An evaporation crystallization device for separating sodium sulfate and lithium sulfate

Abstract

The present invention discloses an evaporation crystallization device for separating sodium sulfate from lithium sulfate, which relates to the field of lithium battery recovery, including an evaporator, a heat extractor and a centrifugal separator, wherein a distributor and a jacketed pipe are installed inside the evaporator, the evaporator is connected to an external heat source, the heat extractor is located below the evaporator, and a steam exhaust pipe is provided on the side of the heat extractor, the outer wall of the steam exhaust pipe is fixedly connected to a heater, the bottom end of the heat extractor is connected to an eccentrically arranged liquid collecting pipe, a sealing plate and a base are installed inside the centrifugal separator, and a driving mechanism is installed inside the sealing plate. A limiting column matching the connecting plate is provided on the driving disk of the present invention, which can drive the connecting plate to rotate through the limiting column during the movement of the filter box, thereby driving the filter box to rotate, facilitating the centrifugal drying of the filter box and the scraping treatment with the crystallization collection tube, thereby improving the processing effect.

Description

Technical Field

[0001] The invention relates to the field of lithium battery recovery, and in particular to an evaporation crystallization device for separating sodium sulfate from lithium sulfate. Background Art

[0002] Lithium battery recycling refers to the process of recycling and reusing used lithium batteries. With the widespread use of lithium batteries in various electronic devices, energy storage systems and electric vehicles, the problem of battery waste is becoming increasingly serious. Recycling lithium batteries not only helps reduce environmental pollution, but also helps to reuse resources. In the process of recycling lithium batteries, the battery structure will be dissolved by acidic substances, and then the dissolved solution will be purified and crystallized through evaporation equipment, etc. First, the solution is purified, heated and evaporated after purification, and the solution is concentrated. Crystals gradually form inside the concentrated solution, and then the crystals and solution are separated by filtering and separation equipment. After separation, the crystals will be preliminarily dried by centrifugal separation, and then uniformly recovered for precision processing.

[0003] Prior art, such as Chinese patent number CN216497909U, discloses a centrifugal dehydration device for producing copper sulfate crystals, which includes a base, a dehydration box is arranged on the top of the base, a sealed box cover is detachably connected to the top of the dehydration box, a feed port is conductively connected to the top of the sealed box cover, and a drain pipe is conductively connected to the bottom of the dehydration box; a mounting frame is arranged at the bottom of the dehydration box, a rotating table is rotatably connected to the top of the mounting frame, and a rotating drive mechanism for driving the rotating table to rotate is arranged between the rotating table and the mounting frame.

[0004] The filtration method in the prior art injects the concentrated liquid from the top into the dehydration equipment for dehydration, and the filtered crystals are stored in the filter box. However, when taking out the dried crystals, the equipment needs to be opened to take out the accumulated crystals. The operation process is very inconvenient and inconvenient for connection processing. Secondly, during the drying process, the centrifugal force will also make the crystals fit tightly to the inner wall of the filter box. After drying, the crystals will fit tightly to the inner wall of the filter box, and the hardness is relatively large, which is inconvenient to take out. Summary of the invention

[0005] Based on this, the purpose of the present invention is to provide an evaporation crystallization device for separating sodium sulfate and lithium sulfate to solve the technical problem.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: an evaporation crystallization device for separating sodium sulfate and lithium sulfate, comprising an evaporator, a heat remover and a centrifugal separator, wherein a distributor and a jacketed pipe are installed inside the evaporator, the evaporator is connected to an external heat source, the heat remover is located below the evaporator, and a steam exhaust pipe is provided on the side of the heat remover, a heater is fixedly connected to the outer wall of the steam exhaust pipe, an eccentrically arranged liquid collecting pipe is connected to the bottom end of the heat remover, a sealing plate and a base are installed inside the centrifugal separator, a driving mechanism is installed inside the sealing plate, a turntable is connected above the sealing plate, four groups of filter boxes are installed inside the turntable, a negative pressure centrifugal pump is installed on the side of the centrifugal separator, and the negative pressure centrifugal pump extends to the top of the turntable through a pipeline to dry and recover the crystals inside the filter box, a connecting frame is installed inside the centrifugal separator, the connecting frame drives the pipeline to be connected to the filter box, a collecting tank is installed at the bottom end of the connecting pipeline of the negative pressure centrifugal pump, and the collecting tank recovers the dried crystals.

