An extraction system

Abstract

This application discloses an extraction system, including a rare earth dissolution tower for transferring rare earth elements into a solution; several extraction tanks for transferring rare earth elements from the solution to different phases, each equipped with several inlets, outlets, and actuators to drive liquid rotation. The outlets are located near the top of the extraction tanks, and the inlets are located near the bottom. The actuators drive the liquid to rotate at different speeds, forming a rotation speed gradient; and a clarification tank for separating the extracted liquid into layers. This application achieves breakthrough advantages in suppressing emulsification, improving mass transfer efficiency, and enhancing operational stability through a coordinated design of rotation speed gradient, flow field optimization, and gas pressure. It is particularly suitable for the industrial separation of high-fluorine and high-radioactivity rare earth systems, providing an innovative solution for green and efficient rare earth smelting.

Description

Technical Field

[0001] This application relates to the technical field of extraction of metal elements from rare earth elements, and in particular to an extraction system. Background Technology

[0002] Rare earth elements are the lanthanide elements in the periodic table—lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), and lutetium (Lu), as well as two elements closely related to the 15 lanthanide elements—scandium (Sc) and yttrium (Y), totaling 17 elements. They are called rare earth elements, or simply rare earth (RE or R).

[0003] Solvent extraction is suitable for the mass production of rare earth elements with high abundance, from lanthanum to erbium and yttrium. Solvent extraction separation refers to adding an organic solvent that is immiscible with water to an aqueous solution of the substances to be separated. With the help of the extractant, one or more components enter the organic phase, while other components remain in the aqueous phase, thereby achieving the purpose of separation.

[0004] An existing rare earth element extraction system involves suspending a measured amount of rare earth element in an extraction tank, then introducing a measured amount of solvent from the top of the tank. The system is then heated and stirred to ensure thorough mixing of the feed liquid and solvent. After mixing, the mixture is transferred to a clarification tank for static stratification. While stirring promotes more uniform dispersion of the liquid phases and forms fine droplets, it can also lead to emulsification. Emulsification not only reduces extraction efficiency but also increases the difficulty of subsequent separation steps. Therefore, there is an urgent need for an extraction system that not only ensures more uniform dispersion and mixing of the liquid phases but also minimizes the occurrence of emulsification. Summary of the Invention

[0005] The purpose of this application is to provide an extraction system that improves solution mixing and prevents emulsification.

[0006] The extraction system provided in this application adopts the following technical solution: a rare earth dissolution tower, used to transfer rare earth elements into a solution;

[0007] Several extraction tanks are used to transfer rare earth elements in a solution to different phases. They are equipped with several liquid inlets, liquid outlets, and actuators to drive the liquid to rotate. The liquid outlets are near the top of the extraction tanks, the liquid inlets are near the bottom of the extraction tanks, and the actuators can drive the liquid to rotate at different speeds to form a rotation speed gradient.

[0008] Clarification tank, used to separate the extracted liquid into layers;

[0009] By employing the above technical solution, rare earth elements are transferred into a solution via a rare earth dissolution tower. The solution then enters several extraction tanks for phase transfer. Each extraction tank is equipped with an inlet, an outlet, and a liquid rotation actuator. By driving the liquid to rotate at different speeds to create a velocity gradient, uniform dispersion and mixing of the liquid phases are achieved, while avoiding emulsification caused by vigorous stirring. The separated liquids then enter a clarification tank for final separation. This design effectively reduces the risk of emulsification while ensuring effective mixing, and improves extraction efficiency and separation quality.

[0010] Optionally, when the number of extraction tanks is greater than or equal to 2, the extraction tanks are connected in series, and the rotation speed of the liquid inside the extraction tanks increases sequentially along the liquid flow direction.

[0011] By employing the above technical solution, larger droplets can form first in the low-speed stage. As the speed is gradually increased, these droplets are more likely to collide and merge (rather than break up further), thus reducing the risk of emulsification. Multiple sequentially connected extraction tanks are used, and a liquid rotation actuator creates a controllable velocity gradient within the tank, gradually increasing the rotational speed along the flow direction. This progressive acceleration design promotes thorough mixing of the feed liquid and solvent while avoiding emulsification caused by vigorous stirring, and simultaneously enhances mass transfer efficiency through velocity differences. The extracted mixture enters a clarification tank for natural stratification, achieving efficient separation. This solution significantly reduces the risk of emulsification while ensuring extraction effectiveness, and improves the separation purity and process stability of rare earth elements.

