An apparatus and method for improving the efficiency of the flotation of coarse particulate minerals

Abstract

The application discloses a kind of equipment and method for improving the efficiency of coarse-grained mineral flotation, equipment includes stirring assembly, interface micro-nano bubble regulator, coarse particle flotation assembly and vacuum box;Stirring assembly includes stirring barrel, stirring rod arranged in stirring barrel and stirring motor for providing power for stirring rod;Interface micro-nano bubble regulator is connected with stirring barrel;Coarse particle flotation assembly includes coarse particle flotation machine connected with stirring barrel and water supply component connected with coarse particle flotation machine;Vacuum box is sleeved outside coarse particle flotation machine;The equipment structure of the application is reasonable, the interface micro-nano bubble regulator is used to make interface micro-nano bubble produce solid-gas-liquid three-phase micro-nano bubble on the surface of mineral, and the bubble mineralization efficiency is higher, the energy consumption of equipment is reduced, and the flotation effect of coarse-grained mineral is improved.

Description

Technical Field

[0001] This invention relates to the field of mineral processing technology, and specifically to a device and method for improving the flotation efficiency of coarse-grained minerals. Background Technology

[0002] Currently, the effective particle size range for flotation is 10–100 μm. Minerals with a particle size larger than 100 μm are difficult to effectively separate using conventional flotation methods, which is one of the important reasons for the high cost of mineral processing. In recent years, some scholars have used fluidized bed flotation to separate coarse particles, achieving some success; however, many problems still exist, mainly as follows:

[0003] (1) Conventional millimeter-scale flotation bubbles are insufficient to adhere to small hydrophobic sites on the mineral surface. Due to their large particle size, coarse-grained minerals have low monomer liberation, resulting in typically small hydrophobic sites on their surfaces.

[0004] (2) Currently, gas-liquid two-phase bubbles are mostly generated by cavitation and jetting, which consumes a lot of energy, has a high flow rate, and is prone to cavitation damage to equipment, requiring regular replacement on site; interfacial microbubbles generate low energy, have a relatively slow slurry flow rate, and do not exhibit cavitation.

[0005] (3) In addition to the upward force provided by the rising water flow, the buoyancy generated by the bubbles on the particle surface is an important upward force for the particles to float. However, due to the large particle size, nanobubbles cannot provide sufficient buoyancy directly.

[0006] (4) When the interaction between gas-liquid two-phase micro-nano bubbles and minerals is directly used, there is also a collision and adhesion process between micro-nano bubbles and minerals. Compared with the direct generation of solid-gas-liquid three-phase interface micro-nano bubbles, its bubble mineralization efficiency is lower. Summary of the Invention

[0007] To address the aforementioned technical problems, this invention provides an apparatus and method for improving the flotation efficiency of coarse-grained minerals.

[0008] The technical solution of the present invention is as follows: a device for improving the flotation efficiency of coarse-grained minerals, comprising a stirring assembly, an interface micro-nano bubble regulator connected to the stirring assembly, a coarse-grained flotation assembly connected to the stirring assembly, and a vacuum box sleeved outside the coarse-grained flotation assembly; the stirring assembly includes a stirring tank, a stirring rod disposed inside the stirring tank, and a stirring motor that provides power to the stirring rod;

[0009] One end of the interface micro-nano bubble controller is connected to the bottom of the mixing tank via a centrifugal pump, and the other end is connected to the side wall of the mixing tank.

[0010] The coarse particle flotation assembly includes a coarse particle flotation machine connected to the lower end of the side wall of the mixing tank and a water supply component connected to the coarse particle flotation machine.

[0011] A pressure gauge is installed at the top of the vacuum chamber, and a pressure relief valve and an air extraction valve are installed on the side wall; a vacuum pump is installed at the connection between the air extraction valve and the vacuum chamber.

[0012] Furthermore, the interface micro / nano bubble controller includes a throat, a tapering section and a expanding section respectively disposed at both ends of the throat, a feeding section disposed at the end of the tapering section away from the throat, and a discharging section disposed at the end of the expanding section away from the throat; the feeding section is connected to the bottom of the mixing tank via a centrifugal pump; the discharging section is connected to the side wall of the mixing tank.

[0013] Explanation: When the mixture enters the converging section from the feed section, the flow rate gradually increases. When the mixture enters the throat from the expanding section, its flow rate reaches its maximum, the internal pressure decreases, and the dissolved gas in the mixture diffuses under the pressure reduction effect and forms interfacial micro-nano bubbles on the surface of coarse mineral particles.

[0014] Furthermore, a sleeve is fitted around the stirring rod and is rotatably engaged with the top of the mixing tank. A compression section and a spray disc are sequentially arranged at the lower end of the sleeve and fitted around the stirring rod. A compression spiral is fitted inside the compression section and fitted around the stirring rod. A drug delivery tube passes through the mixing tank and is connected to the compression section.

