Centrifugal anti-blocking gas-liquid separation continuous crystallization equipment

Abstract

The invention relates to the technical field of crystallization equipment, in particular to centrifugal anti-blocking gas-liquid separation continuous crystallization equipment. According to the technical scheme, the device comprises an evaporative crystallization system and a gas-liquid separation system integrated in a scrubber tank. A high-speed rotating centrifugal separation mechanism is adopted to replace a traditional wire mesh demister, efficient gas-liquid-solid separation is achieved through centrifugal force, and the problem of blockage caused by crystal attachment is fundamentally solved. The gas-liquid separation system is provided with a mechanical liquid discharge structure which can be automatically opened and closed and has a self-dredging function, and a differential adjusting mechanism which can generate a rotating speed difference to realize online scale scraping and blockage clearing. The device realizes continuous, efficient and stable purification of crystal-containing steam, effectively protects key equipment such as a compressor, ensures complete closed-loop recovery of mother liquor, has the advantages of strong anti-clogging performance, high separation efficiency, automatic operation and convenient maintenance, and is suitable for the continuous crystallization process of Bayer process mother liquor and other high-difficulty materials.

Description

Technical Field

[0001] This invention relates to the field of crystallization equipment technology, and in particular to a centrifugal anti-clogging gas-liquid separation continuous crystallization device. Background Technology

[0002] The ion adsorption resin method for recovering gallium or vanadium from the Bayer process circulating mother liquor aims to convert the high-concentration metal salt solution obtained from resin elution into a high-purity, commercially viable solid crystalline product. This system is primarily based on the principle of mechanical vapor recompression evaporation crystallization and is a closed-loop system integrating thermal energy and material circulation. The core components include an evaporator, a separation tank, and a gas washing tank for gas-liquid separation.

[0003] In the gas-liquid separation process, wire mesh demisters are a widely used traditional technology. Although they have a simple structure and high separation efficiency for clean gases, they have significant limitations when dealing with secondary steam generated by the evaporation and crystallization of Bayer process mother liquor. The main problems are blockage and separation failure.

[0004] First, the Bayer process mother liquor has a complex composition. The secondary steam generated by evaporation carries fine crystal nuclei rich in elements such as sodium, aluminum, and silicon. When these crystal nuclei flow through the intricate micropores of the wire mesh pad, they are very easy to adhere to, grow, and bridge each other on the surface of the wires, eventually forming a hard scale layer that severely blocks the airflow channel. This will cause the pressure drop of the gas washing tank itself to rise sharply, resulting in a drop in the compressor inlet pressure, forcing the compressor to deviate from its design operating conditions, reduce efficiency, and increase energy consumption.

[0005] Secondly, the separation mechanism of the wire mesh pad relies on the coalescence and dripping of droplets after they collide with the wires. However, when the steam velocity is high or the wire mesh structure is poorly designed, the captured droplets may be torn apart again by the high-speed airflow, breaking into smaller and more numerous fine droplets. These newly formed droplets are more difficult to capture, thus penetrating the wire mesh pad and being carried into the compressor and subsequent processes. This phenomenon not only reduces the gas-liquid separation efficiency and leads to a decrease in steam purity, but also causes intangible losses to the target metal products and may damage the impeller due to the high-speed impact of droplets in the compressor. Summary of the Invention

[0006] The purpose of this invention is to address the problems existing in the background technology by proposing a high-efficiency centrifugal anti-clogging gas-liquid separation continuous crystallization device that is resistant to secondary entrainment and easy to maintain.

[0007] The technical solution of the present invention: a centrifugal anti-clogging gas-liquid separation continuous crystallization device, comprising an evaporation crystallization system, wherein the evaporation crystallization system comprises a separation tank, an evaporation tank installed on one side of the separation tank, and a gas washing tank fixedly installed on the separation tank;

[0008] The gas-liquid separation system installed inside the gas washing tank includes multiple centrifugal separation mechanisms fixedly installed inside the separation tank. Each centrifugal separation mechanism includes a conical bottom plate and a top plate located above the bottom plate, which are rotatably installed inside the gas washing tank. An air passage is formed between the bottom plate and the top plate. A liquid collection chamber is provided on one side of the air passage, and an exhaust groove is provided on the side of the top plate located in the liquid collection chamber.

