Short-edge-arranged coarse grain fluidization flotation device for underground operation and coal dressing method

Abstract

The invention relates to a short-edge-arranged coarse grain fluidization flotation device for underground operation and a coal dressing method, belongs to the technical field of mineral processing and resource recovery, and solves the problems of low separation precision and low efficiency caused by limited separation space of underground coal dressing operation in the prior art. The invention provides a short edge arrangement groove type coarse grain fluidization flotation device suitable for downhole operation, which comprises a flotation unit, a fluidization water unit and an ore pulp unit, the fluidization water unit is used for providing fluidization water, and the ore pulp unit is used for providing ore pulp; the flotation unit comprises a flotation column, the flotation column comprises a flotation column body and a concentrate overflow groove, the concentrate overflow groove is formed in the top of the flotation column body, and an inner cavity of the flotation column body is divided into a first cavity and a second cavity. According to the method, the total coarse-grain mineral flotation efficiency is effectively improved through the three processes of feeding, sorting and discharging, and a foundation is provided for deep quality improvement and efficient utilization of fluidization flotation of low-quality coarse-grain minerals under underground operation.

Description

Technical Field

[0001] The invention relates to the technical field of mineral processing and resource recovery, and in particular to a short-side arranged coarse-grained fluidized flotation device for underground operations and a coal preparation method. Background Art

[0002] As global resource competition becomes increasingly fierce, the efficient development and utilization of coal and mineral resources is of great significance to ensuring national energy security and promoting the development of emerging industries. However, with the decline in ore quality, the increase in mining costs and the complexity of process flow, traditional flotation technology has been unable to meet the stringent standards of modern mineral processing. Reducing energy consumption and emissions in ore dressing plants has become an urgent problem that needs to be solved.

[0003] Coarse-grained fluidized bed column separation technology is gradually becoming a research hotspot due to its significant advantages in reducing energy consumption and promoting tailings resource utilization. Compared with traditional methods that rely on photoelectric separation and gravity separation, the emergence of this technology makes efficient separation of millimeter-level materials a reality, opening up new ways for deep pre-selection of low-grade mineral resources and reuse of waste ores.

[0004] Underground coal preparation technology is a coal sorting process that is carried out directly underground in coal mines. This method allows the immediate processing and sorting of newly mined raw coal at the coal mining site, that is, underground, instead of transporting all the raw coal to the coal preparation plant on the ground for subsequent processing. The main goal of underground coal preparation is to remove impurities such as gangue and silt from coal, thereby improving the quality of coal, while reducing unnecessary material transportation to the ground to reduce costs and alleviate environmental pressure. Despite this, underground coal preparation currently faces some challenges, such as limited sorting space and low sorting accuracy. These problems not only limit the installation and operation flexibility of underground sorting equipment, but also lead to a decrease in sorting efficiency, reduce processing capacity, and affect the maintenance and service life of the equipment. Therefore, it is particularly urgent to develop a short-side layout trough coarse-grained fluidized flotation device suitable for underground operations. Summary of the invention

[0005] In view of the above analysis, the embodiment of the present invention aims to provide a short-side trough-type coarse-grained fluidized flotation device suitable for underground operations, so as to solve the problems of low sorting accuracy and low efficiency caused by limited sorting space in existing underground coal preparation operations.

[0006] On the one hand, the present invention provides a short-side arranged trough type coarse particle fluidized flotation device suitable for underground operation, comprising a flotation unit, a fluidized water unit and a slurry unit, wherein the fluidized water unit is used to provide fluidized water, and the slurry unit is used to provide slurry;

[0007] The flotation unit comprises a flotation column, which comprises a flotation column body and a concentrate overflow tank. The concentrate overflow tank is arranged on the top of the flotation column body, and the inner cavity of the flotation column body is divided into a first chamber and a second chamber.

[0008] Furthermore, a pulp inlet is provided at the upper end of the flotation column, and the pulp inlet is communicated with the inner cavity of the flotation column.

[0009] Furthermore, the flotation unit also includes a feed conveying pipe and an inclined feed pipe arranged in the flotation column.

