Laboratory dissolved gas-ultrasonic flotation column device and method

Abstract

The invention relates to the technical field of pressurization / decompression, ultrasonic waves and mineral separation, and discloses a laboratory dissolved air-ultrasonic flotation column device and method.The laboratory dissolved air-ultrasonic flotation column device comprises a flotation column body, and an ultrasonic water tank is fixedly connected to one side of the flotation column body; the ultrasonic assembly comprises an ultrasonic generating part and an adjusting part, the ultrasonic generating part is arranged in the ultrasonic water tank and used for emitting ultrasonic waves to ore pulp in the flotation column, and the position, located in the ultrasonic water tank, of the ultrasonic generating part is adjusted through the adjusting part; the gas content measuring assembly comprises a plurality of pressure measuring pieces, and the pressure measuring pieces are arranged on the side, away from the ultrasonic water tank, of the flotation column body; and the pressurizing tank is used for conveying ore pulp into the flotation column body. The method is easy, convenient and efficient to operate, high in operation repeatability and stable in operation process, and has important guiding significance and practical significance in exploration and understanding of micro-nano bubble regulation and control and promotion action mechanism of micro-fine particle mineral flotation.

Description

Technical Field

[0001] The invention relates to the technical fields of pressure increase / decompression, ultrasonic wave and mineral separation, and in particular to a laboratory dissolved air-ultrasonic wave flotation column device and method. Background Art

[0002] Due to their small mass and large specific surface area, fine-grained minerals are prone to non-selective agglomeration between gangue particles and useful mineral particles, which can easily cause gangue entrainment during flotation. In addition, due to their small momentum, it is difficult for them to effectively collide and adsorb with bubbles during flotation, resulting in low recovery rates. In view of the above technical difficulties, the development of fine-grained mineral processing equipment can provide a more favorable pulp and flow field environment for fine-grained flotation, enhance the recovery of fine-grained minerals, and generate tiny bubbles through appropriate bubble foaming devices, which is more conducive to effective collision and adhesion of fine particles.

[0003] Flotation columns play an important role in the recovery of fine-particle minerals due to their advantages such as high enrichment ratio, small footprint, and low maintenance and operation costs. However, while flotation columns usually improve the grade of fine-particle concentrates, the concentrate recovery rate is difficult to be effectively guaranteed. Therefore, it is very important and meaningful to conduct in-depth research on flotation columns. The foaming methods of traditional flotation columns mainly include 1) spray gun foaming and 2) jet cavitation technology. Spray gun foaming of flotation columns is the most common foaming method. Spray gun foaming is that the volume of the emitted bubbles cannot be controlled during the growth process when the bubbles are countercurrent mineralized with the mineral particles. It is generally at the millimeter level and has limited ability to capture fine particles. Jet cavitation technology is that the slurry generates a high-speed jet through the Venturi tube, and micro-nano bubbles are directly precipitated on the mineral surface, which makes up for the problem of excessive bubbles caused by spray gun foaming. However, the disadvantage of jet cavitation is that the slurry particles passing through the Venturi tube should not be too large, and long-term jets cause greater wear on the Venturi tube, and the layout of the entire set of equipment is relatively complicated.

[0004] In view of the above problems, a method is invented to generate micro-nano bubbles directly on the surface of mineral particles, and at the same time effectively control the size of micro-nano bubbles to promote microbubble column flotation. The dissolved gas method is a process in which the liquid is first pressurized to a certain extent in a pressure vessel, the gas is dissolved in the liquid, and then the liquid is discharged to the normal pressure to precipitate bubbles. Introducing it into flotation can effectively solve the shortcomings of jet cavitation technology. By pressurizing the slurry and dissolving the gas and then releasing it under reduced pressure through the dissolved gas method, micro-nano bubbles can be precipitated directly on the surface of mineral particles without the need to add equipment such as venturi tubes, thus avoiding problems such as equipment wear. At the same time, ultrasound can emulsify flotation reagents, increase the dispersibility of reagents, improve the efficacy, improve flotation effect, and reduce the dosage; the core of ultrasonic cavitation is that when high-frequency ultrasound acts on liquid, it produces violent pressure fluctuations locally, produces cavitation phenomenon, and generates cavitation microbubbles; ultrasound of a certain frequency can break bubbles that are too large and control the growth of large bubbles; after the microbubbles burst, a large amount of energy is released, generating shock waves, liquid microjets and strong shear forces, which are also used in ore surface cleaning. However, since the volume of precipitated bubbles in dissolved air flotation is difficult to control, the generation of large bubbles can be inhibited to a certain extent through the regulation of ultrasound, and the content of micro-nano bubbles can be increased. The two are combined with each other, and their advantages are complementary. The use of reduced pressure dissolved air to provide micro-nano bubbles and the use of ultrasound to control the growth of micro-nano bubbles can improve the grade of concentrate while reducing the loss of recovery rate as much as possible, achieving the effect of "1+1>2". Therefore, the simultaneous introduction of dissolved air and ultrasonic systems in the flotation column has important theoretical significance and application value for the development and design of micro-fine mineral flotation and flotation columns. The development of single open-circuit small feed (feed less than 500g) flotation column equipment for the laboratory undoubtedly provides great convenience for mineral processing research.

