Crystallization device and crystallization circulation equipment

Abstract

The utility model provides a crystallization device and crystallization circulation equipment, and relates to the technical field of crystallization. The crystallization device comprises a body, a center cylinder, a flow guide cylinder, a stirring mechanism and a liquid outlet assembly, the body comprises a deposition part, a flow guide part and an overflow part, the flow guide part is arranged between the deposition part and the overflow part, the deposition part is of an arc-shaped structure, the overflow part is of a cylindrical structure, the flow guide part is of a gradually-shrinking structure, and the small opening end of the flow guide part faces the deposition part; the central cylinder is arranged in the body, and a dissolving and crystallizing area is arranged in the central cylinder; the guide cylinder is arranged in the body and is sleeved outside the central cylinder; and the dissolving and crystallizing region is communicated with the crystal growing region through the guide cylinder. The liquid outlet assembly is configured to output dissolving liquid and size mixing mother liquid into the dissolving and crystallizing area, and the stirring mechanism can rotate relative to the body, so that the dissolving liquid and the size mixing mother liquid are located in the dissolving and crystallizing area, and ore subjected to dissolving and crystallizing is conveyed to the crystal growing area and used for growing crystals in the crystal growing area.

Description

Technical Field

[0001] The utility model generally relates to the field of crystallization technology, and in particular to a crystallization device and a crystallization circulation device. Background Art

[0002] Industrial crystallization is a method commonly used in industries such as pharmaceuticals, food processing, and environmental protection. It involves modifying external environmental factors to induce crystallization of substances from solution. For example, in pharmaceutical production, lowering temperature and pressure reduces the solubility of a solute, causing it to crystallize from the solution. In the environmental protection industry, heating and evaporation are used to reduce solvent consumption, thereby promoting crystallization and removing harmful substances from the solution.

[0003] Among them, the existing carnallite is used to produce potash fertilizer through the dissolution and crystallization of carnallite. Potash fertilizer production is a large-scale industrial production. Due to cost control, it can only be produced at room temperature. The raw materials for production are mixed crystals of various salts. According to the solubility differences of different salts, the high-solubility components are dissolved and the low-solubility salts are precipitated from the liquid phase to complete the crystallization process.

[0004] In existing crystallization equipment, ore raw materials are mixed with solutions such as slurry mother liquor, refined potassium mother liquor, and fresh water in predetermined proportions. During actual production operations, some raw materials often enter the crystallization equipment discharge area before being fully dissolved. This incomplete dissolution of raw materials affects key indicators such as flotation froth grade and yield, leading to increased production costs and reduced output. Existing crystallization equipment generally cannot effectively dissolve and crystallize high-sodium carnallite. This phenomenon is primarily due to the following: 1) High-sodium carnallite is typically mined underground and often contains large amounts of halite and small amounts of sylvite. Sylvite is more difficult to dissolve than carnallite, resulting in different crystallization feed properties and limited adaptability of existing crystallization equipment. 2) After dissolution, high-sodium carnallite contains a high proportion of solid sodium chloride in the slurry, resulting in fine particle size and a tendency to agglomerate with fine KCl particles, compromising subsequent washing. This requires a prolonged crystallization time to achieve effective growth of potassium chloride. 3) The excessive amount of fine potassium chloride crystals produced by dissolving and crystallizing creates an excessive number of crystal nuclei, which can affect the particle size distribution of the final potassium chloride product. 4) The conventional crystallization device has design defects, resulting in an unreasonable flow field, which is prone to problems such as material accumulation and uneven material distribution.

[0005] The existing method of directly using pipes to flow from top to bottom to the stirring mechanism will greatly weaken the effectiveness of the axial force of the stirring mechanism, accelerate the sinking of crystal particles, and affect the dissolution efficiency. In addition, in large-scale production processes, especially under high-sodium carnallite conditions, maintaining effective crystal growth is a major challenge. Due to factors such as the large amount of fine crystals, insufficient crystal growth time, and untimely regulation of the dissolution and slurry adjustment mother liquor when the ore grade fluctuates, potassium chloride crystals will be too fine, and there will be problems with crystal quality control. At the same time, dissolution and crystallization occur synchronously inside the crystallization device. In order to control the particle size of potassium chloride crystals, rate-controlled crystallization is required. Improper speed control will cause crystal explosion or incomplete dissolution of the raw materials, resulting in problems with dissolution efficiency control. Utility Model Content

[0006] The utility model provides a crystallization device and crystallization circulation equipment, which can improve the dissolution crystallization effect.

[0007] According to a first aspect of the present invention, there is provided a crystallization device comprising:

[0008] The body includes a deposition portion, a guide portion, and an overflow portion. The guide portion is disposed between the deposition portion and the overflow portion. The deposition portion is an arc-shaped structure. The guide portion is a tapered structure. The small end of the guide portion is disposed toward the deposition portion. The overflow portion is a cylindrical structure.

[0009] A central tube is provided in the main body, wherein a dissolution and crystallization area is provided in the central tube;

[0010] A stirring mechanism is arranged in the central cylinder;

[0011] a liquid outlet component, the liquid outlet component being arranged corresponding to the stirring mechanism;

[0012] a guide tube disposed in the body and sleeved on the outside of the central tube; a crystal growth zone is provided between the central tube, the guide tube and the body; the dissolution and crystallization zone is connected to the crystal growth zone through the guide tube;

[0013] Among them, along the axial direction of the main body, the liquid outlet component is configured to output the dissolving liquid and the slurry mother liquor into the dissolving and crystallizing zone, and the stirring mechanism can rotate relative to the main body so that the dissolving liquid and the slurry mother liquor are mixed with the ore in the dissolving and crystallizing zone and dissolved and crystallized, and then the ore after dissolution and crystallization is transported to the crystal growth zone for growing crystals in the crystal growth zone.

[0014] In some embodiments, the central tube is a cylindrical structure.

[0015] In some embodiments, along the axial direction of the body, at least one end of the central tube is provided with a first open end, and the dissolution and crystallization zone is connected to the crystal growth zone through the first open end.

[0016] In some embodiments, the guide tube is a cylindrical structure.

[0017] In some embodiments, along the axial direction of the body, at least one end of the guide tube is provided with a second open end, so that the guide tube is connected to the dissolution crystallization zone and / or the crystal growth zone through the second open end.

[0018] In some embodiments, along the axial direction of the body, the height of the guide tube is smaller than the height of the central tube.

[0019] In some embodiments, the stirring mechanism includes a stirring paddle, and along the axial direction of the body and away from the stirring paddle of the stirring mechanism, the second open end of the guide tube is higher than the first open end of the central tube;

[0020] And / or, along the axial direction of the body and in a direction close to the stirring mechanism, the second open end of the guide tube is higher than the first open end of the central tube.

