System for preventing crystallization by using NaOH in wet process equipment

Abstract

The invention discloses a system for preventing crystallization by using NaOH for wet process equipment, which comprises a heating device, a stirring mechanism, a deformation pad and a circulating pipeline, and is characterized in that the heating device is used for uniformly heating a solution, and dynamic flowing of the circulating pipeline is combined to ensure uniform distribution of the temperature and concentration of the solution and avoid local supersaturation; the stirring mechanism enhances the uniform distribution of the solution and improves the mixing efficiency of the solution through circular motion and autorotation of stirring blades, a deformation pad changes the form through lifting motion, so that the fluidity of the solution is optimized, the crystallization phenomenon is avoided, impurities in the solution are further cleaned and collected through lifting deformation of the deformation pad, and the production efficiency is improved. According to the system, impurities in a solution can be cleaned through continuous stirring and the deformation pad, the risks of crystallization, precipitation and equipment blockage are reduced, the service life of equipment is prolonged, the maintenance cost is reduced, the working efficiency is improved, and meanwhile, the solution is kept clean and stable.

Description

Technical Field

[0001] The invention relates to the technical field of using NaOH to prevent crystallization in wet process equipment, and in particular to a system for using NaOH to prevent crystallization in wet process equipment. Background Art

[0002] The rise of photovoltaics in the energy market means that the requirements for output and quality are getting higher and higher. Production capacity and cost tasks have become the main ways for companies to increase revenue. Superior quality can better meet the needs of serving customers. At present, the wet process uses NaOH to replace KOH to reduce costs and improve efficiency. The principle of the photovoltaic cell rework process is to use the anisotropic characteristics of single-crystal silicon. Naoh reacts with silicon corrosion to remove the surface oxide layer and impurities. In this process, the oxide layer and impurities on the surface of the silicon wafer will react with the solution to generate water and corresponding salts, thereby removing the surface oxide layer and impurities.

[0003] In the photovoltaic cell rework process, the chemical used in the alkali tank is sodium hydroxide, which is easy to crystallize, causing pipe blockage, affecting the liquid change time, and reducing the efficiency of liquid change. If the cleaning is not standardized, it is easy to cause batch defects. The existing cleaning of alkali crystals requires disassembly of the heating barrel and circulation pipeline, and the soaking tank is difficult to clean. The cleaning takes a long time, the effect after cleaning is not good, and the maintenance cycle is short. The cleaning process will cause contamination of the tank body, thereby affecting the yield and production capacity of the photovoltaic cells. Therefore, it is difficult to heat the solution inside the tank body.

[0004] For this purpose, we propose a system for preventing crystallization using NaOH in wet process equipment. Summary of the invention

[0005] The object of the present invention is to provide a system for preventing crystallization of wet process equipment using NaOH, which has the advantage of heating the solution inside the tank and solves the problems in the background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a system for preventing crystallization of a wet process equipment using NaOH, comprising a tank body supported and placed by an external bracket, installation grooves are provided at symmetrical positions on both sides of the tank body, the inner walls of the installation grooves on both sides are penetrated and fixedly connected with heating rods for heating the solution inside the tank body, and the tank body is provided with a circulation mechanism for extracting the solution inside the tank body for circulation heating; The circulation mechanism includes a heating device for heating the solution fixedly connected to one side of the trough body, an end of the trough body near the bottom is penetrated and fixedly connected with a liquid inlet pipe, and the end of the liquid inlet pipe away from the trough body is penetrated to the inner wall of the heating device near the bottom, a circulation pump connected to the liquid inlet pipe is fixedly connected to the side of the trough body near the heating device, a circulation pipe is penetrated and fixedly connected to one side of the heating device near the end, and the end of the circulation pipe away from the heating device is penetrated to the inner wall of the bottom end of the trough body and fixedly connected.

[0007] Preferably, the heating rod is located at the bottom of the tank, and the heating rods have two cylindrical rods with a power of 9 kW and a diameter of 5 cm. Both heating rods are provided with quartz glass sleeves that are resistant to oxidation, high temperature and corrosion.

[0008] Preferably, a liquid level sensor for monitoring the liquid level is fixedly connected to the inner wall of the bottom of the tank.