[0015] Explanation: During the rotation of the stirring rod, the compression screw is driven to rotate. The flotation reagents entering the compression section are compressed by the compression screw and sprayed onto the coarse mineral particles through the spray plate. This avoids the flotation reagents being concentrated and affecting their effectiveness, and improves the efficiency of the interaction between the flotation reagents and the minerals.

[0016] Furthermore, the stirring rod is hollow inside, passes through the mixing tank and is rotatably engaged with it. A connecting pulley is fitted on the top of the side wall of the stirring rod, and a main pulley is provided at the output end of the stirring motor. The main pulley and the connecting pulley are driven by a belt. A shaft is rotatably engaged inside the stirring rod, and a connecting plate is provided at the top of the shaft. Several stirring frames are equidistantly distributed in a radiating pattern around the stirring rod, and a movable plate is slidably engaged inside each stirring frame. Each movable plate passes through the stirring rod and is fixedly connected to the shaft. A support frame is provided at the top of the mixing tank, fitted outside the shaft. A follower plate is rotatably engaged on the support frame, and an electric push rod connected to the connecting plate is provided on the follower plate.

[0017] Explanation: The belt drive between the stirring motor and the stirring rod improves the reliability of the equipment. During the rotation of the stirring rod, the shaft rotates, and the movable plates inside the stirring frame mix the coarse mineral particles and flotation reagents. During the rotation of the stirring frame, the electric push rod pushes the connecting plate and the shaft to move on the stirring rod, thereby moving each movable plate inside the corresponding stirring frame, changing the stirring path of the movable plate, and improving the mixing efficiency of coarse mineral particles and flotation reagents.

[0018] Furthermore, a material discharge control assembly is installed inside the mixing tank; the material discharge control assembly includes a uniform material plate installed inside the mixing tank and connected to the ore feeding pipe, a rotating disk rotatably engaged with the top of the uniform material plate, and a rotary motor installed at the top of the mixing tank and providing power to the rotating disk; several material discharge holes are evenly distributed at the bottom of the uniform material plate, several scrapers are evenly distributed at the bottom surface of the rotating disk and abut against the inner wall of the uniform material plate, and a gear groove is provided on the upper end face of the rotating disk; the output shaft of the rotary motor passes through the mixing tank and a drive gear meshing with the gear groove is provided on the output shaft;

[0019] Explanation: A rotary motor drives a drive gear to rotate. Under the action of the drive gear, the rotating disk moves the scraper inside the equalization plate, agitating the coarse mineral particles inside the equalization plate. This causes the coarse mineral particles to intermittently fall into the mixing tank through the discharge hole, preventing the coarse mineral particles from accumulating inside the mixing tank and affecting the uniformity of mixing with the flotation reagents. It also reduces the load on the stirring motor.

[0020] Furthermore, it also includes a concentration assembly connected to the concentrate discharge outlet. The concentration assembly includes a concentration tank connected to the concentrate discharge outlet, a foam collection rack installed inside the concentration tank, and a concentration motor installed at the top of the concentration tank and providing power to the foam collection rack. A conical settling tank is installed at the bottom of the concentration tank, and a first discharge pipe is installed at the bottom of the conical settling tank. A collection trough is fitted inside the upper part of the concentration tank, and a second discharge pipe connected to the collection trough is installed on the side wall of the concentration tank.

[0021] Explanation: Due to the action of flotation reagents, some large-diameter flotation bubbles are mixed in with the coarse mineral particles. At this time, the foam collection rack is rotated by the thickening motor. The flotation bubbles rise along the inner wall of the thickening tank under the action of the foam collection rack and enter the collection tank. The flotation bubbles and overflow water are discharged through the second discharge pipe. The coarse mineral particles are deposited inside the conical settling tank and discharged through the first discharge pipe, which improves the separation effect between coarse mineral particles and flotation bubbles.

[0022] Furthermore, the concentration assembly also includes a jetting component disposed at the top of the concentration tank; the jetting component includes an integrated sleeve disposed at the top of the concentration tank, a mixing pipe sleeved inside the integrated sleeve, several jetting pipes equidistantly distributed on the mixing pipe, and several conical pressure-reducing pipes equidistantly distributed inside the integrated sleeve and corresponding to each jetting pipe; the integrated sleeve is connected to the concentrate discharge port, and a pressure pump is provided at the connection point; a third discharge pipe penetrating the concentration tank is provided on the side wall of the integrated sleeve; and each conical pressure-reducing pipe penetrates the integrated sleeve.

