A fine particle size mineral dissolved air flotation device

Abstract

This invention provides a dissolved air flotation device for fine-grained minerals, comprising a flotation device body, a power unit, an impeller assembly, a distribution device, and a release device. The flotation device body includes a tank and a foam tank shell, with the upper opening of the tank located within the foam tank shell. The power unit includes a hollow shaft and a drive mechanism driven to the upper end of the hollow shaft, which is connected to a first high-pressure air channel. The impeller assembly includes an impeller and a bubble generator mounted on the impeller. The distribution device includes a connecting pipe, an impeller cavity located at the bottom of the connecting pipe, and multiple distribution pipes arranged in a ring around the outer periphery of the impeller cavity, with the impeller assembly located within the impeller cavity. The release device includes a release chamber connected to the distribution pipes and a reflector plate cooperating with the release chamber, forming a release gap between the release chamber and the reflector plate. This invention enables fine-grained minerals to undergo collision mineralization and precipitation mineralization in a highly turbulent environment, achieving efficient recovery of fine-grained minerals.

Description

Technical Field

[0001] This invention relates to the field of flotation equipment technology, and in particular to a dissolved air flotation device for fine-particle minerals. Background Technology

[0002] 90% of the world's non-ferrous metals, 50% of ferrous metals, and key non-metallic minerals (quartz, fluorite, phosphorus, lepidolite, etc.) are separated and enriched using flotation. Flotation equipment is the most important support for realizing the flotation process. From the perspective of the characteristics of the resources themselves, as the amount of mined resources increases, the proportion of poor-endowed, fine-grained, and impure resources increases, and the number of fine-grained and micro-fine-grained minerals increases. The liberation degree of conventional mineral monomers is generally -74 micrometers, while the liberation degree of fine-grained and micro-fine-grained minerals reaches -37 micrometers, or even below -10 micrometers. Therefore, the efficient separation of fine-grained minerals requires creating a more intense turbulent dynamic separation environment. However, traditional flotation equipment cannot provide a high-turbulence environment for fine-grained minerals. To achieve better technical indicators, using traditional flotation equipment for the flotation of fine-grained minerals requires a large amount of energy consumption, resulting in poor economic performance. In other words, traditional flotation equipment can no longer achieve efficient separation and enrichment of fine-grained minerals.

[0003] Therefore, designing a flotation device suitable for the dynamic environment of fine or microparticles, thereby improving economic and technical indicators while saving energy consumption and achieving efficient recovery of microparticles, is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to provide a dissolved air flotation device for fine-grained minerals, which enables fine-grained minerals to undergo collision mineralization and precipitation mineralization in a highly turbulent environment, thereby achieving efficient recovery of fine-grained minerals.

[0005] This invention provides a dissolved air flotation device for fine-particle minerals, comprising: The flotation device body includes a tank and a foam tank shell, wherein the upper opening of the tank is disposed inside the foam tank shell; The power unit includes a hollow shaft and a drive mechanism drivenly connected to the upper end of the hollow shaft. The lower end of the hollow shaft extends into the lower part of the groove. The drive mechanism is provided with a first high-pressure air channel, and the hollow shaft is connected to the first high-pressure air channel. An impeller assembly is installed at the lower end of the hollow shaft, the impeller assembly including an impeller and a bubble generator installed on the impeller; A distribution device includes a connecting pipe, an impeller cavity disposed at the bottom of the connecting pipe, and a plurality of distribution pipes arranged in a ring around the outer periphery of the impeller cavity. Each of the distribution pipes is connected to the impeller cavity. The lower end of the hollow shaft passes through the connecting pipe and extends into the impeller cavity, and the impeller device is disposed inside the impeller cavity. A release device is provided in a one-to-one correspondence with the distribution pipe. The release device includes a release chamber connected to the distribution pipe and a reflective disk that cooperates with the release chamber. A release gap is formed between the release chamber and the reflective disk.

