Evaporative crystallization equipment

Abstract

The utility model discloses evaporative crystallization equipment, and relates to the technical field of chemical production. The device is technically characterized by comprising a crystallization reaction barrel body, wherein a heating assembly is arranged on one side of the crystallization reaction barrel body; the bottom of the crystallization reaction barrel body is communicated with a secondary separation bin through a throat pipe, and the lower side of the secondary separation bin is connected with a filtering device through a first discharge pipe; a filter plate is arranged in the second-stage separation bin, the upper side and the lower side of the filter plate are connected with the second-stage separation bin and the horizontal baffle correspondingly, and a backflow pipe is arranged on one side of the second-stage separation bin; the other end of the backflow pipe is connected with a lifting water pump, and the water outlet end of the lifting water pump is communicated with the internal space of the crystallization reaction barrel body through a second discharge pipe. The lifting water pump can perform secondary separation on the raw material solution containing the mirabilite crystals in the secondary separation bin through the backflow pipe, so that the proportion of liquid in the solution containing the mirabilite crystals is reduced, the workload of filtering equipment is reduced, and the preparation efficiency of the anhydrous sodium sulphate is improved.

Description

Technical Field

[0001] The present application relates to the technical field of chemical product production, and in particular to an evaporation crystallization device. Background Art

[0002] Sodium chlorite is a highly efficient oxidant with a wide range of uses, mainly in cotton spinning, flax, pulp bleaching, food disinfection, water treatment, sterilization and algae removal, and fish medicine manufacturing. Sodium chlorite products are available in two forms: solid and liquid, but liquid is used in many application fields, mainly because solid products are more dangerous and liquid products are less dangerous.

[0003] In the production of existing sodium chlorite, chlorine dioxide gas is generally prepared first, and then sodium chlorite is produced using chlorine dioxide gas. At present, some enterprises use the hydrogen peroxide method to produce sodium chlorite; roughly, sodium chlorate is melted with water and added to the chlorine dioxide generator; then a mixed gas of sulfur dioxide and air is passed into the generator. In the presence of sulfuric acid, sulfur dioxide and sodium chlorate undergo a reduction reaction. After the generated chlorine dioxide is diluted to an explosion-proof level (10%), it is sent to an absorption tower filled with hydrogen peroxide and alkali solution to produce sodium chlorite. After the reaction liquid is precipitated, its clear liquid is the sodium chlorite liquid product. If a fixed product is to be made, an evaporation crystallization and drying process is required. The solution in the generator is called "sodium sesquisulfate". Under normal circumstances, a large amount of mirabilite will be produced in the generator as the reaction proceeds.

[0004] The sodium chlorate, sulfuric acid and by-product Glauber's salt in this production method cannot be effectively utilized. The Chinese patent document with application number 201920578648.5 provides a solution to this problem. In step 1 of the solution, the raw materials sulfuric acid and sodium chlorate are respectively put into the evaporation crystallizer through the sulfuric acid tube and the sodium chlorate tube, and then heated in the evaporation crystallizer, so that the two raw materials undergo a double decomposition reaction in the evaporation crystallizer. By utilizing the low solubility of Glauber's salt, heating and concentration are performed to precipitate Glauber's salt crystals, and at the same time, excess water in the raw materials is evaporated; then, a feed pump is used to pump the raw material solution containing crystals at the bottom of the evaporation crystallizer to a filter device for filtration, and the filtered filter cake enters a drying device for drying to form glauber's salt (high-purity, fine-grained anhydrous sodium sulfate is called glauber's salt), and the filtrate is returned to the evaporation crystallizer for recycling.