[0021] In some embodiments, the stirring mechanism includes a stirring paddle, and the stirring paddle is rotatably disposed in the dissolution and crystallization zone;

[0022] The liquid outlet assembly is configured to output the dissolved liquid and the slurry mixing mother liquid respectively in a direction away from the stirring paddle, so that the output directions of the dissolved liquid and the slurry mixing mother liquid are the same as the directions in which the dissolved liquid and the slurry mixing mother liquid are guided by the stirring paddle;

[0023] The liquid outlet component comprises:

[0024] a first liquid outlet pipeline, for outputting the dissolved liquid in a direction away from the stirring mechanism;

[0025] The second liquid outlet pipeline is arranged in parallel with the first liquid outlet pipeline and spaced apart from each other, and is used to output the slurry mixing mother liquid in a direction away from the stirring mechanism.

[0026] In some embodiments, the first liquid outlet pipe is a first annular structure, the first liquid outlet pipe is provided with a plurality of first liquid outlet holes along the circumferential direction of the body, and the stirring mechanism is provided through the first annular structure;

[0027] And / or, the second liquid outlet pipeline is a second annular structure, the second liquid outlet pipe is provided with a plurality of second liquid outlet holes along the circumferential direction of the body, and the stirring mechanism is provided through the second annular structure.

[0028] In some embodiments, the first liquid outlet pipeline has an inner ring area and an outer ring area, and the number of the first liquid outlet holes corresponding to the inner ring area of ​​the first liquid outlet pipeline is greater than the number of the first liquid outlet holes corresponding to the outer ring area;

[0029] And / or, the second liquid outlet pipeline has an inner ring area and an outer ring area, and the number of the second liquid outlet holes corresponding to the inner ring area of ​​the second liquid outlet pipeline is greater than the number of the second liquid outlet holes corresponding to the outer ring area.

[0030] In some embodiments, a liquid inlet component is further included, wherein the liquid inlet component includes:

[0031] a first liquid inlet pipeline, disposed in the crystal growth area and connected to the first liquid outlet pipeline;

[0032] A second liquid inlet pipeline is disposed in the crystal growth area and communicated with the second liquid outlet pipeline.

[0033] In some embodiments, the invention further comprises:

[0034] A baffle is provided in the crystal growth zone, and along the axial direction of the body, the baffle is located below the dissolution crystallization zone and is provided corresponding to the dissolution crystallization zone.

[0035] In some embodiments, the baffle is a tapered structure, and the large end of the baffle is disposed toward the dissolution and crystallization zone;

[0036] And / or, the projection of the dissolved crystallization zone on a reference plane is located inside the projection of the baffle on the reference plane, wherein the reference plane is perpendicular to the axial direction of the body.

[0037] In some embodiments, the volume of the body is greater than or equal to 2000 cubic meters;

[0038] The diameter of the central tube is greater than or equal to 4m;

[0039] The diameter of the guide tube is greater than or equal to 6m.

[0040] In some embodiments, an overflow port is provided at the top of the body along the axial direction of the body;

[0041] And / or, a discharge port is provided at the bottom of the body along the axial direction of the body.

[0042] According to the second aspect of the present invention, an embodiment of the present invention also provides a crystallization circulation device, including a fine crystal tank and a crystallization device as described above, wherein the fine crystal tank is connected to the liquid outlet component of the crystallization device, and the fine crystal tank is used to prepare the dissolving liquid and transport the dissolving liquid to the liquid outlet component; the main body of the crystallization device is connected to the fine crystal tank, so that part of the crystals in the main body overflow into the fine crystal tank.

[0043] An embodiment of the present invention has the following advantages or beneficial effects:

[0044] In the crystallization device provided by the embodiment of the present invention, the axial force generated by the stirring mechanism pushes the dissolving liquid and the slurry mother liquor to the top of the main body, and the dissolving liquid and the slurry mother liquor quickly flow from the dissolution and crystallization area with unstable process to the crystal production area with relatively stable flow field.

[0045] The sedimentation section features an arc-shaped structure, which reduces the risk of salt accumulation in dead corners compared to existing conical structures. The diversion section features a tapered structure, with the small opening facing the sedimentation section. The sidewalls of the diversion section act as a guide, funneling the water toward the sedimentation section, facilitating the sinking and collection of potassium chloride and sodium chloride particles. The overflow section features a cylindrical structure, reducing overflow resistance and maximizing smoothness.

[0046] The crystallization circulation equipment provided by the embodiment of the present invention is connected to the fine crystal tank by the overflow port of the main body. The overflow from the overflow port carries overfine crystals, which enter the fine crystal tank and dissolve into the liquid phase, thereby reducing the total amount of fine crystals. After the crystal nuclei are reduced, the crystallization efficiency in the crystallization device can be improved. After the fine crystals are dissolved in the fine crystal tank, they flow from the fine crystal tank to the crystallization device as a dissolving liquid to dissolve the ore. By forming two stable flow fields of internal circulation and external circulation, the number of fine crystals in the crystallization device is controlled, efficient dissolution and crystallization are achieved, and the dissolution and crystallization efficiency of the crystallization device is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] To better understand the present invention, reference may be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present invention. In addition, related elements or components may have different arrangements as known in the art. In addition, in the drawings, the same reference numerals represent the same or similar components in each figure. The above and other features and advantages of the present invention will become more apparent by describing in detail its exemplary embodiments with reference to the accompanying drawings.

[0048] in:

[0049] Figure 1 Shown is a schematic structural diagram of a crystallization device according to an embodiment of the present invention;

[0050] Figure 2The figure shows a schematic structural diagram of a liquid outlet assembly in a crystallization device according to an embodiment of the present invention;

[0051] Figure 3 Shown is a structural diagram of a crystallization circulation device according to an embodiment of the present invention.

[0052] The description of the accompanying drawings is as follows:

[0053] 100. Crystallization device; 200. Fine crystal tank;

[0054] 1. Main body; 2. Center tube; 3. Guide tube; 4. Stirring mechanism; 5. Liquid outlet assembly; 6. First liquid inlet pipeline; 7. Second liquid inlet pipeline; 8. Baffle;

[0055] 10. Crystal growth zone; 20. Dissolution crystallization zone;

[0056] 11. Deposition part; 12. Diversion part; 13. Overflow part; 14. Overflow port; 15. Discharge port;

[0057] 21. first open end;

[0058] 31. second open end;

[0059] 51. First liquid outlet pipeline; 511. First liquid outlet hole; 52. Second liquid outlet pipeline; 521. Second liquid outlet hole. DETAILED DESCRIPTION

[0060] The following will be combined with the accompanying drawings in the exemplary embodiments of the present invention to clearly and completely describe the technical solutions in the exemplary embodiments of the present invention. The exemplary embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of the present invention.

