Groove type flotation device suitable for long-side arrangement of underground roadway and coal dressing method

Abstract

The invention relates to a groove type flotation device suitable for underground roadway long-side arrangement and a coal preparation method, belongs to the technical field of underground coal separation and recovery, and solves the problems that in the prior art, the underground coal preparation coarse-grain coal gangue separation effect is poor, and the underground space is limited, so that equipment arrangement is difficult. The flotation device comprises a flotation tank, a pulp mixing unit, a water supply unit and a gas supply unit, the pulp mixing unit is used for providing ore pulp for the flotation tank, the water supply unit is used for providing water for the flotation tank, and the gas supply unit is used for providing gas for the flotation tank; the flotation tank comprises a tank body and a water distribution plate, the tank body is of a cuboid structure, and the water distribution plate is arranged in the tank body and obliquely arranged. According to the method, the separation efficiency and the flotation effect of coarse particles are improved, the method can better adapt to specific distribution of underground roadway space, and a reliable solution is provided for tailing treatment in a complex working condition environment.

Description

Technical Field

[0001] The invention relates to the technical field of underground coal sorting and recovery, and in particular to a trough flotation device and a coal preparation method suitable for being arranged on the long side of an underground tunnel. Background Art

[0002] With the increasing requirements for national energy transformation and sustainable development, the development and utilization of coal as an important energy source faces new challenges. Improving the efficiency of coal resource sorting and recovery is of great significance to ensuring national energy security and promoting sustainable economic development. However, in recent years, with the increasing scarcity of high-quality resources, the low quality of newly mined ore has intensified, and the content of gangue has increased. In the traditional on-site sorting process, a large amount of gangue is lifted to the ground, which brings high useless energy consumption and increases corporate costs. In addition, the accumulation of gangue on the surface will cause environmental pollution and safety hazards. Based on the concept of resource conservation and environmentally friendly green mining, it has become an important task to develop underground pre-waste disposal technology, promote on-site filling of gangue, and realize the integration of underground coal mining, selection and filling.

[0003] In the current coal mining industry, traditional flotation technology is mostly used for the treatment of fine-grained materials (mineral particles with a diameter of 0.074-0.5mm), but in the actual operating environment of underground coal mines, facing coarse-grained (mineral particles with a diameter of more than 0.5mm) coal gangue, flotation equipment often fails to play its due sorting effect. In addition, the design and layout of underground long tunnels usually follow the principles of efficiency, safety and economy, but the installation and operation of traditional flotation devices are restricted due to the small space and complex operating environment. A new type of equipment is urgently needed to solve these problems. In recent years, with the continuous advancement of mining technology, fluidized flotation technology has gradually received attention. This technology improves the efficiency of mineral sorting by enhancing the interaction between bubbles and particles, especially showing good prospects when processing coarse-grained ores. However, the application of existing fluidized equipment in underground environments is still insufficient. Most designs do not take into account the specific space requirements of the tunnel, resulting in bulky equipment and inconvenient operation. For mines with scarce water resources, this undoubtedly increases the difficulty of implementation.

[0004] In view of this, in response to the above technical limitations, the present invention aims to develop a trough-type coarse-particle fluidized flotation device specifically suitable for the long side arrangement of underground tunnels, in order to achieve pre-disposal and on-site filling of underground tunnels, and promote the integration of underground coal mining, selection and filling. Summary of the invention

[0005] In view of the above analysis, the embodiments of the present invention aim to provide a trough flotation device and a coal preparation method suitable for long side arrangement in underground tunnels, so as to solve the problems of poor coarse gangue separation effect in existing underground coal preparation and difficulty in equipment arrangement due to limited underground space.

[0006] On the one hand, the present invention provides a trough flotation device suitable for long-side arrangement in an underground tunnel, comprising a flotation trough, a slurry adjusting unit, a water supply unit and a gas supply unit, wherein the slurry adjusting unit is used to provide slurry to the flotation trough, the water supply unit is used to provide water to the flotation trough, and the gas supply unit is used to provide gas to the flotation trough;

[0007] The flotation tank comprises a tank body and a water distribution plate. The tank body is a rectangular parallelepiped structure. The water distribution plate is arranged in the tank body and is inclined.

