A laboratory dissolved air-ultrasonic flotation column apparatus and method

Abstract

The present application relates to the technical field of pressure increase / decrease, ultrasonic and mineral processing, and discloses a laboratory dissolved air-ultrasonic flotation column device and method, which comprises a flotation column body, one side of the flotation column body being fixedly connected with an ultrasonic water tank; an ultrasonic assembly, comprising an ultrasonic generating part and an adjusting part, the ultrasonic generating part being arranged in the ultrasonic water tank and used for emitting ultrasonic waves to the ore pulp in the flotation column body, the position of the ultrasonic generating part in the ultrasonic water tank being adjusted by the adjusting part; a gas content measuring assembly, comprising a plurality of pressure measuring parts, the plurality of pressure measuring parts being respectively arranged on the side of the flotation column body away from the ultrasonic water tank; and a pressurized tank used for conveying ore pulp to the flotation column body. The present application is simple and efficient to operate, has high operation repeatability and stable operation process, and has important guiding significance and practical significance for exploring and understanding the regulation and control of micro-nano bubbles and the promotion mechanism of micro-fine particle mineral flotation.

Description

Technical Field

[0001] This invention relates to the fields of pressure / depression, ultrasound, and mineral processing, and in particular to a laboratory dissolved gas-ultrasonic flotation column apparatus and method. Background Technology

[0002] Fine-grained minerals, due to their small mass and large specific surface area, are prone to non-selective agglomeration between gangue and valuable mineral particles, easily causing gangue entrainment during flotation. Furthermore, their low momentum makes effective collision and adsorption with air bubbles difficult, resulting in low recovery rates. To address these technical challenges, the development of fine-particle beneficiation equipment can provide a more favorable slurry and flow field environment for fine-particle flotation, enhancing the recovery of fine minerals. The generation of microbubbles through suitable bubble-generating devices further facilitates effective collision and adhesion of fine particles.

[0003] Flotation columns play a vital role in the recovery of fine-grained minerals due to their advantages such as high enrichment ratio, small footprint, and low maintenance and operating costs. However, while improving the grade of fine-grained concentrates, the recovery rate is often difficult to guarantee effectively. Therefore, in-depth research on flotation columns is crucial and meaningful. Traditional flotation column foaming methods mainly include 1) lance foaming and 2) jet cavitation technology. Lance foaming is the most common method, but its volume is uncontrollable during the countercurrent mineralization process with mineral particles, typically remaining at the millimeter level, limiting its ability to capture fine particles. Jet cavitation technology, on the other hand, generates a high-speed jet of slurry through a venturi tube, directly precipitating micro- and nano-bubbles on the mineral surface, thus overcoming the problem of excessively large bubbles caused by lance foaming. However, jet cavitation has drawbacks: the slurry particles passing through the venturi tube should not be too large, long-term jet flow causes significant wear on the venturi tube, and the overall equipment layout is more complex.

[0004] To address the aforementioned issues, a method has been invented that can directly generate micro- and nano-bubbles on the surface of mineral particles while effectively controlling their size to promote microbubble column flotation. The dissolved gas method involves first pressurizing a liquid in a pressure vessel to dissolve gas into the liquid, then discharging the liquid back to atmospheric pressure to allow the bubbles to precipitate and be introduced into flotation. This effectively overcomes the shortcomings of jet cavitation technology. By pressurizing the slurry to dissolve gas and then depressurizing to release it, micro- and nano-bubbles can be directly precipitated on the surface of mineral particles without the need for additional equipment such as venturi tubes, thus avoiding equipment wear and tear. Meanwhile, ultrasound can emulsify flotation reagents, increasing their dispersibility and improving their efficacy, thus enhancing flotation results and reducing reagent dosage. The core of ultrasonic cavitation lies in the intense pressure fluctuations generated locally when high-frequency ultrasound acts on a liquid, producing cavitation and generating cavitation microbubbles. Ultrasound at a certain frequency can break up excessively large bubbles, controlling their growth. The bursting of microbubbles releases a large amount of energy, generating shock waves, liquid microjets, and strong shear forces, which are also used in ore surface cleaning. In dissolved air flotation, due to the difficulty in controlling the volume of precipitated bubbles, ultrasound modulation can, to some extent, suppress the formation of large bubbles and increase the content of micro- and nano-bubbles. Combining these two technologies offers complementary advantages: using depressurized dissolved air to provide micro- and nano-bubbles and using ultrasound to control their growth can improve concentrate grade while minimizing recovery loss, achieving a "1+1>2" effect. Therefore, simultaneously introducing a dissolved air and ultrasonic system into the flotation column has significant theoretical and practical value for the development and design of flotation columns for fine-grained minerals. The development of flotation column equipment for small single-pass open-circuit feed (feed less than 500g) in the laboratory has undoubtedly provided great convenience for mineral processing research.