[0061] In the description of the present invention, unless otherwise expressly provided or limited, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance; the term "plurality" refers to two or more; and the term "and / or" includes any and all combinations of one or more of the associated listed items. In particular, reference to "the" or "an" object is also intended to mean one of a possible plurality of such objects.

[0062] Unless otherwise specified or explained, the terms "connect," "fixed," etc. should be understood broadly. For example, "connected" may refer to a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; and "connected" may refer to a direct connection or an indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0063] Furthermore, in the description of the present invention, it should be understood that the directional words such as "upper", "lower", "inside", and "outside" described in the exemplary embodiments of the present invention are described based on the angles shown in the accompanying drawings and should not be understood as limiting the exemplary embodiments of the present invention. It should also be understood that, in the context, when it is mentioned that an element or feature is connected to another element (one or more) "upper", "lower", or "inside", "outside", it can not only be directly connected to the other (one or more) elements "upper", "lower", or "inside", "outside", but can also be indirectly connected to the other (one or more) elements "upper", "lower", "inside", "outside" through an intermediate element.

[0064] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. Like reference numerals in the figures represent like or similar structures, and thus their detailed description will be omitted.

[0065] This embodiment provides a crystallization device 100, such as Figure 1 As shown, the crystallization device 100 includes a main body 1, a stirring mechanism 4 and a liquid outlet component 5. The main body 1 is provided with a dissolution crystallization zone 20 and a crystal growth zone 10 that are interconnected; the stirring mechanism 4 is arranged in the dissolution crystallization zone 20 and can rotate relative to the main body 1, and the liquid outlet component 5 is arranged in the dissolution crystallization zone 20 for outputting the dissolved liquid and the slurry mother liquor.

[0066] The main body 1 is essentially a container, and the outer shape of the main body 1 can be cylindrical, conical, frustum-shaped, elliptical or special-shaped. The interior of the main body 1 has a holding cavity for holding slurries such as the dissolving liquid and the slurry mother liquor and performing the dissolution and crystallization process. The volume of the holding cavity is relatively large, and the volume of the holding cavity can exceed 2000 cubic meters, so that the slurries such as the dissolving liquid and the slurry mother liquor can stay for more than 3 hours. By increasing the volume of the main body 1, the space of the crystal growth zone 10 can also be increased, which can keep the crystal growth zone 10 relatively still to a certain extent and avoid being disturbed by the flow field.

[0067] The stirring mechanism 4 is installed in the body 1 and is usually of a paddle or spiral type. The stirring mechanism 4 provides power for the material. Specifically, the stirring mechanism 4 can generate sufficient radial force and axial force to facilitate the uniform distribution and circulation of the slurry, improve the mixing uniformity of the dissolving liquid and the slurry mother liquor in the slurry, form an internal flow field, and promote dissolution.

[0068] The dissolving liquid includes carnallite, which is composed of KCl·MgCl2·6H2O. Because it contains six waters of crystallization, it has a high solubility. Compared to salts without water of crystallization, carnallite dissolves faster. As the carnallite continues to dissolve, the MgCl2 and KCl content in the solution increases, and the solution gradually shifts from being unsaturated to saturated or even supersaturated. Since KCl has a lower solubility than MgCl2, KCl will precipitate and crystallize from the liquid phase, resulting in relatively fine KCl crystal particles. Because the dissolution and crystallization zone 20 is affected by the stirring mechanism 4, the dissolution and crystallization zone 20 is an area of ​​unstable flow field. The crystal growth zone 10 is not agitated by the stirring mechanism 4 and is a relatively stable area of ​​flow field, which is conducive to the growth of KCl crystals.

[0069] 49 Specifically, crystal growth zone 10 is a KCl crystal growth zone, where the flow field is relatively stable. Carnallite dissolves and crystallizes within dissolution and crystallization zone 20, generating fine KCl crystals. These are then pushed into crystal growth zone 10 by the flow field stirred by stirring mechanism 4. There, they absorb liquid KCl from the solution and grow. Excess fine crystals are transported from the overflow of crystallization device 100 to equipment such as fine crystal tank 200 for dissolution, ensuring standard KCl particle size.

[0070] If the dissolving liquid and the slurry mother liquor are directly transported to the top of the dissolving and crystallizing zone 20 through a pipeline and flow from top to bottom into the dissolving and crystallizing zone 20, the effectiveness of the axial force of the stirring mechanism 4 will be greatly weakened, the sinking of the KCl crystal particles will be accelerated, and the dissolving efficiency will be affected.

[0071] 51 To solve this problem, Figure 1 As shown, in the crystallization device 100 provided in the present application, the liquid outlet component 5 is arranged corresponding to the stirring mechanism 4 and is located above the stirring mechanism 4 along the axial direction of the main body 1. The stirring paddle of the stirring mechanism 4 is rotatably arranged in the dissolution and crystallization zone. Along the axial direction of the main body 1, the liquid outlet component 5 is configured to output the dissolving liquid and the slurry mother liquor respectively in the direction away from the stirring paddle of the stirring mechanism 4, so that the output direction of the dissolving liquid and the slurry mother liquor is the same as the direction in which the dissolving liquid and the slurry mother liquor are guided by the stirring paddle, so that the dissolving liquid and the slurry mother liquor dissolve and crystallize the ore in the dissolution and crystallization zone 20, and the ore after dissolution and crystallization is transported to the crystal growth zone 10 for growing crystals in the crystal growth zone 10. The direction of the stirring paddle away from the stirring mechanism 4 is the direction in which the stirring mechanism 4 guides the water flow upward.

[0072] In the crystallization device 100 provided in this embodiment, the axial force generated by the stirring mechanism 4 pushes the dissolving liquid and the slurry mother liquor to the top of the main body 1, and the dissolving liquid and the slurry mother liquor quickly flow from the dissolving and crystallizing zone 20 where the process is unstable to the crystal growth zone 10 where the flow field is relatively stable. The liquid outlet component 5 can output the dissolving liquid and the slurry mother liquor respectively along the axial direction of the main body 1 and in the direction away from the stirring mechanism 4, forming a fountain effect and accelerating the mixing speed. At the same time, the discharge direction of the liquid outlet component 5 is consistent with the flow field direction of the dissolving and crystallizing zone 20, both of which flow upward, which is equivalent to increasing the thrust in the same direction as the axial force of the stirring mechanism 4, which helps to improve the stability of the flow field and prolong the sedimentation time of the dissolving liquid and the slurry mother liquor in the dissolving and crystallizing zone 20.

[0073] In addition, the ratio of the two dissolving liquids, the dissolving liquid and the slurry mother liquor, can be adjusted according to system changes. In particular, the adjustment of the dissolving liquid can be quickly adjusted when fluctuations occur to achieve the purpose of controlled dissolution and crystallization, ensuring efficient dissolution while achieving the growth of potassium chloride particles.

