A grade elevator

Abstract

The application discloses a grade improver, relates to the technical field of mineral concentration equipment, and comprises a separation outer cylinder, an outer periodic magnetic attraction device, a water supply and feeding device and a central magnetic ore capturing device; wherein the water supply and feeding device comprises a central cylinder, the inner cavity of the central cylinder comprises a Venturi tube cavity, a slurry discharge port communicated with the Venturi tube cavity is arranged on the central cylinder, and a negative pressure pipe is connected to the throat section of the Venturi tube cavity; the central magnetic ore capturing device comprises an inner magnetic attraction shell, an inner periodic excitation coil, a scraper and a rotary driving device, the inner magnetic attraction shell is provided with a negative pressure port, and the negative pressure pipe is communicated with the negative pressure port. The central magnetic ore capturing device is arranged at the center of the separation outer cylinder, the inner periodic excitation coil can form a magnetic field on the outer wall of the inner magnetic attraction shell, fine-grained magnetite is captured, the scraper pushes the fine-grained magnetite to the negative pressure port, the fine-grained magnetite enters the separation outer cylinder again through the negative pressure pipe, secondary magnetic separation is carried out, the amount of the fine-grained magnetite lost with tailings is reduced, and the recovery rate of useful minerals is improved.

Description

Technical Field

[0001] This invention relates to the field of mineral beneficiation equipment technology, and in particular to a grade enhancement machine. Background Technology

[0002] Magnetic separation is the core method for recovering iron resources from iron ore. With the depletion of high-quality iron ore in China, the requirements for iron concentrate grade in blast furnace smelting have significantly increased. To improve the quality and reduce impurities in iron concentrate, it is necessary to reduce the particle size through fine grinding to achieve liberation of individual particles. However, the separation difficulty of fine-grained minerals, especially magnetite with a particle size of -0.074mm, has increased significantly.

[0003] Grade elevators, also known as magnetic separators or electromagnetic washing machines, are commonly used sorting equipment in the process of upgrading and reducing impurities in iron concentrate. During operation, the magnetic field direction is opposite to the water flow impact direction. Iron concentrate is discharged from the bottom of the grade elevator along the magnetic field direction, while gangue minerals are discharged from the top of the magnetic separator under the impact of the rising water flow, thus improving the concentrate grade. Existing grade elevators only have their magnetic devices located around the outer perimeter of the sorting cylinder, resulting in uneven magnetic field distribution within the cylinder: strong magnetic force at the edges and weak magnetic force in the central area due to "excessive magnetic attenuation." Fine-grained magnetite, due to its light weight and weak individual particle magnetism, easily breaks through the adsorption range at the outer edge of the magnetic field and escapes to the tailings with the rising water flow, leading to low recovery rate of valuable minerals and high magnetic mineral content in the tailings.

[0004] Existing related technologies, such as patent number CN109746117B entitled "Low-frequency AC electromagnetic washing machine" and patent number CN120094739B entitled "A large electromagnetic washing machine", have made improvements in aspects such as the distribution and control of excitation coils, but they have not solved the problem of loss of fine-grained magnetic ore caused by the attenuation of the central magnetic field, and the recovery rate of useful minerals cannot be further improved. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing grade elevators, which suffer from poor collection capacity and low recovery rate of fine-grained magnetite due to excessive attenuation of the magnetic field in the central area of ​​the outer cylinder. This invention provides a grade elevator that can enhance the recovery of fine-grained magnetite by optimizing the magnetic field distribution and material circulation path to achieve efficient collection and secondary separation of fine-grained useful minerals.

[0006] To achieve the above objectives, the present invention provides a grade elevator, including a sorting outer cylinder, an outer periodic magnetic attraction device, a water and material feeding device, and a central magnetic ore capture device.

[0007] The outer cylinder of the sorting unit is equipped with a tailings overflow outlet at the top and a magnetic ore discharge outlet at the bottom.

