Coal dressing bubbling flotation device

Abstract

The invention relates to the technical field of flotation devices, and discloses a coal dressing bubbling flotation device which comprises a flotation tank, a stirring structure used for stirring and bubbling and a scraping plate structure used for scraping clean coal are arranged in the flotation tank, and the coal dressing bubbling flotation device further comprises a blocking assembly arranged in the flotation tank and used for blocking the clean coal. The blocking assembly comprises a plurality of baffles arranged in the flotation tank, blocking nets A are arranged on the inner walls of the baffles, through holes are formed in the surface of the flotation tank, a movable plate slides through the through holes, the movable plate is connected with the baffles through connecting shafts, and the flotation tank is connected with the movable plate through a hydraulic cylinder. The separating assembly is used for separating bubbles attached to the surface of the blocking net A. The contact time of large bubbles and clean coal in ore pulp can be prolonged, the coal slime adhesion amount is increased, and the overall efficiency of flotation coal dressing is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of flotation equipment technology, specifically to a coal preparation foaming flotation device. 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 too quickly. The excessively rapid rise significantly shortens the residence time of the bubbles in the effective volume of the flotation cell, resulting in a serious lack of collision probability and adhesion time with the target coal particles. As a result, the degree of coal slime adhesion is reduced. At the same time, excessively large bubbles are often accompanied by weakened liquid film strength and poor stability. They are more likely to break during the process of rising to the foam layer, which not only causes the attached clean coal to fall off and the recovery rate to decrease, but also damages the stability of the foam layer, ultimately leading to a series of problems such as deterioration of flotation selectivity and fluctuation in the quality of clean coal products. Summary of the Invention

[0004] The purpose of this invention is to provide a coal preparation flotation device 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 preparation flotation device, 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;

[0006] It also includes a blocking component disposed within the flotation cell. The blocking component includes several baffles disposed within the flotation cell. A blocking mesh A is disposed on the inner wall of the baffle. A through hole is opened on the surface of the flotation cell, and a movable plate slides through the through hole. The movable plate is connected to the baffle via a connecting shaft. The flotation cell is connected to the movable plate via a hydraulic cylinder. It also includes a detachment component for separating bubbles adhering to the surface of the blocking mesh A.

[0007] Preferably, the separation component includes a plurality of nozzles fixedly connected to the inner wall of the flotation cell, one end of each nozzle being fixedly connected to a nozzle head, the nozzle head being in close contact with the moving plate.

[0008] Preferably, the end of the nozzle away from the nozzle passes through the flotation cell and is fixedly connected to a connecting pipe, which is connected to an external water source device.

[0009] Preferably, the detachment component includes a gear, the connecting shaft passes through the movable plate and is connected to the gear, and the connecting shaft is rotatably connected to the surface of the movable plate, and the inner wall of the flotation tank is provided with a rack adapted to the gear.

[0010] Preferably, the surface of the connecting shaft is fitted with a sleeve, and a torsion spring is disposed inside the sleeve. The two ends of the torsion spring are respectively connected to the gear and the moving plate.

[0011] Preferably, the blocking assembly includes several oppositely arranged guide plates, with two opposite guide plates fixedly connected to the surface of the connecting shaft. A blocking net B is provided inside the guide plate, and the included angle between the two opposite guide plates is "V".

[0012] 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.

[0013] 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.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] This invention, by setting up baffles and a barrier net, allows conventional bubbles to pass smoothly through the barrier net, while larger bubbles are blocked and adhere to its surface. This prolongs the contact time between the larger bubbles and the clean coal in the slurry. Compared with ordinary bubbles, it can significantly increase the amount of coal slime adhering to them. Furthermore, as the baffles and barrier net move upward, the larger bubbles adhering to their surface move synchronously, experiencing less obstruction, greater stability, and less rupture. This increases the amount of clean coal carried and the efficiency of foam operation, thereby improving the overall efficiency of coal preparation to a certain extent. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 This is a cross-sectional view used in this invention to illustrate the internal structure of the flotation cell;

[0018] Figure 3 This is a schematic diagram illustrating a first embodiment of the present invention for use with a detachable component;

[0019] Figure 4 This is a schematic diagram illustrating a second embodiment of the present invention for use with a detachable component;

[0020] Figure 5 This is a schematic diagram illustrating a first embodiment of the blocking component according to the present invention;

[0021] Figure 6 This is a schematic diagram illustrating a second embodiment of the blocking component of the present invention.

[0022] 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. Baffle; 41. Barrier net A; 411. Guide plate; 412. Barrier net B; 42. Connecting shaft; 421. Moving plate; 422. Hydraulic cylinder; 43. Nozzle; 431. Spray pipe; 432. Connecting pipe; 44. Sleeve; 441. Gear; 442. Torsion spring; 443. Rack. Detailed Implementation

[0023] 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.