[0005] Therefore, there is an urgent need for a laboratory dissolved gas-ultrasonic flotation column device and testing method to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a laboratory dissolved gas-ultrasonic flotation column apparatus and method to solve the problems existing in the prior art.

[0007] To achieve the above objectives, the present invention provides the following solution: The present invention provides a laboratory dissolved gas-ultrasonic flotation column device, comprising a flotation column,

[0008] An ultrasonic water tank is fixedly connected to one side of the flotation column.

[0009] An ultrasonic component includes an ultrasonic generator and an adjusting component. The ultrasonic generator is disposed in the ultrasonic water tank and is used to emit ultrasonic waves to the slurry in the flotation column. The ultrasonic generator is adjusted to its position in the ultrasonic water tank by the adjusting component.

[0010] The gas content measuring component includes several pressure measuring elements, which are respectively disposed on the side of the flotation column away from the ultrasonic water tank.

[0011] A pressurized tank is used to deliver slurry into the flotation column.

[0012] According to the present invention, a laboratory dissolved gas-ultrasonic flotation column device is provided, wherein the ultrasonic generating element includes an ultrasonic transducer plate, and the ultrasonic transducer plate is suspended in the ultrasonic water tank by the adjusting element.

[0013] According to the present invention, a laboratory dissolved gas-ultrasonic flotation column device is provided, wherein the adjusting component includes a rope, one end of which is connected to the wall directly above the ultrasonic water tank, and the other end of which is detachably connected to the ultrasonic transducer plate.

[0014] According to the present invention, a laboratory dissolved gas-ultrasonic flotation column device is provided, wherein the pressure measuring element includes a pressure measuring valve port, and a plurality of the pressure measuring valve ports are arranged at equal intervals along the axial direction on the side wall of the flotation column.

[0015] According to the present invention, a laboratory dissolved gas-ultrasonic flotation column device is provided, wherein a foam collection tank is fixedly connected to the top of the flotation column, a concentrate discharge port is provided on the foam collection tank, and a tailings discharge port and a feed port are provided at the bottom of the flotation column, the feed port being connected to a laboratory pressurization tank.

[0016] According to the present invention, a laboratory dissolved gas-ultrasonic flotation column device is provided, wherein a microporous bubble generator is fixedly connected to the bottom of the flotation column, and an air inlet is provided at the bottom of the flotation column, and the microporous bubble generator is connected to the air inlet.

[0017] According to the present invention, a laboratory dissolved gas-ultrasonic flotation column device is provided, wherein the bottom end of the foam collection tank is inclined and the concentrate discharge port is located at the lowest end of the inclined surface.

[0018] According to the present invention, a laboratory dissolved gas-ultrasonic flotation column device is provided, wherein the pressure measuring valve port is a two-part pipe structure and the pressure measuring valve port is connected to an external pressure gauge.

[0019] According to the present invention, a laboratory dissolved gas-ultrasonic flotation column device is provided, wherein the flotation column, the ultrasonic water tank and the foam collection tank are all made of transparent material;

[0020] The flotation column has a square column structure.

[0021] A laboratory dissolved gas-ultrasonic flotation method includes the following steps:

[0022] The slurry and reagents are mixed in a beaker, which is then placed in a pressure vessel. The vessel is stirred with a magnetic stirrer while being pressurized, and the gas is dissolved in the slurry under high pressure.

