A system for recovering tungsten from polymetallic tailings

Abstract

The present invention relates to mineral processing technology, specifically a system for recovering tungsten from polymetallic tailings. This process, which involves magnetic separation followed by flotation, can address the corrosion issues associated with magnetic separation equipment in conventional flotation-followed magnetic separation processes. Magnetic separation is used to produce coarse wolframite ore and demagnetized tailings. The coarse wolframite ore is then subjected to flotation to produce wolframite concentrate. The demagnetized tailings are then acid-washed, blended, and flotated to produce scheelite-fluorite concentrate. The scheelite-fluorite concentrate is then subjected to centrifugal gravity separation to produce scheelite concentrate, thereby improving the grade and recovery rate of the scheelite concentrate.

Description

Technical Field

[0001] The present invention belongs to mineral processing technology, in particular to a system for recovering tungsten from polymetallic tailings. Background Art

[0002] Tungsten is one of the irreplaceable basic materials for the national economy and modern national defense. It is an important strategic material and is widely used in important fields such as aerospace, machinery manufacturing, and defense industry. Therefore, the country attaches great importance to the development and utilization of tungsten resources.

[0003] Wolframite and scheelite are difficult-to-process ores, often accompanied by calcium-rich fluorite and calcite, and calcium- and magnesium-rich tremolite. These gangues have similar surface properties to scheelite, necessitating the addition of large amounts of inhibitors. Common inhibitors include water glass, sodium hexametaphosphate, sodium fluorosilicate, and carboxymethyl cellulose. In the mixed flotation of wolframite and scheelite, the addition of lead nitrate helps enhance the chelating agent's ability to capture scheelite and wolframite, reducing collector dosage. Collectors typically used in mixed flotation of wolframite and scheelite include fatty acid collectors or a combination of chelate and fatty acid collectors. Selecting an appropriate process flow is crucial for achieving optimal technical performance in the beneficiation of wolframite and scheelite.

[0004] Existing tungsten beneficiation processes mostly use flotation-magnetic separation, such as those described in CN113369005A. However, this method overlooks the presence of residual reagents in the mineral after flotation, which can corrode magnetic separation equipment. Furthermore, existing tungsten beneficiation processes use a particle size of -74μm, representing 80%-95% of the weight, which can easily lead to tailing during magnetic separation. Summary of the Invention

[0005] In order to solve the above technical problems, the inventors have come up with the technical solution of the present invention through practice and summary. The present invention adopts the following technical solution:

[0006] A system for recovering tungsten from polymetallic tailings, comprising:

[0007] Magnetic separation box, which is equipped with a magnetic separation mechanism with a field strength of 1.0-1.3 Tesla;

[0008] Concentration tank 1 is provided with a feed port 1, a concentration port 1, and an overflow port 1. The feed port 1 is connected to the unloading chute, and the bottom of the concentration tank 1 is a conical structure;

[0009] A mixing tank is provided with an ore inlet, an ore outlet, a reagent adding pipe and a stirring mechanism. The ore inlet and the concentration port are connected. The stirring mechanism is used to mix the ore pulp and the reagent.

[0010] A flotation machine is provided with a pulp inlet, a pulp tank, and a recovery tank. The pulp inlet is connected to the ore outlet. A flotation tube and a scraper assembly are provided in the pulp tank. The scraper assembly is used to clean the flotation foam into the recovery tank.

[0011] A pickling mixing tank is provided with a feed port, a slurry outlet, an acid liquid adding pipe and a second stirring mechanism. The feed port is connected to the tailings outlet. The second stirring mechanism is used to mix the slurry and the reagent.

[0012] The second flotation machine is provided with a second pulp inlet, a second pulp tank, and a second recovery tank. The second pulp inlet is connected to the pulp outlet. The second pulp tank is provided with a second flotation tube and a second scraper assembly. The second scraper assembly is used to clean the flotation foam into the second recovery tank.

[0013] Concentration tank 2 is provided with feed port 2, concentrating port 2, and overflow port 2. Feed port 2 is connected to recovery tank 2. The bottom of concentrating tank 2 is a conical structure.

[0014] Centrifugal concentrator, the centrifugal concentrator is connected to the second concentration port.

