A settling tank for desulfurization of complexed iron

Abstract

This invention discloses a settling tank for desulfurization of complexed iron, belonging to the field of complexed iron desulfurization technology. It includes a settling tank body, a rich liquid conveying assembly fixedly installed at the upper edge of the settling tank body, multiple linearly arrayed composite settling cylinders and a dosing assembly located on the upper side of the composite settling cylinders at the center of the upper end of the settling tank body, an overflow port fixedly installed on the upper side of the settling tank body, a drain port fixedly installed on the lower side of the settling tank body, a settling-promoting assembly rotatably installed at the center of the composite settling cylinders, and multiple annularly arrayed arc-shaped guide platforms fixedly installed at the lower end of the composite settling cylinders. Based on the tangential swirling effect during rich liquid conveying, a spiral flow centrifugal force is formed within the composite settling cylinders. Combined with the spatial compression and graded agglomeration synergistic effect brought by the conical structure, efficient separation of particulate matter is achieved. This invention is suitable for the solid-liquid separation process of rich liquid in complexed iron desulfurization.

Description

Technical Field

[0001] This invention relates to the field of desulfurization technology for complexed iron, and more specifically, to a settling tank for desulfurization of complexed iron. Background Technology

[0002] Complexed iron desulfurization technology, as a highly efficient and environmentally friendly gas desulfurization process, is widely used in hydrogen sulfide removal processes in natural gas, petrochemical, coal chemical, and waste incineration industries due to its advantages such as high desulfurization efficiency, fast reaction speed, and recyclable reagents. The core principle of this technology is to use complexed iron ions as an oxidant to hydrogen sulfide in the gas, converting it to elemental sulfur. Simultaneously, the complexed iron ions are reduced to complexed ferrous ions, which are then regenerated back to complexed iron ions through air oxidation, achieving recycling. Throughout the process, solid-liquid separation of the rich solution (containing elemental sulfur, complexed ferrous ions, and other impurities) is a crucial step, directly affecting desulfurization efficiency, reagent consumption, and the stable operation of subsequent processes.

[0003] Currently, commonly used solid-liquid separation equipment in chelated iron desulfurization systems mainly includes settling tanks, centrifuges, and filters. Among these, settling tanks are the most widely used due to their large processing capacity, low operating costs, and simple operation. However, traditional settling tanks generally suffer from low settling efficiency and poor separation effect when treating chelated iron desulfurization solutions. Traditional settling tanks mainly rely on gravity to achieve natural settling of particles. However, the elemental sulfur particles in chelated iron solutions are extremely small, typically at the micrometer level, resulting in slow natural settling and requiring a long residence time for effective separation. This leads to large volumes and large floor spaces in traditional settling tanks, increasing equipment investment costs. Furthermore, the small particles are easily affected by water flow disturbance during natural settling, making it difficult for them to fully aggregate. This results in some small particles being discharged with the overflow, reducing the purification effect of the desulfurization solution and increasing the burden on subsequent regeneration processes. Summary of the Invention

[0004] 1. Technical problems to be solved

[0005] To address the problems existing in the prior art, the present invention aims to provide a settling tank for desulfurization of complexed iron, which achieves efficient separation of particulate matter based on the synergistic effect of spiral flow centrifugal force, spatial compression and graded agglomeration, and is suitable for the solid-liquid separation process of rich liquid in desulfurization of complexed iron.

[0006] 2. Technical Solution

[0007] To solve the above problems, the present invention adopts the following technical solution.

[0008] A settling tank for desulfurization of complexed iron includes a settling tank body, a rich liquid conveying assembly fixedly installed at the upper edge of the settling tank body, a plurality of linearly arrayed composite settling cylinders and a dosing assembly located on the upper side of the composite settling cylinders are arranged at the upper center of the upper end of the settling tank body, an overflow port is fixedly installed on the upper side of the side of the settling tank body, a sludge discharge port is fixedly installed on the lower side of the side of the settling tank body, a settling-promoting assembly is rotatably installed at the center of the composite settling cylinders, and a plurality of annularly arrayed arc-shaped guide platforms are fixedly installed at the lower end of the composite settling cylinders.

[0009] As a further improvement of the present invention, the composite settling cylinder includes a cylindrical part, an outer conical part and an annular outlet part from top to bottom. An inner compression cone is fixedly installed at the upper end of the annular outlet part. A tangential inlet is opened on the side of the cylindrical part. A plurality of annularly arrayed leakage ports are opened on the annular outlet part, and the leakage ports are staggered with the arc-shaped guide platform.