[0023] The slurry is fed into the flotation column, where the saturated dissolved gas slurry is rapidly depressurized and released, generating a large number of tiny bubbles.

[0024] During the column flotation process, ultrasonic waves are generated in parallel to form a specific sound field, which promotes the aggregation of bubbles and mineral particles.

[0025] Compared with the prior art, the present invention has the following advantages and technical effects:

[0026] This invention provides a laboratory dissolved gas-ultrasonic flotation column apparatus and method. A pressurized tank is connected to the feed inlet via a pipeline, rapidly depressurizing and releasing a saturated gas solution into the flotation column. An ultrasonic water tank is located on one side of the flotation column. Ultrasonic waves are emitted into the slurry within the flotation column by an ultrasonic generator. Different frequencies and power models of ultrasonic generators can be selected, and the position of the ultrasonic generator within the ultrasonic water tank can be adjusted by a regulating component to control the bubbles and flotation behavior during the flotation process, thereby improving flotation efficiency. A gas content measuring component is used to determine the gas content of the slurry at different locations. This application is simple and efficient to operate, has high repeatability, and a stable operating process. It has significant guiding and practical significance for exploring and understanding the control of micro- and nano-bubbles and their promoting mechanism in the flotation of fine-grained minerals. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a side view of the overall structure of the present invention;

[0029] Figure 2 For the present invention Figure 1 Enlarged view of a portion of point A in the middle;

[0030] Figure 3 This is a front view of the overall structure of the present invention;

[0031] Figure 4 For the present invention Figure 3 Enlarged view of a section at point B in the middle;

[0032] Among them, 1. foam collection tank; 2. concentrate discharge port; 3. flotation column; 4. tailings discharge port; 5. air inlet; 6. microporous bubble generator; 7. ultrasonic water tank; 8. ultrasonic vibrating plate; 9. pressure measuring valve port; 10. feed port; 11. laboratory pressure tank; 12. rope. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0034] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Reference Figures 1-4 This invention provides a laboratory dissolved gas-ultrasonic flotation column device, comprising a flotation column 3.

[0036] An ultrasonic water tank 7 is fixedly connected to one side of the flotation column 3;

[0037] The ultrasonic component includes an ultrasonic generator and an adjusting component. The ultrasonic generator is installed in the ultrasonic water tank 7 and is used to emit ultrasonic waves into the slurry in the flotation column 3. The ultrasonic generator is adjusted to its position in the ultrasonic water tank 7 by the adjusting component.

[0038] The gas content measuring component includes several pressure measuring elements, which are respectively arranged on the side of the flotation column 3 away from the ultrasonic water tank 7.

[0039] The pressure tank 11 is used to transport slurry into the flotation column 3.

[0040] In one embodiment of the present invention, the ultrasonic water tank 7 is located on one side of the flotation column 3. Ultrasonic waves are emitted into the slurry in the flotation column 3 by an ultrasonic generator. Different ultrasonic generators with different frequencies and power models can be selected. The position of the ultrasonic generator in the ultrasonic water tank 7 can be adjusted by an adjusting component to control the bubbles and flotation behavior during the flotation process, thereby improving the flotation efficiency. The gas content of the slurry at different locations is measured by a gas content measuring component.

[0041] As an optional implementation, the ultrasonic generator includes an ultrasonic transducer 8, which is suspended in the ultrasonic water tank 7 by an adjusting member.

[0042] In one embodiment of the present invention, ultrasonic waves are emitted into the slurry inside the flotation column 3 by means of an ultrasonic transducer 8.

[0043] As an optional implementation, the adjustment component includes a rope 12, one end of which is connected to the wall directly above the ultrasonic water tank 7, and the other end of which is detachably connected to the ultrasonic transducer 8.

[0044] In one embodiment of the present invention, the position of the ultrasonic transducer 8 inside the ultrasonic water tank 7 can be adjusted by the connected rope 12. At the same time, the frequency and power of the ultrasonic transducer 8 can be set according to the specific research environment and requirements by changing the suspension height and frequency of the ultrasonic transducer 8.

