Microbubble generating device and microbubble experimental flotation column used therein

Abstract

The present invention discloses a microbubble generating device and a microbubble experimental flotation column used therein. The microbubble generating device includes a rotating seal seat and a rotating component. The rotating seal seat is fixedly arranged and provided with an air inlet interface. The rotating component is rotatably assembled on the rotating seal seat. The rotating component is provided with a plurality of air outlet micropores. The air outlet micropores are connected to the air inlet interface on the rotating seal seat through the air flow channel inside the rotating component and the rotating seal seat. The rotating component is immersed in liquid and rotates. The gas discharged from the air outlet micropores on the rotating component is sheared by the liquid to form microbubbles. The microbubble experimental flotation column of the present invention uses the microbubble generating device to rotate at high speed in the ore pulp to generate a large number of micron-sized bubbles. The bubbles are evenly distributed, stable, and the gas volume is easy to control. The bubble size and ore pulp turbulence can be adjusted and controlled, providing technical support for the efficient separation of fine-grained minerals and materials, and greatly improving the efficiency of mineral flotation tests.

Description

Technical Field

[0001] The invention relates to a microbubble generating device and a microbubble experimental flotation column used therein, in particular to mineral flotation equipment. Background Art

[0002] With the increasing development of mineral resources, ore resources are showing a trend of becoming "poor, fine, and mixed." Many ores need to be ground to less than 20 microns or even 10 microns before they can be separated into monomers. At the same time, due to the reduction of resources, the comprehensive recycling and utilization of secondary resources, such as new energy lithium batteries and smelting slag, has also received increasing attention. The reuse of these materials also requires their disassembly and grinding to extremely fine particle sizes. When the particle size of minerals or materials is reduced to less than 20 microns, their specific surface area and surface energy increase significantly. Different types of mineral particles are prone to non-selective agglomeration during the flotation process, resulting in further deterioration of their floatability, a sharp decline in flotation recovery and concentrate quality, and a significant increase in flotation reagent consumption.

[0003] The study found that reducing the bubble size can effectively increase the collision probability between bubbles and fine particles. Microbubbles are more likely to be adsorbed on the surface of fine particles whose hydrophobicity has been improved by reagents, and the attachment probability is also steadily improved. At the same time, the turbulence of the slurry in the flotation system also has a great influence on the flotation of fine minerals. Increasing the turbulence of the slurry can improve the flotation recovery of fine minerals, but excessive slurry turbulence will also disturb the mineralized foam layer, which can easily cause entrainment and reduce the quality of the concentrate.

[0004] Existing experimental flotation equipment mainly includes mechanical stirring flotation machine, microporous foaming flotation column, jet flotation column, electrolytic flotation column, etc.

[0005] Among these, mechanical agitator flotation machines use high-speed impellers to agitate and self-aspirate to form mineralized froth for flotation separation. These flotation machines integrate agitation and bubble generation functions. They are characterized by intense slurry agitation, high foam layer disturbance, high air intake, and large bubble size, but are generally ineffective for flotation of fine-grained minerals.

[0006] Microporous foaming flotation columns use microporous tube foaming. As the gas volume increases, the gas passes through the micropores and floats along the surface of the microporous tubes, easily gathering and forming large bubbles. The bubble distribution is uneven, which is a static countercurrent flotation method. The mineral recovery rate is low, and the microporous tubes of this type of flotation column are prone to clogging. Jet flotation columns use a pressure circulation pump to pass the slurry through the Venturi ejector, which self-absorbs and shears it into tiny bubbles, simultaneously achieving mineralization of the slurry. This type of flotation column has a large circulation volume, large slurry agitation, high energy consumption, and severe wear. The above experimental flotation columns have large volumes, require a large amount of ore for a single test, and are labor-intensive to process. The operation is cumbersome and not conducive to conducting mineral processing experiments and research.