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

[0006] The purpose of the present invention is to provide a laboratory dissolved air-ultrasonic flotation column device and method to solve the problems existing in the above-mentioned prior art.

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

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

[0009] An ultrasonic component, comprising an ultrasonic generator and an adjusting member, wherein the ultrasonic generator is disposed in the ultrasonic water tank and is used to emit ultrasonic waves to the slurry in the flotation column, and the ultrasonic generator is adjusted in position in the ultrasonic water tank by the adjusting member;

[0010] The gas content measuring component includes a number of pressure measuring parts, and several of the pressure measuring parts are respectively arranged on one side of the flotation column body away from the ultrasonic water tank.

[0011] The pressure vessel is used to convey pulp into the flotation column body.

[0012] According to a laboratory dissolved air-ultrasonic flotation column device provided by the present invention, the ultrasonic generating part includes an ultrasonic vibrating plate, and the ultrasonic vibrating plate is suspended in the ultrasonic water tank through the adjusting part.

[0013] According to a laboratory dissolved air-ultrasonic flotation column device provided by the present invention, the adjusting part includes a rope, one end of the rope is connected to the wall above the ultrasonic water tank, and the other end of the rope is detachably connected to the ultrasonic vibrating plate.

[0014] According to a laboratory dissolved air-ultrasonic flotation column device provided by the present invention, the pressure measuring part includes a pressure measuring valve port, and several of the pressure measuring valve ports are arranged on the side wall of the flotation column body at equal intervals along the axis.

[0015] According to a laboratory dissolved air-ultrasonic flotation column device provided by the present invention, a foam collection tank is fixedly connected to the top end of the flotation column body, a concentrate discharge port is opened on the foam collection tank, a tailing discharge port and a feed port are arranged at the bottom end of the flotation column body, and the feed port is communicated with a laboratory pressure vessel.

[0016] According to a laboratory dissolved air-ultrasonic flotation column device provided by the present invention, a microporous bubble foaming device is fixedly connected to the bottom end inside the flotation column body, an air inlet is opened at the bottom end of the flotation column body, and the microporous bubble foaming device is communicated with the air inlet.

[0017] According to a laboratory dissolved air-ultrasonic flotation column device provided by the present invention, 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 a laboratory dissolved air-ultrasonic flotation column device provided by the present invention, the pressure measuring valve port is a two-way pipe structure, and the pressure measuring valve port is connected to an external pressure instrument.

[0019] According to a laboratory dissolved air-ultrasonic flotation column device provided by the present invention, the flotation column body, the ultrasonic water tank and the foam collection tank are all made of transparent materials;

[0020] The flotation column body is of a regular square column structure.

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

[0022] Mix the ore pulp and the reagent in a beaker, place the beaker in a pressure tank, stir with a magnetic stirrer and pressurize the pressure tank at the same time, and dissolve the gas in the ore pulp under high pressure conditions;

[0023] The slurry is transported to the flotation column, so that the saturated gas-dissolved slurry is rapidly decompressed and released, and a large number of tiny bubbles are generated;

