A crystallization tank and evaporation anti-blocking process

Abstract

The present application relates to the technical field of wastewater treatment, and in particular to a crystallization tank and evaporation anti-blocking process, comprising a main body, a feed pipe, a discharge pipe, a stirring mechanism, and a heating mechanism. The main body is provided with a processing chamber, the feed pipe is arranged on the main body and communicates with the processing chamber, the discharge pipe is arranged on the main body and communicates with the processing chamber, the stirring mechanism is arranged on the main body, and the heating mechanism is arranged on the main body; the main body is provided with a dosing device, the dosing device includes a dosing pipe and a connecting block, the dosing pipe is arranged on the main body; the connecting block is arranged in the main body, a transfer chamber is arranged on the connecting block, a drug outlet is arranged on the connecting block that communicates the transfer chamber with the processing chamber; the dosing pipe is connected to the connecting block and communicates with the transfer chamber. The present application has the effect of improving efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of wastewater treatment, and in particular to a crystallization tank and an evaporation anti-blocking process. Background Art

[0002] High calcium content in the original solution. Usually, if the calcium ion content in the evaporation water exceeds 600 mg / L, there will be a significant risk of scaling. If the inlet water concentration is low and the concentration ratio in the evaporator is high, scaling will still occur after using traditional double alkali de-hardening.

[0003] Currently, a Chinese patent with authorization announcement number CN207270752U discloses a crystallization tank, comprising a tank body, an inner wall of which is provided with a hot steam main pipe, a hot steam auxiliary pipe provided on one side of the hot steam main pipe, a stirring rod provided on one side of the stirring rod, a first stirring fan provided above the stirring rod, a second stirring fan provided on one side of the first stirring fan, an auxiliary heat conduction pipe provided on one side of the second stirring fan, a cover heat conduction pipe provided on one side of the auxiliary heat conduction pipe, a sealing plug provided on one side of the cover heat conduction pipe, a discharge port provided at the bottom of the tank body, a preheating pipe provided on one side of the discharge port, and a feed port provided on one side of the tank body.

[0004] In the process of implementing this application, the inventors found that there are at least the following problems in this technology: the raw liquid enters the tank body through the liquid inlet, and the reagent that reacts with the raw liquid also enters the tank body through the liquid inlet. At this time, it is necessary to switch the raw liquid tube connected to the liquid inlet and the reagent tube to which the reagent needs to be added. In order to maintain the sealing, the switching time will become longer, resulting in relatively low efficiency. Summary of the Invention

[0005] In order to improve efficiency, the present application provides a crystallization tank and an evaporation anti-blocking process.

[0006] In the first aspect, the present application provides a crystallization tank, which adopts the following technical solution:

[0007] A crystallization tank comprises a main body, a feed pipe, a discharge pipe, a stirring mechanism and a heating mechanism, wherein a processing chamber is provided on the main body, the feed pipe is arranged on the main body and communicates with the processing chamber, the discharge pipe is arranged on the main body and communicates with the processing chamber, the stirring mechanism is arranged on the main body, and the heating mechanism is arranged on the main body; a dosing device is provided on the main body, the dosing device comprises a dosing pipe and a connecting block, the dosing pipe is provided on the main body; the connecting block is arranged in the main body, a transfer chamber is provided on the connecting block, and a drug outlet communicating with the transfer chamber and the processing chamber is provided on the connecting block; the dosing pipe is connected to the connecting block and communicates with the transfer chamber.

[0008] By adopting the above technical solution, the raw liquid enters the processing cavity of the main body through the feed pipe, the reagent enters the transfer cavity of the connecting block through the dosing pipe, and then flows into the processing cavity through the discharge port; when the stirring mechanism is started, the stirring mechanism will stir the raw liquid and the reagent, and the provided heating mechanism can accelerate the reaction between the reagent and the raw liquid; the provided dosing device can reduce the switching time, thereby improving the dosing efficiency.

[0009] Optionally, a first blocking mechanism is provided on the connecting block, and the first blocking mechanism includes a first blocking block, a moving block and a first adjusting component, and the moving block is slidingly provided on the connecting block; the first blocking block is provided on the moving block and can block the medicine outlet; the first adjusting component is provided on the connecting block and is connected to the moving block.