[0007] The electrolytic flotation column uses electrode electrolysis to produce gas to generate fine bubbles. The bubble size can reach 10-100 microns. However, in the pulp + reagent system, the electrodes are easily damaged and scaled. The electrolysis process will oxidize and degrade the flotation reagent. The number of bubbles is relatively small and unevenly distributed, and the experimental process is complicated to operate.

[0008] In addition, the existing experimental flotation column adopts a large aspect ratio structure, relying on the self-propelled propulsion of the continuously floating mineralized foam to achieve foam overflow, thereby producing a concentrate product. This method allows the floating mineralized bubbles to overflow the flotation column for too long, increasing the probability of useful minerals being desorbed from the mineralized bubbles, resulting in a low concentrate yield and affected flotation recovery rate. Summary of the Invention

[0009] The technical problem solved by the present invention is: in view of the above problems existing in the existing mineral flotation equipment, a new microbubble generating device and a microbubble experimental flotation column used therein are provided.

[0010] The present invention is implemented by the following technical solutions:

[0011] The microbubble generating device includes a rotary sealing seat 11 and a rotating component 12. The rotary sealing seat 11 is fixedly arranged and provided with an air inlet interface 15. The rotating component 12 is rotatably assembled on the rotary sealing seat 11. The rotating component 12 is provided with a plurality of air outlet micropores 1211. The air outlet micropores 1211 are connected to the air inlet interface 15 on the rotary sealing seat 11 through the air flow channel inside the rotating component and the rotary sealing seat; the rotating component 12 is immersed in the liquid and rotates, and the gas discharged from the air outlet micropores 1211 thereon is formed into microbubbles through relative shear of the liquid.

[0012] In the microbubble generating device of the present invention, further, the rotating component 12 includes an axis component and a rotating body with the axis component as the central axis, an air distribution channel 1212 is provided inside the rotating body, and the air outlet micropores 1211 are arranged in the area corresponding to the air distribution channel on the surface of the rotating body. An air flow channel connected to the air distribution channel inside the rotating body is provided inside the axis component, and the air flow entering from the air inlet interface 15 on the rotary seal seat enters the interior of the rotating body through the air flow channel and is discharged from the air outlet micropores on the surface of the rotating body.

[0013] In the microbubble generating device of the present invention, further, the rotating body is preferably a porous disc, and a plurality of gas distribution channels are arranged inside the porous disc. All gas distribution channels converge into the air flow channel in the docking shaft component at the center of the disc. After the air flow enters from the center of the rotating body, the air flow is quickly and evenly distributed to the various air outlet micropores of the rotating body through multiple gas distribution channels.

[0014] In the microbubble generating device of the present invention, preferably, the rotating body is made of titanium alloy sintered powder, stainless steel sintered powder or porous ceramics, and the pore size of the gas outlet micropores 1211 thereon is 0.1-100 microns, and the porosity is 30-45%.

[0015] In the microbubble generating device of the present invention, preferably, the shaft component extends to the interior of the rotary seal seat 11 for rotational assembly, and is connected to the power component driving the rotating component through the rotary seal seat; the air flow channel inside the shaft component is provided with a docking channel from the side of the shaft component, and an annular sealed cavity is formed between the rotation area of the shaft wall where the docking channel is located and the inner wall of the rotary seal seat by a sealing component, and the air inlet interface 15 is provided at a position corresponding to the annular sealed cavity on the rotary seal seat. The shaft component serves as the power transmission shaft of the rotating component and also as an air flow transmission channel.

[0016] In the microbubble generating device of the present invention, further, a liquid check valve 124 is provided in the air flow channel inside the shaft component. The liquid check valve 124 can ensure the normal passage of air flow while blocking the liquid from entering the rotary seal seat through the air flow channel.

