Superfine powder grinding process and grinding equipment for coal gangue

Abstract

The invention belongs to the field of coal gangue grinding, and relates to a coal gangue ultrafine powder grinding process and grinding equipment, which can realize efficient grinding of coal gangue ultrafine powder. According to the technical scheme, the device comprises a support, a roller, a spiral feeding pipe, a gas flow grinding pipe, an air compressor and a cyclone separation pipe. And the bracket is fixed on the ground. And the roller is connected with the bracket through a bearing. The whole spiral feeding pipe is a cylindrical pipe fitting, one end of the spiral feeding pipe extends into the roller, the spiral feeding pipe and the roller share the same center line, and the spiral feeding pipe is communicated with the roller. A gas flow grinding pipe is arranged in the roller and communicated with the interior of the roller, and the two ends of the gas flow grinding pipe are further fixedly connected with the support. The air compressor is fixed to the outer side of the roller and communicates with the gas flow grinding pipe. The whole cyclone separation pipe is a cylindrical pipe fitting, one end of the cyclone separation pipe is communicated with the gas flow grinding pipe, the cyclone separation pipe extends to the outside from the interior of the roller, and the cyclone separation pipe located outside is provided with a discharge port.

Description

Technical Field

[0001] The invention belongs to the field of coal gangue grinding and relates to a superfine powder grinding process and grinding equipment for coal gangue. Background Art

[0002] Gangue is a large-scale solid waste generated by the coal mining and washing industries. Previously, gangue was piled up in large quantities in open-air storage or landfills. Consequently, the mining and washing industries had to pay for its disposal. Furthermore, the accumulation of gangue could pollute surrounding land and groundwater through rainwater seepage.

[0003] In recent years, coal gangue has been developed and utilized on a large scale. Among them, coal gangue can be ground into fine powder to replace cement, but the cost-effectiveness is relatively low, and enterprises are not active in the reuse of coal gangue.

[0004] The gangue can be further ground into ultrafine powder, which can be used as adsorbent, ceramic raw material or participate in gas production, etc., and has high added economic value.

[0005] Currently, ball mills are commonly used to grind gangue into ultrafine powder. The particle size of ultrafine gangue powder ranges from 30μm to 200μm, while the output particle size of continuous ball mills ranges from 50μm to 1000μm. Grinding efficiency is highest for materials with a particle size of 200μm or larger. As grinding progresses, the gangue particle size decreases, and grinding efficiency also decreases, resulting in increased energy consumption for ball milling. Summary of the Invention

[0006] In order to overcome the defects in the above-mentioned related technologies, on the one hand, the present invention proposes an ultrafine powder grinding device for coal gangue, which can achieve efficient grinding of ultrafine powder of coal gangue.

[0007] To achieve the above technical objectives, the present invention provides an ultrafine powder grinding device for coal gangue. The ultrafine powder grinding device comprises a support, a roller, a spiral feed pipe, a gas mill pipe, an air compressor, and a cyclone separator. The support is fixed to the ground. The roller is connected to the support via a bearing. The spiral feed pipe is a cylindrical tube, one end of which extends into the roller. The spiral feed pipe and the roller are co-centering and in communication with the roller. A gas mill pipe is installed within the roller, communicating with the interior of the roller and fixedly connected to the support at both ends. The air compressor is fixed to the outside of the roller and in communication with the gas mill pipe. The cyclone separator is a cylindrical tube, one end of which communicates with the gas mill pipe. The cyclone separator extends from the roller to the outside, and the cyclone separator located outside is provided with a discharge port.

[0008] Preferably, the gas mill tube comprises a mill main tube and a suction tube. The mill main tube is a cylindrical tube, one end of which is fixedly connected to the spiral feed tube and the other end of which is fixedly connected to the cyclone separation tube. The mill main tube is equipped with multiple high-pressure nozzles. The suction tube is fixed to the mill main tube and communicates with the air compressor. It also communicates with the end of the mill main tube near the spiral feed tube. The suction tube is configured to absorb material with a particle size of less than or equal to 2 mm from the roller.