[0010] Furthermore, one end of the feed conveying pipe is communicated with the slurry feed port, and the other end is communicated with the inclined feed pipe.

[0011] Furthermore, a spiral scraper discharge pipe is provided at the lower end of the flotation column, and the spiral scraper discharge pipe is connected to the tailings discharge port of the flotation column.

[0012] Furthermore, the spiral scraper discharge pipe has an inclination angle of 20-40°.

[0013] Furthermore, the fluidized water unit includes a water tank, a water main pipe, a flow diversion controller, a first water branch pipe and a second water branch pipe.

[0014] Furthermore, one end of the water main pipe is connected to the water tank, and the other end is connected to the diversion controller, and one end of the first water branch pipe and one end of the second water branch pipe are both connected to the diversion controller.

[0015] Furthermore, the slurry unit comprises a slurry mixing barrel and a slurry supply pipe, one end of the slurry supply pipe is connected to one end of the slurry mixing barrel, and the other end of the slurry supply pipe is connected to the slurry inlet.

[0016] On the other hand, the present invention provides a coal preparation method suitable for underground operations, which uses the above-mentioned short-side arranged coarse particle fluidized flotation device to perform coal preparation operations.

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

[0018] (1) The inner cavity of the flotation column of the present invention is divided into a first chamber and a second chamber connected at the upper end, forming a one-trough two-chamber structure. The tailings cone section at the lower end of the flotation column is provided with four opposing inclined water distribution plates, and the column section at the upper end of the flotation column is provided with an array of inclined water supply pipes, which not only realizes the loose and uniform distribution of the feed, but also promotes the rapid transportation of the feed and the sorted concentrate, shortening the time; the tailings are automatically discharged by combining the pressure difference solenoid valve with the spiral scraper discharge pipe, and the tailings discharge rate is increased. At the same time, the spiral discharge method also dehydrates the tailings to a certain extent; the present invention realizes the effective improvement of the overall coarse-grained mineral flotation efficiency from the three processes of feeding, sorting and discharging, and provides a basis for the deep quality improvement and efficient utilization of low-quality coarse-grained minerals in fluidized flotation in underground operations.

[0019] (2) The short-side arrangement of the sorting process of the present invention can effectively increase the feed volume of the sorting, enhance the processing capacity of the fluidized flotation device, and meet the production requirements of underground operations for "large and fast" sorting results; the shorter sorting process accelerates the sorting rate, and the compact layout minimizes the occupation of the tunnel space, providing protection for underground mining operations and worker safety.

[0020] (3) The present invention adjusts the inclination angle of the water distribution plate according to the feed slurry flow rate, so that the four opposite inclined feed pipes and the four opposite water distribution plates are synergistically coupled, which promotes the diffusion of bubbles and enhances the flotation quality, thereby improving the sorting efficiency and flexibility.

[0021] (4) The coarse-grained fluidized flotation device of the present invention can quickly, efficiently and flexibly sort and pre-discard coal according to the coal quality characteristics of different coal seams by adjusting the flotation process parameters and reagent system during underground operations, thereby improving sorting efficiency, reducing mine transportation pressure, and increasing mine production capacity; the compact short-side layout effectively reduces space occupancy and ensures the reliability and safety of underground operations; the integration of underground "mining-selection-charging" greatly improves the comprehensive utilization rate of resources, optimizes the sorting and pre-discarding processes, and realizes the enhancement of the sorting and utilization process of low-quality coarse-grained mineral resources in 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 realized 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 schematic diagram of a coarse particle fluidized flotation device arranged on the short side of a specific embodiment;

[0025] Figure 2 It is a schematic front view of a coarse particle fluidized flotation device arranged on the short side of a specific embodiment;

[0026] Figure 3 It is a schematic diagram of the rubber sealing structure of the water distribution plate of a specific embodiment.

