Fluidized coarse particle flotation device and method capable of adjusting water flow field and turbulence

Abstract

The present application relates to a kind of adjustable water-air flow field and turbulence intensity's fluidized coarse particle flotation device and method, device includes flotation column, the water-air mixer of intercommunication and several water-air jet gun, water-air jet gun is equipped with the jet zone for vertically upward injection microbubble and water-air mixed fluid extending to the inside of flotation column, the included angle of jet zone and the circumference radial of flotation column can be adjusted, realize the flexible adjustment of water-air flow field and turbulence intensity, facilitate the optimization exploration of flotation condition, by water-air mixer and water-air jet gun form the microbubble and water-air mixed fluid of sufficient mixing, in the stable microbubble and water flow state compound interference bed layer flotation can improve bubble flotation effect, save and reduce consumption, in the beneficiation process of " grinding - flotation " meet the flotation recovery of different coarse particle target mineral and coarse particle gangue pre-throw waste application, coarse particle flotation throw waste rate is more than 50%, sulphide concentrate recovery rate is more than 90%, oxidized ore concentrate recovery rate is more than 85%.

Description

Technical Field

[0001] This invention belongs to the field of mineral flotation technology, specifically relating to a fluidized coarse flotation device and method with adjustable water flow field and turbulence intensity. Background Technology

[0002] Flotation is the most common method for recovering valuable minerals in the mineral processing field, and it has certain requirements for the particle size of the feed ore: for non-ferrous metal ores, the upper limit is generally 0.1-0.20 mm. Grinding is an important step in reducing the particle size of the ore. Traditional flotation processes mainly use ball mills to further grind coarse-grained ores to achieve the liberation of the target minerals and reduce the particle size of the ore, so that the particle size meets the requirements of conventional froth flotation. However, on the one hand, grinding has high energy consumption and the grade of valuable minerals in coarse-grained ores is relatively low. Grinding all of them results in energy waste and increased costs. On the other hand, the flotation of coarse-grained ores depends on the upward buoyancy of the particles and bubbles to exceed their own weight. The regrinding of coarse particles is not easy to control. For easily grindable minerals, it is easy to over-grind, resulting in excessively fine particles. The coarse-grained target minerals cannot overcome their own weight and sink to become tailings, thus deteriorating the flotation effect. Therefore, improving the flotation effect of coarse particles is of great practical significance for reducing grinding operation costs and realizing the pre-disposal of coarse gangue.

[0003] In recent years, a series of fluidized bed flotation devices for coarse particles have emerged. These devices are characterized by introducing an upward flow of water into existing flotation equipment, relying on air bubbles and the upward flow to form a fluidized bed, thereby overcoming the gravity of the coarse particles and achieving flotation. This type of equipment plays a significant role in promoting the flotation and recovery of coarse particles. However, existing coarse particle flotation equipment and methods suffer from the following technical problems during use:

[0004] (1) Both the bubble and rising water flow distributors are fixed components, making it difficult to flexibly adjust the flow field and turbulence within the flotation column. They can only be adjusted in a single mode by air pressure and water pressure, which is not very adaptable to different types of minerals and ores with different properties. Sometimes it is necessary to redesign the distributor and conduct experimental exploration and redesign the core fixed components, resulting in a long research and development cycle and high research and development costs.

[0005] (2) The distribution of bubbles and rising water flow in the flotation column is relatively simple and crude, which is not conducive to the uniform distribution of the bed. For example, in a coarse particle flotation device and flotation method with swirling and damping coupling fluidization disclosed in patent CN113198619B, the spray direction of the water-air mixing jet pipe is distributed clockwise or counterclockwise with the axis of the flotation column as the center. In a microbubble secondary mineralization flotation device and flotation method disclosed in patent CN113198622B, the spray form of "side wall micropores" is used. Neither of these can flexibly adjust the flow field. At the same time, the fluid enters with the radial line of the flotation column as the center, so that the water-air fluid first converges in the center of the flotation column and then spreads upward in the flotation column. This will cause the flow field distribution in the middle and lower part of the column to be uneven. The flow field in the cross-section of the column is "strong in the center and weak around the periphery". The turbulence of bubbles and rising water flow in the column is large. The flow field in the middle and upper part of the column is unstable, which leads to coarse particles adhering to bubbles and falling off.

[0006] (3) The generation of bubbles and rising water flow in the flotation column is relatively simple and crude. The degree of bubble dispersion and bubble size are difficult to achieve the purpose of microbubble flotation. For example, in a fluidized coarse particle flotation device and flotation method disclosed in patent CN108970813B, a bubble generator is used to form bubbles and an inlet located below the bubble generator forms rising water flow. In a fluidized flotation device and method suitable for coarse particle recovery disclosed in patent CN114713379A, a bubble generation unit and an air-water mixing distribution unit are used. In a coarse particle flotation device and method of turbulent and steady flow synergistic fluidization disclosed in patent CN113499861A, bubbles and rising water flow are simply mixed outside the flotation column by a mixer. This separate generation and self-fusion method or simple mixing structure makes the dispersion and fusion flow of bubbles in the water flow poor. As a result, the flotation effect of water-air fluid on coarse particles is difficult to meet the requirements of high recovery rate of coarse particle target mineral flotation recovery and coarse particle gangue pre-tailing application. Summary of the Invention

[0007] The present invention aims to solve at least one of the above-mentioned technical problems. The present invention provides a fluidized coarse flotation device and method with adjustable water and air flow field and turbulence intensity, which can realize flexible adjustment of water and air flow field and turbulence intensity, and form a fully mixed microbubble and water-air mixed fluid, and a stable microbubble and water fluidized composite interference bed, which can improve the flotation effect, save costs and reduce consumption, and meet the needs of flotation recovery of different coarse target minerals and pre-disposal of coarse gangue.

[0008] The technical solution adopted by this invention to solve its technical problem is:

[0009] A fluidized coarse flotation device with adjustable water flow field and turbulence intensity includes a flotation column, a connected water-air mixer and several water-air jet guns. The top of the flotation column is provided with a foam overflow trough, a concentrate discharge port and a feeding device, and the bottom of the flotation column is provided with a discharge port.

[0010] The water-air jet gun has a jet zone extending into the flotation column for vertically spraying microbubbles and water-air mixed fluid upwards. The angle between the jet zone and the radial direction of the flotation column can be adjusted.

