Evaporative crystallization device for high-purity anhydrous sodium sulphate

Abstract

The invention discloses an evaporative crystallization device for high-purity anhydrous sodium sulphate, and relates to the technical field of anhydrous sodium sulphate processing, and the evaporative crystallization device is characterized by comprising an evaporation tank and a spraying and scraping mechanism, the spraying and scraping mechanism is arranged on the evaporation tank and comprises a spraying pipe, a spraying head, a vertical shaft, a cross arm, a scraping plate and a driving assembly, the spraying pipe is rotationally connected with the evaporation tank, the spraying head is installed at the end, located in the evaporation tank, of the spraying pipe, a spraying opening of the spraying head faces the inner side wall of the evaporation tank, and the spraying pipe is fixedly connected with the vertical shaft; the vertical shaft is fixedly connected with a plurality of cross arms, the cross arms are fixedly connected with a scraper blade, and the scraper blade is in friction contact with the inner wall of the evaporation tank; the driving assembly drives the spraying pipe and the spraying head to rotate, when a solution sprayed by the spraying head makes contact with the high-temperature inner side wall of the evaporation tank, water in the solution can be rapidly evaporated, and therefore separation of sodium sulfate crystals in the solution is accelerated, and the evaporation and crystallization efficiency is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of sodium sulphate processing, and more specifically to an evaporation and crystallization device for high-purity sodium sulphate. Background Art

[0002] The scientific name of Sodium Sulfate Anhydrous is white monoclinic fine crystals or powder, with a relative density of 2.68 and a melting point of 884°C. It is soluble in water and its aqueous solution is neutral. It is an important chemical raw material and is widely used in many industries. In the chemical industry, Sodium Sulfate is the main raw material for the production of chemical products such as sodium sulfide and sodium silicate; in the papermaking industry, it is used as a cooking agent in the manufacture of sulfate pulp; in the glass industry, it can be used instead of soda ash. In addition, Sodium Sulfate can also be used as a filler for synthetic detergents, and in the medical field, it is used as a laxative and detoxifier.

[0003] Evaporation crystallization is the core process in the production of sodium sulphate. It makes the solution supersaturated by evaporating water, prompting the precipitation of sodium sulfate crystals, thereby achieving the separation and purification of sodium sulphate. It can not only improve the purity of the product, control the crystal size and morphology, but also adapt to different raw materials and production processes to improve production efficiency. Therefore, evaporation crystallization technology is of great significance to the efficiency, economy and environmental protection of sodium sulphate production, and is an indispensable key link in the modern sodium sulphate production process.

[0004] However, most existing evaporation crystallizations directly heat the entire solution, and the entire solution is heated slowly, resulting in a long time required to heat each batch of solution to the evaporation temperature, and the efficiency of evaporation crystallization is low. Summary of the invention

[0005] In view of the shortcomings of the prior art, the object of the present invention is to provide an evaporation and crystallization device for high-purity sodium sulphate.

[0006] To achieve the above object, the present invention provides the following technical solutions: an evaporation crystallization device for high-purity sodium sulfate, comprising an evaporation tank, a spraying and scraping mechanism, a feeding mechanism and a drying mechanism;

[0007] The evaporator is fixedly connected with a heating jacket, and the heating jacket is connected with a medium inlet pipe and a medium outlet pipe;

[0008] The spraying and scraping mechanism is arranged on the evaporation tank, and is used to spray the solution on the inner wall of the evaporation tank and scrape off the crystals on the inner wall of the evaporation tank. The spraying and scraping mechanism comprises a spray pipe, a nozzle, a vertical shaft, a horizontal arm, a scraper and a driving assembly. The spray pipe is rotatably connected to the evaporation tank, and a nozzle is installed at one end of the spray pipe located inside the evaporation tank, and the nozzle of the nozzle faces the inner wall of the evaporation tank. The spray pipe is fixedly connected to the vertical shaft, and a plurality of horizontal arms are fixedly connected to the vertical shaft. The plurality of horizontal arms are fixedly connected to the scraper, and the scraper rubs against the inner wall of the evaporation tank;

[0009] The driving assembly is connected to the spray pipe, and the driving assembly is used to drive the spray pipe to rotate;

[0010] The feeding mechanism is arranged on one side of the evaporation tank, and is used to feed the solution into the spray pipe;

[0011] The drying mechanism is arranged on the evaporation tank, and is used for drying the crystals scraped off by the scraper.

