Mining coal slime flotation device

Abstract

The invention relates to the technical field of coal slime flotation, and discloses a mining coal slime flotation device which comprises a flotation tank body, a stirring inflation mechanism, a foam tank body and a liquid level controller, and further comprises an opening formed in the outer portion of the flotation tank body. The adjusting weir mechanism comprises a hinged overflow weir, a bottom waterproof folding bag and two pieces of side waterproof folding cloth are connected between the overflow weir and the opening in a sealed mode, and adjusting hydraulic rods are symmetrically arranged outside the overflow weir; the connecting frame body is arranged outside the flotation tank body and is used for mounting the liquid level controller; and the self-adaptive bubble scraping mechanism is arranged outside the flotation tank body and is used for scraping a bubble layer. The angle of the overflow weir is adjusted through the adjusting hydraulic rod, the liquid level controller can be driven to synchronously ascend and descend through the connecting frame body, the top height of the overflow weir and the vertical height of the liquid level controller can synchronously change, and the ore pulp liquid level height needing to be maintained in the flotation tank body can be adjusted according to the ore pulp concentration without changing critical parameters of the liquid level controller.

Description

Technical Field

[0001] This invention relates to the field of coal slime flotation technology, and more specifically, to a coal slime flotation device for mining. Background Technology

[0002] The fundamental principle of coal slime flotation is that hydrophobic coal particles adhere to air bubbles, while hydrophilic gangue particles remain in the coal slurry, thus achieving separation. Coal slime flotation devices can be classified into mechanical flotation devices and air flotation devices according to their structure. Mechanical flotation devices can cover the vast majority of mineral separation scenarios.

[0003] Existing mechanical flotation devices mainly include a flotation cell, an agitation and aeration mechanism, a bubble scraping mechanism, a froth tank, and a liquid level controller. After the flotation reagents and slurry are injected into the flotation cell through the slurry inlet pipe, the agitation and aeration mechanism agitates the slurry and generates a bubble cluster. The bubble cluster fully contacts the target mineral particles in the slurry and floats to form a bubble layer. The bubble scraping mechanism scrapes the bubble layer into the froth tank to form a froth product (clean coal). The slurry that is not floated (tailings) is discharged through the tailings pipe on the flotation cell.

[0004] While the aforementioned mechanical flotation device can maintain the pulp level in the flotation cell by adjusting the inlet flow rate and tailings discharge rate through a liquid level controller, in actual operation, different batches of pulp entering the flotation cell will have different concentrations. Different pulp concentrations require different liquid levels to match. When the pulp concentration is high, the pulp level needs to be appropriately increased to ensure sufficient thickness and stability of the bubble layer. Conversely, when the pulp concentration is low, the pulp level can be appropriately decreased to prevent the bubble layer from becoming too thick and causing foam to burst. However, adjusting the liquid level in the flotation cell by changing the threshold value of the liquid level controller may lead to mismatch between parameters. For example, the parameters of the inlet flow rate and the tailings discharge rate may not be coordinated, making it difficult to ensure that the liquid level can be adjusted to a reasonable position each time, thus reducing flotation efficiency. Summary of the Invention

[0005] This invention provides a coal slime flotation device for mining, which solves the technical problem in related technologies that may lead to mismatch between parameters when adjusting the liquid level height to be maintained in the flotation cell by changing the critical value of the liquid level controller.

[0006] This invention provides a coal slime flotation device for mining, including a flotation cell, a stirring and aeration mechanism, a foam tank, and a liquid level controller. It also includes an opening outside the flotation cell; an adjusting weir mechanism outside the opening, comprising an overflow weir hinged to the outside of the opening, with a bottom waterproof pleated pocket and two side waterproof pleated cloths sealingly connected between the overflow weir and the opening; the bottom waterproof pleated pocket is sealed to both sides of the two side waterproof pleated cloths; and adjusting hydraulic rods are symmetrically arranged outside the overflow weir; a connecting frame outside the flotation cell for mounting the liquid level controller; and an adaptive bubble scraping mechanism outside the flotation cell for scraping off the bubble layer.