[0010] By adopting the above technical solution, the first regulating component is started, the first regulating component drives the moving block to move, the moving block drives the first blocking block to move, and the first blocking block will block the medicine outlet.

[0011] Optionally, a second blocking mechanism is provided on the connecting block, and the second blocking mechanism includes a rotating block, a lifting block, a second blocking block, a second adjusting assembly and a third adjusting assembly, and the rotating block is rotatably set on the connecting block through the second adjusting assembly; the lifting block is slidably set on the rotating block; the second blocking block is set on the lifting block, and a medicine outlet hole is opened on the second blocking block, and the medicine outlet hole can be connected to any one of the medicine outlets; the third adjusting assembly includes a first motor, a first gear and a first rack, the first motor is set on the rotating block, the first gear key is connected to the output shaft of the first motor, and the first rack is set on the lifting block and meshes with the first gear.

[0012] By adopting the above technical solution, when only one of the medicine outlets is needed to flow out the medicine, the second adjusting component is started first, the second adjusting component drives the rotating block to rotate, the rotating block drives the lifting block to rotate, and the lifting block drives the second blocking block to rotate, so that the axis of the medicine outlet on the second blocking block and the axis of the medicine outlet that needs to flow out are located in the same vertical plane; then the first motor is started, the output shaft of the first motor drives the first gear to rotate, the first rack engaged with the first gear drives the lifting block to move relative to the rotating block, and the lifting block drives the second blocking block to move, so that the medicine outlet on the second blocking block and the medicine outlet that needs to flow out are connected, and the second blocking block blocks the other medicine outlets; therefore, the second blocking block can be set to add medicine at different positions as needed, thereby improving the scope of application.

[0013] Optionally, a dredging mechanism is provided on the connecting block, and the dredging mechanism includes a movable block, a telescopic rod, a fixed block, a dredging block, a spring and a first adjustment assembly, the movable block slides on the connecting block, one end of the telescopic rod is connected to the movable block and the other end is connected to the lifting block; the fixed block is provided on the movable block, and a first groove is provided on the fixed block, and the dredging block is slidably provided in the first groove, and one end of the dredging block can pass through the medicine outlet and the medicine outlet hole; the spring connects the fixed block and the dredging block; the first adjustment assembly is provided on the fixed block, and the dredging block and the lifting block are both connected to the first adjustment assembly.

[0014] By adopting the above technical solution, when the rotating block drives the lifting block to move, causing the second blocking block to move and adjust the position of the medicine outlet hole, the telescopic rod on the lifting block drives the movable block to move relative to the connecting block; when the lifting block moves relative to the rotating block, the lifting block will drive the dredging block to move through the first adjustment component, and the end of the dredging block away from the fixed block will pass through the medicine outlet on the connecting block and the medicine outlet hole on the second blocking block and be located in the processing chamber; the set dredging mechanism can dredge the blocked medicine outlet hole.

[0015] Optionally, the first adjustment assembly includes a drive shaft, a second gear, a third gear and a second rack, the drive shaft is rotatably set on the fixed block, the second gear key is connected to the drive shaft and meshes with the first rack; the third gear key is connected to the drive shaft, the second rack is set on the dredging block and meshes with the third gear.

[0016] By adopting the above technical solution, when the lifting block moves, the first rack on the lifting block will drive the second gear to rotate, the second gear will drive the drive shaft to rotate, the third gear on the drive shaft will drive the second rack to move, and the second rack will drive the dredging block to move, so that the dredging block can move relative to the fixed block.

[0017] Optionally, a third sealing mechanism is provided on the second sealing block, and the third sealing mechanism includes a rotating shaft, a sealing plate and a second adjustment component. The rotating shaft is rotatably set on the second sealing block, the sealing plate is set on the rotating shaft, and the sealing plate can block the medicine outlet hole; the second adjustment component is set on the second sealing block, and the rotating shaft and the lifting block are both connected to the second adjustment component.