[0005] However, the proportion of liquid in the raw material solution containing Glauber's salt crystals at the bottom of the evaporator crystallizer is still relatively high. If it is directly pumped to the filtration device through the feed pump, the filtration device will need to spend a lot of time to separate the Glauber's salt crystals and other liquids in the raw material solution, which will increase the workload of the filtration device and reduce the preparation efficiency of alum. Utility Model Content

[0006] The present application provides an evaporation crystallization device, which can perform secondary separation on a raw material solution containing Glauber's salt crystals at the bottom of an evaporation crystallizer before being pumped to a filtering device by a feed pump, thereby reducing the proportion of liquid in the solution containing Glauber's salt crystals, thereby reducing the time it takes for the filtering device to separate the Glauber's salt crystals from other liquids, and improving the preparation efficiency of alum.

[0007] The above-mentioned purpose of the present application is achieved through the following technical solutions:

[0008] An evaporation crystallization device comprises a crystallization reaction barrel, one side of which is provided with a heating assembly for heating; the bottom of the crystallization reaction barrel is connected to a secondary separation bin through a throat pipe, and the lower side of the secondary separation bin is connected to a filtering device through a first discharge pipe;

[0009] A filter plate is provided above one side of the secondary separation bin, the upper side of the filter plate is fixedly connected to the inner side of the top of the secondary separation bin, the lower side of the filter plate is fixedly connected to one end of a horizontal baffle, and the other end of the horizontal baffle is fixedly connected to the inner wall of the secondary separation bin;

[0010] A reflux pipe is provided on one side of the secondary separation bin, one end of which passes through the side wall of the secondary separation bin and is connected to the space enclosed by the filter plate and the horizontal baffle above one side of the secondary separation bin; the other end of the reflux pipe is connected to the water inlet end of the lifting water pump, and the water outlet end of the lifting water pump is connected to the internal space of the crystallization reaction barrel through the second discharge pipe;

[0011] The throat pipe and the first discharge pipe are both equipped with solenoid valves.

[0012] Furthermore, a stirring shaft is provided inside the crystallization reaction barrel body, and stirring blades are welded on the circumferential side of the stirring shaft. The upper end of the stirring shaft passes through the top plate of the crystallization reaction barrel body and the two are rotatably connected. After the upper end of the stirring shaft passes through the top plate of the crystallization reaction barrel body, it is fixedly connected to the output shaft of the driving motor, and the driving motor is fixedly mounted on the top plate of the crystallization reaction barrel body through a motor mounting bracket.

[0013] Furthermore, the heating assembly includes a heating jacket mounted on the outside of the crystallization reaction barrel, and the heating jacket is connected to the heating barrel through a steam transmission pipe; when the heating barrel is working, the pure water filled inside it can be heated into water vapor, and the water vapor can enter the heating jacket through the steam transmission pipe to complete the heating of the crystallization reaction barrel.

[0014] Furthermore, a steam discharge port is provided on the top plate of the crystallization reaction barrel body, and the steam discharge port is connected to the input end of the steam-water separator through a third discharge pipe. The steam-water separator is installed on the top plate of the crystallization reaction barrel body through a vertical pole bracket; the drain port of the steam-water separator is connected to the internal space of the heating barrel through a fourth discharge pipe.

[0015] Furthermore, the exhaust port of the steam-water separator is connected to the heating jacket through a steam reflux pipe, and a heating sleeve is provided on the pipe body of the steam reflux pipe.

[0016] Furthermore, the position where the upper end of the filter plate is connected to the secondary separation bin is located at the edge of the top port of the secondary separation bin, and the lower end of the filter plate is inclined toward the axial direction of the secondary separation bin.

[0017] Furthermore, a plurality of connecting pipes communicating with the internal space of the crystallization reaction barrel are provided on the top plate of the crystallization reaction barrel.

