Device for treating iodine-containing wastewater through chemical precipitation method and treatment method thereof

Abstract

The invention relates to the related technical field of wastewater treatment, in particular to a device for treating iodine-containing wastewater through a chemical precipitation method and a treatment method thereof.The device comprises a tower body and further comprises a flow guide part fixedly arranged in the tower body, a guide mechanism is arranged on the flow guide part, and the interior of the tower body is divided into an upper cavity and a lower cavity through the flow guide part; the material distribution mechanism is arranged in the upper cavity and can pre-mix wastewater entering from the top of the tower body with a chemical precipitant, and the pre-mixed wastewater and the chemical precipitant are sequentially diffused and converged along the circumference in the process of passing through the flow guide part; a series of problems caused by inappropriate mechanical stirring strength can be effectively avoided, the selectivity and the conversion rate of the reaction are improved, and the stability and the reliability of the deiodination effect are ensured.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to an apparatus and method for treating iodine-containing wastewater by chemical precipitation. Background Technology

[0002] Iodine-containing wastewater is a special type of industrial wastewater, mainly originating from the nuclear industry, pharmaceutical manufacturing, and chemical production. Iodine is an important chemical element, but when it exists in excess in wastewater, it can cause many hazards. Therefore, it is essential to carry out effective deiodization treatment of iodine-containing wastewater.

[0003] There are many existing methods for iodine removal, such as adsorption, ion exchange, membrane separation, and chemical precipitation. One method involves adding a chemical precipitant to iodine-containing wastewater, causing the iodine in the wastewater to react with the precipitant and form insoluble iodide precipitates, thus separating the iodine from the wastewater. The advantages of chemical precipitation are its relatively simple operation, requiring no complex equipment or cumbersome processes, relatively low treatment costs, and suitability for large-scale wastewater treatment.

[0004] Existing devices for treating iodine-containing wastewater typically include deiodization towers. To enhance the sufficiency of the reaction between iodine in the wastewater and the chemical precipitant, thereby improving the deiodization effect and efficiency, mechanical stirring devices are usually installed. However, the stirring intensity is not easy to control. If the stirring intensity is insufficient, it may be difficult to effectively improve the reaction efficiency. If the stirring intensity is excessive, it may easily cause the precipitate in the tower to float. Floating precipitate will damage the stability of the reaction system. The precipitate that has already been formed will be re-entrained into the reaction liquid, which may interfere with the ongoing chemical precipitation reaction, reduce the selectivity and conversion rate of the reaction, and may lead to local reactions that are too fast or too slow, affecting the stability and reliability of the deiodization effect. Summary of the Invention

[0005] The purpose of this invention is to provide an apparatus and method for treating iodine-containing wastewater by chemical precipitation, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An apparatus for treating iodine-containing wastewater by chemical precipitation includes a tower body and further includes:

[0008] A flow guide is fixedly installed inside the tower body, and the flow guide is provided with a guiding mechanism. The flow guide divides the interior of the tower body into an upper chamber and a lower chamber.

[0009] The material distribution mechanism located in the upper chamber can premix the wastewater entering from the top of the tower with the chemical precipitant. The premixed wastewater and chemical precipitant diffuse and converge along the circumference successively as they pass through the guide member.

[0010] A solid-liquid separation mechanism is provided in the lower chamber. The solid-liquid separation mechanism is used to intercept reaction precipitates and allow the reaction liquid to be discharged through the liquid outlet pipe located at the bottom of the tower.

[0011] The apparatus for treating iodine-containing wastewater by chemical precipitation as described above: a first inlet pipe and a second inlet pipe are fixedly installed at the center and eccentric part of the top of the tower body, respectively. The first inlet pipe is used to supply wastewater into the tower body, and the second inlet pipe is used to supply chemical precipitant into the tower body. The first inlet pipe is connected to the material distribution mechanism.

[0012] The apparatus for treating iodine-containing wastewater by chemical precipitation as described above: the cloth-feeding mechanism includes a rotating pipe that is rotatably and sealed to the first liquid inlet pipe and a rotating component fixed on the rotating pipe, the rotating component being driven to rotate by a drive assembly located inside the tower body;

[0013] The second liquid inlet pipe is located above the rotating component, which is arranged in an inverted umbrella shape. Multiple grooves are provided at equal intervals along its circumference. A gap is provided between the end of the groove facing the rotating pipe and the outer wall of the rotating pipe.