[0018] By adopting the above technical solution, when the lifting block moves relative to the rotating block, the lifting block drives the rotating shaft through the second adjustment component, and the rotating shaft drives the blocking plate to rotate, so that the blocking plate can block or expose the medicine outlet hole.

[0019] Optionally, the second adjustment assembly includes a fourth gear, a fifth gear and a sixth gear, the fourth gear being rotatably set on the second blocking block and meshing with the first rack; the fifth gear being rotatably set on the second blocking block and meshing with the fourth gear; the sixth gear key is connected to the rotating shaft and meshes with the fifth gear.

[0020] By adopting the above technical solution, the first rack on the lifting block drives the fourth gear to rotate, the fifth gear engaged with the fourth gear drives the sixth gear to rotate, the sixth gear drives the rotating shaft to rotate, and the rotating shaft drives the blocking plate to move.

[0021] In a second aspect, the present application provides an evaporation anti-blocking process, which adopts the following technical solutions:

[0022] An evaporation anti-blocking process comprises the following steps: S1: preheating the raw liquid and then supplying it into a main body; S2: adding sodium hydroxide and sodium carbonate double alkali reagents into the main body through a dosing pipe to react and form a mixed liquid; S3: circulating the mixed liquid in the main body through a circulation component; S4: supplying the circulated mixed liquid to an evaporation device.

[0023] By adopting the above technical solution, the heated stock solution is first preheated, and then the preheated stock solution is added to the main body. Then, sodium hydroxide and sodium carbonate double alkali reagents are added to the main body for reaction to form a mixed solution; the mixed solution is then circulated through a circulation component; finally, the circulated mixed solution is supplied to the evaporation equipment for reaction; based on the low solubility characteristics of calcium carbonate, sodium carbonate is added to the stock solution to preferentially generate calcium carbonate crystals, which are then circulated and the newly generated calcium carbonate in the concentration process is allowed to adhere to the crystal surface, thereby reducing the phenomenon of scaling of the subsequent evaporation equipment leading to clogging of the evaporation equipment.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. The dosing device can reduce the switching time, thereby improving the dosing efficiency;

[0026] 2. The second blocking block can be used to add agents at different positions as needed, thereby increasing the scope of application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the structure of the crystallization tank in the embodiment of the present application;

[0028] Figure 2 This is a schematic structural diagram of a dosing device in an embodiment of the present application;

[0029] Figure 3 This is a structural diagram of the first blocking mechanism in an embodiment of the present application;

[0030] Figure 4 This is a schematic structural diagram of the first adjustment component in an embodiment of the present application;

[0031] Figure 5 This is a schematic structural diagram of the second adjustment component in an embodiment of the present application;

[0032] Figure 6 This is a structural diagram of the third blocking mechanism in an embodiment of the present application.

[0033] Figure numerals: 11, main body; 12, feed pipe; 13, discharge pipe; 14, stirring mechanism; 141, second motor; 142, stirring shaft; 143, stirring blade; 2, dosing device; 21, dosing pipe; 22, connecting block; 221, transfer chamber; 222, discharge port; 3, first blocking mechanism; 31, moving block; 32, first blocking block; 33, first adjusting assembly; 331, third motor; 332, seventh gear; 333, third rack; 4, second blocking mechanism; 41, rotating block; 42, lifting block; 43, second blocking block; 431, discharge port; 44, second adjusting assembly; 441, fourth motor ;442, the eighth gear; 443, the fourth rack; 45, the third adjusting assembly; 451, the first motor; 452, the first gear; 453, the first rack; 5, the dredging mechanism; 51, the movable block; 52, the telescopic rod; 521, the main rod; 522, the auxiliary rod; 53, the fixed block; 54, the dredging block; 55, the first adjusting assembly; 551, the driving shaft; 552, the second gear; 553, the third gear; 554, the second rack; 56, the supporting rod; 6, the third blocking mechanism; 61, the rotating shaft; 62, the blocking plate; 63, the second adjusting assembly; 631, the fourth gear; 632, the fifth gear; 633, the sixth gear. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1-5 This application is described in further detail.

[0035] The embodiment of the present application discloses a crystallization tank.

