A high-purity quartz sand pickling wastewater fluoride and iron removal advanced treatment device

Abstract

The application relates to the technical field of industrial wastewater treatment equipment, and discloses a high-purity quartz sand acid washing wastewater fluorine and iron removal deep treatment device which comprises, in sequence, a water inlet adjusting bin, a first fluorine removal reaction bin, a steady flow bin, a sedimentation bin, a second fluorine removal reaction bin, a deep fluorine removal reaction bin and a filtered water outlet bin. Buffering flow guide plates and movable supporting plates are arranged in the steady flow bin, the movable supporting plates are connected with hydraulic rods, and filtering liquid discharge ports and flexible telescopic liquid discharge pipes are arranged on the movable supporting plates; the sedimentation bin is divided into two sedimentation areas by a sedimentation sub-baffle, two groups of shunt drainage windows are arranged on the sedimentation sub-baffle, and the shunt drainage windows are switched by moving a blocking plate, and the blocking plate is further connected with a cleaning blocking block. The application can buffer and shunt the water flow entering the sedimentation bin in the continuous wastewater treatment process, and simultaneously clean the filtering liquid discharge position, so that the stability of the wastewater solid-liquid separation process is improved.

Description

Technical Field

[0001] This invention relates to the field of industrial wastewater treatment equipment technology, and in particular to a deep treatment device for defluorination and iron removal of high-purity quartz sand pickling wastewater. Background Technology

[0002] High-purity quartz sand typically requires acid washing during purification to remove impurities such as iron and aluminum adhering to the surface and interior of quartz particles. Acid washing and subsequent water washing processes generate a certain amount of acidic wastewater. This wastewater usually contains high concentrations of fluoride, dissolved iron, and fine quartz particles, characterized by high acidity, complex pollutant composition, and small suspended particle size. Existing treatment methods often employ neutralization, calcium salt precipitation, flocculation sedimentation, and filtration. Specifically, adding lime slurry or other calcium-containing agents causes fluoride ions to form calcium fluoride precipitates, and adjusting the wastewater's pH causes iron ions to form hydroxide precipitates. Combined with flocculation and solid-liquid separation, fluoride and iron removal are achieved. However, in actual continuous treatment, the fine calcium fluoride precipitates formed in the preceding stages easily enter subsequent treatment areas with the water flow and mix with iron-containing precipitates and other suspended solids, leading to increased settling load. Some fine flocs also tend to gradually adhere and accumulate at inclined plates, filter media, and water passages, reducing the effective flow area and causing a decrease in treatment efficiency.

[0003] The above-mentioned and existing related technologies often have the following drawbacks: After calcium salt precipitation and flocculation treatment, existing high-purity quartz sand pickling wastewater treatment devices usually continuously introduce wastewater carrying fine calcium fluoride precipitates, iron-containing precipitates and other flocculents into a fixed settling area. The water flow disturbance caused by continuous water inflow can easily cause the fine flocs that have not yet fully aggregated to disperse, break or resuspend. At the same time, the flocs are also prone to gradually attaching and accumulating at the filter inlet and water passage, causing the settling process to be disturbed by continuous water inflow and the effective flow area to gradually decrease, which in turn leads to a decrease in the stability of solid-liquid separation and continuous treatment efficiency. Summary of the Invention

[0004] The technical problem to be solved by this invention is that the continuous water intake of existing devices easily disturbs the sedimentation of flocs and causes floc accumulation and blockage at the water passage, resulting in a decrease in solid-liquid separation efficiency. To address this, we propose a deep treatment device for defluorination and iron removal of high-purity quartz sand pickling wastewater.

[0005] To achieve the above objectives, this application adopts the following technical solution: a deep treatment device for defluorination and iron removal of high-purity quartz sand pickling wastewater, comprising a wastewater treatment tank and a conveying pump group disposed on one side of the wastewater treatment tank. The wastewater treatment tank includes an outer shell, and inside the outer shell, along the wastewater flow direction, are sequentially arranged an inlet regulating chamber, a primary defluorination reaction chamber, a flow stabilizing chamber, a sedimentation chamber, a secondary defluorination reaction chamber, a deep defluorination reaction chamber, and a filtered effluent chamber. The feature is that: a reaction chamber partition plate is disposed between the primary defluorination reaction chamber and the flow stabilizing chamber, an overflow buffer plate is disposed at the upper end of the reaction chamber partition plate, and a buffer guide plate is rotatably disposed at the lower end of the overflow buffer plate;

[0006] A movable support plate is rotatably installed inside the flow stabilizing chamber. The lower end of the buffer guide plate is slidably connected to the movable support plate. A hydraulic rod that is rotatably connected to the movable support plate is installed inside the flow stabilizing chamber.

[0007] Two sets of filter drain outlets are provided on the side of the movable support plate near the settling chamber. The two sets of filter drain outlets are connected to the settling chamber through flexible telescopic drain pipes.

[0008] A settling diversion baffle is installed between the stabilizing chamber and the settling chamber. The settling diversion baffle is equipped with two sets of diversion drainage windows. A settling compartment baffle is installed inside the settling chamber. The settling compartment baffle divides the settling chamber into two settling areas corresponding to the two sets of diversion drainage windows respectively.

[0009] A movable sealing plate is movably installed on the side of the sedimentation diversion baffle closest to the flow stabilization chamber. The movable sealing plate is fixedly connected to the drive sliding rod. A clearing block that cooperates with the filter drain port is installed on the side of the movable sealing plate closest to the flow stabilization chamber.