[0009] Preferably, the ultrafine gangue grinding equipment further includes a pressure sensor. The support includes an upper support and a lower support, the lower support being fixed to the ground, the upper support being mounted on the lower support, and a pressure sensor being 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 its contents.

[0010] Preferably, the suction pipe is made of wear-resistant rubber. The gas flow mill tube also includes: a suction bracket, a stepper motor, an electric push rod and a suction shell. Two suction brackets are fixed to the two ends of the flow mill main tube in a one-to-one correspondence. A stepper motor is fixed on each suction bracket. Each suction bracket is connected to the outer shell of an electric push rod through a bearing, and the outer shell 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 in a one-to-one correspondence, and multiple suction pipes are connected to the inside of the suction shell.

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

[0012] Preferably, the cyclone separator tube comprises: a separator tube, spiral blades, and a discharge pipe. The separator tube is a cylindrical tube with a discharge port provided on the sidewall at one end. The separator tube and the main flow mill pipe are co-centering, and the other end of the separator tube is connected to the main flow mill pipe. The spiral blades are fixed to the separator tube near the main flow mill pipe. The discharge pipe is a cylindrical tube with two open ends. The discharge pipe is co-centering with the separator tube and extends from the inside of the separator tube 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 to the outer wall of the roller. The ultrafine powder grinding equipment for coal gangue further includes a drive motor, a reducer, and a drive gear, wherein 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 a process for grinding gangue into ultrafine powder, which is suitable for the ultrafine powder grinding equipment for gangue mentioned above. The process for grinding gangue into ultrafine powder comprises: selecting gangue powder with a particle size of 10mm to 20mm. Adding the gangue powder and ball milling media into a roller, and driving the roller to rotate, so as to achieve preliminary grinding of the gangue powder into gangue fine powder, wherein the particle size of the gangue fine powder is less than 10mm. Suck the gangue particles with a particle size less than or equal to 2mm in the gangue fine powder into the main flow mill pipe. Jet a high-pressure airflow into the main flow mill pipe, driving the gangue particles to move and collide at high speed in the turbulent gas flow, so as to achieve re-grinding of the gangue particles, and discharge the gangue particles with a particle size less than or equal to 100μm as gangue ultrafine powder. The gangue particles with a particle size greater than 100 μm flow back into the roller and are ground again.

[0015] Preferably, before drawing the gangue particles having a particle size of 2 mm or less within the fine gangue powder into the fluidized bed mill main pipe, the ultrafine gangue grinding process further comprises: obtaining the sum of the masses of the gangue powder, ball milling media, and fine gangue powder within the roller. Based on the sum of the masses of the gangue powder, ball milling media, and fine gangue powder, a distribution diagram of the gangue powder, ball milling media, and fine gangue powder within the roller is formed, and the fine gangue powder is drawn from above the mixture of the gangue powder, ball milling media, and fine gangue powder.

[0016] Preferably, the method of drawing the gangue fine powder from the upper portion of the mixture of the gangue powder, ball milling media and gangue fine powder comprises: drawing the gangue fine powder with a mass of less than 5 mg into the fluid mill main pipe through air flow.

[0017] The beneficial effects of the present invention are: The present invention adopts a gas flow mill tube, which can absorb small-sized coal gangue particles in the roller into the gas flow mill tube, avoiding further grinding of small-sized coal gangue in the roller, and continuing to use the air flow mill to grind small-sized coal gangue in the gas flow mill tube. It can take into account the grinding efficiency of the ball milling process and the air flow milling process according to the particle size of the coal gangue, thereby improving the overall grinding efficiency of the coal gangue ultrafine powder, reducing energy consumption, and improving product competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. 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 any creative work.

[0019] Figure 1 It is a structural diagram of the present invention; Figure 2 It is an internal cross-sectional view of the present invention; Figure 3 is a cross-sectional view of a gas flow mill tube according to the present invention; Figure 4 This is a partial structural diagram of the gas flow mill tube of the present invention; Figure 5 It is a cross-sectional view of the suction shell of the present invention.