[0036] refer to Figure 1 A crystallization tank includes a main body 11, which is provided with a processing chamber; a feed pipe 12 communicating with the processing chamber is fixedly connected to the upper end of the main body 11; a discharge pipe 13 communicating with the processing chamber is fixedly connected to the lower end of the main body 11; a heating mechanism is provided in the processing chamber of the main body 11, and the heating mechanism is a heating coil in this embodiment; a stirring mechanism 14 and a dosing device 2 are provided on the main body 11.

[0037] refer to Figure 1 and Figure 2The stirring mechanism 14 includes a second motor 141 fixedly connected to the upper end of the main body 11; a stirring shaft 142 is rotatably connected to the main body 11, the stirring shaft 142 is located in the processing chamber and is connected to the output shaft of the second motor 141; a stirring blade 143 is fixedly connected to the stirring shaft 142.

[0038] When the second motor 141 is started, the output shaft of the second motor 141 drives the stirring shaft 142 to rotate, and the stirring shaft 142 drives the stirring blade 143 to rotate.

[0039] refer to Figure 1 and Figure 2 The dosing device 2 includes a dosing tube 21 fixedly connected to the outer wall of the main body 11; a connecting block 22 is fixedly connected to the main body 11, and the connecting block 22 is located in the processing chamber; the connecting block 22 is annular, and a transfer chamber 221 is provided on the connecting block 22, and the dosing tube 21 is connected to the connecting block 22 and communicated with the transfer chamber 221; a plurality of drug outlets 222 communicated with the transfer chamber 221 are provided on the side of the connecting block 22 away from the main body 11, and the drug outlets 222 are also communicated with the processing chamber.

[0040] The medicine enters the transfer chamber 221 of the connecting block 22 through the medicine adding pipe 21 and then flows into the processing chamber through the medicine outlet 222 .

[0041] refer to Figure 2 、 Figure 3 and Figure 4 A first blocking mechanism 3 is provided on the connecting block 22, and the first blocking mechanism 3 includes a moving block 31 slidingly connected to the connecting block 22, and the moving block 31 is located in the transfer cavity 221; a plurality of first blocking blocks 32 are integrally provided on the moving block 31, and the first blocking blocks 32 correspond one-to-one to the drug outlet 222, and the first blocking blocks 32 can block the drug outlet 222.

[0042] A first adjustment component 33 is provided on the connecting block 22, and the first adjustment component 33 includes a third motor 331 fixedly connected to the connecting block 22, and a seventh gear 332 is keyed to the output shaft of the third motor 331; a third rack 333 engaged with the seventh gear 332 is fixedly connected to the moving block 31.

[0043] Start the third motor 331, the output shaft of the third motor 331 drives the seventh gear 332 to rotate, the seventh gear 332 drives the third rack 333 to rotate, the third rack 333 drives the moving block 31 to move, and the moving block 31 will drive the first blocking block 32 to move, so that the first blocking block 32 can block the medicine outlet 222.

[0044] refer to Figure 2 、 Figure 3 and Figure 5The connecting block 22 is provided with a second blocking mechanism 4, which includes a rotating block 41 rotatably connected to the connecting block 22, a lifting block 42 slidably connected to the rotating block 41, and a second blocking block 43 fixedly connected to the lifting block 42. The second blocking block 43 is capable of blocking all drug outlets 222, and a drug outlet hole 431 is formed in the second blocking block 43, which can communicate with any drug outlet 222. The connecting block 22 is provided with a second adjustment assembly 44 connected to the rotating block 41, and the second adjustment assembly 44 includes a fourth motor 441 fixedly connected to the connecting block 22, and an eighth gear 442 is keyed to the output shaft of the fourth motor 441; and a fourth rack 443 is fixedly connected to the rotating block 41 and meshes with the eighth gear 442.

[0045] refer to Figure 3 and Figure 6 A third adjusting assembly 45 connected to the lifting block 42 is provided on the rotating block 41. The third adjusting assembly 45 includes a first motor 451 fixedly connected to the rotating block 41. A first gear 452 is keyed to the output shaft of the first motor 451; a first rack 453 meshing with a first rack 453 is fixedly connected to the lifting block 42.