[0018] In summary, the present application includes at least one of the following beneficial technical effects:

[0019] After sulfuric acid and sodium chlorate react to produce Glauber's salt crystals in the crystallization reaction barrel of the present application, the solenoid valve on the throat can be started, and the solution containing Glauber's salt crystals at the bottom of the crystallization reaction barrel will flow from the throat to the secondary separation chamber, and then the solenoid valve on the throat is closed, and the solution is drawn from the space separated by the filter plate and the partition in the crystallization reaction barrel through the lifting water pump and the reflux pipe. The solutions in this area are all solutions that have been processed by the filter plate and do not contain Glauber's salt crystals. The lifting water pump can discharge these solutions into the crystallization reaction barrel through the second discharge pipe for secondary heating reaction crystallization. The amount of liquid contained in the remaining solution in the secondary separation chamber except for the Glauber's salt crystals is significantly reduced. At this time, it is pumped to the filter device through the feed pump, which can effectively reduce the workload of the filter device to separate the Glauber's salt crystals, shorten the time to filter out the Glauber's salt crystals, and thus improve the preparation efficiency of Yuanming powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

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

[0022] Figure 2 It is a schematic diagram of the internal structure of the crystallization reaction barrel and the secondary separation bin of the present application;

[0023] Figure 3 It is a top view of the present application.

[0024] Figure numerals: 1. crystallization reaction barrel; 2. heating assembly; 201. heating jacket; 202. steam transmission pipe; 203. heating barrel; 3. throat; 4. secondary separation chamber; 5. first discharge pipe; 6. filter plate; 7. horizontal baffle; 8. reflux pipe; 9. lifting water pump; 10. second discharge pipe; 11. solenoid valve; 12. stirring shaft; 13. stirring blade; 14. driving motor; 15. motor mounting bracket; 16. steam discharge port; 17. third discharge pipe; 18. steam-water separator; 19. vertical pole bracket; 20. fourth discharge pipe; 21. steam reflux pipe; 22. heating sleeve; 23. connecting pipe. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the present application.

[0026] like Figure 1 and Figure 2 As shown, an evaporation crystallization device disclosed in the present application comprises a crystallization reaction barrel body 1, and a heating assembly 2 for heating is provided on one side of the crystallization reaction barrel body 1; the bottom of the crystallization reaction barrel body 1 is connected to the secondary separation bin 4 through a throat pipe 3, and the lower side of the secondary separation bin 4 is connected to the filtering device through a first discharge pipe 5; a filter plate 6 is provided above one side of the secondary separation bin 4, the upper side of the filter plate 6 is fixedly connected to the inner side of the top of the secondary separation bin 4, the lower side of the filter plate 6 is fixedly connected to one end of a horizontal baffle 7, and the other end of the horizontal baffle 7 is fixedly connected to the inner wall of the secondary separation bin 4; a reflux pipe 8 is provided on one side of the secondary separation bin 4, and one end of the reflux pipe 8 passes through the side wall of the secondary separation bin 4 and is connected to the space enclosed by the filter plate 6 and the horizontal baffle 7 above one side of the secondary separation bin 4; the other end of the reflux pipe 8 is connected to the water inlet end of the lifting water pump 9, and the water outlet end of the lifting water pump 9 is connected to the internal space of the crystallization reaction barrel body 1 through the second discharge pipe 10; and electromagnetic valves 11 are installed on both the throat pipe 3 and the first discharge pipe 5.

[0027] In the above embodiments, the crystallization reaction barrel 1 and part of the heating assembly 2 of the present application are installed in the designated area within the factory area through a fixed bracket. The aperture of the filter plate 6 in the secondary separation bin 4 is smaller than the diameter of the Glauber's salt crystals, so that when the solution containing Glauber's salt crystals passes through the filter plate 6, the Glauber's salt crystals will be blocked on the outside of the filter plate 6. The horizontal baffle 7 used to support the lower end of the filter plate 6 is at a certain distance from the bottom of the secondary separation bin 4, so that when the solution containing Glauber's salt crystals at the bottom of the crystallization reaction barrel 1 enters the secondary separation bin 4, the reflux pipe 8 can only draw part of the solution located at the upper part of the secondary separation bin 4 back to the crystallization reaction barrel 1, so as to avoid that when too much liquid in the secondary separation bin 4 is drawn away, the concentration of the solution containing Glauber's salt crystals is too high, the fluidity is reduced, and the feed pump is not used to transport it to the filtration device. The top of the secondary separation bin 4 of the present application can be provided with an air inlet, so that when the solution in the crystallization reaction barrel 1 flows to the secondary separation bin 4, the pressure in the secondary separation bin 4 will not differ too much from the ambient pressure.