[0008] Furthermore, the flotation cell also includes an overflow weir, a water recovery tank and a dewatering screen, wherein the overflow weir is arranged on the top of the cell body, and the water recovery tank and the dewatering screen are both arranged on the outside of the cell body.

[0009] Furthermore, the water recovery tank and the dewatering screen are both located below the overflow weir, and the dewatering screen is arranged above the water recovery tank.

[0010] Furthermore, the flotation tank further comprises an inclined material distribution pipe and a grid baffle, wherein the grid baffle is arranged in the tank body and is located above the inclined material distribution pipe.

[0011] Furthermore, it also includes a Venturi tube, which is arranged inside the trough body and below the water distribution plate.

[0012] Furthermore, the slurry mixing unit includes a slurry mixing barrel and a slurry delivery pipe, and the slurry delivery pipe is connected to the slurry mixing barrel and is connected to the inclined material distribution pipe.

[0013] Furthermore, the slurry mixing unit also includes a slurry pump, and the slurry pump is connected to the slurry delivery pipe.

[0014] Furthermore, the water supply unit includes a water tank, a first centrifugal pump and a water pipe, the water tank and the Venturi tube are connected through the water pipe, and the first centrifugal pump is connected to the water pipe.

[0015] Furthermore, the air supply unit includes an air pump, a valve and an air pipe, the valve is arranged on the air pipe, one end of the air pipe is connected to the air pump, and the other end of the air pipe is connected to the venturi tube.

[0016] On the other hand, the present invention provides an underground coal preparation method, which is used for coal preparation operations using the above-mentioned trough flotation device suitable for arrangement on the long side of an underground tunnel.

[0017] Compared with the prior art, the present invention can at least achieve the following beneficial effects:

[0018] (1) The water distribution plate of the present invention includes a first water distribution part, a second water distribution part and a third water distribution part which are connected in sequence. The angles between the first water distribution part, the second water distribution part and the third water distribution part and the horizontal plane are 10°, 20° and 30° respectively. The three-level inclination structure of the water distribution plate ensures that the material slides evenly with "equal thickness" on the surface of the water distribution plate, effectively avoiding problems such as material accumulation and blockage. In addition, the water distribution plate with a three-level inclination structure cooperates with intermittent dynamic water supply to further improve the speed and efficiency of tailings treatment while reducing energy consumption, so that the tailings can be discharged evenly, stably and efficiently from the side of the trough body, effectively reducing the vertical height of the equipment, better adapting to the specific distribution of the underground tunnel space, and providing a reliable solution for tailings treatment under complex working conditions.

[0019] (2) The inclined material distribution pipe of the present invention adopts built-in pressure sensing to control feeding. Feeding ports are evenly arranged on both sides along the length direction of the inclined material distribution pipe. The opening size of the feeding port is controlled by a PID controller. A pressure sensing controller is arranged at the feeding port. The pressure sensing controller monitors the fluid pressure changes of each feeding port in real time. The PID controller adjusts the opening size of the feeding port through the pressure signal given by the pressure sensing controller, so as to realize small openings in high-pressure areas and large openings in low-pressure areas, so as to ensure uniform distribution of the slurry in the tank body. Compared with the traditional material distribution disc design, this feeding method realizes uniform feeding while effectively reducing the height pressure of the equipment, and is suitable for limited space operations underground.

[0020] (3) The present invention effectively alleviates the interference of the horizontal flow caused by the narrow and long structure of the tank body on the fluidized environment by arranging a grid baffle in the tank body. The introduction of the grid baffle significantly improves the collision and adhesion conditions between bubbles and particles, reduces the probability of hydrophobic particles desorbing due to flow field turbulence, and thus improves the sorting efficiency and flotation effect of coarse particles. In addition, the grid baffle significantly reduces the energy loss caused by the horizontal flow and reduces the risk of equipment wear by optimizing the flow field stability inside the tank body, providing a reliable guarantee for achieving efficient, energy-saving and stable coarse particle flotation.

