Pneumatic selective circulating flotation column in middling pillar

Abstract

The invention belongs to the technical field of mineral separation, and particularly relates to a pneumatic selective circulating flotation column in a middling pillar. The pneumatic selective circulating flotation column comprises a feeding part, the upper portion of the feeding part communicates with a rough separation section pipe body, the lower portion of the feeding part communicates with a scavenging section pipe body, the lower portion of the scavenging section pipe body communicates with a middling pneumatic circulating barrel, and the lower portion of the middling pneumatic circulating barrel communicates with a concentration cone; a false bottom and a bubble dispersing assembly are coaxially arranged in the pneumatic middling circulating barrel, the false bottom is close to the top end of the pneumatic middling circulating barrel, the false bottom is arranged to be in an inverted conical barrel shape, the bubble dispersing assembly penetrates into the false bottom, a first gap is reserved between the bubble dispersing assembly and the false bottom, and a second gap is reserved between the bubble dispersing assembly and the pneumatic middling circulating barrel. The bubble dispersing assembly communicates with an air inlet pipe, and the air inlet pipe penetrates out of the middling pneumatic circulating cylinder. The device is free of external equipment, short in circulation path, long in ore pulp retention time, good in separation effect, suitable for recycling of fine-grained minerals and has the advantages of being low in energy consumption and high in efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of mineral processing, and in particular relates to a pneumatic selective circulation flotation column in a mid-ore column. Background Art

[0002] Flotation columns are highly efficient equipment for separating fine-grained minerals, offering advantages such as a small footprint, simple structure, and high flotation speeds. Conventional flotation columns typically consist of a feeder, slurry distributor, bubble generator, tailings pipe, and flushing device. The separation process relies on the adhesion efficiency between mineral particles and bubbles, and the separation effect can be optimized by adjusting parameters such as aeration volume, foam layer height, and flushing water flow.

[0003] In the prior art, when a flotation column without middlings circulation is used, the middlings are not circulated, resulting in loss of incompletely sorted particles and a low recovery rate; while a flotation column with external circulation is complex in system and consumes a lot of energy.

[0004] Therefore, a pneumatic selective circulation flotation column in a mid-column is proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide a pneumatic selective circulation flotation column in a mid-column to solve the above problems.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] A pneumatic selective circulation flotation column in a middling column, comprising: a feed section, wherein the feed section is connected to a roughing section pipe body above the feed section, and is connected to a scavenging section pipe body below the feed section, and is connected to a middling pneumatic circulation cylinder below the scavenging section pipe body, and is connected to a concentrating cone below the middling pneumatic circulation cylinder, wherein the roughing section pipe body, the scavenging section pipe body, the middling pneumatic circulation cylinder, and the concentrating cone are coaxially arranged;

[0008] A false bottom and a bubble dispersion component are coaxially arranged in the Zhongkuang pneumatic circulation cylinder. The false bottom is close to the top of the Zhongkuang pneumatic circulation cylinder. The false bottom is arranged in an inverted cone shape. The bubble dispersion component penetrates into the false bottom and leaves a first gap between the false bottom and the bubble dispersion component. A second gap is left between the bubble dispersion component and the Zhongkuang pneumatic circulation cylinder. The bubble dispersion component is connected to an air intake pipe, and the air intake pipe passes through the Zhongkuang pneumatic circulation cylinder.

[0009] In the pneumatic selective circulation flotation column in the mid-ore column of the present invention, the bubble dispersion component includes a mounting tube, the mounting tube is coaxially fixed in the mid-ore pneumatic circulation cylinder, the top end of the mounting tube extends into the false bottom, a second gap is left between the mounting tube and the mid-ore pneumatic circulation cylinder, a first gap is left between the mounting tube and the false bottom, the top end of the mounting tube is coaxially fixed with a mounting base, the mounting base is located in the mounting tube, and a bubble dispersion structure, a plurality of rotating guide plates and a plurality of vertical guide plates are fixed to the outer wall of the mounting base in sequence from top to bottom, the plurality of rotating guide plates and the plurality of vertical guide plates are circumferentially arranged at equal intervals and correspond one to one, and the rotating guide plates are fixed to the vertical guide plates;

[0010] The bubble dispersion structure includes a plurality of bubble dispersion columns fixedly connected to the outer wall of the installation base. The plurality of bubble dispersion columns are divided into several layers from bottom to top, and the plurality of bubble dispersion columns in the same layer are arranged at equal intervals in the circumferential direction.