[0010] As a further improvement of the present invention, the rich liquid conveying assembly includes a rich liquid main box, a rich liquid inlet is fixedly installed at the upper end of the rich liquid main box, and a rich liquid tangential branch pipe is fixedly installed between the side of the rich liquid main box and the tangential inlet. The rich liquid is added into the rich liquid main box through the rich liquid inlet, and then after being dispersed, it is conveyed to the composite settling cylinder by multiple rich liquid tangential branch pipes. Due to the tangential conveying, a spiral force is formed in the composite settling cylinder, which in turn drives the settling component to rotate.

[0011] As a further improvement of the present invention, the dosing assembly includes a dosing main pipe, a dosing port is fixedly installed at the upper end of the dosing main pipe, and a dosing branch pipe is fixedly installed between the lower end of the dosing main pipe and the cylindrical part. Flocculant is added through the dosing port, and after being dispersed by the dosing main pipe, it is transported to the composite settling cylinder through multiple dosing branch pipes to promote the flocculation and settling of the rich liquid.

[0012] As a further improvement of the present invention, the sedimentation promoting component includes a rotating shaft rotatably mounted on an inner compression cone, a plurality of rotating impellers arranged in an annular array are fixedly mounted on the upper end of the rotating shaft, and the position of the rotating impellers corresponds to the tangential inlet, and a plurality of stirring blades arranged in an annular array are fixedly mounted on the middle section of the rotating shaft.

[0013] As a further improvement of the present invention, the outer conical section is an inverted conical shape with a larger top and a smaller bottom, and the inner compression conical section is a regular conical shape with a smaller top and a larger bottom. The outer conical section and the inner compression conical section have the same height and form a gradually contracting annular compression space. The cylindrical section, as a flocculation chamber, can improve the flocculation effect through the stirring action of the rotating impeller. The outer conical section, as a coalescence chamber, gradually decreases in size towards the bottom under the cooperation of the inner compression conical section. Combined with the spiral action of the liquid, it forms a strong compression effect on the particles, which promotes the rapid aggregation of small particles to increase their diameter into larger particles, thereby improving the sedimentation efficiency.

[0014] As a further improvement of the present invention, the arc-shaped flow guide platform includes a base, and the upper surface of the base is provided with a flow guide slope, which is inclined downward along the rotation direction of the sedimentation component. The base has multiple agglomeration channels along its length. Relying on the spiral action of the liquid and the guiding effect of the flow guide slope, the liquid carrying particles comes into contact with the end face of the adjacent base. Large particles are blocked due to their large size and then settle downward through the leakage port. Small particles can enter through the agglomeration channels and further agglomerate in a narrower space until they become larger particles that are blocked and settled by the next arc-shaped flow guide platform. In this area, effective classification of particles can be achieved, and most of the small particles are blocked to achieve more effective agglomeration and diameter increase in this area.

[0015] As a further improvement of the present invention, a magnetic scraper assembly is provided on the end face of the base facing the rotation direction of the sedimentation component, and a plurality of circular arrayed dispersing rotating plates are fixedly installed at the lower end of the rotating shaft, and a magnetic substrate is fixedly installed at the upper end of the dispersing rotating plates.

[0016] As a further improvement of the present invention, the magnetic scraper assembly includes a magnetic lifting plate, on the upper end of which a scraper is fixedly installed. Limiting sliders are fixedly installed at both ends of the magnetic lifting plate. A pair of limiting guide rods are fixedly installed on the end face of the base. The limiting sliders are slidably sleeved on the limiting guide rods. After large particles settle down through the drain, they are dispersed by the rotation of the dispersing plate, so that they can be evenly distributed at the bottom of the settling tank. In addition, the magnetic substrate on the dispersing plate will intermittently rotate past each magnetic scraper assembly, applying magnetic repulsion force to the magnetic lifting plate, causing it to overcome water pressure and gravity and move upward. The scraper scrapes the end face of the arc-shaped guide platform to prevent large particles from clogging the agglomeration channel. After the magnetic substrate has rotated past, the magnetic scraper assembly autonomously resets itself by gravity and water pressure.