[0009] The liquid collection chamber is provided with multiple drain holes, and a drain structure is installed on the drain holes. The drain structure controls the opening and closing of the drain holes according to the liquid volume inside the liquid collection chamber.

[0010] A scraper fixedly installed on the top plate to remove substances adhering to the bottom plate;

[0011] A rotating shaft installed inside the gas washing tank is fixedly connected to the bottom plate via a connecting block. The rotating shaft is connected to the top plate via a differential connector, which controls the tightness between the top plate and the rotating shaft.

[0012] A drive assembly mounted on the gas washing tank drives the rotating shaft to rotate.

[0013] Optionally, a sealing ring is rotatably installed between the end faces of the bottom plate and the top plate, and the drain holes are arranged in a circumferential array on the sealing ring.

[0014] Optionally, the drainage structure includes an installation cylinder fixedly installed on the sealing ring. The installation cylinder has a fine hole and a coarse hole that are coaxially arranged and connected with the drainage hole. A sealing plug is slidably installed in the fine hole and is fixedly connected to the sealing plug. A connecting rod that is fixedly connected to the sealing plug is slidably installed on the installation cylinder. A spring is fixedly installed between the sealing plug and the installation cylinder.

[0015] A guide rail is fixedly installed on the base plate, a slider is slidably installed on the guide rail, a connecting rod is rotatably installed between the slider and the connecting rod, a rolling element is rotatably installed on the slider, and a guide component for driving the slider to slide is installed inside the air washing tank.

[0016] Optionally, the length of the sealing plug is greater than that of the pore and extends through the pore.

[0017] Optionally, the guide includes a support plate fixedly installed inside the gas washing tank and a plurality of elliptical guide plates fixedly installed on the support plate.

[0018] Optionally, the connecting block is provided with multiple slots, and the inner and outer rings of the connecting block are fixedly connected to the rotating shaft and the base plate, respectively.

[0019] Optionally, the cross-sectional area of ​​the exhaust groove is larger than the cross-sectional area of ​​the air passage, and the cross-sectional area of ​​the air passage gradually increases from bottom to top.

[0020] Optionally, the differential connection includes a liquid tank located inside the rotating shaft, the rotating shaft having a flow hole communicating with the liquid tank, multiple pressure rods slidably installed inside the liquid tank door, the pressure rods extending to the outside of the liquid tank and having a pressure plate fixedly installed thereon, and an elastic cover fixedly installed between the end of the pressure rod located inside the liquid tank and the liquid tank.

[0021] The flow hole and liquid tank are filled with hydraulic medium. The top of the rotating shaft is rotated and sealed with a plugging rod to block the flow hole. A connecting plate is fixedly installed on the plugging rod. A push rod motor is fixedly installed on the gas washing tank. The output shaft of the push rod motor is fixedly connected to the connecting plate.

[0022] Optionally, the drive assembly includes a motor fixedly mounted on the gas washing tank and a transmission belt mounted between the motor output shaft and the rotating shaft.

[0023] Optionally, a return liquid tank is provided inside the gas washing tank and below the drainage structure. A return liquid pipe is fixedly installed on the return liquid tank. The other end of the return liquid pipe is connected to the separation tank. Multiple serrated strips are fixedly installed on the top plate, and the serrations on the serrated strips are staggered.

[0024] Compared with the prior art, this application includes at least one of the following beneficial technical effects:

[0025] This application effectively overcomes the problems of clogging and reduced separation efficiency faced by traditional wire mesh demisters when dealing with easily crystallizing vapors from Bayer process mother liquor. By adopting the dynamic centrifugal separation principle, it fundamentally avoids the clogging of the fixed filter medium by solid particles, and significantly improves the operating cycle and stability of the gas-liquid separation system.

[0026] Furthermore, by utilizing a unique mechanical automatic drainage and self-cleaning structure, the contradiction between liquid sealing and drainage on the rotary sealing component is cleverly resolved, and the crystallization blockage of the drainage hole is prevented, ensuring reliable recovery of the separated liquid. The adjustable differential speed design allows the equipment to clean internal scale online according to the working conditions, maintaining the best separation efficiency. Attached Figure Description

[0027] Figure 1 Schematic diagram of crystallization equipment Figure 1 ;

[0028] Figure 2 Schematic diagram of crystallization equipment Figure 2 ;

[0029] Figure 3 Schematic diagram of crystallization equipment Figure 3 ;

[0030] Figure 4 This is a schematic diagram of the gas scrubbing tank.