[0021] (4) The present invention adopts an intelligent water circulation system, an efficient combination design of an overflow weir and a small dewatering screen, which can perform preliminary dehydration of concentrates with high water content. The dehydrated clean coal is lifted to the surface through the transportation system, which greatly reduces the transportation burden of the clean coal; and the water under the screen is monitored in real time by an intelligent diversion controller to monitor the slime content. Part of the water flows into the sedimentation tank, and the other part flows back to the water tank, realizing the efficient recycling of water resources. This method not only ensures the stable operation of the equipment, but also improves the utilization rate of water resources, reduces dependence on external water sources, and provides a more reliable water guarantee for underground operations.

[0022] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by practicing the present invention. The purpose and other advantages of the present invention can be achieved and obtained through the contents particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like components throughout the drawings.

[0024] Figure 1 It is a structural schematic diagram of a trough flotation device of a specific embodiment;

[0025] Figure 2 It is a structural schematic diagram of an inclined material distribution pipe of a specific embodiment;

[0026] Figure 3 It is a schematic structural diagram of a multi-angle water distribution plate of a specific embodiment.

[0027] Reference numerals:

[0028] 1-flotation tank; 11-tank body; 12-overflow weir; 13-water recovery tank; 14-dewatering screen; 15-concentrate port; 16-inclined material distribution pipe; 17-feeding port; 18-pressure sensing controller; 19-grid baffle; 10-water distribution plate; 101-first water distribution part; 102-second water distribution part; 103-third water distribution part; 104-first water distribution hole; 105-second water distribution hole; 106-third water distribution hole; 107-perforated screen; 108-fluid inlet; 109-tailings port; 110-inspection port;

[0029] 2-slurry mixing unit; 21-slurry mixing barrel; 22-slurry pump; 23-slurry delivery pipe; 3-water supply unit; 31-water tank; 32-first centrifugal pump; 33-water delivery pipe; 34-liquid flow meter; 4-air supply unit; 41-air pump; 42-valve; 43-air delivery pipe; 44-gas flow meter; 5-PID controller; 6-Venturi tube; 7-second centrifugal pump; 8-diversion controller. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0031] In order to facilitate the understanding of this embodiment, it should be noted that the long side arrangement in this specific embodiment means that the long side of the equipment is arranged parallel to the long and narrow lane.

[0032] Example 1

[0033] A specific embodiment of the present invention, as Figure 1 As shown, a trough flotation device suitable for long-side arrangement in an underground tunnel is disclosed, comprising a flotation cell 1, a slurry mixing unit 2, a water supply unit 3 and an air supply unit 4. The slurry mixing unit 2 supplies slurry into the flotation cell 1, and the clean water provided by the water supply unit 3 and the gas provided by the air supply unit 4 form bubble water and are supplied to the flotation cell 1.

[0034] like Figure 1 As shown, the flotation cell 1 includes a cell body 11 and an overflow weir 12 . The overflow weir 12 is arranged on the top of the cell body 11 . The concentrate floated out of the cell body 11 floats on the overflow weir 12 and is discharged from the overflow weir 12 .

[0035] Considering the limited working space underground, the tank body 11 is a rectangular parallelepiped structure, and the ratio of the length, width and height of the tank body 11 is 1:1:1 to 2:1:1, preferably 1.5:1:1; in other words, the longitudinal section of the tank body 11 is a square. Since the ratio of the length, width and height of the tank body 11 is 1:1:1 to 2:1:1, tank bodies 11 of different sizes are formed. In actual use, they can be selected according to the characteristics of the underground space, and can be flexibly arranged on the long side of the underground tunnel, effectively utilizing the limited underground space.

[0036] Due to the scarcity of water resources in underground operations, considering the collection of concentrate and water recycling, such as Figure 1 As shown, the flotation tank 1 further includes a water recovery tank 13 and a dewatering screen 14, both of which are arranged outside the tank body 11, and both of which are located below the overflow weir 12. The dewatering screen 14 is arranged above the water recovery tank 13, and the concentrate and water of the overflow weir 12 flow to the water recovery tank 13, the concentrate is dehydrated through the dewatering screen 14, the water under the screen enters the water recovery tank 13 for recycling, and the concentrate on the screen is discharged through the concentrate port 15. It can be understood that the concentrate port 15 is provided at the top of the water recovery tank 13 and below the dewatering screen 14.

