Microbubble jet flotation machine

Abstract

The application discloses a micro-bubble jet flow flotation machine and belongs to the field of coal mine treatment, which comprises an outer cylinder, an inner cylinder is installed on the lower surface of the inner wall of the outer cylinder through a plurality of bosses and screws, a reflection cone is arranged on the inner wall of the inner cylinder, an outer overflow groove is welded on the surface of the outer cylinder, a steady flow grid is overlapped on the inner wall of the outer cylinder, the steady flow grid is located above the inner cylinder, the inner wall of the outer cylinder is fixedly connected with the surface of the same inner overflow cylinder through a plurality of fixing plates, and the lower surface of the inner wall of the inner cylinder is communicated with the top end of a circulating pipe. The micro-bubble jet flow flotation machine solves the problems that the arrangement of the mineralization pipe hinders the flow of bubbles and the mineralization bubbles are carried in the tailings after the large-scale micro-bubble jet flow flotation machine, the residence time of the mineralization bubbles in the foam layer is too long, and the clean coal recovery rate is reduced, and the clean coal recovery rate of the jet flow micro-bubble flotation machine is improved.

Description

Technical Field

[0001] This invention relates to the field of coal mine processing, and in particular to a microbubble jet flotation machine. Background Technology

[0002] Foam flotation is a common method for separating clean coal from fine coal slime. Jet microbubble flotation columns are a commonly used type of flotation equipment, with the German Imhoflot aerated flotation machine and the Australian JAMESON CELL being particularly representative. The German Imhoflot aerated flotation machine employs a combined multi-nozzle Venturi jet aeration principle. After aeration and mineralization, the slurry is fed into an aerated slurry distributor connected to the bottom of the lower guide tube. The distributor has several upward-facing nozzles, forming an upward gas-solid-liquid three-phase jet flow within the separation tank. During the upward movement of the mineralized bubbles and slurry flow within the separation tank, they separate. The upward-moving mineralized bubbles form a foam layer at the top of the separation tank. The foam concentrate overflows into a concentrate collection tank, while the slurry separated from the mineralized bubble flow moves downwards and is discharged from a tailings box connected to the bottom of the separation tank. The Australian company JAMESONCELL employs a parallel arrangement of multiple independent mineralizers. Each mineralizer consists of a slurry nozzle and a lower conduit. It uses a jet principle for aeration, causing the intake air to be sheared into microbubbles by fluid turbulence in the lower conduit. The aerated slurry is fed downwards into the separation tank through the lower conduit. The mineralized bubbles separate from the slurry at the outlet area of ​​the lower conduit. The mineralized bubbles move upwards, forming a mineralized froth layer at the top of the separation tank, while the slurry is discharged from the tailings pipe at the bottom of the separation tank. A common problem with both of these flotation devices is incomplete separation of mineralized bubbles and slurry in the separation zone. When the aeration rate is high and the amount of frother is large, the microbubbles can enter the tailings with the slurry, causing concentrate loss in the tailings and affecting the flotation effect.

[0003] Chinese patents for jet microbubble flotation machine (application number 201721126733.5), cavitation jet microbubble flotation machine and cavitation jet bubble generator (application number: 201911031732.6), and jet-type short column flotation machine (application number 202020121204.1) all employ an inner cylinder within the separation tank. Due to the action of the inner cylinder, most of the aerated slurry is deflected upwards. In the upward outlet area of ​​the inner cylinder, mineralized bubbles move upwards, while the slurry deflects downwards through the annular gap between the inner and outer cylinders and is discharged from the tailings box as tailings. This reduces the entrainment of bubbles in the descending slurry flow to a certain extent. The difference lies in the fact that the jet microbubble flotation machine (application number 201721126733.5) and the cavitation jet microbubble flotation machine and cavitation jet bubble generator (application number: 201911031732.6) are equipped with a conical reflective mechanism in the inner cylinder and a rectifier screen plate at the outlet of the inner cylinder, which further enhances the guidance and separation of mineralized bubbles and slurry. However, the technical solutions adopted in the above inventions do not completely separate mineralized bubbles from the slurry flow, and do not completely solve the problems existing in the two flotation machines mentioned above. Under normal operating conditions, especially under high aeration conditions, the flotation machine still produces the problem of bubbles being carried in the descending slurry flow, resulting in the loss of concentrate in the tailings.