[0014] The apparatus for treating iodine-containing wastewater by chemical precipitation as described above: a shell is fixed to the top of the tower body, and the drive assembly includes a first gear rotatably installed inside the tower body, a second gear fixed to the rotating tube and meshing with the first gear, and a drive motor installed inside the shell, the output end of the drive motor being connected to the rotating shaft of the first gear.

[0015] The apparatus for treating iodine-containing wastewater by chemical precipitation as described above: the flow guide includes a conical part, a cylindrical part, and a connecting part connected together, the conical part, the cylindrical part, and the connecting part being distributed sequentially from top to bottom, and the connecting part being fixed to the inner wall of the tower body.

[0016] The apparatus for treating iodine-containing wastewater by chemical precipitation as described above: a gap is formed between the outer wall of the cylindrical part and the inner wall of the tower body; the guiding mechanism includes a plurality of first annular protrusions fixed on the outer wall of the cylindrical part and a plurality of second annular protrusions fixed on the inner wall of the tower body; the plurality of first annular protrusions and the plurality of second annular protrusions are staggered and located within the gap; and the outer diameter of the first annular protrusion is larger than the inner diameter of the second annular protrusion.

[0017] The connecting part has a parting surface, and the parting surface has a plurality of depressions distributed equidistantly along the circumference. Each depression has a notch, and the notch is connected to the lower chamber through a flow channel provided in the connecting part.

[0018] The apparatus for treating iodine-containing wastewater by chemical precipitation as described above: the solid-liquid separation mechanism includes an assembly ring movably disposed within the tower body and a filter cloth disposed within the assembly ring, and the assembly ring is slidably connected to multiple guide columns evenly distributed along the circumference, the guide columns being fixed to the inner wall of the tower body by protrusions, and the assembly ring being connected to multiple sets of support-type detection structures disposed on the tower body.

[0019] The apparatus for treating iodine-containing wastewater by chemical precipitation as described above: the supporting detection structure includes a guide plate fixed on the tower body and a telescopic plate that slides and fits with the guide plate, and a rolling fit assembly is provided between the telescopic plate and the assembly ring;

[0020] The telescopic plate is fixed with a crossbar that is slidably connected to the telescopic plate. A cylindrical spring connected to the telescopic plate is sleeved on the outer periphery of the crossbar. The end of the cylindrical spring away from the telescopic plate abuts against a pressure sensor located on the upper end of the guide plate.

[0021] The apparatus for treating iodine-containing wastewater by chemical precipitation as described above: the rolling assembly includes a drive wheel installed at the bottom of the assembly ring and a transmission block fixedly installed at one end of the telescopic plate inside the tower body. The side of the transmission block is provided with an inclined surface, and the drive wheel abuts against the inclined surface. When the assembly ring moves down, the drive wheel can cause the transmission block and the telescopic plate to move toward the interior of the guide plate through the inclined surface.

[0022] A method for treating iodine-containing wastewater by chemical precipitation, using the aforementioned apparatus for treating iodine-containing wastewater, includes the following steps:

[0023] Step 1: Wastewater and chemical precipitant are introduced into the upper chamber through the first inlet pipe and the second inlet pipe, respectively;

[0024] Step two: The fabrication mechanism applies the chemical precipitant in a circular motion, distributing it around the columnar wastewater to complete the premixing process.

[0025] Step 3: The premixed wastewater and chemical precipitant are guided by the flow guide and diffused and converged along the circumference before entering the lower chamber.

[0026] Step four: The solid-liquid separation mechanism intercepts the precipitate, and the reaction liquid is discharged through the liquid outlet pipe at the bottom of the tower.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] The wastewater flowing out of the rotating pipe is in the form of a water column, while the chemical precipitant left on the outer wall of the rotating pipe forms an annular film that can envelop the water column formed by the wastewater. Therefore, the initial deployment of wastewater and chemical precipitant can be achieved, providing strong support for the subsequent circumferential diffusion and convergence process.

[0029] When wastewater and chemical precipitant flow onto the conical section, the conical section disperses the wastewater and chemical precipitant, causing them to spread out on the conical section and then enter the gap. As the wastewater and chemical precipitant pass through the gap, under the action of multiple first annular protrusions and multiple second annular protrusions, turbulence is formed within the gap, thereby enhancing the mixing effect. Therefore, it can effectively avoid a series of problems caused by unsuitable mechanical stirring intensity, improve the selectivity and conversion rate of the reaction, and ensure the stability and reliability of the deiodization effect.

