Coal mine flotation device for coal preparation plant
By installing buffer rollers and buffer plates of the blocking components in the flotation cell, the problem of large air bubbles affecting the flotation efficiency in the flotation machine is solved, and effective contact between air bubbles and clean coal is achieved, thereby improving the flotation efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-07
- Publication Date
- 2026-04-17
AI Technical Summary
In the existing flotation process, due to improper selection or insufficient dosage of frother, excessive aeration, or low pulp concentration, large bubbles are generated and rise too quickly, affecting the rising path of conventional bubbles and the probability and adhesion time of collision with target coal particles, thus reducing flotation efficiency.
An interception assembly, including a buffer roller and a buffer plate, is installed in the flotation cell. The drive assembly moves back and forth to create turbulence, intercepting and breaking larger bubbles, ensuring that regular bubbles float normally. The mixing of the slurry and the scraping of clean coal are optimized through the stirring structure and scraper structure.
It effectively intercepts and breaks up larger air bubbles, prolongs the contact time between conventional air bubbles and clean coal in the slurry, improves flotation efficiency, reduces the impact of larger air bubbles on conventional air bubbles, and enhances the adhesion of coal slime.
Smart Images
Figure CN121869608A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of flotation equipment technology, specifically to a coal mine flotation device for a coal preparation plant. Background Technology
[0002] In the field of coal mine flotation, mechanically agitated flotation machines are the most widely used core separation equipment. Their working principle mainly relies on a high-speed rotating impeller-stator system at the bottom. This system, on the one hand, uses agitation to suspend coal and gangue particles in the slurry; on the other hand, it generates a large number of microbubbles through a frother, causing the clean coal to adhere to the foam, float to the surface of the slurry, and then form mineralized foam that is scraped off by a scraper, completing the flotation process.
[0003] However, the existing method of generating and releasing bubbles at the impeller at the bottom of the flotation cell has certain drawbacks in actual flotation. Due to various reasons such as improper selection of frother, insufficient dosage, excessive aeration, or low pulp concentration, large bubbles are easily generated in the flotation machine. These bubbles, due to their greater buoyancy and lower movement resistance in low-viscosity pulp, will rise at a relatively fast speed, affecting nearby bubbles of normal size. The excessively fast rising speed can disrupt the rising path of normal bubbles, shorten their residence time in the effective volume of the flotation cell, and result in insufficient collision probability and adhesion time with target coal particles. As a result, the degree of coal slime adhesion is reduced, which is not conducive to improving flotation efficiency. Summary of the Invention
[0004] The purpose of this invention is to provide a coal flotation device for a coal preparation plant to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, the present invention provides the following technical solution: a coal flotation device for a coal preparation plant, comprising a flotation cell, wherein the flotation cell is provided with a stirring structure for stirring and foaming, and a scraper structure for scraping out clean coal, and further comprising:
[0006] An blocking assembly is disposed within the flotation cell. The blocking assembly includes several buffer components disposed inside the flotation cell to block air bubbles, and a driving assembly for driving the buffer components to reciprocate within the flotation cell. In operation, the driving assembly drives the buffer components to reciprocate within the flotation cell, creating turbulence in the water and breaking up the blocked air bubbles.
[0007] Preferably, the buffer component includes a plurality of buffer rods disposed in the flotation cell, each buffer rod having a movable plate A fixedly connected to both ends, and a sliding groove A is provided on the inner wall of the flotation cell, with the movable plate A sliding up and down within the sliding groove A.
[0008] Preferably, the driving component includes a movable motor fixedly connected to the surface of the flotation cell, an eccentric block fixedly connected to the output end of the movable motor, a through hole opened on the surface of the flotation cell, and a connecting plate A passing through the through hole, one end of the connecting plate A being fixedly connected to the movable plate A, and the other end having a transverse groove, with one end of the eccentric block sliding in the transverse groove.
[0009] Preferably, a limiting block is fixedly connected to the inner wall of the slide groove A, and the movable plate A is slidably connected to the limiting block.
[0010] Preferably, the buffer component includes several buffer plates disposed inside the flotation cell, and movable plates B are disposed on both sides of the buffer plates. The buffer plates are rotatably connected to the movable plates B. A sliding groove B is provided on the inner wall of the flotation cell, and the movable plates B slide left and right in the sliding groove B.