[0011] The aforementioned flotation device uses a connected water-air mixer and several water-air jet guns to form a vertically upward-spraying microbubble and water-air mixture, which facilitates the uniformity and stability of the bed and improves the microbubble flotation effect. At the same time, the angle between the jet zone and the radial direction of the flotation column has a significant impact on the distribution of the flow field within the column: the injection position of the microbubble and water-air mixture affects the uniformity of the fluidized bed distribution on the cross-section of the flotation column. Increasing the angle between the jet zone and the radial direction of the flotation column can weaken the flow field in the central region of the flotation column and affect the turbulence and bed stability. Thus, by adjusting the distribution of the microbubble and water-air mixture, the water flow field and turbulence within the fluidized coarse flotation device can be flexibly adjusted, facilitating the exploration of flotation condition optimization.

[0012] In the aforementioned flotation device, the middle and upper parts of the flotation column are cylindrical, and the lower part of the flotation column is conical, which is used to stabilize the microbubble and water fluidization composite interference bed through the cylindrical part and to discharge ore through the conical part.

[0013] Furthermore, the longitudinal length ratio of the cylinder to the cone is (2.5-3.5):1. By limiting the ratio, a stable microbubble and water fluidization composite interference bed suitable for the separation of minerals with coarse particles close to 1 mm can be formed. If the proportion of cylinders is too low, the vertical space required for bed stability will not be achieved. If the proportion is too high, the upward path of coarse particles after adhering to bubbles will be too long, which will lead to the desorption of particles from bubbles and thus deteriorate the flotation effect.

[0014] Furthermore, the angle between the cone wall and the vertical axis is 40-50°. By limiting the angle, the discharge of tailings can be made smoother, and the discharge speed is moderate and the discharge volume is easy to control. If the angle is too large, the ore will move slowly on the cone and the discharge will be not smooth, which will easily cause blockage. If the angle is too small, the ore will move too fast on the cone and the discharge volume will be difficult to control.

[0015] Furthermore, the jet zone is located near the junction of the cylinder and the cone, which is used to further enhance the bed stabilization function of the cylinder and the ore discharge function of the cone.

[0016] The aforementioned flotation apparatus further includes a water-air mixer comprising a shell and a water-air shear disperser. The shell comprises, in sequence along the fluid input to output direction, a water-air mixing pipe, a contraction pipe, a throat pipe, and a diffuser pipe. The water-air mixing pipe is provided with a pressurized water jet pipe extending into the interior of the water-air mixing pipe and several high-pressure gas jet pipes. The high-pressure gas flow from the high-pressure gas jet pipe can intersect with the pressurized water flow from the pressurized water jet pipe to form a water-air mixed fluid. The water-air shear disperser is located inside the diffuser pipe.

[0017] The aforementioned flotation device uses the high-pressure gas flow from the high-pressure gas jet pipe and the pressurized water flow from the pressurized water jet pipe to initially mix in the water-gas mixing pipe to form a water-gas mixture fluid. The water-gas mixture fluid then passes through the contraction pipe, throat pipe, and diffuser pipe in sequence, forming a large number of bubbles. When the bubbles and the water-gas mixture fluid pass through the water-gas shear disperser in the diffuser pipe, the bubbles are further cut and dispersed into microbubbles. The water-gas mixer then mixes the gas and water into microbubbles and the water-gas mixture fluid, which is then sent to each water-gas jet gun to improve the degree of bubble dispersion and reduce the bubble size.

[0018] Furthermore, the pressurized water jet pipe is provided with a conical nozzle with a cone angle of 20-30°, and the high-pressure gas jet pipe is provided with a conical nozzle with a cone angle of 20-25°. The fluid jet angle between the pressurized water jet pipe and the high-pressure gas jet pipe is 30-55°, which is used to further enhance the jetting and further improve the water-gas mixing effect.

[0019] Furthermore, the cone angle of the contraction tube is 35-40°, the cone angle of the diffuser tube is 25-35°, and the longitudinal length ratio of the contraction tube, the throat tube, and the diffuser tube is 1:1:(2-3), which is used to further improve the uniformity of bubble dispersion in the water-air mixture and refine the bubble size.

[0020] Furthermore, the water-air shear disperser includes several tips perpendicular to the flow direction of the bubbles and the water-air mixture, which are used to further enhance the microbubble effect by cutting and dispersing the passing bubbles through the tips.

[0021] Furthermore, in the aforementioned flotation device, a water-air distributor is provided between the water-air mixer and several water-air jet guns. A valve is provided between the water-air distributor and the water-air jet guns to uniformly distribute microbubbles and water-air mixed fluid to several water-air jet guns through the water-air distributor. The number of water-air jet guns connected is controlled by opening and closing the valve, thereby further realizing flexible adjustment of the water-air flow field and turbulence.

[0022] Furthermore, the water-air jet gun is rotatably connected to the water-air distributor, which is used to adapt to the angle change of the water-air jet gun by rotating the connection when adjusting the angle of the jet zone, further facilitating the installation and adjustment of the water-air jet gun and quickly adjusting the water-air flow field and turbulence.

[0023] Furthermore, an angle adjuster is provided between the water-air jet gun and the flotation column to adjust the radial angle between the jet zone and the circumference of the flotation column. The angle adjuster drives the water-air jet gun to move relative to the flotation column, which further enables the rapid and flexible adjustment of the radial angle between the jet zone and the circumference of the flotation column, and facilitates the adjustment of the water-air flow field and turbulence.

[0024] Furthermore, the jet zone includes a fine mesh horizontally arranged at the fluid outlet of the water-air jet gun, wherein the area of ​​each individual hole in the fine mesh is 0.04-0.36 mm². 2 The microbubbles and water-air mixture along the water-air jet gun are further dispersed into tiny bubbles and water columns through a fine mesh, which can improve the flotation effect.

[0025] Furthermore, the angle α between the jet zone and the radial direction of the flotation column is 0-45°. Within this angle range, there is a better flow field distribution. If the angle exceeds 45°, the flow field in the central region of the column will be weak. After the feed enters the central region, there will be less contact with the water flow and air bubbles, thus making it impossible to obtain good separation indicators.