[0007] Preferably, the stirring and aeration mechanism is installed in the middle of the flotation cell, and the foam tank is fixed to the outside of the flotation cell by multiple reinforcing ribs.

[0008] Preferably, both sides of the overflow weir are fixedly connected to fan-shaped limiting plates, the bottom waterproof pleats are fitted to the bottom of the opening, the two side waterproof pleats are fitted to the inner side of the corresponding fan-shaped limiting plates, and the two ends of the adjusting hydraulic rod are respectively hinged to the outside of the overflow weir and the foam tank.

[0009] Preferably, the internal space of the flotation cell is the main slurry tank, and the space between the overflow weir, the bottom waterproof pleated hood, and the two side waterproof pleated hoods is the auxiliary slurry tank, and the main slurry tank and the auxiliary slurry tank are connected.

[0010] Preferably, a telescopic discharge plate is provided between the overflow weir and the foam tank, and the two ends of the telescopic discharge plate are respectively hinged to the top side of the overflow weir and the foam tank.

[0011] Preferably, both sides of the overflow weir are fixedly connected to connecting shafts, and both connecting shafts are rotatably connected to abutment rollers.

[0012] Preferably, the connecting frame includes a counterweight block that slides symmetrically on the outside of the flotation tank. The bottom of the counterweight block contacts the corresponding abutment roller. A U-shaped connecting frame is fixedly connected to the outside of the counterweight block. An mounting plate is fixedly connected between the symmetrical U-shaped connecting frames. The liquid level controller is installed in the middle of the mounting plate.

[0013] Preferably, vertical grooves are provided on both sides of the flotation cell, and a limiting block that is fixedly connected to the corresponding counterweight block is slidably connected inside the vertical groove.

[0014] Preferably, the adaptive scraping mechanism includes a drive group installed above the flotation cell. The output end of the drive group is fixedly connected to a rotating shaft. An adaptive scraper group is equidistantly arranged outside the rotating shaft. The adaptive scraper group includes telescopic rods fixedly connected to both ends of the rotating shaft. The output ends of the two telescopic rods are provided with abutting balls. A scraping plate is fixedly connected to the outside of the output shafts of the two telescopic rods.

[0015] The beneficial effects of this invention are as follows:

[0016] 1. This invention employs a combination of an adjusting weir mechanism and a connecting frame. By adjusting the overflow weir angle using a hydraulic rod, the top height of the overflow weir can be changed. Simultaneously, the connecting frame can drive the liquid level controller to rise and fall synchronously, allowing the top height of the overflow weir to change in sync with the vertical height of the liquid level controller. This eliminates the need to change the critical parameters of the liquid level controller (frequent changes to the critical values ​​of the liquid level controller can lead to mismatches between parameters, such as inconsistencies between the liquid inlet flow rate and the tailings discharge rate). The required slurry level height in the flotation cell can be adjusted according to the slurry concentration.

[0017] 2. This invention employs a combination of an overflow weir and an adaptive bubble scraping mechanism. The drive unit drives the rotating shaft to rotate slowly, causing the slowly rotating shaft to drive the adaptive scraper to rotate and enter the bubble layer and contact the overflow weir. This allows the telescopic rod to abut against the overflow weir through the abutment ball, so that the bubble scraper can fit against the overflow weir to scrape off the bubble layer. In other words, the bubble scraper can adapt to changes in the height of the slurry liquid level to perform the work of scraping off the bubble layer.

[0018] 3. The present invention adopts a technical means of combining an overflow weir and a telescopic feeding plate. The bubble layer (clean coal) scraped off by the bubble scraper can smoothly enter the interior of the foam tank through the telescopic feeding plate, avoiding the bubble layer from falling directly into the overflow weir and causing clean coal to splash. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the cross-sectional structure of the present invention;

[0021] Figure 3 for Figure 2 Enlarged view of the structure at point A in the image;

[0022] Figure 4 This is a schematic diagram of the first part of the structure of the present invention;

[0023] Figure 5 This is a schematic diagram of the second part of the structure of the present invention;

[0024] Figure 6This is a schematic diagram of the third part of the present invention.