[0020] In the figure: 1. Bracket; 2. Roller; 3. Spiral feed pipe; 4. Gas flow mill tube; 5. Air compressor; 6. Cyclone separation tube; 9. Pressure sensor; 10. Inlet pipe; 41. Gas flow mill main tube; 42. Suction pipe; 43. Suction bracket; 44. Stepper motor; 45. Electric push rod; 46. Suction shell; 47. Negative pressure suction pipe; 48. Negative pressure control panel; 49. Protrusion; 61. Separation tube; 62. Spiral blade; 63. Discharge pipe. DETAILED DESCRIPTION

[0021] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 limiting the present invention.

[0023] 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 quantity of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0024] On the one hand, if Figures 1 to 5 As shown, some embodiments of the present invention provide an ultrafine powder grinding device for coal gangue. The ultrafine powder grinding device for coal gangue includes: a bracket 1, a roller 2, a spiral feed pipe 3, a gas flow mill pipe 4, an air compressor 5 and a cyclone separation pipe 6. The bracket 1 is fixed on the ground. The roller 2 is connected to the bracket 1 through a bearing. The spiral feed pipe 3 is a cylindrical pipe as a whole, and one end of the spiral feed pipe 3 extends into the roller 2, and the spiral feed pipe 3 and the roller 2 are co-centering, and the spiral feed pipe 3 is connected to the roller 2. A gas flow mill pipe 4 is provided in the roller 2, and the gas flow mill pipe 4 is connected to the inside of the roller 2, and the two ends of the gas flow mill pipe 4 are also fixedly connected to the bracket 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 separation tube 6 is a cylindrical tube as a whole. One end of the cyclone separation tube 6 is connected to the gas flow mill tube 4, and the cyclone separation tube 6 extends from the roller 2 to the outside. The cyclone separation tube 6 located outside is provided with a discharge port.

[0025] An external gear is coaxially fixed to the outer wall of the roller 2. The ultrafine powder grinding equipment for coal gangue also includes a drive motor, a reducer and a drive gear, wherein 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 is meshed with the external gear.

[0026] In this application, the roller 2 can be a cylindrical body with openings at both ends. A bracket 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, and the roller can be driven to rotate about its centerline under the action of a drive motor.

[0027] One end of the spiral feed tube 3 is connected to the feeding mechanism, and the other end extends into the interior of the roller. A discharge port is provided on the sidewall of the spiral feed tube inside the roller, while the spiral feed tube 3 located outside the roller is fixedly connected to the bracket. A spiral blade rod is provided within the spiral feed tube 3, which is used to feed the roller 2. In this application, the roller 2 can be fed with 10mm to 20mm coal gangue powder and ball milling media. The particle size of the ball milling media can be 30mm to 40mm.

[0028] The present application also includes an air inlet pipe 10, which is a tube with closed ends and coaxially mounted on the outside of the spiral feed pipe 3. The air inlet pipe 10 extends into the roller 2 and is fixedly connected to the inner ring of the bearing. The air inlet pipe 10 inside the roller 2 is provided with an opening that matches the feed port, facilitating the entry of materials from the spiral feed pipe 3 into the roller 2. The air inlet pipe 10 outside the roller 2 is connected to the air compressor 5 and is also connected to the gas flow mill pipe 4.

[0029] The gas flow mill tube 4 is connected to the cyclone separation tube 6.

[0030] During operation, gangue powder enters roller 2 through spiral feed tube 3. Roller 2 is also filled with ball milling media. As roller 2 rotates, the media and the gangue powder complete the ball milling process. This milling produces small-particle gangue powder within roller 2. Further milling of this small-particle gangue powder results in reduced efficiency and increased energy consumption.

[0031] The small-sized coal gangue powder is absorbed from the roller 2 into the gas fluid mill tube 4 , and the gas fluid mill tube 4 obtains the small-sized coal gangue powder and grinds it by using the air flow mill.

[0032] The small-particle gangue powder after the air flow mill passes through the cyclone separation tube 6, which can sort out the gangue powder with a particle size greater than 100 μm in the small-particle gangue powder and discharge it into the roller for ball milling again, and the gangue powder less than or equal to 100 μm is discharged as ultrafine gangue powder.