[0006] According to the present invention, a fine-particle-scale dissolved air flotation device for minerals is provided, wherein an installation plate is fixedly provided at the bottom of the impeller cavity, a guide hole is provided on the installation plate, a guide pipe is connected to the guide hole, and an installation flange corresponding to the installation plate is provided at the upper end of the guide pipe, the installation flange is connected and fixed to the installation plate; wherein the guide pipe is a tapered tube that is smaller at the top and larger at the bottom.

[0007] According to the present invention, a dissolved air flotation device for fine-grained minerals is provided, wherein a feed inlet and a tailings outlet are respectively provided at the bottom of the side wall of the tank, and the feed inlet and the tailings outlet are respectively located on opposite sides of the tank.

[0008] According to the present invention, a dissolved air flotation device for fine-particle minerals is provided, wherein a foam outlet is provided at the bottom of the foam tank shell, and the foam outlet is connected to the upper opening of the tank.

[0009] According to the present invention, a micro-particle-scale dissolved air flotation device for minerals is provided, wherein a foam expansion plate is provided at the upper end of the tank, and the foam expansion plate has a conical structure that is larger at the top and smaller at the bottom.

[0010] According to the present invention, a micro-particle-scale dissolved air flotation device for minerals includes an impeller comprising an impeller end plate, a guide cone disposed at the center of the lower surface of the impeller end plate, and a plurality of blades disposed on the lower surface of the impeller end plate, the plurality of blades being disposed around the periphery of the guide cone; a distributor disposed at the center of the upper end of the impeller end plate, the distributor being fixedly connected to the hollow shaft; and a plurality of radially arranged second high-pressure air channels disposed on the upper surface of the impeller end plate, the inner end of each second high-pressure air channel being connected to the distributor, and the outer end of each second high-pressure air channel being provided with the bubble generator.

[0011] According to the present invention, a fine-particle-scale dissolved air flotation device for minerals includes a bubble generator comprising a cylindrical section, a converging section, a jet section, and an aerator chamfer connected in sequence. The diameter of the jet section is no greater than 3 / 1 of the diameter of the cylindrical section. The cone angle of the converging section is 20-45 degrees. The aerator chamfer is located at the end of the jet section, and the chamfer angle is 30 degrees. The bubble generator is connected to the outer end of the second high-pressure air channel via a lock nut.

[0012] According to the present invention, a fine-particle-scale dissolved air flotation device for minerals is provided, wherein a mounting hole for the hollow shaft to pass through is provided on the top plate of the foam tank shell, and a mounting seat is provided on the lower surface of the top plate at the position corresponding to the mounting hole, and the upper end of the connecting pipe is connected and fixed to the mounting seat through a connecting flange.

[0013] According to the present invention, a dissolved air flotation device for fine-grained minerals is provided, wherein each of the distribution pipes includes a horizontal pipe section and a downwardly curved pipe section, one end of the horizontal pipe section is connected to the impeller cavity, and the release chamber is connected to the curved pipe section.

[0014] According to the present invention, a dissolved air flotation device for fine-grained minerals is provided, wherein the reflector is an upwardly concave arc-shaped disk, the reflector is installed at the upper end of a support column, the lower end of the support column is connected to the tank body; the end of the release chamber is provided with an arc-shaped plate that matches the curvature of the reflector, the arc-shaped plate is located inside the reflector, and the gap between the arc-shaped plate and the reflector is 5~10mm.