[0007] By adopting the above technical solution, the stock solution can be conveniently concentrated, and the concentrated stock solution can be filtered by a centrifugal separator. After filtering, the crystals can be recovered by a negative pressure centrifugal pump.

[0008] The present invention is further configured such that the top end of the evaporator is connected to a top shell, a feed pipe is installed at the top end of the top shell, the feed pipe extends to the interior of the evaporator and is connected to a distributor, a plurality of groups of heat exchange tubes are installed inside the jacket tube, a heating tube is opened on the outside of the evaporator, and the heating tube is connected to the heat exchange tube.

[0009] As a preferred embodiment, the incoming stock solution can be fully heated to increase the heating area of ​​the stock solution and facilitate evaporation of the stock solution.

[0010] The present invention is further configured such that a curved guide plate is installed at the bottom end of the heat exhauster, and the curved guide plate is connected to the liquid collecting pipe, and the steam exhaust pipe is located on the side of the heat exhauster and is connected in two groups.

[0011] As a preferred embodiment, it is convenient to guide the concentrated raw liquid and discharge the steam.

[0012] The present invention is further configured such that a reflux pipe is connected to the side of the centrifuge, and the reflux pipe is connected to the bottom end inside the centrifuge; a sealing plate is installed above the turntable of the centrifuge, and the liquid collecting pipe is located above the sealing plate and passes through the sealing plate.

[0013] Preferably, the centrifugal separator can be sealed by a sealing plate to reduce the entry of steam.

[0014] The present invention is further configured such that an adjusting cylinder is installed at the top of the sealing plate, and the output end of the adjusting cylinder is transmission-connected to the connecting frame, the connecting frame is T-shaped, and the short rod of the connecting frame is symmetrically connected to two groups of crystallization collection tubes, and the first sleeve is sleeved on the outer side of the crystallization collection tube, and a through hole is opened on the top side of the crystallization collection tube, which is aligned with the pipeline inside the first sleeve, and an inclined opening and a scraper are opened at the bottom end of the crystallization collection tube, and the scraper is located on the inner side of the inclined opening, and when the connecting frame moves to the bottom, the through hole is connected to the first sleeve, and the end of the long rod of the connecting frame is connected to the second sleeve, and the bottom end of the second sleeve is connected to the nozzle.

[0015] Preferably, the crystallization collection tube and the second sleeve can be conveniently moved up and down, so that the crystallization collection tube and the second sleeve can be inserted into the collection tank when needed, and can be pulled out when not needed.

[0016] The present invention is further configured such that an air inlet is provided at the top of the heater, a flow guide pipe is connected to the bottom of the heater, and the flow guide pipe extends to the inside of the centrifugal separator, and the second sleeve is sleeved on the outside of the flow guide pipe.

[0017] Preferably, the heated air can be conveniently injected into the interior of the centrifugal separator and injected into the filter box through the second sleeve.

[0018] The present invention is further configured such that an air jet pipe and an air suction pipe are respectively connected to both sides of the negative pressure centrifugal pump, and the length of the air suction pipe is greater than the length of the air jet pipe, the bottom end of the air suction pipe is connected to the collecting tank, and the air jet pipe and the air suction pipe both extend to the interior of the centrifugal separator and are respectively connected to the two groups of first sleeves.

[0019] Preferably, the crystals in the filter box can be dried and discharged conveniently.