[0017] The present invention also discloses a microbubble experimental flotation column applied to the above-mentioned microbubble generating device, comprising a column 2, a base frame 3, a stirring device, a scraping device and the above-mentioned microbubble generating device; the column 2 is vertically fixed by the base frame 3, the stirring device is installed at the bottom of the column 2, and its stirring blade 43 is arranged at the bottom of the inner cavity of the column 2; the rotating component of the microbubble generating device is installed into the interior of the column 2 from the side and is located above the stirring blade 43; the scraping device is installed at the top of the column 2 to collect the concentrate floated to the top of the column.

[0018] In the microbubble experimental flotation column of the present invention, further, a discharge pipe 21 with a valve is provided at the bottom of the column 2, and a foam tank 23 is provided at the top for collecting and scraping the flotation concentrate by a bubble scraping device, and a concentrate outlet 24 is provided at the bottom of the foam tank 23.

[0019] In the microbubble experimental flotation column of the present invention, further, the stirring device also includes a stirring device coupler 41 and a stirring speed regulating motor 42. The stirring speed regulating motor 42 is fixed on the base frame 3 and is connected to the stirring blade 43 through the stirring device coupler 41, driving the stirring blade to form a turbulent flow from bottom to top in the liquid inside the column.

[0020] In the microbubble experimental flotation column of the present invention, further, the bubble scraping device includes a rotary digging blade 51, a cover plate 52, a bracket 54 and a bubble scraping motor 55. The bracket 54 is detachably fixed to the top of the column 2, and the bubble scraping motor 55 is fixed to the top of the bracket 54. Its motor shaft passes through the bracket and is transmission-connected to the rotary digging blade 51. The cover plate 52 is integrally fixedly connected to the top of the rotary digging blade 51, and a water supply hole is provided on the cover plate 52.

[0021] The above technical solution of the present invention has the following beneficial effects:

[0022] (1) The bubbles generated by the microbubble generator in the liquid are small and adjustable in size, with a large number of bubbles and uniform distribution. The microbubble generator rotates at high speed in the slurry through a porous disc. The airflow discharged from the outlet micropores of the rotating component is sheared by the slurry to form a large number of micron-level small bubbles, which are evenly dispersed throughout the flotation column. By adjusting the speed of the rotating component, the size of the bubbles can be adjusted within a certain range, and the performance characteristics of different minerals and materials with different bubble sizes can be studied for separation.

[0023] (2) The rotating parts of the microbubble generating device rotate at high speed, and the shear stress between them and the slurry is large. At the same time, their own rotation generates a large centrifugal force, which can effectively avoid the blockage of the gas outlet micropores.

[0024] (3) Microbubble Experiment The turbulent flow field of the slurry in the flotation column is adjustable. The stirring device and the microbubble generating device in the flotation column are arranged separately and can be controlled independently. By adjusting the speed of the stirring device, the effect of different slurry turbulence on the flotation recovery of fine-grained minerals and materials can be studied.

[0025] (4) Microbubble experiment The scraping device of the flotation column can enhance the foam overflow. A detachable scraping device is set on the top of the flotation column to scrape out the concentrate product in time and improve the flotation efficiency.

[0026] In summary, the microbubble generating device and its applicable microbubble experimental flotation column provide a microbubble generating device that rotates at high speed within a mineral slurry to produce a large number of micron-sized bubbles. These bubbles are evenly distributed, exhibit good stability, and have easily controlled gas volume. Adjustable bubble size and slurry turbulence facilitate flotation research on fine-grained minerals and materials, providing technical support for the efficient separation of fine-grained minerals and materials. The microbubble experimental flotation column features a compact structure, requires minimal test ore, and is simple to operate, significantly improving the efficiency of mineral flotation tests.

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of the structure of the microbubble generating device of Example 1.

[0029] Figure 2 This is a schematic diagram of the interior of the rotary seal seat in Example 1.

[0030] Figure 3 Schematic diagram of the rotating component in Example 1.

[0031] Figure 4 Schematic diagram of the porous disc in Example 1.

[0032] Figure 5 This is a schematic diagram of the microbubble flotation column structure of Example 2.

[0033] Figure 6 Schematic diagram of the scraping device of Example 2.