[0026] Furthermore, the flotation column is equipped with a damping structure located above the jet zone. The damping structure includes at least two continuous or spaced damping rings. The longitudinal distance from the lowest position of the damping structure to the bottom of the flotation column is ≥1 / 3 of the column's axial height. The number, distribution, and position of the damping rings in the damping structure can interfere with the formation of the bed and further regulate the flow field and turbulence: increasing the number and density of the damping rings can reduce the turbulence of the flow field inside the column and reduce the turbulent resistance of the coarse particles adhering to and floating with the bubbles, thus promoting the floating of coarse particles; if the position of the damping structure is too low, it will prematurely affect the formation of the interfering bed and is not conducive to the stability of the bed; if the position is too high, it will not be able to regulate the turbulence.

[0027] A fluidized coarse particle flotation method, based on the fluidized coarse particle flotation device with adjustable water flow field and turbulence intensity as described in any one of the above-mentioned methods, the method comprising:

[0028] Adjust the number of water-air jet guns connected to the water-air mixer, and the angle between the jet zone and the radial direction of the flotation column circumference;

[0029] The water-air mixer mixes gas and water into microbubbles and water-air mixture fluid and sends it to each water-air jet gun. The water-air jet gun sprays the microbubbles and water-air mixture fluid vertically upward inside the flotation column through the jet zone. After the flow field stabilizes, a microbubble and water fluidized composite interference bed is formed.

[0030] After the coarse-particle slurry is conditioned, it is floated in a microbubble and water fluidized composite interference bed by a feeding device. The foam concentrate enters the foam overflow tank and is discharged through the concentrate discharge port to become the final concentrate, while the tailings sink and are discharged through the discharge port to become the final tailings.

[0031] Furthermore, the microbubbles ejected in the jet zone and the water-air mixture have a microbubble size of 50-200 μm, and the dispersion of microbubbles in the water-air mixture reaches more than 80%. By controlling the degree of microbubble dispersion and the microbubble size, the purpose of microbubble flotation can be further achieved.

[0032] Furthermore, the coarse-grained minerals in the coarse-grained slurry have a particle size of 0.1-1.2 mm, which can make full use of the flotation device and flotation method, further enhance the flotation effect of water-air fluid on coarse particles, and reduce ball mill load and energy consumption.

[0033] Furthermore, the coarse-grained pulp includes collectors and frothers, which are used to further improve the flotation effect of each mineral after thorough pulp conditioning.

[0034] Furthermore, the coarse-grained minerals include sulfide minerals and oxide minerals, wherein the sulfide minerals include molybdenite and lead-zinc ore, and the oxide minerals include scheelite, cassiterite, and ilmenite, resulting in tailings with extremely low grades of the target minerals, thereby further improving the waste rate of coarse-grained flotation and the concentrate recovery rate.

[0035] Compared with the prior art, the beneficial effects of the present invention are:

[0036] (1) By adjusting the angle between the jet zone of the microbubbles and water-air mixture that extends into the interior of the flotation column and is sprayed vertically upward and the radial direction of the flotation column, the present invention can form a microbubble and water fluidization composite interference bed with adjustable water flow field distribution and turbulence intensity in the flotation column. This solves the technical problem that the water flow field and turbulence intensity are difficult to adjust due to fixed components and single pressure mode, thus adapting to the flotation of coarse-grained ores of different types and properties, and has strong flexibility and adaptability.

[0037] (2) The present invention can explore the optimization of flotation conditions by adjusting the water flow field and turbulence of the microbubble and water fluidization composite interference bed, which greatly shortens the long-cycle R&D process that requires redesigning the core fixed components due to poor flotation effect.

[0038] (3) By vertically spraying microbubbles and water-air mixed fluid upwards, this invention can be used in combination with the number and layout of water-air jet guns and the number and layout of damping rings to further form an adjustable and stable microbubble and water fluidization composite interference bed. This solves the technical problem that the distribution of bubbles and rising water in the flotation column is relatively simple and coarse, which is not conducive to the uniform distribution of the interference bed. It also avoids coarse particles from adhering to bubbles and falling off, which affects the flotation effect.

[0039] (4) The present invention forms a mixture of microbubbles and water through a water-air mixer, and then further forms a water-air rising fluid in the flotation column through the jet zone of the water-air jet gun. This can solve the technical problem that the degree of bubble dispersion and bubble size are difficult to achieve the purpose of microbubble flotation, and strengthen the flotation effect of water-air fluid on coarse particles.

[0040] (5) The tailings obtained by this invention contain extremely low grade of target minerals. They can be directly used as final tailings in the "grinding-flotation" beneficiation process, and gangue minerals can be removed from the process in a timely manner. This can reduce the load on the ball mill, reduce the amount of flotation process, and significantly reduce energy consumption.

[0041] In summary, this invention can be used for the flotation recovery of coarse-grained minerals with a particle size of 0.1-1.2 mm. It has good separation effect on sulfide minerals such as molybdenite and lead-zinc ore, as well as oxide minerals such as scheelite, cassiterite, and ilmenite. The coarse-grained flotation waste rate can reach more than 50%, the sulfide mineral concentrate recovery rate is more than 90%, and the oxide mineral concentrate recovery rate is more than 85%. It can significantly reduce operating costs and meet the needs of flotation recovery of different coarse-grained target minerals and pre-disposal of coarse gangue. Attached Figure Description

[0042] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0043] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0044] Figure 2 This is a schematic diagram of the water-air mixer of Embodiment 1 of the present invention;

[0045] Figure 3 This is a schematic diagram of the water jet gun of Embodiment 1 of the present invention;

[0046] Figure 4 This is a schematic diagram of the combined use of the water-air jet gun in Embodiment 1 of the present invention;

[0047] Figure 5 This is a schematic diagram of the adjustment and changes of the water jet gun in Embodiment 1 of the present invention;

[0048] Figure 6 This is a schematic diagram of the structure of Embodiment 4 of the present invention;

[0049] Figure 7 This is a schematic diagram of the damping ring in Embodiment 4 of the present invention.