[0017] As a further improvement of the present invention, the bottom wall of the agglomeration channel is provided with multiple conical through holes extending to the outside. An elastic film is fixedly installed at the upper opening of the conical through hole, and a flexible magnetic sheet is composited on the elastic film. When the magnetic substrate intermittently passes through the conical through hole, a magnetic attraction force is applied to the flexible magnetic sheet on the elastic film, causing it to pull the elastic film to deform synchronously towards the inside of the conical through hole. This applies a suction force to the liquid in the agglomeration channel, causing it to carry small particles into the gradually narrowing conical through hole for compression and agglomeration. After the magnetic substrate passes, the elastic film returns to its original position, and the agglomerated small particles can be discharged. This not only creates multiple active suction actions in the agglomeration channel to promote the agglomeration of small particles during the flow process, but also creates a pulse-like liquid flow. During suction deceleration, the small particles have more time to agglomerate, and during release acceleration, the inner wall of the agglomeration channel can be quickly flushed, avoiding blockage inside the agglomeration channel.

[0018] 3. Beneficial Effects

[0019] Compared with the prior art, the advantages of this invention are:

[0020] (1) This settling tank, through its composite settling cylinder structure design and the tangential entry of the rich liquid, forms a stable spiral flow. Utilizing the synergistic effect of centrifugal force and the annular compression space, it promotes the rapid agglomeration and increase in diameter of fine particles. Simultaneously, the graded agglomeration system constructed by the arc-shaped guide platform enables the orderly settling of particles of different sizes, solving the problem of low efficiency caused by gravity settling in traditional settling tanks. Compared to traditional equipment, this settling tank improves the particle removal rate, increases the rich liquid treatment capacity, significantly shortens the residence time of the rich liquid within the equipment, and enhances the overall processing capacity of the desulfurization system.

[0021] (2) The magnetic scraper assembly set in this invention works in conjunction with the dispersion plate. The magnetic repulsion force drives the scraper to automatically scrape off the attached particles on the end face of the arc-shaped guide platform. At the same time, the pulse action of the elastic film realizes the self-cleaning of the coalescence channel, which fundamentally solves the problem of easy clogging in traditional equipment.

[0022] (3) The settling component of this settling tank is driven to rotate by the impact force of the rich liquid spiral flow, without the need for an additional power source. Compared with the traditional improved settling tank that requires an additional motor to drive the stirring, the energy consumption is significantly reduced, which meets the industrial demand for energy saving and consumption reduction. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention;

[0024] Figure 2 This is a partial cross-sectional view of the present invention;

[0025] Figure 3This is a schematic diagram of the composite settling cylinder of the present invention;

[0026] Figure 4 This is a partial cross-sectional view of the composite settling cylinder of the present invention from a top view.

[0027] Figure 5 This is a partial cross-sectional view of the composite settling cylinder of the present invention from a bottom view.

[0028] Figure 6 This is a schematic diagram of the structure of the annular outlet and the arc-shaped guide platform of the present invention;

[0029] Figure 7 This is a schematic diagram of the arc-shaped flow guide platform of the present invention;

[0030] Figure 8 This is a partial cross-sectional view of the arc-shaped flow guide platform of the present invention;

[0031] Figure 9 For the present invention Figure 8 A schematic diagram of the structure at point A in the middle.

[0032] Explanation of the labels in the diagram:

[0033] 1. Settling tank body; 2. Rich solution conveying assembly; 21. Rich solution main tank; 22. Rich solution inlet; 23. Rich solution tangential branch pipe; 3. Composite settling cylinder; 31. Cylindrical section; 32. Outer conical section; 33. Annular outlet section; 34. Inner compression cone; 35. Tangential inlet; 36. Leakage outlet; 4. Dosing assembly; 41. Dosing main pipe; 42. Dosing port; 43. Dosing branch pipe; 5. Overflow outlet; 6. Drain outlet 7. Sedimentation promoting component; 71. Rotating shaft; 72. Rotating impeller; 73. Stirring blade; 74. Dispersion plate; 75. Magnetic substrate; 8. Arc-shaped guide platform; 81. Base; 82. Guide slope; 83. Coagulation promoting channel; 84. Conical through hole; 85. Elastic film; 86. Flexible magnetic sheet; 9. Magnetic scraper assembly; 91. Magnetic lifting plate; 92. Scraper; 93. Limiting slider; 94. Limiting guide rod. Detailed Implementation

[0034] The following describes some embodiments of this application in detail with reference to the accompanying drawings.