[0034] Reference numerals in the figure: 1-microbubble generating device; 11-rotating sealing seat; 111-core shaft; 112-air flow channel; 113-docking channel; 114-rotating sealing ring; 115-bearing; 12-rotating component; 121-porous disc; 1211-air outlet micropores; 1212-gas distribution channel; 122-pressing plate; 123-rotating shaft; 124-liquid check valve; 125-gas distribution hole; 13-connector; 14-speed regulating motor; 15-air inlet interface; 16-support shaft;

[0035] 2-column; 21-ore discharge pipe; 22-ball valve; 23-foam tank; 24-concentrate outlet; 25-flow stabilizer;

[0036] 3-base frame;

[0037] 41- stirring device connector; 42- stirring speed regulating motor; 43- stirring blade;

[0038] 5-bubble scraping device; 51-rotary digging blade; 52-cover plate; 53-water supply hole; 54-bracket; 55-bubble scraping motor. DETAILED DESCRIPTION

[0039] Example 1

[0040] See also Figure 1 The microbubble generating device 1 shown in the figure is a specific embodiment of the present invention, which specifically includes a rotary seal seat 11, a rotating component 12, a connector 13, a speed regulating motor 14 and an air inlet interface 15, wherein the rotary seal seat 11 is fixed relative to the rotating component 12, the air inlet interface 15 is installed on the rotary seal seat 11, connected to an external air source, and provides air for the microbubble generating device. The rotating component 12 is rotatably assembled on the rotary seal seat 11, as shown in FIG. Figure 3As shown in FIG, a plurality of micropores 1211 are provided on the rotating component 12. The micropores 1211 communicate with the air inlet port 15 on the rotating seal seat 11 through air flow channels within the rotating component and the rotating seal seat. When the microbubble generating device of this embodiment is in operation, the rotating component 12 rotates while immersed in the liquid. The air flow supplied by the air inlet port 15 is discharged from the micropores 1211 on the rotating component into the liquid. The gas discharged from the micropores 1211 is sheared relative to the liquid to form microbubbles.

[0041] like Figure 3 As shown, the rotating component 12 includes a shaft component and a rotor, wherein the shaft component is the central axis of the rotating component 12, and the rotor is assembled on the shaft component with the shaft component as the central axis. An air distribution channel 1212 is provided inside the rotor, and the air distribution channel 1212 can be formed by a hollow structure inside the rotor, or a cavity can be processed inside the rotor by mechanical processing means. A plurality of air outlet micropores 1211 are provided on the projection area of the air distribution channel 1212 on the surface of the rotor, so that all air outlet micropores can be connected to the corresponding air distribution channel. Similarly, an air flow channel is also provided on the shaft component, and the air flow channel is a hollow cavity provided in the axial direction of the shaft component. When the shaft component and the rotor are assembled, the air flow channel inside the shaft component is connected with the air distribution channel inside the rotor, and the air flow entering from the air inlet interface on the rotary seal seat enters the interior of the rotor through the air flow channel and is discharged from the air outlet micropores on the surface of the rotor.

[0042] Further Figure 4 As shown, in this embodiment, the rotating body of the rotating component 12 is a porous disc 121, which is fixed by a pressure plate 122. The pressure plate 122 and the shaft component, and the porous disc 121 and the pressure plate 122 are fixedly connected by welding or connecting parts. In this way, the central assembly hole of the porous disc 121 is fixedly assembled with the shaft component through the pressure plate 122, and the porous disc 121 and the pressure plate 122 rotate together with the shaft component. A plurality of air distribution channels 1212 are arranged inside the porous disc 121 and evenly diverge from the center of the disc to the surrounding area. A single air distribution channel is a strip-shaped cavity within the porous disc, one end of which is connected to the central assembly hole of the porous disc and the other end is closed. The air distribution channels are distributed in a vortex shape on the disc. All air distribution channels 1212 converge at the center of the disc to connect the air flow channels inside the shaft component. After the air enters from the center of the rotating body, it is quickly and evenly distributed to the various air outlet micropores of the rotating body through the multiple air distribution channels. The rotating body with the gas distribution channel inside can be formed by sintering titanium alloy powder, stainless steel powder or porous ceramics. The diameter of the gas outlet micropores 1211 is 0.1-100 microns and the porosity is 30-45%.