[0011] In the pneumatic selective circulation flotation column in the mid-column of the present invention, a circulation pipe is coaxially fixed to the bottom end of the mounting pipe, the circulation pipe is fixedly connected to and communicated with the air inlet pipe, the air outlet end of the air inlet pipe is located in the circulation pipe and is arranged vertically upward, the bottom end of the circulation pipe is coaxially fixed to a base, the base is arranged in a conical cylindrical shape, and the bottom end of the base extends into the concentration cone.

[0012] In the pneumatic selective circulation flotation column in the mid-ore column of the present invention, the mid-ore pneumatic circulation cylinder is connected to an overflow pipe, and the overflow pipe is arranged corresponding to the false bottom.

[0013] In the pneumatic selective circulation flotation column in the mid-column of the present invention, a first flow stabilizing plate is coaxially fixed to the roughing section tube body, the first flow stabilizing plate is located in the middle of the roughing section tube body, a first guide cone is coaxially fixed to the first flow stabilizing plate, a plurality of first through holes are opened on the first flow stabilizing plate, and the plurality of first through holes are distributed in an array.

[0014] In the pneumatic selective circulation flotation column in the mid-column of the present invention, a second flow stabilizing plate is coaxially fixedly connected to the scavenging section tube body, the second flow stabilizing plate is close to the top end of the scavenging section tube body, a second guide cone is coaxially fixedly connected to the second flow stabilizing plate, and a plurality of second through holes are opened on the second flow stabilizing plate, and the plurality of second through holes are distributed in an array.

[0015] In the pneumatic selective circulation flotation column in the middle ore column of the present invention, the top end of the coarse selection section tube body is set to be conical, the top end of the coarse selection section tube body is fixedly connected to and connected with a first foam tank, the bottom surface of the first foam tank is set at an angle, and the side wall of the first foam tank is fixedly connected to and connected with a first foam outlet, and the first foam outlet is located at the bottom end of the first foam tank.

[0016] In the pneumatic selective circulation flotation column in the mid-column of the present invention, the feed part includes a feed bin, which is coaxially arranged with the roughing section tube body, and a first annular channel and a first conical channel are coaxially opened in the feed bin, the first annular channel is connected with a feed pipe, the feed pipe is tangent to the first annular channel, the width of the first annular channel is gradually widened from top to bottom, the first conical channel is set to an inverted cone shape and the top end is connected to the first annular channel, the first annular channel is connected to the roughing section tube body, and the first conical channel is connected to the scavenging section tube body.

[0017] In the pneumatic selective circulation flotation column in the mid-column of the present invention, the feed part includes a feed bin, which is coaxially arranged with the roughing section pipe body, and an annular cavity is coaxially opened in the feed bin, and the annular cavity is connected with a feed pipe, and the feed pipe is tangent to the annular cavity, and the annular cavity is connected with the roughing section pipe body and the scavenging section pipe body.

[0018] In the pneumatic selective circulation flotation column in the mid-column of the present invention, the feed part includes a feed bin, which is coaxially arranged with the roughing section tube body, and a second annular channel and a second conical channel are coaxially opened in the feed bin, the second annular channel is connected with a feed pipe, the feed pipe is tangent to the second annular channel, the second annular channel is connected with a feed pipe, the feed pipe is tangent to the second annular channel, the width of the second annular channel is gradually widened from bottom to top, the second conical channel is set to be conical and the bottom end is connected to the second annular channel, the second conical channel is connected to the roughing section tube body, and the second annular channel is connected to the scavenging section tube body.