[0015] Preferably, the magnetic separation mechanism includes a magnetic separation drum installed on a magnetic separation box and a reduction motor providing power for the magnetic separation drum. A permanent magnet group fixed in the magnetic separation box is independently provided on the outer side of the magnetic separation drum. The permanent magnet group is an arc-shaped structure with a central angle of 135°-180° and a top height lower than the highest point of the magnetic separation drum and a bottom height greater than the lowest point of the magnetic separation drum. End covers are installed at both ends of the magnetic separation drum. The two end covers are rotatably installed on a hollow tube. Both ends of the hollow tube are fixed on the magnetic separation box. One end of the hollow tube is an inlet end and the other end is an outlet end. An ore feeding pipe, a flushing water pipe, and an ore unloading water pipe are installed inside the inlet end.

[0016] A collecting hopper is provided inside the magnetic separation drum. The collecting hopper is a fan-shaped structure and the bottom is connected to the hollow tube. A partition plate is provided inside the hollow tube. The partition plate is provided below the side of the collecting hopper away from the outlet end.

[0017] One end of the flushing water pipe extends into the collection hopper and flushes the inner wall of the magnetic separation drum in the area covered by the permanent magnet group;

[0018] One end of the unloading water pipe extends into the collecting bucket and washes the inner wall of the magnetic separation drum away from the permanent magnet group and below the highest point of the magnetic separation drum.

[0019] Preferably, a cleaning scraper is installed on the side of the collecting hopper away from the permanent magnet group, and the cleaning scraper is used to contact the inner wall of the magnetic separation drum.

[0020] Preferably, the end cap on the side away from the inlet end has slurry discharge circular openings evenly distributed circumferentially;

[0021] A guide plate is provided at the bottom of the hollow tube. A certain gap is reserved between the bottom of the guide plate and the inner wall of the magnetic separation drum, and the bottom gradually extends downward from the outlet end to the inlet end.

[0022] Preferably, the first and second concentration tanks are provided with inclined baffles, with the bottoms of the baffles being located near the feed inlet;

[0023] A notch is provided at the bottom of the concentration tank, a polyurethane sealing strip is installed at the notch, and a deposition and conveying structure is provided outside the notch for conveying concentrated mineral particles to the concentration port.

[0024] Preferably, the deposition conveying structure includes a motor group, a conveying roller 1 and a conveying roller 2 installed on the outer walls of the concentration tank 1 and the concentration tank 2, the output end of the motor group is connected to the conveying roller 1, a deposition belt is installed on the outside of the conveying roller 1 and the conveying roller 2, and a clamping member is installed in the area between the conveying roller 1 and the conveying roller 2. The clamping member runs through the interior of the deposition belt, and a clamping roller evenly distributed across the gap is provided on the side of the clamping member opposite to the gap.

[0025] Preferably, a vibration block is provided on the side of the baffle facing away from the feed inlet, and horizontally arranged flow-uniform holes are evenly distributed on the surface of the baffle.

[0026] Preferably, the scraper assembly one and the scraper assembly two both include a scraper plate, a rotating shaft, and a driver. The driver is installed on the outside of the slurry tank one and the slurry tank two and is connected to the scraper plate through the corresponding rotating shaft. Two groups of scraper plates are provided, and the two groups of scraper plates are symmetrically distributed. The scraper plates both include a connecting plate and a movable plate. The connecting plate is fixedly installed on the rotating shaft, and the movable plate is slidably fitted on the outside of one end of the connecting plate away from the rotating shaft. A limit plate is provided on the movable plate, and the limit plate is used to limit the maximum extension stroke of the connecting plate relative to the movable plate. The movable plate is made of lightweight material and floats on the liquid surface inside the slurry tank.

[0027] Preferably, the first and second slurry tanks are both arc-shaped grooves, a sliding member is slidably fitted in the arc-shaped groove, a rotating stopper is rotatably mounted on the sliding member, and a torsion spring is installed at a rotation node between the rotating stopper and the sliding member;

[0028] Recovery tank 1 and recovery tank 2 are both equipped with a rotating disk and a fixed pulley. A flushing water pipe is installed on the rotating disk. Flushing nozzles are evenly distributed on the flushing water pipe. The flushing nozzles are used to flush the front and back of the movable plate.

[0029] A connecting rope is installed on the sliding member, and one end of the connecting rope passes around the fixed pulley and connects to the rotating disk;

[0030] Elastic limiting pin 1 is installed in the slurry trough 1 and slurry trough 2 areas at the top of the arc trough;

[0031] Elastic limiting pin 2 is installed in the recovery groove 1 and the recovery groove 2 areas located on the side of the rotating disk.