[0010] Preferably, the overflow buffer plate is inclined relative to the reaction chamber partition plate, the included angle between the overflow buffer plate and the reaction chamber partition plate is less than 10 degrees, and the upper end of the overflow buffer plate is fixedly connected to both sides of the outer shell.

[0011] Preferably, the inner walls on both sides of the outer shell are respectively provided with first guide grooves, and the two sides of the buffer guide plate are respectively provided with guide parts that cooperate with the first guide grooves, and the guide parts are slidably disposed in the corresponding first guide grooves;

[0012] The upper side of the movable support plate is provided with a second guide groove, and the lower end of the buffer guide plate is slidably disposed in the second guide groove.

[0013] Preferably, a bottom baffle plate is provided at the lower part of the flow stabilizing chamber, and two sets of hydraulic rods are provided. The two sets of hydraulic rods are fixed at intervals at the lower part of the flow stabilizing chamber. The driving end of the hydraulic rod passes through the bottom baffle plate and is rotatably connected to the lower side of the movable support plate. The bottom baffle plate has a downwardly recessed liquid accumulation part, and a drain hole is provided at the low position of the liquid accumulation part. The drain hole is connected to the drain outlet provided at the lower part of the outer shell.

[0014] Preferably, two sets of filter drain outlets are spaced apart on the side of the movable support plate near the settling chamber. Each set of filter drain outlets is equipped with a filter screen, and the lower end of each set of filter drain outlets is connected to a flexible telescopic drain pipe. The flexible telescopic drain pipe is a flexible tube that can bend and extend as the movable support plate rotates.

[0015] Preferably, a servo motor is installed on the upper part of the settling chamber, a lead screw is fixedly connected to the drive end of the servo motor, a drive sliding rod is threaded on the outside of the lead screw, and movable sealing plates are fixedly connected to both ends of the drive sliding rod.

[0016] Multiple sets of limiting rods are fixedly installed on the side of the settling diversion baffle near the flow stabilization chamber. The movable sealing plate is set between the limiting rods and the settling diversion baffle. Limiting blocks for restricting the movement of the movable sealing plate are respectively set at the adjacent positions of the two sets of diversion drainage windows.

[0017] Preferably, a settling buffer plate is fixedly installed below the side of the two sets of diversion drainage windows near the interior of the settling chamber, and the settling buffer plate is inclined relative to the settling diversion baffle.

[0018] The outlet ends of the two sets of flexible telescopic drainage pipes are connected to the corresponding areas of the settling and slowing plates.

[0019] Preferably, a connecting shell is rotatably installed on the side of the movable sealing plate near the flow stabilization chamber. An elastic element is provided inside the connecting shell, and a sliding rod is also slidably provided inside the connecting shell. One end of the elastic element is connected to the connecting shell, and the other end of the elastic element acts on the sliding rod. The end of the sliding rod away from the elastic element extends out of the connecting shell and is rotatably connected to the unblocking block.

[0020] Preferably, the external dimensions of the unblocking block are larger than the opening size of the filter drain port, and a brush is provided at the lower end of the unblocking block, which contacts the filter screen located inside the filter drain port.

[0021] The unblocking block slides relative to the connecting shell via a sliding rod, and rotates with the connecting shell relative to the moving sealing plate.

[0022] Preferably, the upper part of the two settling zones formed by the settling chamber is provided with supernatant overflow areas, and both sets of supernatant overflow areas are connected to the secondary defluorination reaction chamber.

[0023] The bottom of the settling tank is equipped with a sludge discharge area, which has a sludge discharge port connected to a sludge discharge pipeline located outside the wastewater treatment tank.

[0024] The technical effects and advantages of this invention are as follows:

[0025] In this invention, the wastewater after the primary defluorination reaction first passes through an overflow buffer plate and enters the buffer convergence space formed by the buffer guide plate and the movable support plate. This buffers the wastewater before it enters the settling tank, reducing the disturbance of the flocs formed in the preceding stage caused by the direct impact of the water flow. As the hydraulic rod pushes the movable support plate upward, the water-holding space between the buffer guide plate and the movable support plate gradually shrinks, and the upper water is continuously discharged. This causes the fine sediment particles and flocs in the middle and lower parts to gradually concentrate, providing conditions for further contact and aggregation of the flocs. At the same time, the rotation of the movable support plate causes the flexible telescopic drain pipe to gradually unfold, reducing the degree of pipe bending and local flow resistance. This allows the drainage state to be gradually adjusted according to the changes in the buffer convergence space, enabling a natural connection between the initial slow-flow water storage and the subsequent concentrated drainage. The settling chamber is divided into two settling zones by a settling partition. A movable sealing plate switches between the two sets of diversion drainage windows, allowing the two settling zones to alternately handle water intake. When one zone continuously receives water, the other maintains a relatively stable settling state, reducing disturbance to the flocs already in the settling zone from continuous water flow. Before entering the settling zone, the wastewater is buffered by a settling flow buffer plate, further reducing the possibility of floc breakage or resuspension caused by water flow impact. Furthermore, the movable sealing plate simultaneously moves the unblocking block during the switching of the diversion drainage windows, using a brush to clean the filter screen in the filtration outlet, reducing clogging caused by continuous adhesion of flocs and sediment particles. The cooperation between the connecting shell, elastic components, and sliding rods allows the unblocking block to adapt to changes in the position of the movable support plate and flexibly retract. This creates a continuous coordination of wastewater slowing, aggregation, drainage, zoned settling, and filtration cleaning, reducing the impact of water flow disturbance and blockage at the water passage points on solid-liquid separation during continuous treatment and improving the stability of continuous operation of the unit. Attached Figure Description