[0025] In the diagram: 10. Flotation tank; 20. Agitation and aeration mechanism; 30. Foam tank; 40. Liquid level controller; 50. Opening; 60. Regulating weir mechanism; 61. Overflow weir; 62. Bottom waterproof pleated pocket; 63. Side waterproof pleated cloth; 64. Adjusting hydraulic rod; 65. Fan-shaped limiting plate; 66. Abutting roller; 70. Connecting frame; 71. Counterweight block; 72. U-shaped connecting frame; 73. Mounting plate; 80. Adaptive foam scraping mechanism; 81. Rotating shaft; 82. Telescopic rod; 83. Abutting ball; 84. Foam scraping plate; 90. Telescopic discharge plate. Detailed Implementation

[0026] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, some features described in the examples may be combined in other examples.

[0027] like Figure 1 - Figure 3 As shown, this embodiment provides a coal slime flotation device for mining, including a flotation cell 10, a stirring and aeration mechanism 20, a foam tank 30, and a liquid level controller 40. The flotation cell 10 is provided with a slurry inlet pipe and a tailings pipe on its exterior. The stirring and aeration mechanism 20 is installed in the middle of the flotation cell 10. The foam tank 30 is fixed to the exterior of the flotation cell 10 by multiple reinforcing ribs. The specific structure and working principle of the stirring and aeration mechanism 20 and the liquid level controller 40, as well as how the liquid level controller 40 adjusts the slurry inlet flow rate and the tailings discharge rate to maintain the liquid level height in the flotation cell 10, are all existing technologies and will not be described in detail in this embodiment.

[0028] It also includes an opening 50, located outside the flotation cell 10; an regulating weir mechanism 60, located outside the opening 50; a connecting frame 70, located outside the flotation cell 10 and used to install the liquid level controller 40. During the adjustment process, the regulating weir mechanism 60 can drive the liquid level controller 40 to rise and fall synchronously through the connecting frame 70, so as to adjust the height of the slurry liquid level that needs to be maintained without changing the critical parameters of the liquid level controller 40 (frequent changes to the critical values ​​of the liquid level controller 40 may lead to matching deviations between parameters, such as the parameters of the liquid inlet flow rate and the tailings discharge rate not being coordinated), reducing the failure of the liquid level controller 40 due to parameter changes; and an adaptive bubble scraping mechanism 80, located outside the flotation cell 10 and used to scrape off the bubble layer. The adaptive bubble scraping mechanism 80 can adapt to the height of the slurry liquid level that needs to be maintained to scrape off the floating bubble layer (clean coal).

[0029] Among them, such as Figure 4 As shown, the regulating weir mechanism 60 includes an overflow weir 61 hinged to the outside of the opening 50. Both sides of the overflow weir 61 are fixedly connected to fan-shaped limiting plates 65. A bottom waterproof pleated pocket 62 and two side waterproof pleated cloths 63 are sealed between the overflow weir 61 and the opening 50. The bottom waterproof pleated pocket 62 is sealed to the two side waterproof pleated cloths 63 on both sides. The bottom waterproof pleated pocket 62 is fitted against the bottom of the opening 50, and the two side waterproof pleated cloths 63 are fitted against the inner side of the corresponding fan-shaped limiting plates 65 to prevent the bottom waterproof pleated pocket 62 and the two side waterproof pleated cloths 63 from protruding outwards when the slurry enters the auxiliary slurry tank below. This affects the regularity of the floating bubble layer. The bottom waterproof fold 62 and the two side waterproof folds 63 are made of polyvinyl chloride (PVC), which has strong waterproof performance. The overflow weir 61 is symmetrically provided with adjusting hydraulic rods 64. The two ends of the adjusting hydraulic rods 64 are respectively hinged to the outside of the overflow weir 61 and the foam tank 30. By adjusting the hydraulic rods 64, the angle of the overflow weir 61 can be adjusted, thereby changing the top height of the overflow weir 61. Both sides of the overflow weir 61 are fixedly connected to connecting shafts. Both connecting shafts are rotatably connected to the outside of the two connecting shafts. The abutment rollers 66 can follow the movement of the overflow weir 61.