[0008] The outer period magnetic attraction device is installed around the outer cylinder of the sorting cylinder; the outer period magnetic attraction device forms a stable outer period magnetic field inside the outer cylinder of the sorting cylinder, which can attract magnetic minerals;

[0009] The water feeding device includes a central cylinder located inside the outer separator cylinder. The central cylinder's inner cavity includes a Venturi tube and a vortex water outlet, arranged sequentially from top to bottom and not interconnected. The central cylinder has a slurry outlet connected to the Venturi tube and a vortex water outlet connected to the vortex water outlet. The Venturi tube includes a contraction section, a throat section, and a diffusion section arranged sequentially from top to bottom. The slurry outlet is located below the throat section of the Venturi tube. A negative pressure pipe is connected to the central cylinder at the throat section of the Venturi tube. The Venturi tube utilizes the narrow diameter of the throat section to create negative pressure. The system provides power for the suction and circulation of fine-grained magnetic ore through a negative pressure pipe; the cyclone outlet chamber, in conjunction with the cyclone outlet, can deliver a rotating upward water flow into the outer separator cylinder, enhancing the dissociation effect between the slurry and gangue and reducing the gangue's entrainment of the magnetic ore; the Venturi tube cavity and the cyclone outlet chamber are not connected to avoid interference between the water flow and the slurry crossflow, ensuring that the negative pressure suction and water flow separation functions are independent and stable; the slurry outlet is located below the throat section, specifically below the diffuser section, ensuring that the circulating magnetic ore can accurately enter the lower part of the outer separator cylinder and the inner side of the outer periodic magnetic field, improving the success rate of secondary separation;

[0010] The central magnetic ore capture device includes an inner magnetic housing, an inner periodic excitation coil, a scraper, and a rotary drive device. The inner magnetic housing is fixed around the periphery of the central cylinder and located above the slurry outlet. The inner magnetic housing and the central cylinder together form a sealed mounting cavity, and the inner periodic excitation coil is installed inside the mounting cavity. The inner periodic excitation coil forms an inner periodic magnetic field adapted to fine-grained magnetic ore in the central area of ​​the outer cylinder and above the outer periodic magnetic field, compensating for the attenuation defect of the outer magnetic field at the center. It can efficiently adsorb fine-grained magnetic ore that is not captured by the outer periodic magnetic field and prevent it from escaping with the tailings. The sealed mounting cavity protects the inner periodic excitation coil, isolates it from slurry erosion, and extends the service life of the coil.

[0011] A negative pressure port is provided on the inner magnetic housing and below the inner periodic excitation coil. The negative pressure pipe is connected to the negative pressure port. The scraper is in contact with the outer wall of the inner magnetic housing. The rotary drive device drives the scraper to rotate along the inner magnetic housing to scrape the magnetic ore attracted to the inner magnetic housing to the negative pressure port. Combined with the suction of the negative pressure pipe, the magnetic ore is circulated, which greatly improves the recovery rate of fine-grained magnetic ore.

[0012] In a preferred embodiment, an overflow shell is fixed to the outside of the sorting outer cylinder, and the overflow shell and the sorting outer cylinder form an overflow cavity. The overflow cavity is used to collect tailings overflowing from the upper part of the sorting outer cylinder, and a tailings discharge port is provided at the lower part of the overflow shell.

[0013] In the above technical solution, the overflow chamber can temporarily store the tailings discharged from the tailings overflow port, avoiding direct overflow of tailings and causing pollution around the equipment; the tailings discharge port realizes centralized discharge of tailings, which facilitates the connection of subsequent tailings treatment processes and improves the ease of equipment operation and site cleanliness.

[0014] In a preferred embodiment, the water feeding device further includes a feeding hopper, the central cylinder is fixedly connected to and communicates with the bottom of the feeding hopper, the feeding hopper is provided with a slurry feeding port, and the feeding hopper is fixedly connected to the overflow shell through a support arm.

[0015] In the above technical solution, the feed hopper realizes the centralized input of the slurry to be sorted through the slurry feed port, avoiding slurry spillage, while buffering the slurry flow rate to prevent the slurry from directly impacting the central cylinder and causing excessively high local concentration; the support arm fixes the feed hopper to the overflow shell to ensure stable installation of the feed hopper, reduce the impact of equipment operation vibration on the stability of slurry feeding, and ensure continuous and uniform sorting process.

[0016] In a preferred embodiment, a fan-shaped baffle is fixed inside the feed hopper, and the fan-shaped baffle is located above the slurry feed port.

[0017] In the above technical solution, the fan-shaped baffle can buffer the impact force of the slurry falling from the slurry feed port, and avoid the slurry directly impacting the feed hopper or the inner wall of the central cylinder, which would cause wear; at the same time, it can evenly disperse the slurry into the central cylinder, prevent the slurry from accumulating locally in the central cylinder, and ensure the uniformity of subsequent negative pressure suction and water flow separation.