[0045] As an optional implementation, the pressure measuring element includes a pressure measuring valve port 9, and a plurality of pressure measuring valve ports 9 are arranged at equal intervals along the axial direction on the side wall of the flotation column 3.

[0046] In one embodiment of the present invention, a plurality of pressure measuring valve ports 9 are arranged at equal intervals along the axial direction on the side wall of the flotation column 3. The plurality of pressure measuring valve ports 9 can be made into ore inlets of different heights as needed. The pressure measuring valve ports 9 of different heights can respectively measure the gas content of the slurry pressure inside the flotation column 3.

[0047] As an optional implementation, a foam collection tank 1 is fixedly connected to the top of the flotation column 3. A concentrate discharge port 2 is provided on the foam collection tank 1. A tailings discharge port 4 and a feed port 10 are provided at the bottom of the flotation column 3. The feed port 10 is connected to the laboratory pressurization tank 11.

[0048] In one embodiment of the present invention, the slurry enters the flotation column 3 from the feed port 10, the froth collection tank 1 is used to collect the concentrate, the concentrate flows out from the concentrate discharge port 2, and the tailings flow out from the tailings discharge port 4.

[0049] As an optional implementation, a microporous bubble generator 6 is fixedly connected to the bottom of the flotation column 3, and an air inlet 5 is opened at the bottom of the flotation column 3, with the microporous bubble generator 6 connected to the air inlet 5.

[0050] In one embodiment of the present invention, the slurry inside the flotation column 3 is foamed through the air inlet 5 and the microporous bubble foamer 6.

[0051] As an optional implementation, the bottom of the foam collection tank 1 is inclined, and the concentrate discharge port 2 is located at the lowest end of the inclined surface.

[0052] In one embodiment of the present invention, the bottom of the foam collection tank 1 is inclined, specifically it can be an overflow tank with an inclined surface, and the concentrate discharge port 2 corresponds to the lowest end of the inclined surface overflow tank.

[0053] As an optional implementation, the pressure measuring valve port 9 has a two-pipe structure and is connected to an external pressure gauge.

[0054] In one embodiment of the present invention, the pressure of the slurry inside the flotation column 3 is measured by a hydraulic measuring instrument at pressure measuring valve ports 9 at different heights, so that the test operator can read the pressure data.

[0055] As an optional implementation, the flotation column 3, the ultrasonic water tank 7, and the foam collection tank 1 are all made of transparent material;

[0056] Flotation column 3 has a square column structure.

[0057] In one embodiment of the present invention, the flotation column 3, the ultrasonic water tank 7, and the foam collection tank 1 are all made of transparent material, which facilitates observation.

[0058] In one embodiment of the present invention, the flotation column 3 is a square column structure, and the ultrasonic water tank 7 is located on one side of the square column structure. Ultrasonic waves are released from one side of the flotation column 3, and measurements are taken from the other side, which facilitates accurate measurement of the impact of ultrasound on the slurry.

[0059] A laboratory dissolved gas-ultrasonic flotation method includes the following steps:

[0060] The slurry and reagents are mixed in a beaker, and the gas is dissolved in the slurry under high pressure.

[0061] The slurry is fed into flotation column 3, where the saturated dissolved gas slurry is rapidly depressurized and released, generating a large number of tiny bubbles.

[0062] During the column flotation process, ultrasonic waves are generated in parallel to form a specific sound field, which promotes the aggregation of bubbles and mineral particles.

[0063] In one embodiment of the present invention, a magnetic stirring device is used to mix the slurry and reagents in a beaker. The gas is dissolved in the slurry under high pressure through a laboratory pressurization tank 11. The slurry is then fed into a novel laboratory ultrasonic flotation column device through the feed port 10, which rapidly depressurizes and releases the saturated dissolved gas slurry, generating a large number of microbubbles. During the column flotation process, parallel propagating ultrasonic waves are generated by the ultrasonic transducer 8, forming a specific sound field that promotes the aggregation of bubbles and mineral particles. The cavitation phenomenon generated when high-frequency ultrasonic waves act on the liquid accelerates the generation of micro- and nano-bubbles. The bubble size can be controlled to improve the beneficiation efficiency.