[0030] The internal space of the flotation cell 10 is the main slurry tank, and the space between the overflow weir 61, the bottom waterproof pleated 62, and the two side waterproof pleated cloths 63 is the auxiliary slurry tank. The main slurry tank and the auxiliary slurry tank are connected to form a total slurry tank that can hold slurry.

[0031] A telescopic discharge plate 90 is provided between the overflow weir 61 and the foam tank 30. The two ends of the telescopic discharge plate 90 are respectively hinged to the top side of the overflow weir 61 and the top side of the foam tank 30. The bubble layer scraped off by the adaptive bubble scraping mechanism 80 can smoothly enter the interior of the foam tank 30 through the telescopic discharge plate 90, avoiding the bubble layer from falling directly into the overflow weir 61 and causing clean coal to splash.

[0032] Among them, such as Figure 5As shown, the connecting frame 70 includes a counterweight block 71 that slides symmetrically on the outside of the flotation tank 10. Vertical grooves are provided on both sides of the flotation tank 10. A limiting block that is fixedly connected to the corresponding counterweight block 71 is slidably connected inside the vertical groove. That is, the counterweight block 71 can slide up and down in the vertical direction. The bottom of the counterweight block 71 contacts the corresponding abutting roller 66. When the abutting roller 66 rotates inward with the overflow weir 61, it can abut against the counterweight block 71 and move upward. When the abutting roller 66 rotates outward with the overflow weir 61, the counterweight block 71 will move downward due to its own weight. A U-shaped connecting frame 72 is fixedly connected to the outside of the counterweight block 71. A mounting plate 73 is fixedly connected between the symmetrical U-shaped connecting frames 72. The liquid level controller 40 is installed in the middle of the mounting plate 73. The counterweight block 71 can drive the liquid level controller 40 to move up and down through the U-shaped connecting frame 72 and the mounting plate 73.

[0033] When the angle of the overflow weir 61 is adjusted by adjusting the hydraulic rod 64 to change the top height of the overflow weir 61, the liquid level controller 40 can be moved up and down synchronously, so that the top height of the overflow weir 61 and the vertical height of the liquid level controller 40 change synchronously. The height of the slurry liquid level that needs to be maintained can be adjusted without changing the critical parameters of the liquid level controller 40.

[0034] In addition, such as Figure 6 As shown, the adaptive scraping mechanism 80 includes a drive group installed above the flotation cell 10. The drive group is prior art and will not be described in detail in this embodiment. The output shaft of the drive group rotates slowly. A rotating shaft 81 is fixedly connected to the output end of the drive group. An adaptive scraper group is equidistantly arranged outside the rotating shaft 81. The adaptive scraper group includes telescopic rods 82 fixedly connected to both ends of the rotating shaft 81. The output ends of the two telescopic rods 82 are provided with abutment balls 83. A scraping plate 84 is fixedly connected to the outside of the output shafts of the two telescopic rods 82. During the rotation of the adaptive scraper following the rotating shaft 81, the telescopic rods 82 can abut against the overflow weir 61 through the abutment balls 83, so that the scraping plate 84 can fit against the overflow weir 61 to scrape off the bubble layer (clean coal).

[0035] The specific working principle of this implementation is as follows: Figure 1 As shown, after the flotation reagent and slurry (coal slime and water are uniformly mixed) are injected into the flotation cell 10 through the slurry inlet pipe, the slurry is stirred by the stirring and aeration mechanism 20, and a fine and uniform bubble group is generated. The bubble group fully contacts the target mineral particles in the slurry and floats to form a bubble layer. Then, the bubble layer (clean coal) is scraped into the foam tank 30 by the adaptive bubble scraping mechanism 80. The slurry (tailings) that is not floated is discharged through the tailings pipe on the flotation cell 10. During this process, the liquid level in the flotation cell 10 is maintained by the liquid level controller 40.