[0012] Optionally, the execution component includes a stirring shaft, a spiral blade fixedly connected to the stirring shaft, and a flow control plate installed on the inner wall of the extraction tank. The flow control plate is perpendicular to the direction of liquid rotation, and the spiral blade is disposed between the liquid inlet and the spiral blade.

[0013] By employing the above technical solution, the stirring shaft drives the spiral blades to rotate, which, in conjunction with the flow control plate installed on the inner wall of the extraction tank, achieves precise control of the liquid flow. The spiral blades are located between the inlet and the flow control plate. While driving the liquid to rotate, the flow control plate creates a velocity gradient by hindering the liquid flow, ensuring thorough contact and mixing between the feed liquid and the solvent. This design avoids the emulsification problems easily caused by traditional stirring methods, and the synergistic effect of the spiral blades' conveying action and the flow control plate's guiding action enhances mass transfer efficiency, enabling more stable transfer of rare earth elements between the two phases. This structure effectively reduces the risk of emulsification while ensuring mixing uniformity and improving the extraction and separation effect.

[0014] Optionally, when the number of extraction tanks is 1, the extraction tank includes several cylinders of different sizes, nested in order of size, and the execution component drives the cylinders of different sizes to rotate at different speeds. The rotation speed of the cylinders increases gradually from the outside to the inside, the rotation directions of two adjacent cylinders are opposite, and the area between adjacent cylinders is the extraction zone.

[0015] By employing the above technical solution, a multi-layered nested cylinder design achieves differentiated rotation speeds and reverse rotation for efficient extraction. Cylinders of different sizes rotate at progressively faster speeds from the outside in, with adjacent cylinders rotating in opposite directions, creating a shear force field and velocity gradient between them. This structure generates strong relative motion between the feed liquid and solvent within the extraction zone, ensuring thorough mixing and contact while avoiding emulsification problems caused by traditional stirring through ordered fluid movement. The reverse-rotating cylinders create vortices in adjacent areas, enhancing the mass transfer process, while the layered velocity gradient facilitates the selective transfer of rare earth elements. This design achieves multi-stage mixing within a single extraction tank, significantly improving extraction efficiency and reducing the risk of emulsification.

[0016] Optionally, the extraction tank also includes a mounting frame and an end cap. The outermost cylinder is mounted on the mounting frame and is rotatably connected to a ring. The liquid inlet is located on the ring. The end cap can seal the top of the outermost cylinder and is detachably connected to the mounting frame.

[0017] By adopting the above technical solution, the mounting frame and detachable end caps enable stable assembly and convenient maintenance of the multi-layer cylinder. The outermost cylinder is rotatably connected to the mounting frame via a ring, with the liquid inlet integrated into the ring to ensure uniform liquid introduction. The end caps feature a detachable design, which not only seals the top of the extraction tank to prevent leakage but also facilitates equipment maintenance and cylinder replacement. This structure, while ensuring the independent rotational accuracy of the multi-layer cylinders, enhances the overall sealing and operational convenience of the equipment, enabling the long-term stable operation of the reverse rotation extraction system with velocity gradients. This modular design not only meets the requirements of complex fluid control but also improves the maintainability of the equipment, providing reliable hardware support for the efficient extraction of rare earth elements.

[0018] Optionally, the end cap is provided with a connection point for an external air pump, a pressure gauge, and at least one ring body fixedly connected thereto. The ring body can extend into the extraction zone and has a balance hole through it.

[0019] By adopting the above technical solution, an external air pump and pressure gauge can be used to achieve precise control of the air pressure inside the extraction tank, thereby optimizing the mass transfer environment.

[0020] Optionally, the ring body divides the extraction zone into two flow zones with different rotation directions. Several flow control plates are fixedly connected to the inner wall of the ring body. The flow control plates are arranged at an angle, with the angle tilting downwards along the rotation of the liquid.

[0021] By employing the above technical solution, the extraction zone is divided into two flow regions with different rotation directions. The inclined flow control plate on the inner wall of the ring is tilted downward along the direction of liquid rotation, forming a guiding effect. This guides the fluid to generate downward axial movement, enhancing the axial mixing of the fluid and promoting the mass transfer efficiency of rare earth elements between the two phases. This allows the extraction process to maintain high separation selectivity while achieving more stable operation control.

[0022] Optionally, the extraction zone is provided with a guide ring, which is located on the outer side of the cylinder. The guide ring and the ring body are respectively located in different extraction zones, and the guide ring is located on a slope surface.