[0043] In practical applications, multiple groups of porous discs can be set on the shaft component to increase the number of bubbles according to different microbubble application scenarios.

[0044] See also Figure 2 and Figure 3 , the shaft component in this embodiment includes Figure 3 The rotating shaft 123 assembled with the porous disc 121 is a hollow shaft section, and a circle of gas distribution holes 125 are processed inside the shaft position where the porous disc 121 is assembled. The distribution holes 125 connect the internal gas distribution channel 1212 of the assembled porous disc with the internal air flow channel of the rotating shaft 123.

[0045] In this embodiment, the shaft component includes not only the rotating shaft 123 assembled with the rotating body, but also a core shaft 111 extending into the rotating seal seat 11. The core shaft 111 and the rotating shaft 123 can be a long shaft connected in one piece, or two shaft sections fixedly connected by a connector. The core shaft 111 is also provided with an air flow channel 112 connected to the interior of the rotating shaft 123, so that a continuous air flow channel is formed inside the shaft component. At the same time, the rotating component is rotatably assembled with the rotating seal seat 11 through the core shaft 111, and the core shaft 111 passes through the rotating seal seat and is connected to the speed regulating motor 14 through the core shaft 111. The speed regulating motor 14 is the power component that drives the rotating component to rotate. The motor shaft is coaxially locked with the core shaft 111 inside the rotating seal seat 11 through the connector 13 to drive the rotating component to rotate.

[0046] The shaft component serves as the power transmission shaft of the rotating component and also as the airflow transmission channel. Inside the rotary seal seat 11, the core shaft 111 is rotatably assembled in the rotary seal seat 11 through multiple sets of coaxial bearings 115. The airflow channel 112 in the core shaft 111 is provided with a docking channel 113 from the side of the core shaft. The docking channel 113 is located between the two sets of bearings. An air intake annular sealed chamber is formed between the core shaft rotating shaft section where the docking channel 113 is located and the inner wall of the rotary seal seat. Regardless of the angle to which the core shaft 111 rotates, the docking channel 113 and the airflow channel 112 it docks are always connected to the annular sealed chamber. Rotating sealing rings 114 are provided on the inner walls of the bearings on both sides of the annular sealed chamber to ensure the airtightness of the annular sealed chamber during the rotation of the core shaft relative to the rotary seal seat. The air inlet interface 15 is set at the position corresponding to the annular sealing cavity on the rotary seal seat. After the external airflow enters the annular sealing cavity from the air inlet interface 15, it enters the air flow channel 112 in the core shaft and the rotating shaft through the docking channel 113, and is further transmitted to the internal air distribution channel 1212 of the rotating body connected to the air flow channel, and is discharged through the air outlet micropores 1211 on the surface of the rotating body.

[0047] A liquid check valve 124 is provided in the air flow channel inside the rotating shaft 123. The liquid check valve 124 is located at the rear end of the gas distribution holes of all the rotating bodies. The liquid check valve 124 can ensure that the air flow passes normally from one side of the rotating seal seat to the rotating parts, and at the same time prevent the liquid from entering the rotating seal seat in the opposite direction through the air flow channel.

