Extraction system

Abstract

The invention discloses an extraction system which comprises a rare earth dissolving tower used for transferring rare earth elements into a solution; the extraction tanks are used for transferring rare earth elements in a solution into different phases and are provided with a plurality of liquid inlets, liquid outlets and execution assemblies for driving liquid to rotate, the liquid outlets are close to the top ends of the extraction tanks, the liquid inlets are close to the bottom ends of the extraction tanks, and the execution assemblies can drive the liquid to rotate at different speeds to form a rotation speed gradient; and the clarification tank is used for layering the extracted liquid. Through linkage design of rotating speed gradient, flow field optimization and air pressure cooperation, the method has breakthrough advantages in the aspects of inhibiting emulsification and improving mass transfer efficiency and operation stability. The method is particularly suitable for industrial separation of a high-fluorine and high-radioactivity rare earth system, and an innovative solution is provided for green and efficient rare earth smelting.

Description

Technical Field

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

[0002] Rare earth elements are 17 elements in the periodic table of chemical elements, including 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 lanthanum elements - scandium (Sc) and yttrium (Y). They are called rare earth elements (Rare Earth), abbreviated as rare earth (RE or R).

[0003] Solvent extraction is suitable for the mass production of rare earth elements with high abundance, such as lanthanum, erbium and yttrium. Solvent extraction separation refers to adding an organic solvent that is immiscible with water to the aqueous solution of the substance to be separated. With the help of the extractant, one or several 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 fixed amount of rare earth elements into an extraction tank, then feeding a fixed amount of solvent from the top of the tank. The system then heats and stirs the mixture to fully mix the liquid and solvent. After mixing is complete, the mixture enters a clarification tank for static separation. Stirring evenly disperses the liquid phases, forming fine droplets. However, stirring can also lead to emulsification. This 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 achieves more uniform dispersion and mixing between the liquid phases but also reduces the risk of emulsification. Summary of the Invention

[0005] The purpose of this application is to provide an extraction system to improve the solution mixing effect and prevent the occurrence of emulsification.

[0006] The present application provides an extraction system that adopts the following technical solution: a rare earth dissolution tower for transferring rare earth elements into a solution; Several extraction tanks are used to transfer rare earth elements in the solution into different phases. The tanks are provided with several liquid inlets, liquid outlets, and actuators for driving the liquid to rotate. The liquid outlets are located near the top of the extraction tanks, and the liquid inlets are located near the bottom of the extraction tanks. The actuators can drive the liquid to rotate at different speeds to form a rotation speed gradient. Clarification tank, used to separate the liquid after extraction; Using this 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. These extraction tanks are equipped with a liquid inlet, a liquid outlet, and a liquid rotation actuator. By rotating the liquid at varying speeds to create a velocity gradient, they achieve uniform dispersion and mixing between the liquid phases while avoiding emulsification caused by vigorous stirring. The separated liquids enter a clarification tank for final separation. This design effectively reduces the risk of emulsification while ensuring effective mixing, improving extraction efficiency and separation quality.

[0007] Optionally, when the number of the extraction tanks is greater than or equal to 2, the extraction tanks are connected in series in sequence, and the rotation speed of the liquid in the extraction tanks is accelerated in sequence along the direction of liquid flow.

[0008] By adopting the above technical solution, larger droplets can be formed first in the low-speed stage. When the 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. By using multiple extraction tanks connected in sequence, the liquid rotation actuator is used to form a controllable velocity gradient for the liquid in the tank, and the rotation speed is gradually increased along the flow direction. This progressive acceleration design can not only promote the full mixing of the feed liquid and the solvent, but also avoid the emulsification phenomenon caused by vigorous stirring, and at the same time use the speed difference to enhance the mass transfer efficiency. The mixed liquid after extraction enters the clarification tank for natural stratification to achieve efficient separation. While ensuring the extraction effect, this solution significantly reduces the risk of emulsification and improves the separation purity and process stability of rare earth elements.

[0009] Optionally, the execution assembly 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 rotation of the liquid, and the spiral blade is arranged between the liquid inlet and the spiral blade.