[0027] Reference numerals:

[0028] 100-flotation unit; 101-flotation column; 102-flotation column; 103-concentrate overflow tank; 104-first chamber; 105-second chamber; 106-partition plate; 107-concentrate discharge port; 108-feeding conveying pipe; 109-inclined feed pipe; 110-slurry feed port; 111-pressure sensor; 112-accident discharge port; 113-spiral scraper discharge pipe; 114-first electromagnetic valve; 200-fluidized water unit; 201-water tank; 202- Diversion controller; 203-first water branch pipe; 204-second water branch pipe; 205-supplementary water pipe; 206-first diversion pipe valve; 207-bubble generator; 208-water distribution plate; 209-liquid flow meter; 210-second diversion pipe valve; 211-first centrifugal pump; 212-air pump; 213-gas pipe; 214-gas flow meter; 215-water main pipe; 300-slurry unit; 301-slurry mixing barrel; 302-slurry pump; 303-slurry supply pipe. DETAILED DESCRIPTION

[0029] 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.

[0030] Example 1

[0031] A specific embodiment of the present invention, as Figure 1 As shown, a short-side arranged coarse-grained fluidized flotation device for underground operation is disclosed, comprising a flotation unit 100, a fluidized water unit 200 and a slurry unit 300, wherein the fluidized water unit 200 provides fluidized water to the flotation unit 100, and the slurry unit 300 provides slurry to the flotation unit 100.

[0032] It should be noted that the short side arrangement in this embodiment means that the long side of the equipment is arranged perpendicular to the direction of the lane, and the short side of the device including the two chambers is parallel to the lane.

[0033] like Figure 1As shown, the flotation unit 100 includes a flotation column 101, and the flotation column 101 includes a flotation column body 102 and a concentrate overflow tank 103. The concentrate overflow tank 103 is arranged at the top of the flotation column body 102. Figure 2 As shown, the inner cavity of the flotation column 102 is divided into a first chamber 104 and a second chamber 105, the first chamber 104 and the second chamber 105 are arranged side by side left and right (or front and back), and the upper end of the first chamber 104 is connected to the upper end of the second chamber 105, and the lower end of the first chamber 104 is not connected to the lower end of the second chamber 105, forming a one-tank two-chamber structure. The first chamber 104 and the second chamber 105 have the same structure, both of which are columnar in the upper section and conical in the lower section.

[0034] like Figure 2 As shown, a partition plate 106 is provided in the middle of the first chamber 104 and the second chamber 105, and the partition plate 106 separates the first chamber 104 and the second chamber 105 into a one-trough two-chamber structure. Specifically, the partition plate 106 is located at the lower end of the column section of the first chamber 104 and the column section of the second chamber 105, and separates the lower ends of the two, and the lower end of the partition plate 106 is connected to the upper end of the cone section of the first chamber 104 and the upper end of the cone section of the second chamber 105 at the same time.

[0035] It is worth noting that the length of a single chamber of the fluidized flotation cell (i.e., the inner cavity of the flotation column 102) is generally 0.8-1.0 m, preferably 0.8 m. Considering the limited working conditions of underground operations, the height of the sorting cell (i.e., the column section of the flotation column 102) is generally consistent with the length, preferably 0.8 m. The height of the bottom tailings cone (i.e., the cone section of the flotation column 102) is generally set to 0.5 m, and the inclination angle of the cone wall is shown in the above-mentioned specific implementation. The top overflow weir (i.e., the concentrate overflow trough 103) is set 0.1 m higher than the upper part of the sorting cell (i.e., the flotation column 102), and the inclination angle is generally set to 20-40°. Considering the limited working conditions and compact layout of the underground, 30° is preferred.

[0036] like Figure 1 As shown, a concentrate discharge port 107 is provided at the bottom end of the concentrate overflow trough 103 . It can be understood that the concentrate in the flotation column 102 floats up into the concentrate overflow trough 103 and can be discharged through the concentrate discharge port 107 .