[0031] Figure 5 for Figure 4 A magnified view of a section at point A in the middle;

[0032] Figure 6 This is a schematic diagram of a gas-liquid separation system;

[0033] Figure 7 for Figure 6 A magnified view of a section at point B in the middle;

[0034] Figure 8 for Figure 6 A magnified view of a section at point C;

[0035] Figure 9 This is a structural schematic diagram of a guide component;

[0036] Figure 10 for Figure 9 A magnified view of a section at point D;

[0037] Figure 11 This is a schematic diagram of the scraper and saw blade structure;

[0038] Figure 12 This is a structural schematic diagram of the top plate.

[0039] Attached reference numerals: 1. Evaporation crystallization system; 11. Separation tank; 12. Evaporation tank; 13. Gas washing tank; 14. Gas pipe; 15. Compressor; 151. First pipeline; 152. Second pipeline; 16. Connecting pipeline; 17. Pump set; 18. Delivery pipe;

[0040] 2. Gas-liquid separation system; 21. Centrifugal separation mechanism; 211. Base plate; 212. Top plate; 213. Gas passage; 214. Sealing ring; 215. Exhaust trough; 216. Liquid collection chamber;

[0041] 22. Drainage structure; 221. Mounting cylinder; 2211. Fine orifice; 2212. Coarse orifice; 222. Sealing plug; 223. Connecting rod; 224. Spring; 225. Guide rail; 226. Slider; 227. Connecting rod; 228. Rolling element;

[0042] 23. Guide component; 231. Support plate; 232. Guide plate;

[0043] 24. Rotating shaft; 241. Flow hole;

[0044] 25. Connecting block; 251. Groove;

[0045] 26. Differential connector; 261. Liquid tank; 262. Pressure rod; 263. Pressure plate; 264. Elastic cover; 265. Sealing rod; 266. Connecting plate; 267. Push rod motor;

[0046] 27. Drive assembly; 271. Motor; 272. Drive belt;

[0047] 28. Scraper; 281. Serrated blade;

[0048] 29. Return tank; 291. Return pipe. Detailed Implementation

[0049] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0050] Example: Figures 1-3 As shown, the present invention proposes a centrifugal anti-clogging gas-liquid separation continuous crystallization device, comprising an evaporation crystallization system 1. The evaporation crystallization system 1 includes a separation tank 11, an evaporation tank 12 installed on one side of the separation tank 11, and a gas washing tank 13 fixedly installed on the separation tank 11. The bottom of the separation tank 11 is connected to the bottom of the evaporation tank 12 via a connecting pipe 16, and the top of the separation tank 11 is connected to the bottom of the gas washing tank 13 via a gas pipe 14. A compressor 15 is fixedly installed on one side of the separation tank 11. The inlet of the compressor 15 is connected to the top of the gas washing tank 13 via a first pipe 151, and the output of the compressor 15 is connected to the evaporation tank 12 via a second pipe 152. This U-shaped tube design with direct bottom connection forms the core of the thermosiphon natural circulation loop. In the evaporator 12, the solution is heated and its density decreases, forming a light phase of gas-liquid mixture. In the separator 11, the mother liquor and crystal slurry after flash evaporation have relatively low temperature and high density. The connection between the bottoms of the two tanks allows their liquid columns to connect. The static pressure generated by the liquid column on the side of the separator 11 with higher density will push the liquid column on the side of the evaporator 12 with lower density to rise, thereby forming a continuous and stable solution circulation flow. Under ideal operating conditions, the system can achieve self-circulation entirely by relying on the driving force generated by the density difference, without relying on a high-power forced circulation pump, thus significantly reducing the energy consumption of the equipment.

[0051] Secondary steam drawn from the top of separator 11 enters scrubbing tank 13 through gas pipe 14 for purification, removing entrained droplets and crystals. The clean steam is drawn into and compressed by compressor 15, increasing its temperature and pressure, and then sent to the shell side of evaporator 12 through second pipe 152 as a heat source. The steam condenses and releases heat in evaporator 12, heating the circulating material in the tube side, and condenses itself into condensate and is discharged. This closed loop achieves efficient recovery and reuse of latent heat of steam.