[0020] The present invention is further configured such that a limiting swivel is connected to the outer side of the filter box, and the filter box is rotatably connected to the turntable through the limiting swivel, and the turntable located on the outer side of each group of filter boxes is connected with a fixed collar, and a connecting plate is installed at the bottom end of the filter box, and the connecting plate is an arc plate with rounded ends, and multiple groups of drive disks are connected to the top end of the base, and each group of drive disks includes a limiting column and a driven shaft, the limiting column is composed of four groups of cylinders, and the spacing between the limiting columns matches the connecting plate, and the driven shaft is located on the inner side of the base.

[0021] As a preferred embodiment, the filter box is driven to rotate by a driving disk, so as to centrifugally dry the crystals.

[0022] The present invention is further configured such that the driving mechanism is divided into an upper motor and a lower motor, the output end of the upper motor is connected to the turntable, the output end of the lower motor is connected to a rotating gear plate, and the rotating gear plate is meshed with the outer wall of the driven shaft, and when the rotating gear plate rotates, it drives multiple groups of driven shafts to rotate synchronously.

[0023] As a preferred embodiment, it is convenient to drive multiple groups of centrifugal disks to rotate synchronously.

[0024] In summary, the present invention mainly has the following beneficial effects:

[0025] The present invention is provided with a rotating turntable and multiple groups of filter boxes. After the raw liquid is concentrated, the crystals in the raw liquid can be filtered through the multiple groups of filter boxes. After the crystals inside a group of filter boxes are saturated, the filter boxes are driven to rotate by the turntable, and other unsaturated filter boxes are moved to the bottom of the liquid collection pipe to continue filtering the raw liquid, and at the same time, the crystals inside the saturated filter boxes are processed and recovered.

[0026] The present invention, through the arranged turntable, negative pressure centrifugal pump and various groups of pipelines, can respectively air-dry and recover the crystals through the positive pressure and negative pressure of the centrifugal pump when processing the saturated filter box, and in the process of processing the crystals, the crystals attached to the inner wall of the filter box are crushed through the crystal collection tube, which is convenient for recovering the crystals, and at the same time, the contact area between the crystals and the air can be increased, thereby facilitating the air drying of the crystals and the subsequent heating and drying.

[0027] The present invention also provides a filter box and a drive disk, a curved connecting plate is provided at the bottom of the filter box, and a limiting column matching the connecting plate is provided on the driving disk. During the movement of the filter box, the connecting plate can be driven to rotate by the limiting column, thereby driving the filter box to rotate, making it convenient for the filter box to be centrifuged and dried and for scraping with the crystal collection tube, thereby improving the processing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the present invention;

[0029] Figure 2 Schematic diagram of the internal structure of the evaporator of the present invention;

[0030] Figure 3 It is a structural schematic diagram of the cross section of the heat rejector of the present invention;

[0031] Figure 4 It is a structural schematic diagram of the collecting mechanism of the present invention;

[0032] Figure 5 This is a schematic diagram of the structure of the collection and cleaning pipeline of the present invention;

[0033] Figure 6It is a structural schematic diagram of the connection between the rotating disk and the filter box of the present invention;

[0034] Figure 7 It is a structural schematic diagram of the installation of the rotating gear disc of the present invention;

[0035] Figure 8 It is a structural schematic diagram of the crystal collection tube of the present invention;

[0036] Fig. 9 It is a structural schematic diagram of the connection between the flow guide tube and the second sleeve of the present invention.

[0037] Description of reference numerals:

[0038] 1. Evaporator; 101. Top shell; 102. Feed pipe; 103. Heating pipe; 104. Distributor; 105. Jacket pipe; 106. Heat exchange pipe; 2. Heat extractor; 201. Steam discharge pipe; 202. Curved guide plate; 203. Liquid collecting pipe; 3. Heater; 301. Air inlet; 302. Guide pipe; 4. Centrifugal separator; 401. Reflux pipe; 402. Sealing plate; 403. Base; 4031. Support cylinder; 4032. Driving mechanism; 5. Negative pressure centrifugal pump; 501 , jet pipe; 502, suction pipe; 6, collection tank; 7, connecting frame; 701, crystal collection tube; 7011, through hole; 7012, oblique opening; 7013, scraper; 702, first sleeve; 703, second sleeve; 704, jet head; 8, turntable; 801, fixing ring; 802, strengthening beam; 9, filter box; 901, limiting swivel; 902, connecting plate; 10, driving disk; 1001, limiting column; 1002, driven shaft; 11, adjusting cylinder; 12, rotating gear disk. DETAILED DESCRIPTION

[0039] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0040] The following describes an embodiment of the present invention based on its overall structure.