[0018] In a preferred embodiment, the water supply device further includes a vortex water supply cylinder, one end of which extends into the central cylinder and communicates with the vortex water outlet chamber; the vortex water outlets are circumferentially distributed on the central cylinder, and a vortex water outlet pipe communicating with the vortex water outlets is installed on the central cylinder.

[0019] In the above technical solution, the vortex water supply cylinder provides a stable high-pressure water source for the vortex outlet chamber, while also separating the vortex outlet chamber from the Venturi tube chamber; the setting of the vortex outlet pipe facilitates the formation of vortex water, enhances the dissociation effect between the slurry and gangue, and improves the separation accuracy.

[0020] In a preferred embodiment, the inner cavity of the central cylinder further includes a direct water supply cavity located below the vortex water outlet cavity and not connected to the vortex water outlet cavity, and a direct water inlet connected to the direct water supply cavity is provided on the central cylinder; the water supply and feeding device further includes a direct water supply cylinder, one end of which extends into the vortex water supply cylinder and is connected to the direct water supply cavity.

[0021] In the above technical solution, the DC water supply chamber and the DC water supply cylinder work together to deliver a low-pressure DC rising water flow to the lower part of the outer separator cylinder, which can drive the slurry to move upward, facilitating magnetic separation. The DC water supply chamber and the cyclone outlet chamber are not connected to prevent the two water flows from interfering with each other, forming a composite water flow field of lower DC lifting and upper rotational dissociation, thus optimizing the separation environment.

[0022] In a preferred embodiment, the central magnetic ore capturing device further includes a rotating component, an external gear ring, and a gear. The rotating component is coaxially rotatably connected to the central cylinder. The external gear is fixedly mounted on the rotating component. The gear is fixedly mounted on the output end of the rotary drive device. The gear meshes with the external gear ring. The scraper is fixedly connected to the rotating component. Both the gear and the external gear ring are located above the sorting outer cylinder.

[0023] In the above technical solution, the gear and external gear ring meshing transmission structure provides stable transmission, ensuring that the rotating parts drive the scraper to rotate at a uniform speed, avoiding scraper jamming that leads to magnetic ore accumulation, and improving the scraping efficiency of fine-grained magnetic ore; the gear and external gear ring are located above the outer cylinder of the sorting cylinder, away from the slurry area, reducing slurry erosion and wear, while facilitating equipment maintenance and repair, and reducing maintenance costs.

[0024] In a preferred embodiment, the scraper is spiral-shaped, with its lower end below the negative pressure port.

[0025] In the above technical solution, the spiral scraper can gradually push the magnetic ore on the outer wall of the inner magnetic shell towards the negative pressure port during turnover, avoiding the local accumulation of magnetic ore in the shell and realizing continuous scraping and feeding of magnetic ore; the lower end of the scraper is lower than the negative pressure port, which can ensure that fine-grained magnetic ore can be scraped and fed to the negative pressure port without any dead corners in the recovery, further improving the recovery rate of fine-grained magnetic ore.

[0026] In a preferred embodiment, the external periodic magnetic attraction device includes an external magnetic attraction housing and an external periodic excitation coil. A fixed platform is fixed on the outer sorting cylinder, the external magnetic attraction housing is fixed on the fixed platform, and the external periodic excitation coil is disposed between the external magnetic attraction housing and the outer sorting cylinder.

[0027] In the above technical solution, the outer magnetic housing can protect the coil from external collisions and dust corrosion; the fixed platform ensures that the outer magnetic housing and the outer periodic excitation coil are firmly installed, ensuring stable sorting effect in the peripheral area.

[0028] In a preferred embodiment, a magnetic shielding plate is fixed inside the mounting cavity. The magnetic shielding plate and the inner magnetic housing together form a magnetic shielding cavity. An inner periodic excitation coil is located inside the magnetic shielding cavity, and a negative pressure tube is located below the magnetic shielding cavity.

[0029] In the above technical solution, the magnetic shielding plate can reduce the impact of the inner periodic excitation coil on the slurry transported in the central cylinder, avoid the blockage of the central cylinder caused by magnetic attraction of magnetic minerals in the slurry, and at the same time avoid magnetic attraction of magnetic minerals in the negative pressure pipe.