[0050] The diagram shows the following components: flotation column 1, foam overflow trough 2, concentrate discharge port 3, feed pipe 4, feed distributor 5, discharge port 6, water-air distribution pipe 7, water-air jet gun 8, vertical pipe 801, horizontal square pipe 802, micro-grid 803, angle adjuster 804, adjusting seat 8041, knob 8042, angle instrument 8043, bolt 8044, rotating shaft 8045, rotating joint 805, elastic sealing structure 806; water-air mixer 9, shell 91, water-air mixing pipe 911, contraction pipe 912, throat pipe 913, diffuser pipe 914, pressurized water jet pipe 915, high-pressure gas jet pipe 916, water-air shear disperser 92, tip 921, damping ring 10, pressurized water pump 11, feed pool 12, high-pressure gas box 13. Detailed Implementation

[0051] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention. They are merely some embodiments of the present invention, not all embodiments, and should not be construed as limiting the present invention.

[0052] In the description of this invention, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," "outer," and "circumference," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In the description of this invention, "a plurality of" or "several" means two or more, unless otherwise explicitly specified.

[0053] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0054] Example 1:

[0055] like Figure 1-5As shown, this is a preferred embodiment of the fluidized coarse flotation device with adjustable water flow field and turbulence intensity according to the present invention. The flotation device includes a flotation column 1, a water-air mixer 9 connected in series and several water-air jet guns 8. The top of the flotation column 1 is provided with a foam overflow trough 2, a concentrate discharge port 3 and a feeding device, and the bottom of the flotation column 1 is provided with a discharge port 6.

[0056] The water-air jet gun 8 is provided with a jet zone extending into the flotation column 1 for vertically spraying microbubbles and water-air mixed fluid upwards. The water-air jet gun 8 can adjust the angle between the jet zone and the radial direction of the circumference of the flotation column 1.

[0057] The above-mentioned flotation device further includes a feeding device comprising a feeding pipe 4 extending into the flotation column 1 and a feeding distributor 5 connected to the feeding pipe 4 and located below the foam overflow trough 2, so that the slurry can slowly descend along the feeding pipe 4 and the feeding distributor 5 within the flotation column 1 across the entire cross section, thereby achieving uniform feeding and further improving the flotation effect.

[0058] In the above-mentioned flotation device, the middle and upper parts of the flotation column 1 are cylindrical, and the lower part of the flotation column 1 is a cone, which is used to stabilize the microbubble and water fluidization composite interference bed through the cylindrical part and to discharge ore through the cone.

[0059] Furthermore, the longitudinal length ratio of the cylinder to the cone is (2.5-3.5):1. By limiting the ratio, a stable microbubble and water fluidization composite interference bed suitable for the separation of minerals with coarse particles close to 1 mm can be formed. If the proportion of cylinders is too low, the vertical space required for bed stability will not be achieved. If the proportion is too high, the upward path of coarse particles after adhering to bubbles will be too long, which will lead to the desorption of particles from bubbles and thus deteriorate the flotation effect.

[0060] Furthermore, the angle between the cone wall and the vertical axis is 40-50°. By limiting the angle, the discharge of tailings can be made smoother, and the discharge speed is moderate and the discharge volume is easy to control. If the angle is too large, the ore will move slowly on the cone and the discharge will be not smooth, which will easily cause blockage. If the angle is too small, the ore will move too fast on the cone and the discharge volume will be difficult to control.

[0061] Furthermore, the jet zone is located near the junction of the cylinder and the cone, which is used to further enhance the bed stabilization function of the cylinder and the ore discharge function of the cone.

[0062] In the above-mentioned flotation device, the water-air mixer 9 further includes a housing 91 and a water-air shear disperser 92. The housing 91 includes, in sequence along the fluid input to output direction, a water-air mixing pipe 911, a contraction pipe 912, a throat pipe 913, and a diffuser pipe 914. The water-air mixing pipe 911 is provided with a pressurized water jet pipe 915 and a plurality of high-pressure gas jet pipes 916 extending into the water-air mixing pipe 911. The high-pressure gas flow of the high-pressure gas jet pipe 916 can intersect with the pressurized water flow of the pressurized water jet pipe 915 to form a water-air mixed fluid. The water-air shear disperser 92 is located inside the diffuser pipe 914.

[0063] Furthermore, the water-air mixer 9 is installed outside the flotation column 1, the pressurized water jet pipe 915 is connected to the pressurized water pump 11, and the pressurized water pump 11 is connected to the water tank. The pressurized water pump 11 is used to pressurize the water in the water tank and pump it into the pressurized water jet pipe 915 to form a pressurized water jet. Several high-pressure gas jet pipes 916 are connected to a high-pressure gas box 13. The high-pressure gas box 13 is used to generate a high-pressure airflow and distribute it to several high-pressure gas jet pipes 916 to form a high-pressure gas jet, thereby realizing the generation of pressurized water jet and high-pressure gas jet. The flow field and turbulence can be further adjusted by adjusting the air pressure and water pressure.

[0064] Furthermore, the pressurized water jet pipe 915 is provided with a conical nozzle with a cone angle of 20-30°, and the high-pressure gas jet pipe 916 is provided with a conical nozzle with a cone angle of 20-25°. The fluid jet angle between the pressurized water jet pipe 915 and the high-pressure gas jet pipe 916 is 30-55°, which is used to further enhance the jetting and further improve the water-gas mixing effect.

[0065] Furthermore, the pressure injection pipe is arranged axially along the housing 91, and several high-pressure gas injection pipes 916 are symmetrically arranged in pairs outside the pressure injection pipe to further improve the water-gas mixing effect.

[0066] Furthermore, the cone angle of the contraction tube 912 is 35-40°, the cone angle of the diffuser tube 914 is 25-35°, and the longitudinal length ratio of the contraction tube 912, the throat tube 913 and the diffuser tube 914 is 1:1:(2-3), which is used to further improve the uniformity of bubble dispersion in the water-air mixture and refine the bubble size.

[0067] Furthermore, the water-air shear disperser 92 includes several tips 921 perpendicular to the flow direction of the bubbles and the water-air mixture, which are used to further enhance the microbubble effect by cutting and dispersing the bubbles through the tips 921.

[0068] Furthermore, the water-air shear disperser 92 includes several spaced-apart, polygonal star-shaped cutting plates, preferably 4 to 8 in number, with the corners of each cutting plate arranged as sharp points 921 in an alternating pattern for easy setup and to further enhance the microbubble effect.

