A new crystallizer

Abstract

This invention discloses a novel crystallizer, specifically relating to the field of crystal filtration technology. It includes a crystallization vessel with a feed inlet pipe and a crystal discharge pipe at the bottom. A reverse filtration assembly is installed between the discharge pipe and the crystallization vessel. The reverse filtration assembly includes a filter cylinder with multiple sets of telescopic plates inside. An eccentric shaft is also rotatably mounted inside the filter cylinder. A baffle plate, a filter plate, and a feed opening are provided at the end of the filter cylinder corresponding to the crystallization vessel. By controlling the rotation of the eccentric shaft, as the crystal gradually enters the area covered by the filter plate and continues to move, the crystal is relatively compressed, forcing a large amount of excess solution back into the crystallization vessel. This reduces the amount of solution discharged during crystal discharge, minimizing resource waste and significantly reducing the workload for subsequent crystal processing, effectively improving production efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of crystal filtering, and more particularly to a novel crystallizer. BACKGROUND

[0002] Crystallization is a widely used solid-liquid separation and purification technology in the fields of chemical industry, pharmaceutical industry, material industry, etc. (such as the separation and production of lithium hexafluorophosphate and other materials), and its basic principle is to make the solute in the solution precipitate in the form of crystals by changing the temperature, concentration or solvent composition, so as to realize the preliminary separation of crystals and solution and achieve the purification and morphology control of the product. Among the many crystallization methods, cooling crystallization, evaporation crystallization and anti-solvent crystallization are common industrial means, and according to the different operation modes, they can be divided into two categories: batch and continuous.

[0003] At present, in the actual crystallization separation process, a crystallization kettle is usually used, a supersaturated solution is input into the inside of the crystallization kettle, the solution is cooled in the crystallization kettle to reduce the solubility, the separation and precipitation of crystals are realized by controlling the upward flow of the solution, and the crystals are enriched at the bottom under the action of gravity and continuously or intermittently discharged through the discharge port, so as to ensure continuous crystallization production.

[0004] However, although a large amount of crystals is settled at the bottom of the crystallization kettle, a large amount of solution is also contained in the crystals, and when the crystals are discharged, a large amount of solution is also carried out, which has not been fully crystallized and is discharged together with the crystals. SUMMARY

[0005] The novel crystallizer provided by the present application solves the problem that a large amount of solution is carried out when the crystals are discharged, which has not been fully crystallized and is discharged together with the crystals.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a novel crystallizer, comprising a crystallization kettle, a feed liquid input pipe and a crystal discharge pipe are arranged in the bottom region of the crystallization kettle, a feed liquid output pipe is arranged in the top region of the crystallization kettle, and a back filtration assembly is arranged between the crystal discharge pipe and the crystallization kettle;

[0007] The back filtration assembly comprises a filter cylinder, one end of the filter cylinder extends into the inside of the crystallization kettle, the crystal discharge pipe is connected to the bottom region of the end of the filter cylinder, a plurality of expansion plates are arranged in the inside of the filter cylinder, an eccentric shaft is rotatably installed in the inside of the filter cylinder, and each expansion plate is installed on the eccentric shaft;

[0008] The two adjacent telescopic plates form a crystal containing cavity, the filter cartridge is provided with a blocking plate, a filter plate and a feeding opening in the end region corresponding to the crystallization kettle, the blocking plate is arranged corresponding to the crystal discharge pipe, the telescopic plate is in sliding contact with the inner wall of the filter cartridge through telescopic change, and the telescopic plate is also in sliding contact with the filter plate or the blocking plate.

[0009] Preferably, the blocking plate and the filter plate are fixedly installed in the filter cartridge, the feeding opening and the filter plate are arranged on the two sides above the blocking plate, the eccentric shaft is driven to rotate by the first rotary driver, the eccentric shaft is arranged downwardly deviated from the central axis of the filter cartridge, and the first rotary driver is used to drive the eccentric shaft to drive the telescopic plate to rotate in the direction from the feeding opening to the filter plate and then to the blocking plate.

[0010] Preferably, the telescopic plate is composed of a fixed plate and a sliding plate, the fixed plate is fixedly connected to the eccentric shaft, the sliding plate is slidingly installed in the fixed plate, and an elastic member is arranged between the sliding plate and the fixed plate, the elastic member is used to provide an elastic force to the sliding plate in a direction away from the eccentric shaft.

[0011] Preferably, the crystallization kettle comprises a cylinder body, a conical shell is fixedly connected to the bottom of the cylinder body, a spherical segment is fixedly connected to the bottom of the conical shell, one end of the liquid input pipe extends to the inside of the conical shell, and the output end of the liquid input pipe in the conical shell is arranged downwardly, one end of the filter cartridge is connected to the side wall of the conical shell and extends to the inside of the conical shell, and the end of the filter cartridge connected to the crystallization kettle is matched with the inner wall of the conical shell, and a ring pipe is further arranged outside the cylinder body, the ring pipe is connected to and communicated with the cylinder body through a communication pipe, and the liquid output pipe is arranged on the ring pipe.