[0030] The beneficial effects of this technical solution are:

[0031] 1. By setting a central magnetic ore capture device at the center of the outer cylinder of the sorting, the inner periodic excitation coil can form a stable gradient magnetic field on the outer wall of the inner magnetic shell, effectively capturing fine-grained magnetite that escapes due to the attenuation of the central magnetic field.

[0032] 2. The scraper can gradually aggregate the fine-grained magnetic ore adsorbed on the outer wall of the inner magnetic shell into large-diameter magnetic particle flocs, and push them to the negative pressure port. The negative pressure of the throat section of the Venturi tube acts on the negative pressure port through the negative pressure pipe, drawing the magnetic particle flocs into the Venturi tube. They then re-enter the lower part of the outer separator cylinder and the inner side of the outer periodic magnetic adsorption device from the slurry outlet for secondary magnetic separation, reducing the amount of fine-grained magnetic ore lost with the tailings and improving the recovery rate of useful minerals. Attached Figure Description

[0033] Figure 1 A perspective view of the grade-lifting machine provided in the embodiments of this application;

[0034] Figure 2 An exploded view of the grade booster provided in the embodiments of this application;

[0035] Figure 3 A front view of the grade-lifting machine provided in an embodiment of this application;

[0036] Figure 4 A left view of the grade-lifting machine provided in an embodiment of this application;

[0037] Figure 5 for Figure 3 A sectional view along line AA.

[0038] Figure 6 for Figure 5 A magnified view of a section at point B in the middle;

[0039] Figure 7 for Figure 5 A magnified view of a section at point C;

[0040] Figure 8 for Figure 5 A magnified view of a section at point D;

[0041] Figure 9 This is a partial schematic diagram of the central magnetic ore capturing device provided in the embodiments of this application;

[0042] In the diagram, 100 is the outer sorting cylinder; 110 is the tailings overflow outlet; 120 is the magnetic ore discharge outlet; 130 is the fixed platform; and 140 is the cone section.

[0043] 200. External periodic magnetic attraction device; 210. External magnetic attraction housing; 220. External periodic excitation coil;

[0044] 300. Water and feed device; 310. Central cylinder; 311. Venturi tube; 3111. Contraction section; 3112. Throat section; 3113. Diffusion section; 312. Swirl water outlet; 313. Slurry outlet; 314. Swirl water outlet; 315. Direct water supply chamber; 316. Direct water supply outlet; 320. Negative pressure pipe; 330. Feed hopper; 331. Slurry feed inlet; 340. Support arm; 350. Fan-shaped baffle; 360. Swirl water supply cylinder; 370. Swirl water outlet pipe; 380. Direct water supply cylinder;

[0045] 400. Central magnetic ore capture device; 410. Inner magnetic suction housing; 411. Negative pressure port; 412. Mounting cavity; 420. Inner periodic excitation coil; 430. Scraper; 440. Rotary drive device; 450. Rotating component; 460. Outer gear ring; 470. Gear; 480. Magnetic shielding plate; 481. Magnetic shielding cavity;

[0046] 500, Overflow shell; 510, Overflow cavity; 520, Tailings discharge port;

[0047] 600. Valves. Detailed Implementation

[0048] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0049] Please see Figures 1 to 9 This application provides a grade elevator, including a sorting outer cylinder 100, an outer periodic magnetic attraction device 200, a water and material feeding device 300, and a central magnetic ore capture device 400.

[0050] The outer sorting cylinder 100 is a vertical cylindrical structure. Its top is equipped with a tailings overflow port 110 for discharging gangue minerals, and its bottom is equipped with a magnetic ore discharge port 120 for discharging purified iron concentrate. A valve 600 is installed at the magnetic ore discharge port 120 to control the discharge of magnetic ore.

[0051] An overflow shell 500 is fixed to the outside of the outer cylinder 100. An overflow cavity 510 is formed between the overflow shell 500 and the outer cylinder 100. The overflow cavity 510 is used to collect the tailings overflowing from the tailings overflow port 110. A tailings discharge port 520 is provided at the bottom of the overflow shell 500 to facilitate the centralized discharge of tailings.