[0011] Preferably, the driving component includes a movable motor fixedly connected to the surface of the flotation cell, an eccentric block fixedly connected to the output end of the movable motor, a through hole opened on the surface of the flotation cell, and a connecting plate B passing through the through hole, one end of the connecting plate B being fixedly connected to the movable plate B, and the other end having a vertical groove, and one end of the eccentric block sliding in the vertical groove.
[0012] Preferably, a counterweight is provided at the bottom of the buffer plate.
[0013] Preferably, the stirring structure includes a central column fixedly connected to the inner wall of the flotation cell, a rotating shaft rotatably connected inside the central column, an impeller fixedly connected to the bottom of the rotating shaft, a chemical inlet pipe fixedly connected to the surface of the central column, the chemical inlet pipe passing through the flotation cell and connected to an external frother dosing device, a drive motor fixedly connected to the top of the flotation cell, a synchronous pulley fixedly connected to the top of the rotating shaft, and the output end of the drive motor connected to the synchronous pulley via a synchronous belt.
[0014] Preferably, the scraper assembly includes a scraper component rotatably connected to the surface of the flotation cell, one end of the scraper component is fixedly connected to a movable wheel, a drive component is installed on the top of the flotation cell, and the output end of the drive component is connected to the movable wheel via a belt.
[0015] Compared with the prior art, the beneficial effects of the present invention are:
[0016] This invention uses several buffer rollers spaced at regular intervals to facilitate the normal upward movement of bubbles of normal size through the gaps between the buffer rollers, while blocking larger bubbles and preventing them from rising too fast and affecting the normal bubbles. In addition, the reciprocating movement of the buffer rollers generates shear turbulence in the flotation solution, which facilitates the disruption of the stable state of more fragile large bubbles, causing them to break up and further reducing the impact of large bubbles on normal bubbles.
[0017] This invention sets up several buffer plates with a certain spacing, and moves them laterally left and right. The buffer plates are affected by resistance and swing left and right in the flotation solution. On the one hand, it can push the water flow to form a stable wave flow, which facilitates the transport of conventional bubbles. The wave flow changes the vertical upward path of conventional bubbles into a wave-like movement, prolonging their contact time with the clean coal in the slurry. On the other hand, the left and right swing of the counterweight at the bottom of the buffer plate disrupts the stable state of larger bubbles, causing them to break and avoiding affecting the normal floating of conventional bubbles. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;
[0019] Figure 2 This is a cross-sectional view used in this invention to illustrate the internal structure of the flotation cell;
[0020] Figure 3 This is a schematic diagram illustrating a first embodiment of the buffer component of the present invention;
[0021] Figure 4 This is a schematic diagram illustrating a second embodiment of the buffer component according to the present invention;
[0022] Figure 5 This is a schematic diagram illustrating the connection state between the buffer rod and the movable plate A according to the present invention;
[0023] Figure 6 This is a schematic diagram illustrating the connection state between the buffer plate and the movable plate B according to the present invention.
[0024] In the diagram: 1. Flotation cell; 2. Central column; 21. Rotating shaft; 211. Impeller; 212. Synchronous pulley; 213. Synchronous belt; 214. Drive motor; 215. Inlet pipe; 3. Scraper; 31. Movable wheel; 311. Belt; 312. Drive component; 4. Buffer roller; 41. Movable plate A; 411. Slide A; 412. Limiting block; 413. Connecting plate A; 414. Horizontal groove; 42. Buffer plate; 421. Counterweight; 422. Movable plate B; 423. Slide B; 424. Connecting plate B; 425. Vertical groove; 43. Movable motor; 431. Eccentric block. Detailed Implementation
[0025] 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.
[0026] This invention discloses a coal flotation device for a coal preparation plant, such as... Figure 1-6 As shown, it includes a flotation cell 1. Only a single flotation cell 1 is shown here. In actual operation, multiple flotation cells 1 can be combined and flotation can be carried out simultaneously, which is more efficient. The flotation cell 1 should have an inlet and an outlet for entering and discharging coal slurry. This is existing technology and will not be described in detail here. The flotation cell 1 is equipped with a stirring structure for stirring and foaming, and a scraper structure for scraping out clean coal. The opening of the flotation cell 1 is located at the position of the scraper structure. The clean coal floating on the surface of the coal slurry is continuously scraped out by the scraper structure.
[0027] It also includes a blocking component, which is disposed in the flotation cell 1. The blocking component includes several buffers disposed inside the flotation cell 1 to block bubbles, and a driving component for driving the buffers to move back and forth in the flotation cell 1. In the working state, the driving component drives the buffers to move back and forth in the flotation cell 1, forming turbulence in the water and breaking up the blocked bubbles.