[0074] In one embodiment, Figure 1 As shown, a discharge port 15 is provided at the bottom of the body 1 along the axial direction of the body 1 .

[0075] In the crystal growth area 10, small crystals continue to attach and grow and become heavy, and will be deposited at the bottom of the main body 1. Since the discharge port 15 is set at the bottom of the main body 1, the grown crystals can be discharged directly from the discharge port 15 under the action of their own gravity, saving discharge costs.

[0076] Among them, the diameter of the discharge port 15 is about DN500, and the distance between the discharge port 15 and the ground is about 3.2m. Of course, a discharge pump can also be directly connected to the discharge port 15, and the crystals can be extracted through the discharge port 15 by the discharge pump to increase the discharge speed. It is understood that the present application can adjust the discharge amount by adopting gravity and / or negative pressure conveying two lines according to production needs, which can effectively adjust the discharge flow rate, achieve stable and controllable flow rate, and avoid discharge blockage and the like when feed fluctuations occur.

[0077] In one embodiment, an overflow port 14 is provided at the top of the body 1 along the axial direction of the body 1 .

[0078] Since the small crystals in the solution in the crystal growth area 10 are relatively light in weight, they will float on the top of the main body 1 along its axial direction. Since the overflow port 14 is arranged above the main body 1, the small small crystals can overflow into the fine crystal tank through the overflow port 14, which is convenient for subsequent recycling.

[0079] In one embodiment, Figure 1As shown, the body 1 includes a settling portion 11, which is the bottom portion of the body 1 along the axial direction of the body 1. The settling portion 11 has an arc-shaped structure, which can reduce the risk of salt accumulation in dead corners compared to existing conical structures. The center angle of the settling portion 11 is approximately 60 degrees, and the height of the settling portion 11 is approximately 0.5m to 1.5m, for example, the height of the settling portion 11 is 1m.

[0080] The main body 1 also includes a guide portion 12, which is the middle part of the main body 1 along the axial direction of the main body 1. The guide portion 12 is a tapered structure, and the small mouth end of the guide portion 12 is arranged toward the sedimentation portion 11. The side wall of the guide portion 12 plays a guiding role and plays a role of converging to the sedimentation portion 11, which is conducive to the sinking and collection of potassium chloride particles and sodium chloride particles.

[0081] The body 1 further includes an overflow portion 13 , which is the top portion of the body 1 along the axial direction of the body 1 . The guide portion 12 is disposed between the deposition portion 11 and the overflow portion 13 .

[0082] Since the flow rate decreases as the overflow approaches the top of the main body 1, an overflow port 14 is provided in the overflow portion 13. The overflow portion 13 has a cylindrical structure to reduce overflow resistance and increase overflow smoothness. The height of the overflow portion 13 is approximately 1m to 2.5m, and the diameter of the overflow portion 13 is approximately 18m to 19m. For example, the diameter of the overflow portion 13 is 18.4m.

[0083] It can be understood that there is no stirring of the stirring mechanism 4 in the crystal growth zone 10. Only the fluid overflowing from the overflow port 14 generates upward friction and the fluid from the bottom discharge port 15 generates downward friction. The flow field in the crystal growth zone 10 is relatively stable, which is conducive to crystal growth.

[0084] In addition, the upward friction generated by the fluid not only controls the suspended growth of fine crystals in the crystal growth zone 10, but also removes excessively small crystals, allowing them to flow through the overflow port 14 into the fine crystal tank 200 for dissolution, reducing the number of crystal nuclei and increasing the efficiency of larger crystals in absorbing KCl from the solution in the crystal growth zone 10. As the crystals grow, their particle size increases until the gravity of the crystals exceeds the difference in friction between the upper and lower fluids (viscosity). The crystals then gradually settle to the bottom of the main body 1 and are discharged through the discharge port 15.

[0085] In one embodiment, the stirring mechanism 4 includes a driving rod, the output end of which is connected to a stirring paddle, and the driving rod is mounted on the main body 1 through a bearing. The driving rod drives the stirring paddle to rotate relative to the main body 1, so that the dissolved liquid and the slurry mother liquor are evenly distributed and fully stirred. The stirring paddle can generate sufficient radial force and axial force to ensure that the solute and solvent in the slurry are mixed, thereby promoting the crystallization process.

[0086] Due to the large volume of the main body 1, a higher stirring torque is required. If a speed reducer is used to increase the torque, a high failure rate is likely to occur. For example, the drive rod is connected to the stirring motor, which can use a 500KW high-power permanent magnet motor, eliminating the speed reducer that is prone to failure. After long-term industrial application, the stability and reliability are improved.

[0087] The diameter of the stirring paddle is 3.5m to 4.5m, and the distance between the stirring paddle and the liquid outlet assembly 5 located above it is greater than or equal to 2m, that is, along the axial direction of the body 1, the distance between the stirring paddle and the lowest end surface of the liquid outlet assembly 5 is greater than or equal to 2m, so as to avoid interference between the stirring paddle and the liquid outlet assembly 5 when the stirring paddle is rotating. The stirring paddle can be equipped with multiple blades to stir and mix in a spiral propulsion manner, or can also use blades of different shapes, such as paddle-shaped, turbine-shaped, or folding-leaf-shaped.

[0088] In one embodiment, the crystallization device 100 further includes a central cylinder 2 , which is disposed in the main body 1 , the dissolution and crystallization zone 20 is disposed in the central cylinder 2 , and the stirring mechanism is located in the central cylinder 2 .

[0089] Specifically, the dissolving liquid, slurry mother liquor, and main materials enter the dissolving and crystallizing zone 20 of the central barrel 2. The dissolving and crystallizing zone 20 is a mixing area and also a dissolving and crystallizing area. The central barrel 2 can help control the upward flow of the dissolving liquid, slurry mother liquor, and main materials, playing a guiding and guiding role.

[0090] The distance between the top of the central tube 2 and the top of the body 1 is approximately 1m to 1.5m, for example, 1.4m. The diameter of the central tube 2 is 0.25 to 0.30 times the diameter of the overflow portion 13 of the body 1, and the length of the central tube 2 is 1 to 2 times the diameter of the overflow portion 13 of the body 1. The diameter of the central tube 2 is greater than or equal to 4m, specifically, 4m to 6m, for example, approximately 5m.

[0091] It should be noted that, different from the carnallitite reaction principle, sylvite does not belong to dissolution crystallization in central barrel 2, belongs to dissolution dissociation, and when sylvite particle enters crystallization device central barrel 2 and mixes with dissolution solution, dissolution reaction can be produced, and particle size diminishes.When particle is less than 1.45mm, monomer dissociation occurs in KCl and NaCl in sylvite.Therefore, there is no crystallization process in central barrel 2 in sylvite, realizes that isolated KCl and NaCl granular crystal are all larger by dissolving, owing to be monosalt and there is no crystal water in sylvite composition, compared with carnallitite, dissolution time is longer, and difficulty is larger, therefore the carnallitite ore containing sylvite, the crushing and grinding process before crystallization makes its granularity reach below 1.5mm as far as possible, reduces dissolving difficulty.