[0037] Considering the slurry feed, such as Figure 1As shown, the flotation unit 100 further includes a feed conveying pipe 108 and an inclined feed pipe 109. A pulp feed port 110 is provided at the upper end of the flotation column 102. The pulp feed port 110 is communicated with the inner cavity of the flotation column 102. The feed conveying pipe 108 is provided at the upper part of the inner cavity of the flotation column 102. One end of the feed conveying pipe 108 is communicated with the pulp feed port 110, and the other end is communicated with the inclined feed pipe 109. There are multiple inclined feed pipes 109, and the multiple inclined feed pipes 109 are evenly distributed around the circumference of the feed conveying pipe 108. Preferably, there are four inclined feed pipes 109, and the four inclined feed pipes 109 are located in four directions. Exemplarily, the four inclined feed pipes 109 are evenly arranged around the circumference of the feed conveying pipe 108.

[0038] In this embodiment, a plurality of inclined feed pipes 109 are provided at the upper end of the inner cavity of the flotation column 102, and the plurality of inclined feed pipes 109 are evenly distributed around the circumference of the feed conveying pipe 108. The inclined feed pipes 109 are inclined in all directions to feed the material, so that the feed amount per unit time is increased, and the feed is also dispersed along the spatial cross section, so that rapid dispersion in the space is achieved from the feed angle, and the dispersion efficiency of the reagent is improved. The inclination angle of the inclined feed pipe 109 is generally set to 45-75°, preferably 60°.

[0039] In order to monitor the tailings accumulation state in the flotation column 102 so as to discharge the tailings at an appropriate time, Figure 1 As shown, the flotation unit 100 further includes a pressure sensor 111, and a plurality of pressure sensors 111 are provided, and the plurality of pressure sensors 111 are arranged along the height direction of the flotation column 102. Preferably, the pressure sensor 111 is arranged below the slurry inlet 110 and is evenly arranged. The tailings accumulation state is monitored in real time by the pressure sensor 111, and the tailings are discharged when the pressure reaches a preset upper limit, and the discharge is stopped when the pressure drops to a preset lower limit, so as to prevent the fluidized bed pressure from changing suddenly due to excessive discharge, and ensure the stability of the fluidized bed.

[0040] It should be noted that since the inner cavity of the flotation column 102 is divided into a first chamber 104 and a second chamber 105 , the lower ends of the first chamber 104 and the second chamber 105 can be used to collect tailings. Therefore, pressure sensors 111 are provided on the cylinder walls corresponding to the first chamber 104 and the second chamber 105 .

[0041] like Figure 1 and Figure 2As shown, an emergency discharge port 112 and a spiral scraper discharge pipe 113 are provided at the lower end of the flotation column 102. The emergency discharge port 112 is provided at the cone section of the flotation column 102, and the spiral scraper discharge pipe 113 is connected to the tailings discharge port of the flotation column 102. A first electromagnetic valve 114 is provided at the connection between the spiral scraper discharge pipe 113 and the tailings discharge port. When the tailings need to be discharged, the first electromagnetic valve 114 is opened, and the spiral scraper discharge pipe 113 is used for discharge, so that the tailings are automatically discharged, and the tailings discharge rate is increased. At the same time, the spiral discharge method also dehydrates the tailings to a certain extent. In addition, when equipment failure or regular maintenance is required, the slurry in the device can be quickly emptied through the emergency discharge port 112. The diameter of the emergency discharge port 112 is designed to accommodate maintenance workers to enter the tank for maintenance.

[0042] It is worth noting that in order to adapt to underground operations, the length of the tailings discharge port of the flotation column 102 should not be too long, generally 0.1-0.3m, preferably 0.1m, the spiral scraper discharge pipe 113 is generally installed at an inclined angle of 20-40°, also to adapt to the restricted height conditions underground, preferably 20°, the spiral scraper speed is generally 800-1000rpm, considering the motor to ensure use and rapid tailings discharge, preferably 900rpm.

[0043] In this embodiment, by combining the pressure sensor 111, the first electromagnetic valve 114 and the spiral scraper discharge pipe 113, based on the real-time monitoring of the bed pressure drop by the pressure sensor 111, when the pressure difference reaches the upper limit of the set range, the tailings discharge port is opened, and the tailings are quickly discharged through the spiral scraper discharge pipe 113, and a certain degree of dehydration is achieved. This structure can quickly discharge the tailings after sorting, and quickly process the settled tailings after sorting, avoiding the adverse effect of the slow tailings discharge time delaying the entire flotation time, and realizing the rapid discharge and dehydration of the tailings in the tailings discharge stage.