[0052] A pump set 17 is fixedly installed at the bottom of the evaporator 12. The input end of the pump set 17 is connected to the separator 11, and the output end of the pump set 17 is connected to the bottom of the evaporator 12 through the delivery pipe 18. This pump set 17 serves as an auxiliary or backup drive unit. When the system starts up, the heat load is insufficient and the natural circulation driving force is weak, or when a higher circulation flow rate is required to process high-viscosity, easily scaled materials, the slurry at the bottom of the separator 11 is forcibly pumped to the bottom of the evaporator 12 to ensure the stability and strength of the circulation flow. With the addition of the pump set 17, the system combines the low energy consumption advantage of natural circulation with the high reliability and strong adaptability of forced circulation, thus improving the overall operational flexibility.

[0053] like Figures 4-7 and Figure 11 , Figure 12 As shown, the continuous crystallization equipment in this embodiment also includes a gas-liquid separation system 2 installed inside the gas washing tank 13. The gas-liquid separation system 2 includes multiple centrifugal separation mechanisms 21 fixedly installed inside the separation tank 11. Each centrifugal separation mechanism 21 includes a conical bottom plate 211 rotatably installed inside the gas washing tank 13 and a top plate 212 located above the bottom plate 211. An air passage 213 is formed between the bottom plate 211 and the top plate 212. A liquid collection chamber 216 is provided on one side of the air passage 213, and an exhaust groove 215 is provided on the side of the top plate 212 located in the liquid collection chamber 216. Gas passes through the gas pipe 14. The gas enters the washing tank 13 tangentially and is introduced into the air passage 213 of the high-speed rotating centrifugal separation mechanism 21. Under the action of strong centrifugal force, the denser droplets and solid crystals in the gas are thrown towards the outer wall of the air passage 213 and introduced into the liquid collection chamber 216 along the wall. The purified gas is discharged through the exhaust groove 215 located in the center. This can transform the traditional wire mesh pad filtration into dynamic centrifugal separation, which uses density difference for separation. In principle, it avoids fine particles directly clogging the fixed holes or gaps, greatly enhances the anti-clogging ability, and improves the separation efficiency of fine particles.

[0054] A sealing ring 214 is rotatably installed between the end faces of the bottom plate 211 and the top plate 212. Drain holes are arranged in a circumferential array on the sealing ring 214. The liquid collected in the collection chamber 216 can be discharged through the drain holes. However, when the liquid level does not reach a certain height, the structure on the sealing ring 214 can ensure that a portion of liquid is always present in the drain holes, forming a mechanical liquid seal. This effectively provides a simple and reliable mechanical liquid seal solution without the need for complex electric valves or liquid level sensors. It is especially suitable for achieving the unity of sealing and drainage on high-speed rotating components.

[0055] As one embodiment, the continuous crystallization equipment also includes a scraper 28 fixedly installed on the top plate 212 to scrape off the deposits on the bottom plate 211. The scraper 28 prevents crystals from accumulating on the rotating surface of the bottom plate 211. When there is a speed difference between the top plate 212 and the bottom plate 211, the scraper 28 fixed on the top plate 212 will move relative to the surface of the bottom plate 211, thereby continuously scraping the bottom plate 211 to remove crystals or scale that may be attached to its surface, preventing the inlet or flow channel of the air passage 213 from narrowing or even blocking due to scaling, thereby ensuring the long-term unobstructed flow of the air passage.

[0056] Multiple serrated strips 281 are fixedly installed on the top plate 212. The serrations on the serrated strips 281 are staggered. The high-speed rotating serrated strips 281 are like a dynamic bubble-breaking net and impact target. The staggered distribution of the serrations can maximize the probability of collision with droplets and fine crystals in the airflow. After the droplets collide with the serrations, they are easy to agglomerate into large droplets, which are more easily thrown out and separated under the action of centrifugal force. At the same time, the serrations also have a disturbance effect on the airflow, which can disperse any possible vapor droplets, thereby accelerating the gas-liquid separation process and improving the overall separation efficiency.

[0057] Furthermore, the cross-sectional area of ​​the exhaust groove 215 is larger than that of the air passage 213. The cross-sectional area of ​​the air passage 213 gradually increases from bottom to top. This gradual increase in the cross-sectional area of ​​the air passage 213 causes the airflow velocity to gradually decrease during the upward process. The reduced flow velocity can reduce the shear force of the gas on the separated liquid and the liquid film on the wall surface, effectively preventing the liquid from being torn and entrained again. The large cross-sectional area of ​​the exhaust groove 215 can reduce the flow velocity of the outlet gas and prevent the separated liquid from being sucked out.