[0012] A further technical solution of the present application is as follows: the driving assembly includes a frame, a motor, a first synchronous wheel, a synchronous belt and a second synchronous wheel; the frame is fixedly connected to the evaporator tank; a motor is mounted on the frame; a first synchronous wheel is fixedly connected to an output shaft of the motor; the first synchronous wheel is connected to a second synchronous wheel via a synchronous belt transmission; and the second synchronous wheel is fixedly connected to a spray pipe.

[0013] A further technical solution of the present application is as follows: the feeding mechanism comprises a solution tank, a feed pipe, a water pump, an extraction pipe and a delivery pipe, the solution tank is arranged on one side of the evaporation tank, the solution tank is connected with a feed pipe, the solution tank is installed with a water pump, the liquid inlet of the water pump is connected with an extraction pipe, one end of the extraction pipe away from the water pump is connected with the solution tank, the liquid outlet of the water pump is connected with a delivery pipe, and one end of the delivery pipe away from the water pump is connected with the spray pipe through a rotary joint.

[0014] A further technical solution of the present application is as follows: a collecting tank is fixedly connected to the inner wall of the evaporation tank, a reflux pipe is fixedly connected to the evaporation tank, one end of the reflux pipe is connected to the collecting tank, and the other end of the reflux pipe is connected to the solution tank.

[0015] A further technical solution of the present application is as follows: a support plate is fixedly connected to the scraper, the support plate is located above the collecting tank, and the support plate rubs against the inner wall of the evaporation tank.

[0016] The present application has a further technical solution: the drying mechanism comprises a drying tank, a heating plate, an air inlet pipe, an air outlet pipe, a cross bar, a push plate and a heat recovery component; the drying tank is fixedly connected to the lower end of the evaporation tank, the upper end of the drying tank is communicated with the lower end of the evaporation tank, the interior of the drying tank is fixedly connected with the heating plate, the interior of the heating plate is hollow, the heating plate is communicated with the air inlet pipe and the air outlet pipe, the end of the air outlet pipe away from the heating plate passes through the side wall of the drying tank, the lower end of the vertical shaft is rotatably connected to the heating plate, a plurality of cross bars are fixedly connected to the vertical shaft, a plurality of push plates are respectively fixedly connected to the plurality of cross bars, and the plurality of push plates are all in frictional contact with the heating plate;

[0017] The heat recovery component is used to recover the heat of the water vapor in the evaporation tank and transport hot air into the air inlet pipe.

[0018] A further technical solution of the present application is as follows: the heat recovery component comprises a heat exchange tank, an air inlet pipe, an air outlet pipe, a collecting ring, a collecting pipe, an upper plate, a lower plate, a heat exchange pipe and a fan. The heat exchange tank is arranged on one side of the evaporator tank, the heat exchange tank is connected with an air inlet pipe and an air outlet pipe, the end of the air inlet pipe away from the heat exchange tank is connected with the collecting ring, the collecting ring is connected with multiple collecting pipes, and the ends of the multiple collecting pipes away from the collecting ring are all connected with the upper end of the evaporator tank, the upper plate and the lower plate are fixedly connected inside the heat exchange tank, the air inlet pipe and the air outlet pipe are both located between the upper plate and the lower plate, a plurality of heat exchange pipes are fixedly connected between the upper plate and the lower plate, the upper ends of the plurality of heat exchange pipes are all connected with the upper side of the upper plate, and the lower ends of the plurality of heat exchange pipes are all connected with the lower side of the lower plate, a fan is installed on the heat exchange tank, the air inlet of the fan is connected with the lower end of the heat exchange tank, and the air outlet of the fan is connected with the air inlet pipe.

[0019] A further technical solution of the present application is as follows: a filter screen is fixedly connected to the upper end of the heat exchange tank.