[0092] If the central tube 2 has a conical structure, the axial force of the stirring paddle will easily cause a dead angle, resulting in some crystal particles being unable to enter the crystal growth zone 10. Therefore, the central tube 2 provided in this embodiment has a cylindrical structure. Since the inner wall of the cylindrical structure is a straight wall structure, the axial force of the stirring paddle will not cause the crystal to sink or flow out of the dead angle, and the slurry such as the dissolving liquid, slurry mother liquor and main materials can flow upward, which is conducive to crystal growth.

[0093] It is understandable that the central tube 2 and the guide tube 3 include but are not limited to cylindrical structures, and may also be trumpet-shaped, conical or other special-shaped structures.

[0094] In one embodiment, Figure 1 As shown, along the axial direction of the body 1 , at least one end of the central tube 2 is provided with a first open end 21 , and the dissolution crystallization zone 20 is connected with the crystal growth zone 10 through the first open end 21 .

[0095] It should be noted that the mother liquors output by the first liquid outlet pipeline 51 and the second liquid outlet pipeline 52 may be the same or different. Specifically, one of the first liquid outlet pipeline 51 and the second liquid outlet pipeline 52 transports the slurry adjustment mother liquor, and the other transports the decomposition mother liquor. This embodiment does not limit the type of mother liquor and can be adjusted according to actual production conditions.

[0096] For example, the upper end of the central tube 2 along the axial direction of the main body 1 is provided with a first open end 21. After mixing, dissolving, and crystallizing, the dissolving liquid and the slurry mother liquor in the dissolving and crystallizing zone 20 of the central tube 2 can flow to the crystal growth zone 10 through the first open end 21. The first open end 21 provides a delivery channel for the dissolving liquid and the slurry mother liquor to the crystal growth zone 10.

[0097] For example, a first open end 21 is provided at the lower end of the central tube 2 along the axial direction of the main body 1, so that during the stirring process, the liquid outside the central tube 2 can be guided into the central tube 2 and form an upward flow field. The dissolved liquid accelerates the mixing efficiency and liquid volume, prolongs the residence time of the material in the dissolution and crystallization zone, and improves the dissolution and crystallization efficiency and the smoothness of transportation.

[0098] In one embodiment, Figure 1 As shown, the crystallization device 100 also includes a guide tube 3, which is arranged in the main body 1 and sleeved on the outside of the central tube 2, the crystal growth zone 10 is arranged between the central tube 2, the guide tube 3 and the main body 1, and the dissolution crystallization zone 20 is connected to the crystal growth zone 10 through the guide tube 3.

[0099] The guide tube 3 is actually a conveying channel between the dissolution and crystallization zone 20 of the central tube 2 and the crystal growth zone 10. The guide tube 3 plays the role of guidance, transition and buffering, so that the ore after dissolution and crystallization in the central tube 2 can be quickly transported to the crystal growth zone 10 through the guide tube 3.

[0100] If the guide tube 3 has a conical structure, dead corners are likely to appear, preventing some crystal particles from entering the crystal growth zone 10. Therefore, the guide tube 3 provided in this embodiment has a cylindrical structure. Since the inner wall of the cylindrical structure is a straight wall structure, no dead corners will appear, which is conducive to the transportation of the dissolving liquid, slurry mother liquor and main materials, and improves the crystal growth efficiency.

[0101] Among them, the top of the guide tube 3 is flush with the top of the main body 1, the guide tube 3 is coaxially arranged with the central tube 2 and is located on the outside of the central tube 2, the diameter of the guide tube 3 is 0.35 to 0.4 times the diameter of the overflow portion 13, the length of the guide tube 3 is 0.5 to 1 times the diameter of the overflow portion 13, and the diameter of the guide tube 3 is greater than or equal to 6m. Specifically, the diameter of the guide tube 3 is 6m to 8m. For example, the diameter of the guide tube 3 is approximately 7m.

[0102] In one embodiment, along the axial direction of the body 1 , at least one end of the guide tube 3 is provided with a second open end 31 , so that the guide tube 3 is connected to the dissolution crystallization zone 20 and / or the crystal growth zone 10 through the second open end 31 .

[0103] Exemplarily, the upper end of the guide tube 3 along the axial direction of the main body 1 is provided with a second open end 31, that is, the upper ends of the central tube 2 and the guide tube 3 are both open structures, so that the dissolved liquid and the slurry mother liquor in the dissolution and crystallization zone 20 flow to the guide tube 3 through the first open end 21, the second open end 31 or the position of the guide tube 3 near the second open end 31 or the middle position of the guide tube 3, and the inner wall of the guide tube 3 is used to drain and guide to limit the flow path of the dissolved liquid and the slurry mother liquor.

[0104] Exemplarily, a second open end 31 is provided at the lower end of the guide tube 3 along the axial direction of the main body 1, so that the dissolved liquid and slurry mother liquor in the guide tube 3 flow to the crystal growth zone 10 through the second open end 31, thereby realizing a guided flow field, and at the same time isolating the stirring dynamic area and the crystal growth zone 10 requiring stable conditions.

[0105] In this way, under the action of the guide tube 3, the flow paths of the dissolving liquid and the slurry mother liquor are tortuous, which increases the flow paths of the dissolving liquid and the slurry mother liquor, prolongs the residence time, and thus improves the crystallization effect.

[0106] In one embodiment, Figure 1 As shown, along the axial direction of the body 1 , the height dimension of the guide tube 3 is smaller than the height dimension of the central tube 2 .

[0107] Since the height of the guide tube 3 is relatively small, the conveying channel is shortened and direct, reducing the occurrence of salt accumulation and congestion in the conveying channel. It is understandable that no complex structures such as guide plates are added to the guide tube 3 to reduce the risk of blockage.

[0108] In one embodiment, Figure 1 As shown, along the axial direction of the body 1 , the second open end 31 of the guide tube 3 is higher than the first open end 21 of the center tube 2 corresponding thereto.

[0109] Exemplarily, along the axial direction of the body 1 and in a direction away from the stirring mechanism 4 , the second open end 31 of the guide tube 3 is higher than the first open end 21 of the central tube 2 .

[0110] That is, along the axial direction of the main body 1, the height position of the second open end 31 located at the upper end of the guide tube 3 is relatively high. When the dissolved liquid and the slurry mother liquor overflow from the first open end 21 at the upper end of the central tube 2 to the guide tube, the second open end 31 of the guide tube 3 acts as a barrier to prevent direct overflow to the crystal growth area 10.

