Iron mine tailing pond wastewater recycling device

Abstract

The application discloses an iron mine tailing pond wastewater recycling device, which comprises a slag slurry pump, a primary filter tank, a plurality of comprehensive filter barrels, a medicament tank, a microbial incubator and a clean water tank. An annular flow guide cover is arranged in the middle of the comprehensive filter barrel. A flow guide pipe extends from one side of the bottom of the comprehensive filter barrel to the upper part of the center of the flow guide cover. An annular first filter plate and a second filter plate are arranged on the outer side of the bottom of the flow guide cover from bottom to top. The second filter plate is slidably connected to the flow guide cover. A plurality of sludge collecting boxes are arranged at the bottom of the first filter plate for collecting the precipitated sludge. The application can stratify the precipitated sludge and retain the sludge with high microbial activity, so that the integrated operation of rapid sampling and subsequent cultivation of the sludge can be realized, and a new idea is provided for the indigenous microbial flora to treat the tailing pond wastewater.

Description

Technical Field

[0001] This invention relates to the field of tailings pond wastewater treatment technology, specifically to a device for recycling and reusing wastewater from iron ore tailings ponds. Background Technology

[0002] A tailings dam is a dammed or enclosed area used to store tailings or other industrial waste discharged after ore beneficiation in metal or non-metal mines. Ore beneficiation plants produce large quantities of fine-grained tailings, and the tailings water often contains various reagents. Without treatment, this will inevitably cause serious pollution to the environment surrounding the beneficiation plant. Properly storing tailings in tailings dams, and recycling the tailings water after clarification within the dam, can effectively protect the environment.

[0003] Tailings pond wastewater typically contains heavy metals (such as Cu, Pb, Zn, Cd, and As), suspended solids (SS), residual mineral processing reagents (such as xanthates and black reagents), cyanide (if present), and acidic / alkaline substances. Targeted treatment is required to meet discharge standards or for reuse. Tailings pond wastewater treatment technologies generally include physical treatment methods (sedimentation, filtration), chemical treatment methods (neutralization, sulfidation, oxidation, flocculation), and biological treatment methods (constructed wetlands, biosorption), often employing a combination of methods. While single physical treatment methods have limited effectiveness, chemical treatment methods are prone to secondary pollution. Microbial remediation offers advantages such as low energy consumption, economy, and environmental friendliness. Due to the complexity and diversity of microbial species, they synergistically promote each other within the growth system, forming a stable microbial ecosystem. Therefore, increasing the proportion of biological treatment methods is of great significance for environmental protection.

[0004] Currently, most tailings pond wastewater treatment utilizes cultured exogenous microorganisms. However, these exogenous microorganisms suffer from poor adaptability, high mutation rates, high costs, and uncertain environmental and ecological impacts, limiting their application. Indigenous microorganisms, on the other hand, possess advantages such as diversity, strong adaptability, and cometolytic activity. By altering environmental conditions and adding nutrients, their activity can be stimulated and domesticated, increasing their potential for application in the remediation of contaminated soil and groundwater. Therefore, increasing the utilization of indigenous microorganisms will lead to a qualitative leap in tailings pond wastewater treatment. Currently, the utilization of indigenous microorganisms in iron ore tailings pond wastewater recycling and reuse devices is still very limited.

[0005] For example, utility model patent CN217459084U provides a high-efficiency tailings wastewater treatment system, including a vibrating dewatering screen, a thickener, a dosing tank, a clear water tank, and a filter press. The inlet of the vibrating dewatering screen is connected to a tailings pump, and the outlet of the vibrating dewatering screen is connected to the thickener via a tailings wastewater metering pump. The dosing tank is connected to the thickener via a reagent metering pump. A mixing mechanism is installed at the top of the thickener, and the tailings wastewater metering pump and the reagent metering pump are connected to the mixing mechanism. The overflow port of the thickener is connected to the clear water tank via a pipe. The discharge end of the thickener is connected to the filter press via a lift pump, and the liquid outlet of the filter press is connected to the clear water tank. A buffer tank is installed between the vibrating dewatering screen and the tailings wastewater metering pump. While this system can improve the treatment efficiency of tailings wastewater, it lacks components for reusing indigenous microorganisms, thus limiting its treatment effect and making it environmentally unfriendly. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a device for recycling and reusing wastewater from iron ore tailings ponds.