[0033] In some embodiments, the gas mill tube 4 comprises a mill main pipe 41 and a suction pipe 42. The mill main pipe 41 is a cylindrical tube, one end of which is fixedly connected to the spiral feed pipe 3, and the other end of which is fixedly connected to the cyclone separation pipe 6. The mill main pipe 41 is provided with multiple high-pressure nozzles. The suction pipe 42 is fixed to the mill main pipe 41 and communicates with the air compressor 5. The suction pipe 42 also communicates with the end of the mill main pipe 41 near the spiral feed pipe 3. The suction pipe 42 is configured to absorb material with a particle size of less than or equal to 2 mm from the roller 2.

[0034] The fluid mill main pipe 41 is a cylindrical pipe with a wear-resistant layer inside. The fluid mill main pipe 41 can be fixed coaxially with the spiral feed pipe 3. Multiple high-pressure nozzles are provided on the outer wall of the fluid mill main pipe 41. The multiple high-pressure nozzles are arranged in a row on the outer wall of the fluid mill main pipe 41. The multiple high-pressure nozzles can be connected to the intake pipe 10 through multiple ventilation steel pipes. Specifically, the ventilation steel pipes are straight rods, arranged parallel to one side of the fluid mill main pipe 41, one end of the ventilation steel pipes is connected to the intake pipe 10, and the other end is closed. Among them, the multiple ventilation steel pipes are arranged circumferentially on the outer side of the fluid mill main pipe, and the ventilation steel pipes are parallel to the fluid mill main pipe. Each ventilation steel pipe is connected to a corresponding number of high-pressure nozzles.

[0035] The suction pipe 42 is also connected to the air compressor 5. Using negative pressure, it draws small-sized gangue powder from the roller into the main fluid mill pipe 41. Specifically, small-sized gangue powder refers to powder with a particle size of 2 mm or less. The high-pressure airflow ejected from the high-pressure nozzle creates turbulent flow, driving the gangue powder into collision, thus achieving jet milling.

[0036] The suction pipe 42 is made of wear-resistant rubber. The gas flow mill tube 4 also includes: a suction bracket 43, a stepper motor 44, an electric push rod 45 and a suction shell 46. The two suction brackets 43 are fixed to the two ends of the flow mill main tube 41 in a one-to-one correspondence. A stepper motor 44 is fixed to each suction bracket 43. Each suction bracket 43 is connected to the outer shell of an electric push rod 45 through a bearing, and the outer shell 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 interior of the suction shell with the interior of the roller 2. The 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 interior of the suction shell 46.

[0037] In some examples, the gas mill tube 4 also includes a negative pressure suction pipe 47, which is a pipe running parallel to the mill main tube 41 and fixed to the suction bracket 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, while the other end of the negative pressure suction pipe 47 is connected to the end of the mill main 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 the action of the negative pressure, the suction pipes 42 absorb small-sized coal gangue powder from the roller 2. Large-sized coal gangue powder cannot be absorbed into the negative pressure suction pipe 47 due to its larger mass. Of course, steel spheres with a milling medium particle size of 30 mm to 40 mm have a higher density and are not attracted to the gas mill tube 4.

[0038] In some embodiments, the gas flow mill tube further includes a negative pressure control plate 48, which is a long strip of plate adapted to fit within the negative pressure suction pipe 47. Multiple protrusions 49 are fixed to one end face of the negative pressure control plate 48. When the negative pressure control plate 48 is movably positioned within the negative pressure suction pipe 47, a connection port for the suction pipe 42 is located directly below each protrusion 49.

[0039] The ends of the negative pressure control plate 48 are movably connected to the inner wall of the negative pressure suction pipe 47 through 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 above the negative pressure control plate 48. The output shaft of the adjusting motor is coaxially fixedly connected to the threaded rod.

[0040] Suction pipe 42 extends into the interior of negative pressure suction pipe 47. A protrusion 49 is provided around the periphery of suction pipe 42 within negative pressure suction pipe 47, smoothly connecting to the inner wall of negative pressure suction pipe 47. When air enters negative pressure suction pipe 47, the distance between negative pressure control plate 48 and the connection port of suction pipe 42 can be adjusted to control the negative pressure suction force of suction pipe 42. Protrusion 49 increases the flow rate of air passing through the connection port of suction pipe 42, thereby increasing the negative pressure suction force of suction pipe 42.