[0004] On the other hand, the aforementioned jet microbubble flotation machines mostly adopt a concentrate foam collection method with peripheral foam overflow. After the equipment is enlarged, a dead zone for foam flow is often formed in the upper center of the flotation machine. In addition, the distribution of mineralization pipes in the cross-section of the flotation machine hinders the flow of foam, affects the mobility of concentrate foam to overflow to the periphery, causes poor foam discharge, and the residence time of mineralization bubbles in the foam layer is too long, which affects the improvement of clean coal recovery rate. Summary of the Invention

[0005] To overcome the aforementioned deficiencies of the prior art, the present invention provides a microbubble jet flotation machine, which solves the problems of the mineralization tube arrangement of the existing microbubble jet flotation machine causing obstruction of foam flow and the entrainment of mineralization bubbles in the tailings, and the excessive residence time of mineralization bubbles in the foam layer, resulting in a decrease in clean coal recovery rate. The present invention provides a jet microbubble flotation machine characterized by enhanced collection of mineralization bubble overflow and prevention of microbubbles being entrained into the slurry flow.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a microbubble jet flotation machine, comprising an outer cylinder, an inner cylinder being installed on the lower surface of the inner wall of the outer cylinder by a plurality of welded bosses and screws, a reflective cone being provided on the inner wall of the inner cylinder, an overflow groove being welded on the surface of the outer cylinder, and a flow stabilizing grid being attached to the inner wall of the outer cylinder, the flow stabilizing grid being located above the inner cylinder.

[0007] The inner wall of the outer cylinder is fixedly connected to the surface of the same inner overflow cylinder by several fixing plates. The lower surface of the inner wall of the inner cylinder is connected to the top of the circulating material pipe. The surface of the circulating material pipe is snapped onto the lower surface of the inner wall of the tailings section. The upper surface of the tailings section is connected to the lower surface of the inner wall of the outer cylinder. The left side of the inner wall of the tailings section is connected to the tailings regulating box through the tailings pipe.

[0008] An operating platform is mounted on the upper surface of the outer cylinder by screws. A three-material distributor is fixedly connected to the upper surface of the operating platform by screws. Several partitions are provided on the inner wall of the three-material distributor. The surface of the three-material distributor is connected to the top of several slurry distribution pipes. A bubble generator is snapped into the bottom of the slurry distribution pipes.

[0009] The surface of the three material distributors is connected to the surface of the bubble generator through several air supply pipes. The lower surface of the bubble generator is connected to the top of the lower conduit. The bottom end of the lower conduit is snapped into the lower surface of the flow stabilizing grid. The surfaces of several lower conduits are provided with the same annular foam guide cone.

[0010] As a preferred embodiment of the present invention, the reflective cone is fixedly connected to the lower surface of the inner wall of the inner cylinder by a plurality of steel pipes welded to the inner wall, and the lower surface of the inner wall of the outer overflow groove is inclined.

[0011] As a preferred embodiment of the present invention, a bracket is welded to the upper part of the inner wall of the inner cylinder, the flow stabilizing grid overlaps with the upper surface of the bracket, the inner wall of the inner overflow cylinder is connected to the inner wall of the outer overflow groove through a connecting pipe, and an opening is provided on the surface of the outer overflow groove.

[0012] As a preferred embodiment of the present invention, the surface of the slurry distribution pipe is provided with a slurry valve, and the air supply pipe is a flexible hose with a check valve on its surface.

[0013] As a preferred embodiment of the present invention, the top end of the slurry distribution pipe is located above the partition plate, the top end of the air supply pipe is located between the two corresponding partition plates, and the upper surface of the three-material distributor is provided with an inlet.

[0014] As a preferred embodiment of the present invention, an inclined plate assembly is welded to the surface of the inner cylinder, and the surface of the inclined plate assembly overlaps with the inner wall of the outer cylinder.

[0015] In a preferred embodiment of the present invention, the surface of the bubble generator is snapped onto the upper surface of the operating platform. The bubble generator includes a sealing shell, nozzles, an air inlet ring, and a cavitation pipe. The upper surface of the sealing shell is connected to the bottom end of the slurry distribution pipe, the lower surface of the sealing shell is connected to the top end of the lower conduit, the lower part of the inner wall of the sealing shell is snapped onto the surface of the cavitation pipe, the upper surface of the cavitation pipe overlaps with the lower surface of the air inlet ring, the upper surface of the air inlet ring is provided with a plurality of nozzles, and the inner wall of the sealing shell is snapped onto the bottom ends of two corresponding air supply pipes.