[0041] See also Figure 1 to Figure 2An evaporation crystallization device for separating sodium sulfate from lithium sulfate comprises an evaporator 1, a heat exhauster 2 and a centrifugal separator 4. A distributor 104 and a jacket tube 105 are installed inside the evaporator 1. A top shell 101 is connected to the top of the evaporator 1. A feed pipe 102 is installed on the top of the top shell 101. The feed pipe 102 extends to the inside of the evaporator 1 and is connected to the distributor 104. Multiple groups of heat exchange tubes 106 are installed inside the jacket tube 105. A heating tube 103 is provided on the outside of the evaporator 1. The heating tube 103 is connected to the heat exchange tube 106 to facilitate evaporation and concentration of the stock solution, thereby forming crystals.

[0042] See also Figure 1 to Figure 2 The heat extractor 2 is located below the evaporator 1, and a steam exhaust pipe 201 is provided on the side of the heat extractor 2. The outer wall of the steam exhaust pipe 201 is fixedly connected to the heater 3. An air inlet 301 is provided on the top of the heater 3. The bottom end of the heater 3 is connected to a guide pipe 302. The bottom end of the heat extractor 2 is connected to an eccentrically arranged liquid collecting pipe 203. A reflux pipe 401 is connected to the side of the centrifugal separator 4, and the reflux pipe 401 is connected to the bottom end of the centrifugal separator 4, so as to facilitate the recovery and discharge of the evaporated solution.

[0043] See also Figures 3 to 7A sealing plate 402 and a base 403 are installed inside the centrifugal separator 4, a support tube 4031 is arranged inside the sealing plate 402, a driving mechanism 4032 is installed inside the supporting tube 4031, and the driving mechanism 4032 is divided into an upper motor and a lower motor. A turntable 8 is connected above the sealing plate 402, and a plurality of reinforcing beams 802 are installed on the inner wall of the turntable to improve the strength of the turntable 8. Four groups of filter boxes 9 are installed inside the turntable 8, and a negative pressure centrifugal pump 5 is installed below the sealing plate 402. The side of the centrifugal separator 4 is installed, and the negative pressure centrifugal pump 5 extends to the top of the turntable 8 through a pipeline to dry and recover the crystals inside the filter box 9. The negative pressure centrifugal pump 5 can discharge airflow to dry the crystals in a group of filter boxes 9. The output end of the upper motor is connected to the turntable 8, so as to drive the turntable 8 to rotate and move the filter box 9 to each group of crystal collection pipes 701 and nozzles 70 4, the output end of the lower motor is connected with a rotating toothed disk 12, and the rotating toothed disk 12 is meshed with the outer wall of the driven shaft 1002, the outer side of the filter box 9 is connected with a limited swivel 901, the filter box 9 is rotatably connected with the turntable 8 through the limited swivel 901, the turntable 8 is located on the outer side of each group of filter boxes 9 and is connected with a fixed collar 801, the bottom end of the filter box 9 is installed with a connecting plate 902, the connecting plate 902 is an arc plate with a rounded end, the top of the base 403 is connected with multiple groups of driving disks 10, and each group of driving disks 10 includes a limiting column 1001 and a driven shaft 1002, the limiting column 1001 is composed of four groups of cylinders, and the spacing between the limiting columns 1001 matches the connecting plate 902, the driven shaft 1002 is located on the inner side of the base 403, and when the rotating toothed disk 12 rotates, it drives the multiple groups of driven shafts 1002 to rotate synchronously, which can conveniently drive the filter box 9 to rotate, thereby drying the filter box 9.