[0019] Compared with the prior art, the present invention has the following advantages and technical effects:

[0020] In the present invention, the raw ore is introduced into the feed section after being doped and mineralized. The hydrophobic particles adhered to bubbles move upward under the action of buoyancy and enter the coarse selection section tube body, while the particles without bubbles adhered to bubbles sink and enter the scavenging section tube body. The particles with good hydrophobicity collide and adhere with bubbles from below, become mineralized bubbles and rise in turn, while the particles without bubbles adhere to bubbles continue to sink under the action of gravity. The setting of the false bottom can slow down the sinking speed of the particles and increase the residence time of the particles in the scavenging section tube body. Then the mineral particles enter the concentrating cone and form stratification with increasing density from bottom to top in the concentrating cone.

[0021] The air inlet pipe ventilates the bubble dispersion component, which disperses the air flow into small bubbles, making it easier for them to adhere to hydrophobic mineral particles. At the same time, negative pressure is formed below the bubble dispersion component, which draws the material in the middle of the concentration cone into the bubble dispersion component, where it adheres to the tiny bubbles and rises under the action of the bubbles until it overflows from the top of the coarse selection section pipe.

[0022] The present invention has no external equipment, a short circulation path, a long slurry residence time, a good sorting effect, is suitable for the recovery of fine-grained minerals, and has the advantages of low energy consumption and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work.

[0024] Figure 1 It is the front view of the present invention;

[0025] Figure 2 It is a structural schematic diagram of the present invention;

[0026] Figure 3 This is a schematic diagram of the structure of the pneumatic circulation cylinder of the mine in the present invention;

[0027] Figure 4 Schematic diagram of the structure of the bubble dispersion component of the present invention;

[0028] Figure 5 This is a schematic structural diagram of Example 2 of the present invention;

[0029] Figure 6 This is a schematic structural diagram of Example 3 of the present invention;

[0030] Figure 7 This is a schematic structural diagram of Example 4 of the present invention;

[0031] Among them, 1. first foam trough; 101. first foam outlet; 2. coarse selection section pipe body; 3. first flow stabilizer; 301. first through hole; 302. first guide cone; 4. feed bin; 401. first annular channel; 402. first conical channel; 403. annular cavity; 404. second annular channel; 405. second conical channel; 5. feed pipe; 6. scavenging section pipe body; 7. pneumatic circulation cylinder for mid-ore mining; 8. concentration cone; 9. air inlet pipe; 10. overflow pipe; 11. second flow stabilizer; 1101. second through hole; 1102. second guide cone; 12. base; 13. circulation pipe; 14. installation pipe; 15. false bottom; 16. vertical guide plate; 17. rotating guide plate; 18. bubble dispersion column; 19. installation base; 20. second foam trough; 2001. second foam outlet. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Example 1

[0035] Reference Figures 1 to 4 This embodiment discloses a pneumatic selective circulation flotation column for middling ore in a column, comprising: a feed section, wherein the upper portion of the feed section is connected to a roughing section pipe body 2, the lower portion of the feed section is connected to a scavenging section pipe body 6, the lower portion of the scavenging section pipe body 6 is connected to a middling ore pneumatic circulation cylinder 7, the lower portion of the middling ore pneumatic circulation cylinder 7 is connected to a concentrating cone 8, and the roughing section pipe body 2, the scavenging section pipe body 6, the middling ore pneumatic circulation cylinder 7, and the concentrating cone 8 are coaxially arranged;

[0036] The concentrating cone 8 is configured as an inverted cone;

[0037] A false bottom 15 and a bubble dispersion component are coaxially arranged in the Zhongkuang pneumatic circulation cylinder 7. The false bottom 15 is close to the top of the Zhongkuang pneumatic circulation cylinder 7. The false bottom 15 is arranged in an inverted cone shape. The bubble dispersion component passes into the false bottom 15 and a first gap is left between the bubble dispersion component and the false bottom 15. A second gap is left between the bubble dispersion component and the Zhongkuang pneumatic circulation cylinder 7. The bubble dispersion component is connected to the air intake pipe 9, and the air intake pipe 9 passes through the Zhongkuang pneumatic circulation cylinder 7.

[0038] The flotation column of the present invention has multiple functions such as flotation roughing, flotation sweeping, hydraulic classification, gravity separation, middling recycling and reselection, and foam layer selection.