[0023] Explanation: Coarse mineral particles mixed with large-diameter flotation bubbles enter the mixing tube under the action of a pressurized pump, and are sprayed into the corresponding conical pressure-reducing tubes through various jet pipes. When the flotation bubbles and coarse mineral particles enter the conical pressure-reducing tubes, a negative pressure is generated, causing some flotation bubbles to expand and break. Coarse mineral particles mixed with a small amount of flotation bubbles enter the thickening tank through the conical pressure-reducing tubes; while some coarse mineral particles are deposited inside the conical pressure-reducing tubes under the action of gravity and discharged through the three-discharge pipes, further improving the separation effect of coarse mineral particles and large-diameter flotation bubbles and improving defoaming efficiency.

[0024] Furthermore, the water supply components include a water storage tank located outside the coarse particle flotation machine, a turbulence plate located inside the coarse particle flotation machine and connected to the water storage tank via a conduit, and a water pump located at the connection between the turbulence plate and the water storage tank.

[0025] Explanation: By installing turbulence plates inside the coarse particle flotation machine, a stable upward water flow can be generated inside the machine, thereby improving the negative pressure flotation efficiency of coarse minerals.

[0026] The present invention also provides a method for improving the flotation efficiency of coarse-grained minerals, based on the above-mentioned device for improving the flotation efficiency of coarse-grained minerals, comprising the following steps:

[0027] S1. Grind the raw ore to obtain coarse-grained minerals that meet the flotation particle size requirements;

[0028] S2. Pass the coarse mineral particles from step S1 into the stirred tank, and then add the flotation reagent into the stirred tank; use the stirring motor to drive the stirring rod to rotate, and use the stirring rod to stir the coarse mineral particles and flotation reagent evenly to obtain a mixture;

[0029] S3. Using a centrifugal pump, the mixture from step S2 is introduced into the interface micro-nano bubble controller. The mixture enters the mixing tank through the other end of the interface micro-nano bubble controller. The mixture is circulated between the interface micro-nano bubble controller and the mixing tank for 1 to 30 minutes to obtain minerals with different degrees of interface micro-nano bubbles.

[0030] S4. The minerals carrying different degrees of interfacial micro-nano bubbles from step S3 are introduced into the coarse particle flotation machine, and water is added into the coarse particle flotation machine through the water supply component to generate an upward water flow; the air extraction valve is opened, and the vacuum pump is used to evacuate the vacuum chamber to 5-40 kPa. Under the negative pressure, the existing interfacial micro-nano bubbles of the minerals carrying different degrees of interfacial micro-nano bubbles in the coarse particle flotation machine gradually grow, and micro-nano bubbles can continue to be generated at hydrophobic sites. The concentrate carrying micro-nano bubbles is discharged through the top of the coarse particle flotation machine; finally, the pressure relief valve is opened to discharge the tailings from the coarse particle flotation machine; wherein, the flotation particle size range of the coarse particle minerals is 0.1-1.0 mm.

[0031] Compared with the prior art, the beneficial effects of the present invention are reflected in the following aspects:

[0032] First, the device of the present invention utilizes an interface micro-nano bubble regulator to generate solid-gas-liquid three-phase micro-nano bubbles on the mineral surface. Its bubble mineralization efficiency is high, which increases the flow rate of coarse mineral particles inside the interface micro-nano bubble regulator, reduces the energy consumption of the device, and improves the flotation effect of coarse mineral particles. Moreover, the device of the present invention repeatedly regulates the coarse mineral particles inside the interface micro-nano bubble regulator, so that sufficient micro-nano bubbles are generated on the mineral surface, and the bubbles and minerals are fully adhered.

[0033] Secondly, the equipment of the present invention utilizes a vacuum box to provide a negative pressure environment for the coarse particle flotation machine, so that during the flotation process of coarse particles inside the coarse particle flotation machine, the synergistic effect of interfacial micro-nano bubbles and negative pressure provides sufficient buoyancy for the coarse particles, thereby improving the flotation efficiency of coarse particles.

[0034] Third, during the rotation of the stirring rod in this invention, the compression screw causes the flotation reagent to be evenly sprayed onto the surface of the coarse mineral particles through the spraying disc; at the same time, the rotating motor drives the rotating disc to rotate, and the scraper moves the coarse mineral particles inside the equalization disc. The coarse mineral particles intermittently fall into the mixing tank through the discharge hole, which improves the interaction efficiency between the flotation reagent and the coarse mineral particles and lays the foundation for the efficient flotation of coarse mineral particles. Attached Figure Description

[0035] Figure 1 This is a longitudinal sectional view of the device of the present invention;

[0036] Figure 2 This is a schematic diagram of the stirring assembly of the present invention;

[0037] Figure 3 This is a schematic diagram of the stirring frame and stirring rod of the present invention;

[0038] Figure 4 This is a schematic diagram of the structure of the interface micro / nano bubble regulator of the present invention;

[0039] Figure 5 This is a diagram showing the distribution of the material feeding holes inside the material leveling plate of the present invention;

[0040] Figure 6 This is a schematic diagram showing the connection between the rotating disk and the equalizing disk of the present invention;