[0024] During the column flotation process, parallel propagating ultrasonic waves are generated by the ultrasonic generator 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] The present invention provides a laboratory dissolved air-ultrasonic flotation column device and method, wherein a pressure tank is connected to a feed port through a pipeline, and the saturated gas solution is rapidly decompressed and released into the flotation column. An ultrasonic water tank is located on one side of the flotation column, and ultrasonic waves are emitted to the slurry in the flotation column through an ultrasonic generator. Ultrasonic waves of different frequencies and power models can be selected, and the position of the ultrasonic generator in the ultrasonic water tank can be adjusted through an adjustment part to regulate bubbles and flotation behaviors during the flotation process, thereby improving the flotation efficiency. The gas content of the slurry at different positions is measured through a gas content measurement component. The present application is simple and efficient to operate, has high repeatability, and a stable operation process. It has important guiding significance and practical significance for exploring and understanding the regulation of micro-nano bubbles and the mechanism of promoting the flotation of fine-grained minerals. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor:

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

[0029] Figure 2 For the present invention Figure 1 A partial enlarged view of the middle part;

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

[0031] Figure 4 For the present invention Figure 3 A partial enlarged view of point B in the middle;

[0032] Among them, 1. foam collection tank; 2. concentrate discharge port; 3. flotation column; 4. tailings discharge port; 5. inflation port; 6. microporous bubble foamer; 7. ultrasonic water tank; 8. ultrasonic vibration plate; 9. pressure measuring valve port; 10. ore feeding port; 11. laboratory pressure tank; 12. rope. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Reference Figure 1-Figure 4 The present invention provides a laboratory dissolved air-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 member. The ultrasonic generator is disposed in the ultrasonic water tank 7 and is used to emit ultrasonic waves to the slurry in the flotation column 3. The ultrasonic generator is adjusted in position in the ultrasonic water tank 7 by the adjusting member.

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

[0039] The pressurized tank 11 is used to transport the 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, and ultrasonic waves are emitted to the slurry in the flotation column 3 through the ultrasonic generator. Ultrasonic generators of different frequencies and power models can be selected, and the position of the ultrasonic generator in the ultrasonic water tank 7 can be adjusted through the adjustment part to control the bubbles and flotation behavior during the flotation process, thereby improving the flotation efficiency. The gas content of the slurry at different positions can be measured through the gas content measuring component.

[0041] As an optional implementation, the ultrasonic generating element includes an ultrasonic vibration plate 8, and the ultrasonic vibration plate 8 is suspended in the ultrasonic water tank 7 through an adjusting element.

[0042] In one embodiment of the present invention, ultrasonic waves are emitted to the slurry inside the flotation column 3 through the ultrasonic vibration plate 8 .

[0043] As an optional implementation, the adjusting member includes a rope 12 , one end of the rope 12 is connected to the wall directly above the ultrasonic water tank 7 , and the other end of the rope 12 is detachably connected to the ultrasonic vibration plate 8 .

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

[0045] As an optional implementation, the pressure measuring member includes a pressure measuring valve port 9 , and a plurality of pressure measuring valve ports 9 are axially arranged at equal intervals 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 used as ore inlets at different heights as required. The pressure measuring valve ports 9 at different heights can respectively measure the gas content of the slurry pressure in the flotation column 3.

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

[0048] In one embodiment of the present invention, the ore pulp enters the flotation column 3 from the ore feeding port 10 , the foam collecting 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 foamer 6 is fixedly connected to the bottom end of the flotation column 3 , and an air filling port 5 is opened at the bottom end of the flotation column 3 , and the microporous bubble foamer 6 is connected to the air filling port 5 .

[0050] In one embodiment of the present invention, the ore pulp inside the flotation column 3 is foamed by the provided air filling port 5 and the micro-bubble foamer 6 .

[0051] As an optional implementation, the bottom end of the foam collecting 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 end of the foam collecting tank 1 is inclined, and specifically may be an overflow tank with an inclined surface, and the concentrate discharge port 2 corresponds to the lowest end of the overflow tank with an inclined surface.

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

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

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

[0056] The flotation column 3 is a square column structure.

[0057] In one embodiment of the present invention, the flotation column 3, the ultrasonic water tank 7 and the foam collecting tank 1 are all made of transparent materials for easy 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. The ultrasonic wave is released on one side of the flotation column 3 and measured on the other side, so as to accurately measure the influence of the ultrasonic wave on the slurry.