[0052] An outer periodic magnetic attraction device 200 is installed around the outer sorting cylinder 100 to collect magnetic ore in the edge area of ​​the outer sorting cylinder 100. It includes an outer magnetic attraction shell 210 and an outer periodic excitation coil 220. An annular fixed platform 130 is fixed on the outer wall of the outer sorting cylinder 100. The outer magnetic attraction shell 210 is fixed to the fixed platform 130 by bolts. The outer periodic excitation coil 220 is embedded in the gap between the outer magnetic attraction shell 210 and the outer sorting cylinder 100. It generates a magnetic field through periodic excitation to achieve the adsorption and separation of magnetic ore in the edge area.

[0053] It should be noted that multiple sets of external periodic excitation coils 220 are arranged at intervals from top to bottom, totaling 9 sets. The external periodic excitation coils 220 are connected to an external electrical control cabinet via wires. The control cabinet can precisely control the magnetic field strength of each set of external periodic excitation coils 220 by adjusting the current input to the external periodic excitation coils 220, thus adapting to the separation requirements of slurries with different particle sizes.

[0054] During operation, each external periodic excitation coil 220 periodically generates a magnetic field according to a set time and a continuously cyclical sequence from top to bottom. With this setting, when the magnetic field changes, it can work with the scraper 430 to make the fine concentrate move downward under the action of magnetic force, preventing difficulties in unloading the ore when the magnetic field changes.

[0055] In this embodiment, please refer to Figure 1 , Figure 2 , Figure 5 The water supply and feeding device 300 includes a central cylinder 310, a feeding hopper 330, a vortex water supply cylinder 360, and a direct current water supply cylinder 380.

[0056] The central cylinder 310 is coaxially arranged inside the outer sorting cylinder 100, and its inner cavity is divided into a non-connected Venturi tube cavity 311, a vortex water outlet cavity 312, and a direct flow water supply cavity 315 from top to bottom.

[0057] Please see Figure 7 The Venturi tube 311 follows the Venturi tube principle, consisting of a contraction section 3111, a throat section 3112, and a diffuser section 3113 from top to bottom. The inner diameter of the throat section 3112 is the smallest, and the inner diameter gradually decreases from the contraction section 3111 to the throat section 3112, while the inner diameter gradually increases from the throat section 3112 to the diffuser section 3113. Based on the Venturi tube principle, a negative pressure can be formed at the throat section 3112. The central cylinder 310 has a slurry outlet 313 on its side wall that communicates with the Venturi tube 311. The slurry outlet 313 is located below the throat section 3112, and a negative pressure pipe 320 is welded at the throat section 3112.

[0058] Please see Figure 8The swirling water outlet 314 is evenly distributed in a circle on the side wall of the swirling water outlet cavity 312. The swirling water outlet 314 is configured in three layers. A swirling water outlet pipe 370 connected to the swirling water outlet 314 is installed on the outside of the central cylinder 310 to deliver rotating and rising water flow into the outer separation cylinder 100. The rotating water flow can enhance the separation effect of slurry and magnetic ore.

[0059] Please see Figure 8 The direct current water supply chamber 315 is not connected to the vortex outlet chamber 312. A direct current water supply port 316, connected to the direct current water supply chamber 315, is provided on the central cylinder 310. One end of the direct current water supply cylinder 380 extends into the vortex water supply cylinder 360 and connects to the direct current water supply chamber 315. The direct current water supply cylinder 380 is connected to a low-pressure water source to supply a direct current upward flow to the direct current water supply chamber 315. The direct current water flow is discharged from the direct current water supply port 316. The direct current water flow can maintain a stable upward flow velocity, preventing gangue minerals from accumulating.

[0060] Please see Figure 1 The feed hopper 330 is fixed at the top of the central cylinder 310 and communicates with the inner cavity of the central cylinder 310. Its top is provided with a slurry feed port 331 for inputting the slurry to be sorted. The feed hopper 330 is fixedly connected to the overflow shell 500 through symmetrically arranged support arms 340 to ensure the overall structural stability.

[0061] One end of the vortex water supply cylinder 360 extends into the central cylinder 310 and is sealed and connected to the vortex water outlet chamber 312, while the other end is connected to a high-pressure water source for supplying high-pressure water to the vortex water outlet chamber 312.

[0062] In this embodiment, please refer to Figure 2 , Figure 5 , Figure 6 and Figure 7 The central magnetic ore capturing device 400 is used to capture fine-grained magnetic ore in the central area of ​​the outer cylinder 100. It includes an inner magnetic shell 410, an inner periodic excitation coil 420, a magnetic shielding plate 480, a scraper 430, a rotary drive device 440, a rotating component 450, an outer gear ring 460, and a gear 470.