[0044] See also Figures 4 to 9, an adjusting cylinder 11 is installed at the top of the sealing plate 402, and the output end of the adjusting cylinder 11 is transmission-connected to the connecting frame 7, the connecting frame 7 is T-shaped, the short rod of the connecting frame 7 is symmetrically connected with two groups of crystallization collection tubes 701, and the outer side of the crystallization collection tube 701 is sleeved with a first sleeve 702, a through hole 7011 is provided on the top side of the crystallization collection tube 701, which is aligned with the pipeline inside the first sleeve 702, an oblique opening 7012 and a scraper 7013 are provided at the bottom end of the crystallization collection tube 701, and the scraper 7013 is located on the inner side of the oblique opening 7012, and the scraper 7013 is located on the inner side of the oblique opening 7012, when the connecting frame 7 moves to the bottom, the through hole 7011 is connected with the first sleeve 702, and the end of the long rod of the connecting frame 7 is connected to the second sleeve 703, and the second sleeve The bottom end of the cylinder 703 is connected with a jet head 704, and the two sides of the negative pressure centrifugal pump 5 are respectively connected with an air jet pipe 501 and an air suction pipe 502, and the length of the air suction pipe 502 is greater than that of the air jet pipe 501, and the bottom end of the air suction pipe 502 is connected with the collecting tank 6, and the air jet pipe 501 and the air suction pipe 502 both extend to the inside of the centrifuge 4, and are respectively connected to the two groups of first sleeves 702, and the collecting tank 6 recovers the dried crystals, and the guide pipe 302 extends to the inside of the centrifuge 4, and the second sleeve 703 is sleeved on the outside of the guide pipe 302, which can facilitate drying and recovery, and when the grabbing plate rotates, the connecting frame 7 is driven to move upward by adjusting the cylinder 11 to avoid interference of the equipment with the rotation of the turntable 8.

[0045] In the above embodiments, please refer to Figure 3 A curved guide plate 202 is installed at the bottom end of the heat rejector 2, and the curved guide plate 202 is connected to the liquid collecting pipe 203, which can guide the concentrated raw liquid. The steam exhaust pipe 201 is located on the side of the heat rejector 2 and is connected with two groups, and the steam is discharged through the steam exhaust pipe 201.

[0046] During use, the stock solution is first injected into the evaporator 1 through the feed pipe 102, and the solution enters the distributor 104 and is evenly diverted to the pipe in the jacket pipe 105. Then, a heated airflow is injected into the evaporator 1 through the heating pipe 103, and the airflow heats the pipe in the jacket pipe 105, thereby heating the stock solution. The heated solution passes through the jacket pipe 105 and enters the heat exhauster 2. At this time, the water in the stock solution evaporates to form steam and is discharged through the steam discharge pipe 201. The concentrated stock solution falls on the curved guide plate 202 and is injected into the centrifugal separator 4 through the liquid collecting pipe 203. At this time, a group of filter boxes 9 are located below the liquid collecting pipe 203. The crystals in the concentrated stock solution are filtered through the filter box 9, and the filtered stock solution flows downward and enters the bottom end of the centrifugal separator 4. The screened stock solution is refluxed through the reflux pipe 401 and evaporated again.

[0047] When a group of filter boxes 9 is filled with a sufficient amount of crystals, the upper motor of the driving mechanism 4032 is started, and the upper motor drives the turntable 8 to rotate. The turntable 8 rotates and moves the filter box 9 with crystals to the bottom of the crystal collection tube 701 connected to the air jet 501. Then the turntable 8 is stopped. At this time, the new filter box 9 moves to the bottom of the liquid collection tube 203, so that the crystals in the concentrated raw liquid can be continuously filtered, thereby improving the filtering effect. During filtering, the adjustment cylinder 11 is first started to drive the connecting frame 7 to move downward, and drive the two groups of crystal collection tubes 701 and the second sleeve 703 to move downward. The crystal collection tube 701 of the air jet 501 is in contact with the inner wall of the filter box 9 with crystals. At the same time, the lower motor of the driving mechanism 4032 is started, and the lower motor drives the rotating toothed disc 12 to rotate, and the rotating toothed disc 12 drives the multiple groups of driving discs 10 to rotate, and the four groups of driving discs 10 drive the four groups of filter boxes 9 to rotate synchronously through the limiting pillars 1001 at the top to perform centrifugal drying, and the crystal collection tube 701 located below the air jet pipe 501 is inserted into the filter box 9 to perform the first scraping of the attached crystals. At the same time, the negative pressure centrifugal pump 5 is started, and the negative pressure centrifugal pump 5 sends air into the air jet pipe 501. The airflow in the air jet pipe 501 enters the filter box 9 that is being scraped for the first time, and the scraped crystals are preliminarily dried and the moisture is blown out, thereby improving the drying effect and facilitating the separation of the crystals from the inside of the filter box 9;