[0048] Example 2

[0049] See also Figure 5 The microbubble experimental flotation column shown in the figure is another specific embodiment of the present invention, which specifically includes a microbubble generating device 1, a column 2, a base frame 3, a stirring device and a scraping device 5, which is used for pulp flotation experiments. Among them, the column 2 is a cylindrical barrel with an opening at the top. The bottom plate of the column 2 is connected to the base frame 3 by screws to keep the column 2 vertically fixed. The stirring device is installed at the bottom of the column 2, and its stirring blades 43 are set at the bottom of the inner cavity of the column 2 to provide flotation power for the slurry inside the column 2. The rotating seal seat 11 of the microbubble generating device 1 is fixedly installed on the outer side of the main body 2, and the bottom is supported and fixed by the support shaft 16. The rotating component of the microbubble generating device 1 is installed into the interior of the column 2 from the side and is located above the stirring blades 43 to provide microbubbles for the slurry during the flotation process. The scraping device 5 is installed on the top of the main body 2 to collect the concentrate floated to the top of the column.

[0050] The bottom plate of the column 2 is provided with a discharge pipe, and the discharge pipe 7 is provided with a ball valve 8 to discharge the tailings after flotation. The upper part of the column 2 is a foam tank 23, which is connected to the overflow of the top of the column 2 to receive the flotation concentrate scraped from the top of the main body 2 by the scraping device 5. The bottom of the foam tank 23 is provided with a concentrate outlet 24 to discharge the collected flotation concentrate.

[0051] For the specific scheme of the microbubble generating device 1, see Example 1. The rotation speed range of the microbubble generating device 1 in this embodiment is 200-1200 rpm, preferably 400-600 rpm; the inlet pressure range of the external air source connected to the air inlet interface 15 is 0.01-0.1 MPa, preferably 0.02-0.05 MPa; the air intake range is 0.1-1.5 L / min, preferably 0.2-0.8 L / min; under these optimized conditions, the microbubbles generated by the rotating component in the columnar slurry are 20-200 microns in size.

[0052] The stirring device includes a stirring device coupler 41, a stirring speed regulating motor 42 and a stirring blade 43. The stirring speed regulating motor 42 is fixed on the base frame 3 and is connected to the stirring blade 43 through the stirring device coupler 41. At the same time, a number of protruding flow stabilizing plates 25 are distributed in the circumferential direction of the inner wall of the column around the lower part of the column 2 for stirring the slurry. The stirring blade 43 rotates to form a turbulent flow of the slurry from bottom to top in the liquid inside the column.

[0053] In this embodiment, the rotation speed of the stirring device ranges from 100 to 1000 r / min, and more preferably ranges from 300 to 600 r / min, which can obtain a better turbulent flow field.

[0054] Specific as Figure 6As shown, the bubble scraping device 5 in this embodiment includes a rotary digging blade 51, a cover plate 52, a bracket 54, and a bubble scraping motor 55. The bracket 54 is detachably fixed to the top of the column 2. The bubble scraping motor 55 is fixed to the top of the bracket 54. Its motor shaft passes through the bracket and is in transmission connection with the rotary digging blade 51. The rotary digging blade 51 is a rotary digging blade structure made of polyurethane material with good elasticity. The cover plate 52 is fixedly connected to the top of the rotary digging blade 51. The bubble scraping motor 55 drives the rotary digging blade 51 and the cover plate 52 to rotate together, scraping the concentrate foam flotated to the surface of the column slurry from the top of the column into the foam tank 23. The cover plate 52 is provided with a water replenishment hole 53 to replenish the column liquid level that drops after the bubble scraping. When adding slurry, the bubble scraping device 5 can be removed from the top of the column by removing the bracket 54. At the same time, the bubble scraping device 5 can be raised and lowered by adding or removing pads between the bracket 54 and the top of the column 2.

[0055] In this embodiment, the rotation speed of the bubble scraping device 5 is in the range of 10-40 r / min, which is adjusted according to the amount of foam of the flotation material.