[0024] This invention discloses a coal preparation flotation device, 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.

[0025] It also includes a blocking component, which is set in the flotation cell 1. The blocking component includes several baffles 4 set in the flotation cell 1. The inner wall of the baffles 4 is provided with a blocking mesh A41. The blocking mesh A41 is made of materials such as stainless steel mesh or aluminum alloy woven mesh, and the gap is set to be larger than the outer diameter of a general bubble, so as to filter general bubbles but block the passage of larger bubbles. The surface of the flotation cell 1 has through holes, and a moving plate 421 slides through the through holes. The moving plate 421 is connected to the baffles 4 through a connecting shaft 42. The flotation cell 1 is connected to the moving plate 421 through a hydraulic cylinder 422. The hydraulic cylinder 422 is fixed on the surface of the flotation cell 1, and its output end is fixedly connected to the surface of the moving plate 421. Through the output of the hydraulic cylinder 422, the moving plate 421 is driven to move upward. It also includes a detachment component for separating the bubbles attached to the surface of the blocking mesh A41.

[0026] Specifically, when a large number of bubbles are generated at the bottom of flotation cell 1, and the clean coal is dispersed in the slurry due to the stirring of the stirring structure, ordinary bubbles can pass through the surface gaps of the barrier mesh A41, then adhere to the clean coal and float to the surface of the slurry. As the scraper structure continuously scrapes them out, the clean coal is separated. However, larger bubbles are blocked by the barrier mesh A41 on the surface of baffle 4, and then adhere to the surface of the barrier mesh A41. They are pressed by the baffle 4 at the bottom of flotation cell 1 for a certain period of time. During this period, a certain amount of larger bubbles will accumulate on the surface of the barrier mesh A41 and continue to adhere to it. After a certain period of time, the coal ash, through the output of the hydraulic cylinder 422, drives the moving plate 421 to move upward. The moving plate 421, through the connecting shaft 42, causes the baffle 4 to move upward synchronously, thereby carrying the larger air bubbles attached to the bottom of the barrier net A41 upward synchronously. Due to the attachment limit of the barrier net A41, the possibility of the air bubbles breaking during the upward movement can be reduced. When the baffle 4 carries the barrier net A41 upward to near the surface of the slurry, the larger air bubbles are detached from the bottom of the barrier net A41 by the detachment component, and the clean coal is carried to float to the surface of the liquid, completing the entire stable transfer process of the air bubbles.

[0027] It is worth noting that a timer can be set to determine the stopping time of the baffle 4 based on the flotation speed, the flow rate of the slurry in the flotation cell 1, the amount of bubbles generated, etc., so as to achieve the optimal retention and accumulation time of larger bubbles. The timer is electrically connected to the hydraulic cylinder 422, and the hydraulic cylinder 422 is output and contracted at regular intervals to complete the process of the larger bubbles moving upward and detaching.

[0028] In one embodiment, such as Figure 3As shown, the detachment assembly includes several nozzles 431 fixedly connected to the inner wall of the flotation cell 1. The number of nozzles 431 is the same as the number of baffles 4. One end of each nozzle 431 is fixedly connected to a nozzle 43. The nozzle 43 is a micro-pressure nozzle, and the pressure of the nozzle 43 should be less than 0.3 MPa. The nozzle 43 is a flat nozzle, used to sweep and spray the barrier mesh A41 on the surface of the baffle 4. In this way, the larger air bubbles on the surface of the barrier mesh A41 are lubricated and detached by the water flow, so that the air bubbles can finally float to the surface. The nozzle 43 is in close contact with the moving plate 421. When the nozzle 43 is in close contact with the moving plate 421, the nozzle 43 cannot spray. However, after the moving plate 421 moves up and is offset from the nozzle 43, the nozzle 43 can spray water in time to sweep and spray the barrier mesh A41 on the surface of the baffle 4 at the bottom of the moving plate 421, so as to detach the larger air bubbles.

[0029] Furthermore, the end of the nozzle 431 away from the nozzle 43 passes through the flotation cell 1 and is fixedly connected to a connecting pipe 432. The connecting pipe 432 is connected to an external water source device. The connecting pipe 432 is used to connect multiple nozzles 431 and to introduce external water into the nozzles 431. The connecting pipe 432 can be connected to an external clean water source device or directly connected to the flotation cell 1. By pumping out part of the slurry in the flotation cell 1, the spray water is made to be consistent with the original water quality, avoiding damage to the foam film due to water quality differences. At the same time, when removing larger bubbles, the fine coal in the slurry can be re-attached to the bubble surface, improving the attachment efficiency.