[0007] The technical solution of this invention is:

[0008] A wastewater recycling and reuse device for iron ore tailings ponds includes a slurry pump, a primary filter tank, several integrated filter barrels, a reagent tank, a microbial incubator, and a clear water tank.

[0009] The slurry pump is equipped with an inlet pipe and an outlet pipe. The inlet pipe is connected to the inside of the tailings dam, and the outlet pipe is connected to the primary filter tank. The output end of the primary filter tank is equipped with several guide pipes, and each guide pipe is connected to each of the integrated filter tanks in a corresponding manner.

[0010] The integrated filter barrel has an annular flow guide hood in the middle. The flow guide pipe extends from one side of the bottom of the integrated filter barrel through the integrated filter barrel to the upper part of the center of the flow guide hood. The bottom of the flow guide hood is fixedly connected to the flow guide pipe. The outer side of the bottom of the flow guide hood is provided with an annular first filter plate and a second filter plate from bottom to top. The first filter plate is fixedly connected to the outer wall of the flow guide hood. The second filter plate is slidably connected to the flow guide hood. The bottom of the first filter plate is provided with several sludge collection boxes for collecting settled sludge.

[0011] The top of the integrated filter tank is equipped with an overflow pipe, which is connected to the reagent tank, which is connected to the clear water tank, and each of the sludge collection boxes is connected to the microbial incubator.

[0012] Furthermore, the pore size of the first filter plate is 8-10 mesh, and the pore size of the second filter plate is 10-12 mesh.

[0013] Explanation: By optimizing and adjusting the pore size of the first and second filter plates, most of the sludge inside the integrated filter tank can settle downwards through the second filter plate, while some can continue to settle through the first filter plate. Meanwhile, sludge with high microbial activity is retained between the first and second filter plates.

[0014] Furthermore, the upper surface of the first filter plate is provided with several scrapers, and each scraper is fixedly connected to the other by a rotating ring. The rotating ring rotates and is limited in its upper and lower position to the outer wall of the guide shroud. The connection between the rotating ring and each scraper is connected to the bottom of the second filter plate by a spring telescopic rod. The second filter plate is driven to rotate by a drive motor located above the integrated filter barrel. Each side of the second filter plate is provided with a cylindrical protrusion, which is slidably connected to the arc-shaped grooves provided on both sides of the inner wall of the integrated filter barrel, so as to allow the second filter plate to slide up and down while rotating. The bottom of each scraper corresponds to a mud collection box.

[0015] Note: The scraper, sludge collection box and other related components enable convenient, fast and efficient recycling of sludge between the first and second filter plates.

[0016] Furthermore, the inner wall of the rotating ring is provided with a ring-shaped limiting protrusion, which is rotatably connected to the annular groove provided on the outer wall of the flow guide.

[0017] Note: The limiting protrusion and the annular groove prevent the rotating ring from moving up and down during rotation.

[0018] Furthermore, the number of scrapers and mud collection boxes is 2 to 4, and when the second filter plate is at its lowest point, each scraper and each mud collection box corresponds to and overlaps with each other.

[0019] Explanation: By overlapping the scraper with the sludge collection box, unwanted sludge is reduced, allowing highly microbially active sludge to fall between the first and second filter plates as the scraper rotates.

[0020] Furthermore, the output end of the drive motor is provided with a telescopic connecting rod, and the end of the telescopic connecting rod is provided with a bevel gear. The bevel gear is engaged with a tooth groove provided on the inner edge of the second filter plate. The guide shroud is provided with an upwardly extending slot at the connection between the bevel gear and the tooth groove. The telescopic connecting rod includes an inner rod and an outer rod that are slidably sleeved. The outer rod is connected to the output end of the drive motor. Each of the outer sides of the inner rod is provided with a limiting slide bar, and the limiting slide bar is slidably connected with the limiting slide grooves provided on the inner sides of the outer rod.

[0021] Explanation: The stability of the telescopic upright is maintained by the limiting slide bar and limiting slide groove when it extends, retracts, drives the bevel gear to rotate and rise.

[0022] Furthermore, the bottom of the flow guide shroud is provided with water permeable holes arranged above the first filter plate, the water permeable holes extend to the highest movable point of the second filter plate, the top of the flow guide shroud extends beyond the top of the integrated filter barrel, and the bottom of the flow guide shroud is open.

[0023] Note: The permeable holes not only facilitate smoother sludge settling at the bottom of the guide hood, but also enhance sludge discharge efficiency during the sludge discharge stage by adjusting the raising and lowering of the second filter plate, thus offering versatility.