[0041] Figure 7 This is a schematic diagram of the structure of the concentration component of the present invention;

[0042] Figure 8 A schematic diagram of the jet component of the present invention;

[0043] Among them, 1-stirring assembly, 10-stirring tank, 11-stirring rod, 12-stirring motor, 100-dosage pipe, 101-ore feeding pipe, 13-sleeve, 130-compression section, 131-jetting disc, 132-compression screw, 14-shaft, 140-connecting disc, 141-support frame, 142-follower disc, 143-electric push rod, 144-stabilizing telescopic rod, 15-stirring frame, 150-moving plate, 2-interfacial micro-nano bubble controller, 20-throat, 21-contraction section, 22-expansion section, 23-feeding section, 24-discharge section, 25-centrifugal pump, 3-coarse particle flotation assembly, 30-coarse particle flotation machine, 300-discharge valve, 301-concentrate discharge port, 302-tailings discharge port, 31-water supply. Components, 310-Water storage tank, 311-Turbulence plate, 312-Water pump, 4-Vacuum box, 40-Pressure gauge, 41-Pressure relief valve, 42-Ejection valve, 43-Vacuum pump, 5-Material discharge control assembly, 50-Equalizing plate, 500-Material discharge hole, 51-Rotating disc, 510-Scraper, 511-Gear groove, 52-Rotating motor, 520-Drive gear, 6-Concentration assembly, 60-Concentration tank, 600-Conical settling tank, 601-First discharge pipe, 602-Collection tank, 603-Second discharge pipe, 61-Foam collection rack, 62-Concentration motor, 63-Jet component, 630-Integrated sleeve, 631-Mixing pipe, 632-Jet pipe, 633-Conical pressure reducing pipe, 634-Pressure pump, 635-Third discharge pipe. Detailed Implementation

[0044] Example 1

[0045] like Figure 1 , 2 The device shown is for improving the flotation efficiency of coarse-grained minerals. It includes a stirring assembly 1, an interface micro / nano bubble controller 2 connected to the stirring assembly 1, a coarse-grained flotation assembly 3 connected to the stirring assembly 1, and a vacuum box 4 sleeved outside the coarse-grained flotation assembly 3. The stirring assembly 1 includes a stirring tank 10, a stirring rod 11 disposed inside the stirring tank 10, and a stirring motor 12 disposed at the top of the stirring tank 10 and providing power to the stirring rod 11. A drug delivery tube 100 is disposed at the top of the stirring tank 10, and a mineral addition tube 101 is disposed on the side wall.

[0046] like Figure 1 , 4As shown, the interface micro / nano bubble controller 2 includes a throat 20, a tapered section 21 and a diffusing section 22 respectively disposed at both ends of the throat 20, a feed section 23 disposed at the end of the tapered section 21 away from the throat 20, and a discharge section 24 disposed at the end of the diffusing section 22 away from the throat 20; the feed section 23 is connected to the bottom of the mixing tank 10 through a centrifugal pump 25; the discharge section 24 is connected to the side wall of the mixing tank 10; the diameter of the throat 20 is smaller than the diameter of the feed section 23 and the discharge section 24, the feed section 23 and the discharge section 24 have the same structure, and the tapered section 21 and the diffusing section 22 have the same structure;

[0047] like Figure 1 As shown, the coarse particle flotation assembly 3 includes a coarse particle flotation machine 30 connected to the lower end of the side wall of the mixing tank 10 via a conduit and a water supply component 31 connected to the coarse particle flotation machine 30; a discharge valve 300 is provided at the connection between the coarse particle flotation machine 30 and the mixing tank 10, a concentrate discharge port 301 is provided at the top of the coarse particle flotation machine 30, and a tailings discharge port 302 is provided at the bottom; the water supply component 31 includes a water storage tank 310 provided outside the coarse particle flotation machine 30, a turbulence plate 311 provided inside the coarse particle flotation machine 30 and connected to the water storage tank 310 via a conduit, and a water pump 312 provided at the connection between the turbulence plate 311 and the water storage tank 310.

[0048] like Figure 1 As shown, a pressure gauge 40 is installed at the top of the vacuum chamber 4, and a pressure relief valve 41 and an air extraction valve 42 are installed on the side wall; a vacuum pump 43 is installed at the connection between the air extraction valve 42 and the vacuum chamber 4.

[0049] Example 2

[0050] This embodiment describes a method for improving the flotation efficiency of coarse-grained minerals, based on an apparatus for improving the flotation efficiency of coarse-grained minerals according to Embodiment 1, including the following steps:

[0051] S1. The raw molybdenite ore is ground to obtain coarse-grained molybdenite minerals that meet the flotation particle size requirements;

[0052] S2. The coarse molybdenite particles from step S1 are introduced into the stirred tank 10 through the ore feeding pipe 101. Then, flotation reagents, including a collector and a frother, are added into the stirred tank 10 through the dosing pipe 100. The stirring motor 12 drives the stirring rod 11 to rotate, and the stirring rod 11 is used to stir the coarse mineral particles and flotation reagents evenly to obtain a mixture. The collector is kerosene, with a dosage of 60 g / t; the frother is No. 2 oil, with a dosage of 20 g / t; and the pulp concentration is 30%.