[0009] Preferably, the trough body is provided with a stirring mechanism for uniformly stirring the internal solution, the stirring mechanism includes a transmission shaft that is penetrated through the bottom of the trough body and is rotatably connected to it and driven by a power mechanism, a sleeve rod is fixedly connected to the outer contour of the transmission shaft near the end, the inner wall of the sleeve rod away from the transmission shaft is penetrated and movably connected to a moving rod for telescopic movement, the end of the moving rod away from the sleeve rod is penetrated and rotatably connected to a rotating shaft, and the end of the rotating shaft is fixedly connected to a stirring fan blade for stirring the solution inside the trough body.

[0010] Preferably, the inner wall of the bottom of the trough body is fixedly connected with an elliptical gear ring that drives the rotating shaft to rotate on a fixed axis, and the outer contour of the rotating shaft near the bottom end is fixedly connected with a gear that meshes with the elliptical gear ring for transmission, and an elliptical groove that supports the rotating shaft is opened at the bottom of the trough body, and the bottom end of the rotating shaft passes through the inner wall of the elliptical groove and is movably connected.

[0011] Preferably, a deformable pad is fixedly connected to the inner wall of the trough body, and a plurality of holes are provided on the deformable pad for solution circulation. The center of the deformable pad is penetrated and rotatably connected with a cylindrical shell for discharging impurities in the solution. The bottom end of the cylindrical shell is penetrated and fixedly connected with a support sleeve, and the inner wall of the support sleeve is penetrated by a transmission shaft and connected for lifting and movement.

[0012] Preferably, the moving rod is provided with an auxiliary mechanism for pulling the cylindrical shell to move up and down, the auxiliary mechanism includes a first connecting seat fixedly connected to one end of the moving rod close to the rotating shaft, an adjusting rod for pushing the cylindrical shell to move up and down is rotatably connected to the first connecting seat via a pin shaft, the end of the adjusting rod away from the first connecting seat is rotatably connected to the second connecting seat via a pin shaft, and the second connecting seat is fixedly supported on the cylindrical shell.

[0013] Preferably, a conical block is fixedly connected to the end of the transmission shaft, and the conical block is in contact with and movably connected to the inner wall of the cylindrical shell, and collection frames for collecting impurities in the solution are penetrated and fixedly connected at symmetrical positions on both sides of the cylindrical shell near the bottom.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. Adding a heating system at the bottom of the tank can effectively maintain the temperature of the bottom of the tank and the circulation pipeline during standby, liquid replacement, and tank washing, thereby preventing crystal accumulation from clogging the pipeline and drainage pipeline, reducing circulation abnormalities caused by crystallization and the drainage time of liquid replacement and washing, and reducing the impact of crystallization contamination on the wet end tank.

[0015] 2. By mechanically driving the stirring blades to perform circular motion and rotation, a strong turbulence is formed in the solution inside the tank, which promotes the rapid dissolution and uniform distribution of the solute in the solution. The stirring blades not only perform circular motion in the tank, but also rotate in the process, generating flows in different directions, further enhancing the mixing effect of the solution. The rotational motion can increase the contact opportunity between the solute and the solvent and speed up the dissolution rate. Through such a stirring mode, the chemical reactants in the solution can be evenly distributed throughout the solution, improving the reaction rate and uniformity and preventing the formation of crystals.

[0016] 3. The deformable pad changes the shape of the bottom of the tank through lifting and lowering movements, and uses the hole and slot design to promote the dynamic flow of the solution and prevent the formation of local static or slow-flowing areas of the solution. The lifting and lowering action of the deformable pad allows the bottom solution to form flow channels of different shapes on the pad surface. When the deformable pad is in the shape of a frustum, it can concentrate the solution at the bottom of the tank to flow effectively through the holes and slots, thereby enhancing the fluidity of the liquid, reducing local supersaturation, and inhibiting the formation of crystals.

[0017] Fourth, through the lifting and lowering movement of the cylindrical shell, the conical block can be lifted and lowered synchronously inside the cylindrical shell, and the impurities around the cylindrical shell can be collected through the cylindrical shell into the collection frame under the action of the siphon phenomenon, thereby avoiding blockage of the trough and pipeline due to sediments, reducing equipment failures and downtime caused by impurity accumulation, extending the service life of the equipment, and improving the working efficiency of the equipment.