[0028] When the evaporation crystallization device of the present application is in use, sulfuric acid and sodium chlorate can be first added into the crystallization reaction barrel 1, and then heated by the heating component 2, so that the sulfuric acid and sodium chlorate produce a double decomposition reaction in the crystallization reaction barrel 1, and the low solubility of the Glauber's salt is utilized to precipitate the Glauber's salt crystals, and the heated crystallization reaction barrel 1 can discharge part of the excess water in the raw material.

[0029] The thenardite crystals will move to the bottom of the crystallization reaction barrel 1 under the action of gravity, so that the content of thenardite crystals at the bottom of the crystallization reaction barrel 1 will be relatively large, but this area still has a large amount of raw material solution. At this time, the solenoid valve 11 on the throat 3 is started to connect the crystallization reaction barrel 1 with the space in the secondary separation bin 4, and the solution containing thenardite crystals at the bottom of the crystallization reaction barrel 1 will flow into the secondary separation bin 4 through the throat 3.

[0030] After the secondary separation chamber 4 is full, the solenoid valve 11 on the throat 3 is closed and the lifting water pump 9 is started. The lifting water pump 9 can suck the solution in the space surrounded by the filter plate 6, the horizontal baffle 7 and the earphone separation chamber through the reflux pipe 8. The solution in this area has been processed by the filter plate 6. Therefore, the Glauber's salt crystals smaller than the pore size on the filter plate 6 will not be sucked away by the lifting water pump 9. In this way, the lifting water pump 9 can further separate part of the raw material solution in the secondary separation chamber 4 except the Glauber's salt crystals through the reflux pipe 8, and return it to the crystallization reaction barrel 1 through the second discharge pipe 10 to continue evaporation and crystallization. When the liquid level in the secondary separation bin 4 is lower than the horizontal baffle 7, the reflux pipe 8 can no longer pump liquid. At this time, the lifting water pump 9 stops working, and the concentration of the remaining Glauber's salt crystals in the secondary separation bin 4 will increase. After opening the solenoid valve 11 on the first discharge pipe 5, the solution containing Glauber's salt crystals remaining in the secondary separation bin 4 can be pumped to the filtering device through the feed pump. Since the amount of liquid other than Glauber's salt crystals in the solution remaining in the secondary separation bin 4 of the present application is significantly reduced, when the filtering device separates the Glauber's salt crystals and the raw material solution outside thereof, the workload of the filtering device in separating the Glauber's salt crystals can be effectively reduced, and the time for filtering out the Glauber's salt crystals can be shortened, thereby improving the preparation efficiency of alum.

[0031] Furthermore, if Figure 1-Figure 3 As shown, a stirring shaft 12 is provided inside the crystallization reaction barrel body 1, and stirring blades 13 are welded on the circumferential side of the stirring shaft 12. The upper end of the stirring shaft 12 passes through the top plate of the crystallization reaction barrel body 1 and the two are rotatably connected. The upper end of the stirring shaft 12 passes through the top plate of the crystallization reaction barrel body 1 and is fixedly connected to the output shaft of the driving motor 14. The driving motor 14 is fixedly mounted on the top plate of the crystallization reaction barrel body 1 through a motor mounting bracket 15.