[0030] This invention uses a pressure sensor to detect pressure and a rolling assembly to reflect the accumulation of sediment on the filter cloth by measuring the downward movement of the assembly ring during operation. This effectively ensures the efficiency of wastewater treatment while avoiding the problem of filter cloth damage due to excessive sediment accumulation. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of one embodiment of an apparatus for treating iodine-containing wastewater by chemical precipitation.

[0032] Figure 2 This is a schematic diagram of another aspect of an embodiment of an apparatus for treating iodine-containing wastewater by chemical precipitation.

[0033] Figure 3 This is a schematic diagram of another aspect of an embodiment of an apparatus for treating iodine-containing wastewater by chemical precipitation.

[0034] Figure 4 for Figure 3 Enlarged view of the structure at point A in the middle.

[0035] Figure 5 This is a schematic diagram of the internal structure of the tower in one embodiment of an apparatus for treating iodine-containing wastewater by chemical precipitation.

[0036] Figure 6 for Figure 5 The front view.

[0037] Figure 7 for Figure 5 Enlarged view of the structure at point B in the middle.

[0038] Figure 8This is a schematic diagram of the fabric feeding mechanism in one embodiment of an apparatus for treating iodine-containing wastewater by chemical precipitation.

[0039] Figure 9 A half-sectional view of the flow guide element in one embodiment of an apparatus for treating iodine-containing wastewater by chemical precipitation.

[0040] Figure 10 This is a schematic diagram of the solid-liquid separation mechanism in one embodiment of an apparatus for treating iodine-containing wastewater by chemical precipitation.

[0041] Figure 11 An exploded view of the supporting detection structure in one embodiment of an apparatus for treating iodine-containing wastewater by chemical precipitation.

[0042] In the diagram: 1. Tower body; 2. First inlet pipe; 3. Second inlet pipe; 4. Rotating pipe; 5. Drive motor; 6. First gear; 7. Second gear; 8. Rotating component; 801. Groove; 9. Flow guide; 901. Conical part; 902. Cylindrical part; 903. Connecting part; 904. Parting surface; 905. Notch; 10. Flow channel; 11. First annular protrusion; 12. Second annular protrusion; 13. Assembly ring; 14. Filter cloth; 15. Protrusion block; 16. Guide column; 17. Drive wheel; 18. Transmission block; 1801. Inclined surface; 19. Guide plate; 20. Telescopic plate; 21. Crossbar; 22. Columnar spring; 23. Pressure sensor; 24. Outlet pipe; 25. Sealing cap; 26. Booster pump; 27. Shell. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] Furthermore, elements in this invention are referred to as being "fixed to" or "set on" another element, which may be directly on the other element or may also include an intervening element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or may also include an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0045] Please see Figures 1-11 In this embodiment, an apparatus for treating iodine-containing wastewater by chemical precipitation includes a tower body 1, and further includes:

[0046] A flow guide 9 is fixedly installed inside the tower body 1, and the flow guide 9 is provided with a guiding mechanism. The flow guide 9 divides the interior of the tower body 1 into an upper chamber and a lower chamber.

[0047] The material distribution mechanism located in the upper chamber can premix the wastewater entering from the top of the tower 1 with the chemical precipitant. The premixed wastewater and chemical precipitant diffuse and converge along the circumference as they pass through the guide member 9.

[0048] A solid-liquid separation mechanism is provided in the lower chamber. The solid-liquid separation mechanism is used to intercept reaction precipitates and allow the reaction liquid to be discharged through the liquid outlet pipe 24 located at the bottom of the tower body 1.

[0049] In this embodiment, it should be noted that the tower body 1 is made of 316L stainless steel because this material has excellent corrosion resistance and can effectively resist the erosion of chemicals such as iodides in iodine-containing wastewater. At the same time, it has high mechanical strength and can withstand the pressure inside the tower and the impact of water flow, ensuring the long-term stable operation of the equipment.

[0050] As a further embodiment of the present invention, please refer again. Figure 7 and Figure 8 A first inlet pipe 2 and a second inlet pipe 3 are fixedly installed at the top center and eccentric position of the tower body 1, respectively. The first inlet pipe 2 is used to supply wastewater into the tower body 1, and the second inlet pipe 3 is used to supply chemical precipitant into the tower body 1. The first inlet pipe 2 is connected to the material distribution mechanism.