[0059] A laboratory dissolved air-ultrasonic flotation method comprises the following steps:

[0060] The ore pulp and the reagent are mixed in a beaker, and the gas is dissolved in the ore pulp under high pressure;

[0061] The slurry is transported to the flotation column 3, so that the saturated gas-dissolved slurry is rapidly decompressed and released to generate a large number of tiny bubbles;

[0062] During the column flotation process, parallel propagating ultrasonic waves are generated by the ultrasonic generator 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 ore pulp and the reagent in a beaker, and the gas is dissolved in the ore pulp under high pressure through a laboratory pressure tank 11, and then the ore pulp is fed into a new laboratory ultrasonic flotation column device through a feed port 10, so that the saturated gas-dissolved ore pulp is quickly decompressed and released to generate a large number of tiny bubbles. During the column flotation process, parallel propagation ultrasonic waves are generated by an ultrasonic vibration plate 8 to form a specific sound field, which 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-nano bubbles, and the bubble size is regulated to achieve improved mineral processing efficiency.

[0064] The working principle of the present invention is that the present invention introduces a pressure dissolved air device and an ultrasonic device into the flotation column system. Micro-nano bubbles are generated on the surface of mineral particles through pressure dissolved air. At the same time, by using ultrasonic cavitation or ultrasonic standing wave technology, when high-frequency ultrasonic waves act on the liquid, violent pressure fluctuations are generated locally, resulting in cavitation phenomena and generating cavitation micro-bubbles. After the micro-bubbles burst, a large amount of energy is released, generating shock waves, liquid micro-jets and shear forces, which have a good effect on cleaning the ore surface; the standing wave type ultrasonic device forms a specific sound field by generating ultrasonic waves propagating in parallel, uses the secondary acoustic radiation force to attract fine-grained mineral particles, and makes the bubbles gather at the sound pressure nodes, thereby promoting the aggregation of bubbles and fine-grained mineral particles; the mechanical force brought by the ultrasonic wave has a regulating effect on the bubbles, enabling the bubbles to grow within a certain size range, reducing the proportion of large bubbles in the pulp, and being beneficial to the capture of fine-grained minerals.

[0065] Based on the power ultrasonic application technology, the present invention artificially intervenes and regulates the size of nano-bubbles by applying an external force field, inhibits the growth of nano-bubbles, avoids the excessive and rapid growth of flocs, and thus reduces the possibility of floc entrainment. By changing the frequency and position of the ultrasonic vibration plate 8, the bubbles and flotation behavior in the flotation process are regulated, which has important research significance for improving the flotation efficiency and the optimization and design of the flotation column.

[0066] The present invention adopts the dissolved air-ultrasonic combined flotation technology, which can quickly reach the required flotation indexes in a smaller flotation container, can be compared with the indexes of conventional flotation machines and flotation columns, and the pulp does not need to be circulated for feeding. This avoids the situation of large feeding amount (usually several kilograms of raw materials need to be prepared) and circulating feeding in traditional flotation columns. Single-step rough selection is carried out at one time, and the minimum feeding amount is dozens of grams per time. The experimental requirements of the flotation column are greatly simplified, which greatly improves the operability and convenience of the laboratory test of the flotation column, making the operation of the laboratory flotation column test no longer cumbersome and becoming routine.

[0067] In one embodiment of the present invention:

[0068] Experiment 1: Adjust the ultrasonic intensity to 20 kHz, the ultrasonic intensity is 0.1 A, the ultrasonic area is 1 / 3, the ultrasonic position is the same as the height of the column flotation liquid surface, and the maximum amount is the pressure valve 0.1 MPa. The actual ore sample used in the experiment is 350 g of apatite. The concentrate is filtered and dried, and then analyzed. The recovery rate of the concentrate is 65.21%, and the grade of the concentrate is 21.43%.

[0069] Set control group 1: Float the ore sample of Experiment 1 with a conventional flotation machine. The feeding amount is 350 g, the capacity of the flotation cell used is 1 L, and its reagent system is the same as that of Experiment 1. One roughing and one cleaning closed-circuit test is adopted, and the concentrate P 2 O 5 The recovery rate is 84.23%, and the concentrate P2 O 5 The grade is 15.83%;

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

[0071] Through experiment 1, control group 1-2, it can be seen that in the concentrate P 2 O 5 In terms of recovery rate, flotation machine > conventional flotation column > ultrasonic flotation column; in concentrate P 2 O 5 In terms of grade, ultrasonic flotation column > conventional flotation column > flotation machine.

[0072] In summary, the use of the laboratory ultrasonic flotation column equipment of the present invention for flotation of fine-grained minerals can significantly improve the grade of the concentrate, achieve the effect of regulating the size of micro-nano bubbles and the aggregation of fine-grained flocs, and can also improve the flotation separation efficiency and improve the fine-grained mineral sorting index.