[0037] In order to feed the tank 11 evenly, Figure 1 As shown, the flotation tank 1 further includes an inclined material distribution pipe 16, which is disposed in the tank body 11, and is inclined from a height A on one side of the tank body 11 to a height B on the other side of the tank body 11, and the height A is located above the height B. Preferably, the inclined material distribution pipe 16 is approximately located in the middle area of ​​the tank body 11.

[0038] Furthermore, combined with Figure 1 and Figure 2As shown, a plurality of feed ports 17 are provided along the length direction of the inclined feed distribution pipe 16, and the feed ports 17 are provided on both sides of the inclined feed distribution pipe 16. The feed ports 17 distributed on both sides of the inclined feed distribution pipe 16 are symmetrically arranged or staggered. Preferably, the feed ports 17 are symmetrically arranged on both sides of the inclined feed distribution pipe 16.

[0039] In order to further improve the uniformity of feeding, combined with Figure 1 and Figure 2 As shown, the flotation cell 1 also includes a pressure sensing controller 18, which is used to obtain the pressure signal of the feed port 17 and transmit it to the PID controller 5. The pressure sensing controller 18 monitors the fluid pressure changes of each feed port 17 in real time, and automatically adjusts the opening size of the feed port 17 through the PID controller 5 according to the obtained pressure signal.

[0040] In this embodiment, the inclined material distribution pipe 16 adopts built-in pressure sensing to control feeding, and feeding ports 17 are evenly arranged on both sides of the length direction of the inclined material distribution pipe 16. The opening size of the feeding port 17 is controlled by the PID controller 5. A pressure sensing controller 18 is arranged at the feeding port 17. The pressure sensing controller 18 monitors the fluid pressure change of each feeding port 17 in real time. The PID controller 5 adjusts the opening size of the feeding port 17 through the pressure signal given by the pressure sensing controller 18, so as to realize small openings in high-pressure areas and large openings in low-pressure areas, so as to ensure that the slurry is evenly distributed in the tank body 11. Compared with the traditional material distribution disc design, the feeding method of this embodiment realizes uniform feeding while effectively reducing the height pressure of the equipment. In addition, the structure is simple, reduces the equipment failure rate, and reduces the enclosure cost.

[0041] In order to optimize the flow field distribution in the tank 11 and reduce the influence of horizontal flow, Figure 1 As shown, the flotation cell 1 further includes a grid baffle 19 , which is disposed in the cell body 11 and above the inclined material distribution pipe 16 .

[0042] In this embodiment, by setting the grid baffle 19 in the tank body 11, the interference of the horizontal flow caused by the narrow and long structure of the tank body 11 on the fluidized environment is effectively alleviated. The introduction of the grid baffle 19 significantly improves the collision and adhesion conditions between bubbles and particles, reduces the probability of hydrophobic particles desorbing due to flow field turbulence, and thus improves the sorting efficiency and flotation effect of coarse particles. In addition, the grid baffle 19 significantly reduces the energy loss caused by the horizontal flow and reduces the risk of equipment wear by optimizing the flow field stability inside the tank body 11, providing a reliable guarantee for achieving efficient, energy-saving and stable coarse particle flotation.

[0043] like Figure 1 and Figure 3As shown, the flotation tank 1 further includes a water distribution plate 10, which is arranged obliquely in the tank body 11. The water distribution plate 10 includes a first water distribution part 101, a second water distribution part 102 and a third water distribution part 103, which are connected in sequence, the angle between the first water distribution part 101 and the horizontal plane is 10°, the angle between the second water distribution part 102 and the horizontal plane is 20°, the angle between the third water distribution part 103 and the horizontal plane is 30°, and the first water distribution part 101, the second water distribution part 102 and the third water distribution part 103 are arranged in sequence from bottom to top.

[0044] Furthermore, if Figure 3 As shown, the first water distribution part 101, the second water distribution part 102 and the third water distribution part 103 are respectively provided with a first water distribution hole 104, a second water distribution hole 105 and a third water distribution hole 106, the first water distribution hole 104 is evenly arranged on the first water distribution part 101, the second water distribution hole 105 is evenly arranged on the second water distribution part 102, and the third water distribution hole 106 is evenly arranged on the third water distribution part 103. In order to prevent particles from being deposited at the aperture of the water distribution plate 10, the surfaces of the first water distribution hole 104, the second water distribution hole 105 and the third water distribution hole 106 are all provided with a perforated screen 107.