[0018] The coordinated use of the above-mentioned structure solves the problem that the existing cleaning of alkali crystals requires disassembly of the heating barrel, circulation pipeline, and soaking tank, and the crystals are difficult to clean, the cleaning takes a long time, the effect after cleaning is not good, the maintenance period is short, and the cleaning process will cause contamination of the tank body, thereby affecting the yield and production capacity of the photovoltaic cells, and therefore it is difficult to heat the solution inside the tank body. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a cross-sectional schematic diagram of the three-dimensional structure of the present invention; Figure 3 It is a cross-sectional schematic diagram of the three-dimensional structure of the tank body of the present invention; Figure 4 For the present invention Figure 3 Schematic diagram of the structure at A in the middle; Figure 5 This is a schematic diagram of the three-dimensional structure of the part where the sleeve rod is located in the present invention; Figure 6 It is a schematic cross-sectional view of the three-dimensional structure of the sleeve rod of the present invention; Figure 7 It is a schematic cross-sectional view of the three-dimensional structure of the cylindrical shell of the present invention; Figure 8 For the present invention Figure 7 Schematic diagram of the structure at B in the middle; Fig. 9 It is a schematic diagram of the three-dimensional structure of the part where the heating rod of the present invention is located.

[0020] In the figure: 1, tank body; 101, mounting groove; 102, elliptical groove; 2, heating rod; 3, liquid inlet pipe; 4, circulation pump; 5, heating device; 6, circulation pipeline; 7, liquid level sensor; 8, transmission shaft; 9, sleeve rod; 10, moving rod; 11, rotating shaft; 12, stirring fan blade; 13, gear; 14, deformation pad; 141, hole groove; 15, cylindrical shell; 16, support sleeve; 17, first connecting seat; 18, adjustment rod; 19, second connecting seat; 20, elliptical gear ring; 21, conical block; 22, collecting frame. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Embodiment 1:

[0023] See also Figures 1 to 9 The present invention provides a technical solution: a system for preventing crystallization of a wet process equipment using NaOH, comprising a tank body 1 supported and placed by an external bracket, with mounting grooves 101 provided at symmetrical positions on both sides of the tank body 1, and inner walls of the mounting grooves 101 on both sides are penetrated and fixedly connected with heating rods 2 for heating the solution inside the tank body 1, and a circulation mechanism for extracting the solution inside the tank body 1 for circulation heating is provided on the tank body 1; The circulation mechanism includes a heating device 5 for heating the solution fixedly connected to one side of the tank body 1, a liquid inlet pipe 3 is penetrated and fixedly connected to one end of the tank body 1 near the bottom, and the end of the liquid inlet pipe 3 away from the tank body 1 penetrates to the inner wall of the heating device 5 near the bottom, a circulation pump 4 connected to the liquid inlet pipe 3 is fixedly connected to one side of the tank body 1 near the heating device 5, a circulation pipe 6 is penetrated and fixedly connected to one side of the heating device 5 near the end, and the end of the circulation pipe 6 away from the heating device 5 penetrates to the inner wall of the bottom end of the tank body 1 and is fixedly connected.

[0024] The heating rod 2 is located at the bottom of the tank 1, and the heating rod 2 has two cylindrical rods with a power of 9 kW and a diameter of 5 cm. Both heating rods 2 are provided with quartz glass sleeves that are resistant to oxidation, high temperature and corrosion.