[0032] In the above embodiment, after sulfuric acid and sodium chlorate are added to the crystallization reaction barrel 1, the driving motor 14 of the present application can drive the stirring blade 13 to rotate in the crystallization reaction barrel 1 through the stirring shaft 12, thereby stirring the sulfuric acid and sodium chlorate, which can effectively improve the mixing effect of the two, thereby increasing the reaction rate of sulfuric acid and sodium chlorate.

[0033] Furthermore, if Figure 1-Figure 3 As shown, the heating assembly 2 includes a heating jacket 201 which is sleeved on the outside of the crystallization reaction barrel body 1, and the heating jacket 201 is connected to the heating barrel 203 through a steam transmission pipe 202; when the heating barrel 203 is working, the pure water filled therein can be heated into water vapor, and the water vapor can enter the heating jacket 201 through the steam transmission pipe 202 to complete the heating of the crystallization reaction barrel body 1.

[0034] In the above embodiments, a heating element is provided under the bottom plate of the heating barrel 203 of the present application or in the interlayer of the barrel wall, which can heat the pure water passed into the interior thereof into water vapor, and the water vapor can be introduced into the heating jacket 201 outside the crystallization reaction barrel body 1 through the steam transmission pipe 202, thereby uniformly heating the crystallization reaction barrel body 1, and providing suitable generation conditions for the precipitation of the mirabilite crystals in the crystallization reaction barrel body 1. A water vapor and cooling water discharge port is provided below the heating jacket 201, and the discharge port can be connected to a discharge pipe for discharging the used water vapor in the heating jacket 201 and the cooling water in the heating jacket 201. The principle of heating the crystallization reaction barrel body 1 by injecting water vapor into the heating jacket 201 in this embodiment is similar to the principle of heating the reactor in the prior art by injecting water vapor into its jacket, and will not be repeated here.

[0035] Furthermore, if Figure 2 and Figure 3 As shown, a steam discharge port 16 is provided on the top plate of the crystallization reaction barrel body 1, and the steam discharge port 16 is connected to the input end of the steam-water separator 18 through a third discharge pipe 17. The steam-water separator 18 is installed on the top plate of the crystallization reaction barrel body 1 through a vertical pole bracket 19; the drain port of the steam-water separator 18 is connected to the internal space of the heating barrel 203 through a fourth discharge pipe 20.

[0036] In the above embodiments, the steam discharge port 16 installed on the top plate of the crystallization reaction barrel body 1 can convert part of the excess water inside the crystallization reaction barrel body 1 into water vapor when the crystallization reaction barrel body 1 is heated. The water vapor can flow into the steam-water separator 18 from the steam discharge port 16. The steam-water separator 18 can further separate the gas part and the liquid part in the water vapor. After the separated water flow flows into the heating barrel 203 along the fourth discharge pipe 20, it can be heated by the heating barrel 203 again and converted into water vapor for heating the crystallization reaction barrel body 1, thereby effectively saving water resources.

[0037] Furthermore, if Figure 3 As shown, the exhaust port of the steam-water separator 18 is connected to the heating jacket 201 through the steam reflux pipe 21 , and a heating jacket 22 is sleeved on the body of the steam reflux pipe 21 .

[0038] In the above embodiment, the water vapor containing a small amount of liquid water separated by the steam-water separator 18 will be heated by the heating sleeve 22 on the steam return pipe 21 when it flows to the heating jacket 201 through the steam return pipe 21, thereby raising its temperature to meet the heating requirement of the evaporation crystallization barrel, so that the water vapor discharged by the steam-water separator 18 can be reused for heating the crystallization reaction barrel 1. In actual use, the connection point between the steam return pipe 21 and the heating jacket 201 and the connection point between the steam transmission pipe 202 and the heating jacket 201 can be respectively arranged on the opposite side of the heating jacket 201, so that the input point of the heat source on the heating jacket 201 can be increased, thereby improving the uniformity of the temperature rise of the heating jacket 201.