[0032] Preferably, the sliding member and the outer wall of the rotating disk are both provided with arc-shaped grooves;

[0033] Both elastic limit pin 1 and elastic limit pin 2 include a fixed plate, a sliding pin is installed on the fixed plate, a baffle and a limit plate are installed on the sliding pin, the baffle and the limit plate are respectively located on both sides of the fixed plate, and a spring body is provided on the sliding pin located between the baffle and the fixed plate, and one end of the sliding pin relative to the arc-shaped groove is an arc-shaped structure and is adapted to the arc-shaped groove.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. The present invention adopts a mineral separation process of first magnetic separation and then flotation, which can solve the problem of corrosion of magnetic separation equipment caused by the traditional mineral separation process of first flotation and then magnetic separation.

[0036] 2. The present invention obtains coarse wolframite ore and demagnetized tailings after magnetic separation, obtains wolframite concentrate by flotation of the coarse wolframite ore, obtains scheelite-fluorite concentrate by acid washing and blending of the demagnetized tailings, and obtains scheelite concentrate by centrifugal gravity separation of the scheelite-fluorite concentrate, thereby improving the grade and recovery rate of the scheelite concentrate.

[0037] 3. During concentration, the present invention adopts a directional conveying structure to transport the slurry at the bottom of the concentration tank to the concentration port. As the slurry concentration increases, the slurry tends to stick to the bottom of the concentration tank, resulting in a decrease in the subsequent mineral processing recovery rate. At the same time, since most existing concentration processes use sedimentation, the concentration operation time is long and the production cost is increased. Therefore, the use of a directional conveying structure can speed up the concentration efficiency without affecting the concentration effect.

[0038] 4. During flotation, the present invention utilizes an automatic scraper cleaning mechanism. After the scraper clears the flotation foam, it immediately rinses both sides of the flotation ...

[0039] 5. During magnetic separation, the present invention independently arranges the permanent magnet group on the outside of the magnetic separation drum, and the slurry can enter the magnetic separation drum from the hollow tube to complete the magnetic separation operation. The magnetic material after magnetic separation will fall into the collection bucket after breaking away from the coverage area of ​​the permanent magnet group, and the magnetic material adsorbed on the magnetic separation drum is flushed by the flushing water pipe during the magnetic separation to ensure that all the minerals in the magnetic group are separated. At the same time, the flushing water flow will impact the slurry at the bottom, which will have a certain negative impact on the magnetic separation effect. Therefore, a drainage plate is provided at the bottom of the hollow tube, and a certain gap is reserved between the bottom of the drainage plate and the inner wall of the magnetic separation drum, and the bottom gradually extends downward from the outlet end to the inlet end, draining the water to the magnetic separation drum at the inlet end, reducing the negative impact of water flow impact on magnetic separation. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 Schematic diagram of the system structure of the present invention.

[0041] Figure 2 It is an axial cross-sectional view of the magnetic separation box of the present invention.

[0042] Figure 3 It is a radial cross-sectional view of the magnetic separation box of the present invention.

[0043] Figure 4 This is a diagram of the internal structure of the concentration tank of the present invention.

[0044] Figure 5 for Figure 4 A partial schematic diagram of the notch in the middle inner wall.

[0045] Figure 6 for Figure 4 Side view of the concentrator tank.

[0046] Figure 7 It is a schematic diagram of the internal structure of the flotation machine of the present invention.

[0047] Figure 8 for Figure 7 A partial schematic diagram of the middle scraper plate.

[0048] Figure 9 for Figure 8 Partial schematic diagram of the middle arc groove.

[0049] Figure 10 for Figure 8 A partial schematic diagram of the middle rotating disk. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0051] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0052] like Figure 1 A system for recovering tungsten from polymetallic tailings is shown, comprising:

[0053] Magnetic separation box 100, a magnetic separation mechanism is provided in the magnetic separation box 100, and the field strength of the magnetic separation mechanism is 1.0-1.3 Tesla;

[0054] Concentration tank 200 is provided with a feed port 201, a concentration port 202, and an overflow port 203. The magnetically separated concentrate is connected to the feed port 201 via a pipeline. The bottom of the concentration tank 200 is a conical structure.

