main flow mill pipe near the spiral feed pipe. The suction pipe is configured to absorb materials with a particle size of less than or equal to 2 mm inside the roller. The cyclone separator tube includes: A separation tube, which is a cylindrical tube, has a discharge port on the side wall at one end. The separation tube shares a common centerline with the main flow mill, and the other end of the separation tube is connected to the main flow mill. The spiral blades are fixed in the separation tube near the main flow mill tube. The discharge pipe is a cylindrical tube with openings at both ends. The discharge pipe and the separation pipe share the same center line, and the discharge pipe extends from inside the separation pipe to the outside of the roller. The other end of the discharge pipe is the discharge port.

2. The ultrafine grinding equipment for coal gangue according to claim 1, characterized in that, The ultrafine grinding equipment for coal gangue also includes a pressure sensor; The support includes an upper support and a lower support. The lower support is fixed to the ground, and the upper support is set on the lower support. A pressure sensor is fixed between the upper support and the lower support. The roller is connected to the upper support. The pressure sensor is used to measure the total mass of the roller and all its contents.

3. The ultrafine grinding equipment for coal gangue according to claim 2, characterized in that, The suction tube is made of wear-resistant rubber; The gas flow mill tube also includes: Two suction brackets are fixed to the two ends of the main flow mill pipe in a one-to-one correspondence; Stepper motors are fixed on each material suction bracket; Each suction bracket is connected to the housing of an electric push rod via a bearing, and the housing of the electric push rod is also fixedly connected to the output shaft of the stepper motor. The suction shell is long and hollow inside. A suction slit is provided on the side wall of the suction shell along the extension direction of the suction shell. The suction slit connects the inside of the suction shell with the inside of the roller. Two electric push rods are fixedly connected to the two ends of the suction shell one to one, and multiple suction pipes are connected to the inside of the suction shell.

4. The ultrafine grinding equipment for coal gangue according to claim 3, characterized in that, The ultrafine grinding equipment for coal gangue also includes a controller, which is electrically connected to the stepper motor, electric push rod, air compressor and pressure sensor respectively.

5. The ultrafine grinding equipment for coal gangue according to claim 1, characterized in that, An external gear is coaxially fixed on the outer wall of the roller. The ultrafine grinding equipment for coal gangue also includes a drive motor, a reducer, and a drive gear. The drive motor is connected to the reducer, the output shaft of the reducer is coaxially and fixedly connected to the drive gear, and the drive gear meshes with the external gear.

6. An ultrafine grinding process for coal gangue, applicable to the ultrafine grinding equipment for coal gangue as described in any one of claims 1 to 5, characterized in that, The ultrafine grinding process for coal gangue includes: Select coal gangue powder with a particle size of 10mm~20mm; The coal gangue powder and ball milling media are added into the roller, and the roller is driven to rotate to achieve the initial grinding of the coal gangue powder into fine coal gangue powder with a particle size of less than 10 mm. Collect coal gangue particles with a particle size of 2 mm or less from the fine coal gangue powder into the main flow mill. High-pressure airflow is injected into the main flow mill, which drives the coal gangue particles to move and collide at high speed in the gas turbulence, thereby achieving further grinding of the coal gangue particles and discharging coal gangue particles with a particle size of less than or equal to 100μm as coal gangue ultrafine powder. Coal gangue particles with a diameter greater than 100μm are returned to the rollers for further grinding.

7. The ultrafine grinding process for coal gangue according to claim 6, characterized in that, Before drawing coal gangue particles with a diameter of 2 mm or less into the main flow mill, the ultrafine grinding process of the coal gangue further includes: The sum of the masses of coal gangue powder, ball milling media, and fine coal gangue powder inside the roller is obtained; Based on the sum of the masses of coal gangue powder, ball milling media, and fine coal gangue powder, a distribution map of coal gangue powder, ball milling media, and fine coal gangue powder is formed inside the roller. The fine coal gangue powder is then drawn from the top of the mixture of coal gangue powder, ball milling media, and fine coal gangue powder.

8. The ultrafine grinding process for coal gangue according to claim 6, characterized in that, A method for extracting the fine coal gangue powder from the top of the mixture of coal gangue powder, ball milling media, and fine coal gangue powder includes: Fine coal gangue powder with a mass of less than 5 mg is absorbed into the main flow mill pipe by airflow.

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