[0020] A further technical solution of the present application is as follows: a vortex sheet is fixedly connected to the interior of the heating plate.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The solution is sprayed onto the inner wall of the evaporation tank through the nozzle. When the sprayed solution contacts the high-temperature inner wall of the evaporation tank, the water in the solution will evaporate quickly, thereby accelerating the precipitation of sodium sulfate crystals in the solution; the spray pipe and the nozzle are driven to rotate by the driving component, the spray pipe drives the vertical axis to rotate, and the vertical axis drives the scraper to rotate through multiple cross arms. The scraper can scrape off the crystals precipitated on the inner wall of the evaporation tank, and then cooperate with the nozzle that rotates and continuously sprays the solution, so that the solution can be evaporated and crystallized continuously and the crystals can be scraped off and collected. Compared with the existing method of directly heating the solution as a whole, the present application can quickly and continuously evaporate the water in the solution, thereby effectively improving the efficiency of evaporation and crystallization;

[0023] 2. The solution that has not been completely evaporated and crystallized will flow along the inner wall of the evaporation tank to the collecting tank. The solution in the collecting tank can flow back to the solution tank through the reflux pipe, so as to continue to participate in evaporation and crystallization, avoiding the waste of raw materials;

[0024] 3. The vertical axis can drive multiple cross bars to rotate, and the multiple cross bars respectively drive the multiple push plates thereon to move. During the movement, the multiple push plates can continuously push the crystals in the center of the heating plate to the edge of the heating plate, and push the dried crystals off the heating plate, so that the crystals falling on the heating plate can be dried continuously, with good continuity and high drying efficiency;

[0025] 4. The water vapor in the evaporator can exchange heat with the air in multiple heat exchange tubes, thereby heating the air in the multiple heat exchange tubes. The fan can extract the hot air in the multiple heat exchange tubes and send the hot air into the air inlet pipe, thereby recycling the heat of the water vapor in the evaporator. No additional energy is needed to heat the air, effectively saving energy consumption.

[0026] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. The specific implementation of the present invention is given in detail by the following embodiments and their accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0028] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0029] Figure 2 A cross-sectional view of a heating jacket according to an embodiment of the present invention;

[0030] Figure 3For the embodiment of the present invention Figure 2 Enlarged view of point A in the middle;

[0031] Figure 4 A cross-sectional view of an evaporation tank according to an embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of the drying mechanism structure of an embodiment of the present invention;

[0033] Figure 6 A cross-sectional view of a heat exchange tank according to an embodiment of the present invention;

[0034] Figure 7 4 is a cross-sectional view of a heating plate according to an embodiment of the present invention.

[0035] In the figure: 1, evaporation tank; 2, heating jacket; 3, medium inlet pipe; 4, medium outlet pipe; 5, spray pipe; 6, nozzle; 7, vertical axis; 8, horizontal arm; 9, scraper; 10, frame; 11, motor; 12, first synchronous wheel; 13, synchronous belt; 14, second synchronous wheel; 15, solution tank; 16, feed pipe; 17, water pump; 18, extraction pipe; 19, conveying pipe; 20, collecting tank; 21, reflux pipe; 22, support plate; 23, drying tank; 24, heating plate; 25, air inlet pipe; 26, air outlet pipe; 27, horizontal bar; 28, push plate; 29, heat exchange tank; 30, air inlet pipe; 31, air outlet pipe; 32, collecting ring; 33, collecting pipe; 34, upper plate; 35, lower plate; 36, heat exchange pipe; 37, fan; 38, filter screen; 39, vortex sheet. DETAILED DESCRIPTION

[0036] 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.

[0037] In the description of the embodiments of the present invention, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the invented product is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0038] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be connected, detachably connected, or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] Reference Figures 1 to 7 In one embodiment of the present application, an evaporation crystallization device of high-purity sodium sulphate comprises an evaporation tank 1, a spraying and scraping mechanism, a feeding mechanism and a drying mechanism;

[0040] The evaporator 1 is fixedly connected with a heating jacket 2, and the heating jacket 2 is connected with a medium inlet pipe 3 and a medium outlet pipe 4. Figure 1 and Figure 2 , the heating medium enters the heating jacket 2 through the medium inlet pipe 3, and is discharged from the heating jacket 2 through the medium outlet pipe 4, thereby heating the evaporator 1;

[0041] The spraying and scraping mechanism is arranged on the evaporation tank 1, and is used to spray the solution on the inner wall of the evaporation tank 1 and scrape off the crystals on the inner wall of the evaporation tank 1. The spraying and scraping mechanism comprises a spray pipe 5, a nozzle 6, a vertical shaft 7, a horizontal arm 8, a scraper 9 and a driving assembly. The spray pipe 5 is rotatably connected to the evaporation tank 1, and the end of the spray pipe 5 located inside the evaporation tank 1 is provided with a nozzle 6, and the nozzle of the nozzle 6 faces the inner wall of the evaporation tank 1. The spray pipe 5 is fixedly connected with the vertical shaft 7, and a plurality of horizontal arms 8 are fixedly connected with the vertical shaft 7. The plurality of horizontal arms 8 are fixedly connected with the scraper 9, and the scraper 9 rubs against the inner wall of the evaporation tank 1;