[0024] Furthermore, the microbial culture box is equipped with a drying box for drying sludge. The top of the sludge collection box is open, and the bottom of the sludge collection box is inclined outward from the center of the integrated filter barrel. The sludge guide pipe at the end of the sludge collection box passes through the integrated filter barrel and connects to the drying box. A heating box is provided on one side of the drying box, and a heating rod is provided at the bottom of the heating box. A culture medium replenishment box is provided on one side of the heating box.

[0025] Note: The microbial incubator allows for the immediate cultivation of sludge with high microbial activity, enabling the use of the cultured indigenous microbial community in subsequent wastewater treatment.

[0026] Furthermore, the number of integrated filter buckets is 3 to 8. The side wall of the integrated filter bucket is provided with an observation window corresponding to the positions of the first filter plate and the second filter plate. The chemical tank and the clear water tank, as well as the microbial incubator and the chemical tank, are provided with conduits. The guide pipe, overflow pipe, conduit, and mud guide pipe are all equipped with solenoid valves.

[0027] Note: The observation window facilitates observation during sludge removal, and multiple solenoid valves enable control of the entire system.

[0028] The beneficial effects of this invention are:

[0029] The design of this iron ore tailings pond wastewater recycling device is based on how to cultivate indigenous microorganisms in the tailings pond wastewater and immediately use them in subsequent wastewater treatment. Therefore, we have set up a dedicated integrated filter tank, which can stratify the settled sludge. In the stratified sludge, the sludge located between the first and second filter plates retains highly active microbial sludge with abundant substrate. The organic particles settled in the upper layer (such as extracellular polymeric substances (EPS) and residual organic matter) are largely degraded here. At the same time, the metabolic diversity is strong, with facultative anaerobic bacteria (such as denitrifying bacteria) and aerobic bacteria coexisting, forming a complex ecological niche. The sludge flocs are the loosest in this area, with a large specific surface area, which is conducive to the attachment and growth of microorganisms. At the same time, we have designed supporting structural components for sludge sampling in this area, so as to realize the integrated operation of rapid sludge sampling and subsequent cultivation, providing a new approach for the treatment of tailings pond wastewater by indigenous microbial communities. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of a wastewater recycling and reuse device for iron ore tailings ponds according to the present invention.

[0031] Figure 2 This is a schematic diagram of the integrated filter barrel in an iron ore tailings pond wastewater recycling and reuse device of the present invention;

[0032] Figure 3 This is a schematic diagram of the internal structure of the integrated filter barrel of the present invention;

[0033] Figure 4 This is a schematic diagram of the internal structure of the integrated filter barrel of the present invention after omitting the flow guide cover;

[0034] Figure 5 This is a schematic diagram of the internal structure of the integrated filter barrel of the present invention after omitting the flow guide cover and the second filter plate.

[0035] Figure 6 This is a schematic diagram of the inner wall arc groove structure of the integrated filter bucket of the present invention in the main view;

[0036] Figure 7 This is a top view of the integrated filter barrel of the present invention;

[0037] Figure 8 This is a schematic diagram of the internal structure of the integrated filter bucket of the present invention from the front view;

[0038] Figure 9 This is a schematic diagram of the internal second filter plate after rotation when viewed from the front of the integrated filter barrel of the present invention.

[0039] Figure 10 This is a schematic diagram of the flow guide structure of the present invention;

[0040] Figure 11This is a cross-sectional view of the telescopic connecting rod of the present invention;

[0041] Figure 12 This is a schematic diagram of the internal structure of the microbial incubator of the present invention.

[0042] Among them, 1-slurry pump, 11-inlet pipe, 12-outlet pipe, 2-primary filter tank, 21-guide pipe, 3-comprehensive filter barrel, 31-first filter plate, 32-second filter plate, 321-protrusion, 322-tooth groove, 33-sludge collection box, 331-sludge guide pipe, 34-overflow pipe, 35-scraper, 36-rotating ring, 361-limiting protrusion, 37-spring telescopic rod, 38-arc groove, 39-viewing... Observation window, 4-reagent pool, 41-conduit, 5-microbial incubator, 51-drying oven, 52-heating box, 53-heating rod, 54-culture medium replenishment box, 6-clear water pool, 7-flow guide hood, 71-annular groove, 72-groove, 73-water permeable hole, 8-drive motor, 81-telescopic connecting rod, 82-bevel gear, 83-inner rod, 84-outer rod, 85-limiting slide bar, 86-limiting slide groove, 9-solenoid valve. Detailed Implementation