[0045] Considering that the fluid medium is transported into the tank body 11 through the water distribution plate 10, as Figure 1 and Figure 3 As shown, the water distribution plate 10 also includes a fluid inlet portion 108, which is arranged below the first water distribution portion 101, the second water distribution portion 102 and the third water distribution portion 103, and is connected to the inner cavities of the first water distribution portion 101, the second water distribution portion 102 and the third water distribution portion 103. The fluid medium enters the inner cavities of the first water distribution portion 101, the second water distribution portion 102 and the third water distribution portion 103 through the fluid inlet portion 108, and then is discharged through their respective water distribution holes.

[0046] In this embodiment, the water distribution plate 10 adopts a multi-angle coordinated arrangement, that is, the angles between the first water distribution part 101, the second water distribution part 102 and the third water distribution part 103 and the horizontal plane are 10°, 20° and 30° respectively. Compared with the traditional water distribution plate structure, the water distribution plate 10 of this embodiment ensures the fluidization effect while ensuring that the tailings are discharged from the side of the tank body 11 by their own weight, effectively reducing the vertical height of the equipment. Combined with intermittent dynamic water supply, the tailings discharge effect is optimized and the problem of tailings blockage is avoided. The perforated screen 107 on the surface of the water distribution hole can effectively prevent particle deposition, effectively reduce downtime, improve the speed and efficiency of tailings processing, reduce the burden on subsequent processing facilities, and improve overall production energy.

[0047] Considering the discharge of tailings, Figure 1As shown, the tank body 11 is provided with a tailings port 109, which is arranged on one side of the tank body 11 and above the lowest end of the water distribution plate 10. For example, the tailings port 109 is arranged above the lowest end of the first water distribution part 101. Since the water distribution plate 10 is arranged obliquely in the tank body 11, especially the inclination angle from the third water distribution part 103 and the second water distribution part 102 to the first water distribution part 101 is gradually reduced, combined with the tailings port 109 arranged on the side of the tank body 11, the tailings can be discharged from the side of the tank body 11 by using the dead weight, and the impact force of the tailings on the tailings port 109 can be gradually alleviated. The tailings discharged from the tailings port 109 are filled in situ underground. The underground filling of the tailings reduces the possibility of surface subsidence, protects the balance of the surrounding ecological environment, and is of great significance to the sustainable utilization of resources and the ecological restoration of the mining area.

[0048] Understandably, in order to facilitate equipment maintenance, e.g. Figure 1 As shown, an inspection opening 110 is provided at the lower end of the tank body 11 .

[0049] like Figure 1 As shown, the slurry mixing unit 2 includes a slurry mixing barrel 21, a slurry pump 22 and a slurry delivery pipe 23, one end of the slurry delivery pipe 23 is connected to the slurry mixing barrel 21, the other end is connected to the inlet of the slurry delivery pipe 23, the outlet of the slurry delivery pipe 23 is connected to another slurry delivery pipe 23, and the other end of the slurry delivery pipe 23 is connected to the inclined material distribution pipe 16. The slurry after slurry mixing in the slurry mixing barrel 21 is transported to the inclined material distribution pipe 16 through the slurry delivery pipe 23 under the action of the slurry pump 22, and the slurry is evenly distributed in the tank body 11 through the inclined material distribution pipe 16.

[0050] like Figure 1 As shown, the tank flotation device also includes a venturi tube 6, which is arranged inside the flotation tank 1 and below the water distribution plate 10. The water supply unit 3 includes a water tank 31, a first centrifugal pump 32, a water pipe 33 and a liquid flow meter 34. One end of the water pipe 33 is connected to the water tank 31, and the other end is connected to the inlet of the first centrifugal pump 32. The outlet of the first centrifugal pump 32 is connected to one end of another water pipe 33, and the other end of the other water pipe 33 is connected to the first inlet of the venturi tube 6. The outlet of the venturi tube 6 is connected to the fluid inlet portion 108. The liquid flow meter 34 is arranged on the water pipe 33 to monitor the flow rate of the fluid medium in the water pipe 33. The water in the water tank 31 is pressurized by the first centrifugal pump 32 and then transported to the venturi tube 6 through the water pipe 33.