[0044] like Figure 1 As shown, the fluidized water unit 200 includes a water tank 201, a water main pipe 215, a diversion controller 202, a first water branch pipe 203 and a second water branch pipe 204. One end of the water main pipe 215 is connected to the water tank 201, and the other end is connected to the diversion controller 202. One end of the first water branch pipe 203 and one end of the second water branch pipe 204 are both connected to the diversion controller 202.

[0045] In order to add water to the flotation column 102, Figure 1 and Figure 2As shown, the fluidized water unit 200 further includes a supplementary water pipe 205, and a plurality of supplementary water pipes 205 are provided, and the plurality of supplementary water pipes 205 are evenly arranged around the flotation column 102. The upper end of the supplementary water pipe 205 is communicated with the inner cavity of the flotation column 102, and the lower end of the supplementary water pipe 205 is connected to the other end of the second water delivery branch pipe 204. In order to control the water flow rate in the second water delivery branch pipe 204, a first diversion pipe valve 206 is provided on the second water delivery branch pipe 204.

[0046] like Figure 1 As shown, the fluidized water unit 200 further includes a bubble generator 207 and a water distribution plate 208. The bubble generator 207 is arranged on the first water delivery branch pipe 203. The water distribution plate 208 is arranged inside the flotation column 102, specifically in the cone section of the flotation column 102. There are multiple water distribution plates 208, and the multiple water distribution plates 208 are arranged at an angle and at an even spacing in the cone section of the flotation column 102. The water distribution plates 208 face the inner cavity of the flotation column 102, and the first water delivery branch pipe 203 is connected to the water distribution plates 208. Preferably, there are four water distribution plates 208, and the four water distribution plates 208 are arranged opposite to each other.

[0047] It is worth noting that Figure 3 As shown, a one-way annular rubber seal is provided at the air outlet of the water distribution plate 208, which can prevent material blockage caused by tailings sinking while ensuring the normal feeding of bubbles and reagents, effectively prolonging the service life of the water distribution plate 208 and reducing the amount of equipment maintenance. Figure 3 The enlarged schematic diagram of a gas outlet of the water distribution plate 208 is shown in FIG. The tilt angle of the water distribution plate 208 can be adjusted according to the falling conditions of the feed material, and the general range can be set to 30-60°, preferably 45°. Therefore, a tilt control device for the water distribution plate 208 is also provided, such as a hydraulic tilt mechanism, as long as the structure that can achieve tilt control is used.

[0048] In this embodiment, by arranging four water distribution plates 208 inclined opposite to each other at the bottom of the trough, four inclined feed pipes 109 opposed to each other above the trough, and an array of inclined upper water supply pipes 205 on the trough wall, the fluidization state can be quickly achieved, and the loose and uniform distribution of the feed is achieved, while promoting the rapid transportation of the feed and the sorted concentrate, thereby shortening the time.

[0049] In order to control the water flow speed and flow rate in the first water delivery branch pipe 203, as Figure 1As shown, the fluidized water unit 200 further includes a liquid flow meter 209 and a second diverter valve 210, both of which are arranged on the first water delivery branch pipe 203. In order to transport the water in the water tank 201 to the flotation column 102, the fluidized water unit 200 further includes a first centrifugal pump 211, which is arranged on the first water delivery branch pipe 203. It can be understood that the second water delivery branch pipe 204 is provided with a second centrifugal pump (not shown in the figure).

[0050] like Figure 1 As shown, the fluidized water unit 200 also includes an air pump 212 , an air pipe 213 and a gas flow meter 214 . One end of the air pipe 213 is connected to the air pump 212 , and the other end is connected to the bubble generator 207 . The gas flow meter 214 is arranged on the air pipe 213 .