[0063] The inner magnetic housing 410 is an annular structure, coaxially fixed around the central cylinder 310 and located above the slurry outlet 313. The inner magnetic housing 410 and the central cylinder 310 form a sealed mounting cavity 412. The inner periodic excitation coil 420 is set in the mounting cavity 412. Multiple sets of the inner periodic excitation coil 420 are arranged at intervals from top to bottom, for a total of 8 sets. The inner periodic excitation coil 420 is connected to an external electrical control cabinet through wires. The control cabinet can precisely control the magnetic field strength of each set of inner periodic excitation coil 420 by adjusting the current input to the inner periodic excitation coil 420.

[0064] A circumferentially distributed negative pressure port 411 is provided on the side wall of the inner magnetic housing 410 and below the inner periodic excitation coil 420. The negative pressure port 411 corresponds to the negative pressure tube 320 one by one. In this embodiment, there are four of both. The end of the negative pressure tube 320 away from the central cylinder 310 is sealed and connected to the negative pressure port 411.

[0065] The rotating component 450 is a rotating body structure, and is coaxially connected to the central cylinder 310 through a bearing; the outer gear ring 460 is fixedly fitted on the outside of the rotating component 450; the rotating drive device 440 adopts a geared motor, and the rotating drive device 440 is fixed on the overflow shell 500. A gear 470 is fixedly installed at its output end, and the gear 470 meshes with the outer gear ring 460 for transmission.

[0066] The scraper 430 is spiral-shaped and is evenly fixed at the lower end of the rotating part 450 along the circumference of the rotating part 450. In this embodiment, four scrapers 430 are provided. The end of the scraper 430 away from the rotating part 450 is in close contact with the outer wall of the inner magnetic housing 410. The lower end of the scraper 430 is lower than the negative pressure port 411, ensuring that it can scrape the magnetic ore on the outer wall of the inner magnetic housing 410 to the negative pressure port 411.

[0067] It should be noted that magnetic separation is a physical separation technique that utilizes the magnetic differences between minerals to separate valuable minerals from gangue minerals under the influence of a magnetic field. In iron ore, valuable minerals such as magnetite and maghematite are strongly magnetic and can be adsorbed by a magnetic field; gangue minerals such as quartz, feldspar, and silicates are weakly magnetic or non-magnetic and are almost unaffected by magnetic forces in a magnetic field. This magnetic difference is a prerequisite for magnetic separation and is also the design basis for the "coordinated separation by internal and external dual magnetic fields" in this embodiment.

[0068] In this embodiment, the slurry to be sorted is fed into the feed hopper 330 through the slurry feed port 331. The slurry to be sorted is an iron concentrate with a content of 85%, a grade of 55%, and a particle size of -0.074mm. At the same time, the outer periodic excitation coil 220, the inner periodic excitation coil 420, and the rotary drive device 440 are activated. The outer periodic magnetic attraction device 200 forms a gradient magnetic field inside the outer cylinder 100, and the inner periodic excitation coil 420 forms a gradient magnetic field on the outer wall of the inner magnetic attraction shell 410. The rotary drive device 440 drives the rotating part 450 and the scraper 430 to rotate through the gear 470 and the outer gear ring 460. The scraper 430 rotates at a speed of 5r / min.

[0069] High-pressure water at a pressure of 0.3 MPa is supplied to the vortex outlet chamber 312 through the vortex water supply cylinder 360. The high-pressure water forms a rotating upward water flow through the vortex outlet 314 and the vortex outlet pipe 370. Low-pressure water at a pressure of 0.1 MPa is supplied to the direct water supply chamber 315 through the direct water supply cylinder 380. The low-pressure water is discharged from the direct water supply port 316, forming a direct upward water flow. The two water flows mix in the outer sorting cylinder 100 to form a stable upward water flow field.

[0070] The slurry enters the Venturi tube 311 of the central cylinder 310 through the feed hopper 330, and a negative pressure is formed at the throat section 3112, which is transmitted to the negative pressure port 411 through the negative pressure pipe 320.