[0010] By adopting the above technical solution, the stirring shaft drives the spiral blade to rotate, and cooperates with the flow control plate installed on the inner wall of the extraction tank to achieve precise control of the liquid flow. The spiral blade is located between the liquid inlet and the flow control plate. While driving the liquid to rotate, the flow control plate forms a velocity gradient by hindering the liquid flow, so that the liquid and the solvent are fully contacted and mixed. This design not only avoids the emulsification problem easily caused by traditional stirring methods, but also synergistically enhances the mass transfer efficiency through the conveying effect of the spiral blade and the guiding effect of the flow control plate, so that rare earth elements can be transferred more stably between the two phases. While ensuring mixing uniformity, this structure effectively reduces the risk of emulsification and improves the extraction and separation effect.

[0011] Optionally, when the number of extraction tanks is 1, the extraction tank includes several cylinders of different sizes, which are nested in sequence according to size. The execution component drives the cylinders of different sizes to rotate at different speeds. The rotation speed of the cylinder increases step by step from the outside to the inside. The rotation directions of two adjacent cylinders are opposite, and the area between adjacent cylinders is the extraction area.

[0012] By adopting the above technical solution, a multi-layer nested cylinder design is used to achieve differentiated rotation speeds and counter-rotation to achieve efficient extraction. Cylinders of different sizes rotate at an accelerated rate from the outside to the inside, and adjacent cylinders rotate in opposite directions, forming a shear force field and velocity gradient between the cylinders. This structure causes a strong relative movement between the liquid and the solvent in the extraction zone, which not only ensures sufficient mixing contact, but also avoids the emulsification problem caused by traditional stirring through orderly fluid movement. The counter-rotating cylinders form vortices in adjacent areas, enhancing the mass transfer process, while the layered velocity gradient is conducive to the selective transfer of rare earth elements. This design achieves a multi-stage mixing effect in a single extraction tank, significantly improving the extraction efficiency and reducing the risk of emulsification.

[0013] Optionally, the extraction tank also includes a mounting frame and an end cover, the outermost cylinder is mounted on the mounting frame, the outermost cylinder is rotatably connected to a ring sleeve, the liquid inlet is set in the ring sleeve, and the end cover can seal the top of the outermost cylinder and is detachably connected to the mounting frame.

[0014] By adopting the above technical solution, the mounting frame and removable end caps achieve stable assembly and convenient maintenance of the multi-layer cylinder. The outermost cylinder is rotatably connected to the mounting frame through a ring sleeve, and the liquid inlet is integrated into the ring sleeve to ensure uniform introduction of the feed liquid. The end cap adopts a removable design, which can not only seal the top of the extraction tank to prevent leakage, but also facilitate equipment maintenance and cylinder replacement. While ensuring the independent rotation accuracy of the multi-layer cylinder, this structure enhances the overall sealing and operational convenience of the equipment, allowing the reverse rotation extraction system with a velocity gradient to operate stably for a long time. This modular design not only meets the needs of complex fluid control, but also improves the maintainability of the equipment, providing reliable hardware support for the efficient extraction of rare earth elements.

[0015] Optionally, the end cover is provided with a connection portion for an external air pump, a pressure gauge, and is fixedly connected with at least one ring body, which can extend into the extraction area and has a balancing hole running through it.

[0016] By adopting the above technical solution, an external air pump and a pressure gauge are used to accurately control the air pressure inside the extraction tank and optimize the mass transfer environment.

[0017] Optionally, the ring body divides the extraction area into two flow areas with different rotation directions. The inner wall of the ring body is fixedly connected to a plurality of flow control plates, which are arranged obliquely, and the inclination direction is downward along the liquid rotation level.

[0018] By employing this technical solution, the extraction zone is divided into two flow regions with different rotational directions. The inclined flow control plate on the inner wall of the annulus tilts downward in the direction of liquid rotation, creating a diversion effect. This guides the fluid into a downward axial motion, enhancing axial mixing and promoting the mass transfer efficiency of rare earth elements between the two phases. This allows for more stable operation and control of the extraction process while maintaining high separation selectivity.

[0019] Optionally, the extraction area is provided in a guide ring, the guide ring is provided on the cylinder body close to the outside, the guide ring and the ring body are respectively provided in different extraction areas, and the guide ring is provided on a slope surface.