[0012] Preferably, the backwashing assembly further comprises a gas supply connector pipe, the gas supply connector pipe is communicated with the crystal discharge pipe, the gas supply connector pipe is connected to an inert gas source, the inert gas source is used to input inert gas to the region of the crystal discharge pipe through the gas supply connector pipe, and the crystallization kettle is further provided with an exhaust pipe, the exhaust pipe is fixedly installed at the top of the cylinder body.

[0013] Preferably, the end of the filter cartridge away from the crystallization kettle is provided with a backwashing assembly, the backwashing assembly comprises a flow guide box, the flow guide box is fixedly installed on the filter cartridge, the flow guide box is provided with a flow uniformizing net corresponding to the position of the inner cavity of the filter cartridge, and the flow guide box is further connected with a clear liquid supply pipe, and the clear liquid supply pipe is connected to a low-saturation solution supply source.

[0014] Preferably, the gas supply connector pipe is arranged at the bottom region of the filter cartridge, the filter cartridge is provided with an elastic blocking strip at the region above the gas supply connector pipe, the inner wall of the filter cartridge is provided with a storage groove for storing the elastic blocking strip at the position corresponding to the elastic blocking strip, and the end of the elastic blocking strip away from the crystal discharge pipe is fixedly connected to the filter cartridge.

[0015] Preferably, the elastic baffle is composed of a rubber strip and a metal elastic sheet, the metal elastic sheet is located outside the rubber strip, and the rubber strip and the metal elastic sheet are fixedly connected.

[0016] Preferably, a scraper structure is further arranged in the crystallization kettle, the scraper structure is in sliding fit with the inner wall of the cylinder or the conical shell, a second rotating driver is fixedly installed at the top of the cylinder, a scraping shaft is rotatably arranged in the crystallization kettle, the scraper structure is fixedly connected with the scraping shaft through a support, and the scraping shaft is fixedly connected with the output shaft of the second rotating driver.

[0017] Preferably, the scraper structure is composed of a guide plate and an inclined scraper, the guide plate is fixedly connected with the scraping shaft through a support, the inclined scraper is located at one end of the guide plate away from the reverse rotation direction of the guide plate, a containing space is arranged between the guide plate and the side wall of the conical shell, the end of the inclined scraper is fixedly connected with an elastic scraper, and the elastic scraper is in sliding contact with the inner wall of the conical shell.

[0018] The beneficial effects of the present application are that:

[0019] 1. By controlling the rotation of the eccentric shaft, the crystal is relatively compressed in the process of gradually entering the area covered by the filter plate and continuing to move in the corresponding crystal containing cavity, a large amount of excess solution is reversely squeezed back into the crystallization kettle, the crystal from which most of the solution is removed can be collected, the discharge amount of the solution during crystal discharge is reduced, resource waste is reduced, a large amount of work for subsequent processing of the crystal is reduced, and the production efficiency is effectively improved.

[0020] 2. By arranging a plurality of crystal discharge tubes and backwashing assemblies, and by virtue of the structural design of the crystallization kettle, the crystals are collected in stages in advance, and under the action of the backwashing assemblies, the smaller crystals mixed therein can be flushed back into the crystallization kettle, and then in the process of continuing to move the crystal containing cavity and gradually compressing and extruding the solution, the smaller crystals can be reversely squeezed back into the crystallization kettle as much as possible, so that the accuracy of separation of the crystals at each stage during the staged collection of the crystals is further improved, the accuracy of the staged separation is higher, the processing efficiency of the crystals is further improved, and the production cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0022] Figure 2 It is a schematic diagram of the internal structure of the crystallization kettle of the present application;

[0023] Figure 3 It is a schematic diagram of the internal structure of the backwashing assembly of the present application;

[0024] Figure 4 It is a distribution state diagram of the telescopic plate in the filter cylinder;

[0025] Figure 5This is a diagram showing the distribution of the sealing plate, filter plate, and feed opening at the end of the filter cylinder according to the present invention.

[0026] Figure 6 This is a diagram showing the distribution of the telescopic plate inside the filter cylinder after the improvement of the reverse filtration assembly according to the present invention.

[0027] Figure 7 This is a diagram showing the distribution of the baffle plate, filter plate, and feed opening at the end of the filter cylinder after the present invention improves the reverse filter assembly.

[0028] Figure 8 This is a diagram showing the state of the backflush assembly of the present invention when it backflushes the uncompressed crystal in the crystal receiving cavity and backflushes out the smaller crystal;

[0029] Figure 9 This is a diagram showing the state of the compressed crystals being discharged from the crystal discharge tube after the improved reverse filtration component of the present invention.