[0111] Exemplarily, along the axial direction of the body 1 and in a direction close to the stirring mechanism 4 , the second open end 31 of the guide tube 3 is higher than the first open end 21 of the central tube 2 .

[0112] That is, along the axial direction of the main body 1, the height of the second open end 31 at the lower end of the guide tube 3 is relatively high, shortening the overall length of the guide tube 3. It is understood that if the height of the second open end 31 is too low, the material entering the crystal growth zone 10 from the guide tube 3 will be too close to the bottom of the main body 1, which is not conducive to the uniform and reasonable distribution of coarse and fine crystal materials.

[0113] In one embodiment, Figure 1 As shown, the liquid outlet component 5 includes a first liquid outlet pipeline 51 and a second liquid outlet pipeline 52. The first liquid outlet pipeline 51 is used to output the dissolved liquid in a direction away from the stirring mechanism 4; the second liquid outlet pipeline 52 is arranged in parallel with the first liquid outlet pipeline 51 and is used to output the slurry mother liquor in a direction away from the stirring mechanism 4.

[0114] The first and second liquid outlet lines 51, 52 are used to transport the dissolving liquid and the slurry preparation mother liquor, respectively. The transport processes are independent and do not affect each other. The coordinated action of the first and second liquid outlet lines 51, 52 creates a dual fountain effect within the dissolution and crystallization zone 20, further increasing the thrust in the same direction as the axial force of the stirring mechanism 4, extending the settling time and further improving the dissolution and crystallization effect. By combining fluid mechanics and flow field design, this design has proven to be effective in industrial applications.

[0115] Among them, such as Figure 1-Figure 2As shown, the first liquid outlet pipe 51 is a first annular structure. The first liquid outlet pipe is provided with a plurality of first liquid outlet holes 511 along the circumferential direction of the body 1, so that the solution ejected from the first liquid outlet holes 511 is more uniform. The stirring mechanism 4 is provided through the first annular structure. The center hole of the first annular structure can avoid the stirring mechanism 4 and will not affect the stirring effect of the stirring mechanism 4.

[0116] Among them, such as Figure 1-Figure 2 As shown, the second liquid outlet pipe 52 is a second annular structure. The second liquid outlet pipe is provided with a plurality of second liquid outlet holes 521 along the circumferential direction of the body 1, so that the slurry mother liquid ejected from the second liquid outlet holes 521 is more uniform. The stirring mechanism 4 is provided through the second annular structure. The center hole of the second annular structure can avoid the stirring mechanism 4 and will not affect the stirring effect of the stirring mechanism 4.

[0117] By providing an annular first liquid outlet conduit 51 and a second liquid outlet conduit 52 within the dissolution and crystallization zone 20, the dissolving liquid and the slurry mixing mother liquor can be promptly mixed and reacted with the material entering from the main body 1. Utilizing the first liquid outlet conduit 51 and the second liquid outlet conduit 52, a stable flow field is formed for the dissolving liquid and the slurry mixing mother liquor after entering the dissolution and crystallization zone 20, and the contact area between the dissolving liquid, the slurry mixing mother liquor and the material is increased, thereby accelerating uniform distribution.

[0118] For example, the number of the first and second liquid outlet holes 511 and 521 is about 8 to 48, and the diameter of the first and second liquid outlet holes 511 and 521 is about 30 mm to 100 mm. For example, the diameter of the first and second liquid outlet holes 511 and 521 is 80 mm.

[0119] In one embodiment, Figure 2 As shown, the first liquid outlet pipeline 51 has an inner ring area and an outer ring area, and the number of first liquid outlet holes 511 corresponding to the inner ring area of ​​the first liquid outlet pipeline 51 is greater than the number of first liquid outlet holes 511 corresponding to the outer ring area; and / or, the second liquid outlet pipeline 52 has an inner ring area and an outer ring area, and the number of second liquid outlet holes 521 corresponding to the inner ring area of ​​the second liquid outlet pipeline 52 is greater than the number of second liquid outlet holes 521 corresponding to the outer ring area.

[0120] Since the material concentration in the inner ring is high, the number of discharge ports in the inner ring area is relatively large; since the material concentration in the outer ring is low, the number of discharge ports in the outer ring area is small, so that the solid and liquid in the dissolution and crystallization area 20 are mixed more quickly and evenly.

[0121] Exemplarily, the first liquid outlet pipeline 51 is coaxially arranged with the central tube 2, and the distance between the first liquid outlet pipeline 51 and the top of the central tube 2 is approximately 3.3m, the outer ring diameter of the first liquid outlet pipeline 51 is approximately 2.4m, and the inner ring diameter of the first liquid outlet pipeline 51 is approximately 2.2m; the diameter of the second liquid outlet pipeline 52 is DN500, and the angle between the inclined section of the second liquid outlet pipeline 52 and the horizontal is approximately 137°; the second liquid outlet pipeline 52 is coaxially arranged with the central tube 2, and the distance between the second liquid outlet pipeline 52 and the first liquid outlet pipeline 51 is 0.9m, the outer ring diameter of the second liquid outlet pipeline 52 is 2.4m, and the inner ring diameter of the second liquid outlet pipeline 52 is 2.2m.

[0122] In one embodiment, Figure 1 As shown, the crystallization apparatus 100 further includes a first liquid inlet line 6, which is disposed within the crystal growth zone 10 and passes through the central barrel 2, which serves to securely mount the first liquid inlet line 6. The first liquid inlet line 6 is in communication with a first liquid outlet line 51, such that the solution introduced through the first liquid inlet line 6 is transported to the first liquid outlet line 51.

[0123] The diameter of the first liquid inlet pipeline 6 is approximately DN500, and the angle between the inclined section of the first liquid inlet pipeline 6 and the horizontal is approximately 137°.

[0124] In one embodiment, Figure 1 As shown, the crystallization apparatus 100 further includes a second liquid inlet pipeline 7, which is disposed within the crystal growth zone 10 and passes through the central barrel 2, which serves to securely mount the second liquid inlet pipeline 7. The second liquid inlet pipeline 7 is in communication with a second liquid outlet pipeline 52, such that the slurry mother liquor introduced from the second liquid inlet pipeline 7 is transported to the second liquid outlet pipeline 52.

[0125] 105 In one embodiment, as Figure 1 As shown, the crystallization device 100 further includes a baffle 8 , which is disposed in the crystal growth zone 10 . Along the axial direction of the body 1 , the baffle 8 is located below the dissolution crystallization zone 20 and is disposed corresponding to the dissolution crystallization zone 20 .