[0071] The slurry enters the lower part of the outer separator cylinder 100 from the slurry outlet 313. The coarse-grained, strongly magnetic ore is attracted to the inner wall of the outer separator cylinder 100 by a strong magnetic field with an intensity of 0.1-0.8T. Overcoming the impact of water flow and gravity, it circulates with the external magnetic field, undergoing an "adsorption-demagnetization-sliding" process, and finally falls into the conical section 140 at the bottom of the outer separator cylinder 100. After opening valve 600, it is discharged from the magnetic ore outlet 120. A demagnetizing device can be connected to the bottom of valve 600 to demagnetize the discharged magnetic ore.

[0072] Fine-grained strong magnetic ores, due to their small particle size, light weight, and weak individual particle magnetism, are not subjected to sufficient magnetic force to resist the impact of rising water flow at the edge of the outer periodic magnetic field. They easily break through the adsorption range of the outer periodic magnetic field and move towards the central area of ​​the outer sorting cylinder 100. The inner periodic magnetic field, with a strength of 0.05-0.4T, is suitable for the adsorption requirements of fine-grained magnetic ores. Through periodic excitation by the inner periodic excitation coil 420, a stable gradient magnetic field is formed on the outer wall of the inner magnetic shell 410, allowing the fine-grained strong magnetic ores to enter the... After entering the magnetic field region, the particles are attracted to the outer wall of the inner magnetic shell 410 by the magnetic force, preventing them from escaping to the tailings overflow outlet 110 with the rising water flow. Simultaneously, with the periodic excitation cycle of the inner periodic magnetic field "from bottom to top," the adsorbed fine-grained magnetic ore, when freed from the magnetic force constraint, is scraped and aggregated by the scraper 430 to form magnetic particle flocs, which are then pushed to the negative pressure port 411. Finally, through the negative pressure port 411, they are drawn into the Venturi tube 311 by the negative pressure pipe 320 and discharged from the slurry outlet for further separation. The inner diameter of the negative pressure pipe 320 is set to 20mm, much larger than the particle size of the magnetic particle flocs, which generally do not exceed 1mm, preventing blockage within the negative pressure pipe 320.

[0073] Because the fine-grained magnetic ore from the second separation has been scraped and agglomerated by the scraper 430 into larger, more concentrated magnetic particle flocs, these are more easily attracted by the magnetic field than the dispersed fine particles. Upon entering the outer sorting cylinder 100, the original magnetic particle flocs may or may not be dispersed. Undispersed magnetic particle flocs are easily captured by the external periodic magnetic field and, under the periodic excitation of the external periodic magnetic field, eventually fall into the conical section 140 at the bottom of the outer sorting cylinder 100, and are discharged from the magnetic ore outlet 120 after the valve 600 is opened. The dispersed magnetic particle flocs will move back towards the central area of ​​the outer sorting cylinder 100, be recaptured by the internal periodic magnetic field, agglomerate into flocs, and enter the next cycle, ensuring no loss.

[0074] By selectively capturing fine-grained magnetite in the central region of the outer separator 100 and subjecting it to multiple cyclic separations, the loss of fine-grained magnetite is reduced, the recovery rate is increased, and resource utilization and separation efficiency are significantly improved.

[0075] Gangue minerals are not subject to or are only subject to weak magnetic field forces throughout the process. Under the continuous upward movement of the rotating water flow formed by the rotating water flow and the direct water flow, they eventually enter the overflow chamber 510 from the tailings overflow outlet 110 and are discharged from the tailings discharge outlet 520.

[0076] In some embodiments, please refer to Figure 1 A fan-shaped baffle 350 can also be welded and fixed inside the feed hopper 330. Please refer to [link / reference]. Figure 5 The fan-shaped baffle 350 is located above the slurry feed port 331, which can prevent slurry from splashing after impacting the inner wall of the central cylinder 310.

[0077] In some embodiments, please refer to Figure 6 and Figure 7 A magnetic shielding plate 480 can also be welded and fixed inside the mounting cavity 412. The magnetic shielding plate 480 and the inner magnetic housing 410 together form a magnetic shielding cavity 481. The inner periodic excitation coil 420 is located inside the magnetic shielding cavity 481, and the negative pressure pipe 320 is located below the magnetic shielding cavity 481. The magnetic shielding plate 480 is made of manganese steel with a thickness of 10mm, which can reduce the impact of the inner periodic excitation coil 420 on the slurry transported inside the central cylinder 310.