[0055] The mixing tank 300 is provided with an ore inlet 301, an ore outlet 302, a reagent addition pipe 303 and a stirring mechanism 1. The ore inlet 301 is connected to the concentration port 202. The stirring mechanism 1 is used to mix the ore pulp and the reagent.

[0056] A flotation machine 400 is provided with a slurry inlet 401, a slurry tank 402, and a recovery tank 403. The slurry inlet 401 is connected to the ore outlet 302. The slurry tank 402 is provided with a flotation tube 404 and a scraper assembly 1. The scraper assembly 1 is used to clean the flotation foam into the recovery tank 403.

[0057] The pickling and mixing tank 500 is provided with a feed port 501, a slurry outlet 502, a slurry outlet 503, a second reagent addition pipe 504 and a second stirring mechanism. The magnetic separation tailings are connected to the feed port 501 via a pipe. The second stirring mechanism is used to mix the slurry and the reagent.

[0058] The second flotation machine 600 is provided with a second pulp inlet 601, a second pulp tank 602, and a second recovery tank 603. The second pulp inlet 601 is connected to the pulp outlet 502. The second pulp tank 602 is provided with a second flotation tube 604 and a second scraper assembly. The second scraper assembly is used to clean the flotation foam into the second recovery tank 603.

[0059] Concentration tank 2 700 is provided with feed port 2 701, concentrating port 2 702, and overflow port 2 703. Feed port 2 701 is connected to recovery tank 2 603. The bottom of concentrating tank 2 700 is a conical structure.

[0060] The centrifugal concentrator 800 is connected to the second concentration port 702.

[0061] Magnetic separation is first performed to separate the coarse wolframite ore and tailings. The coarse wolframite ore is then concentrated in concentrator 200 to a concentration of approximately 30% (plus or minus 5 percentage points). On-off valves and concentration sensors are installed at concentrator port 202 and concentrator port 2 702. These sensors and valves are connected to a PLC controller, which collects concentration signals from the concentrator ports and transmits them to the controller. When the concentration reaches a set threshold, the controller controls the valves to open, discharging the concentrated slurry. The slurry is then flotated in flotation cell 400 to obtain wolframite concentrate. The wolframite tailings enter the acid washing and blending tank 500, where they are blended to a concentration of 30%. 4 kg / t of oxalic acid is then added for mixing and stirring, followed by the addition of reagents. Under acidic conditions, oxalic acid more effectively reacts with metal ions on the fluorite surface, forming stable complexes. This helps enhance the hydrophobicity of the fluorite particles, making them more easily captured by the flotation agent and floating to the slurry surface. This enhances the flotation efficiency of the fluorite while minimizing interference with the flotation of the scheelite. After blending, the scheelite-fluorite concentrate is obtained by flotation in the second flotation machine 600, and then concentrated to a concentration of 30% in the second concentration tank 700, and then obtained by the centrifugal concentrator 800.

[0062] In the above-mentioned embodiment, Figure 2 and Figure 3 As shown, the magnetic separation mechanism includes a magnetic separation drum 101 installed on a magnetic separation box 100 and a reduction motor 102 providing power for the magnetic separation drum 101. A permanent magnet group 103 fixed in the magnetic separation box 100 is independently provided on the outer side of the magnetic separation drum 101. The permanent magnet group 103 is an arc structure with a central angle of 135°-180° and a top height lower than the highest point of the magnetic separation drum 101 and a bottom height greater than the lowest point of the magnetic separation drum 101. End covers 104 are installed at both ends of the magnetic separation drum 101. The two end covers 104 are rotatably mounted on a hollow tube 105. Both ends of the hollow tube 105 are fixed on the magnetic separation box 100. One end of the hollow tube 105 is an inlet end and the other end is an outlet end. A feed pipe 107, a flushing water pipe 108, and an unloading water pipe 109 are installed inside the inlet end.

[0063] A collecting hopper 106 is provided inside the magnetic separation drum 101. The collecting hopper 106 is a fan-shaped structure and its bottom is connected to the hollow tube 105. A partition plate 110 is provided inside the hollow tube 105. The partition plate 110 is provided below the side of the collecting hopper 106 away from the outlet end.