[0048] When the first scraping is completed, the adjustment cylinder 11 is started to move upward, driving the connecting frame 7 to move upward, moving the crystal collection tube 701 connected to the jet pipe 501 to the filter box 9 for the first scraping and removing it, and stopping the rotation of the lower motor, and then starting the upper motor again to drive the turntable 8 to rotate, and the turntable 8 drives the filter box 9 for the first scraping to move to the bottom of the second sleeve 703 and then stops. At this time, the filter box 9 is engaged with another set of driving disks 10, and the adjustment cylinder 11 drives the connecting frame 7 to move downward, and the connecting frame 7 drives the second sleeve 703 to move into the scraped filter box 9. At this time, the heater 3 is started, and the heater 3 inhales the outside air through the air inlet 301 and sends it into the second sleeve 703 through the guide pipe 302 at the bottom. The hot air is evenly sprayed into the scraped filter box 9 through the jet head 704 to heat the crystal, thereby performing a second drying to form dry crystals. At the same time, the lower motor drives the driving disk 10 to rotate, so that the filter box 9 also rotates, and the crystals are evenly heated and centrifugally dried.

[0049] After heating is completed, the adjustment cylinder 11 is started to drive the second sleeve 703 to be drawn out from the dry filter box 9, and then the lower motor is turned off, and the upper motor is started to drive the turntable 8 to rotate, so that the dry filter box 9 is moved to the bottom of the crystallization collection tube 701 connected to the suction pipe 502, and the adjustment cylinder 11 is started to insert the crystallization collection tube 701 connected to the suction pipe 502 into the dry filter box 9. At this time, the lower motor is started again to drive the driving disk 10 to rotate, and the driving disk 10 drives the dry filter box 9 to rotate. At this time, the negative pressure centrifugal pump 5 is started to pump the suction pipe 502 into negative pressure, and the crystallization collection tube 701 connected to the suction pipe 502 adsorbs the dry crystals and sucks the crystals into the suction pipe 502. When the suction pipe 502 reaches the connection position with the negative pressure centrifugal pump 5, the crystals are intercepted by the shielding structure (structures such as filter screens, which are prior art and will not be repeated again), so that the crystals fall under the action of gravity and enter the collecting tank 6, thereby collecting the crystals.

[0050] When the crystals are recovered, the crystal collection tube 701 is pulled out, and the upper motor drives the turntable 8 to rotate, and the recovered filter box 9 is moved to the bottom of the liquid collection tube 203 for the second cycle of collection.