[0041] In some embodiments, the ultrafine powder grinding device for coal gangue further includes a pressure sensor 9. The bracket includes an upper bracket and a lower bracket, the lower bracket is fixed to the ground, the upper bracket is arranged on the lower bracket, and the pressure sensor 9 is fixed between the upper bracket and the lower bracket. The roller is connected to the upper bracket, and the pressure sensor 9 is used to measure the total mass of the roller and all contents inside.

[0042] By acquiring the data collected by the pressure sensor 9, the mass of the gangue powder in the roller can be obtained, and the distribution diagram of the gangue powder in the roller can be analyzed in turn, that is, the position of the highest point of the gangue powder in the roller. The stepper motor 44 and the electric push rod 45 can be controlled in turn to move the suction shell 46 close to the highest point of the gangue powder in the roller, where the particle size of the gangue powder is relatively smallest.

[0043] The ultrafine powder grinding device for coal gangue further includes a controller, which is electrically connected to the stepping motor 44, the electric push rod 45, the air compressor 5 and the pressure sensor 9 respectively.

[0044] In some embodiments, the cyclone separation tube 6 comprises a separation tube 61, a spiral blade 62 and a discharge tube 63. The separation tube 61 is a cylindrical tube, and a discharge port is arranged on the side wall of one end of the separation tube 61. The separation tube 61 is coaxial with the flow mill main tube 41, and the other end of the separation tube 61 communicates with the flow mill main tube 41. The spiral blade 62 is fixed near the flow mill main tube 41. The discharge tube 63 is a cylindrical tube with two open ends, and the discharge tube 63 is coaxial with the separation tube 61. The discharge tube 63 extends from the inside of the separation tube 61 to the outside of the roller 2, and the other end of the discharge tube 63 is a discharge port.

[0045] The spiral blade 62 is fixedly connected with the side wall of the separation tube 61. After the gas flow passes through the spiral blade, a spiral gas flow is formed. The coal gangue powder with a particle size greater than 100 μm is close to the side wall of the separation tube 61 under the action of centrifugal force, and the coal gangue powder with a particle size less than or equal to 100 μm is close to the center line of the separation tube 61.

[0046] By adjusting the length of the discharge tube 63 in the separation tube 61, the particle size of the discharged coal gangue powder can be controlled. In this application, the particle size of the discharged coal gangue powder is less than or equal to 100 μm.

[0047] The coal gangue superfine powder grinding device described in the application can realize continuous production of coal gangue superfine powder, avoid deep ball grinding of small particle size coal gangue powder in the roller, reduce the grinding energy consumption of coal gangue superfine powder, reduce the production cost, and improve the product competitiveness.

[0048] On the other hand, the application also provides a coal gangue superfine powder grinding process suitable for the coal gangue superfine powder grinding device described above.

[0049] The coal gangue superfine powder grinding process comprises: S1, selecting coal gangue powder with a particle size of 10 mm to 20 mm.

[0050] S2, adding the coal gangue powder and the ball milling medium into the roller 2, and driving the roller 2 to rotate, so as to realize preliminary grinding of the coal gangue powder into coal gangue fine powder with a particle size less than 10 mm.

[0051] S3, sucking coal gangue particles with a particle size less than or equal to 2 mm in the coal gangue fine powder into the flow mill main tube 41.

[0052] S4, injecting high-pressure gas flow into the flow mill main tube 41 to drive the coal gangue particles to move and collide at high speed in the gas turbulent flow, so as to realize regrinding of the coal gangue particles, and discharge the coal gangue particles with a particle size less than or equal to 100 μm as coal gangue superfine powder.

[0053] S5, the coal gangue particles with a size greater than 100 μm are returned to the roller 2 for regrinding.

[0054] In some embodiments, before the step S3 of sucking the coal gangue particles with a size less than or equal to 2 mm in the coal gangue fine powder into the flow mill main pipe 41, the superfine grinding process of the coal gangue further comprises steps S21 and S22.