[0039] Furthermore, if Figure 1-Figure 3 As shown, the position where the upper end of the filter plate 6 is connected to the secondary separation chamber 4 is located at the edge of the top port of the secondary separation chamber 4, and the lower end of the filter plate 6 is inclined toward the axial direction of the secondary separation chamber 4.

[0040] In the above embodiments, the filter plate 6 of the present application is arranged in the secondary separation bin 4 in the above manner, and the filter plate 6 is inclined below the port connected to the throat 3 at the top of the secondary separation bin 4. In this way, when the crystallization reaction barrel 1 releases the solution containing Glauber's salt crystals at its bottom into the secondary separation bin 4, it can flush the surface of the filter screen, thereby flushing down some Glauber's salt crystals attached to the surface of the filter screen, which can ensure that the filter screen has a better filtering effect during subsequent use.

[0041] Furthermore, if Figure 1-Figure 3 As shown, a plurality of connecting pipes 23 communicating with the inner space of the crystallization reaction barrel 1 are arranged on the top plate.

[0042] In the above embodiment, the multiple connecting pipes 23 on the top plate of the crystallization reaction barrel 1 can be used to add different raw materials or secondary solutions into the crystallization reaction barrel 1, so that the evaporation crystallization device of the present application is more convenient to use. The specific shapes and diameters of the multiple connecting pipes 23 are not necessarily the same, and can be adaptively adjusted as needed in actual production.

[0043] The implementation principle of this embodiment is: before use, first check whether the functions of various parts of the equipment are normal, and then check the liquid level of pure water in the heating barrel 203. If everything is normal, it can be used. First, sulfuric acid and sodium chlorate are added into the crystallization reaction barrel 1 through the dedicated connecting pipe 23 on the top plate of the crystallization reaction barrel 1, and then the heating barrel 203 is started to use the water vapor generated by it to heat the crystallization reaction barrel 1, and at the same time, the driving motor 14 is started to drive the stirring blade 13 to stir the raw materials in the crystallization reaction barrel 1. After a certain amount of Glauber's salt crystals are precipitated in the crystallization reaction barrel 1, the stirring can be stopped, and the solenoid valve 11 on the throat 3 is opened to discharge the solution containing Glauber's salt crystals at the bottom of the crystallization reaction barrel 1 into the secondary separation bin 4 through the throat 3.

[0044] After the secondary separation bin 4 is full, the electromagnetic valve 11 on the throat pipe 3 is closed, and the lifting water pump 9 is started. The lifting water pump 9 can perform a suction operation on the solution in the space surrounded by the filter plate 6, the horizontal baffle 7 and the secondary separation bin 4 through the reflux pipe 8. The lifting water pump 9 can further separate part of the raw material solution except the mirabilite crystals in the secondary separation bin 4 through the reflux pipe 8, and return it to the crystallization reaction barrel 1 through the second discharge pipe 10 to continue evaporation and crystallization. In this way, the amount of liquid except the mirabilite crystals in the remaining solution in the secondary separation bin 4 is significantly reduced, and these solutions are sent to the filtering device. When the filtering device separates the mirabilite crystals and the raw material solution outside thereof, the workload of the filtering device to separate the mirabilite crystals can be effectively reduced, and the time to filter out the mirabilite crystals can be shortened, thereby improving the preparation efficiency of alum.