[0039] In the present invention, after being doped and mineralized, the raw ore is introduced into the feed section. Hydrophobic particles adhered to bubbles move upward under the action of buoyancy and enter the coarse section pipe body 2. Particles not adhered to bubbles sink and enter the scavenging section pipe body 6. Particles with good hydrophobicity collide and adhere with bubbles from below, becoming mineralized bubbles and rising. Particles not adhered to bubbles continue to sink under the action of gravity. The provision of the false bottom 15 can slow down the sinking speed of the particles and increase the residence time of the particles in the scavenging section pipe body 6. Then, the mineral particles enter the concentrating cone 8, and produce stratification with increasing density from bottom to top in the concentrating cone 8. Fine-grained medium ore and water are discharged through the overflow pipe 10, and heavy products are discharged through the underflow port at the bottom end of the concentrating cone 8.

[0040] The air inlet pipe 9 ventilates the bubble dispersion component, which disperses the air flow into small bubbles, making it easier for the air to adhere to the hydrophobic mineral particles. At the same time, negative pressure is formed below the bubble dispersion component, which draws the material in the middle of the concentration cone 8 into the bubble dispersion component, adheres to the tiny bubbles, and rises under the action of the bubbles until it overflows from the top of the coarse selection section pipe body 2.

[0041] The present invention has no external equipment, a short circulation path, a long slurry residence time, a good sorting effect, is suitable for the recovery of fine-grained minerals, and has the advantages of low energy consumption and high efficiency.

[0042] In an implementable solution, the bubble dispersion component includes a mounting tube 14, which is coaxially fixed in the pneumatic circulation cylinder 7 of the middle mine, and the top end of the mounting tube 14 extends into the false bottom 15. A second gap is left between the mounting tube 14 and the pneumatic circulation cylinder 7 of the middle mine, and a first gap is left between the mounting tube 14 and the false bottom 15. The top end of the mounting tube 14 is coaxially fixed with a mounting base 19, and the mounting base 19 is located in the mounting tube 14. The outer wall of the mounting base 19 is fixed with a bubble dispersion structure, a plurality of rotating guide plates 17, and a plurality of vertical guide plates 16 in sequence from top to bottom. The plurality of rotating guide plates 17 and the plurality of vertical guide plates 16 are circumferentially arranged at equal intervals and correspond one to one, and the rotating guide plates 17 are fixed to the vertical guide plates 16;

[0043] The bubble dispersion structure includes a plurality of bubble dispersion columns 18 fixed to the outer wall of the mounting base 19. The plurality of bubble dispersion columns 18 are divided into several layers from bottom to top, and the plurality of bubble dispersion columns 18 in the same layer are arranged at equal intervals in the circumferential direction.

[0044] The air inlet pipe 9 ventilates the mounting pipe 14. The gas rises under the action of the vertical guide plate 16 and the swirl guide plate 17 and is dispersed into small bubbles under the action of the bubble dispersion column 18, which is convenient for adhering to the mineral particles with good hydrophobicity. At the same time, negative pressure is formed under the bubble dispersion column 18 to suck the material and the additional agent in the middle of the concentration cone 8 into the mounting pipe 14, adhere to the tiny bubbles and rise under the action of the bubbles until it overflows from the top of the coarse selection section pipe body.

[0045] In an implementable solution, the bottom end of the mounting tube 14 is coaxially fixed with a circulation tube 13, the circulation tube 13 is fixedly connected to and communicated with the air inlet tube 9, the air outlet end of the air inlet tube 9 is located in the circulation tube 13 and is arranged vertically upward, the bottom end of the circulation tube 13 is coaxially fixed with a base 12, the base 12 is arranged in a conical cylindrical shape, and the bottom end of the base 12 extends into the concentration cone 8.

[0046] Compressed air or high-pressure air flows into the circulation pipe 13 through the air inlet pipe 9, and the air outlet end of the air inlet pipe 9 is set vertically upward. The airflow passes through the vertical guide plate 16 and then the rotating guide plate 17 to generate a vortex, and finally passes through multiple bubble dispersion columns 18 to be dispersed into tiny bubbles, and then discharged through the top of the mounting pipe 14.

[0047] During this process, negative pressure is generated below the circulation pipe 13, sucking the liquid and fine particles into the installation pipe 14, and tiny bubbles mix and adhere to the fine particles. The fine particles rise under the action of the tiny bubbles until they overflow from the top of the coarse selection section pipe body 2.