[0046] When only one of the drug outlets 222 is required to flow out medicine, the fourth motor 441 is first started. The output shaft of the fourth motor 441 drives the eighth gear 442 to rotate, the eighth gear 442 drives the fourth rack 443 to rotate, the fourth rack 443 drives the rotating block 41 to rotate, the rotating block 41 drives the lifting block 42 to rotate, and the lifting block 42 drives the second blocking block 43 to rotate, so that the axis of the drug outlet 431 on the second blocking block 43 and the axis of the drug outlet 222 from which the medicine is to flow out are located in the same vertical plane. Then, the first motor 451 is started. The output shaft of the first motor 451 drives the first gear 452 to rotate, the first gear 452 drives the first rack 453 to move, the first rack 453 drives the lifting block 42 to move relative to the rotating block 41, and the lifting block 42 drives the second blocking block 43 to move, so that the drug outlet 431 on the second blocking block 43 is connected to the drug outlet 222 from which the medicine is to flow out, and the second blocking block 43 blocks the other drug outlets 222.

[0047] refer to Figure 2 、 Figure 3 and Figure 6The connecting block 22 is provided with a dredging mechanism 5, which includes a movable block 51 slidably connected to the connecting block 22, a telescopic rod 52 provided on the movable block 51, and a main rod 521 fixedly connected to the movable block 51. A second groove is provided at the end of the main rod 521 away from the movable block 51, and a secondary rod 522 is slidably connected in the second groove. The end of the secondary rod 522 away from the movable block 51 is fixedly connected to the lifting block 42. A support rod 56 is fixedly connected to the movable block 51, and a fixed block 53 is fixedly connected at the end of the support rod 56 away from the movable block 51. The fixed block 53 is provided with a first groove, and a dredging block 54 is slidably connected in the first groove. The dredging block 54 can pass through the drug outlet 222 on the connecting block 22 and the drug outlet hole 431 on the second blocking block 43; a spring is provided in the first groove, one end of the spring is connected to the dredging block 54 and the other end is connected to the fixed block 53.

[0048] A first adjustment assembly 55 is provided on the fixed block 53, and the first adjustment assembly 55 includes a drive shaft 551 rotatably connected to the connecting block 22, and one end of the drive shaft 551 is keyed to a second gear 552 meshing with the first rack 453; one end of the drive shaft 551 away from the second gear 552 is keyed to a third gear 553, and a second rack 554 meshing with the third gear 553 is integrally provided on the dredging block 54.

[0049] When the lifting block 42 on the rotating block 41 adjusts the position of the medicine outlet hole 431 on the second blocking block 43, the auxiliary rod 522 on the lifting block 42 will drive the main rod 521 to move, and the main rod 521 drives the movable block 51 to move relative to the connecting block 22; when the lifting block 42 moves relative to the rotating block 41, the auxiliary rod 522 will slide in the second groove of the main rod 521; and the first rack 453 on the lifting block 42 will drive the second gear 552 to rotate, the second gear 552 drives the driving shaft 551 to rotate, the driving shaft 551 drives the third gear 553 to rotate, the third gear 553 drives the second rack 554 to move, and the second rack 554 will drive the dredging block 54 to move, and the end of the dredging block 54 away from the fixed block 53 will pass through the medicine outlet 222 on the connecting block 22 and the medicine outlet hole 431 on the second blocking block 43 and be located in the processing cavity.

[0050] refer to Figure 2 and Figure 6The second blocking block 43 is provided with a third blocking mechanism 6, which includes a rotating shaft 61 rotatably connected to the second blocking block 43. A blocking plate 62 is fixedly connected to the rotating shaft 61 and is capable of blocking the medicine outlet 431. The second blocking block 43 is provided with a second adjustment assembly 63. The second adjustment assembly 63 includes a fourth gear 631 rotatably connected to the second blocking block 43 and meshing with the first rack 453. A fifth gear 632 is rotatably connected to the second blocking block 43 and meshing with the fourth gear 631. A sixth gear 633 is keyed to the rotating shaft 61 and meshed with the fifth gear 632.