[0020] By adopting the above technical solution, a guide ring with a sloped surface is added to the extraction area to form a partitioned collaborative control structure with the end cover ring body. The guide ring is installed on the outer cylinder, and its sloped surface design can effectively adjust the flow direction of the fluid, forming a complementary effect with the flow control plate of the ring body. This partitioned flow field control mechanism enables a more orderly fluid movement pattern to be formed in the extraction area: the guide ring mainly optimizes the flow type in the outer high-speed rotation zone, while the ring body stabilizes the interface of the inner reverse flow zone. The angle design of the slope surface promotes full contact between the two phases, improving the mass transfer efficiency while avoiding emulsification. This structure achieves a balance between mixing intensity and separation effect in the rare earth extraction process through stratified flow field control, allowing the single-stage extraction system to obtain separation performance close to that of a multi-stage series.

[0021] Optionally, the execution assembly includes a power source and a power shaft connected to an output end of the power source, and the power shaft is connected to the cylinder through a gear.

[0022] By adopting the above technical solution, the rotation of different cylinders is realized, and by controlling different speed ratios, the differential speed of liquid rotation in different extraction zones is achieved.

[0023] Optionally, the clarifier includes a box body, which is provided 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, the second zone is connected to at least one discharge pipe, and the first zone and the second zone are communicated; at least one diverter plate is arranged at the connection between the first zone and the second zone, and is provided with at least two guide arcs, and diverter areas are formed between adjacent diverter plates and between the diverter plates and the box body, and the guide arcs are respectively close to the inlet and outlet positions of the diverter area.

[0024] By adopting this technical solution, the inlet guide arc design helps eliminate sharp-angle vortices as the water enters, creating a Coanda effect that guides the fluid to flow along the wall, avoiding central jets and reducing interface disturbances. The outlet guide arc design prevents secondary vortices caused by boundary layer separation and reduces turbulence. The double guide arcs form a notch, effectively extending the kinetic energy absorption drive and reducing the water velocity at the outlet of the diversion area.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. The extraction system optimizes the liquid-liquid mixing process through staged speed control, significantly reducing the risk of emulsification. The series-connected extraction tanks utilize a stepped stirring strategy, from low to medium to high speed. The low-speed stage forms large droplets, reducing initial shear; the medium-speed stage enhances mass transfer; and the high-speed stage provides a short, efficient extraction. The counter-rotating nested cylinders create a complex flow field, encouraging droplet collision and merging rather than fragmentation.

[0026] 2. The introduction of a dynamic air pressure regulation system, by setting an air pressure zone at the top of the extraction tank, compresses the two-phase interface, shortens the diffusion distance, and improves the mass transfer rate. This inhibits the precipitation of dissolved gases and reduces the stabilizing effect of bubbles on the emulsion; it also assists in demulsification, making it easier for droplets to coalesce under high pressure, and significantly shortening the static stratification time.

[0027] 3. The extraction system, through its integrated design of speed gradient, flow field optimization, and gas pressure coordination, 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 highly radioactive rare earth systems, providing an innovative solution for green and efficient rare earth smelting. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the overall structure of Example 1 of the present application; Figure 2 This is a schematic diagram of the overall structure of the extraction tank in Example 1 of the present application; Figure 3 This is a schematic diagram of the overall structure of the clarification tank in Example 1 of the present application; Figure 4 This application Figure 3 A top view of Figure 5 This is a schematic diagram of the overall structure of the extraction tank in Example 2 of the present application; Figure 6 This is a schematic diagram of the overall structure of the execution component in Example 2 of the present application; Figure 7 This is a cross-sectional view of the extraction tank in Example 2 of the present application; Figure 8 This is a schematic diagram of the overall structure of the large cylinder in Example 2 of the present application; Figure 9 This is a schematic diagram of the overall structure of the end cover in Example 2 of the present application; Figure 10 This is a cross-sectional view of the end cover of Example 2 of the present application.