[0023] By adopting the above technical solution, a guide ring with a sloping surface is added to the extraction zone, forming a zoned collaborative control structure with the end cap ring. The guide ring is installed on the outer cylinder, and its sloping surface design effectively regulates the fluid flow direction, complementing the flow control plate of the ring. This zoned flow field control mechanism creates a more orderly fluid movement pattern within the extraction zone: the guide ring primarily optimizes the flow pattern in the outer high-speed rotating zone, while the ring stabilizes the interface in the inner reverse flow zone. The angle design of the sloping surface promotes full contact between the two phases, improving mass transfer efficiency while avoiding emulsification. This structure, through layered flow field control, achieves a balance between mixing intensity and separation effect during rare earth extraction, enabling a single-stage extraction system to achieve separation performance close to that of a multi-stage series system.

[0024] Optionally, the execution component includes a power source and a power shaft connected to the output end of the power source, the power shaft being connected to the cylinder via gears.

[0025] By adopting the above technical solution, the rotation of different cylinders can be achieved, and by controlling different speed ratios, the differential speed of liquid rotation in different extraction zones can be realized.

[0026] Optionally, the clarification tank includes a box body with a partition that divides the interior into a first zone and a second zone. The first zone is connected to at least one feed pipe, and the second zone is connected to at least one discharge pipe. The first zone and the second zone are connected. At least one diversion plate is disposed at the connection between the first zone and the second zone and has at least two guide arcs. A diversion zone is formed between adjacent diversion plates and between the diversion plate and the box body. The guide arcs are respectively close to the inlet and outlet positions of the diversion zone.

[0027] By adopting the above technical solutions, the guide arc design at the inlet helps to eliminate sharp-angle vortices when water enters, forming the Coanda effect to guide the fluid to flow along the wall, avoiding central jets and reducing interface disturbances. The guide arc design at the outlet prevents secondary vortices caused by boundary layer separation, reducing turbulence. The double guide arcs form a notch, effectively extending the kinetic energy absorption drive and reducing the water flow velocity at the outlet of the diversion zone.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] 1. The extraction system optimizes the liquid-liquid mixing process through staged rotation speed control, significantly reducing the risk of emulsification. The series-connected extraction tanks employ a stepped stirring strategy of low speed → medium speed → high speed: the low-speed stage forms large droplets, reducing initial shear force; the medium-speed stage enhances mass transfer; and the high-speed stage completes efficient extraction in a short run. A complex flow field is created by the counter-rotating nested cylinders, promoting droplet collision and merging rather than breakup.

[0030] 2. A dynamic gas pressure regulation system is introduced. By setting a pressure zone at the top of the extraction tank, the two-phase interface is compressed, the diffusion distance is shortened, and the mass transfer rate is improved. This suppresses the precipitation of dissolved gases, reduces the stabilizing effect of bubbles on emulsification, assists in demulsification, and makes droplets more likely to coalesce under high pressure, significantly shortening the settling and stratification time.

[0031] 3. The extraction system, through a coordinated design of rotation speed gradient, flow field optimization, and gas pressure, offers breakthrough advantages in suppressing emulsification, improving mass transfer efficiency, and enhancing operational stability. It is particularly suitable for the industrial separation of high-fluorine and high-radioactivity rare earth systems, providing an innovative solution for green and efficient rare earth smelting. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application;

[0033] Figure 2 This is a schematic diagram of the overall structure of the extraction tank in Embodiment 1 of this application;

[0034] Figure 3 This is a schematic diagram of the overall structure of the clarification tank in Embodiment 1 of this application;

[0035] Figure 4 This application Figure 3 Top view;

[0036] Figure 5 This is a schematic diagram of the overall structure of the extraction tank in Embodiment 2 of this application;

[0037] Figure 6 This is a schematic diagram of the overall structure of the execution component in Embodiment 2 of this application;

[0038] Figure 7 This is a cross-sectional view of the extraction tank in Embodiment 2 of this application;

[0039] Figure 8 This is a schematic diagram of the overall structure of the large cylinder in Embodiment 2 of this application;

[0040] Figure 9 This is a schematic diagram of the overall structure of the end cap in Embodiment 2 of this application;

[0041] Figure 10 This is a cross-sectional view of the end cap of Embodiment 2 of this application.