[0064] One end of the flushing water pipe 108 extends into the collecting hopper 106 and flushes the inner wall of the magnetic separation drum 101 in the area covered by the permanent magnet group 103;

[0065] One end of the unloading water pipe 109 extends into the collecting bucket 106 and washes the inner wall of the magnetic separation drum 101 away from the permanent magnet group 103 and below the highest point of the magnetic separation drum 101.

[0066] A cleaning scraper is installed on the side of the collecting hopper 106 away from the permanent magnet group 103 , and the cleaning scraper is used to contact the inner wall of the magnetic separation drum 101 .

[0067] The end cover 104 on the side away from the inlet end has slurry discharge circular openings evenly distributed circumferentially;

[0068] A guide plate 111 is provided at the bottom of the hollow tube 105 . A certain gap is reserved between the bottom of the guide plate 111 and the inner wall of the magnetic separation drum 101 , and the bottom gradually extends downward from the outlet end to the inlet end.

[0069] The feed pipe 107 feeds the slurry into the bottom of the magnetic separation drum 101. The magnetic separation drum 101 absorbs the magnetic material in the slurry during rotation, and the remaining tailings flow to the outlet. Since the permanent magnet group 103 absorbs the magnetic material on the inner wall of the magnetic separation drum 101, it will be mixed with non-magnetic minerals. Therefore, the flushing water pipe 108 breaks up the agglomeration and removes the internal non-magnetic minerals. When the magnetic field is lost, the magnetic minerals will fall off and fall into the collection bucket 106, and then be discharged through the hollow pipe 105. The flushing water flow will cause channeling disturbance to the bottom slurry. The particle size of the mineral particles is generally around -74 microns, which affects the magnetic separation effect. Therefore, a diversion plate 111 is set to divert the flushing water to the inlet.

[0070] In the above-mentioned embodiment, Figure 4 and Figure 5 、 Figure 6 As shown, the concentrating tank 1 200 and the concentrating tank 2 700 are provided with an inclined baffle 204, and the bottom of the baffle 204 is provided near the feed port;

[0071] A notch is provided at the bottom of the concentration tank 1 200 and the concentration tank 2 700, and a polyurethane sealing strip 205 is installed at the notch. The polyurethane sealing strip 205 at the bottom cleans the surface of the deposition belt 209, and a deposition conveying structure is provided outside the notch for conveying concentrated mineral particles to the concentration port.

[0072] The deposition and conveying structure includes a motor group 206, a conveying roller 1 207 and a conveying roller 2 208 installed on the outer walls of the concentration tank 1 200 and the concentration tank 2 700. The output end of the motor group 206 is connected to the conveying roller 1 207. A deposition belt 209 is installed on the outside of the conveying roller 1 207 and the conveying roller 2 208. A clamping member 210 is installed in the area between the conveying roller 1 207 and the conveying roller 2 208. The clamping member 210 runs through the interior of the deposition belt 209. The side of the clamping member 210 opposite to the notch is provided with clamping rollers 211 evenly distributed across the notch.

[0073] A vibration block 212 is provided on the side of the baffle 204 facing away from the feed port 1 201 , and horizontally arranged flow-uniforming holes are evenly distributed on the surface of the baffle 204 .

[0074] The deposition belt 209 is attached to the outside of the notch by the pressing member 210 via the pressing roller 211 without affecting the operation of the deposition belt 209. The deposition belt 209 is made of anti-stick and wear-resistant materials and will not have over-wear problems in the short term. Secondly, the polyurethane sealing strip 205 will seal the deposition belt 209 to prevent leakage. The deposition belt 209 will transport the slurry particles downward at a speed of 10-20 mm / min, which will not affect the sedimentation and concentration of the slurry particles.

[0075] In the above-mentioned embodiment, Figures 7 to 10 As shown, the scraping bubble component 1 and the scraping bubble component 2 both include a scraping bubble plate 404, a rotating shaft 405, and a driver 406. The driver 406 is installed on the outside of the slurry tank 1 402 and the slurry tank 2 602 and is connected to the scraping bubble plate 404 via the corresponding rotating shaft 405. The scraping bubble plate 404 is provided with two groups, and the two groups of scraping bubble plates 404 are symmetrically distributed. The scraping bubble plates 404 both include a connecting plate 4041 and a movable plate 4042. The connecting plate 4041 is fixedly mounted on the rotating shaft 405, and the movable plate 404 042 slides together on the outside of the end of the connecting plate 4041 away from the rotating shaft 405. A limit plate 4043 is provided on the movable plate 4042. The limit plate 4043 is used to limit the maximum extension stroke of the connecting plate 4041 relative to the movable plate 4042. Baffles are provided on both sides of the limit plate 4043. The side of the baffle away from the limit plate 4043 gradually moves away from the movable plate 4042, and is used to return the cleaning liquid to the recovery tank. The movable plate 4042 is made of lightweight material and floats on the liquid surface inside the slurry tank.