[0051] like Figure 1 As shown, the slurry unit 300 includes a slurry mixing barrel 301, a slurry pump 302 and a slurry supply pipe 303. The slurry pump 302 is arranged on the slurry supply pipe 303 to provide power for the slurry in the slurry mixing barrel 301. One end of the slurry supply pipe 303 is connected to one end of the slurry mixing barrel 301, and the other end is connected to the slurry inlet 110.

[0052] This embodiment is particularly suitable for the recovery of coarse-grained valuable minerals of coal and various mineral resources in underground operations and the design of pre-disposal of ore after mining. Based on the rapid coal selection in the underground, it effectively realizes the integration of "mining-selection-filling", reduces the transportation cost of the mine, and improves the economic benefits. The overall structural design of "one tank and two chambers" is adopted. At the same time, the structural design is combined with the four-sided inclined opposite arrangement of the water distribution plate 208 at the bottom of the tank and the four-sided inclined feed pipe 109, as well as the tank wall array-type inclined upper water supply, to achieve loose and uniform distribution of the feed, promote the rapid transportation of the feed and the selected concentrate, and shorten the time; the bottom tailings discharge adopts a structural design combining a pressure difference electromagnetic valve and a spiral scraper discharge pipe 113, which realizes the automatic discharge of the tailings and improves the tailings discharge rate. At the same time, the spiral discharge method also dehydrates the tailings to a certain extent. Based on this, the flotation device of this embodiment achieves effective improvement in the overall flotation efficiency of coarse-grained minerals from the three processes of feeding, sorting and discharging, providing a basis for the refined quality improvement and efficient utilization of low-quality coarse-grained minerals in fluidized flotation in underground operations.

[0053] The short-side layout design of the sorting process of this embodiment shows its advantages in many aspects. First, it can effectively increase the feed volume of the sorting, enhance the processing capacity of the fluidized flotation device, and meet the production requirements of underground operations for "large and fast" sorting results. Secondly, the shorter sorting process accelerates the sorting rate, and the compact layout minimizes the occupation of the tunnel space, providing protection for underground mining operations and worker safety. In addition, the design of the one-side oblique pump feed delivery pipe 108 and the four-sided inclined feed pipe 109 not only improves the feed rate, but also solves the problem of uneven feed distribution. Combined with the structure of the four-sided inclined opposing water distribution plate 208, the fluidized state can be quickly achieved. The three-sided inclined concentrate overflow trough 103 at the top except the feed side, and the oblique upper feeding design of the trough side water supplementation, speed up the collection and discharge speed of the concentrate after sorting, and reduce the time of sorting and transportation.

[0054] Example 2

[0055] Another specific embodiment of the present invention discloses a coal preparation method suitable for underground operation, using the short-side arranged coarse particle fluidized flotation device for underground operation of embodiment 1, and the steps include:

[0056] Step S1: Checking the trough fluidized bed flotation device.

[0057] First, confirm that the accident discharge port 112 and the tailings discharge port are in a closed state to prevent accidental leakage of the mineral particles to be sorted. After a comprehensive inspection, the sorting process can begin.

[0058] Step S2: Add a frother to pre-fluidize the water.

[0059] The air pump 212 is turned on, and the gas velocity in the gas pipe 213 is adjusted by the air pump 212. The gas velocity can be adjusted within the range of 0.3-1.2 m / s according to the sorting conditions.

[0060] Open the pipeline valve (second diverter valve 210) of the water tank 201, and let the clean water be pressurized by the first centrifugal pump 211. The water flow rate after pressurization can be accurately adjusted by the liquid flow meter 209. Subsequently, the water flows through the bubble generator 207 as a fluidized medium, and enters the interior of the flotation column 102 through the four water distribution plates 208 that are tilted and opposed. When the clean water flows through the bubble generator 207 at a high speed (the speed can be adjusted to 2.0-8.0m / s, adjusted according to the properties of the feed), cavitation will occur due to the negative pressure of the throat of the bubble generator 207, thereby generating micro-nano-sized bubbles. These bubbles then enter the bottom of the flotation column 102 (i.e., the tank body) through the water distribution plate 208, and diffuse from bottom to top in the entire tank body space along with the oblique upward water flow.