[0029] Explanation of Reference Numerals: 1. rare earth dissolution tower; 2. extraction tank; 21. liquid outlet; 22. liquid inlet; 23. actuator; 231. flow control plate; 232. stirring shaft; 233. spiral blade; 234. gear ring; 235. limiting block; 236. connecting shaft; 237. power shaft; 24. mounting frame; 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 cover; 261. Connection part; 262. Pressure gauge; 263. Ring body; 264. Balance hole; 265. Air pressure zone; 27. Ring sleeve; 28. Guide ring; 281. Slope surface; 3. Clarifying tank; 31. Liquid outlet pipe; 32. Liquid inlet pipe; 33. Partition; 34. Second zone; 35. First zone; 36. Diverter plate; 37. Guide arc. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1 -Attached Figure 10 This application is described in further detail.

[0031] The embodiments of the present application disclose an extraction system.

[0032] Example 1, reference Figure 1 An extraction system includes a rare earth dissolution tower 1, three extraction tanks 2, and a clarification tank 3. The extraction tanks 2 are respectively provided with a liquid inlet 22 and a liquid outlet 21. The liquid outlet 21 is close to the top of the extraction tank 2, and the liquid inlet 22 is close to the bottom of the extraction tank 2. The two extraction tanks 2 are connected in series, and the solution passes through the rare earth dissolution tower 1, the extraction tank 2 and the clarification tank 3 in sequence. The liquid flow speeds in the two extraction tanks 2 are different.

[0033] refer to Figure 2 The actuator 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 rotation of the liquid. The spiral blade 233 is arranged between the liquid inlet 22 and the spiral blade 233. Each extraction tank 2 is installed with a motor, and the output end of the motor is connected to the stirring shaft 232. The speed of the motor of each extraction tank 2 makes the rotation speed of the liquid in the extraction tank 2 different.

[0034] 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 shear. Above 1000 rpm, it only runs briefly to complete the extraction. The low speed stage allows larger droplets to form first. When the 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.

[0035] refer to Figure 3 and Figure 4 The clarifier 3 includes a box body, which is provided with a partition 33 that divides the interior into a first zone 35 and a second zone 34. The first zone 35 is connected to a liquid inlet pipe 32, and the second zone 34 is connected to two liquid outlet pipes 31. The first zone 35 and the second zone 34 are connected; three diverter plates 36 are arranged at the connection point between the first zone 35 and the second zone 34, and two guide arcs 37 are formed between adjacent diverter plates 36 and between the diverter plates 36 and the box body to form a diversion area. The guide arcs 37 are respectively close to the inlet and outlet positions of the diversion area; the design of the guide arc 37 at the inlet is conducive to eliminating sharp-angle vortices when the water flows in, forming a Coanda effect to guide the fluid to flow along the wall, avoiding central jets, and reducing interface disturbances. 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, which effectively extends the kinetic energy absorption drive and reduces the water flow rate at the outlet of the diversion area.

[0036] Example 2, reference Figure 5 、 Figure 6 and Figure 7 , which is different from Example 1, is that when the number of extraction tanks 2 is one, the extraction tank 2 includes several cylinders 25 of different sizes, which are nested in sequence according to size. The actuator 23 drives the cylinders 25 of different sizes to rotate at different speeds. The rotation speed of the cylinders 25 gradually increases 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 area. The number of cylinders 25 in Example 2 is three. For the convenience of description, they are named large cylinder 251, medium cylinder 252, and small cylinder 253 according to size. The bottom ends of the large cylinder 251 and the middle cylinder 252 are provided with stepped through-holes 257. The cylinders 25 are installed at the stepped through-holes 257 so that the cylinders 25 can rotate relative to each other. The bottom ends of the middle cylinder 252 and the small cylinder 253 are fixedly connected to a limiting block 235. The limiting block 235 cooperates with the stepped through-hole 257 to limit the movement of the cylinders 25, so that the cylinders 25 can maintain rotation and prevent separation.

[0037] refer to Figure 5 、 Figure 6 and Figure 7 The bottom ends of the large cylinder 251, the middle cylinder 252 and the small cylinder 253 are all provided with a gear ring 234. The actuator 23 includes a connecting shaft 236. The connecting shaft 236 is connected to the gear ring 234 through a gear. The transmission ratios of 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 increase successively. The speed of the small cylinder 253 is greater than the speed of the middle cylinder 252 and the speed of the large cylinder 251. The rotation direction of the large cylinder 251 and the small cylinder 253 is positive, and the rotation direction of the middle cylinder 252 is negative.