[0015] The fine-particle-scale dissolved air flotation device provided by the present invention comprises a flotation device body, a power unit, an impeller unit, a distribution unit, and a release unit. The flotation device body includes a tank and a foam tank shell. The power unit includes a hollow shaft and a drive mechanism driven to the upper end of the hollow shaft. The impeller unit includes an impeller and a bubble generator mounted on the impeller. The distribution unit includes a connecting pipe, an impeller cavity located at the bottom of the connecting pipe, and multiple distribution pipes arranged in a ring around the outer periphery of the impeller cavity. The release unit is arranged in a one-to-one correspondence with the distribution pipes. The release unit includes a release chamber connected to the distribution pipe and a reflector plate cooperating with the release chamber. A release gap is formed between the release chamber and the reflector plate. During operation, the slurry is fed into the flotation unit through the feed port and drawn into the impeller cavity by the impeller rotary pump. At the same time, high-pressure air is injected from the upper part of the hollow shaft and ejected from the bubble generator of the impeller to form bubbles. This allows the slurry and bubbles to initially mix in the impeller cavity to form a pressurized gaseous slurry. Then, it is guided from the distribution pipe to the release area formed by the release chamber and the reflector. The pressurized gaseous slurry is released at low pressure through the narrow release gap between the release chamber and the reflector. During the release process, small bubbles precipitate directly on the surface of hydrophobic fine mineral particles, thus forming mineralized bubbles. Subsequently, the mineralized bubbles float to the surface of the tank under the action of buoyancy to form a foam layer. The foam enters the foam tank shell to achieve the purpose of recovery. Therefore, the dissolved air flotation device for fine-grained minerals provided by the present invention increases the solubility of air under high-pressure slurry and releases it in an atmospheric pressure tank. Utilizing the first principle of bubble precipitation, it enhances the separation environment for direct precipitation of bubbles from hydrophobic fine-grained minerals, enabling fine-grained minerals to undergo collision mineralization and precipitation mineralization in a highly turbulent environment, thereby achieving efficient recovery of fine-grained minerals. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the fine-particle-scale mineral dissolved air flotation device of the present invention; Figure 2 This is a front view of the distribution device in the fine-particle-size mineral dissolved air flotation device of the present invention; Figure 3 This is a top view of the distribution device in the fine-particle-size dissolved air flotation device of the present invention; Figure 4 This is a schematic diagram of the impeller device in the fine-particle-scale dissolved air flotation device of the present invention; Figure 5 for Figure 4 Sectional view along axis AA; Figure 6 This is a schematic diagram illustrating the working principle of the impeller device in the fine-particle-size dissolved air flotation apparatus of the present invention. Figure 7 This is a schematic diagram of the blade installation in the fine-particle-size dissolved air flotation device of the present invention; Figure 8 This is a schematic diagram of the bubble generator in the fine-particle-size mineral dissolved air flotation device of the present invention; Figure 9 This is a schematic diagram of the release device in the fine-particle-scale dissolved air flotation device of the present invention.

[0018] Explanation of reference numerals in the attached figures: 1. Tank body; 101. Feed inlet; 102. Tailings outlet; 2. Foam tank shell; 201. Foam outlet; 3. Hollow shaft; 4. Drive mechanism; 5. First high-pressure air channel; 6. High-pressure air delivery pipeline; 7. Bubble generator; 701. Cylindrical section; 702. Gradient section; 703. Jet section; 704. Amplifying chamfer; 8. Connecting pipe; 9. Impeller cavity; 10. Distribution pipe; 11. Release chamber; 12. Reflector; 13. Release gap; 14. Mounting plate; 15. Guide pipe; 16. Mounting flange; 17. Foam expansion plate; 18. Impeller end plate; 19. Guide cone; 20. Blade; 21. Distributor; 22. Second high-pressure air channel; 23. Lock nut; 24. Mounting base; 25. Connecting flange; 26. Support column; 27. Arc plate. Detailed Implementation

[0019] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this 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. Therefore, they should not be construed as limiting this invention.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] like Figures 1 to 9 As shown, the micro-particle-scale dissolved air flotation device of this invention includes a flotation device body, a power unit, an impeller unit, a distribution unit, and a release unit.

[0023] The flotation device body includes a tank 1 and a foam tank shell 2, with the upper opening of the tank 1 located inside the foam tank shell 2.

[0024] The power unit includes a hollow shaft 3 and a drive mechanism 4 that is driven to the upper end of the hollow shaft 3. The lower end of the hollow shaft 3 extends into the lower part of the tank 1. The drive mechanism 4 is provided with a first high-pressure air channel 5, and the hollow shaft 3 is connected to the first high-pressure air channel 5.

[0025] The impeller assembly is installed at the lower end of the hollow shaft 3, and includes an impeller and a bubble generator 7 mounted on the impeller. That is, the hollow shaft 3 can be driven to rotate by the drive mechanism 4, which in turn drives the impeller to rotate.