[0078] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0079] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

[0080] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0081] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0082] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

Claims

1. A quality enhancement machine, characterized in that, include: The outer cylinder of the sorting system is equipped with a tailings overflow outlet at the top and a magnetic ore discharge outlet at the bottom. The outer periodic magnetic attraction device is fitted around the outer perimeter of the sorting outer cylinder; The water feeding device includes a central cylinder located inside the outer cylinder of the sorting system. The inner cavity of the central cylinder includes a Venturi tube cavity and a vortex water outlet cavity arranged sequentially from top to bottom and not connected. The central cylinder is provided with a slurry outlet cavity connected to the Venturi tube cavity and a vortex water outlet cavity connected to the vortex water outlet cavity. A negative pressure pipe is connected to the throat section of the central cylinder located in the Venturi tube cavity. The central magnetic ore capture device includes an inner magnetic housing, an inner periodic excitation coil, a scraper, and a rotary drive device. The inner magnetic housing is fixed around the periphery of the central cylinder and located above the slurry outlet. The inner periodic excitation coil is installed inside the inner magnetic housing. A negative pressure port is opened on the inner magnetic housing and below the inner periodic excitation coil. The negative pressure pipe is connected to the negative pressure port. The scraper is in contact with the outer wall of the inner magnetic housing. The rotary drive device drives the scraper to rotate around the inner magnetic housing to scrape the magnetic ore attracted to the inner magnetic housing to the negative pressure port.

2. The grade enhancement machine according to claim 1, characterized in that, An overflow shell is fixed to the outside of the sorting outer cylinder, and the overflow shell and the sorting outer cylinder form an overflow cavity. The overflow cavity is used to collect the tailings overflowing from the upper part of the sorting outer cylinder, and a tailings discharge port is provided at the lower part of the overflow shell.

3. The grade enhancement machine according to claim 2, characterized in that, The water supply and feeding device also includes a feeding hopper, with the central cylinder fixedly connected to and communicating with the bottom of the feeding hopper. The feeding hopper is provided with a slurry feeding port, and the feeding hopper is fixedly connected to the overflow shell through a support arm.

4. The grade enhancement machine according to claim 3, characterized in that, A fan-shaped baffle is fixed inside the feed hopper, and the fan-shaped baffle is located above the slurry feed port.

5. The grade enhancement machine according to claim 3, characterized in that, The water supply device also includes a vortex water supply cylinder, one end of which extends into the central cylinder and is connected to the vortex water outlet chamber; the vortex water outlets are distributed circumferentially on the central cylinder, and a vortex water outlet pipe connected to the vortex water outlets is installed on the central cylinder.

6. The grade-lifting machine according to claim 5, characterized in that, The inner cavity of the central cylinder also includes a direct water supply cavity located below the vortex water outlet cavity and not connected to the vortex water outlet cavity. The central cylinder is provided with a direct water inlet connected to the direct water supply cavity. The water supply and feeding device also includes a direct water supply cylinder, one end of which extends into the vortex water supply cylinder and is connected to the direct water supply cavity.

7. The grade-lifting machine according to claim 1, characterized in that, The central magnetic ore capturing device also includes a rotating component, an outer gear ring, and a gear. The rotating component is rotatably connected to the central cylinder on the same axis. The outer gear is fixedly installed on the rotating component. The gear is fixedly installed at the output end of the rotary drive device. The gear meshes with the outer gear ring. The scraper is fixedly connected to the rotating component. Both the gear and the outer gear ring are located above the outer sorting cylinder.

8. The grade-lifting machine according to claim 7, characterized in that, The scraper is spiral-shaped, with its lower end below the negative pressure port.

9. The grade enhancement machine according to claim 1, characterized in that, The external periodic magnetic attraction device includes an external magnetic attraction shell and an external periodic excitation coil. A fixed platform is fixed on the outer sorting cylinder, the external magnetic attraction shell is fixed on the fixed platform, and the external periodic excitation coil is arranged between the external magnetic attraction shell and the outer sorting cylinder.

10. The grade-lifting machine according to claim 1, characterized in that, The inner magnetic housing and the central cylinder together form a sealed mounting cavity. A magnetic shielding plate is fixed inside the mounting cavity. The magnetic shielding plate and the inner magnetic housing together form a magnetic shielding cavity. The inner periodic excitation coil is located inside the magnetic shielding cavity, and the negative pressure tube is located below the magnetic shielding cavity.

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