[0064] The working principle of this invention is as follows: This invention introduces a pressure dissolved gas device and an ultrasonic device into the flotation column system. Pressure dissolved gas generates micro- and nano-bubbles on the surface of mineral particles. Simultaneously, ultrasonic cavitation or ultrasonic standing wave technology is utilized. When high-frequency ultrasonic waves act on the liquid, localized and intense pressure fluctuations are generated, producing cavitation and generating cavitation microbubbles. The rupture of these microbubbles releases a large amount of energy, generating shock waves, liquid microjets, and shear forces, which effectively clean the ore surface. The standing wave ultrasonic device generates parallel-propagating ultrasonic waves to form a specific sound field. Secondary acoustic radiation forces attract fine mineral particles and cause bubbles to aggregate at sound pressure nodes, thereby promoting the aggregation of bubbles and fine mineral particles. The mechanical force generated by the ultrasound has a regulatory effect on the bubbles, causing them to grow within a certain size range, reducing the proportion of large bubbles in the slurry, and facilitating the capture of fine mineral particles.

[0065] This invention, based on power ultrasound application technology, artificially intervenes and controls the size of nanobubbles by applying an external force field, thereby inhibiting nanobubble growth and preventing excessively large and rapid floc growth, thus reducing the possibility of floc entrainment. By changing the frequency and position of the ultrasonic transducer 8, the bubble and flotation behavior during the flotation process can be controlled, which is of significant research value for improving flotation efficiency and optimizing and designing the flotation column.

[0066] This invention employs dissolved air-ultrasonic combined flotation technology, which can rapidly achieve the required flotation parameters within a relatively small flotation vessel. These parameters are comparable to those of conventional flotation machines and columns, and the slurry does not require recycling. This avoids the need for large feed volumes (typically several kilograms of raw material) and recycling in traditional flotation columns. Single-step roughing with a low feed volume of only tens of grams per batch greatly simplifies the experimental requirements of flotation columns. This significantly improves the operability and convenience of laboratory testing for flotation columns, making laboratory flotation column testing less cumbersome and more routine.

[0067] In one embodiment of the present invention:

[0068] Experiment 1: The ultrasonic intensity was adjusted to 20 kHz, the ultrasonic strength to 0.1 A, the ultrasonic area to 1 / 3, and the ultrasonic position relative to the height of the column flotation liquid level, with a pressure valve pressure of at most 0.1 MPa. The actual ore sample used in the experiment was 350 g of apatite. The concentrate was filtered, dried, and analyzed. The concentrate recovery rate was 65.21%, and the concentrate grade was 21.43%.

[0069] Control group 1: The ore sample from test 1 was subjected to conventional flotation using a conventional flotation machine with a feed rate of 350g and a flotation cell capacity of 1L. The reagent regime was the same as that in test 1. A closed-circuit test with one rougher and one cleaner was adopted. The P2O5 recovery rate of the concentrate obtained by flotation was 84.23%, and the P2O5 grade of the concentrate was 15.83%.

[0070] Control group 2: The ore sample from test 1 was subjected to conventional flotation column test with a feed rate of 350g. The reagent system and other flotation conditions and related operations were the same as those in test 1. The concentrate recovery rate obtained by conventional column flotation was 70.23%, and the concentrate grade was 17.86%.

[0071] Experiment 1 and control groups 1-2 show that, in terms of P2O5 recovery rate in concentrate, flotation machine > conventional flotation column > ultrasonic flotation column; and in terms of P2O5 grade in concentrate, ultrasonic flotation column > conventional flotation column > flotation machine.

[0072] In summary, the laboratory ultrasonic flotation column equipment of this invention can significantly improve the concentrate grade, control the size of micro- and nano-bubbles and the aggregation of micro-particle flocs, improve flotation separation efficiency, and enhance the separation index of micro- and fine-particle minerals.