[0069] Furthermore, in the aforementioned flotation device, a water-air distributor is provided between the water-air mixer 9 and several water-air jet guns 8. A valve is provided between the water-air distributor and the water-air jet guns 8 to uniformly distribute microbubbles and water-air mixed fluid to the several water-air jet guns 8 through the water-air distributor, and to control the number of water-air jet guns 8 connected by opening and closing the valve, thereby further realizing flexible adjustment of the water-air flow field and turbulence.

[0070] Furthermore, the water jet gun 8 is rotatably connected to the water jet distributor, which is used to adapt to the angle change of the water jet gun 8 by rotating the connection when adjusting the angle of the jet zone, further facilitating the installation and adjustment of the water jet gun 8 and quickly adjusting the water flow field and turbulence.

[0071] Furthermore, an angle adjuster 804 is provided between the water jet gun 8 and the flotation column 1 for adjusting the radial angle between the jet zone and the circumference of the flotation column 1. The angle adjuster 804 drives the water jet gun 8 to move relative to the flotation column 1, thereby realizing the rapid and flexible adjustment of the radial angle between the jet zone and the circumference of the flotation column 1, and facilitating the adjustment of the water flow field and turbulence.

[0072] Furthermore, the water-air distributor includes a water-air distribution pipe 7 arranged in a ring outside the flotation column 1. The water-air distribution pipe 7 is provided with a number of openings controlled by valves at even intervals. The water-air jet gun 8 includes a vertical pipe 801 and a horizontal square pipe 802 connected together. The openings are connected to the vertical pipe 801 through pipes and rotary joints to realize convenient rotational connection between the water-air jet gun 8 and the water-air distributor.

[0073] Furthermore, the horizontal square pipe 802 is installed on the flotation column 1 and extends vertically into the interior of the flotation column 1, and has a jet zone. The angle adjuster 804 includes an adjustment seat 8041, a knob 8042, and an angle instrument 8043. The adjustment seat 8041 is connected to the flotation column 1 by bolts 8044. The knob 8042 has a rotating shaft 8045 that passes through the adjustment seat 8041 and is connected to the water-air jet gun 8. The rotating shaft 8045 is directly or through a transmission structure connected to the needle shaft of the angle instrument 8043. The knob 8042 is used to drive the horizontal square pipe 802 to reciprocate around the axis of the rotating shaft 8045 on the flotation column 1, and the vertical pipe 801 to reciprocate around the rotating joint 805. The angle is indicated by the angle instrument 8043 as the rotating shaft 8045 rotates, so as to realize convenient adjustment of the angle between the jet zone and the radial direction of the circumference of the flotation column 1.

[0074] Furthermore, an elastic sealing structure 806 is provided between the horizontal square pipe 802 and the flotation column 1, which is used to adapt to the positional changes of the horizontal square pipe 802 in the flotation column 1 and to seal it.

[0075] Furthermore, the water-air jet guns 8 are evenly spaced on the periphery of the flotation column 1, and the number of water-air jet guns 8 is even and not less than 6, in order to further improve the uniformity of the flow field distribution.

[0076] Furthermore, the jet zone includes a fine mesh 803 horizontally arranged at the fluid outlet of the water-air jet gun 8, wherein the area of ​​each individual hole in the fine mesh is 0.04-0.36 mm². 2 The single hole includes a square hole, and the microbubbles and water-air mixture along the water-air jet gun 8 are further dispersed into microbubbles and water columns by the micro-grid 803, which can improve the flotation effect.

[0077] Furthermore, the angle α between the jet zone and the radial direction of the flotation column 1 is 0-45°. Within this angle range, there is a better flow field distribution. If the angle exceeds 45°, the flow field in the central region of the column will be weak. After the feed enters the central region, it will have less contact with the water flow and air bubbles, thus failing to achieve good separation indicators.

[0078] The working principle of the above flotation device is as follows:

[0079] When the fluidized coarse flotation device is working, the pressure water pump 11 draws water from the feed water tank 12 and pressurizes it to generate pressurized water. The high-pressure air tank 13 generates high-pressure gas. The pressurized water and high-pressure gas are respectively introduced into the water-air mixer 9. The high-pressure gas flow from the high-pressure gas jet pipe 916 and the pressurized water flow from the pressurized water jet pipe 915 intersect, causing the gas to partially dissolve into the water by means of pressure. The water-air mixture is initially mixed in the water-air mixing pipe 911 to form a water-air mixed fluid. Then, the water-air mixed fluid passes through the contraction pipe 912, the throat pipe 913 and the diffuser pipe 914 in sequence to form a large number of bubbles. The water-air shear disperser 92, which is composed of polygonal star-shaped staggered arrangement in the diffuser pipe 914, further cuts and disperses the bubbles into microbubbles, improves the degree of bubble dispersion and reduces the bubble size. Finally, a large number of microbubbles and water mixed fluid are formed at the output end of the water-air mixer 9.

[0080] The formed microbubbles and water-air mixture are evenly distributed into the water-air jet gun 8 along the circumference through the water-air distribution pipe 7. The fine mesh 803 of the water-air jet gun 8 further disperses the microbubbles and water-air mixture into microbubbles and water columns. The size of the microbubbles in the water-air mixture sprayed in the jet zone can reach 50-200μm, and the dispersion degree of microbubbles in the water-air mixture can reach more than 80%. This can solve the problem that the generation of bubbles and rising water in the flotation column 1 is relatively simple and crude, and the degree of bubble dispersion and bubble size are difficult to achieve the purpose of microbubble flotation.

[0081] The jet zone extends inside the flotation column 1, causing microbubbles to rise synergistically in the water-air mixture and be sprayed vertically upwards, forming an upward water-air mixture flow field inside the flotation column 1. After the flow field stabilizes, a composite interference bed of microbubbles and water fluidization is formed, which can solve the problem that the existing distribution of bubbles and rising water flow in the flotation column 1 is relatively simple and crude, which is not conducive to the uniform distribution of the interference bed.

[0082] After the slurry and flotation reagents are fully mixed in the mixing tank, they enter the flotation column 1 through the feed pipe 4 and the feed distributor 5, and slowly descend along the entire cross-section of the flotation column 1. The granular ore is floated in the fluidized disturbed bed. The coarse particles containing the target mineral are simultaneously lifted by the buoyancy of the air bubbles and the vertical lift of the rising water flow to become frothy concentrate. The obtained concentrate can be further processed and recovered, while the gangue minerals do not have air bubbles adhering to them, sink and are discharged through the discharge port 6 to become the final tailings. The tailings can be directly used as the final tailings for pre-disposal, completing the flotation separation process.