[0025] When in use, the tank body 1 is set up, and the tank body 1 is placed on the ground with the support of an external bracket. Through the installation groove 101 opened on the tank body 1 and the heating rod 2 arranged on the installation groove 101, the heating rod 2 can be installed through the installation groove 101 at the bottom of the tank body 1, and there are two heating rods 2, with a total heating power of 18kw, so that the heating rod 2 can heat the solution at the bottom of the tank body 1, and maintain the temperature of the solution inside the tank body 1 at a specific temperature to prevent crystal formation, and the outer contour of the heating rod 2 is provided with an anti-oxidation, high-temperature and corrosion-resistant quartz glass sleeve to ensure the stability of the heating rod 2 in high temperature and corrosive environments, providing a guarantee for long-term operation, and through the liquid inlet pipe 3 and the circulating pump 4 arranged on the tank body 1, the liquid inlet pipe 3 can heat the tank body 1 It is connected with the heating device 5 through the liquid inlet pipe 3 arranged on the tank body 1, and the circulation pump 4 is connected with the liquid inlet pipe 3, and the circulation pump 4 is started, so that the circulation pump 4 can draw the solution inside the tank body 1 to the inner wall of the heating device 5 through the liquid inlet pipe 3 for heating, and through the circulation pipeline 6 arranged on the heating device 5, and the circulation pipeline 6 connects the heating device 5 with the inner wall of the bottom end of the tank body 1, the solution heated inside the heating device 5 can be transported to the bottom of the tank body 1 through the circulation pipeline 6, and the solution is transported from bottom to top to the top of the tank body 1, and flows to the sub-tanks on both sides through the overflow hole on the tank body 1, thereby realizing the dynamic circulation of the solution inside the tank body 1, ensuring the uniformity of the solution temperature, reducing the supersaturated area at the bottom of the tank body 1, and preventing the formation of crystals.

[0026] A liquid level sensor 7 for monitoring the liquid level is fixedly connected to the inner wall of the bottom of the tank body 1 .

[0027] When in use, the liquid level sensor 7 provided on the tank body 1 can monitor the height of the solution inside the tank body 1 in real time. When the liquid level is lower than the safe range, the liquid level sensor sends a signal to trigger the external water replenishment device to prevent the heating rod 2 from drying out.

[0028] Embodiment 2:

[0029] On the basis of the first embodiment, further: The tank body 1 is provided with a stirring mechanism for uniformly stirring the internal solution, and the stirring mechanism includes a transmission shaft 8 that is penetrated through the bottom of the tank body 1 and is rotatably connected to it and driven by a power mechanism to rotate, a sleeve rod 9 is fixedly connected to the outer contour of the transmission shaft 8 near the end, and the inner wall of the sleeve rod 9 at one end away from the transmission shaft 8 is penetrated and movably connected to a moving rod 10 for telescopic movement, and the end of the moving rod 10 away from the sleeve rod 9 is penetrated and rotatably connected to a rotating shaft 11, and the end of the rotating shaft 11 is fixedly connected to a stirring fan blade 12 for stirring the solution inside the tank body 1.

[0030] The inner wall at the bottom of the trough body 1 is fixedly connected with an elliptical gear ring 20 that drives the rotating shaft 11 to rotate around a fixed axis. The outer contour of the rotating shaft 11 near the bottom is fixedly connected with a gear 13 that meshes with the elliptical gear ring 20 for transmission. An elliptical groove 102 that supports the rotating shaft 11 is opened at the bottom of the trough body 1. The bottom end of the rotating shaft 11 passes through the inner wall of the elliptical groove 102 and is movably connected.

[0031] When in use, through the transmission shaft 8 provided on the tank body 1, and the transmission shaft 8 is driven to rotate by the motor, the motor can drive the transmission shaft 8 to rotate on the tank body 1, through the sleeve rod 9 provided on the transmission shaft 8, and the moving rod 10 provided on the sleeve rod 9, the moving rod 10 is connected to the inner wall of the sleeve rod 9 for telescopic movement, through the rotating shaft 11 provided on the moving rod 10, and the sleeve rod 9 fixes the moving rod 10 on the transmission shaft 8, the sleeve rod 9 can drive the rotating shaft 11 to perform circular motion under the action of the transmission shaft 8, through the stirring blade 12 provided on the rotating shaft 11, the stirring blade 12 is fixedly supported on the rotating shaft 11, and at the same time the rotating shaft 11 drives the stirring blade 12 to rotate on the moving rod 10 The fixed-axis rotation connection is achieved through the elliptical groove 102 opened on the trough body 1. The elliptical groove 102 provides limited support for the rotating shaft 11. Through the elliptical toothed ring 20 set on the trough body 1 and the gear 13 set on the rotating shaft 11, the elliptical toothed ring 20 and the teeth on the gear 13 are meshed with each other, and the sleeve rod 9 drives the rotating shaft 11 to perform circular motion. Therefore, the gear 13 can drive the rotating shaft 11 and the stirring blades 12 to perform fixed-axis rotation on the moving rod 10 under the action of the elliptical toothed ring 20, and the rotation of the stirring blades 12 can generate turbulence inside the trough body 1, drive the solution to be effectively mixed, and then the solution in the solution can be more evenly distributed, avoiding the deposition or aggregation of crystalline substances.