[0053] S3. Using centrifugal pump 25, the mixture from step S2 is sequentially fed through feed section 23 and converging section 21 into throat 20. After passing through throat 20, the mixture sequentially passes through expanding section 22 and discharge section 24 into the mixing tank 10. When the mixture enters converging section 21 from feed section 23, the flow rate gradually increases. When the mixture enters throat 20 from expanding section 22, the flow rate reaches its maximum, and the internal pressure drops. Under the pressure reduction, the dissolved gas in the mixture diffuses and forms interfacial micro-nano bubbles on the surface of coarse mineral particles. The mixture is circulated between interfacial micro-nano bubble controller 2 and mixing tank 10 for 1 minute. Minerals carrying interfacial micro-nano bubbles to varying degrees are observed.

[0054] S4. The minerals carrying different degrees of interfacial micro-nano bubbles from step S3 are introduced into the coarse particle flotation machine 30 through the discharge valve 300. Water from the storage tank 310 is pumped into the coarse particle flotation machine 30 via the turbulence plate 311 using the water pump 312, creating an upward water flow inside the machine. The exhaust valve 43 is opened, and the vacuum pump 43 evacuates the vacuum chamber 4 to 5 kPa. The minerals carrying different degrees of interfacial micro-nano bubbles inside the coarse particle flotation machine 30 operate under negative pressure. Under these conditions, the existing interfacial micro- and nano-bubbles gradually grow, and micro- and nano-bubbles can continue to be generated at hydrophobic sites. The concentrate carrying the micro- and nano-bubbles is discharged through the concentrate discharge port 301 at the top of the coarse particle flotation machine 30. Finally, the pressure relief valve 41 is opened, and the tailings are discharged from the coarse particle flotation machine 30 through the tailings discharge port 302. The coarse particle flotation particle size range is 0.1–0.4 mm. The concentrate grade and recovery rate obtained by the equipment in Example 1 and conventional coarse particle flotation equipment are shown in Table 1.

[0055] Table 1. Concentrate grades and recoveries obtained from the equipment in Example 1 and conventional coarse particle flotation equipment.

[0056]

[0057] Example 3

[0058] The difference between this embodiment and Embodiment 1 is that:

[0059] like Figure 1 , 2As shown in Figure 3, a sleeve 13 is fitted around the stirring rod 11 and rotatably engages with the top of the mixing tank 10. A compression section 130 and a spray disc 131 are sequentially arranged at the lower end of the sleeve 13, both fitted around the stirring rod 11. A compression spiral 132 is fitted inside the compression section 130, also fitted around the stirring rod 11. A drug delivery tube 100 passes through the mixing tank 10 and is connected to the compression section 130. The stirring rod 11 is hollow inside, passes through the mixing tank 10, and rotatably engages with it. A connecting pulley is fitted at the top of the side wall of the stirring rod 11. A main pulley is provided at the output end of the stirring motor 12, and the main pulley and the connecting pulley are driven by a belt. A shaft 14 is rotatably engaged inside the rod 11, and a connecting plate 140 is provided at the top of the shaft 14; several stirring frames 15 are equidistantly distributed in a radiating pattern around the stirring rod 11, and each stirring frame 15 is slidably engaged with a movable plate 150 inside; each movable plate 150 passes through the stirring rod 11 and is fixedly connected to the shaft 14; a support frame 141 is provided at the top of the stirring tank 10 and is sleeved on the outside of the shaft 14, and a follower plate 142 is rotatably engaged on the support frame 141, and an electric push rod 143 connected to the connecting plate 140 is provided on the follower plate 142; a stable telescopic rod 144 connected to the connecting plate 140 is provided on the follower plate 142.

[0060] In this embodiment, the flotation reagent is sprayed onto the coarse mineral particles through the spray disk 131 under the action of the compression screw 132, which can improve the efficiency of the flotation reagent. The movable plate 150, which can move inside the stirring frame 15, is used to stir and mix the coarse mineral particles and the flotation reagent, which is beneficial to improving the mixing efficiency of the coarse mineral particles and the flotation reagent.