[0055] S21, obtaining the sum of the mass of the coal gangue powder, the ball mill medium and the coal gangue fine powder in the roller 2.

[0056] S22, forming a distribution map of the coal gangue powder, the ball mill medium and the coal gangue fine powder in the roller 2 according to the sum of the mass of the coal gangue powder, the ball mill medium and the coal gangue fine powder, and sucking the coal gangue fine powder from the upper part of the mixture of the coal gangue powder, the ball mill medium and the coal gangue fine powder.

[0057] In some embodiments, the method of sucking the coal gangue fine powder from the upper part of the mixture of the coal gangue powder, the ball mill medium and the coal gangue fine powder comprises: sucking the coal gangue fine powder with a mass less than 5 mg into the flow mill main pipe 41 by air flow.

[0058] In the present application, the method of returning the coal gangue particles with a size greater than 100 μm to the roller 2 for regrinding comprises: The small-size coal gangue powder passing through the flow mill main pipe 41 is driven by the high-speed air flow passing through the spiral blade 62 to form a rotating air flow, and the small-size coal gangue powder rotates with the high-speed air flow. At this time, under the action of centrifugal force, the coal gangue particles with a size greater than 100 μm deviate to the inner side wall of the separation pipe 61, and the coal gangue particles with a size less than or equal to 100 μm deviate to the center of the separation pipe 61. Thus, the coal gangue particles with a size greater than 100 μm move close to the inner side wall of the separation pipe 61 and move to the discharge port of the separation pipe 61, and are discharged to the roller with the high-speed air flow, and the coal gangue particles with a size less than or equal to 100 μm enter the discharge pipe 63 and are discharged from the discharge port of the discharge pipe 63 with the high-speed air flow.

[0059] In the description of the present application, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0060] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An ultrafine powder grinding device for coal gangue, characterized in that: include: A bracket (1), wherein the bracket (1) is fixed on the ground; A roller (2), the roller (2) being connected to the bracket (1) via a bearing; A spiral feeding pipe (3), wherein the spiral feeding pipe (3) is a cylindrical pipe as a whole, one end of the spiral feeding pipe (3) extends into the roller (2), and the spiral feeding pipe (3) and the roller (2) share a common center line, and the spiral feeding pipe (3) is in communication with the roller (2); A gas flow mill tube (4), wherein the roller (2) is provided with a gas flow mill tube (4), the gas flow mill tube (4) is communicated with the interior of the roller (2), and both ends of the gas flow mill tube (4) are fixedly connected to the bracket (1); An air compressor (5), 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 tube (4); The cyclone separation tube (6) is a cylindrical tube as a whole, one end of the cyclone separation tube (6) is connected to the gas flow mill tube (4), and the cyclone separation tube (6) extends from the roller (2) to the outside, and the cyclone separation tube (6) located outside is provided with a discharge port.

2. The ultrafine powder grinding equipment for coal gangue according to claim 1, characterized in that: The gas flow mill tube (4) comprises: A fluid mill main pipe (41), the fluid mill main pipe (41) is a cylindrical tube body, one end of the fluid mill main pipe (41) is fixedly connected to the spiral feed pipe (3), the other end of the fluid mill main pipe (41) is fixedly connected to the cyclone separation pipe (6), and a plurality of high-pressure nozzles are provided on the fluid mill main pipe (41); A suction pipe (42), the suction pipe (42) is fixed on the fluid mill main pipe (41), the suction pipe (42) is connected to the air compressor (5), and the suction pipe (42) is also connected to the fluid mill main pipe (41) near one end of the spiral feed pipe (3), and the suction pipe (42) is configured to absorb materials with a particle size less than or equal to 2 mm in the roller (2).

3. The ultrafine powder grinding equipment for coal gangue according to claim 2, characterized in that: The ultrafine powder grinding device for coal gangue further includes a pressure sensor (9); The bracket (1) comprises an upper bracket and a lower bracket, the lower bracket is fixed on the ground, the upper bracket is arranged on the lower bracket, and a pressure sensor (9) is fixed between the upper bracket and the lower bracket, the roller (2) is connected to the upper bracket, and the pressure sensor (9) is used to measure the total mass of the roller (2) and all contents inside.