[0043] Example 1

[0044] like Figure 1 As shown, a wastewater recycling and reuse device for iron ore tailings ponds includes a slurry pump 1, a primary filter tank 2, four integrated filter barrels 3, a reagent tank 4, a microbial incubator 5, and a clear water tank 6. The slurry pump 1 is equipped with an inlet pipe 11 and an outlet pipe 12. The slurry pump 1 is a commercially available high-power slurry pump. The inlet pipe 11 is connected to the inside of the tailings pond, and the outlet pipe 12 is connected to the primary filter tank 2. The output end of the primary filter tank 2 is equipped with several guide pipes 21, and each guide pipe 21 is connected to each integrated filter barrel 3 in a corresponding manner. The primary filter tank 2 is a commercially available gravity-type valveless filter tank.

[0045] like Figures 2-4 As shown, the integrated filter bucket 3 has an annular flow guide hood 7 in the middle. The flow guide pipe 21 extends from one side of the bottom of the integrated filter bucket 3 through the integrated filter bucket 3 to the upper part of the center of the flow guide hood 7. The bottom of the flow guide hood 7 is fixedly connected to the flow guide pipe 21. The bottom outer side of the flow guide hood 7 is provided with an annular first filter plate 31 and a second filter plate 32 from bottom to top. The aperture of the first filter plate 31 is 9 mesh and the aperture of the second filter plate 32 is 11 mesh. The first filter plate 31 is fixedly connected to the outer wall of the flow guide hood 7, and the second filter plate 32 is slidably connected to the flow guide hood 7. The bottom of the first filter plate 31 is provided with several sludge collection boxes 33 for collecting settled sludge.

[0046] like Figures 5-8 , Figure 10As shown, the upper surface of the first filter plate 31 is provided with three scrapers 35, which are fixedly connected to each other by a rotating ring 36. The rotating ring 36 rotates and is connected to the outer wall of the guide shroud 7 at both the top and bottom. The inner wall of the rotating ring 36 is provided with a ring-shaped limiting protrusion 361, which is rotatably connected to the annular groove 71 provided on the outer wall of the guide shroud 7. The connection between the rotating ring 36 and each scraper 35 is connected to the bottom of the second filter plate 32 by a spring telescopic rod 37. The second filter plate 32 is driven to rotate by a drive motor 8 located above the integrated filter barrel 3. The two sides of the second filter plate 32 Each is provided with a cylindrical protrusion 321, which is slidably connected to the arc grooves 38 provided on both sides of the inner wall of the integrated filter barrel 3, so that the second filter plate 32 can slide up and down while rotating. The bottom of each scraper 35 corresponds to a mud collection box 33. When the second filter plate 32 is at its lowest point, the positions of each scraper 35 and each mud collection box 33 are aligned one by one. The bottom of the guide shroud 7 is provided with water permeable holes 73 arranged above the first filter plate 31. The water permeable holes 73 extend to the highest movable point of the second filter plate 32. The top of the guide shroud 7 exceeds the top of the integrated filter barrel 3, and the bottom of the guide shroud 7 is open.

[0047] like Figure 9 , Figure 11 As shown, the output end of the drive motor 8 is provided with a telescopic connecting rod 81, and the end of the telescopic connecting rod 81 is provided with a bevel gear 82. The bevel gear 82 is meshed with the tooth groove 322 provided on the inner edge of the second filter plate 32. The guide shroud 7 is provided with an upwardly extending slot 72 at the connection between the bevel gear 82 and the tooth groove 322. The telescopic connecting rod 81 includes an inner rod 83 and an outer rod 84 that are slidably sleeved. The outer rod 84 is connected to the output end of the drive motor 8. A limiting slide bar 85 is provided on each of the outer sides of the inner rod 83. The limiting slide bar 85 is slidably connected to the limiting slide groove 86 provided on both sides of the inner side of the outer rod 84.