[0026] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts:

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the internal structure of the wastewater treatment tank of the present invention;

[0029] Figure 3 This is a schematic diagram showing the internal positional relationship between the stabilizing chamber and the settling chamber of the present invention;

[0030] Figure 4 This is a schematic diagram of the connection structure between the stabilizing tank and the settling tank of the present invention;

[0031] Figure 5 This is a schematic diagram of the sedimentation diversion mechanism of the present invention;

[0032] Figure 6 This is a schematic diagram of the internal structure of the flow stabilization chamber of the present invention;

[0033] Figure 7 This is a schematic diagram of the installation structure of the buffer guide plate and the movable support plate of the present invention;

[0034] Figure 8 This is a schematic diagram of the cooperation structure between the unblocking and blocking mechanism and the movable support plate of the present invention;

[0035] Figure 9 This is a schematic diagram of the installation structure of the movable support plate rotation and flexible telescopic drain pipe of the present invention;

[0036] Figure 10 This is a schematic diagram of the installation structure of the settling diversion baffle and the settling flow retardant plate of the present invention.

[0037] Legend: 1. Wastewater treatment tank; 11. Outer shell; 111. First guide chute; 2. Transfer pump set; 3. Inlet regulating chamber; 4. Primary defluorination reaction chamber; 5. Flow stabilizing chamber; 51. Reaction chamber partition plate; 511. Overflow buffer plate; 52. Hydraulic rod; 53. Bottom baffle plate; 531. Drain hole; 54. Buffer guide plate; 55. Movable support plate; 551. Second guide chute; 552. Filter drain port; 553. Flexible telescopic drain pipe; 6. Settling chamber; 61. Servo motor; 62. Lead screw; 63. Drive sliding rod; 631. Moving sealing plate; 64. Settling diversion baffle; 641. Diversion drainage window; 642. Limiting block; 643. Limiting rod; 644. Settling flow buffer plate; 65. Settling compartment baffle; 661. Connecting shell; 662. Elastic element; 663. Sliding rod; 664. Unblocking block; 7. Secondary defluorination reaction chamber; 8. Deep defluorination reaction chamber; 9. Filtered water outlet chamber. Detailed Implementation

[0038] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0039] Reference Figures 1-10 This embodiment provides a deep treatment device for defluorination and iron removal of high-purity quartz sand pickling wastewater, including a wastewater treatment tank 1. A conveying pump group 2 is provided on one side of the wastewater treatment tank 1. The conveying pump group 2 includes multiple conveying pumps and water supply pipelines connected thereto, which are used to convey the high-purity quartz sand pickling wastewater to be treated into the wastewater treatment tank 1.

[0040] The wastewater treatment tank 1 includes an outer shell 11. Inside the outer shell 11, along the wastewater flow direction, there are sequentially arranged an inlet regulating chamber 3, a primary defluorination reaction chamber 4, a flow stabilizing chamber 5, a settling chamber 6, a secondary defluorination reaction chamber 7, a deep defluorination reaction chamber 8, and a filtered effluent chamber 9. Each treatment chamber is separated by a partition and has corresponding connection positions set according to the treatment process, so that the pickling wastewater can pass through the above-mentioned treatment areas in sequence.

[0041] During operation, the pickling wastewater is first transported by the transfer pump unit 2 to the inlet regulating tank 3. The inlet regulating tank 3 temporarily stores and homogenizes the continuously entering pickling wastewater, so that the flow rate, acidity and pollutant concentration of wastewater entering the equipment at different times or in different batches can be regulated to a certain extent, reducing the impact of inlet water fluctuations on the subsequent reagent reaction and sedimentation process.

[0042] After adjustment, the pickling wastewater enters the primary defluorination reaction chamber 4. In this chamber, calcium-containing agents, along with appropriate pH adjusting agents and flocculants, can be added according to the actual water quality. This causes the fluoride ions in the wastewater to react with the calcium ions, forming insoluble fluoride precipitates. For iron ions in the wastewater, pH adjustment and flocculation treatment can be used to form precipitates or flocs that can be retained by subsequent solid-liquid separation processes. Thus, pollutants such as fluoride and iron gradually transform from a dissolved or finely suspended state into easily separable solid particles.

[0043] A reaction chamber partition plate 51 is provided between the primary defluorination reaction chamber 4 and the stabilization chamber 5. An overflow buffer plate 511 is fixedly installed on the upper end of the reaction chamber partition plate 51. The overflow buffer plate 511 is inclined relative to the reaction chamber partition plate 51, and the included angle between the two is less than 90°. After the water level in the primary defluorination reaction chamber 4 rises to the overflow position, the wastewater passes over the upper end of the reaction chamber partition plate 51 and enters the stabilization chamber 5 along the overflow buffer plate 511.

[0044] Because the overflow buffer plate 511 is arranged at an angle, when the wastewater flows from the primary defluorination reaction chamber 4 into the stabilizing chamber 5, it will not fall vertically directly. Instead, it will change its flow direction along the surface of the overflow buffer plate 511 and flow downward. This process can weaken the direct impact of the water flow and reduce the shearing and dispersing effect on the already formed flocs after the high-speed water flow enters the stabilizing chamber 5.