[0051] When the first rack 453 on the lifting block 42 moves, the first rack 453 drives the fourth gear 631 to rotate, the fourth gear 631 drives the fifth gear 632 to rotate, the fifth gear 632 drives the sixth gear 633 to rotate, and the sixth gear 633 drives the rotating shaft 61 to rotate, and the rotating shaft 61 drives the blocking plate 62 to rotate.

[0052] The implementation principle of a crystallization tank in an embodiment of the present application is: first start the third motor 331 so that the first blocking block 32 no longer blocks the drug outlet 222; then allow the medicine to enter the transfer cavity 221 of the connecting block 22 through the dosing tube 21, and then pass through the drug outlet 222 in the processing cavity.

[0053] When it is necessary to add the medicine to a certain position in the processing chamber, first start the fourth motor 441 so that the axis of the medicine outlet 431 on the second blocking block 43 and the axis of the medicine outlet 222 from which the medicine needs to flow out are located in the same vertical plane; then start the first motor 451 so that the medicine outlet 431 on the second blocking block 43 is connected to the medicine outlet 222 from which the medicine needs to flow out, and the second blocking block 43 blocks the other medicine outlets 222.

[0054] When the lifting block 42 moves, so that the medicine outlet 431 on the second blocking block 43 is connected to the medicine outlet 222 where the medicine needs to flow out, the first rack 453 on the lifting block 42 drives the fourth gear 631 to rotate, and the fifth gear 632 engaged with the fourth gear 631 will drive the sixth gear 633 to rotate, and the sixth gear 633 drives the rotating shaft 61 to rotate, and the rotating shaft 61 drives the blocking plate 62 to move, so that the blocking plate 62 no longer blocks the medicine outlet 431; the first rack 453 on the lifting block 42 drives the second gear 552 to rotate, and the second gear 552 drives the driving shaft 551 to rotate, and the third gear 553 on the driving shaft 551 drives the second rack 554 to move, and the second rack 554 drives the dredging block 54 to move, so that the end of the dredging block 54 away from the fixed block 53 passes through the medicine outlet 222 on the connecting block 22 and the medicine outlet 431 on the second blocking block 43 and is located in the processing chamber.

[0055] The embodiments of the present application disclose an evaporation anti-blocking process.

[0056] An evaporation anti-blocking process includes the following steps: S1: the raw liquid is preheated and then supplied to the main body 11 through the feeding pipe 12.

[0057] S2: Then, sodium hydroxide and sodium carbonate double alkali reagents are added into the main body 11 through the dosing pipe 21 to react to form a mixed solution. Calcium carbonate crystals generated by the reaction will exist in the mixed solution, and the pH of the mixed solution is adjusted to between 8.5 and 9.0.

[0058] S3: The mixed liquid in the main body 11 is circulated through a circulation assembly. The circulation assembly includes a circulation box equipped with a power pump. Both ends of the circulation box are provided with connecting pipes to the main body 11. The mixed liquid in the main body 11 enters the circulation box through one connecting pipe and then flows back into the main body 11 through the other connecting pipe. Newly produced calcium carbonate then adheres to the surface of the crystals.

[0059] S4: The circulated mixed liquid is supplied to the MVR evaporator for treatment.