[0032] like Figure 2 , Figure 3As shown, since the radius at both ends of the elliptical groove 102 is larger than the radius at both sides, when the sleeve rod 9 drives the rotating shaft 11 to perform a circular motion along one side of the elliptical groove 102 toward the end, the rotating shaft 11 can drive the moving rod 10 to extend in the direction away from the sleeve rod 9 under the action of the elliptical groove 102. When the sleeve rod 9 drives the rotating shaft 11 to perform a circular motion along the end of the elliptical groove 102 toward the adjacent side, the rotating shaft 11 can drive the moving rod 10 to retract in the direction close to the sleeve rod 9 under the action of the elliptical groove 102, thereby realizing the telescopic reciprocating motion of the moving rod 10 on the inner wall of the sleeve rod 9.

[0033] Embodiment three:

[0034] On the basis of the second embodiment, further: The inner wall of the trough body 1 is fixedly connected with a deformable pad 14, and a plurality of holes 141 for solution circulation are provided on the deformable pad 14. The center of the deformable pad 14 is penetrated and rotatably connected with a cylindrical shell 15 for discharging impurities in the solution. The bottom end of the cylindrical shell 15 is penetrated and fixedly connected with a support sleeve 16, and the inner wall of the support sleeve 16 is penetrated by the transmission shaft 8 and connected for lifting and movement.

[0035] The moving rod 10 is provided with an auxiliary mechanism for pulling the cylindrical shell 15 to move up and down, and the auxiliary mechanism includes a first connecting seat 17 fixedly connected to one end of the moving rod 10 close to the rotating shaft 11, and an adjusting rod 18 is rotatably connected to the first connecting seat 17 through a pin shaft to push the cylindrical shell 15 to move up and down, and the end of the adjusting rod 18 away from the first connecting seat 17 is rotatably connected to a second connecting seat 19 through a pin shaft, and the second connecting seat 19 is fixedly supported on the cylindrical shell 15.

[0036] The deformable pad 14 is fixedly supported on the inner wall of the trough body 1 by the deformable pad 14 arranged on the trough body 1, and the deformable pad 14 is made of polytetrafluoroethylene, has extremely strong chemical corrosion resistance, and can resist corrosion from strong alkaline solutions such as NaOH, and the hole groove 141 opened on the deformable pad 14, along with the circulation solution flowing from bottom to top, so that the solution can be evenly distributed and circulated through the hole groove 141, and the cylindrical shell 15 is arranged on the deformable pad 14, and the cylindrical shell 15 is rotatably connected on the deformable pad 14, and the support sleeve 16 is arranged on the cylindrical shell 15, and the support sleeve 16 is sleeved on the transmission shaft 8, so that the transmission shaft 8 can support the cylindrical shell 15 through the support sleeve 16.

[0037] The first connecting seat 17 is fixedly supported on the moving rod 10 through the first connecting seat 17 provided on the moving rod 10, and the second connecting seat 19 is fixedly supported on the cylindrical shell 15 through the adjusting rod 18 provided on the first connecting seat 17 and the second connecting seat 19 provided on the adjusting rod 18. With the two ends of the adjusting rod 18 being rotatably supported on the first connecting seat 17 and the second connecting seat 19, the adjusting rod 18 can support the position of the cylindrical shell 15, and with the moving rod 10 performing telescopic reciprocating motion on the inner wall of the sleeve rod 9, the adjusting rod 18 can push the cylindrical shell 15 and the support sleeve 16 to perform lifting and lowering reciprocating motion on the adjusting rod 18 under the action of the moving rod 10.