[0045] The upper end of the overflow buffer plate 511 is fixedly connected to both sides of the outer shell 11, and the lower end of the overflow buffer plate 511 is provided with a buffer guide plate 54. The buffer guide plate 54 can rotate relative to the overflow buffer plate 511. The two sides of the buffer guide plate 54 are slidably engaged with the outer shell 11. Specifically, the inner walls of both sides of the outer shell 11 are respectively provided with first guide grooves 111. The guide parts provided on both sides of the buffer guide plate 54 are slidably disposed in the first guide grooves 111. The position of the two sides of the buffer guide plate 54 during the movement is restricted by the first guide grooves 111, so that the buffer guide plate 54 maintains stable movement when pushed by the movable support plate 55, and avoids the plate body from being significantly tilted or stuck.

[0046] The stabilizing chamber 5 is also equipped with a movable support plate 55. One end of the movable support plate 55 is rotatably installed inside the outer casing 11, and its rotatable connection position is located on the side near the settling chamber 6. The movable support plate 55 can rotate up and down within a certain angle range.

[0047] A second guide groove 551 is provided on the upper side of the movable support plate 55, and the lower end of the buffer guide plate 54 is slidably disposed in the second guide groove 551. Thus, a mutually cooperating movable support relationship is formed between the buffer guide plate 54, the movable support plate 55, and the outer shell 11.

[0048] In the initial state, the movable support plate 55 is tilted, and the buffer guide plate 54 is also tilted. The buffer guide plate 54 and the movable support plate 55 form an angle, which encloses a buffer accumulation space that can accommodate wastewater. The wastewater overflowing from the primary defluorination reaction chamber 4 enters the buffer accumulation space after passing through the overflow buffer plate 511, so that the wastewater first accumulates in the stabilizing chamber 5 instead of directly entering the settling chamber 6 behind it.

[0049] Two sets of hydraulic rods 52 are fixedly installed at the lower part of the flow stabilizing chamber 5. The two sets of hydraulic rods 52 are arranged at intervals to form a relatively stable driving force on the movable support plate 55. A bottom baffle plate 53 is also provided at the lower part of the flow stabilizing chamber 5. The driving end of the hydraulic rod 52 passes through the bottom baffle plate 53 and is rotatably connected to the lower side of the movable support plate 55.

[0050] When the hydraulic rod 52 extends, it pushes the movable support plate 55 to rotate upward. At the same time as the movable support plate 55 rotates, the lower end of the buffer guide plate 54 slides relative to the second guide groove 551. The buffer guide plate 54 itself also rotates and is guided and constrained by the first guide groove 111.

[0051] Through the above linkage, the buffer flow space formed between the buffer guide plate 54 and the movable support plate 55 can gradually shrink. Conversely, when the hydraulic rod 52 retracts, the movable support plate 55 resets downwards, and the buffer guide plate 54 unfolds again with the movable support plate 55, thereby forming a larger buffer flow space again, providing a space for the wastewater to enter the stabilizing chamber 5 in the next stage.

[0052] Two sets of filter drain ports 552 are provided on the side of the movable support plate 55 near the settling chamber 6. The two sets of filter drain ports 552 are arranged at intervals. A filter screen is installed in the filter drain port 552 to intercept larger flocs to a certain extent during the wastewater discharge process, so that the water can be discharged through the filter drain port 552, while slowing down the large flocs to pass through the filter drain port 552 directly with the water flow.

[0053] The lower ends of the two sets of filter drain ports 552 are respectively connected to flexible telescopic drain pipes 553. The flexible telescopic drain pipes 553 have a pipe structure that can be bent and telescopic, and their other ends are connected to the sedimentation tank 6.

[0054] When the movable support plate 55 is in its initial tilted position, the flexible telescopic drain pipe 553 maintains a certain bending state along with the position of the movable support plate 55. At this time, there is a large bending resistance and local flow resistance in the pipeline. Therefore, the amount of water flowing into the settling chamber 6 through the filter drain port 552 is limited to a certain extent. As the hydraulic rod 52 pushes the movable support plate 55 to rotate upward, the flexible telescopic drain pipe 553 unfolds accordingly, and its bending degree gradually decreases. The local resistance generated by the wastewater at the bend of the pipeline is reduced accordingly, so the flow capacity of the flexible telescopic drain pipe 553 gradually increases.

[0055] By aligning the flow state of the flexible telescopic drain pipe 553 with the rotation process of the movable support plate 55, a relatively slow drainage state can be maintained when the stabilizing chamber 5 first begins to store water, allowing sufficient time for the contact and aggregation of fine flocs. As the movable support plate 55 gradually rises and the buffer aggregation space gradually shrinks, the bending degree of the flexible telescopic drain pipe 553 decreases accordingly, reducing the local flow resistance of the pipe and allowing the water to be discharged more smoothly into the settling chamber 6. This structure mainly utilizes the change in flow resistance caused by the change in the bending degree of the flexible telescopic drain pipe 553 to regulate the drainage state, rather than relying on the movable support plate 55 to directly squeeze the pipe body and change its internal cross-sectional area.

[0056] The bottom baffle plate 53 is partially designed as a recessed structure to facilitate the collection of liquid, and a drain hole 531 is provided at its low position. The drain hole 531 is connected to the drain structure provided at the lower part of the outer shell 11.

[0057] Since the buffer guide plate 54 and the movable support plate 55 are a movable fit structure, they do not need to be set to a completely sealed state. During the movement, a small amount of water may leak downward from the connection or sliding position between the two. After the leaked water enters the bottom baffle plate 53, it gradually gathers along the concave part of the bottom baffle plate 53 to the drain hole 531, and then is discharged from the drain hole 531. This avoids the small amount of leaked water accumulating near the hydraulic rod 52 for a long time, which would affect the hydraulic rod 52 and its connecting structure.