[0048] like Figure 1 , Figure 2 , Figure 12As shown, the top of the integrated filter tank 3 is equipped with an overflow pipe 34, which is connected to the reagent tank 4. The reagent tank 4 is connected to the clear water tank 6. Each sludge collection box 33 is connected to the microbial incubator 5. The microbial incubator 5 is equipped with a drying chamber 51 for drying sludge. The drying chamber 51 is equipped with a drying fan. The top of the sludge collection box 33 is open, and the bottom of the sludge collection box 33 is inclined outward from the center of the integrated filter tank 3. The sludge guide pipe 331 at the end of the sludge collection box 33 passes through the integrated filter tank 3 and connects to the drying chamber 51. A heating box is provided on one side of the drying chamber 51. 52. A heating rod 53 is provided at the bottom of the heating box 52. The heating rod 53 is a commercially available heating rod. A culture medium replenishment box 54 is provided on one side of the heating box 52. The culture medium can be LB culture medium or R2A culture medium. An observation window 39 is provided on the side wall of the integrated filter bucket 3 at the position corresponding to the first filter plate 31 and the second filter plate 32. A conduit 41 is provided between the reagent pool 4 and the clear water pool 6, and between the microbial culture box 5 and the reagent pool 4. A solenoid valve 9 is provided on the guide pipe 21, the overflow pipe 34, the conduit 41, and the mud guide pipe 331. The solenoid valve is a commercially available ZCQ pneumatic solenoid valve.

[0049] Example 2

[0050] The difference between this embodiment and Embodiment 1 is that:

[0051] There are 3 integrated filter canisters.

[0052] Example 3

[0053] The difference between this embodiment and Embodiment 1 is that:

[0054] The integrated filter canister contains 8 units.

[0055] Example 4

[0056] The difference between this embodiment and Embodiment 1 is that:

[0057] The upper surface of the first filter plate 31 is provided with two scrapers 35, and the bottom of each scraper 35 corresponds to a mud collection box 33.

[0058] Example 5

[0059] The difference between this embodiment and Embodiment 1 is that:

[0060] The upper surface of the first filter plate 31 is provided with four scrapers 35, and the bottom of each scraper 35 corresponds to a mud collection box 33.

[0061] Note: When the sludge discharge frequency is high, more scrapers 35 can be used. At the same time, the vertical movement of the second filter plate 32 can be reduced during sampling. When the sludge discharge frequency is low, fewer scrapers 35 can be used. At this time, more sludge accumulates and the sludge discharge resistance is greater. Therefore, the vertical movement of the second filter plate 32 is also higher, and the higher elevation of the permeable holes 73 promotes sludge discharge.

[0062] Example 6

[0063] The difference between this embodiment and Embodiment 1 is that:

[0064] The first filter plate 31 has an 8-mesh pore size, and the second filter plate 32 has a 10-mesh pore size.

[0065] Example 7

[0066] The difference between this embodiment and Embodiment 1 is that:

[0067] The first filter plate 31 has a pore size of 10 mesh, and the second filter plate 32 has a pore size of 12 mesh.

[0068] Working principle:

[0069] The working principle of a wastewater recycling and reuse device for iron ore tailings ponds according to the present invention will be briefly described below.

[0070] In operation, the tailings wastewater to be treated is first pumped to the primary filter tank 2 by the slurry pump 1. Primary filtration removes impurities such as stones, fallen leaves, industrial waste, and plastics. The wastewater then flows through the guide pipe 21 into the integrated filter tank 3, exits from the top of the guide hood 7, flows downwards, and settles. The settled sludge is filtered by the second filter plate 32 and the first filter plate 31, and undergoes stratified sedimentation inside the guide hood 7. The permeable holes 73 also promote sedimentation between the second filter plate 32 and the first filter plate 31 to some extent, creating an aerobic-anaerobic transition zone rich in substrate. The upper layer contains settled organic particles (such as extracellular aggregates). The sludge (EPS, residual organic matter) is degraded in large quantities here. At the same time, the metabolic diversity is strong, and facultative anaerobic bacteria (such as denitrifying bacteria) and aerobic bacteria coexist, forming a complex ecological niche. The sludge flocs are the loosest in this area, with a large specific surface area, which is conducive to the attachment and growth of microorganisms. In the end, sludge with high microbial activity is retained between the second filter plate 32 and the first filter plate 31. The sludge below the first filter plate 31 is discharged through the sludge discharge port at the bottom of the integrated filter tank 3, while the sludge above the second filter plate 32 can be pumped out by the pump group. It can be selected to be pumped out when the second filter plate 32 rises to the maximum height. The settled wastewater enters the chemical tank 4 through the overflow pipe 34.