[0126] Baffle 8 optimizes the flow paths of the dissolving liquid and the slurry mother liquor. When the feed particles are too large, the direct fall of the material is reduced, preventing the formation of internal short circuits in the large-particle material. This increases the contact time between the material and the internal structure of the crystallization device, prolonging the material residence time, thereby improving the efficiency and quality of dissolution and crystallization. At the same time, it also avoids the generation of eddy currents and excessive impact forces, preventing the radial force of the stirring paddle from being transmitted to the crystal growth zone 10, allowing the crystal growth zone 10 to maintain steady-state operation, which is conducive to crystal growth.

[0127] A support frame is further provided in the main body 1 , and the support frame is used to carry the baffle 8 and provide an installation and fixing position for the baffle 8 .

[0128] In one embodiment, the baffle 8 is a tapered structure, and the large end of the baffle 8 is disposed toward the dissolution and crystallization zone 20 .

[0129] That is, the baffle 8 is similar to a bowl-shaped structure with a horizontal bottom and relatively high edges. It is used to isolate the dissolution and crystallization zone 20 over a large area, avoiding the stirring effect on the crystal growth zone 10, and facilitating the growth of crystals in the crystal growth zone 10. At the same time, it helps to optimize the slurry flow path, prevent material accumulation and excessive impact force, and extend the material residence time, thereby improving the crystallization effect.

[0130] In one embodiment, a projection of the dissolved crystallized region 20 on a reference plane is located inside a projection of the baffle 8 on the reference plane, wherein the reference plane is perpendicular to the axial direction of the body 1 .

[0131] In this way, the area of ​​the baffle 8 can completely cover the dissolution and crystallization zone 20, increase the isolation effect between the dissolution and crystallization zone 20 and the crystal growth zone 10, further extend the material residence time and dissolution efficiency, and reduce the risk of eddy currents and impact forces generated by the stirring mechanism 4 affecting the crystal growth zone 10.

[0132] The working process of the crystallization device 100 provided in this application is as follows:

[0133] The dissolving liquid introduced from the first liquid inlet pipe 6 is transported to the first liquid outlet pipe 51, and the slurry mother liquor introduced from the second liquid inlet pipe 7 is transported to the second liquid outlet pipe 52. Under the coordinated action of the first liquid outlet pipe 51 and the second liquid outlet pipe 52, a double fountain effect is formed in the dissolution and crystallization zone 20, so that the output direction of the dissolving liquid and the slurry mother liquor is the same as the direction in which the dissolving liquid and the slurry mother liquor are guided by the stirring paddle, so that the dissolving liquid and the slurry mother liquor are fully dissolved in the dissolution and crystallization zone 20 of the central tube 2. The dissolved and crystallized ore then flows through the first open end 21 of the central tube 2 into the guide tube 3 and enters the crystal growth zone 10 from the second open end 31 at the bottom of the guide tube 3 for crystal growth. A portion of the heavier crystals is guided by the guide portion 12 and sinks to the sedimentation portion 11 of the main body 1 for sedimentation, while another portion of the lighter crystals rises through the guide portion 12 to the overflow portion 13 to overflow into the fine crystal tank.

[0134] The crystallization device 100 provided herein increases the volume of the main body 1, extending the crystal growth time to over three hours and improving the crystallization effect. By improving the structure of the main body 1, the flow guide tube 3, and the central tube 2, the internal flow field is improved, solving the problems of dead corners and material accumulation within the main body 1. By optimizing the discharge port 15, the problem of easy clogging during fluctuations and system instability is resolved.

[0135] This embodiment also provides a crystallization circulation device, such as Figure 3 As shown, the crystallization circulation equipment includes a fine crystal tank 200 and the above-mentioned crystallization device 100. The fine crystal tank 200 is connected to the liquid outlet component 5 of the crystallization device 100. The fine crystal tank 200 is used to prepare the dissolved liquid and transport the dissolved liquid to the liquid outlet component 5; the main body 1 of the crystallization device 100 is connected to the fine crystal tank 200, so that part of the crystals in the main body 1 overflow into the fine crystal tank 200.

[0136] Since the overflow port 14 of the main body 1 is connected to the fine crystal tank 200, the solution overflowing from the overflow port 14 will carry overfine crystals, and the crystals entering the fine crystal tank 200 will dissolve into the liquid phase, thereby reducing the total amount of fine crystals. After the crystal nuclei are reduced, the crystallization efficiency in the crystallization device 100 can be improved.

[0137] The dissolved liquid specifically refers to the mother liquor flowing from the fine crystal tank 200 to the crystallization device 100. The dissolved liquid added to the fine crystal tank 200 is mixed with the liquid overflowing from the overflow port 14. It can be understood that the dissolved liquid flowing out of the fine crystal tank 200 mainly comes from three sources: the overflow of the crystallization device 100, the refined potassium mother liquor, and the fresh water added according to usage requirements. That is, the liquid output of the fine crystal tank 200 is the sum of the total overflow of the crystallization device 100 through the overflow port 14, the refined potassium mother liquor flow rate, and the adjustable fresh water amount.

[0138] It is understandable that, according to design and requirements, the amount of fine crystals that need to overflow into the fine crystal tank 200 and the size of the crystal particles that need to overflow can be controlled by adjusting the overflow flow rate of the overflow port 14, thereby controlling the crystallization process of the crystallization device 100.

[0139] After the fine crystals are dissolved in the fine crystal tank 200 , the dissolving liquid flows from the fine crystal tank 200 to the central cylinder 2 of the crystallization device 100 to dissolve the ore.

[0140] In summary, the present application can adapt to the production in the fields of low sodium, high sodium carnallite and carnallite potassium mixed potassium salt mine potassium chloride, is applicable to all kinds of carnallite potassium salt mines, and raw material adaptability is strong.Raw material fully dissolves and crystallizes in crystallizer 100, and internally forms a stable circulating flow field structure.The large volume design of body 1 effectively improves the stability of the circulation of fine-grained material in crystallizer 100, and prolongs crystallization time.By forming an inner loop between central tube 2, guide tube 3, realize crystal granularity growth, fine-grained particles are discharged to fine crystal tank 200 by overflow port 14 and carry out crystallization, in fine crystal tank 200, dissolved liquid returns to the body 1 of crystallizer 100 by dissolved liquid pipeline to form an outer loop, thereby reducing the fine crystal total amount in crystallizer 100, effectively improving circulating flow field stability and fine-grained crystallization time, promoting particle size, thereby improving recovery efficiency and realizing the granularity index of final product.

[0141] By forming two stable flow fields of inner circulation and outer circulation, the amount of fine crystals in the crystallization device 100 is controlled, efficient dissolution and crystallization of the ore is achieved, the dissolution and crystallization efficiency of the crystallization device 100 is improved, and the composition index of the dissolving liquid is effectively regulated.

[0142] It should be noted that the embodiments of the present invention are shown in the drawings and described in this specification is only an example of the principles of the present invention. It should be clear to those skilled in the art that the principles of the present invention are not limited to any details or any components of the devices shown in the drawings or described in the specification.