[0048] In an implementable solution, the mid-mine pneumatic circulation cylinder 7 is connected to an overflow pipe 10 , and the overflow pipe 10 is provided corresponding to the false bottom 15 .

[0049] As heavy particles settle into the concentrating cone 8, the interface of the concentrating cone 8 gradually decreases, the flow cross-section decreases, and the water and finer particles will turn to move obliquely upward and peripherally under the obstruction of the cone surface, and flow out from the overflow pipe 10 at the top of the concentrating cone 8 to become overflow.

[0050] In an implementable solution, a first flow stabilizing plate 3 is coaxially fixed inside the coarse selection section tube body 2, the first flow stabilizing plate 3 is located in the middle of the coarse selection section tube body 2, a first guide cone 302 is coaxially fixed on the first flow stabilizing plate 3, and a plurality of first through holes 301 are opened on the first flow stabilizing plate 3, and the plurality of first through holes 301 are distributed in an array.

[0051] In an implementable solution, a second flow stabilizing plate 11 is coaxially fixed inside the scanning section tube body 6, the second flow stabilizing plate 11 is close to the top of the scanning section tube body 6, a second guide cone 1102 is coaxially fixed on the second flow stabilizing plate 11, and a plurality of second through holes 1101 are opened on the second flow stabilizing plate 11, and the plurality of second through holes 1101 are distributed in an array.

[0052] In an implementable solution, the top end of the coarse selection section tube body 2 is configured to be conical, the top end of the coarse selection section tube body 2 is fixedly connected to and connected with the first foam groove 1, the bottom surface of the first foam groove 1 is configured to be inclined, and the side wall of the first foam groove 1 is fixedly connected to and connected with the first foam outlet 101, and the first foam outlet 101 is located at the bottom end of the first foam groove 1.

[0053] Foam and fine particles enter the first foam groove 1 and then flow out along the first foam outlet 101 .

[0054] In an implementable scheme, the feeding part includes a feeding bin 4, which is coaxially arranged with the coarse selection section tube body 2, and a first annular channel 401 and a first conical channel 402 are coaxially opened in the feeding bin 4, the first annular channel 401 is connected with a feeding pipe 5, the feeding pipe 5 is tangent to the first annular channel 401, the width of the first annular channel 401 is gradually widened from top to bottom, the first conical channel 402 is arranged to be an inverted cone shape and the top end is connected to the first annular channel 401, the first annular channel 401 is connected with the coarse selection section tube body 2, and the first conical channel 402 is connected with the scavenging section tube body 6.

[0055] The raw ore enters the first annular channel 401 of the feed bin 4 through the feed pipe 5, and the feed pipe 5 is tangent to the first annular channel 401, so that the mineral has a rotational force after entering the feed bin 4. At the same time, the width of the first annular channel 401 is gradually widened from top to bottom, and the first conical channel 402 is set to an inverted cone shape and the top end is connected to the first annular channel 401, so that the feed vortex is accelerated downward.

[0056] In addition, a dosing pipe (not shown in the figure) is connected to the side wall of the pneumatic circulation cylinder 7 of the intermediate mine. The dosing pipe extends into the circulation pipe 13 and is used to add reagents into the circulation pipe 13.

[0057] Example 2

[0058] Reference Figure 5 The difference between this embodiment and embodiment 1 is that the feeding part includes a feeding bin 4, which is coaxially arranged with the coarse selection section pipe body 2, and an annular cavity 403 is coaxially opened in the feeding bin 4, the annular cavity 403 is connected with the feeding pipe 5, the feeding pipe 5 is tangent to the annular cavity 403, and the annular cavity 403 is connected with the coarse selection section pipe body 2 and the scavenging section pipe body 6.

[0059] The raw ore rotates through the feed pipe 5 and enters the annular cavity 403 of the feed bin 4 .