[0083] Based on the water-air mixer 9 and water-air jet gun 8 facilitating bed uniformity and stability and improving microbubble flotation effect, the angle between the jet zone and the radial direction of the flotation column 1 affects the uniformity of the fluidized interference bed distribution on the cross-section of the flotation column 1, the flow field in the central region, the turbulence intensity, and the bed stability. By freely combining the number and installation angle of the water-air jet gun 8, the problem of the flow field and turbulence intensity being difficult to flexibly adjust due to the use of fixed components as core components in existing bubble and rising water flow distributors can be solved. This enables flexible adjustment of the water-air flow field and turbulence intensity in the fluidized coarse flotation device, which can adapt to the flotation of coarse ore of different types and properties, facilitates the exploration of flotation condition optimization, and greatly shortens the long-cycle R&D process that requires redesigning core fixed components due to poor flotation effect.

[0084] Example 2:

[0085] A preferred embodiment of the fluidized coarse particle flotation method of the present invention, based on the fluidized coarse particle flotation device with adjustable water flow field and turbulence intensity described in Example 1 above, includes the following steps:

[0086] S1: Adjust the number of water-air jet guns 8 connected to the water-air mixer 9 to 8, and the angle between the jet zone and the radial direction of the flotation column 1 to 35°.

[0087] S2: The water-air mixer 9 mixes gas and water into microbubbles and water-air mixed fluid and sends it to each water-air jet gun 8. The water-air jet gun 8 sprays microbubbles and water-air mixed fluid vertically upward inside the flotation column 1 through the jet zone. After the flow field stabilizes, a microbubble and water fluidized composite interference bed is formed.

[0088] S3: Coarse molybdenite particles with a particle size of 0.15-1mm and a molybdenum grade of 0.10% are mixed with kerosene collector at a rate of 100g / t molybdenite, and then pine oil foaming agent at a rate of 20g / t molybdenite is added. After thorough mixing, the slurry is obtained.

[0089] S4: The slurry is fed into the fluidized coarse flotation unit via the feeding device and undergoes flotation in a microbubble and water fluidized composite disturbed bed. The frothy concentrate from the flotation process enters the frothy overflow tank 2 and is discharged through the concentrate discharge port 3 to become the final concentrate, while the tailings sink and are discharged through the discharge port 6 to become the final tailings. The yield of concentrate and tailings, Mo grade, and Mo recovery rate are measured and calculated, and the results are shown in Table 1 below:

[0090] Table 1 Results of fluidized coarse flotation test of molybdenite

[0091]

[0092] As shown in Table 1, the flotation waste rate of coarse particles can reach over 50%, the recovery rate of molybdenite concentrate is over 90%, the grade of the target mineral in the tailings is extremely low, and the molybdenum loss in the tailings is only 7.25%. It can be seen that the present invention is effective and can realize the flotation recovery of coarse molybdenite and the pre-tailing of coarse gangue.

[0093] Example 3:

[0094] A preferred embodiment of the fluidized coarse particle flotation method of the present invention, based on the fluidized coarse particle flotation device with adjustable water flow field and turbulence intensity described in Example 1 above, includes the following steps:

[0095] S1: Adjust the number of water-air jet guns 8 connected to the water-air mixer 9 to 12, and the angle between the jet zone and the radial direction of the flotation column 1 to 28.5°;

[0096] S2: The water-air mixer 9 mixes gas and water into microbubbles and water-air mixed fluid and sends it to each water-air jet gun 8. The water-air jet gun 8 sprays microbubbles and water-air mixed fluid vertically upward inside the flotation column 1 through the jet zone. After the flow field stabilizes, a microbubble and water fluidized composite interference bed is formed.

[0097] S3: Coarse-grained scheelite with a particle size of 0.15-1.1mm and a WO3 content of 0.276% is mixed with sodium carbonate collector and stirred to a pH of 9.5. The amount of sodium carbonate collector added is 600g / t scheelite. Then, a complex collector and pine oil foaming agent are added. The complex collector consists of 550g / t lead nitrate and 500g / t scheelite benzohydroxyxamic acid. The amount of pine oil foaming agent added is 30g / t scheelite. After thorough mixing, the slurry is obtained.

[0098] S4: The slurry is fed into the fluidized coarse flotation unit via the feeding device and undergoes flotation in a microbubble and water fluidized composite disturbed bed. The frothy concentrate from the flotation process enters the frothy overflow tank 2 and is discharged through the concentrate discharge port 3 to become the final concentrate, while the tailings sink and are discharged through the discharge port 6 to become the final tailings. The yield of concentrate and tailings, WO3 grade, and WO3 recovery rate are measured and calculated, and the results are shown in Table 2 below:

[0099] Table 2 Results of fluidized coarse flotation test of scheelite

[0100]

[0101] As shown in Table 2, the flotation waste rate of coarse particles can reach over 50%, the recovery rate of scheelite concentrate is over 85%, the grade of the target mineral in the tailings is extremely low, and the WO3 loss in the tailings is only 13.37%. It can be seen that the present invention is effective and can realize the flotation recovery of coarse scheelite and the pre-tailing of coarse gangue.

[0102] Example 4:

[0103] like Figure 6-7 As shown, this is a preferred embodiment of the fluidized coarse particle flotation device with adjustable water flow field and turbulence intensity according to the present invention. Based on embodiment 1, the flotation device has a damping structure located above the jet zone inside the flotation column 1. The damping structure includes at least two damping rings 10 arranged continuously or at intervals. Multiple damping rings 10 on the inner wall of the flotation column 1 can effectively adjust the fluid turbulence intensity and form a flow field distribution more suitable for coarse particle flotation.

[0104] Furthermore, the damping ring 10 is annular with a hemispherical protrusion on the inner side, which is used to reduce turbulence resistance through the hemispherical protrusion. The damping ring 10 is detachably connected to the flotation column 1 by bolts or the like, which is used to adjust the installation position, number and distribution spacing of the damping rings 10.