[0030] Figure 10 This is a schematic diagram of the structure of the present invention after an elastic baffle is installed above the gas supply connector pipe;

[0031] Figure 11 This is a diagram showing the state of the elastic baffle when air is blown open by the air supply connector pipe of the present invention.

[0032] Figure 12 This is a schematic diagram of the internal structure of the crystallization vessel after adding the scraper structure according to the present invention;

[0033] Figure 13 This is a diagram showing the state of the scraper structure of the present invention as it passes the end of the filter cylinder inside the conical shell;

[0034] Figure 14 This is a schematic diagram of the structure of the present invention when an elastic scraper is provided at the end of the inclined scraper.

[0035] The attached figures are labeled as follows: 1. Crystallizer; 11. Shell; 111. Temperature sensor; 112. Exhaust pipe; 12. Conical shell; 13. Spherical cap; 2. Feed inlet pipe; 3. Feed outlet pipe; 31. Ring pipe; 4. Crystal discharge pipe; 5. Filter assembly; 51. Filter cylinder; 511. Sealing plate; 512. Filter plate; 513. Feed opening; 52. Telescopic plate; 521. Fixed plate; 522. Sliding plate; 523. Elastic element; 52 4. Crystal receiving cavity; 53. Eccentric shaft; 531. First rotary actuator; 54. Air supply connector pipe; 55. Backflush assembly; 551. Flow guide box; 552. Flow equalization net; 553. Clear liquid supply pipe; 56. Elastic baffle; 561. Rubber strip; 562. Metal elastic sheet; 6. Scraper structure; 601. Guide plate; 602. Inclined scraper; 603. Elastic scraper blade; 61. Second rotary actuator; 62. Scraper shaft. Detailed Implementation

[0036] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0037] Refer to the instruction manual appendix Figure 1 and Figure 2 A novel crystallizer includes a crystallization vessel 1. A liquid inlet pipe 2 is provided in the bottom region of the crystallization vessel 1, and a liquid outlet pipe 3 is provided in the top region of the crystallization vessel 1. The liquid inlet pipe 2 is used to input a pre-treated supersaturated solution into the crystallization vessel 1, so that the solution flows from bottom to top in the crystallization vessel 1 and crystals are precipitated. The crystals settle downwards and are mainly suspended and aggregated in the lower region inside the crystallization vessel 1. A crystal discharge pipe 4 is provided on the side wall of the lower region of the crystallization vessel 1, and a reverse filter assembly 5 is provided between the crystal discharge pipe 4 and the crystallization vessel 1.

[0038] For details, please refer to the instruction manual appendix. Figure 3 The reverse filtration assembly 5 includes a filter cylinder 51, which is a cylindrical structure. One end of the filter cylinder 51 is connected to the side wall of the crystallization vessel 1 and extends into the interior of the crystallization vessel 1. The end of the filter cylinder 51 connected to the crystallization vessel 1 is adapted to the inner wall of the crystallization vessel 1. The crystal discharge pipe 4 is connected to the bottom area of ​​the end of the filter cylinder 51 away from the crystallization vessel 1. Multiple sets of telescopic plates 52 are provided inside the filter cylinder 51. An eccentric shaft 53 is also rotatably installed inside the filter cylinder 51. The eccentric shaft 53 is driven to rotate by a first rotation driver 531 (e.g., a motor) installed outside the filter cylinder 51. The eccentric shaft 53 is set downward off-center from the central axis of the filter cylinder 51. Each telescopic plate 52 is installed on the eccentric shaft 53.

[0039] Refer to the instruction manual appendix Figure 4 The area between two adjacent telescopic plates 52 forms a crystal receiving cavity 524 within the filter cartridge 51, as shown in the attached instruction manual. Figure 3 and Figure 5The filter cylinder 51 is provided with a baffle plate 511, a filter plate 512, and a feed opening 513 in the end region corresponding to the crystallizer 1. The baffle plate 511 is fixedly installed in the lower region inside the filter cylinder 51 and is arranged corresponding to the crystal discharge tube 4. The filter plate 512 is fixedly installed inside the filter cylinder 51 and is fixedly connected to the baffle plate 511. The feed opening 513 is an empty structure without any structure. The feed opening 513 and the filter plate 512 are located on both sides above the baffle plate 511. The first rotary driver 531 is used to drive the eccentric shaft 53 to move the telescopic plate 52 from the feed opening 513 to the filter plate 512. 12. The tube moves cyclically toward the sealing plate 511, and the telescopic plate 52 slides in contact with the inner circumferential wall of the filter cylinder 51 through telescopic changes, and is relatively sealed. One end of the telescopic plate 52 slides in contact with the inner end wall of the filter cylinder 51, and is relatively sealed. When the telescopic plate 52 reaches the area of ​​the filter plate 512 or the sealing plate 511, the other end of the telescopic plate 52 slides in contact with the filter plate 512 or the sealing plate 511 respectively, and when it contacts the sealing plate 511, it forms a relative seal with the sealing plate 511. The filter plate 512 is used to filter the corresponding crystals, that is, to allow the solution to pass through while blocking the crystals.