[0058] A settling diversion baffle 64 is provided between the stabilizing chamber 5 and the settling chamber 6. Two sets of diversion drainage windows 641 are provided on the settling diversion baffle 64, and the two sets of diversion drainage windows 641 are spaced apart in the horizontal direction.

[0059] The settling chamber 6 is equipped with a settling partition 65, which divides the settling chamber 6 into two settling zones, so that the two sets of diversion drainage windows 641 can correspond to different settling zones. In this way, wastewater discharged from the stabilizing chamber 5 can be selectively introduced into different zones of the settling chamber 6 according to the opening status of the diversion drainage windows 641.

[0060] Multiple sets of limiting rods 643 are fixedly installed on the side of the settling and diversion baffle 64 near the flow stabilizing chamber 5. The multiple sets of limiting rods 643 are spaced apart along the moving direction. A servo motor 61 is installed on the upper part of the settling chamber 6. The drive end of the servo motor 61 is connected to a lead screw 62. A drive sliding rod 63 is threadedly connected to the outer side of the lead screw 62.

[0061] The drive sliding rod 63 can move along the axial direction of the lead screw 62 when the servo motor 61 drives the lead screw 62 to rotate. Movable sealing plates 631 are fixedly installed at both ends of the drive sliding rod 63. The movable sealing plate 631 is disposed between the limiting rod 643 and the settling diversion baffle 64. The limiting rod 643 restricts its movement direction, so that the movable sealing plate 631 can move stably along the surface of the settling diversion baffle 64.

[0062] Limiting blocks 642 are also provided near the two sets of diversion drainage windows 641. The limiting blocks 642 are used to limit the extreme movement position of the movable sealing plate 631 to prevent the movable sealing plate 631 from moving excessively and leaving the predetermined sealing area.

[0063] When the servo motor 61 drives the lead screw 62 to rotate in the forward or reverse direction, it drives the sliding rod 63 to move the movable sealing plate 631 to switch positions between the two diversion drainage windows 641. When one diversion drainage window 641 is closed by the movable sealing plate 631, the other diversion drainage window 641 remains open, so that the water in the stabilizing chamber 5 mainly enters the corresponding settling area through the open diversion drainage window 641.

[0064] Therefore, the two settling areas do not need to be subjected to the disturbance caused by continuous water inflow at the same time. When one settling area is in the state of water inflow, the water inflow disturbance to the other settling area is significantly reduced, which can provide a relatively stable settling environment for the flocculent material that has entered it. After a certain period of time, the movable sealing plate 631 switches the diversion drainage window 641 so that the two settling areas take turns to undertake the water inflow task, thereby reducing the continuous disturbance of the settling process caused by continuous water inflow.

[0065] Each of the two sets of diversion drainage windows 641 is fixedly installed with a settling buffer plate 644 on the lower side of the side closest to the interior of the settling chamber 6. The settling buffer plate 644 is set at a small angle relative to the settling diversion baffle 64.

[0066] Wastewater flowing out of the diversion drain 641 first falls onto the surface of the settling buffer plate 644, and then enters the corresponding settling area along the settling buffer plate 644. Since the water flow direction changes again at the settling buffer plate 644, the impact generated when the water flows directly into the settling area can be weakened, reducing the probability of larger flocs breaking due to falling or collision, which is conducive to maintaining a larger particle size of the flocs formed in the early stage.

[0067] The outlet end of the flexible telescopic drain pipe 553 is connected to the area where the sedimentation slow-flow plate 644 is located, so that the water discharged through the filter drain port 552 can also enter the corresponding sedimentation area after passing through the slow flow.

[0068] A connecting shell 661 is rotatably installed on the side of the movable sealing plate 631 near the flow stabilizing chamber 5. An elastic element 662 is provided inside the connecting shell 661, and a sliding rod 663 is also slidably provided inside the connecting shell 661. The elastic element 662 acts on the sliding rod 663, so that the sliding rod 663 can retract into the connecting shell 661 when subjected to external pressure, and reset outward when the pressure decreases.

[0069] A blockage removal block 664 is rotatably mounted on one end of the sliding rod 663 away from the connecting shell 661. The size of the blockage removal block 664 is larger than the size of the filter drain port 552. A brush is provided at the lower end of the blockage removal block 664.

[0070] When the movable support plate 55 is in its initial position, the unblocking block 664 contacts the area where the corresponding filter drain port 552 is located. When the movable support plate 55 rotates upward from its initial position and then returns to its original position downward, the servo motor 61 remains stopped, keeping the drive sliding rod 63 and the moving sealing plate 631 in their current positions without lateral switching. Since the filter drain port 552 changes position synchronously with the movable support plate 55, the sliding rod 663 can slide accordingly inside the connecting shell 661, and the elastic element 662 is compressed or restored accordingly. At the same time, the rotational connection between the connecting shell 661 and the moving sealing plate 631 allows the unblocking block 664 to adapt to the position change of the filter drain port 552, thereby leaving room for the rotation of the movable support plate 55 and avoiding rigid interference between the unblocking block 664 and the movable support plate 55.