[0051] As a further embodiment of the present invention, the fabric feeding mechanism includes a rotating pipe 4 that is rotatably and sealingly connected to the first liquid inlet pipe 2 and a rotating component 8 fixed on the rotating pipe 4. The rotating component 8 can be driven to rotate by a driving assembly located inside the tower body 1. The second liquid inlet pipe 3 is located above the rotating component 8. The rotating component 8 is arranged in an inverted umbrella shape, and a plurality of grooves 801 are provided at equal intervals along its circumference. A gap is provided between the end of the groove 801 facing the rotating pipe 4 and the outer wall of the rotating pipe 4.

[0052] In this embodiment, when treating iodine-containing wastewater, the wastewater to be treated enters the tower body 1 through the first inlet pipe 2 and the rotating pipe 4. The chemical precipitant enters through the second inlet pipe 3 and falls onto the rotating component 8. At the same time, the driving component drives the rotating component 8 to rotate. The multiple grooves 801 on the rotating component 8 can receive the chemical precipitant and achieve the effect of evenly distributing the chemical precipitant circumferentially during the rotation. Then, the chemical precipitant flows downward along the outer wall of the rotating pipe 4 and meets the wastewater flowing out from the tail end of the rotating pipe 4.

[0053] It should be noted that the wastewater flowing out of the rotating pipe 4 is in the form of a water column, while the chemical precipitant left on the outer wall of the rotating pipe 4 is in the form of an annular film, which can envelop the water column formed by the wastewater. Therefore, the initial layout of wastewater and chemical precipitant can be achieved, providing strong support for the effect of subsequent circumferential diffusion and convergence process.

[0054] As a further embodiment of the present invention, a housing 27 is fixed to the top of the tower body 1, and the driving assembly includes a first gear 6 rotatably installed inside the tower body 1, a second gear 7 fixed to the rotating tube 4 and meshing with the first gear 6, and a driving motor 5 installed inside the housing 27. The output end of the driving motor 5 is connected to the rotating shaft of the first gear 6.

[0055] In this embodiment, during operation, the drive motor 5 operates, driving the first gear 6 to rotate. Thus, the first gear 6 can drive the rotating tube 4 and the rotating component 8 to rotate through the second gear 7. Therefore, the chemical precipitant in the groove 801 can be sprayed around the circumference and evenly distributed around the columnar wastewater before flowing through the guide component 9.

[0056] As a further embodiment of the present invention, please refer again. Figure 5 , Figure 6 as well as Figure 9 The flow guide 9 includes a conical part 901, a cylindrical part 902 and a connecting part 903 connected together. The conical part 901, the cylindrical part 902 and the connecting part 903 are distributed from top to bottom, and the connecting part 903 is fixed to the inner wall of the tower body 1.

[0057] As a further embodiment of the present invention, a gap is formed between the outer wall of the cylindrical portion 902 and the inner wall of the tower body 1. The guiding mechanism includes a plurality of first annular protrusions 11 fixed on the outer wall of the cylindrical portion 902 and a plurality of second annular protrusions 12 fixed on the inner wall of the tower body 1. The plurality of first annular protrusions 11 and the plurality of second annular protrusions 12 are staggered and located within the gap, and the outer diameter of the first annular protrusions 11 is larger than the inner diameter of the second annular protrusions 12. A parting surface 904 is formed on the connecting portion 903. The parting surface 904 is provided with a plurality of depressions distributed equidistantly along the circumference, and each depression is provided with a notch 905. The notch 905 is connected to the lower chamber through a flow channel 10 provided in the connecting portion 903.

[0058] In this embodiment, when the wastewater and chemical precipitant flow onto the conical portion 901, the conical portion 901 can disperse the wastewater and chemical precipitant, causing the wastewater and chemical precipitant to spread on the conical portion 901 and then enter the gap;

[0059] When wastewater and chemical precipitant pass through the gap, under the action of multiple first annular protrusions 11 and multiple second annular protrusions 12, turbulence is formed in the gap, thereby enhancing the mixing effect.

[0060] Subsequently, the wastewater and chemical precipitant enter the lower chamber through the notch 905 and the flow channel 10 for solid-liquid separation treatment.

[0061] It should be noted that a booster pump 26 connected to the upper chamber is also provided on the tower body 1. During operation, the booster pump 26 is used to appropriately increase the pressure in the upper chamber, so that after the wastewater and chemical precipitant flow out of the flow channel 10, the multiple mixed liquid flows can impact each other, thereby further improving the thoroughness of mixing.