[0038] refer to Figure 7 and Figure 8 In Example 2, the extraction area is divided into three major areas, which are named the first mixing area 254, the second mixing area 255 and the third mixing area 256 for the convenience of description. The first mixing area 254 is between the large cylinder 251 and the middle cylinder 252, the second mixing area 255 is between the middle cylinder 252 and the small cylinder 253, and the third mixing area 256 is inside the small cylinder 253. A rotating ring is rotatably connected to the large cylinder 251, and the large cylinder 251 is circumferentially provided with an opening 2511. The rotating ring is connected to the two liquid inlets 22. In this way, when the outer cylinder rotates, the outer cylinder can be connected to the two liquid inlets 22 in sequence, and the material distribution in the first mixing area 254 is more uniform. The traditional feeding method is that the liquid inlet 22 is fixed. In the traditional method, the material will form a region and accumulate on one side, which is more likely to cause uneven mixing. The two liquid inlets 22 of the present application are in alternating positions relative to the first mixing area 254. In this way, the material mixing is more uniform.

[0039] refer to Figure 5 、 Figure 7 and Figure 9 , the position of the top of the large cylinder 251> the position of the top of the middle cylinder 252> the position of the top of the small cylinder 253, the extraction tank 2 also includes a mounting frame 24 and an end cover 26, the large cylinder 251 is mounted on the mounting frame 24, the outermost cylinder 25 is rotatably connected to the ring sleeve 27, the liquid inlet 22 is arranged on the ring sleeve 27, the end cover 26 can seal the top of the large cylinder 251 and is detachably connected to the mounting frame 24, the end cover 26 is provided with a connection part 261 for an external air pump, a pressure gauge 262, and a fixed connection with a ring body 263, a balancing hole 264 is passed through the ring body 263, so that an air pressure zone 265 is formed at the top position of the large cylinder 251, the middle cylinder 252 and the small cylinder 253. By adjusting the air pressure of the air pressure zone 265, the mixing effect can be better, the pressure can be increased, the solubility of the gas in the liquid phase can be increased, and the stabilizing effect of bubbles on the emulsification can be reduced; not only that, the high-pressure zone shrinks the two-phase interface, reduces the diffusion distance, and enhances molecular mass transfer.

[0040] refer to Figure 7 、 Figure 9 and Figure 10 A guide ring 28 is provided within the first mixing zone 254. This guide ring 28 is mounted on the inner wall of the main cylinder 251 and has a sloped surface 281. This sloped surface 281 guides the liquid toward the middle cylinder 252. Under the influence of the middle cylinder 252, the liquid gathers toward the main cylinder 251. At this point, the liquid spirals upward along the inner wall of the main cylinder 251. Guided by the sloped surface 281, the liquid moves longitudinally, accelerating the mixing of the materials. Compared to traditional stirring, mixing achieved through path change can effectively prevent liquid emulsification.

[0041] refer to Figure 7The ring body 263 extends into the second mixing zone 255. The ring body 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 spirals downward, and the inner liquid flow direction spirals upward. The spiral directions of the liquids on the inner and outer sides are opposite, which greatly increases the liquid mixing effect.

[0042] The inner wall of the ring body 263 is provided with a number of inclined flow control plates 231, which are inclined downward along the horizontal direction of the liquid rotation. In this way, the middle cylinder 252 rotates to swing the liquid outward. When the liquid hits the flow control plate 231, the liquid will move downward along the flow control plate 231, increasing the complexity of the mixing path and enhancing the mixing effect of the materials. It promotes the mass transfer efficiency of rare earth elements between the two phases, so that the extraction process can achieve more stable operation control while maintaining high separation selectivity. The guide ring 28 mainly optimizes the flow pattern in the outer high-speed rotation zone, while the ring body 263 stabilizes the interface of the inner reverse flow zone. The angle design of the slope surface 281 promotes full contact between the two phases, while avoiding emulsification and improving mass transfer efficiency.