[0071] Only after the movable support plate 55 returns to its initial position does the movable sealing plate 631 switch laterally. At this time, the filter drain port 552 returns to the predetermined cleaning position. The servo motor 61 drives the lead screw 62 to rotate, causing the drive sliding rod 63 to move the movable sealing plate 631. The connecting shell 661, the elastic element 662, the sliding rod 663, and the unblocking block 664 move to the other side simultaneously. During the lateral movement, the sliding rod 663 can still overcome the elastic force of the elastic element 662 and slide within a small range in the connecting shell 661, so that the unblocking block 664 remains in elastic contact with the surface where the filter drain port 552 is located.

[0072] During the movement of the unblocking block 664, the brush at its lower end sweeps across the surface of the filter screen inside the filter drain port 552, brushing away the flocs, sediment particles, etc. that are attached to the surface of the filter screen during the filtration process, thereby reducing the possibility of clogging of the filter drain port 552 after long-term use.

[0073] Meanwhile, since the size of the unblocking block 664 is larger than that of the filter drain 552, when it moves to the corresponding position, it can also block the filter drain 552 on that side to a certain extent, thereby reducing or temporarily stopping the drainage capacity of the filter drain 552 on that side. Therefore, while the moving sealing plate 631 blocks the diversion drain window 641 on one side, the filter drain 552 on the corresponding side can be in a blocked and cleaned state, while the filter drain 552 on the other side continues to participate in the drainage.

[0074] During the actual operation, in the initial state, the hydraulic rod 52 is in a retracted state, the movable support plate 55 remains tilted, and a large buffer flow space is formed between the buffer guide plate 54 and the movable support plate 55.

[0075] After the wastewater that has completed the initial reaction in the primary defluorination reaction chamber 4 passes through the reaction chamber partition plate 51, it first flows along the overflow buffer plate 511, and then enters the space between the buffer guide plate 54 and the movable support plate 55. Since the volume of this space is relatively large in the initial state, it can accommodate a certain amount of wastewater, so that the water velocity entering the stabilization chamber 5 gradually decreases.

[0076] As wastewater continues to enter, the water level in the buffer and accumulation space gradually rises. The fine sediment particles and flocs in the wastewater are less disturbed after the water flow velocity decreases, and different particles have more opportunities for contact and collision. Some fine flocs can continue to aggregate to form larger flocs. When the water level gradually reaches the height of the filter drain 552, some water begins to flow through the filter drain 552 on the working side, and then into the settling chamber 6 through the flexible telescopic drain pipe 553.

[0077] At this time, the movable sealing plate 631 closes one of the diversion drainage windows 641, causing the water to flow mainly towards the other open diversion drainage window 641. Under this unilateral flow trend, the flocculent material suspended in the buffer flow space will also gradually migrate and gather towards the open diversion drainage window 641, reducing the disorderly dispersion of flocculent material inside the flow stabilizing chamber 5. When the water volume in the flow stabilizing chamber 5 reaches the set level, the two sets of hydraulic rods 52 extend synchronously, pushing the movable support plate 55 to rotate upward.

[0078] After the movable support plate 55 rotates, the angle between it and the buffer guide plate 54, as well as the effective volume of the space enclosed by the two, gradually changes. The movable support plate 55 pushes the buffer guide plate 54 to move, and the lower end of the buffer guide plate 54 slides along the second guide groove 551, while its two sides move under the restriction of the first guide groove 111.

[0079] As the buffer and flow-gathering space gradually shrinks, the upper water body, after being squeezed, preferentially flows out towards the open diversion drainage window 641 and the filter drainage port 552. At the same time, the flexible telescopic drainage pipe 553 gradually unfolds as the movable support plate 55 rotates, its bending degree decreases, and the local flow resistance of the pipe decreases accordingly, so that the flow capacity of the flexible telescopic drainage pipe 553 gradually increases, thereby enabling the water body at this stage to be discharged more smoothly into the settling chamber 6.

[0080] Because flocs have a certain tendency to settle, larger flocs are mainly concentrated in the middle and lower parts of the buffer and flow space. As the space gradually shrinks and the upper water is continuously discharged, the concentration of flocs in the remaining water gradually increases, and the distance between different flocs shortens, causing some flocs to come into further contact and aggregate.

[0081] Therefore, the movement of the movable support plate 55 and the buffer guide plate 54 does not rely directly on the plate to squeeze the flocs, but rather on changing the water volume and drainage state to gradually concentrate the relatively dispersed flocs in a designated direction and within a smaller area, which is conducive to subsequent sedimentation. When the water carrying the flocs enters the sedimentation chamber 6 through the open diversion drainage window 641, it first passes through the sedimentation slow flow plate 644 for guidance and buffering, which reduces the water flow velocity entering the sedimentation area. Then, solid-liquid separation occurs in the corresponding sedimentation area. The larger flocs gradually settle to the bottom of the sedimentation chamber 6 under their own gravity, and relatively clear water is formed at the top.

[0082] Both sedimentation zones of sedimentation chamber 6 are equipped with supernatant overflow areas at their upper parts. The supernatant overflow areas are connected to the secondary defluorination reaction chamber 7. When wastewater carrying flocculent matter enters the corresponding sedimentation zone, larger fluoride precipitates, iron precipitates, and other flocculent matter gradually settle to the lower part of sedimentation chamber 6, while the water in the upper part gradually forms a relatively clear supernatant. As subsequent wastewater enters, the supernatant flows out through the corresponding overflow position and enters the secondary defluorination reaction chamber 7 for further treatment.

[0083] The bottom of the settling chamber 6 is equipped with a sludge discharge area for collecting sediment. The sludge discharge area is equipped with a sludge discharge port that is connected to the external sludge discharge pipeline. Fluoride precipitates, iron precipitates and other suspended particles formed during settling gradually accumulate at the bottom of the settling chamber 6. After the device has been running for a certain period of time, they can be discharged through the sludge discharge port to reduce the sludge accumulation and its occupation of the effective settling space of the settling chamber 6.