[0051] It is worth noting that the first centrifugal pump 32 is also controlled by the PID controller 5. The output power of the first centrifugal pump 32 is controlled by adjusting the PID controller 5. The water supply frequency can adopt a sine wave, a square wave or a triangle wave, preferably a sine wave, to achieve efficient fluidization and energy saving effects.

[0052] In this embodiment, the output power of the first centrifugal pump 32 is flexibly adjusted by the PID controller 5, the water supply frequency is flexibly adjusted according to real-time demand, and multiple waveform mode designs such as sine waves are supported. This design not only ensures the stability of the fluidization effect, but also achieves significant energy and water saving effects. By accurately controlling the water flow, water resource waste is reduced, resource utilization efficiency is improved, the economy and sustainability of the operation are ensured, and the development of green mining is promoted.

[0053] In this embodiment, the water distribution plate 10 adopts a three-level inclination structure, which ensures that the material slides evenly on the surface of the water distribution plate 10 with "equal thickness" through clever geometric distribution, effectively avoiding problems such as material accumulation and blockage. In addition, the water distribution plate 10 with a three-level inclination structure cooperates with the dynamic water supply of the first centrifugal pump 32 to further improve the speed and efficiency of tailings treatment while reducing energy consumption. The three-level inclination structure of the water distribution plate 10 works in synergy with the dynamic water supply, so that the tailings can be discharged evenly, stably and efficiently from the side of the trough body 11, effectively reducing the vertical height of the equipment, better adapting to the distribution characteristics of the underground tunnel space, and providing a reliable solution for tailings treatment under complex working conditions.

[0054] like Figure 1 As shown, the air supply unit 4 includes an air pump 41, a valve 42, an air pipe 43 and a gas flow meter 44. One end of the air pipe 43 is connected to the air pump 41, and the other end is connected to the second inlet of the venturi tube 6. The valve 42 and the gas flow meter 44 are both arranged on the air pipe 43.

[0055] In this embodiment, the water delivered by the water tank 31 and the gas delivered by the air pump 41 meet at the venturi tube 6 to form a water-gas mixture, which is then delivered to the inner cavity of the tank body 11 through the water distribution plate 10 .

[0056] Considering the difficulty of using water during underground operations, in order to save water resources, such as Figure 1 As shown, the tank flotation device also includes a second centrifugal pump 7 and a diversion controller 8. The water inlet of the second centrifugal pump 7 is connected to the diversion controller 8 through a pipeline, and the water outlet of the second centrifugal pump 7 is connected to the water tank 31 through a pipeline. The water recovery tank 13 is connected to the diversion controller 8 through a pipeline. The water under the dewatering screen 14 is tested for coal slime content by the diversion controller 8, and is allocated for use according to actual conditions, with a portion of it flowing into the sedimentation tank and the other portion being pressurized by the second centrifugal pump 7 and refluxed to the water tank 31, thereby achieving efficient recycling of water resources.

[0057] This embodiment adopts an intelligent water circulation system, an efficient combination design of an overflow weir 12 and a small dewatering screen 14, and can perform preliminary dehydration of concentrates with high water content. The dehydrated clean coal is lifted to the surface through the transportation system, which greatly reduces the transportation burden of the clean coal; and the water under the screen is monitored in real time by the intelligent diversion controller 8 for the slime content, and flexibly diverted according to actual conditions. Part of the water flows into the sedimentation tank, and the other part flows back to the water tank 31, realizing the efficient recycling of water resources. This intelligent water management system not only ensures the stable operation of the system, but also improves the utilization rate of water resources, reduces dependence on external water sources, and provides more reliable water guarantee for underground operations.