[0043] The liquid outlet 21 is connected to the bottom of the small tube 253. By extending the extraction mixing path and increasing the complexity of the mixing path, the mixing effect is enhanced. Through the rotation of the large tube 251, the middle tube 252, and the small tube 253, the cooperation between the guide ring 28 and the flow control plate 231, and the reasonable setting of the turbulent zone, the efficiency of liquid mixing is improved. Compared with Example 1, which achieves mixing by stirring with the spiral blade 233, the high-speed rotation of the spiral blade 233 generates a strong shear force, which breaks up the two-phase liquid into tiny droplets, increases the contact area, and forms 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, and the mixing force is softer; the rotation speed of the liquid in the first mixing zone 254, the second mixing zone 255, and the third mixing zone 256 increases successively. The liquid in the first mixing zone 254 rotates and mixes at a low speed. At this time, the liquid mixed droplets, when 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.

[0044] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An extraction system, characterized in that: include A rare earth dissolution tower (1) for transferring rare earth elements into a solution; A plurality of extraction tanks (2) are used to transfer rare earth elements in a solution into different phases, and are provided with a plurality of liquid inlets (22), liquid outlets (21), and actuators (23) for driving the liquid to rotate, wherein the liquid outlets (21) are close to the top of the extraction tanks (2), and the liquid inlets (22) are close to the bottom of the extraction tanks (2). The actuators (23) can drive the liquid to rotate at different speeds to form a rotation speed gradient; The clarifier (3) is used to separate the liquid after extraction.

2. The extraction system according to claim 1, characterized in that: When the number of the extraction tanks (2) is greater than or equal to 2, the extraction tanks (2) are sequentially connected in series, and along the direction of liquid flow, the rotation speed of the liquid in the extraction tanks (2) is sequentially accelerated.

3. The extraction system according to claim 2, characterized in that: The execution assembly (23) includes a stirring shaft (232), a spiral blade (233) fixedly connected to the stirring shaft (232), and a flow control plate (231) mounted on the inner wall of the extraction tank (2), wherein the flow control plate (231) is perpendicular to the direction of rotation of the liquid, and the spiral blade (233) is arranged between the liquid inlet (22) and the spiral blade (233).

4. The extraction system according to claim 1, wherein: When the number of the extraction tank (2) is one, the extraction tank (2) comprises a plurality of cylinders (25) of different sizes, which are nested in sequence according to their sizes. The actuator (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, and the area between the adjacent cylinders (25) is the extraction area.

5. The extraction system according to claim 4, characterized in that: The extraction tank (2) further comprises a mounting frame (24) and an end cap (26), wherein the outermost cylinder (25) is mounted on the mounting frame (24), the outermost cylinder (25) is rotatably connected to a ring sleeve (27), the liquid inlet (22) is provided on the ring sleeve (27), and the end cap (26) is capable of sealing the top end of the outermost cylinder (25) and is detachably connected to the mounting frame (24).

6. The extraction system according to claim 5, characterized in that: The end cover (26) is provided with a connection portion (261) for an external air pump, a pressure gauge (262), and is fixedly connected with at least one ring body (263), the ring body (263) being capable of extending into the extraction area, and a balancing hole (264) is passed through the ring body (263).

7. The extraction system according to claim 6, characterized in that: The ring body (263) divides the extraction area into two flow areas with different rotation directions. The inner wall of the ring body (263) is fixedly connected to a plurality of flow control plates (231). The flow control plates (231) are arranged obliquely, and the oblique direction is downward along the liquid rotation level.

8. The extraction system according to claim 7, wherein: The extraction zone is provided in a guide ring (28), which is provided on the cylinder (25) close to the outside. The guide ring (28) and the ring body (263) are respectively provided in different extraction zones, and the guide ring (28) is provided on a slope surface (281).

9. The extraction system according to claim 8, characterized in that: The execution assembly (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) via a gear.

10. The extraction system according to any one of claims 1 to 9, characterized in that: The clarifier (3) includes The box body is provided with a partition (33) that divides the interior into a first area (35) and a second area (34), the first area (35) is connected to at least one feed pipe, the second area (34) is connected to at least one discharge pipe, and the first area (35) and the second area (34) are in communication; At least one diverter plate (36) is disposed at the connection between the first area (35) and the second area (34), and is provided with at least two guide arcs (37). A diverter area is formed between adjacent diverter plates (36) and between the diverter plates (36) and the box body, and the guide arcs (37) are respectively close to the inlet position and the outlet position of the diverter area.

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