[0073] Test 2:

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

[0075] Control group 3 was set up: the iron tailings containing low-grade copper in experiment 2 were flotated by a conventional flotation machine. The feed amount was 300g, the capacity of the flotation cell used was 0.75L, and the reagent system was the same as that in experiment 2. The experimental process of one coarse and two fine open circuit flotation was adopted. The flotation obtained a concentrate recovery rate of 64.25% and a concentrate grade of 5.14%.

[0076] It can be seen from Experiment 2 and Control Group 3 that, compared with conventional flotation machines, the use of the laboratory ultrasonic flotation column equipment of the present invention to flotate and separate copper and sulfur in iron tailings can significantly improve the recovery of copper in iron tailings, improve the flotation separation efficiency, and enhance the fine-grained mineral sorting index.

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

[0078] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A laboratory dissolved air-ultrasonic flotation column device, 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, comprising an ultrasonic generator and an adjusting member, wherein the ultrasonic generator is arranged in the ultrasonic water tank (7) and is used to emit ultrasonic waves to the ore pulp in the flotation column (3), and the position of the ultrasonic generator in the ultrasonic water tank (7) is adjusted by the adjusting member; A gas content measuring component, comprising a plurality of pressure measuring components, wherein the plurality of pressure measuring components are respectively arranged on a side of the flotation column (3) away from the ultrasonic water tank (7); The pressure tank (11) is used to transport the ore pulp into the flotation column (3).

2. A laboratory dissolved air-ultrasonic flotation column device according to claim 1, characterized in that: The ultrasonic wave generating element comprises an ultrasonic wave vibrating plate (8), and the ultrasonic wave vibrating plate (8) is suspended in the ultrasonic wave water tank (7) through the adjusting element.

3. A laboratory dissolved air-ultrasonic flotation column device according to claim 2, characterized in that: The adjusting member comprises a rope (12), one end of the rope (12) is connected to the wall directly above the ultrasonic water tank (7), and the other end of the rope (12) is detachably connected to the ultrasonic vibration plate (8).

4. A laboratory dissolved air-ultrasonic flotation column device according to claim 1, characterized in that: The gas content measuring component comprises 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).

5. A laboratory dissolved air-ultrasonic flotation column device according to claim 1, characterized in that: The top of the flotation column (3) is fixedly connected to a foam collecting tank (1), a concentrate discharge port (2) is provided on the foam collecting tank (1), and the bottom of the flotation column (3) is provided with a tailings discharge port (4) and a feed port (10), and the feed port (10) is connected to a laboratory pressure tank (11).

6. A laboratory dissolved air-ultrasonic flotation column device according to claim 1, characterized in that: A microporous bubble foamer (6) is fixedly connected to the bottom end of the flotation column (3), and an air charging port (5) is provided at the bottom end of the flotation column (3), and the microporous bubble foamer (6) is in communication with the air charging port (5).

7. A laboratory dissolved air-ultrasonic flotation column device according to claim 5, characterized in that: The bottom end of the foam collecting trough (1) is arranged to be inclined, and the concentrate discharge port (2) is located at the lowest end of the inclined surface.

8. A laboratory dissolved air-ultrasonic flotation column device according to claim 4, characterized in that: The pressure measuring valve port (9) is a two-branch pipe structure, and the pressure measuring valve port (9) is connected to an external pressure meter.

9. A laboratory dissolved air-ultrasonic flotation column device according to claim 5, characterized in that: The flotation column (3), the ultrasonic water tank (7) and the foam collection tank (1) are all made of transparent materials; The flotation column (3) is a square column structure.

10. A laboratory dissolved air-ultrasonic flotation method, applicable to a laboratory dissolved air-ultrasonic flotation column device according to claim 1, characterized in that: The following steps are involved: The ore pulp and the reagent are mixed in a beaker, and the gas is dissolved in the ore pulp under high pressure; The ore pulp is transported to the flotation column (3), so that the saturated gas-dissolved ore pulp is rapidly depressurized and released to generate a large number of tiny bubbles; During the column flotation process, the ore pulp is pressurized by the pressure tank (11) and then released into the flotation column (3), generating a large number of micro-nano bubbles on the surface of the mineral. At the same time, the ultrasonic generator generates parallel propagating ultrasonic waves to form a specific sound field, which promotes the miniaturization of bubbles and the aggregation of mineral particles.

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