[0028] The buffer component includes several buffer rods 4 disposed in the flotation cell 1. The buffer rods 4 are arranged horizontally with a relatively equal spacing between adjacent ones. The spacing between two buffer rods 4 is set according to the size of the regular bubbles and the larger bubbles to ensure that the spacing between adjacent buffer rods 4 can allow regular bubbles to pass through while blocking larger bubbles. Both ends of the buffer rods 4 are fixedly connected to movable plates A41. The inner wall of the flotation cell 1 is provided with a sliding groove A411, and the movable plate A41 slides up and down in the sliding groove A411.
[0029] Specifically, by setting up an array of buffer rollers 4, it is convenient to selectively intercept a large number of bubbles generated at the bottom of the flotation cell 1. Specifically, a larger number of conventional bubbles can pass through the array of buffer rollers 4, while a smaller number of larger bubbles will be intercepted because their diameter is larger than the distance between adjacent buffer rollers 4. This prevents larger bubbles from affecting the normal contact of other conventional bubbles and carrying clean coal due to excessive rising speed. In addition, by driving the buffer rollers 4 array to reciprocate, it is convenient to break up the more fragile large bubbles, causing them to break and preventing the large bubbles from continuing to increase in volume by adhering to and merging with ordinary bubbles.
[0030] In this embodiment, as Figure 3As shown, the drive assembly includes a movable motor 43 fixedly connected to the surface of the flotation cell 1. An eccentric block 431 is fixedly connected to the output end of the movable motor 43. Connecting shafts are provided on both sides of the eccentric block 431, but the two connecting shafts are not concentric. One end of the connecting shaft is fixedly connected to the output end of the movable motor 43. A through hole is provided on the surface of the flotation cell 1, and a connecting plate A413 passes through the through hole. One end of the connecting plate A413 is fixedly connected to the movable plate A41, and the other end has a transverse groove 414. One end of the eccentric block 431 slides within the transverse groove 414. This end is the end of the eccentric block 431 furthest from the movable motor 43, therefore this end is connected to the movable motor 43... The output ends are not concentric. Under the rotation of the movable motor 43, one end sliding in the transverse groove 414 will rotate around the output end of the movable motor 43, and drive the transverse groove 414 and the connecting plate A413 to move up and down reciprocally. Then, through the output of the movable motor 43, the movable plate A41 and the buffer roller 4 will move up and down in the vertical direction. Specifically, when the buffer roller 4 moves up and down inside the flotation liquid in the flotation cell 1, it will continuously generate shear force on the water flow. This is convenient for breaking up the more fragile large bubbles. Since the conventional bubbles are small in size and have a smaller contact area with the water flow, they are not easily broken by shear force, so they are easy to pass through the array of buffer rollers 4.
[0031] It is worth noting that the output power and rotation speed of the movable motor 43 are related to the speed at which the buffer roller 4 moves up and down, and further to the magnitude of the shear force exerted by its up and down movement on the liquid. The magnitude of this shear force should be set to be sufficient to break larger bubbles without affecting the regular bubbles. If necessary, the rotation speed of the movable motor 43 can be slowed down to further reduce the speed at which the buffer roller 4 moves up and down, so as to avoid having a significant impact on the rising of the regular bubbles.
[0032] The movable plate A41 slides up and down within the slide groove A411, and a limiting block 412 is fixedly connected to the inner wall of the slide groove A411. The movable plate A41 and the limiting block 412 are slidably connected. Through the limiting action of the limiting block 412, the movable plate A41 can only move up and down. In conjunction with the limiting action of the slide groove A411, its controllability is improved.
[0033] like Figure 4 and Figure 6 As shown, in a parallel embodiment, unlike the buffer in the above embodiment, this embodiment proposes another implementation of the buffer. The buffer includes several buffer plates 42 disposed inside the flotation cell 1. Movable plates B422 are disposed on both sides of the buffer plates 42. The buffer plates 42 and the movable plates B422 are rotatably connected. A sliding groove B423 is provided on the inner wall of the flotation cell 1. The movable plates B422 slide left and right in the sliding groove B423. The movable plates B422 and the sliding groove B423 are laterally slidably connected.