[0036] When different batches of pulp have different concentrations entering the flotation cell 10, different liquid levels are required to adapt. When the pulp concentration is high, the collision frequency between mineral particles increases, which is conducive to the adhesion of bubbles and mineral particles. Mineral particles need to adhere to the bubbles to form a bubble layer. A fully accumulated bubble layer can provide sufficient space and time. That is, when the pulp concentration is high, the bubble layer needs to be fully accumulated to improve the flotation recovery rate. Conversely, when the pulp concentration is low, the collision frequency between mineral particles will decrease, the adhesion probability of bubbles and mineral particles will decrease, the bubble layer will be relatively thin and the bubbles will be large. If the bubble layer is too thick, it will break, causing the mineral particles attached to the bubbles to fall back into the pulp. That is, when the pulp concentration is low, it is necessary to prevent the bubble layer from being too thick and causing the bubbles to break, so as not to affect the flotation recovery rate.

[0037] When the slurry level in the flotation cell 10 needs to be raised, the two adjusting hydraulic rods 64 are extended, causing the overflow weir 61 to deflect inward. The bottom waterproof pleats 62 and the two side waterproof pleats 63 retract inward. The top height of the inwardly deflected overflow weir 61 will increase, and it will drive the abutment rollers 66 on both sides to deflect upward. The upwardly deflected abutment rollers 66 will abut against the counterweight block 71 and move upward, so that the counterweight block 71 can drive the mounting plate 73 and the liquid level controller 40 to move upward through the U-shaped connecting frame 72. That is, in the process of adjusting the angle of the overflow weir 61 to increase its top height (the higher the top height of the overflow weir 61, the closer it is to the bubble layer, making it easier for the bubble layer to be discharged), the liquid level controller 40 can be driven to rise synchronously through the connecting frame 70.

[0038] Similarly, when the slurry level in the flotation cell 10 needs to be lowered, the two adjusting hydraulic rods 64 are shortened, causing the overflow weir 61 to deflect outward. The height of the top of the outward-deflecting overflow weir 61 will decrease, and the counterweight block 71 will move the liquid level controller 40 downward due to its own weight. That is, in the process of adjusting the angle of the overflow weir 61 to lower its top height (similarly, the lowering of the top height of the overflow weir 61 brings it closer to the bubble layer, making it easier for the bubble layer to be discharged), the liquid level controller 40 can be lowered synchronously through the connecting frame 70.

[0039] In summary, when adjusting the required pulp level in the flotation cell 10 according to the pulp concentration, the angle of the overflow weir 61 can be adjusted by adjusting the hydraulic rod 64 to change the top height of the overflow weir 61. At the same time, the liquid level controller 40 can be raised and lowered synchronously by the connecting frame 70, so that the top height of the overflow weir 61 can change synchronously with the vertical height of the liquid level controller 40. The required pulp level in the flotation cell 10 can be adjusted without changing the critical parameters of the liquid level controller 40 (frequent changes to the critical values ​​of the liquid level controller 40 may lead to matching deviations between parameters, such as the parameters of the pulp inlet flow rate and the tailings discharge rate not being coordinated).

[0040] During the above operation, the bubble layer (clean coal) in the flotation cell 10 is discharged by the activated adaptive bubble scraping mechanism 80. The activated drive group drives the rotating shaft 81 to rotate slowly. The slowly rotating rotating shaft 81 drives the adaptive scraper to rotate into the bubble layer and contact the overflow weir 61, so that the telescopic rod 82 can abut against the overflow weir 61 through the abutting ball 83, so that the bubble scraping plate 84 can fit against the overflow weir 61 to scrape off the bubble layer. That is, the bubble scraping plate 84 can adapt to the height change of the slurry liquid level and carry out the work of scraping off the bubble layer.

[0041] During the above operation, the bubble layer (clean coal) scraped off by the bubble scraper 84 can smoothly enter the foam tank 30 through the telescopic feed plate 90, avoiding the bubble layer from falling directly into the overflow weir 61 and causing clean coal to splash.