[0058] like Figures 4-11 As shown in this embodiment, the liquid collection chamber 216 is provided with multiple drain holes, and a drain structure 22 is installed on the drain holes. The drain structure 22 controls the opening and closing of the drain holes according to the liquid volume inside the liquid collection chamber 216. This mechanical drain structure 22 solves the problem of achieving liquid sealing and automatic draining on rotating parts. It does not require electrical signals and rotary joints, but only relies on centrifugal force and mechanical linkage for control. When the liquid level is low, the structure can close the drain hole and use the liquid remaining in the hole to form a liquid seal to prevent gas short circuit. When the liquid level accumulates to a set height, the hydraulic pressure generated by centrifugal force is sufficient to drive the mechanism to open the drain hole to drain the liquid. However, this design of always retaining some liquid also brings the risk that the drain hole is easily blocked by crystals precipitated from the high-concentration mother liquor, requiring the mechanism itself to have an anti-blocking function.

[0059] Furthermore, the drainage structure 22 includes a mounting cylinder 221 fixedly mounted on the sealing ring 214. The mounting cylinder 221 has a fine hole 2211 and a coarse hole 2212 coaxially arranged and communicating with the drainage hole. A sealing plug 222 is slidably mounted and sealed within the fine hole 2211. A connecting rod 223, fixedly connected to the sealing plug 222, is slidably mounted on the mounting cylinder 221. A spring 224 is fixedly mounted between the sealing plug 222 and the mounting cylinder 221. Under the preload of the spring 224... When used, the end of the sealing plug 222 usually blocks the fine hole 2211, thereby closing the drainage channel. When the liquid in the collection chamber 216 increases and the liquid level rises to the drainage hole area, the liquid exerts a gradually increasing pressure on the end face of the sealing plug 222 under the action of centrifugal force. When this pressure exceeds the preload of the spring 224, it will push the sealing plug 222 to move inward, thereby opening the fine hole 2211. The liquid is thrown out in sequence through the drainage hole, the coarse hole 2212 and the opened fine hole 2211.

[0060] The base plate 211 is fixedly mounted with a guide rail 225, and a slider 226 is slidably mounted on the guide rail 225. A connecting rod 227 is rotatably mounted between the slider 226 and the connecting rod 223. A rolling element 228 is rotatably mounted on the slider 226. A guide 23 is installed inside the gas washing tank 13 to drive the slider 226 to slide. When the liquid pressure pushes the sealing plug 222 to move, the connecting rod 223 and the connecting rod 227 will pull the slider 226 to slide along the guide rail 225 toward the center of rotation. Conversely, the action of the externally fixed guide 23 on the rolling element 228 can force the slider 226 to slide radially. In turn, the connecting rod mechanism pulls or pushes the sealing plug 222 to achieve active control or auxiliary adjustment of its opening and closing state.

[0061] It is worth noting that the length of the sealing plug 222 is greater than that of the fine hole 2211 and extends through the fine hole 2211. This allows the end of the sealing plug 222 to alternately enter the fine hole 2211 and extend into the drain hole during reciprocating motion. When the sealing plug 222 moves towards the drain hole to seal or open, its columnar end acts like a piston rod, which can mechanically scrape and clear the inside of the fine hole 2211 and the drain hole. This can effectively break down any crystals that may precipitate and accumulate therein, preventing the channel from being completely blocked. This directly solves the problem mentioned above where liquid seals easily lead to crystal blockage of the drain hole.

[0062] Furthermore, the guide component 23 includes a support plate 231 fixedly installed inside the gas washing tank 13 and multiple elliptical guide plates 232 fixedly installed on the support plate 231. When the liquid level in the collection chamber 216 is normal or low, the spring force keeps the sealing plug 222 in a closed or slightly open state. At this time, the running radius of the rolling element 228 is small, and its movement trajectory may contact or maintain a gap with the inner arc surface of the guide plate 232. This contact or design gap can be used to slightly pull the sealing plug 222 in each rotation to achieve periodic disturbance of its end and channel, and play a role in preventive unblocking.