[0071] For the discharge of sludge with high microbial activity, we can set the frequency of each discharge. For example, if the discharge frequency is once every 12 hours, the drive motor 8 will be turned on once every 12 hours to drive the telescopic upright 81 to rotate, which in turn drives the bevel gear 82 to rotate. While the bevel gear 82 is rotating, it will drive the second filter plate 32 to rotate through the meshing action with the tooth groove 322. When the second filter plate 32 rotates, its two ends are stably fixed by the engagement of the protrusion 321 with the arc groove 38. Since the arc groove 38 is arc-shaped and rising, the protrusion 321 will move in the arc groove 38 while rotating, and drive the second filter plate 32 to move upward, exposing all the water permeable holes 73 between the second filter plate 32 and the first filter plate 31. By increasing the flow rate between the second filter plate 32 and the first filter plate 31, the sludge discharge is promoted. The limiting slide bar 85 slides in the limiting slide groove 86 to ensure the stable rotation and extension of the telescopic upright 81.

[0072] At the same time, as the second filter plate 32 rotates, the rotating ring 36 connected by multiple spring telescopic rods 37 also rotates. The limiting protrusion 361 rotates inside the annular groove 71 to ensure that the rotating ring 36 remains stable up and down when it rotates, thereby driving each scraper 35 to rotate, so that each scraper 35 rotates to the position corresponding to the next sludge collection box 33. Since the initial position of the scraper 35 is above the sludge collection box 33, this process just makes the sludge settled between the two scrapers 35 scraped into the corresponding sludge collection box 33. At this time, the second filter plate 32 also reaches its maximum position, and the water permeable hole 73 is fully exposed between the second filter plate 32 and the first filter plate 31. Through the water flow promotion and the tilting action of the sludge collection box 33, the sludge is discharged into the sludge guide pipe 331, thereby opening the corresponding solenoid valve 9 for recycling.

[0073] The above-mentioned sludge recovery process lasts for 5 to 10 minutes. Then, the second filter plate 32 is reset in the same way as above, so that it can carry out sludge sedimentation in the next cycle.

[0074] The obtained sludge with high microbial activity was dried in drying oven 51, then mixed with distilled water at a ratio of 1g:100mL and added to heating oven 52. The mixture was then incubated at 35℃ with shaking for 12–24 hours. After standing, the supernatant was collected and inoculated into sterilized liquid culture medium at a 10% inoculum level. The medium was then incubated at 35℃ in the dark in heating oven 52 under constant temperature and sealed conditions. The above steps were repeated every 3 days. After 5 generations, the sludge could be used for subsequent wastewater treatment. Due to the relatively long cultivation period, each batch of treated sludge may use microbial bacteria sampled from the previous batch, thus ultimately achieving dynamic recycling.

[0075] 10 mL of microbial flora grown for 3 days was added to the wastewater in reagent tank 4 for treatment. At this point, the wastewater in reagent tank 4 had already undergone chemical neutralization and flocculation, and the pH was adjusted to 6-7 before further microbial treatment. Ultimately, this process can remove Zn and Cr from the tailings pond wastewater. 6+ The removal rate of heavy metal pollutants reaches over 98%, and the use of indigenous bacteria can save about 5-10% of costs, making it commercially valuable.

Claims

1. A device for recycling and reusing wastewater from iron ore tailings ponds, characterized in that, It includes a slurry pump (1), a primary filter tank (2), several integrated filter barrels (3), a reagent tank (4), a microbial incubator (5), and a clear water tank (6); The slurry pump (1) is equipped with an inlet pipe (11) and an outlet pipe (12). The inlet pipe (11) is connected to the inside of the tailings dam, and the outlet pipe (12) is connected to the primary filter tank (2). The primary filter tank (2) has several guide pipes (21) at its output end, and each guide pipe (21) is connected to each of the integrated filter tanks (3) in a corresponding manner. The integrated filter barrel (3) is provided with an annular flow guide hood (7) in the middle. The flow guide pipe (21) extends from the bottom side of the integrated filter barrel (3) through the integrated filter barrel (3) to the upper part of the center of the flow guide hood (7). The bottom of the flow guide hood (7) is fixedly connected to the flow guide pipe (21). The bottom outer side of the flow guide hood (7) is provided with an annular first filter plate (31) and a second filter plate (32) from bottom to top. The first filter plate (31) is fixedly connected to the outer wall of the flow guide hood (7). The second filter plate (32) is slidably connected to the flow guide hood (7) up and down. The bottom of the first filter plate (31) is provided with a number of sludge collection boxes (33) for collecting settled sludge. The top of the integrated filter bucket (3) is provided with an overflow pipe (34), which is connected to the reagent tank (4). The reagent tank (4) is connected to the clear water tank (6). Each of the sludge collection boxes (33) is connected to the microbial incubator (5), which is connected to the reagent tank (4). The bottom of the flow guide (7) is provided with water permeable holes (73) arranged above the first filter plate (31). The water permeable holes (73) extend to the highest movable point of the second filter plate (32). The top of the flow guide (7) extends beyond the top of the integrated filter barrel (3). The bottom of the flow guide (7) is open.