[0042] The driving assembly is connected to the spray pipe 5, and the driving assembly is used to drive the spray pipe 5 to rotate;

[0043] The feeding mechanism is arranged on one side of the evaporation tank 1, and is used to feed the solution into the spray pipe 5;

[0044] like Figure 2 , the solution is fed into the spray pipe 5 through the feeding mechanism, and the solution in the spray pipe 5 is sprayed onto the inner wall of the evaporation tank 1 through the nozzle 6. When the sprayed solution contacts the high-temperature inner wall of the evaporation tank 1, the water in the solution will evaporate quickly, thereby accelerating the precipitation of sodium sulfate crystals in the solution;

[0045] The spray pipe 5 and the nozzle 6 are driven to rotate by the driving assembly, and the spray pipe 5 can drive the vertical shaft 7 to rotate. The vertical shaft 7 drives the scraper 9 to rotate through multiple cross arms 8. The scraper 9 can scrape off the crystals precipitated on the inner wall of the evaporation tank 1, and then cooperate with the nozzle 6 that rotates and continuously sprays the solution, so that the solution can be evaporated and crystallized continuously and the crystals can be scraped off and collected. Compared with the existing method of directly heating the entire solution, the present application can quickly and continuously evaporate the water in the solution, thereby effectively improving the efficiency of evaporation and crystallization.

[0046] The drying mechanism is arranged on the evaporation tank 1 , and is used for drying the crystals scraped off by the scraper 9 .

[0047] As a preferred embodiment of the present application, the driving assembly includes a frame 10, a motor 11, a first synchronous wheel 12, a synchronous belt 13 and a second synchronous wheel 14. The frame 10 is fixedly connected to the evaporator 1. The motor 11 is installed on the frame 10. The output shaft of the motor 11 is fixedly connected to the first synchronous wheel 12. The first synchronous wheel 12 is connected to the second synchronous wheel 14 through the synchronous belt 13. The second synchronous wheel 14 is fixedly connected to the spray pipe 5.

[0048] like Figure 3 The output shaft of the motor 11 can drive the first synchronous wheel 12 to rotate, the first synchronous wheel 12 drives the second synchronous wheel 14 to rotate through the synchronous belt 13, and the second synchronous wheel 14 can drive the spray pipe 5 to rotate.

[0049] As a preferred embodiment of the present application, the feeding mechanism includes a solution tank 15, a feed pipe 16, a water pump 17, an extraction pipe 18 and a delivery pipe 19. The solution tank 15 is arranged on one side of the evaporation tank 1, and the solution tank 15 is connected with the feed pipe 16. The solution tank 15 is installed with a water pump 17. The liquid inlet of the water pump 17 is connected with the extraction pipe 18. The end of the extraction pipe 18 away from the water pump 17 is connected with the solution tank 15. The liquid outlet of the water pump 17 is connected with the delivery pipe 19. The end of the delivery pipe 19 away from the water pump 17 is connected with the spray pipe 5 through a rotary joint.

[0050] like Figure 2 The solution to be evaporated and crystallized is fed into the solution tank 15 through the feed pipe 16, and the water pump 17 can extract the solution in the solution tank 15 through the extraction pipe 18, and pump it into the spray pipe 5 through the delivery pipe 19, and the delivery pipe 19 is connected to the spray pipe 5 through a rotary joint, which does not affect the rotation of the spray pipe 5.

[0051] As a preferred embodiment of the present application, a collecting tank 20 is fixedly connected to the inner wall of the evaporation tank 1, and a reflux pipe 21 is fixedly connected to the evaporation tank 1, one end of the reflux pipe 21 is connected to the collecting tank 20, and the other end of the reflux pipe 21 is connected to the solution tank 15;

[0052] like Figure 2 and Figure 4 The solution that has not been completely evaporated and crystallized will flow along the inner wall of the evaporation tank 1 to the collecting tank 20, and the solution in the collecting tank 20 can flow back to the solution tank 15 through the reflux pipe 21, so as to continue to participate in evaporation and crystallization, avoiding waste of raw materials.