[0084] After a stage of water intake is completed, the hydraulic rod 52 retracts, the movable support plate 55 gradually rotates to the initial tilt position, and the buffer guide plate 54 resets simultaneously, so that a larger buffer and flow-gathering space is formed between the two, thus enabling it to continue to receive wastewater flowing in from the primary defluorination reaction chamber 4.

[0085] After the hydraulic rod 52 has retracted and the movable support plate 55 has fully returned to its initial tilt position, the servo motor 61 starts again and drives the lead screw 62 to rotate, causing the drive sliding rod 63 and the movable sealing plate 631 to move to the other side. At this time, the filter drain port 552 has returned to the predetermined position along with the movable support plate 55. Therefore, the lateral switching of the movable sealing plate 631 will not be carried out simultaneously with the rotation of the movable support plate 55. As the movable sealing plate 631 moves, the previously opened diversion drain window 641 is gradually closed, and the other diversion drain window 641 that was previously closed reopens, thereby switching the wastewater that subsequently enters the settling chamber 6 to another settling area.

[0086] During the switching process, the connecting shell 661, elastic element 662, sliding rod 663, and unblocking block 664 move laterally synchronously with the moving sealing plate 631. The brush at the lower end of the unblocking block 664 passes over the surface of the filter screen inside the filter drain port 552, brushing away the flocs and sediment particles attached to the filter screen. As the moving sealing plate 631 reaches the predetermined position on the other side, the unblocking block 664 corresponds to another set of filter drain ports 552 and forms a blockage on the filter drain port 552 on that side, thereby completing a synchronous switching of the filter drain position, the diversion drain window 641, and the sedimentation inlet area.

[0087] The elastic element 662 enables the unblocking block 664 to maintain a certain elastic fitting pressure, while allowing the sliding rod 663 to generate a certain amount of extension and retraction displacement inside the connecting shell 661. Therefore, whether it is to compensate for the position change of the filter drain port 552 when the movable support plate 55 rotates, or to perform lateral cleaning with the moving sealing plate 631 after the movable support plate 55 is reset, the unblocking block 664 has a certain amount of mobility and is not easily jammed due to rigid pressure.

[0088] After the switch is completed, the filter drain port 552 and the diversion drain window 641 on the other side take on the main drainage function, while the settling area on the side that has just completed the water intake enters a relatively stable settling stage.

[0089] By repeating the above actions on both sides, the stabilizing chamber 5 can form a working process of slow-flow water storage, directional flow guidance, floc aggregation, gradual drainage, volume reduction, and centralized transportation, and the settling chamber 6 can form a working state of alternating water intake and alternating static settling on both sides.

[0090] Compared to wastewater entering a conventional sedimentation tank at high speed directly after reaction, this embodiment can further reduce water flow disturbance before entering the settling chamber 6. By utilizing the combination of the buffer guide plate 54, the movable support plate 55, and the diversion drainage window 641, the water flow direction and spatial volume are actively adjusted, so that the fine flocs formed after the reaction can continue to contact and aggregate.

[0091] Meanwhile, the settling buffer plate 644 can reduce the secondary impact on the flocs when they enter the settling chamber 6 from the stabilizing chamber 5, and reduce the possibility of large flocs that have already formed breaking apart again. The alternating operation of the two sets of settling zones can reduce the disturbance caused by continuous water intake to the entire settling chamber 6, so that the flocs on the non-water intake side have a more stable settling time.

[0092] In addition, through the cooperation between the blockage removal block 664 and the filter drain port 552, the filter screen can be brushed simultaneously during the diversion and switching process, eliminating the need to disassemble and clean the filter screen separately after each shutdown. This reduces the decrease in water flow capacity caused by long-term floc attachment. The supernatant formed at the top of the two settling zones enters the secondary defluorination reaction chamber 7 through its respective supernatant overflow area. In the secondary defluorination reaction chamber 7, the corresponding defluorination agent can be added according to the residual fluoride ion concentration after the previous stage treatment to further remove residual fluoride ions. Subsequently, the water enters the deep defluorination reaction chamber 8, where further chemical reactions or adsorption and flocculation treatment reduce the content of residual fluoride ions and fine suspended solids in the water to improve the overall defluorination depth. The water after deep treatment finally enters the filter outlet chamber 9, where the filtration structure intercepts the small amount of suspended particles and fine flocs that were not completely removed during the aforementioned reaction and settling process. The treated water is then discharged from the filter outlet chamber 9.