[0060] Example 3

[0061] Reference Figure 6The difference between this embodiment and embodiment 1 and embodiment 2 is that the feeding part includes a feeding bin 4, which is coaxially arranged with the roughing section pipe body 2, and a second annular channel 404 and a second conical channel 405 are coaxially opened in the feeding bin 4, the second annular channel 404 is connected with a feeding pipe 5, the feeding pipe 5 is tangent to the second annular channel 404, the width of the second annular channel 404 is gradually widened from bottom to top, the second conical channel 405 is configured to be conical and the bottom end is connected to the second annular channel 404, the second conical channel 405 is connected with the roughing section pipe body 2, and the second annular channel 404 is connected with the scavenging section pipe body 6.

[0062] The raw ore enters the second annular channel 404 of the feed bin 4 through the feed pipe 5, and the feed pipe 5 is tangent to the second annular channel 404, so that the mineral has a rotational force after entering the feed bin 4. At the same time, the width of the second annular channel 404 is gradually widened from bottom to top, and the second conical channel 405 is set to be conical and the bottom end is connected to the second annular channel 404, so that the feed vortex is accelerated upward.

[0063] Example 4

[0064] Reference Figure 7 The difference between this embodiment and embodiment 1 is that the top of the first foam groove 1 is set to be conical, the top of the first foam groove 1 is connected to the second foam groove 20, and the outer wall of the second foam groove 20 is fixedly connected to and connected with a second foam outlet 2001, and the second foam outlet 2001 is located at the bottom end of the second foam groove 20.

[0065] A second foam tank 20 and a first foam tank 1 are provided to collect minerals of different particle sizes separately.

[0066] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0067] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A pneumatic selective circulation flotation column in a mid-column, characterized in that: include: A feeding section, wherein the upper portion of the feeding section is connected to a coarse selection section pipe body (2), the lower portion of the feeding section is connected to a scavenging section pipe body (6), the lower portion of the scavenging section pipe body (6) is connected to a mid-ore pneumatic circulation cylinder (7), the lower portion of the mid-ore pneumatic circulation cylinder (7) is connected to a concentration cone (8), and the coarse selection section pipe body (2), the scavenging section pipe body (6), the mid-ore pneumatic circulation cylinder (7) and the concentration cone (8) are coaxially arranged; A false bottom (15) and a bubble dispersion component are coaxially arranged in the pneumatic circulation cylinder (7) of the middle mine. The false bottom (15) is close to the top of the pneumatic circulation cylinder (7) of the middle mine. The false bottom (15) is arranged in an inverted cone shape. The bubble dispersion component penetrates into the false bottom (15) and a first gap is left between the bubble dispersion component and the false bottom (15). A second gap is left between the bubble dispersion component and the pneumatic circulation cylinder (7) of the middle mine. The bubble dispersion component is connected to an air inlet pipe (9), and the air inlet pipe (9) passes through the pneumatic circulation cylinder (7) of the middle mine.

2. The pneumatic selective circulation flotation column in the mid-column according to claim 1, characterized in that: The bubble dispersion component includes a mounting tube (14), the mounting tube (14) is coaxially fixed in the pneumatic circulation cylinder (7) of the middle mine, the top end of the mounting tube (14) extends into the false bottom (15), a second gap is left between the mounting tube (14) and the pneumatic circulation cylinder (7) of the middle mine, a first gap is left between the mounting tube (14) and the false bottom (15), the top end of the mounting tube (14) is coaxially fixed with a mounting base (19), the mounting base (19) is located in the mounting tube (14), and a bubble dispersion structure, a plurality of rotating guide plates (17) and a plurality of vertical guide plates (16) are fixed on the outer wall of the mounting base (19) in sequence from top to bottom, the plurality of rotating guide plates (17) and the plurality of vertical guide plates (16) are all arranged at equal intervals in the circumferential direction and correspond one to one, and the rotating guide plates (17) are fixed to the vertical guide plates (16); The bubble dispersion structure includes a plurality of bubble dispersion columns (18) fixed to the outer wall of the installation base (19), the plurality of bubble dispersion columns (18) are divided into several layers from bottom to top, and the plurality of bubble dispersion columns (18) located in the same layer are arranged at equal intervals in the circumferential direction.