[0035] Example 1:

[0036] Please see Figures 1-7A settling tank for desulfurization of complexed iron includes a settling tank body 1, a rich liquid conveying component 2 fixedly installed at the upper edge of the settling tank body 1, a plurality of linearly arrayed composite settling cylinders 3 and a dosing component 4 located on the upper side of the composite settling cylinders 3 at the upper center of the settling tank body 1, an overflow port 5 fixedly installed on the upper side of the side of the settling tank body 1, a sewage outlet 6 fixedly installed on the lower side of the side of the settling tank body 1, a settling-promoting component 7 rotatably installed at the center of the composite settling cylinders 3, and a plurality of annularly arrayed arc-shaped guide platforms 8 fixedly installed at the lower end of the composite settling cylinders 3.

[0037] The overflow port 5 is made of 316L stainless steel and has a rectangular or circular structure. Its height is higher than the top of the composite settling cylinder 3, ensuring that the rich liquid has sufficient residence time in the settling tank body 1. An internal filter screen is installed in the overflow port 5 to prevent incompletely settled particles from being discharged with the overflow liquid. The filter screen is removable for easy cleaning and replacement. The drain port 6, also made of 316L stainless steel, is fixedly installed on the lower side of the settling tank body 1 and is connected to a drain pipe.

[0038] The composite settling cylinder 3 includes, from top to bottom, a cylindrical part 31, an outer conical part 32, and an annular outlet part 33. An inner compression cone 34 is fixedly installed on the upper end of the annular outlet part 33. A tangential inlet 35 is opened on the side of the cylindrical part 31. A plurality of annularly arrayed leakage ports 36 are opened on the annular outlet part 33, and the leakage ports 36 are staggered with the arc-shaped guide platform 8.

[0039] The rich liquid conveying assembly 2 includes a rich liquid main tank 21, a rich liquid inlet 22 is fixedly installed at the upper end of the rich liquid main tank 21, and a rich liquid tangential branch pipe 23 is fixedly installed between the side of the rich liquid main tank 21 and the tangential inlet 35. The rich liquid is added into the rich liquid main tank 21 through the rich liquid inlet 22, and then after being dispersed, it is conveyed to the composite settling cylinder 3 by multiple rich liquid tangential branch pipes 23. Due to the tangential conveying, a spiral force is formed in the composite settling cylinder 3, which in turn drives the settling component 7 to rotate.

[0040] The dosing assembly 4 includes a dosing main pipe 41, with a dosing port 42 fixedly installed at the upper end of the dosing main pipe 41 and a dosing branch pipe 43 fixedly installed between the lower end of the dosing main pipe 41 and the cylindrical part 31. Flocculant is added through the dosing port 42 and, after being dispersed by the dosing main pipe 41, is transported to the composite settling cylinder 3 through multiple dosing branch pipes 43 to promote the flocculation and settling of the rich liquid.

[0041] The dosing port 42, fixedly installed at the upper end of the main dosing pipe 41, adopts a quick-connect interface design for easy connection with the flocculant delivery pump. It is also equipped with a check valve to prevent backflow of the rich solution into the dosing system. A dosing branch pipe 43, fixedly installed between the lower end of the main dosing pipe 41 and the cylindrical section 31, extends into the interior of the cylindrical section 31 and is equipped with an atomizing nozzle, enabling the flocculant to be evenly sprayed into the rich solution, thereby improving the efficiency of the flocculation reaction.

[0042] The settling component 7 includes a rotating shaft 71 rotatably mounted on the inner compression cone 34. Multiple rotating impellers 72 arranged in an annular array are fixedly mounted on the upper end of the rotating shaft 71, and the position of the rotating impellers 72 corresponds to the tangential inlet 35. Multiple stirring blades 73 arranged in an annular array are fixedly mounted in the middle section of the rotating shaft 71.

[0043] The outer conical section 32 is an inverted conical shape, wider at the top and narrower at the bottom, while the inner compression conical section 34 is a regular conical shape, narrower at the top and wider at the bottom. The outer conical section 32 and the inner compression conical section 34 are at the same height and form a gradually contracting annular compression space. The cylindrical section 31, as a flocculation chamber, can improve the flocculation effect through the stirring action of the rotating impeller 72. The outer conical section 32, as a coalescence chamber, gradually decreases in size towards the bottom with the cooperation of the inner compression conical section 34. Combined with the spiral action of the liquid, it forms a relatively strong compression effect on the particles, which promotes the rapid aggregation of small particles to increase their diameter into larger particles, thereby improving the sedimentation efficiency.