[0061] The foaming agent generally includes pine oil (No. 2 oil), methyl isobutyl carbinol (MIBC) and diethyl phthalate, among which pine oil (No. 2 oil) is preferred. The foaming agent (usage is generally set to 5-15g / m 3 , adjusted according to the bubble dispersion) is added to the water tank 201, and mixed with clean water and enter the tank body together. After the bubbles are evenly dispersed in the tank space, the second diverter valve 210 is closed to complete the preparation work of the whole process.

[0062] It should be noted that the diffusion of bubbles in the tank space can be measured by the pressure sensor 111 to calculate the pressure drop of faults at different heights, and the cloud map of the gas content distribution can be directly visualized using resistance tomography to reflect the bubble diffusion situation.

[0063] Step S3: adding a collector to pre-mix the slurry.

[0064] Add collector (usually 200-800 g / m 3 , adjusted according to the specific sorting situation), the collectors generally include sodium ethyl xanthate, sodium isopropyl xanthate, sodium (potassium) butyl xanthate, sodium (potassium) isobutyl xanthate, etc., preferably sodium ethyl xanthate (ethyl xanthate). The slurry concentration can be set to 30-40% based on relevant research (adjusted according to the specific sorting situation and mineral properties). The slurry adjustment time can be set to 3-5min (the specific time can be adjusted according to the fine-grained mineral content of the slurry and the sorting efficiency, etc.), and the raw slurry is pressurized by the slurry pump 302 on the slurry supply pipe 303, and then enters the interior of the flotation column 102 from the slurry inlet 110 extending to the wall of the fluidized flotation tank.

[0065] Step S4: trough flotation process control.

[0066] The feed is discharged from the slurry mixing barrel 301 through the inclined feed conveying pipe 108 and the four-sided inclined feed pipe 109 to the trough sorting chamber. During the sorting process, the flow rate of the annular array type water supplement on the trough side should be adjusted according to the concentrate transportation situation. In order to save water, the water supplement valve (i.e., the first diversion pipe valve 206) can be opened 3-5 minutes after the start of feeding. The sorted concentrate particles float up and are collected through the concentrate overflow trough 103 to the concentrate discharge port 107 for discharge. The tailings particles sink to the bottom of the trough body, and the tailings accumulation state is monitored in real time by the pressure sensor 111. When the pressure reaches the preset upper limit, the first electromagnetic valve 114 is automatically opened to discharge the tailings through the spiral scraper discharge pipe 113; when the pressure drops to the preset lower limit, the first electromagnetic valve 114 is closed to prevent excessive discharge from causing a sudden change in the fluidized bed pressure and ensure the stability of the fluidized bed. The water distribution plate 208 is regulated according to the feed slurry flow rate. The mathematical model of the inclination angle of the water distribution plate 208 and the slurry flow rate is as follows:

[0067]

[0068] Wherein, θ is the inclination angle of the water distribution plate 208, °; θ org , initial inclination angle of the water distribution plate 208, °; Q, detected slurry flow, m 3 / h;Q ave , average slurry flow, that is, half of the critical maximum slurry flow, m 3 / h;Q max , critical maximum slurry flow, m 3 / h;θ cst , modulation angle (i.e. angle adjustment amount), °.

[0069] It should be noted that the initial inclination angle of the water distribution plate 208 is generally set to 45°, and the critical maximum slurry flow rate is set according to the early discharge pipeline loss assessment and equipment maintenance and sorting conditions, and is initially set to 150m 3 / h (single chamber volume), the modulation angle can be adjusted on site according to factors such as material properties and slurry concentration, and is initially set to 30°; at the same time, an emergency stop control part is set. When the detected flow rate is greater than the critical maximum slurry flow rate, it will prompt the sorting abnormality and stop the feeding device to stop feeding. In order to obtain the slurry flow rate, a flow monitoring device needs to be set on the slurry supply pipe 303.