[0040] Among them, refer to the appendix of the instruction manual Figure 4 The telescopic plate 52 is composed of a fixed plate 521 and a sliding plate 522. The fixed plate 521 is fixedly connected to the eccentric shaft 53, and the sliding plate 522 is slidably installed in the fixed plate 521. An elastic element 523 (e.g., a spring) is provided between the sliding plate 522 and the fixed plate 521. The elastic element 523 is used to provide a spring force to the sliding plate 522 in a direction away from the eccentric shaft 53, so that the sliding plate 522 can always be in contact with the inner circumference of the filter cylinder 51 and form a seal during the rotation of the telescopic plate 52 driven by the eccentric shaft 53.

[0041] In the above embodiments, due to the eccentric setting of the eccentric shaft 53 and the automatic extension and retraction of the telescopic plate 52, the size of the crystal receiving cavity 524 will also change during the rotation of the eccentric shaft 53. For example, refer to the appendix of the specification. Figure 4 In the upper region of the filter cylinder 51, the space of the crystal receiving cavity 524 is relatively large, while in the region near the crystal discharge tube 4, that is, the lower region of the filter cylinder 51, the space of the crystal receiving cavity 524 is relatively small. During actual rotation, especially during the rotation of the telescopic plate 52 from top to bottom, the space of the crystal receiving cavity 524 will gradually decrease. Please refer to the appendix of the instruction manual. Figure 3 and Figure 5In the initial state, the crystals precipitated in the crystallizing vessel 1 also enter the corresponding crystal receiving cavity 524 through the feed opening 513. By controlling the rotation of the eccentric shaft 53, the corresponding crystal receiving cavity 524 gradually enters the area covered by the filter plate 512. In the area covered by the filter plate 512, as the crystal receiving cavity 524 gradually moves downward, its space relatively decreases, thus creating relative compression of the crystals. Since the crystals cannot pass through the filter plate 512 at this time, after being compressed, the excess solution in the crystal receiving cavity 524 is squeezed back into the crystallizing vessel 1. Therefore, when the crystals follow the crystal receiving cavity 524... When the crystal reaches the area corresponding to the crystal discharge tube 4 below, a large amount of solution has been squeezed out. At the same time, when the crystal receiving cavity 524 is connected to the crystal discharge tube 4, the part that was originally in contact with the filter plate 512 has formed contact with the baffle plate 511. Therefore, the other end of the crystal receiving cavity 524 is blocked, and the solution in the crystallizer 1 will not flow to the crystal discharge tube 4. The crystals can only be discharged from the crystal discharge tube 4. The crystal discharge tube 4 is connected to the corresponding collection device, which can collect the crystals after most of the solution has been removed. This can reduce the amount of solution discharged during crystal discharge, reduce the waste of resources, and reduce a lot of workload for the subsequent processing of crystals, effectively improving production efficiency.

[0042] In addition, by controlling the rotation of the eccentric shaft 53 at intervals or by slowly controlling the continuous rotation of the eccentric shaft 53, the crystals in the crystallization vessel 1 can be effectively separated and discharged without worrying about excessive discharge of the solution in the crystallization vessel 1. This method is suitable for continuous and slow discharge, thereby improving separation efficiency.

[0043] In the above embodiments, the accompanying comparative specification is attached. Figure 4 and Figure 5When the crystals in the corresponding crystal receiving cavity 524 are discharged from the crystal discharge tube 4, the amount of material in the space of the corresponding crystal receiving cavity 524 decreases. Therefore, some gas will flow into the crystal receiving cavity 524 from the crystal collecting device connected to the crystal discharge tube 4 to avoid the formation of negative pressure and affecting the operation. At the same time, during the subsequent rotation, after the crystal receiving cavity 524 moves out of the baffle plate 511 and reaches the feed opening 513, the gas will flow into the crystallization vessel 1. To avoid the gas affecting the solution and the crystals to be extracted, the gas used for replacement in the crystal collecting device is preferably an inert gas (e.g., nitrogen). Taking lithium hexafluorophosphate as an example, its production and collection processes must be strictly isolated from air, especially the moisture and oxygen contained in the air. Therefore, the storage device is pre-filled with inert gas. In addition, a gas supply connector pipe 54 can be directly installed, which is connected to the crystal discharge pipe 4. The gas supply connector pipe 54 is connected to an inert gas source, which is used to input inert gas into the area of ​​the crystal discharge pipe 4 through the gas supply connector pipe 54, so that when the crystal receiving cavity 524 reaches the area of ​​the crystal discharge pipe 4, it exchanges with the crystal, avoiding the formation of negative pressure. The gas supply connector pipe 54 can be as shown in the attached instruction manual. Figure 3 As shown, it is directly installed on the gas supply connector pipe 54, and the inert gas source includes an input pump for conveying inert gas. Also, refer to the attached instruction manual. Figure 2 The top of the crystallization vessel 1 is also equipped with an exhaust pipe 112, which is controlled by a control valve to discharge excess gas when needed.