[0016] As a preferred embodiment of the present invention, the annular foam guide cone includes an upper sealing plate, an outer cone, an inner cone, sleeves, and a lower sealing plate. The lower surface of the upper sealing plate is welded to the upper surfaces of the outer and inner cones. The lower surfaces of the outer and inner cones are welded to the upper surface of the same lower sealing plate. The opposite surfaces of the lower sealing plate and the upper sealing plate are engaged with the two ends of several sleeves.

[0017] As a preferred embodiment of the present invention, the installation tilt angle of the inclined plate assembly is 70 degrees and the longitudinal height is 500-1500mm.

[0018] As a preferred embodiment of the present invention, the surface of the three material distributor is provided with a main air inlet pipe, the main air inlet pipe and several air supply pipes are located at the same height, and a valve is provided on the surface of the main air inlet pipe.

[0019] Compared with the prior art, the beneficial effects that this invention can achieve are:

[0020] This microbubble jet flotation machine solves the problems of obstruction of foam flow and entrainment of mineralized bubbles in tailings caused by the arrangement of mineralization tubes after the scaling up of existing microbubble jet flotation machines, as well as the problem of reduced clean coal recovery rate caused by excessive residence time of mineralized bubbles in the foam layer. It improves the concentrate recovery rate of jet microbubble flotation machine. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0022] Figure 2 This is a frontal cross-sectional view of the present invention.

[0023] Figure 3 This is a three-dimensional structural diagram of the operating platform of the present invention;

[0024] Figure 4 This is a three-dimensional cross-sectional structural diagram of the inner cylinder of the present invention;

[0025] Figure 5 This is a three-dimensional cross-sectional structural diagram of the outer cylinder of the present invention;

[0026] Figure 6This is a three-dimensional cross-sectional structural diagram of the bubble generator of the present invention;

[0027] Figure 7 This is a front view of the inclined plate assembly of the present invention.

[0028] Figure 8 This is a frontal cross-sectional view of the annular foam guide cone of the present invention;

[0029] Figure 9 This is a top view of the annular foam guide cone of the present invention;

[0030] The components include: 1. Outer cylinder, 2. Outer overflow trough, 3. Inner cylinder, 4. Reflective cone, 5. Flow stabilizing grid, 6. Inner overflow cylinder, 7. Circulating material pipe, 8. Tailings short section, 9. Tailings pipe, 10. Tailings regulating box, 11. Operating platform, 12. Three material distributors, 13. Bubble generator, 131. Sealing shell, 132. Nozzle, 133. Air inlet ring, 134. Cavitation pipe, 14. Slurry distribution pipe, 15. Slurry valve, 16. Air supply pipe, 17. Check valve, 18. Main air inlet pipe, 19. Lower guide pipe, 20. Annular foam guide cone, 201. Upper sealing plate, 202. Outer cone, 203. Inner cone, 204. Sleeve, 205. Lower sealing plate, 21. Inclined plate assembly, 22. Connecting pipe, 23. Clip, 24. Fixing plate, 25. Feed inlet. Detailed Implementation

[0031] To make the technical means, creative features, and achieved objectives and effects of this invention readily understandable, the invention is further described below with reference to specific embodiments. However, the following embodiments are merely preferred embodiments of this invention and not all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this invention. Unless otherwise specified, the experimental methods in the following embodiments are conventional methods, and the materials and reagents used in the following embodiments are commercially available unless otherwise specified.

[0032] Example

[0033] like Figure 1-9 As shown, the present invention provides a microbubble jet flotation machine, including an outer cylinder 1. An inner cylinder 3 is installed on the lower surface of the inner wall of the outer cylinder 1 by a plurality of welded bosses and screws. A reflective cone 4 is provided on the inner wall of the inner cylinder 3. An overflow groove 2 is welded on the surface of the outer cylinder 1. A flow stabilizing grid 5 is attached to the inner wall of the outer cylinder 1 and is located above the inner cylinder 3.