[0034] The driving assembly includes a movable motor 43 fixedly connected to the surface of the flotation cell 1. An eccentric block 431 is fixedly connected to the output end of the movable motor 43. A through hole is opened on the surface of the flotation cell 1, and a connecting plate B424 passes through the through hole. One end of the connecting plate B424 is fixedly connected to the movable plate B422, and the other end is provided with a vertical groove 425. One end of the eccentric block 431 slides in the vertical groove 425. Due to the setting of the vertical groove 425, under the rotation of the movable motor 43, the end of the eccentric block 431 sliding in the vertical groove 425 will rotate around the output end of the movable motor 43, and drive the horizontal and vertical grooves 425 and the connecting plate B424 to reciprocate in the horizontal direction, thereby causing the movable plate B422 to drive several buffer plates 42 to swing back and forth.
[0035] Specifically, when the motor 43 outputs power, causing the movable plate B422 to drive several buffer plates 42 to swing back and forth, the buffer plates 42 are rotatably connected to the movable plate B422 and located in the flotation liquid inside the flotation cell 1. Due to the influence of liquid resistance, the buffer plates 42 will rotate at a certain angle on the movable plate B422. While following the movable plate B422 to move left and right, they will also rotate in both directions to swing back and forth, thereby pushing the water flow to form a stable wave flow. This facilitates the stable transport path of conventional bubbles, allowing them to float more evenly to the liquid surface along the path. In addition, the wave flow changes the vertical upward path of conventional bubbles into a wave-like movement, prolonging their contact time with the clean coal in the slurry, increasing the amount of clean coal adhering, and further improving the flotation efficiency. The swinging buffer plates 42 also break up larger bubbles, reducing the impact of larger bubbles on conventional bubbles.
[0036] It is worth noting that since the buffer plate 42 moves back and forth in the flotation cell 1, its lateral swing range is large. Therefore, the spacing between adjacent buffer plates 42 can be increased accordingly. There is no need to deliberately set the spacing size to allow only regular bubbles to pass through. This can effectively reduce the amount of buffer plates 42 used and reduce costs. By using a buffer plate 42 array with a larger spacing, the influence of the buffer plate 42 on the floating of bubbles in the flotation cell 1 can also be further reduced.
[0037] The bottom of the buffer plate 42 is provided with a counterweight 421. By setting the counterweight 421, the inertia of the buffer plate 42 during forward and reverse rotation is further increased. Since larger bubbles have a larger surface area and are more easily deformed, they have a larger contact point with the surface of the buffer plate 42 and are more likely to stick to the buffer plate 42. This allows the buffer plate 42 to break up the larger bubbles that are stuck together or passing through by swinging. On the other hand, since conventional bubbles have a small surface area and a high surface curvature, they have a small contact point with the buffer plate 42 and are less likely to stick to the surface of the buffer plate 42. They are more likely to pass through the buffer plate 42 and float in the wave flow formed by the swinging of the buffer plate 42.
[0038] like Figure 1 , Figure 2 As shown, the stirring structure includes a central column 2 fixedly connected to the inner wall of the flotation cell 1. A rotating shaft 21 is rotatably connected inside the central column 2. An impeller 211 is fixedly connected to the bottom of the rotating shaft 21. The impeller 211 is used to stir the slurry flow in the flotation cell 1, so that the clean coal is dispersed and facilitates bubble adhesion. A reagent inlet pipe 215 is fixedly connected to the surface of the central column 2. The reagent inlet pipe 215 passes through the flotation cell 1 and is connected to an external frother dosing device. The external frother dosing device adds frother to the reagent inlet pipe 215, thereby facilitating the impeller 211. Rotation generates more bubbles, achieving adhesion of clean coal. A drive motor 214 is fixedly connected to the top of the flotation cell 1, and a synchronous pulley 212 is fixedly connected to the top of the rotating shaft 21. The output end of the drive motor 214 is connected to the synchronous pulley 212 through the synchronous belt 213. Through the output of the drive motor 214, its output end is driven to rotate, which in turn drives the synchronous belt 213 to rotate the synchronous pulley 212. The rotation of the synchronous pulley 212 will drive the rotating shaft 21 and the impeller 211 to rotate, thereby agitating and dispersing the slurry inside the flotation cell 1.