3. The pneumatic selective circulation flotation column in the mid-column according to claim 2, characterized in that: The bottom end of the mounting tube (14) is coaxially fixedly connected to a circulation tube (13), the circulation tube (13) is fixedly connected to and communicated with the air inlet tube (9), the air outlet end of the air inlet tube (9) is located in the circulation tube (13) and is vertically arranged upwards, the bottom end of the circulation tube (13) is coaxially fixedly connected to a base (12), the base (12) is arranged in a conical cylindrical shape, and the bottom end of the base (12) extends into the concentrating cone (8).

4. The pneumatic selective circulation flotation column in the mid-column according to claim 2, characterized in that: The intermediate ore pneumatic circulation cylinder (7) is connected to an overflow pipe (10), and the overflow pipe (10) is arranged corresponding to the false bottom (15).

5. The pneumatic selective circulation flotation column in the mid-column according to claim 1, characterized in that: A first flow stabilizing plate (3) is coaxially fixedly connected to the rough selection section tube body (2); the first flow stabilizing plate (3) is located in the middle of the rough selection section tube body (2); a first flow guide cone (302) is coaxially fixedly connected to the first flow stabilizing plate (3); a plurality of first through holes (301) are formed on the first flow stabilizing plate (3); and the plurality of first through holes (301) are distributed in an array.

6. The pneumatic selective circulation flotation column in the mid-column according to claim 1, characterized in that: A second flow stabilizing plate (11) is coaxially fixedly connected to the inside of the scanning section tube body (6), the second flow stabilizing plate (11) is close to the top end of the scanning section tube body (6), a second flow guide cone (1102) is coaxially fixedly connected to the second flow stabilizing plate (11), and a plurality of second through holes (1101) are provided on the second flow stabilizing plate (11), and the plurality of second through holes (1101) are distributed in an array.

7. The pneumatic selective circulation flotation column in the mid-column according to claim 1, characterized in that: The top end of the coarse selection section tube body (2) is configured to be conical, the top end of the coarse selection section tube body (2) is fixedly connected to and communicated with a first foam groove (1), the bottom surface of the first foam groove (1) is configured to be inclined, the side wall of the first foam groove (1) is fixedly connected to and communicated with a first foam outlet (101), and the first foam outlet (101) is located at the bottom end of the first foam groove (1).

8. The pneumatic selective circulation flotation column in the mid-column according to claim 1, characterized in that: The feeding part comprises a feeding bin (4), the feeding bin (4) and the roughing section pipe body (2) are coaxially arranged, a first annular channel (401) and a first conical channel (402) are coaxially opened in the feeding bin (4), the first annular channel (401) is connected to a feeding pipe (5), the feeding pipe (5) is tangent to the first annular channel (401), the width of the first annular channel (401) is gradually widened from top to bottom, the first conical channel (402) is set to be an inverted cone shape and the top end is connected to the first annular channel (401), the first annular channel (401) is connected to the roughing section pipe body (2), and the first conical channel (402) is connected to the scavenging section pipe body (6).

9. The pneumatic selective circulation flotation column in the mid-column according to claim 1, characterized in that: The feeding section comprises a feeding bin (4), the feeding bin (4) being coaxially arranged with the roughing section pipe body (2), an annular cavity (403) being coaxially opened in the feeding bin (4), the annular cavity (403) being connected with a feeding pipe (5), the feeding pipe (5) being tangent to the annular cavity (403), and the annular cavity (403) being connected with the roughing section pipe body (2) and the scavenging section pipe body (6).

10. The pneumatic selective circulation flotation column in the mid-column according to claim 1, characterized in that: The feeding part comprises a feeding bin (4), the feeding bin (4) is coaxially arranged with the roughing section pipe body (2), a second annular channel (404) and a second conical channel (405) are coaxially opened in the feeding bin (4), the second annular channel (404) is connected with a feeding pipe (5), the feeding pipe (5) is tangent to the second annular channel (404), the second annular channel (404) is connected with a feeding pipe (5), the feeding pipe (5) is tangent to the second annular channel (404), the width of the second annular channel (404) is gradually widened from bottom to top, the second conical channel (405) is set to be conical and the bottom end is connected with the second annular channel (404), the second conical channel (405) is connected with the roughing section pipe body (2), and the second annular channel (404) is connected with the scavenging section pipe body (6).

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