[0076] The slurry tank 1 402 and the slurry tank 2 602 are both provided with an arc-shaped groove 4021, a sliding member 4022 is slidably fitted in the arc-shaped groove 4021, a rotating stopper 4023 is rotatably mounted on the sliding member 4022, and a torsion spring is installed at the rotation node of the rotating stopper 4023 and the sliding member 4022;

[0077] A rotating disk 4031 and a fixed pulley 4032 are installed in both the recovery tank 1 403 and the recovery tank 2 603 . A flushing pipe 4033 is installed on the rotating disk 4031 . Flushing nozzles are evenly distributed on the flushing pipe 4033 . The flushing nozzles are used to flush the front and back of the movable plate 4042 .

[0078] A connecting rope 4034 is installed on the sliding member 4022. One end of the connecting rope 4034 passes through the fixed pulley 4032 and is connected to the rotating disk 4031.

[0079] Elastic limiting pin 1 407 is installed in the slurry tank 1 402 and slurry tank 2 602 areas at the top of the arc-shaped tank 4021;

[0080] Elastic limiting pin 2 408 is installed in the recovery slot 1 403 and the recovery slot 2 603 area located on the side of the rotating disk 4031.

[0081] The outer walls of the sliding member 4022 and the rotating disk 4031 are both provided with arc-shaped grooves;

[0082] Both the elastic limit pin 1 407 and the elastic limit pin 2 408 include a fixed plate 4071, a sliding pin 4072 is installed on the fixed plate 4071, a blocking piece 4073 and a limiting piece 4074 are installed on the sliding pin 4072, the blocking piece 4073 and the limiting piece 4074 are respectively located on both sides of the fixed plate 4071, and a spring body 4075 is provided on the sliding pin 4072 located between the blocking piece 4073 and the fixed plate 4071, and the end of the sliding pin 4072 relative to the arc-shaped groove is an arc-shaped structure and is adapted to the arc-shaped groove.

[0083] The driver 406 drives the rotating shaft 405 to move the foam scraper 404 to clean and transport the flotation foam to the recovery tank. When the movable plate 4042 floats on the surface of the slurry tank, it cleans the flotation foam. After cleaning, the flushing nozzle on the flushing pipe 4033 flushes the front of the movable plate 4042. When the movable plate 4042 contacts the flushing nozzle, the flushing pipe 4033 drives the rotating disk 4031 to rotate. At the same time, the elastic limit pin 1 407 releases the restriction on the sliding part 4022 until the rotating disk 4031 is locked and fixed under the restriction of the elastic limit pin 2 408. The movable plate 4042 will slightly deform the flushing pipe or flushing pipe. As the rotation proceeds, the movable plate 4042 will partially retract the connecting plate 4041 into the interior under the action of gravity. When the recovered movable plate 4042 passes through the arc groove 4021, it will act on the rotating stopper 4023 to move the sliding body 4022 along the arc groove 4021. At the same time, the elastic limit pin 2 408 releases the restriction on the rotating disk 4031 until the elastic limit pin 1 407 locks the sliding body 4022 again and the flushing nozzle is reset. The movable plate 4022 will act on the rotating stopper 4023 to deflect relative to the sliding body 4022, and the movable plate 4022 will be reset under the action of the torsion spring through the rear rotating stopper 4023.

[0084] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. The replacement may be a replacement of a portion of a structure, device, or method step, or it may be a complete technical solution. Any equivalent replacement or modification based on the technical solution and inventive concept of the present invention shall be covered by the scope of protection of the present invention.