[0062] As a further embodiment of the present invention, please refer again. Figure 4 , Figure 10 as well as Figure 11 The solid-liquid separation mechanism includes an assembly ring 13 movably disposed within the tower body 1 and a filter cloth 14 disposed within the assembly ring 13. The assembly ring 13 is slidably connected to a plurality of guide columns 16 distributed equidistantly along the circumference. The guide columns 16 are fixed to the inner wall of the tower body 1 by protrusions 15. The assembly ring 13 is connected to a plurality of sets of support-type detection structures disposed on the tower body 1.

[0063] As a further embodiment of the present invention, the support-type detection structure includes a guide plate 19 fixed on the tower body 1 and a telescopic plate 20 that is slidably fitted with the guide plate 19, wherein a rolling engagement component is provided between the telescopic plate 20 and the assembly ring 13.

[0064] The telescopic plate 20 includes a fixed crossbar 21 slidably connected to it. A cylindrical spring 22 connected to the telescopic plate 20 is sleeved around the outer periphery of the crossbar 21. The end of the cylindrical spring 22 away from the telescopic plate 20 abuts against a pressure sensor 23 located at the upper end of the guide plate 19. The rolling fit assembly includes a drive wheel 17 mounted on the bottom of the assembly ring 13 and a transmission block 18 fixedly mounted on one end of the telescopic plate 20 inside the tower body 1. The side of the transmission block 18 has an inclined surface 1801, and the drive wheel 17 abuts against the inclined surface 1801. When the assembly ring 13 moves downward, the drive wheel 17 can cause the transmission block 18 and the telescopic plate 20 to move toward the interior of the guide plate 19 through the inclined surface 1801.

[0065] In this embodiment, as the tower body 1 runs for longer, the amount of sediment accumulated on the filter cloth 14 gradually increases. Consequently, it becomes more difficult for the reaction liquid to pass smoothly through the filter cloth 14. As a result, the assembly ring 13 will move downward to a certain extent. During this process, the drive wheel 17 acts on the inclined surface 1801, causing the transmission block 18 to drive the telescopic plate 20 to slide towards the inside of the guide plate 19. The compression of the column spring 22 increases, and the pressure value detected by the pressure sensor 23 increases.

[0066] In practical applications, staff can set a preset value for the pressure sensor 23. When this preset value is reached, it indicates that the amount of downward movement of the assembly ring 13 and the filter cloth 14 reflects that the amount of sediment accumulation on the filter cloth 14 is too large, which will affect the smooth interception of sediment.

[0067] Therefore, the present invention detects pressure by setting a pressure sensor 23 and sets a rolling fit component. The degree of downward movement of the assembly ring 13 during operation can reflect the accumulation of sediment on the filter cloth 14, which can effectively ensure the efficiency of wastewater treatment and avoid the problem of filter cloth 14 being damaged due to excessive sediment accumulation.

[0068] It should be noted that the tower body 1 is also provided with an openable and closable sealing cover 25. When the value detected by the pressure sensor 23 reaches the preset value, the process needs to be paused, the sealing cover 25 is opened, and the sediment on the filter cloth 14 is cleaned, or the tower body 1 is equipped with a backflushing function to perform backflushing and cleaning.

[0069] A method for treating iodine-containing wastewater by chemical precipitation, using the aforementioned apparatus for treating iodine-containing wastewater, includes the following steps:

[0070] Step 1: Wastewater and chemical precipitant are introduced into the upper chamber through the first inlet pipe 2 and the second inlet pipe 3, respectively;

[0071] Step two: The fabrication mechanism applies the chemical precipitant in a circular motion, distributing it around the columnar wastewater to complete the premixing process.

[0072] Step 3: The premixed wastewater and chemical precipitant diffuse and converge along the circumference through the guide component 9 and enter the lower chamber.

[0073] Step four: The solid-liquid separation mechanism intercepts the precipitate, and the reaction liquid is discharged through the liquid outlet pipe 24 at the bottom of the tower body 1.

[0074] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0075] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An apparatus for treating iodine-containing wastewater by chemical precipitation, comprising a tower body; Its features are, Also includes: A flow guide is fixedly installed inside the tower body, and the flow guide is provided with a guiding mechanism. The flow guide divides the interior of the tower body into an upper chamber and a lower chamber. The material distribution mechanism located in the upper chamber can premix the wastewater entering from the top of the tower with the chemical precipitant. The premixed wastewater and chemical precipitant diffuse and converge along the circumference successively as they pass through the guide member. A solid-liquid separation mechanism is provided in the lower chamber. The solid-liquid separation mechanism is used to intercept reaction precipitates and allow the reaction liquid to be discharged through the liquid outlet pipe located at the bottom of the tower.