[0061] Example 4

[0062] This embodiment describes a method for improving the flotation efficiency of coarse-grained minerals, based on the device for improving the flotation efficiency of coarse-grained minerals in Embodiment 3, which differs from Embodiment 2 in that:

[0063] In step S2, the coarse mineral particles from step S1 are introduced into the mixing tank 10 through the ore feeding pipe 101. Then, the flotation reagents are added into the compression section 130 through the dosing pipe 100 and the sleeve 13. During the rotation of the stirring rod 11, the compression screw 132 is rotated. The flotation reagents entering the compression section 130 are sprayed onto the coarse mineral particles through the spray plate 131 under the compression action of the compression screw 132. During the rotation of the stirring rod 11, the shaft 14 is rotated. The movable plate 150 inside the stirring frame 15 is used to stir and mix the coarse mineral particles and the flotation reagents. During the rotation of the stirring frame 15, the electric push rod 143 pushes the connecting plate 140 and the shaft 14 to move on the stirring rod 11, thereby causing each movable plate 150 to move inside the corresponding stirring frame 15.

[0064] In S3, the mixture is controlled to circulate between the interface micro-nano bubble regulator 2 and the stirring tank 10 for 20 minutes.

[0065] In S4, vacuum pump 43 is used to evacuate the inside of vacuum box 4 to 25 kPa, and the particle size range of coarse mineral flotation is 0.4 to 0.7 mm.

[0066] Example 5

[0067] The difference between this embodiment and Embodiment 3 is that:

[0068] like Figure 1 , 5 As shown in Figure 6, a material discharge control assembly 5 is installed inside the mixing tank 10. The material discharge control assembly 5 includes a uniform material plate 50 installed inside the mixing tank 10 and connected to the ore feeding pipe 101, a rotating disk 51 rotatably clamped to the top of the uniform material plate 50, and a rotary motor 52 installed at the top of the mixing tank 10 and providing power to the rotating disk 51. Several material discharge holes 500 are evenly distributed at the bottom of the uniform material plate 50, and several scrapers 510 are evenly distributed at the bottom surface of the rotating disk 51, which abut against the inner wall of the uniform material plate 50. A gear groove 511 is provided on the upper end surface of the rotating disk 51. The output shaft of the rotary motor 52 passes through the mixing tank 10 and a drive gear 520 that meshes with the gear groove 511 is provided on the output shaft.

[0069] In this embodiment, by controlling the feeding speed of coarse mineral particles, it is possible to avoid the accumulation of coarse mineral particles inside the mixing tank 10, which would affect the uniformity of mixing with the flotation reagent, and at the same time reduce the load on the stirring motor 12.

[0070] Example 6

[0071] This embodiment describes a method for improving the flotation efficiency of coarse-grained minerals, based on the device for improving the flotation efficiency of coarse-grained minerals in Embodiment 5, and differs from Embodiment 4 in that:

[0072] In step S2, the coarse mineral particles from step S1 are fed into the uniform material tray 50 through the ore feeding pipe 101. The rotary motor 52 drives the drive gear 520 to rotate. Under the action of the drive gear 520, the rotary disk 51 drives the scraper 510 to move inside the uniform material tray 50, stirring the coarse mineral particles inside the uniform material tray 50, so that the coarse mineral particles intermittently fall into the mixing tank 10 through the discharge hole 500.

[0073] In step S3, the mixture is controlled to circulate between the interfacial micro / nano bubble regulator 2 and the stirring tank 10 for 30 minutes.

[0074] In S4, vacuum pump 43 is used to evacuate the inside of vacuum box 4 to 40 kPa, and the particle size range of coarse mineral flotation is 0.7 to 1.0 mm.

[0075] Example 7

[0076] The difference between this embodiment and embodiment 5 is that:

[0077] like Figure 1 , 7 As shown in Figure 8, it also includes a concentration assembly 6 connected to the concentrate discharge port 301. The concentration assembly 6 includes a concentration tank 60 connected to the concentrate discharge port 301, a foam collection rack 61 disposed inside the concentration tank 60, and a concentration motor 62 disposed at the top of the concentration tank 60 and providing power to the foam collection rack 61. A conical settling tank 600 is disposed at the bottom of the concentration tank 60, and a first discharge pipe 601 is disposed at the bottom of the conical settling tank 600. A collection trough 602 is sleeved inside the upper part of the concentration tank 60, and a second discharge pipe 603 connected to the collection trough 602 is disposed on the side wall of the concentration tank 60. The concentration assembly 6 also includes a concentration... The jetting component 63 is located at the top of the tank 60. The jetting component 63 includes an integrated sleeve 630 located at the top of the tank 60, a mixing pipe 631 fitted inside the integrated sleeve 630, four jetting pipes 632 equidistantly distributed on the mixing pipe 631, and four conical pressure-reducing pipes 633 equidistantly distributed inside the integrated sleeve 630 and corresponding to each jetting pipe 632. The integrated sleeve 630 is connected to the concentrate discharge port 301, and a pressure pump 634 is provided at the connection. A third discharge pipe 635 penetrating the tank 60 is provided on the side wall of the integrated sleeve 630. Each conical pressure-reducing pipe 633 penetrates the integrated sleeve 630.