[0045] The water vapor generated during the use of the crystallization reaction barrel 1 can be separated by the steam-water separator 18, and the liquid water droplets separated from the water vapor can be discharged into the heating barrel 203 through the fourth discharge pipe 20 to be reused; the gas separated from the water vapor can be heated by the heating sleeve 22 on the steam reflux pipe 21, and then injected into the heating jacket 201 for reuse; thereby effectively improving the utilization rate of the water vapor discharged from the crystallization reaction barrel 1.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application, rather than to limit it. In addition to sodium chlorite, the evaporation crystallization equipment of the present application is also applicable to other chemical products that require filtering the solution at the bottom of the evaporation crystallization equipment during the production process. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that it is still possible to modify the technical solutions described in the aforementioned embodiments, or to replace some or all of the technical features therein by equivalents; and these modifications or replacements do not cause the essence of the corresponding technical solution to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An evaporation crystallization device, comprising a crystallization reaction barrel (1), characterized in that: A heating assembly (2) for heating is provided on one side of the crystallization reaction barrel (1); the bottom of the crystallization reaction barrel (1) is connected to a secondary separation bin (4) via a throat pipe (3); and the lower side of the secondary separation bin (4) is connected to a filtering device via a first discharge pipe (5); A filter plate (6) is provided above one side of the secondary separation bin (4), the upper side of the filter plate (6) is fixedly connected to the inner side of the top of the secondary separation bin (4), the lower side of the filter plate (6) is fixedly connected to one end of a horizontal baffle (7), and the other end of the horizontal baffle (7) is fixedly connected to the inner wall of the secondary separation bin (4); A reflux pipe (8) is provided on one side of the secondary separation bin (4), one end of the reflux pipe (8) passes through the side wall of the secondary separation bin (4) and is connected to the space enclosed by the filter plate (6) and the horizontal baffle (7) above one side of the secondary separation bin (4); the other end of the reflux pipe (8) is connected to the water inlet end of the lifting water pump (9), and the water outlet end of the lifting water pump (9) is connected to the internal space of the crystallization reaction barrel (1) through the second discharge pipe (10); The throat pipe (3) and the first discharge pipe (5) are both equipped with solenoid valves (11).

2. The evaporation crystallization device according to claim 1, characterized in that: A stirring shaft (12) is provided inside the crystallization reaction barrel (1), and stirring blades (13) are welded on the circumference of the stirring shaft (12). The upper end of the stirring shaft (12) passes through the top plate of the crystallization reaction barrel (1) and the two are rotatably connected. The upper end of the stirring shaft (12) passes through the top plate of the crystallization reaction barrel (1) and is fixedly connected to the output shaft of a driving motor (14). The driving motor (14) is fixedly mounted on the top plate of the crystallization reaction barrel (1) via a motor mounting frame (15).

3. The evaporation crystallization device according to claim 1, characterized in that: The heating assembly (2) comprises a heating jacket (201) sleeved on the outside of the crystallization reaction barrel (1); the heating jacket (201) is connected to a heating barrel (203) via a steam transmission pipe (202); when the heating barrel (203) is in operation, the pure water filled therein can be heated into water vapor, and the water vapor can enter the heating jacket (201) through the steam transmission pipe (202), thereby completing the heating of the crystallization reaction barrel (1).

4. The evaporation crystallization device according to claim 3, characterized in that: A steam discharge port (16) is provided on the top plate of the crystallization reaction barrel (1), and the steam discharge port (16) is connected to the input end of a steam-water separator (18) via a third discharge pipe (17), and the steam-water separator (18) is installed on the top plate of the crystallization reaction barrel (1) via a vertical rod bracket (19); the water discharge port of the steam-water separator (18) is connected to the internal space of the heating barrel (203) via a fourth discharge pipe (20).

5. The evaporation crystallization device according to claim 4, characterized in that: The exhaust port of the steam-water separator (18) is connected to the heating jacket (201) via a steam reflux pipe (21), and a heating sleeve (22) is sleeved on the body of the steam reflux pipe (21).

6. The evaporation crystallization device according to any one of claims 1 to 5, characterized in that: The position where the upper end of the filter plate (6) is connected to the secondary separation bin (4) is located at the edge of the top port of the secondary separation bin (4), and the lower end of the filter plate (6) is inclined toward the axial direction of the secondary separation bin (4).

7. The evaporation crystallization device according to claim 6, characterized in that: A plurality of connecting pipes (23) communicating with the internal space of the crystallization reaction barrel (1) are provided on the top plate.

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