[0073] Experiment 2:

[0074] The difference between this experiment and Experiment 1 is that the actual ore sample used in this experiment was 300g of iron tailings containing ultra-low grade copper. Under the same flotation conditions as Experiment 1, an ultrasonic column flotation test was conducted, and the Cu grade of the flotation concentrate obtained was 7.64%, and the concentrate recovery rate was 56.82%.

[0075] Control group 3: The iron tailings containing low-grade copper from Experiment 2 were subjected to conventional flotation. The feed rate was 300g, the capacity of the flotation cell was 0.75L, and the reagent system was the same as that in Experiment 2. The experimental process of open-circuit flotation with one rougher and two cleaners was adopted. The concentrate recovery rate was 64.25%, and the concentrate grade was 5.14%.

[0076] Experiment 2 and control group 3 show that, compared with conventional flotation machines, the use of the laboratory ultrasonic flotation column equipment of this invention for flotation separation of copper and sulfur in iron tailings can significantly improve the recovery of copper in iron tailings, increase flotation separation efficiency, and improve the separation index of fine-grained minerals.

[0077] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0078] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A laboratory dissolved gas-ultrasonic flotation column apparatus, comprising a flotation column (3), characterized in that: An ultrasonic water tank (7) is fixedly connected to one side of the flotation column (3); An ultrasonic component includes an ultrasonic generator and an adjusting component. The ultrasonic generator is disposed in the ultrasonic water tank (7) and is used to emit ultrasonic waves into the slurry in the flotation column (3). The position of the ultrasonic generator in the ultrasonic water tank (7) is adjusted by the adjusting component. The gas content measuring component includes several pressure measuring elements, which are respectively disposed on the side of the flotation column (3) away from the ultrasonic water tank (7); A pressure tank (11) is used to deliver slurry into the flotation column (3); The ultrasonic generator includes an ultrasonic transducer (8), which is suspended in the ultrasonic water tank (7) by the adjusting member. The adjusting component includes a rope (12), one end of which is connected to the wall directly above the ultrasonic water tank (7), and the other end of which is detachably connected to the ultrasonic vibrating plate (8). The gas content measuring component includes a pressure measuring valve port (9), and a plurality of the pressure measuring valve ports (9) are arranged at equal intervals along the axial direction on the side wall of the flotation column (3); The top of the flotation column (3) is fixedly connected to a foam collection tank (1), and a concentrate discharge port (2) is opened on the foam collection tank (1). The bottom of the flotation column (3) is provided with a tailings discharge port (4) and a feed port (10). The feed port (10) is connected to a laboratory pressurization tank (11). The flotation column (3), the ultrasonic water tank (7), and the foam collection tank (1) are all made of transparent material; The flotation column (3) has a square column structure.

2. The laboratory dissolved gas-ultrasonic flotation column apparatus according to claim 1, characterized in that: A microporous bubble generator (6) is fixedly connected to the bottom of the flotation column (3), and an air inlet (5) is opened at the bottom of the flotation column (3). The microporous bubble generator (6) is connected to the air inlet (5).

3. The laboratory dissolved gas-ultrasonic flotation column apparatus according to claim 1, characterized in that: The bottom of the foam collection tank (1) is inclined, and the concentrate discharge port (2) is located at the lowest end of the inclined surface.

4. The laboratory dissolved gas-ultrasonic flotation column apparatus according to claim 1, characterized in that: The pressure testing valve port (9) has a two-part pipe structure and is connected to an external pressure gauge.

5. A laboratory dissolved gas-ultrasonic flotation method, applicable to the laboratory dissolved gas-ultrasonic flotation column apparatus as described in claim 1, characterized in that, Includes the following steps: The slurry and reagents are mixed in a beaker, and the gas is dissolved in the slurry under high pressure. The slurry is fed into the flotation column (3) to rapidly depressurize and release the saturated dissolved gas slurry and generate a large number of tiny bubbles; During column flotation, the slurry is pressurized by the pressurizing tank (11) and then released into the flotation column (3), generating a large number of micro-nano bubbles on the mineral surface. At the same time, the ultrasonic generator generates parallel propagating ultrasonic waves, forming a specific sound field, which promotes the miniaturization of bubbles and the aggregation of mineral particles.

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