[0058] The present invention adopts a compact trough design, which can be flexibly arranged on the long side of the underground tunnel to make full use of the limited underground space. Compared with the traditional fluidized flotation machine, the bottom water distribution plate 10 of the device adopts "multi-angle coordinated arrangement" to achieve uniform tail discharge on the side, combined with the "inclined pressure-sensitive control feeding in the trough body 11", while ensuring uniform distribution and full fluidization of the slurry, it effectively reduces the vertical height requirement of the equipment and adapts to the spatial distribution characteristics of the long tunnel. The combination of intermittent water supply and the water diversion system under the clean coal screen realizes the efficient recycling of water resources. While ensuring the continuous and stable operation of the system, this design can effectively save water resources and reduce energy consumption, significantly reducing the operating cost of underground operations, further promoting the sustainable use of resources, and improving the overall production capacity and economic benefits of coal mines. In addition, the compact design also facilitates the maintenance and overhaul of the equipment and reduces operating costs.

[0059] Example 2

[0060] Another specific embodiment of the present invention discloses an underground coal preparation method, which uses the trough flotation device suitable for the long side arrangement of the underground tunnel of embodiment 1, and the steps include:

[0061] Step S1: Check pipeline equipment before starting.

[0062] Before starting the equipment, ensure that all safety inspections are in place. First, confirm that the inspection port 110 and the tailing port 109 are closed to ensure that the system is well sealed to prevent leakage or failure during operation. In addition, check the integrity of each connection, valve and pipeline to ensure that all components are in normal operation to ensure stable operation of the equipment after startup.

[0063] Step S2: Dynamic water supply and initial fluidization.

[0064] Open the valve of the water tank 31, and the water flows into the water distribution plate 10 evenly after being pressurized by the first centrifugal pump 32. The output power of the first centrifugal pump 32 is controlled by adjusting the PID controller 5 to realize intermittent dynamic water supply. Synchronously start the air pump 41, and accurately adjust the air flow through the air flow valve 42 combined with the gas flow meter 44, so that the air flow and the water flow form an ideal water-gas mixture in the venturi tube 6. In order to improve the stability of bubble generation and reduce the phenomenon of bubble annexation, a foaming agent can be added to the water tank 31. The foaming agent is selected from octanol, methyl amyl alcohol, and dodecyl trimethyl ammonium bromide, preferably octanol, and the amount is 0.2-2kg / t, preferably 0.5kg / t. After the water-gas mixture reaches the water distribution plate 10 through the pipeline, it is evenly ejected upward from the water distribution hole. The water distribution plate 10 with a three-level inclination structure ensures that the water-gas mixture is evenly distributed in the entire tank body 11.

[0065] Step S3: tilted pressure sensing to control feeding.

[0066] After the fluidization system in the tank body 11 is running stably, the feed valve of the slurry mixing barrel 21 is opened, and the slurry enters the inclined distribution pipe 16 through the slurry pump 22. The inclined distribution pipe 16 is equipped with a pressure sensing controller 18, which is used to monitor the fluid pressure changes of each feeding port 17 in real time. According to the pressure signal obtained, the opening size of the feeding port 17 is automatically adjusted by the PID controller 5 to achieve a small opening in the high-pressure area and a large opening in the low-pressure area to ensure that the slurry is evenly distributed in the tank body 11. After the slurry particles are evenly distributed to the tank body 11, they are fully fluidized under the action of the rising water flow, and the hydrophilic minerals sink and are evenly discharged from the tailings port 109 on the side of the tank body 11 along the surface of the water distribution plate 10, and then filled in situ through the underground transportation system. The hydrophobic minerals adhere to the surface of the bubbles, float to the overflow weir 12 with the bubbles, and are discharged from the concentrate port 15 after being dehydrated by the dewatering screen 14. The dehydrated concentrate is lifted to the ground by the underground transportation system.

[0067] In this step, a built-in pressure sensor is used to control feeding, and feeding ports 17 are evenly arranged along the length direction of the inclined distribution pipe 16. The opening size of the feeding port 17 is controlled by the PID controller 5 to achieve a small opening in the high-pressure area and a large opening in the low-pressure area, so as to ensure that the slurry is evenly distributed in the tank body 11. This feeding method effectively reduces the height pressure of the equipment while achieving uniform feeding, and is suitable for underground coal preparation operations.