Claims

1. A system for recovering tungsten from polymetallic tailings, characterized in that: include: A magnetic separation box (100) is provided with a magnetic separation mechanism in the magnetic separation box (100), and the field strength of the magnetic separation mechanism is 1.0-1.3 Tesla; A concentrating tank (200) is provided with a feed port (201), a concentrating port (202), and an overflow port (203). The magnetically separated concentrate is connected to the feed port (201) via a pipeline. The bottom of the concentrating tank (200) is a conical structure. A mixing tank (300) is provided with an ore inlet (301), an ore outlet (302), a reagent adding pipe (303) and a stirring mechanism (301). The ore inlet (301) is connected to a concentration port (202). The stirring mechanism (301) is used to mix the ore pulp and the reagent. A flotation machine (400) is provided with a pulp inlet (401), a pulp tank (402), and a recovery tank (403). The pulp inlet (401) is connected to the ore outlet (302). A flotation tube (404) and a scraping foam component (404) are provided in the pulp tank (402). The scraping foam component (404) is used to clean the flotation foam into the recovery tank (403). The pickling and mixing tank (500) is provided with an ore feeding port (501), a slurry outlet (502), an oxalic acid addition pipe (503), a second reagent addition pipe (504) and a second stirring mechanism. The magnetically separated tailings are connected to the ore feeding port (501) via a pipe. The second stirring mechanism is used to mix the slurry and the reagent. A second flotation machine (600) is provided with a second pulp inlet (601), a second pulp tank (602), and a second recovery tank (603). The second pulp inlet (601) is connected to the pulp outlet (502). The second pulp tank (602) is provided with a second flotation tube (604) and a second scraping foam assembly. The second scraping foam assembly is used to clean the flotation foam into the second recovery tank (603). The second concentrator tank (700) is provided with a second feed port (701), a second concentrator port (702), and a second overflow port (703). The second feed port (701) is connected to the second recovery tank (603). The bottom of the second concentrator tank (700) is a conical structure. The centrifugal concentrator (800) is connected to the second concentration port (702).

2. A system for recovering tungsten from polymetallic tailings according to claim 1, characterized in that: The magnetic separation mechanism comprises a magnetic separation drum (101) mounted on a magnetic separation box (100) and a reduction motor (102) for providing power to the magnetic separation drum (101); a permanent magnet group (103) fixed in the magnetic separation box (100) is independently provided on the outer side of the magnetic separation drum (101); the permanent magnet group (103) is an arc-shaped structure with a central angle of 135°-180°, and the top height is lower than the highest point of the magnetic separation drum (101) and the bottom height is 135°-180°. The angle of the hollow tube (105) is greater than the lowest point of the magnetic separation drum (101), and end covers (104) are installed at both ends of the magnetic separation drum (101). The two end covers (104) are rotatably installed on the hollow tube (105). The two ends of the hollow tube (105) are fixed on the magnetic separation box (100). One end of the hollow tube (105) is an inlet end and the other end is an outlet end. The inlet end is internally installed with an ore feeding pipe (107), a flushing water pipe (108), and an ore unloading water pipe (109); A collecting hopper (106) is provided inside the magnetic separation drum (101). The collecting hopper (106) is a fan-shaped structure and its bottom is connected to the hollow tube (105). A partition plate (110) is provided inside the hollow tube (105). The partition plate (110) is provided below the collecting hopper (106) on a side away from the outlet end. One end of the flushing water pipe (108) extends into the collecting bucket (106) and performs a flushing operation on the inner wall of the magnetic separation drum (101) in the area covered by the permanent magnet group (103); One end of the ore unloading water pipe (109) extends into the collecting bucket (106) and washes the inner wall of the magnetic separation drum (101) away from the permanent magnet group (103) and below the highest point of the magnetic separation drum (101).

3. A system for recovering tungsten from polymetallic tailings according to claim 2, characterized in that: A cleaning scraper is installed on the side of the collecting hopper (106) away from the permanent magnet group (103), and the cleaning scraper is used to contact the inner wall of the magnetic separation drum (101).

4. A system for recovering tungsten from polymetallic tailings according to claim 3, characterized in that: The end cover (104) on the side away from the inlet end is provided with slurry discharge circular openings evenly distributed circumferentially; A guide plate (111) is provided at the bottom of the hollow tube (105), a certain gap is reserved between the bottom of the guide plate (111) and the inner wall of the magnetic separation drum (101), and the bottom gradually extends downward from the outlet end to the inlet end.