[0042] The embodiments of the present invention have been described above, but the embodiments are not limited to the specific implementation methods described above. The specific implementation methods described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the embodiments described above, all of which are within the protection scope of the embodiments described above.

Claims

1. A coal slime flotation device for mining, comprising a flotation tank (10), a stirring and aeration mechanism (20), a foam tank (30), and a liquid level controller (40), characterized in that, Also includes: An opening (50) is formed on the outside of the flotation cell body (10); An adjusting weir mechanism (60) is provided outside the opening (50). The adjusting weir mechanism (60) includes an overflow weir (61) hinged to the outside of the opening (50). A bottom waterproof folding pocket (62) and two side waterproof folding cloths (63) are sealed between the overflow weir (61) and the opening (50). The two sides of the bottom waterproof folding pocket (62) are respectively sealed to the two side waterproof folding cloths (63). Adjusting hydraulic rods (64) are symmetrically arranged outside the overflow weir (61). A connecting frame (70) is disposed outside the flotation tank (10) and is used to install a liquid level controller (40); An adaptive bubble scraping mechanism (80) is disposed outside the flotation tank (10) and is used to scrape off the bubble layer.

2. The coal slime flotation device for mining according to claim 1, characterized in that, The stirring and aeration mechanism (20) is installed in the middle of the flotation tank (10), and the foam tank (30) is fixed to the outside of the flotation tank (10) by multiple reinforcing ribs.

3. A coal slime flotation device for mining according to claim 2, characterized in that, Both sides of the overflow weir (61) are fixedly connected to fan-shaped limiting plates (65), the bottom waterproof folding pocket (62) is attached to the bottom of the opening (50), the two side waterproof folding cloths (63) are attached to the inner side of the corresponding fan-shaped limiting plates (65), and the two ends of the adjusting hydraulic rod (64) are respectively hinged to the outside of the overflow weir (61) and the foam tank (30).

4. A coal slime flotation device for mining according to claim 3, characterized in that, The internal space of the flotation cell (10) is the main slurry tank, and the space between the overflow weir (61), the bottom waterproof pleated bag (62), and the two side waterproof pleated cloths (63) is the auxiliary slurry tank. The main slurry tank and the auxiliary slurry tank are connected.

5. A coal slime flotation device for mining according to claim 4, characterized in that, A telescopic discharge plate (90) is provided between the overflow weir (61) and the foam tank (30), and the two ends of the telescopic discharge plate (90) are respectively hinged to the top side of the overflow weir (61) and the foam tank (30).

6. A coal slime flotation device for mining according to claim 5, characterized in that, Both sides of the overflow weir (61) are fixedly connected to connecting shafts, and both connecting shafts are rotatably connected to abutment rollers (66).

7. A coal slime flotation device for mining according to claim 6, characterized in that, The connecting frame (70) includes a counterweight block (71) that slides symmetrically on the outside of the flotation tank (10). The bottom of the counterweight block (71) is in contact with the corresponding abutment roller (66). A U-shaped connecting frame (72) is fixedly connected to the outside of the counterweight block (71). A mounting plate (73) is fixedly connected between the symmetrical U-shaped connecting frames (72). The liquid level controller (40) is installed in the middle of the mounting plate (73).

8. A coal slime flotation device for mining according to claim 7, characterized in that, Vertical grooves are provided on both sides of the flotation tank (10), and a limiting block that is fixedly connected to the corresponding counterweight block (71) is slidably connected inside the vertical groove.

9. A coal slime flotation device for mining according to claim 8, characterized in that, The adaptive scraping mechanism (80) includes a drive group installed above the flotation tank (10). The output end of the drive group is fixedly connected to a rotating shaft (81). An adaptive scraper group is equidistantly arranged outside the rotating shaft (81). The adaptive scraper group includes telescopic rods (82) fixedly connected to both ends of the rotating shaft (81). The output ends of the two telescopic rods (82) are provided with abutting balls (83). The output shafts of the two telescopic rods (82) are jointly fixedly connected to a scraping plate (84).

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