[0063] When the liquid level rises abnormally, the centrifugal hydraulic pressure increases dramatically, pushing the sealing plug 222 to increase the running radius of the rolling element 228. At this time, the rolling element 228 will contact the outer arc surface of the guide plate 232 and be forced to the center under the action of the cam, thereby actively and significantly opening the sealing plug 222, realizing rapid pressure relief and emergency liquid drainage, and preventing the liquid level from being too high and affecting the separation effect.

[0064] As one implementation method, such as Figures 5-12 As shown, the continuous crystallization equipment in this embodiment also includes a rotating shaft 24 rotatably installed inside the gas washing tank 13. The rotating shaft 24 is fixedly connected to the bottom plate 211 via a connecting block 25. The connecting block 25 has multiple slots 251 extending through it. The inner and outer rings of the connecting block 25 are fixedly connected to the rotating shaft 24 and the bottom plate 211, respectively. Gas enters the rotating gas passage 213 through the slots 251. The design of the slots 251 ensures smooth gas passage, and their tangential or specific angle arrangement helps to guide the gas to rotate upon entry, enhancing the initial effect of centrifugal separation. The rotating shaft 24 is connected to the top plate 212 via a differential connector 26. The differential connector 26 controls... The tightness between the top plate 212 and the rotating shaft 24 is adjusted. When the differential connector 26 is locked, the top plate 212, the rotating shaft 24, and the bottom plate 211 rotate synchronously. At this time, the scraper 28 and the bottom plate 211 are relatively stationary, mainly serving to fix and guide the flow or perform slight scraping. When the differential connector 26 is loosened, a speed difference is allowed between the top plate 212 and the bottom plate 211. At this time, the scraper 28 fixed on the top plate 212 will move relative to the surface of the bottom plate 211, realizing active and powerful scraping and cleaning. At the same time, there is also relative shearing motion between the serrated strip 281 and the gas and droplets, which can more effectively break droplets and capture particles, thereby dynamically adjusting the separation intensity and self-cleaning force according to the actual working conditions.

[0065] Furthermore, the differential connector 26 includes a liquid tank 261 disposed inside the rotating shaft 24. The rotating shaft 24 has a flow hole 241 communicating with the liquid tank 261. Multiple pressure rods 262 are slidably installed inside the liquid tank 261. The pressure rods 262 extend to the outside of the liquid tank 261 and are fixedly installed with pressure plates 263. An elastic cover 264 is fixedly installed between the end of the pressure rod 262 located inside the liquid tank 261 and the liquid tank 261. The liquid tank 261, the flow hole 241, and the elastic cover 264 are all included. The sealed cavity is filled with hydraulic medium. When it is necessary to press the top plate 212, its pressure is increased. The pressure acts on the pressure rod 262 through the elastic cover 264, pushing the pressure rod 262 and the pressure plate 263 outward. The pressure plate 263 presses tightly against the friction surface of the top plate 212, and the rotating shaft 24 is locked to the top plate 212 through friction. When it is necessary to relax, the pressure is released. Under the action of the rebound force of the elastic cover 264, the pressure rod 262 retracts, reducing the clamping force and allowing slippage.

[0066] The flow hole 241 and the liquid tank 261 are filled with hydraulic medium. The top of the rotating shaft 24 is rotated and sealed with a blocking rod 265 that blocks the flow hole 241. A connecting plate 266 is fixedly installed on the blocking rod 265. A push rod motor 267 is fixedly installed on the gas washing tank 13. The output shaft of the push rod motor 267 is fixedly connected to the connecting plate 266. The push rod motor 267 drives the blocking rod 265 to move axially. When the blocking rod 265 moves downward, it compresses the volume of the medium in the closed hydraulic system, thereby increasing the system pressure and locking the differential connector 26. When the blocking rod 265 moves upward, it increases the system volume, reduces the pressure, and relaxes the system. Through the precise control of the push rod motor 267, the tightness of the connection between the top plate 212 and the rotating shaft 24 can be steplessly adjusted, thereby achieving precise and automatic control of the speed difference.

[0067] like Figure 4 and Figure 5 As shown, the continuous crystallization equipment also includes a drive assembly 27 installed on the gas washing tank 13. The drive assembly 27 drives the rotating shaft 24 to rotate. The drive assembly 27 includes a motor 271 fixedly installed on the gas washing tank 13 and a transmission belt 272 installed between the output shaft of the motor 271 and the rotating shaft 24. The motor 271 serves as a power source and transmits power to the rotating shaft 24 through the transmission belt 272, thereby driving the entire centrifugal separation mechanism 21 to rotate at high speed.