4. The ultrafine powder grinding equipment for coal gangue according to claim 3, characterized in that: The suction pipe (42) is made of wear-resistant rubber; The gas flow mill tube (4) further comprises: Suction brackets (43), two suction brackets (43) are fixed to both ends of the fluid mill main pipe (41) in a one-to-one correspondence; A stepper motor (44), wherein each material suction bracket (43) is fixed with a stepper motor (44); An electric push rod (45), each material 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 stepping 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 (46). The suction slit connects the inside of the suction shell (46) with 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 a plurality of suction pipes (42) are connected to the inside of the suction shell (46).

5. The ultrafine powder grinding equipment for coal gangue according to claim 4, characterized in that: The ultrafine powder grinding equipment for coal gangue further comprises a controller, which is electrically connected to the stepping motor (44), the electric push rod (45), the air compressor (5) and the pressure sensor (9) respectively.

6. The ultrafine powder grinding equipment for coal gangue according to claim 5, characterized in that: The cyclone separation tube (6) comprises: A separation tube (61), the separation tube (61) is a cylindrical tube, a discharge port is provided on the side wall of one end of the separation tube (61), the separation tube (61) and the fluid mill main pipe (41) are co-centering, and the other end of the separation tube (61) is in communication with the fluid mill main pipe (41); A spiral blade (62), wherein the separation tube (61) is fixed with the spiral blade (62) at a position close to the fluid mill main tube (41); The discharge pipe (63) is a cylindrical tube body with openings at both ends. The discharge pipe (63) and the separation pipe (61) share a common centerline, and the discharge pipe (63) extends from the separation pipe (61) to the outside of the roller (2). The other end of the discharge pipe (63) is a discharge port.

7. The ultrafine powder grinding equipment for coal gangue according to claim 6, characterized in that: An external gear is coaxially fixed on the outer wall of the roller (2); The ultrafine powder grinding equipment for coal gangue also includes a driving motor, a reducer and a driving gear. The driving motor is connected to the reducer. The output shaft of the reducer is coaxially fixedly connected to the driving gear, and the driving gear is meshed with the external gear.

8. A process for grinding ultrafine powder of coal gangue, applicable to the ultrafine powder grinding equipment of coal gangue according to any one of claims 1 to 7, characterized in that: The ultrafine powder grinding process of coal gangue includes: Select coal gangue powder with a particle size of 10mm~20mm; Adding the gangue powder and the ball milling medium into the roller, and driving the roller to rotate, so as to achieve preliminary grinding of the gangue powder into gangue fine powder, wherein the particle size of the gangue fine powder is less than 10 mm; Suck the gangue particles with a particle size less than or equal to 2 mm in the gangue fine powder into the fluid mill main pipe (41); A high-pressure airflow is injected into the fluid mill main pipe (41), driving the gangue particles to move and collide at high speed in the turbulent gas flow, thereby re-grinding the gangue particles and discharging the gangue particles with a particle size of less than or equal to 100 μm as ultrafine gangue powder; The gangue particles with a particle size greater than 100 μm flow back into the roller (2) and are ground again.

9. The ultrafine powder grinding process of coal gangue according to claim 8, characterized in that: Before the gangue particles with a particle size of less than or equal to 2 mm in the gangue fine powder are sucked into the fluid mill main pipe (41), the gangue ultrafine powder grinding process further includes: Obtaining the sum of the masses of the gangue powder, the ball milling medium, and the gangue fine powder in the roller (2); According to the sum of the masses of the gangue powder, the ball milling medium and the gangue fine powder, a distribution diagram of the gangue powder, the ball milling medium and the gangue fine powder in the roller (2) is formed, and the gangue fine powder is sucked from the upper part of the mixture of the gangue powder, the ball milling medium and the gangue fine powder.

10. The ultrafine powder grinding process of coal gangue according to claim 8, characterized in that: The method of extracting the gangue fine powder from the upper part of the mixture of the gangue powder, the ball milling medium and the gangue fine powder comprises: The coal gangue fine powder with a mass of less than 5 mg is absorbed into the flow mill main pipe (41) by the air flow.

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