[0068] Step S4: Intelligent diversion facilitates water circulation.

[0069] The water under the dewatering screen 14 enters the water recovery tank 13 for storage. The coal slime content of the water under the screen is detected by the intelligent diversion controller 8. Part of the water flows into the sedimentation tank, and the other part is pressurized by the second centrifugal pump 7 and returned to the water tank 31, thereby realizing efficient recycling of water resources.

[0070] In this step, the coal slime content of the screen water after the concentrate is dehydrated is monitored by the intelligent diversion controller 8, and diversion is performed. Part of the water flows back to the water tank 31 for subsequent recycling, and the other part of the water flows into the sedimentation tank. For the coal preparation function of underground water shortage, this method realizes the efficient recycling of water resources, which not only ensures the stable operation of the system, but also improves the utilization rate of water resources, reduces the dependence on external water sources, and provides more reliable water guarantee for underground operations.

[0071] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A trough flotation device suitable for long-side arrangement in underground tunnels, characterized in that: The invention comprises a flotation cell (1), a pulp adjusting unit (2), a water supply unit (3) and a gas supply unit (4), wherein the pulp adjusting unit (2) is used to provide pulp to the flotation cell (1), the water supply unit (3) is used to provide water to the flotation cell (1), and the gas supply unit (4) is used to provide gas to the flotation cell (1); The flotation cell (1) comprises a cell body (11) and a water distribution plate (10); the cell body (11) is a rectangular parallelepiped structure; the water distribution plate (10) is arranged in the cell body (11); and the water distribution plate (10) is arranged obliquely.

2. The trough flotation device suitable for long-side arrangement of underground tunnels according to claim 1, characterized in that: The flotation cell (1) further comprises an overflow weir (12), a water recovery tank (13) and a dewatering screen (14); the overflow weir (12) is arranged at the top of the cell body (11); and the water recovery tank (13) and the dewatering screen (14) are both arranged on the outside of the cell body (11).

3. The trough flotation device suitable for long-side arrangement of underground tunnels according to claim 2, characterized in that: The water recovery tank (13) and the dewatering screen (14) are both located below the overflow weir (12), and the dewatering screen (14) is arranged above the water recovery tank (13).

4. The trough flotation device suitable for long side arrangement in underground tunnels according to any one of claims 1 to 3, characterized in that: The flotation tank (1) further comprises an inclined material distribution pipe (16) and a grid baffle (19); the grid baffle (19) is arranged in the tank body (11) and is located above the inclined material distribution pipe (16).

5. The trough flotation device suitable for long-side arrangement in underground tunnels according to any one of claims 1 to 3, characterized in that: It also includes a Venturi tube (6), which is arranged inside the trough body (11) and below the water distribution plate (10).

6. The trough flotation device suitable for long-side arrangement of underground tunnels according to claim 4, characterized in that: The slurry mixing unit (2) comprises a slurry mixing barrel (21) and a slurry delivery pipe (23); the slurry delivery pipe (23) is in communication with the slurry mixing barrel (21) and is connected to the inclined material distribution pipe (16).

7. The trough flotation device suitable for long-side arrangement of underground tunnels according to claim 6, characterized in that: The slurry adjustment unit (2) further comprises a slurry pump (22), and the slurry pump (22) is connected to the slurry delivery pipe (23).

8. The trough flotation device suitable for long-side arrangement in underground tunnels according to claim 5, characterized in that: The water supply unit (3) comprises a water tank (31), a first centrifugal pump (32) and a water pipe (33); the water tank (31) and the Venturi tube (6) are in communication with each other via the water pipe (33); and the first centrifugal pump (32) is connected to the water pipe (33).

9. The trough flotation device suitable for long-side arrangement in underground tunnels according to claim 5, characterized in that: The air supply unit (4) comprises an air pump (41), a valve (42) and an air delivery pipe (43); the valve (42) is arranged on the air delivery pipe (43); one end of the air delivery pipe (43) is connected to the air pump (41), and the other end is connected to the Venturi tube (6).

10. An underground coal preparation method, characterized in that: The trough flotation device suitable for the long side arrangement of the underground tunnel as described in any one of claims 1 to 9 is used for underground coal preparation operations.

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