[0044] As the crystal receiving cavity 524 discharges the crystal and continues to rotate, it gradually moves towards the area of ​​the feed opening 513, and the space of the crystal receiving cavity 524 gradually increases. Since the crystal receiving cavity 524 is still within the area covered by the baffle plate 511, the increase in its internal space will replenish the crystal receiving cavity 524 with inert gas through the area where the crystal receiving cavity 524 is still connected to the crystal discharge tube 4, in order to maintain pressure balance, until the upper part of the corresponding crystal receiving cavity 524... As the telescopic plate 52 gradually enters the area of ​​the feed opening 513, and the lower telescopic plate 52 gradually leaves the area connected to the crystal discharge pipe 4, the crystal receiving cavity 524 is connected to the feed opening 513 and separated from the crystal discharge pipe 4. At this time, the crystals in the crystallization vessel 1 will gradually enter the crystal receiving cavity 524, and the inert gas in the crystal receiving cavity 524 will also enter the crystallization vessel 1. Therefore, while ensuring the pressure balance in the crystal receiving cavity 524, it can also ensure that the solution in the crystallization vessel 1 will not flow directly to the crystal discharge pipe 4 in large quantities.

[0045] In the above embodiment, the crystallization vessel 1 includes a cylindrical body 11, a conical shell 12 fixedly connected to the bottom of the cylindrical body 11, a spherical cavity 13 fixedly connected to the bottom of the conical shell 12, one end of the liquid inlet pipe 2 extending into the interior of the conical shell 12, and the output end of the liquid inlet pipe 2 inside the conical shell 12 is set downward, so that the input solution can flow directly to the spherical cavity 13. One end of the filter cylinder 51 is connected to the side wall of the conical shell 12 and extends into the interior of the conical shell 12, and the end of the filter cylinder 51 connected to the crystallization vessel 1 is adapted to the inner wall of the conical shell 12. The exhaust pipe 112 is fixedly installed on the top of the cylindrical body 11, and a thermometer 111 is also installed on the cylindrical body 11. The thermometer 111 is used to detect the temperature of the solution inside the cylindrical body 11.

[0046] In addition, please refer to the appendix to the instruction manual. Figure 2 The cylinder 11 is also provided with an annular pipe 31 surrounding the cylinder 11. The annular pipe 31 is connected to and communicates with the cylinder 11 through a connecting pipe. The liquid output pipe 3 is provided on the annular pipe 31. In this embodiment, the liquid input pipe 2 can be an L-shaped pipe. One end of the liquid input pipe 2 extends from the side wall of the conical shell 12, and the other end is set downward inside the conical shell 12.

[0047] Specifically, the supersaturated solution to be crystallized enters the crystallizer cavity from the bottom of the crystallizer 1 through the feed inlet pipe 2. The feed solution contains a large number of tiny crystal nuclei and solute molecules. Under the action of the external circulation pump (or natural circulation drive), the feed solution flows from bottom to top, forming a stable upward flow field. When the solution enters the spherical cap 13 and conical shell 12 regions, the flow rate decreases due to the gradual expansion of the cross-section, providing a suitable residence time and growth environment for the crystal nuclei. The solute in the solution continuously deposits on the surface of the existing crystal nuclei, promoting the gradual growth of the crystals.

[0048] As the crystal size increases, its settling velocity also increases. Under the dynamic balance between the rising liquid flow and particle settling, crystals of different sizes spontaneously distribute in the vertical direction inside the crystallization vessel 1. That is, larger particles tend to concentrate in the lower region, while smaller particles migrate upward with the liquid flow. The upper clarified liquid phase and the small crystal nuclei that have not grown sufficiently rise with the liquid flow into the equipment cylinder 11, and enter the ring pipe 31 through the connecting pipe. The ring pipe 31 acts as a buffer and flow guiding structure, so that the fluid smoothly turns and is output through the feed liquid output pipe 3, and then reintroduced into the system circulation loop, that is, returned to the front cooling / concentration unit, and becomes part of the supersaturated feed again, realizing closed-loop circulation operation, improving resource utilization and crystallization efficiency.