[0042] Explanation of reference numerals in the attached drawings: 1. Rare earth dissolving tower; 2. Extraction tank; 21. Outlet; 22. Inlet; 23. Actuating component; 231. Flow control plate; 232. Stirring shaft; 233. Spiral blade; 234. Gear ring; 235. Limiting block; 236. Connecting shaft; 237. Power shaft; 24. Mounting bracket; 25. Cylinder; 251. Large cylinder; 2511. Opening; 252. Middle cylinder; 253. Small cylinder; 254. First mixing zone; 255. Second mixing zone; 256. Third mixing zone; 257. Stepped through hole; 26. End cap; 261. Connection part; 262. Pressure gauge; 263. Ring body; 264. Balance hole; 265. Pressure zone; 27. Ring sleeve; 28. Guide ring; 281. Sloping surface; 3. Clarifying tank; 31. Discharge pipe; 32. Inlet pipe; 33. Baffle; 34. Second zone; 35. First zone; 36. Diverter plate; 37. Guide arc. Detailed Implementation

[0043] The following is in conjunction with the appendix Figure 1 - Appendix Figure 10 This application will be described in further detail.

[0044] This application discloses an extraction system.

[0045] Example 1, referring to Figure 1 An extraction system includes a rare earth dissolving tower 1, three extraction tanks 2, and a clarification tank 3. The extraction tanks 2 are respectively located at the inlet 22 and the outlet 21. The outlet 21 is close to the top of the extraction tank 2, and the inlet 22 is close to the bottom of the extraction tank 2. The two extraction tanks 2 are connected in series. The solution passes through the rare earth dissolving tower 1, the extraction tanks 2 and the clarification tank 3 in sequence. The liquid flow rates in the two extraction tanks 2 are different.

[0046] refer to Figure 2 The execution component 23 includes a stirring shaft 232, a spiral blade 233 fixedly connected to the stirring shaft 232, and a flow control plate 231 installed on the inner wall of the extraction tank 2. The flow control plate 231 is perpendicular to the direction of liquid rotation. The spiral blade 233 is disposed between the liquid inlet 22 and the spiral blade 233. Each extraction tank 2 is equipped with a motor, and the output end of the motor is connected to the stirring shaft 232. The speed of the motor in each extraction tank 2 makes the rotation speed of the liquid in the extraction tank 2 different.

[0047] The first extraction tank 2 rotates at a low speed of 100-300 rpm to initially mix the two phases and form larger droplets; the second extraction tank 2 rotates at 500-800 rpm to promote mass transfer but avoid excessive shearing; above 1000 rpm, it only runs briefly to complete the extraction. The low speed stage allows larger droplets to form first, and as the speed is gradually increased, these droplets may be more inclined to collide and merge (rather than break down further), thereby reducing the risk of emulsification.

[0048] refer to Figure 3 and Figure 4 The clarifier 3 includes a tank body with a partition 33 dividing the interior into a first zone 35 and a second zone 34. The first zone 35 is connected to an inlet pipe 32, and the second zone 34 is connected to two outlet pipes 31. The first zone 35 and the second zone 34 are interconnected. Three flow dividers 36 are located at the connection between the first zone 35 and the second zone 34. Two guide arcs 37 form flow dividers between adjacent flow dividers 36 and between the flow dividers 36 and the tank body. The guide arcs 37 are located near the inlet and outlet of the flow dividers. The design of the guide arc 37 at the inlet helps to eliminate sharp-angle vortices when water enters, forming a Coanda effect to guide the fluid to flow along the wall, avoiding central jets and reducing interface disturbance. The design of the guide arc 37 at the outlet prevents secondary vortices caused by boundary layer separation and reduces turbulence. The double guide arcs 37 form a notch, effectively extending the kinetic energy absorption drive and reducing the water flow velocity at the outlet of the flow divider.

[0049] Example 2, Reference Figure 5 , Figure 6 and Figure 7 Unlike Example 1, when the number of extraction tanks 2 is one, the extraction tank 2 includes several cylinders 25 of different sizes, nested sequentially according to size. The execution component 23 drives the cylinders 25 of different sizes to rotate at different speeds, with the rotation speed of the cylinders 25 gradually increasing from the outside to the inside. Adjacent cylinders 25 rotate in opposite directions, and the area between adjacent cylinders 25 is the extraction zone. In Example 2, the number of cylinders 25 is three, which are named according to size as large cylinder 251, medium cylinder 252, and small cylinder 253 for ease of description. The bottom ends of the large cylinder 251 and medium cylinder 252 are located at stepped through holes 257, and the cylinders 25 are installed at the stepped through holes 257, allowing relative rotation between the cylinders 25. The bottom ends of the medium cylinder 252 and small cylinder 253 are fixedly connected to limiting blocks 235. The limiting blocks 235 cooperate with the stepped through holes 257 to restrict the movement of the cylinders 25, allowing the cylinders 25 to maintain rotation while preventing them from detaching.