[0053] As a preferred embodiment of the present application, a support plate 22 is fixedly connected to the scraper 9, and the support plate 22 is located above the collecting tank 20, and the support plate 22 rubs against the inner wall of the evaporation tank 1;

[0054] like Figure 2 and Figure 4 The support plate 22 can prevent the crystals scraped off by the scraper 9 from falling into the collecting tank 20.

[0055] As a preferred embodiment of the present application, the drying mechanism includes a drying tank 23, a heating disk 24, an air inlet pipe 25, an air outlet pipe 26, a cross bar 27, a push plate 28 and a heat recovery component. The drying tank 23 is fixedly connected to the lower end of the evaporation tank 1, and the upper end of the drying tank 23 is communicated with the lower end of the evaporation tank 1. The interior of the drying tank 23 is fixedly connected with the heating disk 24, and the interior of the heating disk 24 is hollow. The heating disk 24 is communicated with the air inlet pipe 25 and the air outlet pipe 26, and the end of the air outlet pipe 26 away from the heating disk 24 passes through the side wall of the drying tank 23, the lower end of the vertical shaft 7 is rotatably connected to the heating disk 24, and a plurality of cross bars 27 are fixedly connected to the vertical shaft 7, and a plurality of push plates 28 are respectively fixedly connected to the plurality of cross bars 27, and the plurality of push plates 28 are all in frictional contact with the heating disk 24;

[0056] The heat recovery component is used to recover the heat of the water vapor in the evaporation tank 1 and transport the hot air into the air inlet pipe 25;

[0057] like Figure 2 and Figure 5 The crystals scraped off by the scraper 9 will fall on the center of the heating plate 24, and the hot air will be transported to the air inlet pipe 25 through the heat recovery component. The hot air will enter the heating plate 24 along the air inlet pipe 25, thereby heating the heating plate 24 and drying the crystals on the heating plate 24;

[0058] The vertical axis 7 can drive the multiple cross bars 27 to rotate, and the multiple cross bars 27 respectively drive the multiple push plates 28 thereon to move, and the multiple push plates 28 are all placed at an angle. During the movement, the multiple push plates 28 can continuously push the crystals in the center of the heating disk 24 to the edge of the heating disk 24, and push the dried crystals off the heating disk 24, so that the crystals that fall onto the heating disk 24 can be continuously dried, with good continuity and high drying efficiency.

[0059] As a preferred embodiment of the present application, the heat recovery component includes a heat exchange tank 29, an air inlet pipe 30, an air outlet pipe 31, a collecting ring 32, a collecting pipe 33, an upper plate 34, a lower plate 35, a heat exchange pipe 36 and a fan 37. The heat exchange tank 29 is arranged on one side of the evaporation tank 1. The heat exchange tank 29 is connected with the air inlet pipe 30 and the air outlet pipe 31. The end of the air inlet pipe 30 away from the heat exchange tank 29 is connected with the collecting ring 32. The collecting ring 32 is connected with a plurality of collecting pipes 33. The ends of the plurality of collecting pipes 33 away from the collecting ring 32 are all connected to the upper end of the evaporation tank 1. The heat exchange tank 29 is fixedly connected with an upper plate 34 and a lower plate 35 inside, the air inlet pipe 30 and the air outlet pipe 31 are both located between the upper plate 34 and the lower plate 35, a plurality of heat exchange tubes 36 are fixedly connected between the upper plate 34 and the lower plate 35, the upper ends of the plurality of heat exchange tubes 36 are all connected to the upper part of the upper plate 34, the lower ends of the plurality of heat exchange tubes 36 are all connected to the lower part of the lower plate 35, a fan 37 is installed on the heat exchange tank 29, the air inlet of the fan 37 is connected to the lower end of the heat exchange tank 29, and the air outlet of the fan 37 is connected to the air inlet pipe 25;

[0060] like Figure 1 and Figure 6 The water vapor in the evaporator 1 will enter the collecting ring 32 through the multiple collecting pipes 33, and enter the heat exchange tank 29 along the air inlet pipe 30, and the water vapor can exchange heat with the air in the multiple heat exchange pipes 36, thereby heating the air in the multiple heat exchange pipes 36, and the water vapor after heat exchange is discharged through the air outlet pipe 31;

[0061] The fan 37 can extract the hot air in the multiple heat exchange tubes 36 and send the hot air into the air inlet pipe 25, so as to recycle the heat of the water vapor in the evaporator 1. No additional energy is needed to heat the air, which effectively saves energy consumption.