[0049] It should be noted that in the above embodiments, the crystals can be automatically layered. Therefore, according to the range of crystals of different sizes, corresponding crystal discharge tubes 4 and reverse filter components 5 can be set at the corresponding layers. That is, multiple sets of crystal discharge tubes 4 and reverse filter components 5 are set, and the filter plates 512 in each reverse filter component 5 are used to filter crystals of the corresponding size. Thus, while the crystal receiving cavity 524 is compressed and discharges a large amount of solution, relatively smaller crystals that do not meet the required size can also be discharged back into the crystallization vessel 1, so that they can continue to crystallize with the subsequent rising solution or reach the upper layer area and be processed by the corresponding reverse filter component 5 in the upper layer.

[0050] By adopting the above scheme, crystals can be pre-collected in stages when they are actually discharged, and the precision of the separation is higher, which further improves the processing efficiency of crystals and reduces production costs.

[0051] Furthermore, in order to improve the separation effect of smaller-sized crystals during the compression of the crystal receiving cavity 524, this embodiment further improves the above-mentioned reverse filter component 5. For details, please refer to the appendix to the specification. Figure 6 and Figure 8 A backflushing assembly 55 is provided on the end of the filter cylinder 51 away from the crystallization vessel 1. The backflushing assembly 55 includes a flow guide box 551, which is fixedly installed on the filter cylinder 51. A flow equalization net 552 is provided on the flow guide box 551 at the position corresponding to the inner cavity of the filter cylinder 51. That is, the flow equalization net 552 is a filter structure with filter holes, and the filter holes do not allow crystal particles to pass through. A clear liquid supply pipe 553 is also connected to the flow guide box 551. The clear liquid supply pipe 553 is connected to a low-saturation solution supply source. That is, the low-saturation solution is introduced into the flow guide box 551 through a corresponding pump. The solution is preferably the same as the solution introduced into the feed liquid input pipe 2, but is in a low-saturation state. Other solutions that do not affect crystallization can also be selected.

[0052] The backflushing assembly 55 is located above the area covered by the filter plate 512. Specifically, when the crystal receiving cavity 524 enters the area covered by the filter plate 512, the control guide box 551 inputs a low-saturation solution into the crystal and solution mixture in that area. Referring to the attached diagram, the smaller crystals mixed therein are flushed back into the crystallization vessel 1 (the smaller crystals can follow the flow of the low-saturation solution through the corresponding filter plate 512). As the crystal receiving cavity 524 continues to move and gradually compresses and squeezes out the desired solution, the smaller crystals can be squeezed back into the crystallization vessel 1 as much as possible, thereby further improving the accuracy of crystal separation at each stage during the graded collection of crystals.

[0053] In addition, please refer to the appendix to the instruction manual. Figure 7 and Figure 9The main purpose of the gas supply connector pipe 54 is to replenish inert gas into the crystal receiving cavity 524 that discharges the crystal. Therefore, it is only necessary to ensure that the gas supply connector pipe 54 can be connected to the crystal discharge pipe 4. So, in addition to setting the gas supply connector pipe 54 on the crystal discharge pipe 4 as described above, the gas supply connector pipe 54 can also be set directly in the bottom area of ​​the filter cylinder 51, so that the gas supply connector pipe 54 is close to the crystal discharge pipe 4. When the corresponding crystal receiving cavity 524 moves to the lower area and connects with the crystal discharge pipe 4, the crystal receiving cavity 524 can also be directly connected to the gas supply connector pipe 54. The inert gas flow input by the gas supply connector pipe 54 can be set as a high-pressure flow, and a corresponding pressure relief valve or other pressure relief structure can be set on the crystal discharge pipe 4. In this way, while ensuring that inert gas can be replenished, the high-pressure gas flow ejected by the gas supply connector pipe 54 can also blow the crystal in the crystal receiving cavity 524 at this position, thereby accelerating the crystal discharge from the crystal discharge pipe 4.

[0054] Further, please refer to the appendix to the instruction manual. Figure 10 and Figure 11 An elastic baffle 56 is provided inside the filter cylinder 51 in the area above the air supply connector pipe 54, and a storage groove is provided on the inner wall of the filter cylinder 51 at the position corresponding to the elastic baffle 56 to store the elastic baffle 56. The end of the elastic baffle 56 away from the crystal discharge pipe 4 is fixedly connected to the filter cylinder 51. The elastic baffle 56 is elastic, so when air is blown from the air supply connector pipe 54, the elastic baffle 56 can be blown open and deformed. With the fluctuating airflow, the deformation of the elastic baffle 56 will also fluctuate, thereby changing the direction of the inclined airflow guided by the elastic baffle 56, which can improve the blowing efficiency of the crystal. The fluctuating elastic baffle 56 can also break up the agglomerated crystals, making it easier for the crystals to be discharged. Moreover, when the crystals are discharged and the air supply connector pipe 54 stops supplying air, the elastic baffle 56 automatically resets, which can also provide a shielding protection effect for the pipe opening of the air supply connector pipe 54.