[0093] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A deep treatment device for defluoridation and iron removal of high-purity quartz sand pickling wastewater, comprising a wastewater treatment tank and a conveying pump set disposed on one side of the wastewater treatment tank, wherein the wastewater treatment tank comprises an outer shell, and the interior of the outer shell is sequentially arranged along the wastewater flow direction as follows: an inlet regulating chamber, a primary defluoridation reaction chamber, a flow stabilization chamber, a sedimentation chamber, a secondary defluoridation reaction chamber, a deep defluoridation reaction chamber, and a filtered effluent chamber, characterized in that: A reaction chamber partition plate is provided between the primary defluorination reaction chamber and the stabilizing chamber. An overflow buffer plate is provided at the upper end of the reaction chamber partition plate, and a buffer guide plate is rotatably provided at the lower end of the overflow buffer plate. A movable support plate is rotatably installed inside the flow stabilizing chamber, and the lower end of the buffer guide plate is slidably connected to the movable support plate. A hydraulic rod that is rotatably connected to the movable support plate is installed inside the flow stabilizing chamber. The movable support plate is provided with two sets of filter drain outlets on the side near the settling chamber, and the two sets of filter drain outlets are respectively connected to the settling chamber through flexible telescopic drain pipes; A settling diversion baffle is provided between the stabilizing chamber and the settling chamber. The settling diversion baffle is provided with two sets of diversion drainage windows. A settling compartment baffle is provided inside the settling chamber. The settling compartment baffle divides the settling chamber into two settling areas corresponding to the two sets of diversion drainage windows respectively. A movable sealing plate is movably installed on the side of the sedimentation diversion baffle near the flow stabilization chamber. The movable sealing plate is fixedly connected to the drive sliding rod. A clearing block that cooperates with the filter drain port is provided on the side of the movable sealing plate near the flow stabilization chamber.

2. The advanced treatment device for defluorination and iron removal of high-purity quartz sand pickling wastewater according to claim 1, characterized in that: The overflow buffer plate is inclined relative to the reaction chamber partition plate, and the included angle between the overflow buffer plate and the reaction chamber partition plate is less than 90°. The upper end of the overflow buffer plate is fixedly connected to both sides of the outer shell.

3. The advanced treatment device for defluorination and iron removal of high-purity quartz sand pickling wastewater according to claim 2, characterized in that: The inner walls on both sides of the outer shell are respectively provided with first guide grooves, and the two sides of the buffer guide plate are respectively provided with guide parts that cooperate with the first guide grooves. The guide parts are slidably disposed in the corresponding first guide grooves. The upper side of the movable support plate is provided with a second guide groove, and the lower end of the buffer guide plate is slidably disposed in the second guide groove.

4. The advanced treatment device for defluorination and iron removal of high-purity quartz sand pickling wastewater according to claim 3, characterized in that: The lower part of the flow stabilizing chamber is provided with a bottom baffle plate. Two sets of hydraulic rods are provided, and the two sets of hydraulic rods are fixed at intervals to the lower part of the flow stabilizing chamber. The driving end of the hydraulic rod passes through the bottom baffle plate and is rotatably connected to the lower side of the movable support plate. The bottom baffle plate has a downwardly recessed liquid accumulation part, and a drain hole is opened at the low position of the liquid accumulation part. The drain hole is connected to the drain outlet provided at the lower part of the outer shell.

5. The advanced treatment device for defluorination and iron removal of high-purity quartz sand pickling wastewater according to claim 4, characterized in that: Two sets of filter drain outlets are spaced apart on the side of the movable support plate near the settling chamber. Each set of filter drain outlets is equipped with a filter screen. The lower end of each set of filter drain outlets is connected to the flexible telescopic drain pipe, which is a flexible tube that can bend and extend as the movable support plate rotates.

6. The advanced treatment device for defluorination and iron removal of high-purity quartz sand pickling wastewater according to claim 5, characterized in that: A servo motor is installed on the upper part of the settling chamber. A lead screw is fixedly connected to the drive end of the servo motor. The drive sliding rod is threaded onto the outside of the lead screw. The movable sealing plate is fixedly connected to both ends of the drive sliding rod. Multiple sets of limiting rods are fixedly installed on the side of the settling diversion baffle near the flow stabilization chamber. The movable sealing plate is disposed between the limiting rods and the settling diversion baffle. Limiting blocks for restricting the movement of the movable sealing plate are respectively disposed at the adjacent positions of the two sets of diversion drainage windows.

7. The advanced treatment device for defluorination and iron removal of high-purity quartz sand pickling wastewater according to claim 6, characterized in that: Settling buffer plates are fixedly installed below the two sets of diversion drainage windows on the side closest to the interior of the settling chamber, and the settling buffer plates are inclined relative to the settling diversion partition. The outlet ends of the two sets of flexible telescopic drainage pipes are respectively connected to the area where the corresponding sedimentation and flow-retarding plate is located.

8. The advanced treatment device for defluorination and iron removal of high-purity quartz sand pickling wastewater according to claim 6, characterized in that: The movable sealing plate is rotatably mounted with a connecting shell on the side near the flow stabilization chamber. An elastic element is provided inside the connecting shell, and a sliding rod is also slidably provided inside the connecting shell. One end of the elastic element is connected to the connecting shell, and the other end of the elastic element acts on the sliding rod. The end of the sliding rod away from the elastic element extends out of the connecting shell and is rotatably connected to the unblocking block.

9. The advanced treatment device for defluorination and iron removal of high-purity quartz sand pickling wastewater according to claim 8, characterized in that: The external dimensions of the unblocking block are larger than the opening size of the filter drain port. A brush is provided at the lower end of the unblocking block, and the brush is in contact with the filter screen provided in the filter drain port. The unblocking block slides relative to the connecting shell via the sliding rod, and rotates with the connecting shell relative to the movable sealing plate.

10. The advanced treatment device for defluorination and iron removal of high-purity quartz sand pickling wastewater according to claim 7, characterized in that: The upper part of the two sedimentation zones formed by the sedimentation chamber is provided with supernatant overflow areas, and both sets of supernatant overflow areas are connected to the secondary defluorination reaction chamber. The bottom of the settling chamber is provided with a sludge discharge area, which is provided with a sludge discharge port, and the sludge discharge port is connected to a sludge discharge pipeline located outside the wastewater treatment tank.

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