[0078] In this embodiment, the concentration component 6 can be used to separate large-diameter flotation foam and liquid water mixed in coarse-grained minerals.

[0079] Example 8

[0080] This embodiment describes a method for improving the flotation efficiency of coarse-grained minerals. Based on the device for improving the flotation efficiency of coarse-grained minerals described in Embodiment 7, the method differs from Embodiment 6 in that it further includes step S5.

[0081] S5. Due to the use of flotation reagents, some large-diameter flotation bubbles are mixed in with the coarse mineral particles. The coarse mineral particles mixed with flotation bubbles are pumped into the mixing pipe 631 by the pressurizing pump 634, and sprayed into the corresponding conical pressure-reducing pipe 633 through each jet pipe 632. When the flotation bubbles and coarse mineral particles enter the conical pressure-reducing pipe 633, a negative pressure is generated, causing some flotation bubbles to expand and break, improving defoaming efficiency. The coarse mineral particles mixed with a small amount of flotation bubbles enter the thickening tank 60 through the conical pressure-reducing pipe 633. Some coarse mineral particles are deposited inside the conical pressure-reducing pipe 633 under the action of gravity and discharged through the three-discharge pipe 635. The thickening motor 62 drives the foam collection rack 61 to rotate. Under the action of the foam collection rack 61, the flotation bubbles rise along the inner wall of the thickening tank 60 and enter the collection tank 602. The flotation bubbles and overflow water are discharged through the second discharge pipe 603. The coarse mineral particles are deposited inside the conical settling tank 600 and discharged through the first discharge pipe 601.

[0082] It should be noted that the stirring motor 12, electric push rod 143, centrifugal pump 25, ore discharge valve 300, water pump 312, pressure gauge 40, pressure relief valve 41, air extraction valve 42, vacuum pump 43, rotary motor 52 and concentration motor 62 used in this invention all adopt existing technologies and are not specifically limited here. Appropriate products can be selected according to actual needs.

Claims

1. A device for improving the flotation efficiency of coarse-grained minerals, characterized in that, The system includes a stirring assembly (1), an interface micro / nano bubble regulator (2) connected to the stirring assembly (1), a coarse particle flotation assembly (3) connected to the stirring assembly (1), and a vacuum box (4) fitted outside the coarse particle flotation assembly (3); the stirring assembly (1) includes a stirring tank (10), a stirring rod (11) disposed inside the stirring tank (10), and a stirring motor (12) that provides power to the stirring rod (11); One end of the interface micro-nano bubble regulator (2) is connected to the bottom of the stirring tank (10) via a centrifugal pump (25), and the other end is connected to the side wall of the stirring tank (10). The coarse particle flotation assembly (3) includes a coarse particle flotation machine (30) connected to the lower end of the side wall of the mixing tank (10) and a water supply component (31) connected to the coarse particle flotation machine (30). The vacuum chamber (4) is equipped with a pressure gauge (40) at the top and a pressure relief valve (41) and an air extraction valve (42) on the side wall; a vacuum pump (43) is installed at the connection between the air extraction valve (42) and the vacuum chamber (4). The stirring rod (11) is hollow inside, passes through the stirring tank (10) and is rotatably engaged with the stirring tank (10). A connecting pulley is sleeved on the top of the side wall of the stirring rod (11). A main pulley is provided at the output end of the stirring motor (12). The main pulley and the connecting pulley are driven by a belt. A shaft (14) is rotatably engaged inside the stirring rod (11). A connecting disc (140) is provided at the top of the shaft (14). Several stirring rods are equidistantly distributed in a radiating pattern around the stirring rod (11). The frame (15) has a movable plate (150) slidably engaged inside each of the stirring frames (15); each of the movable plates (150) passes through the stirring rod (11) and is fixedly connected to the shaft (14); the top of the stirring tank (10) is provided with a support frame (141) sleeved on the outside of the shaft (14), and a follower plate (142) is rotatably engaged on the support frame (141), and an electric push rod (143) connected to the connecting plate (140) is provided on the follower plate (142). The mixing tank (10) is equipped with a material discharge control assembly (5); the material discharge control assembly (5) includes a uniform material plate (50) fitted inside the mixing tank (10) and connected to the ore feeding pipe (101), a rotating disk (51) rotatably clamped to the top of the uniform material plate (50), and a rotary motor (52) provided at the top of the mixing tank (10) and providing power to the rotating disk (51); the bottom of the uniform material plate (50) has several material discharge holes (500) evenly distributed, the bottom surface of the rotating disk (51) has several scrapers (510) evenly distributed and abutting against the inner wall of the uniform material plate (50), and the upper end surface of the rotating disk (51) is provided with a gear groove (511); the output shaft of the rotary motor (52) passes through the mixing tank (10) and the output shaft is provided with a drive gear (520) meshing with the gear groove (511). It also includes a concentration assembly (6) connected to the concentrate discharge port (301). The concentration assembly (6) includes a concentration tank (60) connected to the concentrate discharge port (301), a foam collection rack (61) disposed inside the concentration tank (60), and a concentration motor (62) disposed at the top of the concentration tank (60) and providing power to the foam collection rack (61). A conical settling tank (600) is disposed at the bottom of the concentration tank (60), and a first discharge pipe (601) is disposed at the bottom of the conical settling tank (600). A collection trough (602) is sleeved inside the upper part of the concentration tank (60), and a second discharge pipe (603) connected to the collection trough (602) is disposed on the side wall of the concentration tank (60). The concentration component (6) further includes a jetting component (63) disposed at the top of the concentration tank (60); the jetting component (63) includes an integrated sleeve (630) disposed at the top of the concentration tank (60), a mixing pipe (631) sleeved inside the integrated sleeve (630), several jetting pipes (632) equidistantly distributed on the mixing pipe (631), and several conical pressure-reducing pipes (633) equidistantly distributed inside the integrated sleeve (630) and corresponding one-to-one with each of the jetting pipes (632); the integrated sleeve (630) is connected to the concentrate discharge port (301), and a pressurizing pump (634) is provided at the connection point; a third discharge pipe (635) penetrating the concentration tank (60) is provided on the side wall of the integrated sleeve (630), and each of the conical pressure-reducing pipes (633) penetrates the integrated sleeve (630).