[0056] After the microbubble experimental flotation column of this embodiment is started, the slurry in the bottom area of the column is stirred and rotated by the stirring blades, hitting the flow stabilizing plate to form an upward flow field. The mineral particles rise a certain distance and then sink, forming a repeated circulation flow field that keeps the mineral particles suspended and dispersed. The pressurized gas generated by the gas source is introduced through the gas interface of the rotating seal seat, flows into the gas distribution channel inside the rotating component through the air flow channel on the shaft component, and the distributed gas flows through the evenly distributed flow channel structure inside the rotating body and overflows from the air outlet micropores on the surface of the porous disk. The speed regulating motor drives the porous disk to rotate at high speed through the shaft component, which violently shears the slurry in the main body to form a large number of fine bubbles. The fine bubbles collide with the mineral particles in the circulating flow field and mineralize, then float to the top of the flotation column to form a mineralized foam layer, which is scraped out by the bubble scraping device. Due to its structure, the flotation column forms a turbulent mineralization zone at the bottom, which enhances the mineralization effect, and forms a relatively static separation zone at the top, which reduces impurities entrained by the foam, ultimately achieving the goal of efficient separation of fine minerals.

[0057] The following is a comparison of pulp flotation effects between the microbubble experimental flotation column of this embodiment and the existing hanging tank experimental flotation machine.

[0058] Comparative Example 1

[0059] The microbubble experimental flotation column in Example 2 of the present invention and the existing hanging tank experimental flotation machine were used to carry out a flotation separation experiment on fine minerals from a lithium mica mine in Yichun, Jiangxi Province. The fineness of the sludge was -400 mesh, accounting for 94%, -600 mesh, accounting for 61%, and the LiO2 content was 0.4-0.56%. The experiment used an amine mixed reagent for flotation separation under weak acid conditions.

[0060] The experimental process of the microbubble flotation column in Example 2 is as follows:

[0061] First, close the ball valve of the discharge pipe; add the pre-adjusted slurry from the top of the flotation column according to its specifications; turn on the bottom stirring device and set the stirring speed of the stirring blade to 400r / min, add flotation reagent, and stir the reaction; turn on the microbubble generating device, set the speed of the speed regulating motor to 500r / min, set the air pressure of the air inlet interface to 0.03mpa and the air intake volume to 0.6L / min; after installing the scraping device, set its speed to 15r / min and turn on the rotary digging blade to scrape the bubbles, and use The receiving plate receives the concentrate product collected by the foam tank from the concentrate outlet; since the foam is scraped away with some water, water needs to be added from the water supply hole on the cover of the scraper device during the flotation process; after the scraping is completed, the scraper device motor is turned off and the scraper device is removed, and the mineral particles on the rotary excavator blades and the remaining concentrate foam in the foam tank are rinsed into the receiving plate with water; the ball valve of the discharge pipe is opened to discharge the slurry into the tailings bucket, and the flotation column is rinsed with clean water until it is clean; the power supply of the microbubble generator, the stirring speed regulating motor, etc. is turned off to complete the experimental operation.

[0062] The flotation separation experiment was carried out on the discarded fine mud of the same source of lepidolite mine using a hanging tank experimental flotation machine. The specific operation can refer to the existing hanging tank experimental flotation machine operation process. The obtained indicators are as follows:

[0063]

[0064] Comparative Example 2

[0065] The microbubble experimental flotation column in Example 2 of the present invention and the existing hanging tank experimental flotation machine were used to carry out flotation separation experiments on the shaking table tailings of a certain sulfide lead-zinc-cassiterite mine in Yunnan. The shaking table tailings contained 0.25-0.35% Sn, but the particle size was extremely fine, with -400 mesh accounting for more than 85% and -600 mesh accounting for 60%. Sodium carbonate and sodium hexametaphosphate were used as adjusting agents, and a mixed agent of benzohydroxamic acid, salicylic hydroxamic acid and tributyl phosphate was used as a collector. The experimental operation process of the two experiments is as shown in Comparative Example 1. The flotation separation indicators are shown in the following table:

[0066]

[0067] By comparing the flotation results of Examples 1 and 2, the microbubble experimental flotation column of the present invention has better concentrate quality and higher recovery rate in the flotation separation of fine-grained lepidolite and cassiterite, indicating that it has higher flotation efficiency for fine-grained minerals. Therefore, the present invention can provide a more suitable flotation experimental equipment for fine-grained minerals and materials.