[0143] It should be understood that the present invention is not limited in its application to the detailed structure and arrangement of the components proposed in this specification. The present invention is capable of other embodiments and can be implemented and executed in a variety of ways. The aforementioned variations and modifications fall within the scope of the present invention. It should be understood that the present invention disclosed and defined in this specification extends to all alternative combinations of two or more individual features mentioned or apparent in the text and / or the drawings. All of these different combinations constitute multiple alternative aspects of the present invention. The embodiments described in this specification illustrate the best known ways to implement the present invention and will enable those skilled in the art to utilize the present invention.

[0144] Other embodiments of the present invention will readily occur to those skilled in the art after considering this specification and practicing the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The description and example embodiments are to be considered as exemplary only, with the true scope and spirit of the invention being indicated by the appended claims.

[0145] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of protection of the present invention is limited only by the appended claims.

Claims

1. A crystallization device, characterized in that: include: The body includes a deposition portion, a guide portion, and an overflow portion. The guide portion is disposed between the deposition portion and the overflow portion. The deposition portion is an arc-shaped structure. The guide portion is a tapered structure. The small end of the guide portion is disposed toward the deposition portion. The overflow portion is a cylindrical structure. A central tube is provided in the main body, wherein a dissolution and crystallization area is provided in the central tube; a stirring mechanism, disposed in the central cylinder and capable of rotating relative to the body; a liquid outlet component, the liquid outlet component being arranged corresponding to the stirring mechanism; a guide tube disposed in the body and sleeved on the outside of the central tube; a crystal growth zone is provided between the central tube, the guide tube and the body; the dissolution and crystallization zone is connected to the crystal growth zone through the guide tube; Among them, along the axial direction of the main body, the liquid outlet component is configured to output the dissolving liquid and the slurry mother liquor into the dissolving and crystallizing zone, and the stirring mechanism can rotate relative to the main body to mix the dissolving liquid and the slurry mother liquor in the dissolving and crystallizing zone, and transport the ore after dissolution and crystallization to the crystal growth zone for growing crystals in the crystal growth zone.

2. The crystallization device according to claim 1, characterized in that The central tube is a cylindrical structure.

3. The crystallization device according to claim 2, characterized in that Along the axial direction of the body, at least one end of the central tube is provided with a first open end, and the dissolution and crystallization zone is communicated with the crystal growth zone through the first open end.

4. The crystallization device according to claim 2, characterized in that The guide tube is a cylindrical structure.

5. The crystallization device according to claim 4, characterized in that Along the axial direction of the body, at least one end of the guide tube is provided with a second open end, so that the guide tube is connected with the dissolution and crystallization zone and / or the crystal growth zone through the second open end.

6. The crystallization device according to claim 5, characterized in that Along the axial direction of the body, the height of the guide tube is smaller than the height of the central tube.

7. The crystallization device according to claim 6, characterized in that The stirring mechanism includes a stirring paddle, and the second opening end of the guide tube is higher than the first opening end of the central tube along the axial direction of the body and away from the stirring paddle of the stirring mechanism; And / or, along the axial direction of the body and close to the stirring blade of the stirring mechanism, the second opening end of the guide tube is higher than the first opening end of the central tube.

8. The crystallization device according to any one of claims 1 to 7, characterized in that The stirring mechanism includes a stirring paddle, which is rotatably arranged in the dissolution and crystallization zone; The liquid outlet assembly is configured to output the dissolved liquid and the slurry mixing mother liquid respectively in a direction away from the stirring paddle, so that the output directions of the dissolved liquid and the slurry mixing mother liquid are the same as the directions in which the dissolved liquid and the slurry mixing mother liquid are guided by the stirring paddle; The liquid outlet component comprises: a first liquid outlet pipeline, for outputting the dissolved liquid in a direction away from the stirring mechanism; The second liquid outlet pipeline is arranged in parallel with the first liquid outlet pipeline and spaced apart from each other, and is used to output the slurry mixing mother liquid in a direction away from the stirring mechanism.

9. The crystallization device according to claim 8, characterized in that The first liquid outlet pipe is a first annular structure, the first liquid outlet pipe is provided with a plurality of first liquid outlet holes along the circumferential direction of the body, and the stirring mechanism is provided through the first annular structure; And / or, the second liquid outlet pipeline is a second annular structure, the second liquid outlet pipe is provided with a plurality of second liquid outlet holes along the circumferential direction of the body, and the stirring mechanism is provided through the second annular structure.

10. The crystallization device according to claim 9, characterized in that The first liquid outlet pipeline has an inner ring area and an outer ring area, and the number of the first liquid outlet holes corresponding to the inner ring area of ​​the first liquid outlet pipeline is greater than the number of the first liquid outlet holes corresponding to the outer ring area; And / or, the second liquid outlet pipeline has an inner ring area and an outer ring area, and the number of the second liquid outlet holes corresponding to the inner ring area of ​​the second liquid outlet pipeline is greater than the number of the second liquid outlet holes corresponding to the outer ring area.

11. The crystallization device according to claim 8, characterized in that Also included is a liquid inlet assembly, the liquid inlet assembly comprising: a first liquid inlet pipeline, disposed in the crystal growth area and connected to the first liquid outlet pipeline; A second liquid inlet pipeline is disposed in the crystal growth area and communicated with the second liquid outlet pipeline.

12. The crystallization device according to any one of claims 1 to 7, characterized in that Also includes: A baffle is provided in the crystal growth zone, and along the axial direction of the body, the baffle is located below the dissolution crystallization zone and is provided corresponding to the dissolution crystallization zone.

13. The crystallization device according to claim 12, characterized in that The baffle is a tapered structure, and the large end of the baffle is arranged toward the dissolution and crystallization zone; And / or, the projection of the dissolved crystallization zone on a reference plane is located inside the projection of the baffle on the reference plane, wherein the reference plane is perpendicular to the axial direction of the body.

14. The crystallization device according to any one of claims 1 to 7, characterized in that The volume of the body is greater than or equal to 2000 cubic meters; The diameter of the central tube is greater than or equal to 4m; The diameter of the guide tube is greater than or equal to 6m.

15. The crystallization device according to any one of claims 1 to 7, characterized in that An overflow port is provided on the top of the body along the axial direction of the body; And / or, a discharge port is provided at the bottom of the body along the axial direction of the body.

16. A crystallization circulation device, characterized in that: It comprises a fine crystal tank and a crystallization device as described in any one of claims 1 to 15, wherein the fine crystal tank is connected to the liquid outlet component of the crystallization device, the fine crystal tank is used to prepare the dissolving liquid and transport the dissolving liquid to the liquid outlet component; the main body of the crystallization device is connected to the fine crystal tank, so that part of the crystals in the main body overflow into the fine crystal tank.

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