[0044] The composite settling cylinder 3 comprises, from top to bottom, a cylindrical section 31, an outer conical section 32, and an annular outlet section 33. It is integrally molded from fiberglass, a lightweight, high-strength, and highly corrosion-resistant material that can withstand the complex flow patterns and corrosive environment inside the composite settling cylinder 3. The cylindrical section 31 serves as the initial flocculation zone for the rich liquid, providing ample space for the flocculation reaction. The outer conical section 32 is an inverted cone shape, wider at the top and narrower at the bottom. This structure allows the spirally flowing liquid to gradually accelerate downwards, generating stronger centrifugal force. The annular outlet section 33 is an annular structure, serving as the separation outlet area for the liquid and sediment. An inner compression cone 34, fixedly installed at the upper end of the annular outlet section 33, is made of the same fiberglass as the composite settling cylinder 3 and is a regular cone shape, wider at the bottom and narrower at the top. Its cone angle matches that of the outer conical section 32, and both have the same height, forming a gradually contracting annular compression space. This space design is one of the key structural features for achieving particle agglomeration and diameter increase. The tangential inlet 35 on the side of the cylindrical part 31 is precisely connected to the tangential branch pipe 23 for the rich liquid, ensuring the tangential entry direction of the rich liquid; the multiple annular array of leakage outlets 36 on the annular outlet part 33, which are staggered with the arc-shaped guide platform 8, can ensure the orderly discharge of precipitates and avoid dead corners in the discharge.

[0045] The arc-shaped flow guide platform 8 includes a base 81, with a flow guide slope 82 on the upper surface of the base 81. The flow guide slope 82 is inclined downward along the rotation direction of the sedimentation component 7. The base 81 has multiple agglomeration channels 83 along its length. Relying on the spiral action of the liquid and the guiding effect of the flow guide slope 82, the liquid carrying particles comes into contact with the end face of the adjacent base 81. Large particles are blocked due to their large size and then settle downward through the drain port 36. Small particles can enter through the agglomeration channels 83 and further agglomerate in a narrower space until they become larger particles that are blocked and settled by the next arc-shaped flow guide platform 8. In this area, effective classification of particles can be achieved, and most of the small particles are blocked to achieve more effective agglomeration and diameter increase in this area.

[0046] A magnetic scraper assembly 9 is provided on the end face of the base 81 facing the rotation direction of the settling component 7. Multiple circular array-distributed dispersing plates 74 are fixedly installed at the lower end of the rotating shaft 71, and a magnetic substrate 75 is fixedly installed at the upper end of the dispersing plates 74.

[0047] The rotating shaft 71 adopts a stepped shaft structure and is connected to the inner compression cone 34 via bearings. The bearings are made of corrosion-resistant ceramic to ensure rotational flexibility in complex environments. Multiple rotating impellers 72 arranged in a ring array, numbering 3-6, are fixedly installed at the upper end of the rotating shaft 71. These impellers employ an arc-shaped blade structure, with the blade angle matching the spiral flow direction of the rich liquid. When the rich liquid enters the cylindrical section 31 through the tangential inlet 35, it impacts the rotating impellers 72, driving the rotating shaft 71 to rotate without requiring additional power, thus achieving energy savings. Multiple annular array stirring blades 73, with a propeller-like structure, are fixedly installed in the middle section of the rotating shaft 71. Driven by the rotating shaft 71, they rotate to stir the rich liquid and flocculant within the cylindrical section 31, promoting a thorough flocculation reaction and improving the flocculation effect. Multiple annular arrayed dispersing plates 74, rectangular flat structures with anti-slip protrusions, are fixedly installed at the lower end of the rotating shaft 71. During rotation, they disperse the sediment settling from the drain port 36, preventing sediment from clumping and ensuring its uniform distribution at the bottom of the settling tank body 1 for easy subsequent sewage discharge. A magnetic substrate 75, made of neodymium iron boron strong magnetic material, is fixedly installed at the upper end of the dispersing plates 74 and is bolted to the dispersing plates 74. Its magnetic strength can be selected as needed to ensure sufficient repulsive force against the magnetic scraper assembly 9.

[0048] The magnetic scraper assembly 9 includes a magnetic lifting plate 91, with a scraper 92 fixedly installed on the upper end of the magnetic lifting plate 91. Limiting sliders 93 are fixedly installed on both the left and right ends of the magnetic lifting plate 91. A pair of limiting guide rods 94 are fixedly installed on the end face of the base 81. The limiting sliders 93 are slidably sleeved on the limiting guide rods 94. After large particles settle down through the drain port 36, they are dispersed by the rotation of the dispersing plate 74, so that they can be evenly distributed at the bottom of the settling tank body 1. In addition, the magnetic substrate 75 on the dispersing plate 74 will intermittently rotate past each magnetic scraper assembly 9, applying magnetic repulsion force to the magnetic lifting plate 91, causing it to overcome water pressure and gravity and move upward. The scraper 92 scrapes the end face of the arc-shaped guide platform 8, preventing large particles from clogging the agglomeration channel 83. After the magnetic substrate 75 rotates past, the magnetic scraper assembly 9 autonomously resets itself by gravity and water pressure.