[0055] Refer to the instruction manual appendix Figure 11 The elastic baffle 56 is composed of a rubber strip 561 and a metal elastic sheet 562. The metal elastic sheet 562 is located on the outside of the rubber strip 561. The rubber strip 561 and the metal elastic sheet 562 are fixedly connected. The metal elastic sheet 562 and the sliding plate 522 are in frictional contact to improve the service life, improve the overall strength of the elastic baffle 56, and correspondingly improve the elasticity of the elastic baffle 56. This enhances the reset force and stability of the elastic baffle 56 when it resets. Correspondingly, by simply increasing the output airflow intensity of the air supply connector pipe 54, the elastic baffle 56 can still be blown open. Alternatively, the elasticity effect of the elastic baffle 56 and the airflow intensity of the air supply connector pipe 54 can be set according to actual needs.

[0056] Furthermore, in the above embodiments, the separation process for some crystals takes a relatively long time. Especially after long-term use of the equipment, crystal aggregates easily adhere to the inner wall of the crystallization vessel 1, which are difficult to detach. In particular, crystals accumulate and condense at the filter plate 512, which affects the performance of the reverse filtration assembly 5. Therefore, this embodiment also provides the following technical solutions, which are detailed in the appendix to the instruction manual. Figure 12 The crystallization vessel 1 is also equipped with a scraper structure 6. Specifically, scraper structures 6 are provided on the inner walls of the cylinder 11 and the conical shell 12. The scraper structure 6 slides with the inner wall of the cylinder 11 or the conical shell 12. A second rotary driver 61 is fixedly installed on the top of the cylinder 11. A scraper shaft 62 is rotatably installed inside the crystallization vessel 1. The scraper structure 6 is fixedly connected to the scraper shaft 62 through a bracket. The scraper shaft 62 is fixedly connected to the output shaft of the second rotary driver 61. Thus, the scraper structure 6 can be rotated by the second rotary driver 61. When the scraper structure 6 slides past the filter plate 512, it can effectively break up the crystals condensed on its outside and prevent the filter plate 512 from clogging. The end shapes of the filter plate 512, the baffle plate 511, and the filter cylinder 51 are preferably adapted to the side wall shape of the conical shell 12 to ensure that the scraper structure 6 can fully contact the filter plate 512.

[0057] Refer to the instruction manual appendix Figure 13 The scraper structure 6 consists of a guide plate 601 and an inclined scraper 602. The guide plate 601 is fixedly connected to the scraper shaft 62 via a bracket. The inclined scraper 602 is located at the end of the guide plate 601 opposite to its rotation direction. A receiving space is provided between the guide plate 601 and the side wall of the conical shell 12. The end of the inclined scraper 602 (i.e., the end opposite to the guide plate 601) can directly contact and slide with the conical shell 12, or refer to the appendix of the instruction manual. Figure 14 An elastic scraper 603 is fixedly connected to the end of the inclined scraper 602, so that the elastic scraper 603 slides in contact with the inner wall of the cone shell 12. In the process of the scraper structure 6 rotating, in addition to cleaning the inner wall of the cone shell 12 and the filter plate 512, the guide plate 601 can also push the crystals into the feed opening 513 when the scraper structure 6 passes through the feed opening 513, thereby accelerating the movement of the crystals into the crystal receiving cavity 524 and improving the separation efficiency of the reverse filter assembly 5.

[0058] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A novel crystallizer, comprising a crystallization vessel (1), wherein a liquid inlet pipe (2) and a crystal discharge pipe (4) are provided in the bottom region of the crystallization vessel (1), and a liquid outlet pipe (3) is provided in the top region of the crystallization vessel (1), characterized in that: A reverse filtration assembly (5) is provided between the crystal discharge tube (4) and the crystallization vessel (1); The reverse filtration assembly (5) includes a filter cylinder (51), one end of which extends into the interior of the crystallization vessel (1). The crystal discharge tube (4) is connected to the bottom area of ​​the end of the filter cylinder (51). Multiple sets of telescopic plates (52) are provided inside the filter cylinder (51). An eccentric shaft (53) is also rotatably installed inside the filter cylinder (51). The eccentric shaft (53) is offset downward from the central axis of the filter cylinder (51). Each of the telescopic plates (52) is mounted on the eccentric shaft (53). A crystal receiving cavity (524) is formed between two adjacent telescopic plates (52). The filter cylinder (51) is provided with a baffle plate (511), a filter plate (512) and a feed opening (513) in the end area corresponding to the crystallization vessel (1). The baffle plate (511) is provided with a crystal discharge tube (4). The telescopic plate (52) slides in contact with the inner circumference of the filter cylinder (51) through telescopic changes. The telescopic plate (52) also slides in contact with the filter plate (512) or the baffle plate (511).