[0051] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiments without creative contributions as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. An evaporation crystallization device for separating sodium sulfate and lithium sulfate, comprising an evaporator, a heat remover and a centrifugal separator, characterized in that: A distributor and a jacketed pipe are installed inside the evaporator, the evaporator is connected to an external heat source, the heat extractor is located below the evaporator, and a steam exhaust pipe is opened on the side of the heat extractor, the outer wall of the steam exhaust pipe is fixedly connected to a heater, and the bottom end of the heat extractor is connected to an eccentrically arranged liquid collecting pipe, a sealing plate and a base are installed inside the centrifugal separator, a driving mechanism is installed inside the sealing plate, a turntable is connected above the sealing plate, four groups of filter boxes are installed inside the turntable, a negative pressure centrifugal pump is installed on the side of the centrifugal separator, and the negative pressure centrifugal pump extends to the top of the turntable through a pipeline to dry and recover the crystals inside the filter box, a connecting frame is installed inside the centrifugal separator, the connecting frame drives the pipeline to be connected to the filter box, and a collecting tank is installed at the bottom end of the connecting pipeline of the negative pressure centrifugal pump, and the collecting tank recovers the dried crystals; The short rod of the connecting frame is symmetrically connected with two groups of crystallization collection tubes, and the outer side of the crystallization collection tube is sleeved with a first sleeve, the top side of the crystallization collection tube is provided with a through hole, which is aligned with the pipeline inside the first sleeve, and the bottom end of the crystallization collection tube is provided with an oblique opening and a scraper, and the scraper is located inside the oblique opening. When the connecting frame moves to the bottom, the through hole is connected with the first sleeve, and the end of the long rod of the connecting frame is connected with the second sleeve, and the bottom end of the second sleeve is connected with a nozzle; The top of the heater is provided with an air inlet, the bottom of the heater is connected with a guide pipe, and the guide pipe extends to the inside of the centrifugal separator, and the second sleeve is sleeved on the outside of the guide pipe; The negative pressure centrifugal pump is connected to both sides with an air jet pipe and an air suction pipe, and the length of the air suction pipe is greater than that of the air jet pipe. The bottom end of the air suction pipe is connected to the collecting tank. Both the air jet pipe and the air suction pipe extend to the inside of the centrifugal separator and are connected to the two sets of first sleeves respectively.

2. The evaporation crystallization device for separating sodium sulfate and lithium sulfate according to claim 1, characterized in that: The top of the evaporator is connected to a top shell, a feed pipe is installed on the top of the top shell, the feed pipe extends to the inside of the evaporator and is connected to the distributor, multiple groups of heat exchange tubes are installed inside the jacket tube, a heating tube is opened on the outside of the evaporator, and the heating tube is connected to the heat exchange tube.

3. The evaporation crystallization device for separating sodium sulfate and lithium sulfate according to claim 1, characterized in that: A curved guide plate is installed at the bottom end of the heat exhauster, and the curved guide plate is connected to the liquid collecting pipe. Two groups of steam exhaust pipes are located on the side of the heat exhauster and are connected.

4. The evaporation crystallization device for separating sodium sulfate and lithium sulfate according to claim 1, characterized in that: A reflux pipe is connected to the side of the centrifugal separator, and the reflux pipe is connected to the bottom end inside the centrifugal separator. A sealing plate is installed above the turntable of the centrifugal separator, and the liquid collection pipe is located above the sealing plate and penetrates the sealing plate.

5. The evaporation crystallization device for separating sodium sulfate and lithium sulfate according to claim 4, characterized in that: An adjusting cylinder is installed on the top of the sealing plate, and the output end of the adjusting cylinder is transmission-connected with a connecting frame, and the connecting frame is T-shaped.

6. The evaporation crystallization device for separating sodium sulfate and lithium sulfate according to claim 1, characterized in that: The outside of the filter box is connected to a limit swivel, and the filter box is rotatably connected to the turntable through the limit swivel. The turntable is located on the outside of each group of filter boxes and is connected to a fixed ring. A connecting plate is installed at the bottom of the filter box. The connecting plate is an arc plate with rounded ends. Multiple groups of drive disks are connected to the top of the base, and each group of drive disks includes a limit column and a driven shaft. The limit column is composed of four groups of cylinders, and the spacing between the limit columns matches the connecting plate. The driven shaft is located on the inner side of the base.

7. The evaporation crystallization device for separating sodium sulfate and lithium sulfate according to claim 6, characterized in that: The driving mechanism is divided into an upper motor and a lower motor. The output end of the upper motor is connected to the turntable, and the output end of the lower motor is connected to a rotating gear plate. The rotating gear plate is meshed with the outer wall of the driven shaft. When the rotating gear plate rotates, multiple groups of driven shafts are driven to rotate synchronously.

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