[0030] In one parallel embodiment, such as Figure 4 As shown, the detachment assembly includes a gear 441, a connecting shaft 42 that passes through a movable plate 421 and is connected to the gear 441, and the connecting shaft 42 is rotatably connected to the surface of the movable plate 421. The inner wall of the flotation tank 1 is provided with a rack 443 that is adapted to the gear 441.

[0031] Specifically, unlike the above-mentioned spray water detachment of bubbles, this embodiment allows the baffle 4 to rotate. During the upward movement of the moving plate 421, the gear 441 meshes with the rack 443, and moves synchronously, driving the gear 441 and the connecting shaft 42 to rotate, thereby driving the baffle 4 and the barrier net A41 to rotate. This causes the baffle 4 to flip synchronously during the upward movement. During this process, some of the larger bubbles that were originally located at the bottom of the barrier net A41 will gradually move to the top of the barrier net A41 due to the flipping, making it easier for them to detach naturally by buoyancy. In addition, after the barrier net A41 moves with the baffle 4 to the slurry surface, the larger bubbles that have not yet completely detached from the barrier net A41 will come into contact with the liquid surface and detach naturally from the surface of the barrier net A41 due to the surface tension of the liquid. This achieves natural detachment without external force, improves the detachment effect, and reduces the bubble breakage rate.

[0032] Furthermore, a sleeve 44 is fitted on the surface of the connecting shaft 42, and a torsion spring 442 is installed inside the sleeve 44. The two ends of the torsion spring 442 are connected to the gear 441 and the moving plate 421 respectively. The two ends of the torsion spring 442 are fixedly connected to the gear 441 and the moving plate 421 respectively. Under the action of the rebound force of the torsion spring 442, the baffle 4 and the connecting shaft 42 will be subjected to an elastic force that keeps them stable and horizontal, so that the baffle 4 can return to the initial position after the gear 441 and the rack 443 are disengaged, thus facilitating the collection of larger air bubbles.

[0033] In one parallel embodiment, such as Figure 5 , Figure 6 As shown, unlike the planar baffle 4 described above, the blocking assembly in this embodiment includes several opposing guide plates 411. Two opposing guide plates 411 are fixedly connected to the surface of the connecting shaft 42. A blocking net B412 is provided inside the guide plate 411. The included angle between the two opposing guide plates 411 is "V" shaped and should be less than 180 degrees. In this way, larger air bubbles attached to the surface of the blocking net B412 will slide down with the tilt angle of the guide plate 411 and concentrate near the center of the connecting shaft 42. This further reduces the blocking rate of larger air bubbles to ordinary air bubbles and makes the subsequent detachment process of larger air bubbles more convenient.

[0034] 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.

[0035] like Figure 1 , Figure 2As 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.

[0036] 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 preparation flotation device, 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 assembly is disposed in the flotation cell (1). The blocking assembly includes several baffles (4) disposed in the flotation cell (1). The inner wall of the baffle (4) is provided with a blocking net A (41). The surface of the flotation cell (1) is provided with a through hole, and a moving plate (421) slides through the through hole. The moving plate (421) is connected to the baffle (4) through a connecting shaft (42). The flotation cell (1) is connected to the moving plate (421) through a hydraulic cylinder (422). The assembly also includes a detachment assembly for separating the bubbles attached to the surface of the blocking net A (41).

2. The coal preparation flotation device according to claim 1, characterized in that: The detachment assembly includes several nozzles (431) fixedly connected to the inner wall of the flotation cell (1). One end of each nozzle (431) is fixedly connected to a nozzle (43), and the nozzle (43) is in close contact with the moving plate (421).

3. The coal preparation flotation device according to claim 2, characterized in that: The end of the nozzle (431) away from the nozzle (43) passes through the flotation cell (1) and is fixedly connected to a connecting pipe (432), which is connected to an external water source device.

4. The coal preparation flotation device according to claim 1, characterized in that: The detachment assembly includes a gear (441), the connecting shaft (42) passes through the moving plate (421) and is connected to the gear (441), and the connecting shaft (42) is rotatably connected to the surface of the moving plate (421). The inner wall of the flotation tank (1) is provided with a rack (443) adapted to the gear (441).

5. The coal preparation flotation device according to claim 4, characterized in that: The connecting shaft (42) is fitted with a sleeve (44), and a torsion spring (442) is provided inside the sleeve (44). The two ends of the torsion spring (442) are connected to the gear (441) and the moving plate (421) respectively.

6. The coal preparation flotation device according to claim 1, characterized in that: The blocking assembly includes several oppositely arranged guide plates (411), and two opposite guide plates (411) are fixedly connected to the surface of the connecting shaft (42). A blocking net B (412) is provided inside the guide plate (411), and the included angle between the two opposite guide plates (411) is "V".

7. 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).

8. The 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).

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