[0049] The magnetic lifting plate 91, made of neodymium iron boron magnets, has the same magnetism as the magnetic substrate 75 and can generate a repulsive force. The scraper 92, fixedly mounted on the upper end of the magnetic lifting plate 91, is made of polytetrafluoroethylene (PTFE), possessing good wear resistance and flexibility, and can tightly conform to the end face of the base 81 to effectively scrape off attached particles. Limiting sliders 93, made of brass, are fixedly mounted on both ends of the magnetic lifting plate 91, providing good sliding performance. A pair of limiting guide rods 94, made of 316L stainless steel and polished, are fixedly mounted on the end face of the base 81 to reduce frictional resistance when the limiting sliders 93 slide. The limiting sliders 93 slide on the limiting guide rods 94, ensuring that the magnetic lifting plate 91 can only move up and down along the guide rod direction, preventing deviation.

[0050] Example 2:

[0051] Please see Figure 8 , Figure 9Based on Example 1, the bottom wall of the coalescence channel 83 is provided with multiple tapered through holes 84 extending to the outside. An elastic film 85 is fixedly installed at the upper opening of the tapered through hole 84, and a flexible magnetic sheet 86 is composited on the elastic film 85. When the magnetic substrate 75 intermittently passes through the tapered through hole 84, a magnetic attraction force is applied to the flexible magnetic sheet 86 on the elastic film 85, causing it to pull the elastic film 85 to deform synchronously towards the inside of the tapered through hole 84, thereby applying a suction force to the liquid in the coalescence channel 83, causing it to carry small particles into the gradually flowing liquid. The particles are squeezed and agglomerated in the narrowed tapered through-hole 84, and then the elastic film 85 resets after the magnetic substrate 75 passes through, which can discharge the agglomerated small particles. This not only forms multiple active suction actions in the agglomeration channel 83 to promote the agglomeration of small particles during the flow process, but also forms a pulse-like liquid flow. When the suction is decelerated, the small particles can have more time to agglomerate. When the release is accelerated, the inner wall of the agglomeration channel 83 can be quickly flushed to avoid blockage inside the agglomeration channel 83.

[0052] Multiple tapered through-holes 84 extending to the outside are formed on the bottom wall of the coalescence channel 83. These through-holes have a tapered structure, wider at the top and narrower at the bottom, with a taper of 5-10 degrees, facilitating the entry and exit of particles. An elastic membrane 85, made of fluororubber, is fixedly installed at the upper opening of each tapered through-hole 84. This membrane possesses good elasticity and corrosion resistance and can deform under pressure. A flexible magnetic sheet 86, made of flexible permanent magnet material, is laminated onto the elastic membrane 85. This magnetic material matches the magnetism of the magnetic substrate 75, ensuring that the sheet can deform under the influence of the magnetic substrate 75.

[0053] Working principle:

[0054] First, the rich liquor produced by the complexed iron desulfurization process is transported through pipelines to the rich liquor inlet 22 of the rich liquor conveying assembly 2, and then enters the rich liquor main tank 21. The diversion baffles inside the rich liquor main tank 21 evenly distribute the rich liquor to each rich liquor tangential branch pipe 23. The rich liquor enters the cylindrical section 31 of the composite settling cylinder 3 through the tangential inlet 35 in a tangential direction via the rich liquor tangential branch pipes 23. Due to the tangential entry of the rich liquor, a stable spiral flow is formed within the cylindrical section 31. This spiral flow provides power for subsequent centrifugal settling and also impacts the rotating impeller 72 of the settling assembly 7, driving the rotating shaft 71 and the stirring blades 73 and dispersing plates 74 mounted on the rotating shaft 71 to rotate synchronously, achieving power-free drive and reducing energy consumption.

[0055] Simultaneously, the dosing assembly 4 begins operation. The flocculant enters the main dosing pipe 41 through the dosing port 42, and is then transported to the cylindrical section 31 through various dosing branch pipes 43. The atomizing nozzles at the ends of the dosing branch pipes 43 evenly spray the flocculant into the spirally flowing rich liquid. Under the rotating stirring action of the stirring blades 73 of the sedimentation promoting assembly 7, the flocculant and the rich liquid are thoroughly mixed. Sulfides, suspended solids, and other pollutant particles in the rich liquid gradually form tiny flocs under the action of the flocculant, completing the initial flocculation process.