[0070] The fluidized bed flotation column based on fluidization technology in this embodiment can efficiently and quickly sort and discharge the coarse-grained minerals mined underground, realizing the concept of "mining-sorting-filling" integration underground. This can not only greatly improve the comprehensive utilization efficiency of resources, enhance the production capacity of mines, and reduce the transportation burden, but also improve the adaptability of the fluidized bed flotation device to the characteristics of different coal seams and coal types by accurately adjusting process parameters such as air intake, water flow rate, and reagent system, thereby improving sorting efficiency and flexibility.

[0071] The coarse-grained mineral fluidized flotation device of this embodiment can quickly, efficiently and flexibly sort and pre-discard according to the coal quality characteristics of different coal seams by adjusting the flotation process parameters and reagent system during underground operations, thereby improving sorting efficiency, reducing mine transportation pressure, and increasing mine production capacity. The compact short-side layout effectively reduces space occupancy and ensures the reliability and safety of underground operations. Based on the concept of underground "mining-selection-charging" integration, the comprehensive utilization rate of resources is greatly improved, the sorting and pre-discarding processes are optimized, and the sorting and utilization process of low-quality coarse-grained mineral resources in underground operations is strengthened.

[0072] 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 short-side coarse-grained fluidized flotation device for underground operations, characterized in that: It comprises a flotation unit (100), a fluidizing water unit (200) and a pulp unit (300), wherein the fluidizing water unit (200) is used to provide fluidizing water, and the pulp unit (300) is used to provide pulp; The flotation unit (100) comprises a flotation column (101), wherein the flotation column (101) comprises a flotation column body (102) and a concentrate overflow trough (103), wherein the concentrate overflow trough (103) is arranged at the top of the flotation column body (102), and the inner cavity of the flotation column body (102) is divided into a first chamber (104) and a second chamber (105).

2. The short-side arranged coarse particle fluidized flotation device for underground operation according to claim 1, characterized in that: A slurry inlet (110) is provided at the upper end of the flotation column (102), and the slurry inlet (110) is communicated with the inner cavity of the flotation column (102).

3. The short-side arranged coarse particle fluidized flotation device for underground operation according to claim 2, characterized in that: The flotation unit (100) further comprises a feed conveying pipe (108) and an inclined feed pipe (109) arranged in the flotation column (102).

4. The short-side arranged coarse particle fluidized flotation device for underground operation according to claim 3, characterized in that: One end of the feed conveying pipe (108) is in communication with the slurry feed port (110), and the other end is in communication with the inclined feed pipe (109).

5. The short-side arranged coarse particle fluidized flotation device for underground operation according to claim 1, characterized in that: A spiral scraper discharge pipe (113) is provided at the lower end of the flotation column (102), and the spiral scraper discharge pipe (113) is connected to the tailings discharge port of the flotation column (102).

6. The short-side arranged coarse particle fluidized flotation device for underground operation according to claim 5, characterized in that: The spiral scraper discharge pipe (113) has an inclination angle of 20-40°.

7. The short-side arranged coarse particle fluidized flotation device for underground operation according to any one of claims 1 to 6, characterized in that: The fluidized water unit (200) comprises a water tank (201), a water delivery main pipe (215), a flow diversion controller (202), a first water delivery branch pipe (203) and a second water delivery branch pipe (204).

8. The short-side arranged coarse particle fluidized flotation device for underground operation according to claim 7, characterized in that: One end of the water supply main pipe (215) is connected to the water tank (201), and the other end is connected to the diversion controller (202); one end of the first water supply branch pipe (203) and one end of the second water supply branch pipe (204) are both connected to the diversion controller (202).

9. The short-side arranged coarse particle fluidized flotation device for underground operation according to claim 2 or 3, characterized in that: The slurry unit (300) comprises a slurry mixing barrel (301) and a slurry supply pipe (303); one end of the slurry supply pipe (303) is connected to one end of the slurry mixing barrel (301), and the other end is connected to the slurry inlet (110).

10. A coal preparation method suitable for underground operations, characterized in that: The short-side arranged coarse-grained fluidized flotation device described in any one of claims 1 to 9 is used for coal preparation operations.

Images