2. The novel crystallizer according to claim 1, characterized in that: The sealing plate (511) and the filter plate (512) are both fixedly installed inside the filter cylinder (51). The feed opening (513) and the filter plate (512) are located on both sides above the sealing plate (511). The eccentric shaft (53) is driven to rotate by the first rotary driver (531). The first rotary driver (531) is used to drive the eccentric shaft (53) to drive the telescopic plate (52) to move cyclically from the feed opening (513) to the filter plate (512) and then to the sealing plate (511).

3. A novel crystallizer according to claim 2, characterized in that: The telescopic plate (52) is composed of a fixed plate (521) and a sliding plate (522). The fixed plate (521) is fixedly connected to the eccentric shaft (53), and the sliding plate (522) is slidably installed in the fixed plate (521). An elastic element (523) is provided between the sliding plate (522) and the fixed plate (521). The elastic element (523) is used to provide a spring force to the sliding plate (522) in a direction away from the eccentric shaft (53).

4. A novel crystallizer according to claim 3, characterized in that: The crystallization vessel (1) includes a cylindrical body (11), a conical shell (12) is fixedly connected to the bottom of the cylindrical body (11), a spherical cap (13) is fixedly connected to the bottom of the conical shell (12), one end of the liquid input pipe (2) extends into the interior of the conical shell (12), and the output end of the liquid input pipe (2) inside the conical shell (12) is set downwards, one end of the filter cylinder (51) is connected to the side wall of the conical shell (12) and extends into the interior of the conical shell (12), and the end of the filter cylinder (51) connected to the crystallization vessel (1) is adapted to the inner wall of the conical shell (12), and an annular pipe (31) is also provided around the cylindrical body (11) outside the cylindrical body (11), the annular pipe (31) is connected to the cylindrical body (11) and communicates with it through a connecting pipe, and the liquid output pipe (3) is set on the annular pipe (31).

5. A novel crystallizer according to claim 4, characterized in that: The reverse filter assembly (5) also includes a gas supply connector pipe (54), which is connected to the crystal discharge pipe (4). The gas supply connector pipe (54) is connected to an inert gas source, which is used to input inert gas into the area of ​​the crystal discharge pipe (4) through the gas supply connector pipe (54). The top of the crystallizer (1) is also provided with an exhaust pipe (112), which is fixedly installed on the top of the cylinder (11).

6. A novel crystallizer according to claim 5, characterized in that: A backflushing assembly (55) is provided on the end of the filter cylinder (51) away from the crystallization vessel (1). The backflushing assembly (55) includes a flow guide box (551), which is fixedly installed on the filter cylinder (51). A flow equalization net (552) is provided on the flow guide box (551) at a position corresponding to the inner cavity of the filter cylinder (51). A clear liquid supply pipe (553) is also connected to the flow guide box (551), which is connected to a low-saturation solution supply source.

7. A novel crystallizer according to claim 6, characterized in that: The gas supply connector pipe (54) is located in the bottom area of ​​the filter cylinder (51). An elastic baffle (56) is provided in the area above the gas supply connector pipe (54) inside the filter cylinder (51). A storage groove for storing the elastic baffle (56) is provided on the inner wall of the filter cylinder (51) at the position corresponding to the elastic baffle (56). The end of the elastic baffle (56) away from the crystal discharge pipe (4) is fixedly connected to the filter cylinder (51).

8. A novel crystallizer according to claim 7, characterized in that: The elastic baffle (56) is composed of a rubber strip (561) and a metal elastic sheet (562). The metal elastic sheet (562) is located outside the rubber strip (561), and the rubber strip (561) and the metal elastic sheet (562) are fixedly connected.

9. A novel crystallizer according to claim 8, characterized in that: The crystallization vessel (1) is also provided with a scraper structure (6), which slides with the inner wall of the cylinder (11) or the conical shell (12). A second rotary driver (61) is fixedly installed on the top of the cylinder (11). A scraper shaft (62) is rotatably provided inside the crystallization vessel (1). The scraper structure (6) is fixedly connected to the scraper shaft (62) through a bracket. The scraper shaft (62) is fixedly connected to the output shaft of the second rotary driver (61).

10. A novel crystallizer according to claim 9, characterized in that: The scraper structure (6) consists of a guide plate (601) and an inclined scraper (602). The guide plate (601) is fixedly connected to the scraper shaft (62) via a bracket. The inclined scraper (602) is located at the end of the guide plate (601) opposite to its rotation direction. A receiving space is provided between the guide plate (601) and the side wall of the cone shell (12). An elastic scraper (603) is fixedly connected to the end of the inclined scraper (602). The elastic scraper (603) slides in contact with the inner wall of the cone shell (12).

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