[0056] The rich liquid carrying tiny flocs, driven by a helical flow, enters the annular compression space formed by the outer conical section 32 and the inner compression cone 34 from the cylindrical section 31. Because the outer conical section 32 is an inverted cone shape (larger at the top and smaller at the bottom), and the inner compression cone 34 is a regular cone shape (smaller at the top and larger at the bottom), this annular space gradually contracts from top to bottom. As the rich liquid flows downwards, its velocity gradually increases, and the centrifugal force generated by the helical motion also intensifies. Under the combined effects of centrifugal force and spatial compression, the tiny flocs collide and aggregate, forming larger particles, thus increasing their diameter and laying the foundation for subsequent sedimentation and separation.

[0057] The rich liquid containing large particles continues to flow downwards, entering the annular outlet 33 region, and contacting the arc-shaped guide platform 8 at the lower end of the composite settling tank 3. The guide slope 82 of the arc-shaped guide platform 8 is inclined downwards along the rotation direction of the settling component 7. Driven by the spiral flow of the rich liquid, the liquid carries the particles along the guide slope 82, causing the particles to contact the end face of the adjacent base 81. Larger particles are blocked by the base 81 and cannot pass through the agglomeration channel 83, and instead settle downwards through the drain 36 on the annular outlet 33, entering the bottom region of the settling tank body 1; while smaller particles can enter the interior of the agglomeration channel 83. This channel is narrow, and the small particles further collide and agglomerate within the channel, achieving secondary diameter increase. As the rich liquid continues to flow, the size of the particles after secondary diameter increase increases, and they are blocked when flowing to the next arc-shaped guide platform 8, and also settle through the drain 36, achieving graded agglomeration and settling of particles, maximizing the separation efficiency of particles.

[0058] During particulate matter settling, the magnetic scraper assembly 9 and the dispersing plate 74 work together to prevent equipment blockage and optimize sediment distribution. As the dispersing plate 74 rotates with the shaft 71, its upper magnetic substrate 75 intermittently passes the position of each magnetic scraper assembly 9. Since the magnetic substrate 75 and the magnetic lifting plate 91 have the same magnetism, a magnetic repulsive force is generated, pushing the magnetic lifting plate 91 to overcome water pressure and its own weight and move upward along the limiting guide rod 94. This causes the scraper 92 to scrape the end face of the arc-shaped guide platform 8, removing the particulate matter attached to the end face and preventing the particulate matter from blocking the agglomeration channel 83. When the magnetic substrate 75 rotates away, the magnetic repulsive force disappears, and the magnetic lifting plate 91 moves downward along the limiting guide rod 94 under its own weight and the upper water pressure, returning to its initial position, completing one scraping action. This process is repeated cyclically with the rotation of the dispersing plate 74, ensuring the smooth flow of the arc-shaped guide platform 8. Meanwhile, during the rotation of the dispersing plate 74, the sediment settling from the drain port 36 is stirred and dispersed to prevent the sediment from clumping at the bottom of the settling tank body 1, thus ensuring its uniform distribution and facilitating subsequent sewage discharge.

[0059] Furthermore, the elastic film 85 and flexible magnetic sheet 86 within the agglomeration channel 83 further enhance the agglomeration effect of small particles. When the magnetic substrate 75 intermittently passes through the conical through-hole 84, the magnetic attraction it generates acts on the flexible magnetic sheet 86 on the elastic film 85, pulling the elastic film 85 to deform inwards towards the conical through-hole 84. This creates a localized negative pressure within the agglomeration channel 83, generating a suction force that draws the liquid and small particles from the channel into the conical through-hole 84. The conical structure of the conical through-hole 84 further compresses the particles, promoting their agglomeration. When the magnetic substrate 75 rotates away, the magnetic attraction disappears, and the elastic film 85 resets under its own elasticity, discharging the agglomerated particles and liquid together and conveying them along the agglomeration channel 83 to the annular outlet 33, completing one suction-agglomeration-discharge process. This process creates a pulsed liquid flow. During the suction deceleration phase, small particles have more time to agglomerate. During the release acceleration phase, the high-speed flowing liquid can flush the inner wall of the agglomeration channel 83, further preventing particles from adhering and clogging.