[0026] The distribution device includes a connecting pipe 8, an impeller cavity 9 located at the bottom of the connecting pipe 8, and multiple distribution pipes 10 arranged in a ring around the outer periphery of the impeller cavity 9. Each distribution pipe 10 is connected to the impeller cavity 9. The lower end of the hollow shaft 3 passes through the connecting pipe 8 and extends into the impeller cavity 9, and the impeller device is located inside the impeller cavity 9.

[0027] The release device is provided in a one-to-one correspondence with the distribution pipe 10. The release device includes a release chamber 11 connected to the distribution pipe 10 and a reflector 12 that cooperates with the release chamber 11. A release gap 13 is formed between the release chamber 11 and the reflector 12.

[0028] During operation, the slurry is fed into the flotation unit body through the feed port 101 and is drawn into the impeller chamber 9 by the impeller rotary pump. At the same time, high-pressure air is injected from the upper part of the hollow shaft 3 and ejected from the bubble generator 7 of the impeller to form bubbles. This allows the slurry and bubbles to be initially mixed in the impeller chamber 9 to form a pressurized gaseous slurry. Then, it is guided from the distribution pipe 10 to the release area formed by the release chamber 11 and the reflector 12. The pressurized gaseous slurry is released at low pressure from the narrow release gap 13 between the release chamber 11 and the reflector 12. During the release process, small bubbles are directly precipitated on the surface of hydrophobic fine mineral particles, thereby forming mineralized bubbles. Subsequently, the mineralized bubbles float in the tank body 1 under the action of buoyancy to form a foam layer. The foam enters the foam tank shell 2 to achieve the purpose of recovery.

[0029] Therefore, the dissolved air flotation device for fine-grained minerals in this embodiment of the invention increases the solubility of air under high-pressure slurry and releases it in the tank 1 at atmospheric pressure. Utilizing the first principle of bubble precipitation, it enhances the separation environment for direct precipitation of bubbles from hydrophobic fine-grained minerals, enabling fine-grained minerals to undergo collision mineralization and precipitation mineralization in a highly turbulent environment, thereby achieving efficient recovery of fine-grained minerals.

[0030] Specifically, the first high-pressure air channel 5 is connected to the high-pressure air delivery pipe 6 and is used to input high-pressure air into the hollow shaft 3.

[0031] In some embodiments of the present invention, a mounting plate 14 is fixedly provided at the bottom of the impeller cavity 9. A guide hole is provided on the mounting plate 14, and a guide pipe 15 is connected to the guide hole. A mounting flange 16 corresponding to the mounting plate 14 is provided at the upper end of the guide pipe 15, and the mounting flange 16 is connected and fixed to the mounting plate 14. The guide pipe 15 is a tapered pipe, smaller at the top and larger at the bottom. That is, the guide pipe 15 and the area below the impeller form a semi-enclosed region, enhancing the impeller's suction capacity and simultaneously guiding the slurry drawn up from below the impeller. After guidance, the slurry concentrates and enters the lower central region of the impeller cavity 9.

[0032] In some embodiments of the present invention, a feed inlet 101 and a tailings outlet 102 are respectively provided at the bottom of the side wall of the tank 1, and the feed inlet 101 and the tailings outlet 102 are located on opposite sides of the tank 1. The slurry enters the tank 1 through the feed inlet 101. The tailings outlet 102 is used to discharge unrecovered target minerals and non-target minerals along with the slurry.

[0033] In some embodiments of the present invention, a foam outlet 201 is provided at the bottom of the foam tank shell 2, and the foam outlet 201 is connected to the upper opening of the tank body 1. That is, after the foam enters the foam tank shell 2, it is discharged through the foam outlet 201 for recycling.

[0034] In some embodiments of the present invention, a foam expansion plate 17 is provided at the upper end of the tank 1. The foam expansion plate 17 has a conical structure that is larger at the top and smaller at the bottom. By providing the foam expansion plate 17, a foam zone with a low cross-sectional area load is formed within the area enclosed by the foam expansion plate 17, thereby enhancing the movement and enrichment process of the foam.