[0105] Furthermore, the longitudinal distance from the lowest position of the damping structure to the bottom of the flotation column 1 is ≥1 / 3 of the column's axial height. The number, distribution, and position of the damping rings 10 in the damping structure can interfere with the formation of the bed and further regulate the flow field and turbulence: increasing the number and dense distribution of the damping rings 10 can reduce the turbulence of the flow field in the column and reduce the turbulent resistance of the coarse particles and bubbles adhering and floating, which can promote the floating of coarse particles; if the position of the damping structure is too low, it will affect the formation of the interfering bed too early, which is not conducive to the stability of the bed; if the position is too high, it will not be able to play a role in regulating the turbulence.

[0106] Furthermore, the damping structure is preferably installed in the middle or upper part of the flotation column 1 to further improve the damping effect.

[0107] Example 5:

[0108] A preferred embodiment of the fluidized coarse particle flotation method of the present invention, based on the fluidized coarse particle flotation device with adjustable water flow field and turbulence intensity described in Example 4 above, includes the following steps:

[0109] S1: Adjust the number of water-air jet guns 8 connected to the water-air mixer 9 to 8, the angle between the jet zone and the radial direction of the flotation column 1 to 29°, and the number of damping rings 10 to 3;

[0110] S2: The water-air mixer 9 mixes gas and water into microbubbles and water-air mixed fluid and sends it to each water-air jet gun 8. The water-air jet gun 8 sprays microbubbles and water-air mixed fluid vertically upward inside the flotation column 1 through the jet zone. After the flow field stabilizes, a microbubble and water fluidized composite interference bed is formed.

[0111] S3: Coarse-grained molybdenite with a particle size of 0.2-1.1mm and a molybdenum grade of 0.22% is mixed with kerosene collector at a rate of 180g / t molybdenite, and then pine oil foaming agent at a rate of 30g / t molybdenite is added. After thorough mixing, the slurry is obtained.

[0112] S4: The slurry is fed into the fluidized coarse flotation device via the feeding device and is floated in the microbubble and water fluidized composite interference bed. The frothy concentrate from the flotation enters the frothy overflow tank 2 and is discharged through the concentrate discharge port 3 to become the final concentrate, while the tailings sink and are discharged through the discharge port 6 to become the final tailings.

[0113] Comparative Example 1: A coarse flotation method, which differs from Example 5 in that it uses a conventional mechanical stirring flotation machine to obtain concentrate and tailings.

[0114] The yield, Mo grade, and Mo recovery rate of the concentrate and tailings of Example 5 and Comparative Example 1 were measured and calculated, and the comparison results are shown in Table 3 below:

[0115] Table 3 Comparative flotation test results of molybdenite

[0116]

[0117]

[0118] As shown in Table 3, the coarse particle flotation waste rate of Example 5 can reach more than 50%, and the molybdenite concentrate recovery rate is more than 90%, while the Mo recovery rate of the coarse concentrate in Comparative Example 1 is only 39.70%. Moreover, the grade of the target mineral in the tailings of Example 5 is extremely low, and the molybdenum loss in the tailings is only 8.15%. It can be seen that the present invention is effective and can realize the flotation recovery of coarse molybdenite and the pre-tailing of coarse gangue.

[0119] Example 6:

[0120] A preferred embodiment of the fluidized coarse particle flotation method of the present invention, based on the fluidized coarse particle flotation device with adjustable water flow field and turbulence intensity described in Example 4 above, includes the following steps:

[0121] S1: Adjust the number of water-air jet guns 8 connected to the water-air mixer 9 to 10, the angle between the jet zone and the radial direction of the flotation column 1 to 22°, and the number of damping rings 10 to 2;

[0122] S2: The water-air mixer 9 mixes gas and water into microbubbles and water-air mixed fluid and sends it to each water-air jet gun 8. The water-air jet gun 8 sprays microbubbles and water-air mixed fluid vertically upward inside the flotation column 1 through the jet zone. After the flow field stabilizes, a microbubble and water fluidized composite interference bed is formed.

[0123] S3: Coarse-grained scheelite with a particle size of 0.18-1.0mm and a WO3 content of 0.17% is mixed with sodium carbonate collector and stirred to a pH of 9.5. The amount of sodium carbonate collector added is 480g / t scheelite. Then, a complex collector and pine oil foaming agent are added. The complex collector consists of 600g / t lead nitrate and 600g / t scheelite benzyl hydroxamic acid. The amount of pine oil foaming agent added is 40g / t scheelite. After thorough mixing, the slurry is obtained.

[0124] S4: The slurry is fed into the fluidized coarse flotation device via the feeding device and is floated in the microbubble and water fluidized composite interference bed. The frothy concentrate from the flotation enters the frothy overflow tank 2 and is discharged through the concentrate discharge port 3 to become the final concentrate, while the tailings sink and are discharged through the discharge port 6 to become the final tailings.

[0125] Comparative Example 2: A coarse flotation method, which differs from Example 6 in that it uses a conventional mechanical stirring flotation machine to obtain concentrate and tailings.

[0126] The yield, WO3 grade, and WO3 recovery rate of the concentrate and tailings of Example 6 and Comparative Example 2 were measured and calculated, and the comparison results are shown in Table 4 below:

[0127] Table 4 Comparative flotation test results of scheelite

[0128]

[0129]

[0130] As shown in Table 4, Example 6 achieves a coarse particle flotation waste rate of over 50% and a scheelite concentrate recovery rate of over 85%, while the WO3 recovery rate of the coarse concentrate in Comparative Example 1 is only 41.69%. Furthermore, the tailings of Example 6 contain extremely low grades of the target mineral, with only 10.80% WO3 loss in the tailings. This demonstrates that the present invention is highly effective and can achieve flotation recovery of coarse scheelite and pre-tailing of coarse gangue.

[0131] In summary, this invention achieves flexible adjustment of the water flow field and turbulence intensity within the fluidized coarse flotation device. By using a water-air mixer 9 and a water-air jet gun 8 to form a fully mixed microbubble-water water-air fluid, the flotation effect of the water-air fluid on coarse particles is enhanced. This enables the flotation recovery of coarse minerals with a particle size of approximately 0.1-1.2 mm. It exhibits excellent separation effects for sulfide ores such as molybdenite and lead-zinc ore, as well as oxide ores such as scheelite, cassiterite, and ilmenite. The coarse particle flotation waste rate can reach over 50%, the sulfide ore concentrate recovery rate is over 90%, and the oxide ore concentrate recovery rate is over 85%, achieving the flotation recovery of coarse target minerals. Simultaneously, the tailings contain extremely low-grade target minerals and can be directly discarded as final tailings in the "grind-flotation" beneficiation process, promptly removing gangue minerals from the process. This reduces the load on the ball mill and the processing volume of the flotation process, significantly reducing energy consumption and meeting application requirements.