[0039] like Figure 1 , Figure 2 As shown, the scraper assembly includes a scraper 3 rotatably connected to the surface of the flotation cell 1. The scraper 3 is generally a rotating structure with two scraper blades, used to scrape off the clean coal foam floating on the surface of the slurry. This is existing technology and will not be described in detail here. One end of the scraper 3 is fixedly connected to a movable wheel 31. A drive 312 is installed on the top of the flotation cell 1. The output end of the drive 312 is connected to the movable wheel 31 via a belt 311. The drive 312 is generally a combination of a servo motor and a reducer. The output end of the servo motor is connected to the input end of the reducer. The output end of the reducer is connected to the movable wheel 31 via a belt 311. In this way, when the servo motor outputs, after deceleration, it drives the belt 311 to drive the movable wheel 31, thereby driving the scraper 3 to rotate and continuously scrape off clean coal for flotation.
[0040] The contents not described in detail in this description are existing technologies known to those skilled in the art. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A coal flotation device for a coal preparation plant, comprising a flotation cell (1), wherein the flotation cell (1) is provided with a stirring structure for stirring and foaming and a scraper structure for scraping out clean coal, characterized in that: Also includes: The blocking component is disposed in the flotation cell (1). The blocking component includes several buffer components disposed inside the flotation cell (1) to block bubbles, and a driving component for driving the buffer components to move back and forth in the flotation cell (1). In the working state, the driving component drives the buffer components to move back and forth in the flotation cell (1), forming turbulence in the water and breaking up the blocked bubbles.
2. The coal flotation device for a coal preparation plant according to claim 1, characterized in that: The buffer component includes several buffer rods (4) disposed in the flotation cell (1). Both ends of the buffer rods (4) are fixedly connected to movable plates A (41). The inner wall of the flotation cell (1) is provided with a sliding groove A (411). The movable plate A (41) slides up and down in the sliding groove A (411).
3. The coal flotation device for a coal preparation plant according to claim 1, characterized in that: The driving assembly includes a movable motor (43) fixedly connected to the surface of the flotation cell (1). An eccentric block (431) is fixedly connected to the output end of the movable motor (43). A through hole is opened on the surface of the flotation cell (1), and a connecting plate A (413) passes through the through hole. One end of the connecting plate A (413) is fixedly connected to the movable plate A (41), and a transverse groove (414) is opened at the other end. One end of the eccentric block (431) slides in the transverse groove (414).
4. A coal flotation device for a coal preparation plant according to claim 2, characterized in that: The inner wall of the slide groove A (411) is fixedly connected to the limiting block (412), and the movable plate A (41) is slidably connected to the limiting block (412).
5. A coal flotation device for a coal preparation plant according to claim 1, characterized in that: The buffer component includes several buffer plates (42) disposed inside the flotation cell (1). Movable plates B (422) are provided on both sides of the buffer plate (42). The buffer plate (42) is rotatably connected to the movable plate B (422). A sliding groove B (423) is provided on the inner wall of the flotation cell (1). The movable plate B (422) slides left and right in the sliding groove B (423).
6. A coal flotation device for a coal preparation plant according to claim 1, characterized in that: The driving assembly includes a movable motor (43) fixedly connected to the surface of the flotation cell (1). An eccentric block (431) is fixedly connected to the output end of the movable motor (43). A through hole is opened on the surface of the flotation cell (1), and a connecting plate B (424) passes through the through hole. One end of the connecting plate B (424) is fixedly connected to the movable plate B (422), and the other end is provided with a vertical groove (425). One end of the eccentric block (431) slides in the vertical groove (425).
7. A coal flotation device for a coal preparation plant according to claim 5, characterized in that: The bottom of the buffer plate (42) is provided with a counterweight (421).
8. The coal preparation flotation device according to claim 1, characterized in that: The stirring structure includes a central column (2) fixedly connected to the inner wall of the flotation cell (1), a rotating shaft (21) rotatably connected inside the central column (2), an impeller (211) fixedly connected to the bottom of the rotating shaft (21), a drug inlet pipe (215) fixedly connected to the surface of the central column (2), the drug inlet pipe (215) penetrates the flotation cell (1) and is connected to an external frother dosing device, a drive motor (214) fixedly connected to the top of the flotation cell (1), a synchronous pulley (212) fixedly connected to the top of the rotating shaft (21), and the output end of the drive motor (214) is connected to the synchronous pulley (212) through a synchronous belt (213).
9. A coal preparation flotation device according to claim 1, characterized in that: The scraper assembly includes a scraper component (3) rotatably connected to the surface of the flotation cell (1). One end of the scraper component (3) is fixedly connected to a movable wheel (31). A drive component (312) is installed on the top of the flotation cell (1). The output end of the drive component (312) is connected to the movable wheel (31) via a belt (311).