[0062] As a preferred embodiment of the present application, a filter screen 38 is fixedly connected to the upper end of the heat exchange tank 29 to prevent dust from being sucked in.

[0063] As a preferred embodiment of the present application, the interior of the heating plate 24 is fixedly connected with a spiral sheet 39, such as Figure 7The hot air needs to move along the vortex sheet 39 before it can be finally discharged through the air outlet pipe 26, thereby extending the residence time of the hot air in the heating plate 24 and making full use of the heat contained in the hot air.

[0064] Working principle: The solution is fed into the spray pipe 5 through the feeding mechanism, and the solution in the spray pipe 5 is sprayed onto the inner wall of the evaporation tank 1 through the nozzle 6. When the sprayed solution contacts the high-temperature inner wall of the evaporation tank 1, the water in the solution will evaporate quickly, thereby accelerating the precipitation of sodium sulfate crystals in the solution;

[0065] The spray pipe 5 and the nozzle 6 are driven to rotate by the driving assembly, and the spray pipe 5 can drive the vertical shaft 7 to rotate. The vertical shaft 7 drives the scraper 9 to rotate through multiple cross arms 8. The scraper 9 can scrape off the crystals precipitated on the inner wall of the evaporation tank 1, and then cooperate with the nozzle 6 that rotates and continuously sprays the solution, so that the solution can be evaporated and crystallized continuously and the crystals can be scraped off and collected.

[0066] It should be noted that the electrical components appearing in this application document are all electrically connected to the external main controller and the 220V AC power supply, and the main controller can be a processor, an alarm module, a drive module, etc., which play a role in controlling conventional known equipment. The standard parts used in this application document can all be purchased from the market, and the specific connection methods of each part are connected by conventional means such as mature bolts, rivets, welding, etc. in the prior art. In addition, the machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, so no specific description will be made here.

[0067] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

[0068] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An evaporation crystallization device for high-purity sodium sulphate, characterized in that: It comprises an evaporation tank (1), a spraying and scraping mechanism, a feeding mechanism and a drying mechanism; The evaporator (1) is fixedly connected to a heating jacket (2), and the heating jacket (2) is connected to a medium inlet pipe (3) and a medium outlet pipe (4); The spraying and scraping mechanism is arranged on the evaporation tank (1), and is used for spraying the solution on the inner wall of the evaporation tank (1) and scraping off the crystals on the inner wall of the evaporation tank (1). The spraying and scraping mechanism comprises a spray pipe (5), a spray head (6), a vertical shaft (7), a horizontal arm (8), a scraper (9) and a driving assembly. The spray pipe (5) is rotatably connected to the evaporation tank (1). The spray head (6) is installed at one end of the spray pipe (5) located inside the evaporation tank (1), and the nozzle of the spray head (6) faces the inner wall of the evaporation tank (1). The spray pipe (5) is fixedly connected to the vertical shaft (7), and a plurality of horizontal arms (8) are fixedly connected to the vertical shaft (7). The plurality of horizontal arms (8) are fixedly connected to the scraper (9), and the scraper (9) is in frictional contact with the inner wall of the evaporation tank (1). The driving assembly is connected to the spray pipe (5), and the driving assembly is used to drive the spray pipe (5) to rotate; The feeding mechanism is arranged on one side of the evaporation tank (1), and is used to feed the solution into the spray pipe (5); The drying mechanism is arranged on the evaporation tank (1), and is used to dry the crystals scraped off by the scraper (9).

2. The evaporation crystallization device of high-purity sodium sulfate according to claim 1, characterized in that: The driving assembly comprises a frame (10), a motor (11), a first synchronous wheel (12), a synchronous belt (13) and a second synchronous wheel (14); the frame (10) is fixedly connected to the evaporation tank (1); the motor (11) is mounted on the frame (10); the first synchronous wheel (12) is fixedly connected to the output shaft of the motor (11); the first synchronous wheel (12) is connected to the second synchronous wheel (14) via a synchronous belt (13); and the second synchronous wheel (14) is fixedly connected to the spray pipe (5).