[0034] The inner wall of the outer cylinder 1 is fixedly connected to the surface of the same inner overflow cylinder by several fixing plates 24. The lower surface of the inner wall of the inner cylinder 3 is connected to the top of the circulating material pipe 7. The surface of the circulating material pipe 7 is clamped to the lower surface of the inner wall of the tailings section 8. The upper surface of the tailings section 8 is connected to the lower surface of the inner wall of the outer cylinder 1. The left side of the inner wall of the tailings section 8 is connected to the tailings regulating box 10 through the tailings pipe 9.

[0035] An operating platform 11 is installed on the upper surface of the outer cylinder 1 by screws. A three-material distributor 12 is fixedly connected to the upper surface of the operating platform 11 by screws. Several partitions are provided on the inner wall of the three-material distributor 12. The surface of the three-material distributor 12 is connected to the top of several slurry distribution pipes 14. A bubble generator 13 is snapped into the bottom of the slurry distribution pipes 14.

[0036] The surface of the three material distributor 12 is connected to the surface of the bubble generator 13 through several air supply pipes 16. The lower surface of the bubble generator 13 is connected to the top of the lower conduit 19. The bottom end of the lower conduit 19 is snapped into the lower surface of the flow stabilizing grid 5. The surfaces of several lower conduits 19 are provided with the same annular foam guide cone 20.

[0037] In other embodiments, such as Figure 1 and Figure 2 As shown, a slurry valve 15 is provided on the surface of the slurry distribution pipe 14, and a check valve 17 is provided on the surface of the air supply pipe 16. The top end of the slurry distribution pipe 14 is located above the partition plate, and the top end of the air supply pipe 16 is located between the corresponding two partition plates. An inlet 25 is provided on the upper surface of the three-material distributor 12.

[0038] By setting the slurry valve 15, the slurry flow rate and flow rate can be controlled, so that it can play a good regulating and control effect during use. By setting the check valve 17, the check valve 17 can effectively prevent the slurry from flowing back into the air supply pipe 16 when the bubble generator 13 is blocked or stops working. By setting the baffle, the baffle can play a role in separating different media inside.

[0039] In other embodiments, such as Figure 3 and Figure 4 As shown, a bracket 23 is welded to the upper part of the inner wall of the inner cylinder 3. The flow stabilizing grid 5 overlaps with the upper surface of the bracket 23. The inner wall of the inner overflow cylinder is connected to the inner wall of the outer overflow trough 2 through the connecting pipe 22. An opening is provided on the surface of the outer overflow trough 2. The installation angle of the inclined plate assembly 21 is 70 degrees and the longitudinal height is 500-1500mm. A main air inlet pipe 18 is provided on the surface of the three material distributor 12. The main air inlet pipe 18 and several air supply pipes 16 are located at the same height. A valve is provided on the surface of the main air inlet pipe 18.

[0040] By setting up the card holder 23, the card holder 23 can maintain the stable placement of the flow stabilizing grid 5, making it more convenient to use. By setting up the connecting pipe 22, the connecting pipe 22 can maintain a good communication effect between the inner overflow tank and the outer overflow tank 2, which is convenient for unified discharge treatment. By setting up the opening, the opening can discharge the raw materials inside the inner overflow tank and the outer overflow tank 2. By setting up the inclined plate assembly 21, the inclined plate assembly 21 has the effect of separating according to the slurry density, so that the mineralized bubbles with low density and the slurry with high density can be separated more effectively.

[0041] In other embodiments, such as Figure 5 and Figure 6 As shown, the surface of the bubble generator 13 is snapped onto the upper surface of the operating platform 11. The bubble generator 13 includes a sealing shell 131, a nozzle 132, an air inlet ring 133, and a cavitation pipe 134. The upper surface of the sealing shell 131 is connected to the bottom end of the slurry distribution pipe 14, and the lower surface of the sealing shell 131 is connected to the top end of the lower conduit 19. The lower part of the inner wall of the sealing shell 131 is snapped onto the surface of the cavitation pipe 134. The upper surface of the cavitation pipe 134 overlaps with the lower surface of the air inlet ring 133. Several nozzles 132 are provided on the upper surface of the air inlet ring 133. The inner wall of the sealing shell 131 is snapped onto the bottom end of two corresponding air supply pipes 16.

[0042] By setting up cavitation pipe 134, cavitation pipe 134 and nozzle 132 can maintain a stable flow rate and maintain a negative pressure state during use, thus ensuring the gas extraction effect. By setting up air supply pipe 16, air supply pipe 16 can maintain the supply of gas to the inside of bubble generator 13. By setting up air inlet ring 133, air inlet ring 133 can maintain more uniform gas mixing during use, which is conducive to the dispersion effect after the gas enters.