[0060] After sufficient sedimentation and separation, the clean, rich liquid (i.e., lean liquid) from which particulate matter has been removed gradually rises within the sedimentation tank body 1 and is eventually discharged through the overflow port 5 at the top, entering the subsequent complexed iron regeneration process. Meanwhile, the sediment that settles to the bottom is periodically discharged by technicians through the drain port 6 and enters the solid waste treatment system.

[0061] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A settling tank for desulfurization of complexed iron, comprising a settling tank body (1), characterized in that: A rich liquid conveying assembly (2) is fixedly installed at the upper edge of the settling tank body (1). Multiple linearly arrayed composite settling cylinders (3) and a dosing assembly (4) located on the upper side of the composite settling cylinders (3) are provided at the upper center of the settling tank body (1). An overflow port (5) is fixedly installed on the upper side of the side of the settling tank body (1). A sewage outlet (6) is fixedly installed on the lower side of the side of the settling tank body (1). A settling-promoting assembly (7) is rotatably installed at the center of the composite settling cylinder (3). Multiple annularly arrayed arc-shaped guide platforms (8) are fixedly installed at the lower end of the composite settling cylinder (3). The composite settling cylinder (3) comprises, from top to bottom, a cylindrical section (31), an outer conical section (32), and an annular outlet section (33). An inner compression cone (34) is fixedly installed at the upper end of the annular outlet section (33). A tangential inlet (35) is provided on the side of the cylindrical section (31). Multiple annular arrayed leakage ports (36) are provided on the annular outlet section (33), and the leakage ports (36) are staggered with the arc-shaped guide platform (8). The outer conical section (32) is wider at the top and narrower at the bottom. The inner compression cone (34) is a small inverted cone shape, and the outer cone (32) and the inner compression cone (34) are of the same height and form a gradually shrinking annular extrusion space. The arc-shaped guide platform (8) includes a base (81). The upper end face of the base (81) is provided with a guide slope (82), and the guide slope (82) is inclined downward along the rotation direction of the sedimentation component (7). The base (81) is provided with multiple coalescence channels (83) along the length direction.

2. The settling tank for desulfurization of complexed iron according to claim 1, characterized in that: The rich liquid delivery assembly (2) includes a rich liquid main box (21), a rich liquid inlet (22) is fixedly installed at the upper end of the rich liquid main box (21), and a rich liquid tangential branch pipe (23) is fixedly installed between the side of the rich liquid main box (21) and the tangential inlet (35).

3. A settling tank for desulfurization of complexed iron according to claim 2, characterized in that: The dosing assembly (4) includes a dosing main pipe (41), a dosing port (42) is fixedly installed on the upper end of the dosing main pipe (41), and a dosing branch pipe (43) is fixedly installed between the lower end of the dosing main pipe (41) and the cylindrical part (31).

4. A settling tank for desulfurization of complexed iron according to claim 3, characterized in that: The settling component (7) includes a rotating shaft (71) rotatably mounted on an inner compression cone (34). Multiple rotating impellers (72) arranged in an annular array are fixedly mounted on the upper end of the rotating shaft (71), and the position of the rotating impellers (72) corresponds to the tangential inlet (35). Multiple stirring blades (73) arranged in an annular array are fixedly mounted in the middle section of the rotating shaft (71).

5. A settling tank for desulfurization of complexed iron according to claim 4, characterized in that: A magnetic scraper assembly (9) is provided on the end face of the base (81) facing the rotation direction of the settling component (7). A plurality of circular array-distributed dispersing plates (74) are fixedly installed at the lower end of the rotating shaft (71), and a magnetic substrate (75) is fixedly installed at the upper end of the dispersing plates (74).

6. A settling tank for desulfurization of complexed iron according to claim 5, characterized in that: The magnetic scraper assembly (9) includes a magnetic lifting plate (91), a scraper (92) is fixedly installed on the upper end of the magnetic lifting plate (91), and limit sliders (93) are fixedly installed on both the left and right ends of the magnetic lifting plate (91). A pair of limit guide rods (94) are fixedly installed on the end face of the base (81), and the limit sliders (93) are slidably sleeved on the limit guide rods (94).

7. A settling tank for desulfurization of complexed iron according to claim 6, characterized in that: The bottom wall of the coalescence channel (83) is provided with a plurality of tapered through holes (84) extending to the outside. An elastic film (85) is fixedly installed at the upper opening of the tapered through hole (84), and a flexible magnetic sheet (86) is composited on the elastic film (85).

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