[0068] like Figure 6 and Figure 7As shown, in this embodiment, a return liquid tank 29 is provided inside the gas washing tank 13 and below the drain structure 22. A return liquid pipe 291 is fixedly installed on the return liquid tank 29, and the other end of the return liquid pipe 291 is connected to the separation tank 11. The liquids thrown out from the drain structure 22 of each centrifugal separation mechanism 21 are all collected by the inner wall of the gas washing tank 13 and guided to the return liquid tank 29 at the bottom. After the return liquid tank 29 collects these liquids rich in target metal components, it guides them all back to the separation tank 11 through the return liquid pipe 291, realizing the complete closed-loop recovery of the separated valuable mother liquor, avoiding product loss, and maintaining the overall material balance of the system. This is an important link to ensure a high recovery rate.

[0069] In this embodiment, the enriched liquid from the upstream is heated and flashed in the separation tank 11, generating supersaturation to crystallize the target metal salt, and at the same time generating crystal-containing vapor. This vapor enters the gas-liquid separation system 2 at the bottom of the gas washing tank 13 tangentially through the gas pipe 14. Multiple centrifugal separation mechanisms 21 in the system, driven by motors 271 through transmission belts 272 to rotate the shafts 24 at high speed, then start working. The vapor enters the conical air passage 213 formed by the bottom plate 211 and the top plate 212 through the slot 251 on the connecting block 25. Under the action of strong centrifugal force, droplets and crystals are thrown into the liquid collection chamber 216, while the clean vapor is discharged from the exhaust trough 215 and returned to the evaporator 12 as a heat source after being compressed by the compressor 15.

[0070] The separated liquid accumulates in the collection chamber 216, and its liquid level is automatically controlled by the drainage structure 22. When the liquid level rises, the centrifugal hydraulic pressure pushes the sealing plug 222 to compress the spring 224 to open the fine hole 2211 for drainage. At the same time, the reciprocating motion of the sealing plug 222 can clear the channel and prevent crystal blockage. The discharged liquid is returned to the separation tank 11 through the return tank 29 and the return pipe 291, realizing material closed loop.

[0071] To address the issue of scale buildup, the equipment is equipped with a differential connector 26 that allows for adjustable speed difference. The hydraulic pressure is adjusted via a push rod motor 267 to control the speed difference between the top plate 212 and the bottom plate 211, enabling the scraper 28 fixed to the top plate to scrape off the deposits on the bottom plate. At the same time, the serrated strip 281 enhances the separation effect.

[0072] The entire evaporation crystallization system 1 forms a thermosiphon natural circulation through the connecting pipe 16 at the bottom of the separation tank 11 and the evaporation tank 12, with the pump set 17 serving as an auxiliary, together ensuring a continuous and stable crystallization and separation process.

[0073] The above specific embodiments are merely several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A centrifugal anti-clogging gas-liquid separation continuous crystallization device, characterized in that, The system includes an evaporation crystallization system (1), which includes a separation tank (11), an evaporation tank (12) installed on one side of the separation tank (11), and a gas washing tank (13) fixedly installed on the separation tank (11). A gas-liquid separation system (2) is installed inside the gas washing tank (13). The gas-liquid separation system (2) includes multiple centrifugal separation mechanisms (21) fixedly installed inside the separation tank (11). The centrifugal separation mechanism (21) includes a conical bottom plate (211) rotatably installed inside the gas washing tank (13) and a top plate (212) located above the bottom plate (211). An air passage (213) is formed between the bottom plate (211) and the top plate (212). A liquid collection chamber (216) is provided on one side of the air passage (213), and an exhaust groove (215) is provided on the side of the top plate (212) located in the liquid collection chamber (216). The liquid collection chamber (216) is provided with multiple drain holes, and a drain structure (22) is installed on the drain holes. The drain structure (22) controls the opening and closing of the drain holes according to the liquid volume inside the liquid collection chamber (216). A scraper (28) fixedly installed on the top plate (212) for scraping off the attachments on the bottom plate (211); Rotary shaft (24) installed inside the gas washing tank (13) is fixedly connected to the bottom plate (211) via connecting block (25). Rotary shaft (24) is connected to the top plate (212) via differential connector (26). The differential connector (26) controls the tightness between the top plate (212) and the rotating shaft (24). A drive assembly (27) is installed on the gas scrubber (13), which drives the rotating shaft (24) to rotate.