[0038] like Figure 1 , Figure 2 , Figure 3 and Figure 6 As shown, in the initial state, the deformable pad 14 is in a flat state. When the adjusting rod 18 pulls the cylindrical shell 15 to move in the downward vertical direction, and the cylindrical shell 15 is located at the center of the deformable pad 14, the deformable pad 14 is deformed into an inverted cone. As the deformable pad 14 changes from a flat state to an inverted cone, the fluidity of the liquid at the bottom of the trough body 1 and the hole groove 141 can be enhanced, the flow area of ​​the solution is increased, the flow efficiency of the fluid is improved, and the local supersaturation phenomenon is reduced, thereby inhibiting the generation of crystals and avoiding the formation of a static area at the bottom, which leads to the formation of crystals.

[0039] Embodiment 4:

[0040] On the basis of the third embodiment, further: The end of the transmission shaft 8 is fixedly connected with a conical block 21, and the conical block 21 is in contact with and movably connected to the inner wall of the cylindrical shell 15. The cylindrical shell 15 is penetrated and fixedly connected with collection frames 22 for collecting impurities in the solution at symmetrical positions on both sides near the bottom.

[0041] When in use, through the conical block 21 set on the cylindrical shell 15, the conical block 21 is in contact with and movably connected to the inner wall of the trough body 1, and the cylindrical shell 15 is lifted and lowered, so that the conical block 21 is synchronously lifted and lowered reciprocating on the inner wall of the cylindrical shell 15. Through the collection frame 22 set on the cylindrical shell 15, the collection frame 22 is connected to the inner wall of the cylindrical shell 15, and the collection frame 22 is fixedly supported on the cylindrical shell 15.

[0042] When the photovoltaic cell is treated by the solution in the tank 1, impurities on the surface of the photovoltaic cell fall onto the surface of the deformable pad 14. When the cylindrical shell 15 moves in the downward vertical direction, the deformable pad 14 is deformed into an inverted cone shape. Then, impurities on the surface of the deformable pad 14 move along the inclined surface of the deformable pad 14 to the periphery of the cylindrical shell 15, and some impurities enter the interior of the cylindrical shell 15 and fall to the end of the end of the conical block 21. When the cylindrical shell 15 moves downward to the limit distance, the conical block 21 moves out of the end of the cylindrical shell 15, and the conical block 21 is out of contact with the cylindrical shell 15. The impurities on the top of the conical block 21 fall along the inclined surface to the vicinity of the cylindrical shell 15. When the cylindrical shell 15 moves in an upward vertical direction, a siphon phenomenon occurs around the cylindrical shell 15, and the impurities around the cylindrical shell 15 can enter the inner wall of the cylindrical shell 15 along with the solution. As the conical block 21 moves to the inner wall of the cylindrical shell 15, the conical block 21 can push the impurities and solution inside the cylindrical shell 15 to the inner wall of the collecting frame 22 for collection, thereby cleaning the impurities in the solution inside the tank body 1, ensuring the cleanliness of the solution, and improving the self-cleaning ability of the wet process equipment.

[0043] Furthermore, the existing device can heat the solution inside the tank body when in use to prevent the formation of crystals, is easy to use, and is better than traditional products.

[0044] The standard parts used in this embodiment can be purchased directly from the market, and the non-standard structural components recorded in the specification and the drawings can also be directly processed according to the existing technical common sense. At the same time, the connection method of each component adopts the mature conventional means in the prior art, and the machinery, parts and equipment all adopt the conventional models in the prior art, so no specific description will be given here.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A system for preventing crystallization of a wet process equipment using NaOH, characterized in that: The invention comprises a tank body (1) supported by an external bracket, wherein mounting grooves (101) are provided at symmetrical positions on both sides of the tank body (1), and heating rods (2) for heating the solution inside the tank body (1) are penetrated and fixedly connected to the inner walls of the mounting grooves (101) on both sides, and the tank body (1) is provided with a circulation mechanism for extracting the solution inside the tank body (1) for circulating heating; The circulation mechanism comprises a heating device (5) for heating the solution fixedly connected to one side of the tank body (1); a liquid inlet pipe (3) is penetrated and fixedly connected to one end of the tank body (1) near the bottom, and the end of the liquid inlet pipe (3) away from the tank body (1) penetrates to the inner wall of the heating device (5) near the bottom; a circulation pump (4) connected to the liquid inlet pipe (3) is fixedly connected to one side of the tank body (1) near the heating device (5); a circulation pipe (6) is penetrated and fixedly connected to one side of the heating device (5) near the end, and the end of the circulation pipe (6) away from the heating device (5) penetrates to the inner wall of the bottom end of the tank body (1) and is fixedly connected.