5. The system for recovering tungsten from polymetallic tailings according to claim 1, characterized in that: The first concentration tank (200) and the second concentration tank (700) are provided with an inclined baffle (204), and the bottom of the baffle (204) is arranged near the feed port; The bottoms of the first concentration tank (200) and the second concentration tank (700) are provided with notches, polyurethane sealing strips (205) are installed at the notches, and a deposition and conveying structure is provided outside the notches for conveying concentrated mineral particles to the concentration port.

6. A system for recovering tungsten from polymetallic tailings according to claim 5, characterized in that: The deposition and conveying structure comprises a motor group (206), a conveying roller (207) and a conveying roller (208) installed on the outer walls of the first concentration tank (200) and the second concentration tank (700); the output end of the motor group (206) is connected to the first conveying roller (207); a deposition belt (209) is installed on the outer sides of the first conveying roller (207) and the second conveying roller (208); a pressing member (210) is installed in the area between the first conveying roller (207) and the second conveying roller (208); the pressing member (210) runs through the interior of the deposition belt (209); and a pressing roller (211) evenly distributed across the notch is provided on the side of the pressing member (210) opposite to the notch.

7. A system for recovering tungsten from polymetallic tailings according to claim 6, characterized in that: A vibration block (212) is provided on the side of the baffle (204) facing away from the feed port (201), and horizontally arranged flow-uniform holes are evenly distributed on the surface of the baffle (204).

8. A system for recovering tungsten from polymetallic tailings according to claim 4 or 5, characterized in that: The first and second scraping foam components each include a scraping foam plate (404), a rotating shaft (405), and a driver (406). The driver (406) is installed on the outside of the first slurry tank (402) and the second slurry tank (602) and is connected to the scraping foam plate (404) via the corresponding rotating shaft (405). The scraping foam plates (404) are provided in two groups, and the two groups of scraping foam plates (404) are symmetrically distributed. The scraping foam plates (404) each include a connecting plate (4041) and a movable plate (4042). 42), the connecting plate (4041) is fixedly mounted on the rotating shaft (405), the movable plate (4042) is slidably fitted on the outer side of one end of the connecting plate (4041) away from the rotating shaft (405), a limit plate (4043) is provided on the movable plate (4042), the limit plate (4043) is used to limit the maximum extension stroke of the connecting plate (4041) relative to the movable plate (4042), and the movable plate (4042) is made of a lightweight material and floats on the liquid surface inside the slurry tank.

9. A system for recovering tungsten from polymetallic tailings according to claim 8, characterized in that: The slurry tank 1 (402) and the slurry tank 2 (602) are both provided with an arc groove (4021), a sliding member (4022) is slidably fitted in the arc groove (4021), a rotating block (4023) is rotatably mounted on the sliding member (4022), and a torsion spring is installed at the rotation node of the rotating block (4023) and the sliding member (4022); A rotating disk (4031) and a fixed pulley (4032) are installed in both the recovery tank 1 (403) and the recovery tank 2 (603). A flushing pipe (4033) is installed on the rotating disk (4031). Flushing nozzles are evenly distributed on the flushing pipe (4033). The flushing nozzles are used to flush the front and back sides of the movable plate (4042). A connecting rope (4034) is installed on the sliding member (4022), and one end of the connecting rope (4034) is passed around the fixed pulley (4032) and connected to the rotating disk (4031); Elastic limiting pin 1 (407) is installed in the slurry tank 1 (402) and slurry tank 2 (602) areas at the top of the arc-shaped tank (4021); Elastic limiting pin 2 (408) is installed in the recovery slot 1 (403) and the recovery slot 2 (603) areas located on the side of the rotating disk (4031).

10. The system for recovering tungsten from polymetallic tailings according to claim 9, characterized in that: The outer walls of the sliding member (4022) and the rotating disk (4031) are both provided with arc-shaped grooves; The elastic limiting pin 1 (407) and the elastic limiting pin 2 (408) both include a fixed plate (4071), a sliding pin (4072) is mounted on the fixed plate (4071), a blocking piece (4073) and a limiting piece (4074) are mounted on the sliding pin (4072), the blocking piece (4073) and the limiting piece (4074) are respectively located on both sides of the fixed plate (4071), and a spring body (4075) is provided on the sliding pin (4072) located between the blocking piece (4073) and the fixed plate (4071), and one end of the sliding pin (4072) opposite to the arc-shaped groove is an arc-shaped structure and is adapted to the arc-shaped groove.

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