2. The centrifugal anti-clogging gas-liquid separation continuous crystallization equipment according to claim 1, characterized in that, A sealing ring (214) is rotatably installed between the end faces of the bottom plate (211) and the top plate (212), and the drain holes are arranged in a circumferential array on the sealing ring (214).

3. A centrifugal anti-clogging gas-liquid separation continuous crystallization device according to claim 2, characterized in that, The drainage structure (22) includes an installation cylinder (221) fixedly installed on the sealing ring (214). The installation cylinder (221) is provided with a fine hole (2211) and a coarse hole (2212) coaxially arranged and communicating with the drainage hole. A sealing plug (222) is slidably installed and sealed in the fine hole (2211). A connecting rod (223) fixedly connected to the sealing plug (222) is slidably installed on the installation cylinder (221). A spring (224) is fixedly installed between the sealing plug (222) and the installation cylinder (221). A guide rail (225) is fixedly installed on the base plate (211), a slider (226) is slidably installed on the guide rail (225), a connecting rod (227) is rotatably installed between the slider (226) and the connecting rod (223), a rolling element (228) is rotatably installed on the slider (226), and a guide (23) for driving the slider (226) to slide is installed inside the air washing tank (13).

4. A centrifugal anti-clogging gas-liquid separation continuous crystallization device according to claim 3, characterized in that, The length of the sealing plug (222) is greater than that of the pore (2211) and extends through the pore (2211).

5. A centrifugal anti-clogging gas-liquid separation continuous crystallization device according to claim 4, characterized in that, The guide (23) includes a support plate (231) fixedly installed inside the gas washing tank (13) and a plurality of elliptical guide plates (232) fixedly installed on the support plate (231).

6. A centrifugal anti-clogging gas-liquid separation continuous crystallization device according to claim 5, characterized in that, The connecting block (25) has multiple slots (251) through it, and the inner and outer rings of the connecting block (25) are fixedly connected to the rotating shaft (24) and the base plate (211) respectively.

7. A centrifugal anti-clogging gas-liquid separation continuous crystallization device according to claim 6, characterized in that, The cross-sectional area of ​​the exhaust groove (215) is larger than the cross-sectional area of ​​the air passage (213), and the cross-sectional area of ​​the air passage (213) gradually increases from bottom to top.

8. A centrifugal anti-clogging gas-liquid separation continuous crystallization device according to claim 7, characterized in that, The differential connector (26) includes a liquid tank (261) located inside the rotating shaft (24). The rotating shaft (24) has a flow hole (241) communicating with the liquid tank (261). Multiple pressure rods (262) are slidably installed inside the liquid tank (261). The pressure rods (262) extend to the outside of the liquid tank (261) and are fixedly installed with pressure plates (263). An elastic cover (264) is fixedly installed between the end of the pressure rod (262) located inside the liquid tank (261) and the liquid tank (261). The flow hole (241) and the liquid tank (261) are filled with hydraulic medium. The top of the rotating shaft (24) is rotated and sealed with a sealing rod (265) to block the flow hole (241). A connecting plate (266) is fixedly installed on the sealing rod (265). A push rod motor (267) is fixedly installed on the gas washing tank (13). The output shaft of the push rod motor (267) is fixedly connected to the connecting plate (266).

9. A centrifugal anti-clogging gas-liquid separation continuous crystallization device according to claim 8, characterized in that, The drive assembly (27) includes a motor (271) fixedly mounted on the gas scrubbing tank (13) and a transmission belt (272) mounted between the output shaft of the motor (271) and the rotating shaft (24).

10. A centrifugal anti-clogging gas-liquid separation continuous crystallization device according to claim 9, characterized in that, The gas washing tank (13) is provided with a return liquid tank (29) located below the drain structure (22). A return liquid pipe (291) is fixedly installed on the return liquid tank (29). The other end of the return liquid pipe (291) is connected to the separation tank (11). Multiple serrated strips (281) are fixedly installed on the top plate (212). The serrations on the serrated strips (281) are staggered.

Images