[0060] 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. A crystallization tank, comprising a main body (11), a feed pipe (12), a discharge pipe (13), a stirring mechanism (14) and a heating mechanism, wherein a processing chamber is provided on the main body (11), the feed pipe (12) is arranged on the main body (11) and communicates with the processing chamber, the discharge pipe (13) is arranged on the main body (11) and communicates with the processing chamber, the stirring mechanism (14) is arranged on the main body (11), and the heating mechanism is arranged on the main body (11); It is characterized by: A dosing device (2) is provided on the main body (11), the dosing device (2) comprises a dosing tube (21) and a connecting block (22), and the dosing tube (21) is provided on the main body (11); The connecting block (22) is arranged in the main body (11); a transfer cavity (221) is provided on the connecting block (22); and a drug outlet (222) is provided on the connecting block (22) for communicating with the transfer cavity (221) and the processing cavity; the drug adding pipe (21) is in communication with the connecting block (22) and the transfer cavity (221); The connecting block (22) is provided with a first blocking mechanism (3), the first blocking mechanism (3) comprising a first blocking block (32), a moving block (31) and a first adjusting component (33). The moving block (31) is slidably arranged on the connecting block (22); The first blocking block (32) is arranged on the moving block (31) and is capable of blocking the medicine outlet (222); The first adjustment component (33) is arranged on the connecting block (22) and connected to the moving block (31); The connecting block (22) is provided with a second blocking mechanism (4), the second blocking mechanism (4) comprising a rotating block (41), a lifting block (42), a second blocking block (43), a second adjusting component (44) and a third adjusting component (45). The rotating block (41) is rotatably arranged on the connecting block (22) via the second adjusting component (44); The lifting block (42) is slidably arranged on the rotating block (41); The second blocking block (43) is arranged on the lifting block (42), and a medicine outlet hole (431) is provided on the second blocking block (43), and the medicine outlet hole (431) can be communicated with any one of the medicine outlets (222); The third adjustment component (45) includes a first motor (451), a first gear (452) and a first rack (453). The first motor (451) is arranged on the rotating block (41), the first gear (452) is key-connected to the output shaft of the first motor (451), and the first rack (453) is arranged on the lifting block (42) and meshes with the first gear (452); The connecting block (22) is provided with a dredging mechanism (5), and the dredging mechanism (5) comprises a movable block (51), a telescopic rod (52), a fixed block (53), a dredging block (54), a spring and a first adjustment component (55). The movable block (51) slides on the connecting block (22), one end of the telescopic rod (52) is connected to the movable block (51) and the other end is connected to the lifting block (42); The fixed block (53) is arranged on the movable block (51), and a first groove is formed on the fixed block (53). The dredging block (54) is slidably arranged in the first groove, and one end of the dredging block (54) can pass through the medicine outlet (222) and the medicine outlet hole (431); the spring connects the fixed block (53) and the dredging block (54); The first adjustment component (55) is arranged on the fixed block (53), and the dredging block (54) and the lifting block (42) are both connected to the first adjustment component (55).

2. A crystallization tank according to claim 1, characterized in that, The first adjustment assembly (55) includes a drive shaft (551), a second gear (552), a third gear (553) and a second rack (554). The driving shaft (551) is rotatably mounted on the fixed block (53); the second gear (552) is key-connected to the driving shaft (551) and meshes with the first rack (453); The third gear (553) is key-connected to the drive shaft (551), and the second rack (554) is provided on the dredging block (54) and meshes with the third gear (553).

3. A crystallization tank according to claim 1, characterized in that, A third blocking mechanism (6) is provided on the second blocking block (43), and the third blocking mechanism (6) comprises a rotating shaft (61), a blocking plate (62) and a second adjustment assembly (63). The rotating shaft (61) is rotatably disposed on the second blocking block (43), the blocking plate (62) is disposed on the rotating shaft (61), and the blocking plate (62) is capable of blocking the medicine outlet hole (431); The second adjustment component (63) is arranged on the second blocking block (43), and the rotating shaft (61) and the lifting block (42) are both connected to the second adjustment component (63).

4. A crystallization tank according to claim 3, characterized in that, The second adjustment assembly (63) comprises a fourth gear (631), a fifth gear (632) and a sixth gear (633); the fourth gear (631) is rotatably disposed on the second blocking block (43) and meshes with the first rack (453); The fifth gear (632) is rotatably disposed on the second blocking block (43) and meshes with the fourth gear (631); The sixth gear (633) is key-connected to the rotating shaft (61) and meshes with the fifth gear (632).

5. An evaporation anti-blocking process, characterized in that: The following steps are involved: S1: The raw liquid is preheated and then supplied into the main body (11) of the crystallization tank as claimed in claim 1; S2: adding sodium hydroxide and sodium carbonate into the main body (11) through the dosing tube (21) to react and form a mixed solution; S3: circulating the mixed liquid in the main body (11) through the circulation component; S4: The circulated mixed liquid is supplied to the evaporation equipment.

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