[0132] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present invention and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention, and all other embodiments obtained without creative effort, should be included within the scope of protection of the present invention.

Claims

1. A fluidized coarse particle flotation device with adjustable water flow field and turbulence intensity, characterized in that, It includes a flotation column (1), a connected water-air mixer (9) and several water-air jet guns (8). The top of the flotation column (1) is provided with a foam overflow trough (2), a concentrate discharge port (3) and a feeding device, and the bottom of the flotation column (1) is provided with a discharge port (6). A water-air mixer (9) is connected to several water-air jet guns (8) via a water-air distributor. The water-air jet guns (8) are rotatably connected to the water-air distributor. A valve is provided between the water-air distributor and the water-air jet guns (8). An angle adjuster (804) is provided between the water-air jet guns (8) and the flotation column (1) for adjusting the radial angle between the jet zone and the circumference of the flotation column (1). The water-air jet guns (8) are provided with a jet zone extending into the flotation column (1) for vertically spraying microbubbles and water-air mixed fluid upwards. The water-air jet guns (8) can adjust the angle between the jet zone and the flotation column (1). 1) The included angle of the circumferential radial direction; the water-air distributor includes a water-air distribution pipe (7) arranged in a ring outside the flotation column (1), the water-air distribution pipe (7) is evenly spaced with a number of openings controlled by valves, the water-air jet gun (8) includes a vertical pipe (801) and a horizontal square pipe (802) connected together, the opening is connected to the vertical pipe (801) through the pipe and the rotary joint to realize the convenient rotational connection between the water-air jet gun 8 and the water-air distributor; the horizontal square pipe (802) is arranged on the flotation column (1) and extends vertically into the interior of the flotation column (1) and is provided with a jet zone.

2. The fluidized coarse particle flotation device with adjustable water flow field and turbulence intensity according to claim 1, characterized in that, The middle and upper parts of the flotation column (1) are cylindrical, and the lower part of the flotation column (1) is conical. The longitudinal length ratio of the cylinder to the cone is (2.5-3.5):

1. The angle between the cone wall and the vertical axis is 40-50°. The jet zone is close to the junction area of ​​the cylinder and the cone.

3. The fluidized coarse particle flotation device with adjustable water flow field and turbulence intensity according to claim 1, characterized in that, The water-air mixer (9) includes a housing (91) and a water-air shear disperser (92). The housing (91) includes, in sequence along the fluid input to output direction, a water-air mixing pipe (911), a contraction pipe (912), a throat pipe (913), and a diffuser pipe (914). The water-air mixing pipe (911) is provided with a pressurized water jet pipe (915) extending into the interior of the water-air mixing pipe (911) and several high-pressure gas jet pipes (916). The high-pressure gas flow of the high-pressure gas jet pipe (916) can intersect with the pressurized water flow of the pressurized water jet pipe (915) to form a water-air mixed fluid. The water-air shear disperser (92) is located inside the diffuser pipe (914) and includes several tips (921) perpendicular to the flow direction of the bubbles and the water-air mixed fluid.

4. The fluidized coarse particle flotation device with adjustable water flow field and turbulence intensity according to claim 3, characterized in that, The converging tube (912) has a cone angle of 35-40°, the diffuser tube (914) has a cone angle of 25-35°, the longitudinal length ratio of the converging tube (912), the throat tube (913) and the diffuser tube (914) is 1:1:(2~3), the pressurized water jet tube (915) is provided with a conical nozzle with a cone angle of 20-30°, the high-pressure gas jet tube (916) is provided with a conical nozzle with a cone angle of 20-25°, and the fluid jet angle between the pressurized water jet tube (915) and the high-pressure gas jet tube (916) is 30-55°.

5. The fluidized coarse particle flotation device with adjustable water flow field and turbulence intensity according to claim 1, characterized in that, The jet zone includes a fine mesh (803) horizontally arranged at the fluid outlet of the water-air jet gun (8), wherein the area of ​​each individual hole in the fine mesh is 0.04-0.36 mm². 2 The angle α between the jet zone and the radial direction of the flotation column (1) is 0-45°.

6. The fluidized coarse particle flotation device with adjustable water flow field and turbulence intensity according to claim 1, characterized in that, The flotation column (1) is provided with a damping structure located above the jet zone. The damping structure includes at least two damping rings (10) arranged continuously or at intervals. The longitudinal distance from the lowest position of the damping structure to the bottom of the flotation column (1) is ≥ 1 / 3 of the column's axial height.

7. A fluidized bed coarse particle flotation method, characterized in that, The fluidized coarse flotation device with adjustable water flow field and turbulence intensity according to any one of claims 1 to 6, the method comprising: Adjust the number of water jet guns (8) of the water-air mixer (9) and the angle between the jet zone and the radial direction of the flotation column (1); The water-air mixer (9) mixes gas and water into a microbubble and water-air mixture fluid and sends it to each water-air jet gun (8). The water-air jet gun (8) sprays the microbubble and water-air mixture fluid vertically upward inside the flotation column (1) through the jet zone. After the flow field stabilizes, a microbubble and water fluidized composite interference bed is formed. After the coarse slurry is conditioned, it is floated in a microbubble and water fluidized composite interference bed by a feeding device. The foam concentrate enters the foam overflow tank (2) and is discharged through the concentrate discharge port (3) to become the final concentrate, while the tailings sink and are discharged through the discharge port (6) to become the final tailings.

8. The fluidized bed coarse particle flotation method according to claim 7, characterized in that, The microbubbles ejected in the jet zone and the water-air mixture have a microbubble size of 50-200 μm and a microbubble dispersion of over 80% in the water-air mixture.

9. The fluidized bed coarse particle flotation method according to claim 7, characterized in that, The coarse-grained minerals in the coarse-grained slurry have a particle size of 0.1-1.2 mm, including sulfide minerals and oxide minerals.

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