[0035] In some embodiments of the present invention, the impeller includes an impeller end plate 18, a guide cone 19 is provided at the center of the lower surface of the impeller end plate 18, and a plurality of blades 20 are provided on the lower surface of the impeller end plate 18, with the blades 20 respectively disposed around the periphery of the guide cone 19. The blades 20 are backward-curved. By providing the guide cone 19, the pumped slurry can be guided and distributed to the spaces between the blades 20, reducing resistance loss.

[0036] A distributor 21 is provided at the center of the upper end of the impeller end plate 18, and the distributor 21 is fixedly connected to the hollow shaft 3. Multiple radially arranged second high-pressure air channels 22 are provided on the upper surface of the impeller end plate 18. The inner end of each second high-pressure air channel 22 is connected to the distributor 21, and a bubble generator 7 is provided at the outer end of each second high-pressure air channel 22.

[0037] During operation, the slurry is drawn in from the lower center of the impeller and accelerated by the impeller blades 20, generating a high pressure head. High-pressure air is forced from the distributor 21 through the second high-pressure air channel 22 into the bubble generator 7, and is ejected outward under the action of the bubble generator 7, thereby forming bubbles at the edge of the impeller end plate 18. The slurry drawn in by the impeller is ejected outward circumferentially, constrained by the inner wall of the impeller cavity 9, forming a certain pressure environment. Under a certain pressure, the slurry and air mixture enters the distribution pipes 10 distributed around the impeller cavity 9.

[0038] In some embodiments of the present invention, the bubble generator 7 includes a cylindrical section 701, a tapering section 702, a jet section 703, and an expansion chamfer 704 connected in sequence. The diameter of the jet section 703 is no more than 3 / 1 the diameter of the cylindrical section 701. The cone angle of the tapering section 702 is 20-45 degrees. The expansion chamfer 704 is located at the end of the jet section 703, and the chamfer angle of the expansion chamfer 704 is 30 degrees. The bubble generator 7 is connected to the outer end of the second high-pressure air channel 22 via a lock nut 23. High-pressure air flows steadily through the cylindrical section 701 of the bubble generator 7 and then enters the tapering section 702 for acceleration. After acceleration, it enters the jet section 703 for further acceleration, initially reaching subsonic speed. Based on the shock wave effect, an expansion chamfer 704 is designed at the end of the jet section 703 to accelerate the subsonic airflow to supersonic speed, thereby creating conditions for the formation of small bubbles.

[0039] In some embodiments of the present invention, a mounting hole for the hollow shaft 3 to pass through is provided on the top plate of the foam tank shell 2, and a mounting seat 24 is provided on the lower surface of the top plate at the position corresponding to the mounting hole. The upper end of the connecting pipe 8 is connected and fixed to the mounting seat 24 through a connecting flange 25.

[0040] In some embodiments of the present invention, each distribution pipe 10 includes a horizontal pipe section and a downwardly curved pipe section, one end of the horizontal pipe section is connected to the impeller cavity 9, and the release chamber 11 is connected to the curved pipe section.

[0041] The reflector 12 is an upwardly concave arc-shaped disc, mounted on the upper end of the support column 26, the lower end of which is connected to the bottom plate of the tank 1. The release chamber 11 has an arc-shaped plate 27 at its end, matching the curvature of the reflector 12. The arc-shaped plate 27 is located within the reflector 12, and the width b of the release gap 13 formed between the arc-shaped plate 27 and the reflector 12 is 5-10 mm.