2. A system for preventing crystallization using NaOH in a wet process equipment according to claim 1, characterized in that: The heating rod (2) is located at the bottom of the tank body (1), and the heating rod (2) has two cylindrical rods with a power of 9 kW and a diameter of 5 cm. Both heating rods (2) are provided with quartz glass sleeves that are resistant to oxidation, high temperature and corrosion.

3. A system for preventing crystallization using NaOH in a wet process equipment according to claim 2, characterized in that: A liquid level sensor (7) for monitoring the liquid level is fixedly connected to the inner wall of the bottom of the tank body (1).

4. A system for preventing crystallization using NaOH in a wet process equipment according to claim 3, characterized in that: The tank body (1) is provided with a stirring mechanism for uniformly stirring the solution inside. The stirring mechanism comprises a transmission shaft (8) which is penetrated through the bottom of the tank body (1) and is rotatably connected to the bottom of the tank body (1) and is driven to rotate by a power mechanism. A sleeve rod (9) is fixedly connected to the outer contour of the transmission shaft (8) near the end. The inner wall of the sleeve rod (9) at one end away from the transmission shaft (8) is penetrated and movably connected to a moving rod (10) which can be telescopically moved. The end of the moving rod (10) away from the sleeve rod (9) is penetrated and rotatably connected to a rotating shaft (11). The end of the rotating shaft (11) is fixedly connected to a stirring blade (12) for stirring the solution inside the tank body (1).

5. A system for preventing crystallization using NaOH in a wet process equipment according to claim 4, characterized in that: An elliptical toothed ring (20) is fixedly connected to the inner wall of the bottom of the trough body (1) for driving the rotating shaft (11) to rotate about a fixed axis; a gear (13) is fixedly connected to the outer contour of the rotating shaft (11) near the bottom end for meshing with the elliptical toothed ring (20); an elliptical groove (102) for supporting the rotating shaft (11) is provided at the bottom of the trough body (1); and the bottom end of the rotating shaft (11) passes through the inner wall of the elliptical groove (102) and is movably connected thereto.

6. A system for preventing crystallization using NaOH in a wet process equipment according to claim 5, characterized in that: The inner wall of the trough body (1) is fixedly connected to a deformable pad (14), and the deformable pad (14) is provided with a plurality of holes (141) for the solution to circulate, the center of the deformable pad (14) is penetrated and rotatably connected to a cylindrical shell (15) for discharging impurities in the solution, the bottom end of the cylindrical shell (15) is penetrated and fixedly connected to a support sleeve (16), and the inner wall of the support sleeve (16) is penetrated by a transmission shaft (8) and is connected in a lifting and moving manner.

7. A system for preventing crystallization using NaOH in a wet process equipment according to claim 6, characterized in that: The moving rod (10) is provided with an auxiliary mechanism for pulling the columnar shell (15) to move up and down, the auxiliary mechanism comprising a first connecting seat (17) fixedly connected to one end of the moving rod (10) close to the rotating shaft (11), an adjusting rod (18) rotatably connected to the first connecting seat (17) via a pin shaft for pushing the columnar shell (15) to move up and down, and an end of the adjusting rod (18) away from the first connecting seat (17) rotatably connected to a second connecting seat (19) via a pin shaft, and the second connecting seat (19) is fixedly supported on the columnar shell (15).

8. A system for preventing crystallization using NaOH in a wet process equipment according to claim 7, characterized in that: A conical block (21) is fixedly connected to the end of the transmission shaft (8), and the conical block (21) is in contact with and movably connected to the inner wall of the cylindrical shell (15). Collection frames (22) for collecting impurities in the solution are penetrated and fixedly connected at symmetrical positions on both sides of the cylindrical shell (15) near the bottom.

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