2. The device for improving the flotation efficiency of coarse-grained minerals according to claim 1, characterized in that, The interface micro / nano bubble controller (2) includes a throat (20), a tapered section (21) and a diffusing section (22) respectively disposed at both ends of the throat (20), a feeding section (23) disposed at the end of the tapered section (21) away from the throat (20), and a discharging section (24) disposed at the end of the diffusing section (22) away from the throat (20); the feeding section (23) is connected to the bottom of the mixing tank (10) through a centrifugal pump (25); the discharging section (24) is connected to the side wall of the mixing tank (10).

3. The device for improving the flotation efficiency of coarse-grained minerals according to claim 1, characterized in that, The stirring rod (11) is fitted with a sleeve (13) that is rotatably engaged with the top of the stirring tank (10). The lower end of the sleeve (13) is provided with a compression section (130) and a spray disc (131) fitted outside the stirring rod (11). The compression section (130) is provided with a compression spiral (132) fitted outside the stirring rod (11). The drug delivery tube (100) passes through the stirring tank (10) and is connected to the compression section (130).

4. The device for improving the flotation efficiency of coarse-grained minerals according to claim 1, characterized in that, The water supply component (31) includes a water storage tank (310) located outside the coarse particle flotation machine (30), a turbulence plate (311) located inside the coarse particle flotation machine (30) and connected to the water storage tank (310) via a conduit, and a water pump (312) located at the connection between the turbulence plate (311) and the water storage tank (310).

5. A method for improving the flotation efficiency of coarse-grained minerals, based on the apparatus for improving the flotation efficiency of coarse-grained minerals as described in any one of claims 1-4, characterized in that, Includes the following steps: S1. Grind the raw ore to obtain coarse-grained minerals that meet the flotation particle size requirements; S2. Pass the coarse mineral particles described in step S1 into the inside of the mixing tank (10), and then add the flotation reagent into the inside of the mixing tank (10); use the stirring motor (12) to drive the stirring rod (11) to rotate, and use the stirring rod (11) to stir the coarse mineral particles and flotation reagent evenly to obtain a mixture; S3. Using a centrifugal pump (25), the mixture described in step S2 is introduced into the interface micro-nano bubble regulator (2). The mixture enters the mixing tank (10) through the other end of the interface micro-nano bubble regulator (2). The mixture is controlled to circulate between the interface micro-nano bubble regulator (2) and the mixing tank (10) for 1 to 30 minutes to obtain minerals carrying interface micro-nano bubbles to different degrees. S4. The minerals carrying different degrees of interfacial micro-nano bubbles as described in step S3 are introduced into the coarse particle flotation machine (30), and water is added into the coarse particle flotation machine (30) through the water supply component (31) to generate an upward water flow; the air extraction valve (42) is opened, and the vacuum pump (43) is used to evacuate the vacuum box (4) to 5~40 kPa. Under the negative pressure, the existing interfacial micro-nano bubbles of the minerals carrying different degrees of interfacial micro-nano bubbles in the coarse particle flotation machine (30) gradually grow, and micro-nano bubbles can continue to be generated at the hydrophobic sites. The concentrate carrying micro-nano bubbles is discharged through the top of the coarse particle flotation machine (30); finally, the pressure relief valve (41) is opened to discharge the tailings from the coarse particle flotation machine (30); wherein, the flotation particle size range of the coarse particle minerals is 0.1~1.0 mm.

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