[0043] In other embodiments, such as Figure 7 and Figure 9 As shown, the reflective cone 4 is fixedly connected to the lower surface of the inner wall of the inner cylinder 3 by several steel pipes welded to the inner wall. The lower surface of the inner wall of the outer overflow trough 2 is inclined. An inclined plate assembly 21 is welded to the surface of the inner cylinder 3. The surface of the inclined plate assembly 21 overlaps with the inner wall of the outer cylinder 1. The annular foam guide cone 20 includes an upper sealing plate 201, an outer cone 202, an inner cone 203, a sleeve 204, and a lower sealing plate 205. The lower surface of the upper sealing plate 201 is welded to the upper surfaces of the outer cone 202 and the inner cone 203. The lower surfaces of the outer cone 202 and the inner cone 203 are welded to the upper surface of the same lower sealing plate 205. The opposite surfaces of the lower sealing plate 205 and the upper sealing plate 201 are snapped into the two ends of several sleeves 204.

[0044] By setting an annular foam guide cone 20, mineralized bubbles can be gathered into the inner overflow cylinder 6 and the outer overflow trough 2, making the overall control more stable. By setting a sleeve 204, the sleeve 204 can maintain a good fit and fixation with the surface of the lower guide tube 19, so that the overall height is maintained. With the cooperation of the inclined surfaces of the outer cone 202 and the inner cone 203, when the bubbles below move upward, they act with each other to form a driving force in one direction, thereby completing the effect of gathering and guiding the flow.

[0045] Working principle:

[0046] S1. During operation, fresh coal slurry is pressurized by a pump and fed into a three-material distributor 12. The three-material distributor 12 has several distribution ports on its upper and lower layers. The slurry and air are distributed equally to several bubble generators 13 through several slurry distribution pipes 14 and several air supply pipes 16. When the pressurized slurry passes through the bubble generator 13, it forms a negative pressure due to the jet under the action of the nozzle 132 and the cavitation pipe 134, which causes it to draw in air through several air supply pipes 16 under the action of the negative pressure.

[0047] S2. The total gas supply is regulated by the main air inlet pipe and its valves, so that the negative pressure between the two corresponding baffles is regulated and the amount of gas drawn in is regulated. After the aerated slurry passes through the bubble generator 13, it is fully mineralized by the mineralized bubbles and hydrophobic coal particles in the lower conduit 19 to form a mineralized bubble aggregate.

[0048] S3. Due to the action of the annular foam guide cone 20, the mineralized bubbles in the space between the upper edge of the outer cylinder 1 and the outer edge of the inner overflow cylinder 6 are driven towards the inner overflow cylinder 6 and the outer overflow trough 2 as concentrate and discharged into the next operation stage.

[0049] S4. Unmineralized particles flow downwards into the tailings section 8 through the annular gap between the inner cylinder 3 and the outer cylinder 1, and are discharged as tailings through the tailings pipe 9 and the tailings regulating box 10 to enter the next operation stage. Since the annular gap between the inner cylinder 3 and the outer cylinder 1 is provided with an inclined plate assembly 21, and since the inclined plate assembly 21 has the effect of separating according to the slurry density, the mineralized bubbles with low density and the slurry with high density are separated more effectively.

[0050] S5. In the inclined plate assembly 21, the mineralized bubbles return to the upper surface of the inclined channel and move upward to re-enter the foam layer, while the slurry moves downward along the lower surface of the inclined channel, thus preventing the mineralized bubbles from entering the tailings with the descending slurry flow.