2. The apparatus for treating iodine-containing wastewater by chemical precipitation according to claim 1, characterized in that, A first inlet pipe and a second inlet pipe are fixedly installed at the top center and eccentric position of the tower body, respectively. The first inlet pipe is used to supply wastewater into the tower body, and the second inlet pipe is used to supply chemical precipitant into the tower body. The first inlet pipe is connected to the material distribution mechanism.

3. The apparatus for treating iodine-containing wastewater by chemical precipitation according to claim 2, characterized in that, The fabric feeding mechanism includes a rotating tube that is rotatably and sealed to the first liquid inlet pipe and a rotating component fixed on the rotating tube. The rotating component can be driven to rotate by a drive assembly located inside the tower body. The second liquid inlet pipe is located above the rotating component, which is arranged in an inverted umbrella shape. Multiple grooves are provided at equal intervals along its circumference. A gap is provided between the end of the groove facing the rotating pipe and the outer wall of the rotating pipe.

4. The apparatus for treating iodine-containing wastewater by chemical precipitation according to claim 3, characterized in that, The top of the tower is fixed with a housing. The drive assembly includes a first gear rotatably mounted inside the tower, a second gear fixed to the rotating tube and meshing with the first gear, and a drive motor mounted inside the housing. The output end of the drive motor is connected to the rotating shaft of the first gear.

5. The apparatus for treating iodine-containing wastewater by chemical precipitation according to claim 1, characterized in that, The flow guide includes a conical part, a cylindrical part, and a connecting part connected together. The conical part, the cylindrical part, and the connecting part are distributed sequentially from top to bottom, and the connecting part is fixed to the inner wall of the tower body.

6. The apparatus for treating iodine-containing wastewater by chemical precipitation according to claim 5, characterized in that, A gap is formed between the outer wall of the columnar part and the inner wall of the tower body. The guiding mechanism includes a plurality of first annular protrusions fixed on the outer wall of the columnar part and a plurality of second annular protrusions fixed on the inner wall of the tower body. The plurality of first annular protrusions and the plurality of second annular protrusions are staggered and located within the gap. The outer diameter of the first annular protrusion is larger than the inner diameter of the second annular protrusion. The connecting part has a parting surface, and the parting surface has a plurality of depressions distributed equidistantly along the circumference. Each depression has a notch, and the notch is connected to the lower chamber through a flow channel provided in the connecting part.

7. The apparatus for treating iodine-containing wastewater by chemical precipitation according to claim 1, characterized in that, The solid-liquid separation mechanism includes an assembly ring movably disposed within the tower body and a filter cloth disposed within the assembly ring. The assembly ring is slidably connected to multiple guide columns evenly distributed along the circumference. The guide columns are fixed to the inner wall of the tower body by protrusions. The assembly ring is connected to multiple sets of support-type detection structures disposed on the tower body.

8. The apparatus for treating iodine-containing wastewater by chemical precipitation according to claim 7, characterized in that, The support-type detection structure includes a guide plate fixed to the tower body and a telescopic plate that slides and fits with the guide plate. A rolling fit assembly is provided between the telescopic plate and the assembly ring. The telescopic plate is fixed with a crossbar that is slidably connected to the telescopic plate. A cylindrical spring connected to the telescopic plate is sleeved on the outer periphery of the crossbar. The end of the cylindrical spring away from the telescopic plate abuts against a pressure sensor located on the upper end of the guide plate.

9. The apparatus for treating iodine-containing wastewater by chemical precipitation according to claim 8, characterized in that, The rolling fit assembly includes a drive wheel installed at the bottom of the assembly ring and a transmission block fixedly installed at one end of the telescopic plate inside the tower body. The side of the transmission block is provided with an inclined surface, and the drive wheel abuts against the inclined surface. When the assembly ring moves down, the drive wheel can cause the transmission block and the telescopic plate to move toward the inside of the guide plate through the inclined surface.

10. A method for treating iodine-containing wastewater by chemical precipitation, employing the apparatus for treating iodine-containing wastewater as described in any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Wastewater and chemical precipitant are introduced into the upper chamber through the first inlet pipe and the second inlet pipe, respectively; Step two: The fabrication mechanism applies the chemical precipitant in a circular motion, distributing it around the columnar wastewater to complete the premixing process. Step 3: The premixed wastewater and chemical precipitant are guided by the flow guide and diffused and converged along the circumference before entering the lower chamber. Step four: The solid-liquid separation mechanism intercepts the precipitate, and the reaction liquid is discharged through the liquid outlet pipe at the bottom of the tower.

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