[0050] refer to Figure 5 , Figure 6 and Figure 7The bottom ends of the large cylinder 251, the middle cylinder 252, and the small cylinder 253 are all provided with gear rings 234. The actuating component 23 includes a connecting shaft 236, which is connected to the gear ring 234 by gears. The transmission ratio between the large cylinder 251 and the connecting shaft 236, the middle cylinder 252 and the connecting shaft 236, and the small cylinder 253 and the connecting shaft 236 increases sequentially. The rotational speed of the small cylinder 253 is greater than that of the middle cylinder 252, which is greater than that of the large cylinder 251. The rotational directions of the large cylinder 251 and the small cylinder 253 are positive, while the rotational direction of the middle cylinder 252 is negative.

[0051] refer to Figure 7 and Figure 8 In Example 2, the extraction area is divided into three main zones, which are named the first mixing zone 254, the second mixing zone 255, and the third mixing zone 256 for ease of description. The first mixing zone 254 is located between the large cylinder 251 and the middle cylinder 252; the second mixing zone 255 is located between the middle cylinder 252 and the small cylinder 253; and the third mixing zone 256 is located inside the small cylinder 253. A rotating ring is rotatably connected to the large cylinder 251, which has circumferential openings 2511. The rotating ring is connected to two liquid inlets 22. Thus, when the outer cylinder rotates, it can sequentially connect to the two liquid inlets 22, resulting in more uniform material distribution within the first mixing zone 254. In traditional feeding methods, the liquid inlets 22 are fixed, leading to material accumulation on one side and uneven mixing. In this application, the positions of the two liquid inlets 22 relative to the first mixing zone 254 are alternating, resulting in more uniform material mixing.

[0052] refer to Figure 5 , Figure 7 and Figure 9 The top of the large cylinder 251 is positioned higher than the top of the middle cylinder 252, which is higher than the top of the small cylinder 253. The extraction tank 2 also includes a mounting frame 24 and an end cap 26. The large cylinder 251 is mounted on the mounting frame 24. The outermost cylinder 25 is rotatably connected to a ring 27, and the liquid inlet 22 is located on the ring 27. The end cap 26 can seal the top of the large cylinder 251 and is detachably connected to the mounting frame 24. The end cap 26 has a connection part 261 for an external air pump, a pressure gauge 262, and a fixedly connected ring 263. A balance hole 264 passes through the ring 263. In this way, a pressure zone 265 is formed at the top of the large cylinder 251, the middle cylinder 252, and the small cylinder 253. By adjusting the pressure of the pressure zone 265, the mixing effect can be improved. Increasing the pressure can increase the solubility of the gas in the liquid phase and reduce the stabilizing effect of bubbles on emulsification. Moreover, the high-pressure zone shrinks the two-phase interface, reduces the diffusion distance, and enhances molecular mass transfer.

[0053] refer to Figure 7 , Figure 9 and Figure 10The first mixing zone 254 is equipped with a guide ring 28, which is located on the inner wall of the large cylinder 251. The guide ring 28 has a ramp surface 281, which guides the liquid towards the middle cylinder 252. Under the action of the middle cylinder 252, the liquid will gather towards the large cylinder 251. At this time, the liquid will spiral upward along the inner wall of the large cylinder 251. Guided by the ramp surface 281, the liquid can move longitudinally, accelerating the mixing effect of the materials. Compared with traditional stirring and mixing, mixing is achieved by changing the path, which can effectively avoid emulsification of the liquid.

[0054] refer to Figure 7 The ring 263 extends into the second mixing zone 255. The ring 263 divides the extraction zone into two flow zones with different rotation directions. The liquid flow forms a "U" shape, which not only extends the liquid mixing path, but also makes the liquid flow directions on the inner and outer sides opposite. The outer liquid flow direction is spiral downward, and the liquid flow direction near the inner side is spiral upward. The inner and outer liquid spiral directions are opposite, which greatly increases the liquid mixing effect.