3. The evaporation and crystallization device of high-purity sodium sulfate according to claim 1, characterized in that: The feeding mechanism comprises a solution tank (15), a feeding pipe (16), a water pump (17), an extraction pipe (18) and a delivery pipe (19); the solution tank (15) is arranged on one side of the evaporation tank (1); the solution tank (15) is connected to the feeding pipe (16); the solution tank (15) is installed with a water pump (17); the liquid inlet of the water pump (17) is connected to the extraction pipe (18); one end of the extraction pipe (18) away from the water pump (17) is connected to the solution tank (15); the liquid outlet of the water pump (17) is connected to the delivery pipe (19); and one end of the delivery pipe (19) away from the water pump (17) is connected to the spray pipe (5) through a rotary joint.

4. The evaporation and crystallization device of high-purity sodium sulfate according to claim 3, characterized in that: A collecting tank (20) is fixedly connected to the inner wall of the evaporation tank (1), and a reflux pipe (21) is fixedly connected to the evaporation tank (1), one end of the reflux pipe (21) is connected to the collecting tank (20), and the other end of the reflux pipe (21) is connected to the solution tank (15).

5. The evaporation and crystallization device of high-purity sodium sulfate according to claim 4, characterized in that: A support plate (22) is fixedly connected to the scraper (9), the support plate (22) is located above the collecting tank (20), and the support plate (22) is in frictional contact with the inner wall of the evaporation tank (1).

6. The evaporation and crystallization device of high-purity sodium sulfate according to claim 1, characterized in that: The drying mechanism comprises a drying tank (23), a heating plate (24), an air inlet pipe (25), an air outlet pipe (26), a cross bar (27), a push plate (28) and a heat recovery component. The drying tank (23) is fixedly connected to the lower end of the evaporation tank (1). The upper end of the drying tank (23) is communicated with the lower end of the evaporation tank (1). The interior of the drying tank (23) is fixedly connected to the heating plate (24). The interior of the heating plate (24) is hollow. The plate (24) is connected with an air inlet pipe (25) and an air outlet pipe (26); one end of the air outlet pipe (26) away from the heating plate (24) penetrates the side wall of the drying tank (23); the lower end of the vertical shaft (7) is rotatably connected to the heating plate (24); a plurality of cross bars (27) are fixedly connected to the vertical shaft (7); a plurality of push plates (28) are respectively fixedly connected to the plurality of cross bars (27); and the plurality of push plates (28) are all in frictional contact with the heating plate (24); The heat recovery component is used to recover the heat of water vapor in the evaporation tank (1) and to deliver hot air to the air inlet pipe (25).

7. The evaporation and crystallization device of high-purity sodium sulfate according to claim 6, characterized in that: The heat recovery component comprises a heat exchange tank (29), an air inlet pipe (30), an air outlet pipe (31), a collecting ring (32), a collecting pipe (33), an upper plate (34), a lower plate (35), a heat exchange pipe (36) and a fan (37). The heat exchange tank (29) is arranged on one side of the evaporation tank (1). The heat exchange tank (29) is connected to the air inlet pipe (30) and the air outlet pipe (31). The end of the air inlet pipe (30) away from the heat exchange tank (29) is connected to the collecting ring (32). The collecting ring (32) is connected to a plurality of collecting pipes (33). The ends of the plurality of collecting pipes (33) away from the collecting ring (32) are all connected to the upper end of the evaporation tank (1). An upper plate (34) and a lower plate (35) are fixedly connected inside the tank (29); the air inlet pipe (30) and the air outlet pipe (31) are both located between the upper plate (34) and the lower plate (35); a plurality of heat exchange tubes (36) are fixedly connected between the upper plate (34) and the lower plate (35); the upper ends of the plurality of heat exchange tubes (36) are all connected to the upper part of the upper plate (34); the lower ends of the plurality of heat exchange tubes (36) are all connected to the lower part of the lower plate (35); a fan (37) is installed on the heat exchange tank (29); the air inlet of the fan (37) is connected to the lower end of the heat exchange tank (29); and the air outlet of the fan (37) is connected to the air inlet pipe (25).

8. The evaporation and crystallization device of high-purity sodium sulfate according to claim 7, characterized in that: The upper end of the heat exchange tank (29) is fixedly connected with a filter screen (38).

9. The evaporation and crystallization device of high-purity sodium sulfate according to claim 6, characterized in that: A vortex sheet (39) is fixedly connected to the interior of the heating plate (24).

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