2. The wastewater recycling and reuse device for iron ore tailings ponds according to claim 1, characterized in that, The first filter plate (31) has a pore size of 8-10 mesh, and the second filter plate (32) has a pore size of 10-12 mesh.

3. The wastewater recycling and reuse device for iron ore tailings ponds according to claim 1, characterized in that, The upper surface of the first filter plate (31) is provided with several scrapers (35). Each scraper (35) is fixedly connected to the other by a rotating ring (36). The rotating ring (36) is connected to the outer wall of the guide shroud (7) for rotation and upper and lower limit connection. The connection between the rotating ring (36) and each scraper (35) is connected to the bottom of the second filter plate (32) by a spring telescopic rod (37). The second filter plate (32) is driven to rotate by a drive motor (8) located above the integrated filter barrel (3). Each side of the second filter plate (32) is provided with a cylindrical protrusion (321). The protrusion (321) is slidably connected to the arc groove (38) provided on both sides of the inner wall of the integrated filter barrel (3) for making the second filter plate (32) slide up and down while rotating. The bottom of each scraper (35) corresponds to a mud collection box (33).

4. The wastewater recycling and reuse device for iron ore tailings ponds according to claim 3, characterized in that, The inner wall of the rotating ring (36) is provided with a ring-shaped limiting protrusion (361), and the limiting protrusion (361) is rotatably connected to the annular groove (71) provided on the outer wall of the guide shroud (7).

5. A wastewater recycling and reuse device for iron ore tailings ponds according to claim 3, characterized in that, The number of scrapers (35) and mud collection boxes (33) is 2 to 4, and when the second filter plate (32) is at its lowest point, the positions of each scraper (35) and each mud collection box (33) correspond to each other.

6. A wastewater recycling and reuse device for iron ore tailings ponds according to claim 3, characterized in that, The output end of the drive motor (8) is provided with a telescopic connecting rod (81), and the end of the telescopic connecting rod (81) is provided with a bevel gear (82). The bevel gear (82) meshes with the tooth groove (322) provided on the inner edge of the second filter plate (32). The guide cover (7) is provided with an upwardly extending slot (72) at the connection between the bevel gear (82) and the tooth groove (322). The telescopic connecting rod (81) includes an inner rod (83) and an outer rod (84) that are slidably sleeved. The outer rod (84) is connected to the output end of the drive motor (8). Each of the outer sides of the inner rod (83) is provided with a limiting slide bar (85). The limiting slide bar (85) is slidably connected with the limiting slide groove (86) provided on both sides of the inner side of the outer rod (84).

7. The wastewater recycling and reuse device for iron ore tailings ponds according to claim 1, characterized in that, The microbial incubator (5) is equipped with a drying box (51) for drying sludge. The top of the sludge collection box (33) is open, and the bottom of the sludge collection box (33) is inclined outward from the center of the integrated filter barrel (3). The sludge guide pipe (331) at the end of the sludge collection box (33) passes through the integrated filter barrel (3) and is connected to the drying box (51). A heating box (52) is provided on one side of the drying box (51). A heating rod (53) is provided at the bottom of the heating box (52). A culture medium replenishment box (54) is provided on one side of the heating box (52).

8. A wastewater recycling and reuse device for iron ore tailings ponds according to claim 7, characterized in that, The number of integrated filter tanks (3) is 3 to 8. The side wall of the integrated filter tank (3) is provided with an observation window (39) at the position corresponding to the first filter plate (31) and the second filter plate (32). The chemical tank (4) and the clear water tank (6) are provided with conduits (41), and the microbial incubator (5) and the chemical tank (4) are provided with conduits (41). The guide pipe (21), the overflow pipe (34), the conduit (41), and the mud guide pipe (331) are all provided with solenoid valves (9).

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