[0055] Several inclined flow control plates 231 are provided on the inner wall of the annular body 263, with the inclination direction horizontally downward along the liquid rotation. As the middle cylinder 252 rotates, it throws the liquid outward. When the liquid encounters the flow control plates 231, it moves downward along the plates, increasing the complexity of the mixing path and enhancing the mixing effect. This promotes the mass transfer efficiency of rare earth elements between the two phases, enabling more stable operation control while maintaining high separation selectivity in the extraction process. The guide ring 28 mainly optimizes the flow pattern in the outer high-speed rotating zone, while the annular body 263 stabilizes the interface in the inner reverse flow zone. The angle design of the ramp surface 281 promotes full contact between the two phases, improving mass transfer efficiency while avoiding emulsification.

[0056] The outlet 21 is connected to the bottom of the small cylinder 253. By extending the mixing path of the extraction and increasing the complexity of the mixing path, the mixing effect is enhanced. Through the rotation of the large cylinder 251, the middle cylinder 252, and the small cylinder 253, and the coordination between the guide ring 28 and the flow control plate 231, a reasonable turbulence zone is set to improve the efficiency of liquid mixing. Compared with Example 1, which achieves mixing by stirring with the spiral blade 233, the high-speed rotation of the spiral blade 233 generates strong shear force, breaking the two-phase liquid into tiny droplets, increasing the contact area, and forming a temporarily stable emulsion. Example 2 accelerates the mixing of the liquid phase only by the rotation of the liquid, and achieves the mixing of the liquid phase through a complex rotation path, resulting in a gentler mixing force. The rotation speed of the liquid in the first mixing zone 254, the second mixing zone 255, and the third mixing zone 256 increases sequentially. The liquid in the first mixing zone 254 rotates and mixes at a low speed. At this time, the liquid mixes droplets. As the rotation speed is gradually increased, these droplets may be more inclined to collide and merge rather than further break up, thereby reducing the risk of emulsification.

[0057] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An extraction system, characterized in that: The system includes a rare earth dissolution tower (1) for transferring rare earth elements into a solution; an extraction tank (2) for transferring rare earth elements from the solution into different phases, equipped with several inlets (22), outlets (21), and a liquid rotation actuator (23). The outlets (21) are located near the top of the extraction tank (2), and the inlets (22) are located near the bottom of the extraction tank (2). The actuator (23) can drive the liquid to rotate at different speeds to form a rotation speed gradient; and a clarification tank (3) for separating the extracted liquid into layers. The extraction tank (2) includes several cylinders (25) of different sizes, which are nested in order of size. The execution component (23) drives the cylinders (25) of different sizes to rotate at different speeds. The rotation speed of the cylinders (25) increases gradually from the outside to the inside. The rotation directions of two adjacent cylinders (25) are opposite. The area between adjacent cylinders (25) is the extraction zone. The extraction tank (2) also includes a mounting frame (24) and an end cap (26). The outermost cylinder (25) is mounted on the mounting frame (24). The outermost cylinder (25) is rotatably connected to a ring (27). The liquid inlet (22) is located on the ring (27). The end cap (26) can seal the top of the outermost cylinder (25) and is detachably connected to the mounting frame (24). The end cap (26) is provided with a connection part (261) for an external air pump, a pressure gauge (262), and at least one ring (263) fixedly connected thereto. The ring (263) can extend into the extraction zone and has a balance hole (264) through it. The ring (263) divides the extraction zone into two flow zones with different rotation directions. Several flow control plates (231) are fixedly connected to the inner wall of the ring (263). The flow control plates (231) are arranged at an angle, with the angle tilting downwards along the rotation of the liquid. The extraction zone is provided with a guide ring (28), which is located on the outer side of the cylinder (25). The guide ring (28) and the ring body (263) are respectively located in different extraction zones, and the guide ring (28) is located on the slope surface (281).

2. The extraction system according to claim 1, characterized in that: The execution component (23) includes a power source and a power shaft (237) connected to the output end of the power source. The power shaft (237) is connected to the cylinder (25) by gears.

3. The extraction system according to any one of claims 1-2, characterized in that: The clarification tank (3) includes a box body and a partition (33) that divides the interior into a first zone (35) and a second zone (34). The first zone (35) is connected to at least one feed pipe, and the second zone (34) is connected to at least one discharge pipe. The first zone (35) and the second zone (34) are connected. At least one diversion plate (36) is provided at the connection between the first zone (35) and the second zone (34), and at least two guide arcs (37) are provided. A diversion zone is formed between adjacent diversion plates (36) and between the diversion plate (36) and the box body. The guide arcs (37) are close to the inlet and outlet of the diversion zone, respectively.

Images