[0068] The above embodiments are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A microbubble experimental flotation column, comprising a column body (2), a base frame (3), a stirring device, a bubble scraping device and a microbubble generating device, characterized in that: The microbubble generating device comprises a rotary seal seat (11) and a rotary component (12); the rotary seal seat (11) is fixedly arranged and provided with an air inlet interface (15); the rotary component (12) is rotatably assembled on the rotary seal seat (11); the rotary component (12) is provided with a plurality of air outlet micropores (1211); the air outlet micropores (1211) are communicated with the air inlet interface (15) on the rotary seal seat (11) through an air flow channel inside the rotary component and the rotary seal seat; The rotating component (12) is immersed in the liquid and rotates, and the gas discharged from the gas outlet micropores (1211) on the rotating component forms microbubbles through relative shearing of the liquid; The rotating component (12) includes a shaft component and a rotating body with the shaft component as the central axis, an air distribution channel (1212) is provided inside the rotating body, the air outlet micropores (1211) are arranged in an area corresponding to the air distribution channel on the surface of the rotating body, and an air flow channel is provided inside the shaft component and is connected to the air distribution channel inside the rotating body; the air flow entering from the air inlet interface (15) on the rotary seal seat enters the interior of the rotating body through the air flow channel and is discharged from the air outlet micropores on the surface of the rotating body; The rotating body is made of titanium alloy sintered powder, stainless steel sintered powder or porous ceramics, and the pore size of the gas outlet micropores (1211) thereon is 0.1-100 microns, and the porosity is 30-45%; The column (2) is vertically fixed by a base frame (3); the stirring device is installed at the bottom of the column (2); the stirring blade (43) is arranged at the bottom of the inner cavity of the column (2); the rotating component of the microbubble experimental flotation column is installed into the column (2) from the side and is located above the stirring blade (43); the scraping device is installed at the top of the column (2) to collect the flotation concentrate; The bottom of the column (2) is also provided with a discharge pipe (21) with a valve, and the top is provided with a foam tank (23) for collecting and scraping flotation concentrates by a foam scraping device, and the bottom of the foam tank (23) is provided with a concentrate outlet (24); The stirring device further comprises a stirring device coupler (41) and a stirring speed regulating motor (42), wherein the stirring speed regulating motor (42) is fixed on the base frame (3) and is transmission-connected to the stirring blade (43) via the stirring device coupler (41); The bubble scraping device comprises a rotary digging blade (51), a cover plate (52), a bracket (54) and a bubble scraping motor (55), wherein the bracket (54) is detachably fixed to the top of the column (2), the bubble scraping motor (55) is fixed to the top of the bracket (54), and the motor shaft thereof passes through the bracket and is transmission-connected to the rotary digging blade (51), the cover plate (52) is integrally fixedly connected to the top of the rotary digging blade (51), and a water supply hole is provided on the cover plate (52).

2. The microbubble flotation column according to claim 1, wherein the rotating body is a porous disc, and a plurality of gas distribution channels are arranged inside the porous disc, and all the gas distribution channels converge at the center of the disc to connect to the air flow channel in the connecting shaft component.

3. The microbubble flotation column according to claim 1, wherein the shaft component extends to the interior of the rotary seal seat (11) for rotational assembly, and is transmission-connected to a power component that drives the rotary component through the rotary seal seat; The air flow channel inside the shaft component is provided with a docking hole from the side of the shaft component, and an annular sealing cavity is formed between the rotation area of the shaft wall where the docking hole is located and the inner wall of the rotary sealing seat through a sealing component, and the air inlet interface (15) is provided at a position corresponding to the annular sealing cavity on the rotary sealing seat.

4. The microbubble experimental flotation column according to claim 1, wherein a liquid check valve (124) is provided in the air flow channel inside the shaft component.

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