[0042] During operation, high-pressure air and slurry enter the release chamber 11 through the distribution pipe 10 and flow out through the narrow release gap 13 between the arc plate 27 and the reflector 12. They are then released under normal pressure in the tank 1 to accelerate the precipitation of small bubbles on the surface of hydrophobic mineral particles, thus forming a mineralization effect.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dissolved air flotation device for fine-grained minerals, characterized in that, include: The flotation device body includes a tank and a foam tank shell, wherein the upper opening of the tank is disposed inside the foam tank shell; The power unit includes a hollow shaft and a drive mechanism drivenly connected to the upper end of the hollow shaft. The lower end of the hollow shaft extends into the lower part of the groove. The drive mechanism is provided with a first high-pressure air channel, and the hollow shaft is connected to the first high-pressure air channel. An impeller assembly is installed at the lower end of the hollow shaft, the impeller assembly including an impeller and a bubble generator installed on the impeller; A distribution device includes a connecting pipe, an impeller cavity disposed at the bottom of the connecting pipe, and a plurality of distribution pipes arranged in a ring around the outer periphery of the impeller cavity. Each of the distribution pipes is connected to the impeller cavity. The lower end of the hollow shaft passes through the connecting pipe and extends into the impeller cavity, and the impeller device is disposed inside the impeller cavity. A release device is provided in a one-to-one correspondence with the distribution pipe. The release device includes a release chamber connected to the distribution pipe and a reflective disk that cooperates with the release chamber. A release gap is formed between the release chamber and the reflective disk. The impeller includes an impeller end plate, a guide cone at the center of the lower surface of the impeller end plate, and multiple blades on the lower surface of the impeller end plate, the multiple blades being respectively arranged around the guide cone; a distributor is provided at the center of the upper end of the impeller end plate, the distributor being fixedly connected to the hollow shaft; multiple radially arranged second high-pressure air channels are provided on the upper surface of the impeller end plate, the inner end of each second high-pressure air channel being connected to the distributor, and the outer end of each second high-pressure air channel being provided with the bubble generator; Each of the aforementioned distribution pipes includes a horizontal pipe section and a downwardly curved pipe section, one end of the horizontal pipe section being connected to the impeller cavity, and the release chamber being connected to the curved pipe section; The reflector is an upwardly concave arc-shaped disc, which is mounted on the upper end of the support column, and the lower end of the support column is connected to the groove. The end of the release chamber is provided with an arc-shaped plate that matches the curvature of the reflector. The arc-shaped plate is located inside the reflector, and the gap between the arc-shaped plate and the reflector is 5~10mm.

2. The dissolved air flotation device for fine-grained minerals according to claim 1, characterized in that, A mounting plate is fixedly provided at the bottom of the impeller cavity. A flow guide hole is provided on the mounting plate. A flow guide pipe is connected to the flow guide hole. A mounting flange corresponding to the mounting plate is provided at the upper end of the flow guide pipe. The mounting flange is connected and fixed to the mounting plate. The flow guide pipe is a tapered pipe with a smaller top and a larger bottom.

3. The dissolved air flotation device for fine-grained minerals according to claim 1, characterized in that, A feed inlet and a tailings outlet are respectively provided at the bottom of the side wall of the tank, and the feed inlet and the tailings outlet are respectively located on opposite sides of the tank.

4. The dissolved air flotation device for fine-grained minerals according to claim 1, characterized in that, A foam outlet is provided at the bottom of the foam tank shell, and the foam outlet is connected to the upper opening of the tank.

5. The dissolved air flotation device for fine-grained minerals according to claim 1, characterized in that, A foam excavator is provided at the upper end of the tank. The foam excavator has a conical structure that is larger at the top and smaller at the bottom.

6. The dissolved air flotation device for fine-grained minerals according to claim 1, characterized in that, The bubble generator comprises a cylindrical section, a tapering section, a jet section, and an amplifying chamfer connected in sequence. The diameter of the jet section is no more than 3 / 1 the diameter of the cylindrical section. The tapering section has a cone angle of 20 to 45 degrees. The amplifying chamfer is located at the end of the jet section and has a chamfer angle of 30 degrees. The bubble generator is connected to the outer end of the second high-pressure air channel via a lock nut.

7. The micro-particle-scale dissolved air flotation apparatus for minerals according to any one of claims 1 to 5, characterized in that, The top plate of the foam tank shell is provided with a mounting hole for the hollow shaft to pass through, and a mounting seat is provided on the lower surface of the top plate at the position corresponding to the mounting hole. The upper end of the connecting pipe is connected and fixed to the mounting seat through a connecting flange.

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