[0051] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0052] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A microbubble jet flotation machine, comprising an outer cylinder (1), characterized in that: The inner wall of the outer cylinder (1) is fitted with an inner cylinder (3) by a plurality of welded bosses and screws. The inner wall of the inner cylinder (3) is provided with a reflective cone (4). The surface of the outer cylinder (1) is welded with an outer overflow groove (2). The inner wall of the outer cylinder (1) is overlapped with a flow stabilizing grid (5). The flow stabilizing grid (5) is located above the inner cylinder (3). The inner wall of the outer cylinder (1) is fixedly connected to the surface of the same inner overflow cylinder by several fixing plates (24). The lower surface of the inner wall of the inner cylinder (3) is connected to the top of the circulating material pipe (7). The surface of the circulating material pipe (7) is snapped onto the lower surface of the inner wall of the tailings section (8). The upper surface of the tailings section (8) is connected to the lower surface of the inner wall of the outer cylinder (1). The left side of the inner wall of the tailings section (8) is connected to the tailings regulating box (10) through the tailings pipe (9). An operating platform (11) is installed on the upper surface of the outer cylinder (1) by screws. A three-material distributor (12) is fixedly connected to the upper surface of the operating platform (11) by screws. Several partitions are provided on the inner wall of the three-material distributor (12). The surface of the three-material distributor (12) is connected to the top of several slurry distribution pipes (14). A bubble generator (13) is snapped into the bottom end of the slurry distribution pipes (14). The surface of the three material distributor (12) is connected to the surface of the bubble generator (13) through several air supply pipes (16). The lower surface of the bubble generator (13) is connected to the top of the lower conduit (19). The bottom end of the lower conduit (19) is snapped onto the lower surface of the flow stabilizing grid (5). The surfaces of several lower conduits (19) are provided with the same annular foam guide cone (20). The surface of the bubble generator (13) is snapped onto the upper surface of the operating platform (11). The bubble generator (13) includes a sealing shell (131), a nozzle (132), an air inlet ring (133), and a cavitation pipe (134). The upper surface of the sealing shell (131) is connected to the bottom end of the slurry distribution pipe (14). The lower surface of the sealing shell (131) is connected to the top end of the lower conduit (19). The lower part of the inner wall of the sealing shell (131) is snapped onto the surface of the cavitation pipe (134). The upper surface of the cavitation pipe (134) overlaps with the lower surface of the air inlet ring (133). The upper surface of the air inlet ring (133) is provided with a plurality of nozzles (132). The inner wall of the sealing shell (131) is snapped onto the bottom end of two corresponding air supply pipes (16). The annular foam guide cone (20) includes an upper sealing plate (201), an outer cone (202), an inner cone (203), a sleeve (204), and a lower sealing plate (205). The lower surface of the upper sealing plate (201) is welded to the upper surfaces of the outer cone (202) and the inner cone (203). The lower surfaces of the outer cone (202) and the inner cone (203) are welded to the upper surface of the same lower sealing plate (205). The opposite surfaces of the lower sealing plate (205) and the upper sealing plate (201) are engaged with the two ends of several sleeves (204).

2. The microbubble jet flotation machine according to claim 1, characterized in that: The reflective cone (4) is fixedly connected to the lower surface of the inner wall of the inner cylinder (3) by several steel pipes welded to the inner wall, and the lower surface of the inner wall of the outer overflow groove (2) is set in an inclined shape.

3. A microbubble jet flotation machine according to claim 1, characterized in that: A bracket (23) is welded to the upper part of the inner wall of the inner cylinder (3). The flow stabilizing grid (5) overlaps with the upper surface of the bracket (23). The inner wall of the inner overflow cylinder is connected to the inner wall of the outer overflow groove (2) through a connecting pipe (22). An opening is provided on the surface of the outer overflow groove (2).

4. A microbubble jet flotation machine according to claim 1, characterized in that: The surface of the slurry distribution pipe (14) is provided with a slurry valve (15), and the air supply pipe (16) is a flexible hose and is provided with a check valve (17) on its surface.

5. A microbubble jet flotation machine according to claim 1, characterized in that: The top end of the slurry distribution pipe (14) is located above the partition, the top end of the air supply pipe (16) is located between the two corresponding partitions, and the upper surface of the three material distributor (12) is provided with an inlet (25).

6. A microbubble jet flotation machine according to claim 1, characterized in that: The inner cylinder (3) is welded with an inclined plate assembly (21), and the surface of the inclined plate assembly (21) overlaps with the inner wall of the outer cylinder (1).

7. A microbubble jet flotation machine according to claim 6, characterized in that: The tilting plate assembly (21) has an installation tilt angle of 70 degrees and a longitudinal height of 500-1500 mm.

8. A microbubble jet flotation machine according to claim 1, characterized in that: The surface of the three material distributor (12) is provided with a main air inlet pipe (18), which is located at the same height as several air supply pipes (16), and a valve is provided on the surface of the main air inlet pipe (18).

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