A device and method for extracting lithium sulfate from salt lake brine

Abstract

The application discloses a device and method for extracting lithium sulfate from salt lake brine, and relates to the lithium sulfate production process field, comprising a treatment tank, the top of the treatment tank is provided with an upper cover for sealing, and the outside of the treatment tank is provided with a support frame for supporting, further comprising: a filter element for filtering the solvent, the filter element comprises a plurality of partition plates, the filter plate is cleaned through the upper scraping assembly and the ejection assembly in the cleaning mechanism, the filtered material is discharged into the inside of the collecting cylinder through the feed port, the filter plate is rotated into the cleaning mechanism, and in the cleaning process, the filtered material is prevented from penetrating through the filter plate due to scraping, the purity of the liquid after filtration is ensured, the filtration is not affected in the cleaning process, and the equipment does not need to be stopped for cleaning.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of lithium sulfate production process, in particular to a device and method for extracting lithium sulfate from salt lake brine. BACKGROUND

[0002] Lithium sulfate is widely used in many fields, such as for producing special high-strength glass, food and beverage flavoring agents, etc.

[0003] The present application discloses a device for extracting lithium carbonate from salt lake brine, which comprises a heating tank mechanism, a driving mechanism fixedly installed on the top of the heating tank mechanism, and a support column fixedly connected to the ground of the heating tank mechanism. The heating tank mechanism comprises a tank body shell and a top cover. The inside of the tank body shell is provided with a heating cavity and a stirring cavity. The heating oil in the heating cavity is heated, and the high-temperature oil liquid in the heating cavity is used to transfer heat to the brine in the stirring cavity. Then, the servo motor is started to rotate the stirring rod, so that the stirring rod drives the arc-shaped plate in the stirring rod through the connecting bearing to stir the brine received in the hemispherical liquid storage box. The hemispherical liquid storage box is used to collect the brine at the bottom of the device, and the stirring net is driven by the arc-shaped plate to fully stir and heat the brine. The heating effect of the device on the residual brine is effectively improved.

[0004] The above scheme is the process of brine evaporation and crystallization. When extracting lithium sulfate from brine, calcium oxide is added to the lithium-rich solution, the pH is adjusted to 10-13, and solid-liquid separation is performed to obtain filtrate and filter residue. However, during the filtration process, the filter residue may block the filter screen. When the filtration time is up, the device needs to be cleaned, which affects the work progress. If the filter residue on the filter screen is directly scraped, the filter residue may pass through the filter screen, affecting the filtered liquid, and the filter residue still exists on the filter screen, which needs to be removed by opening the device.

[0005] Therefore, it is necessary to provide a device and method for extracting lithium sulfate from salt lake brine to solve the above technical problems. SUMMARY

[0006] The present application aims to provide a device and method for extracting lithium sulfate from salt lake brine to solve the problems of the prior art as mentioned in the background.

[0007] Based on the above idea, the present application provides the following technical scheme: a device for extracting lithium sulfate from salt lake brine, comprising a treatment tank, an upper cover for sealing arranged on the top of the treatment tank, and a support frame for supporting arranged outside the treatment tank, further comprising:

[0008] The utility model provides a filter piece for filtering solvent, and the filter piece comprises a plurality of partition plates, a filter plate for filtering is fixedly connected between a plurality of adjacent partition plates, a mounting cylinder is fixedly connected to the top of the plurality of partition plates, a driving motor is fixedly connected inside a processing tank, and the output shaft of the driving motor is fixedly connected to the mounting cylinder;

[0009] A support round frame is fixedly connected to the inside of the processing tank, the support round frame is sleeved outside the filter piece and is in close contact with the outside of the plurality of partition plates, two cleaning mechanisms for cleaning the filter plate are arranged outside the support round frame, the cleaning mechanism comprises a scraping assembly for cleaning the upper part of the filter plate and an ejection assembly for ejecting the lower part of the filter plate;

[0010] A collection cylinder for discharging waste is arranged below the mounting cylinder and is rotatably connected with the plurality of partition plates, a feeding port is formed in the outside of the collection cylinder, and the filter material of the filter plate is discharged into the inside of the collection cylinder through the feeding port by the cleaning mechanism.

[0011] As a further scheme of the utility model, the scraping assembly comprises:

[0012] An upper fixed frame is fixedly connected to the top of the support round frame and is in close contact with the top of the partition plate, a first lead screw is rotatably connected inside the upper fixed frame;

[0013] A first moving plate is sleeved outside the first lead screw and is connected with the first lead screw through a ball nut pair, the first moving plate is slidably connected with the inner wall of the upper fixed frame;

[0014] A scraper is arranged inside the support round frame and is used for scraping the top of the filter plate, two second racks are fixedly connected to the top of the scraper;

[0015] Two support plates are fixedly connected to the bottom of the first moving plate, and a first rack is slidably connected to the outside of the support plate, the first rack is connected with the first moving plate through an elastic element, and the second rack is slidably connected to the outside of the support plate;

[0016] Two first gears are rotatably connected with the two support plates respectively, the first gear is meshedly connected with the second rack, the second rack is slidably connected with the support plate, and when the first rack is in contact with one end of the upper fixed frame, the second rack is moved towards the collection cylinder through the first gear.

[0017] As a further scheme of the utility model, the ejection assembly comprises:

[0018] A lower fixed frame is fixedly connected to the bottom of the support round frame and is arranged below the filter plate, and the lower fixed frame is in communication with the collection cylinder;

[0019] A second screw rod is rotatably connected to the interior of the lower fixed frame, and an outer side of the second screw rod is connected to a moving block through a ball nut pair, and the moving block is slidably connected to the bottom end of the interior of the lower fixed frame;

[0020] The brush plate is arranged on the top of the moving block, and a second telescopic rod and a second spring are fixedly connected between the brush plate and the moving block, and the second spring is sleeved on the outside of the second telescopic rod to pull the brush plate down;

[0021] Two corrugated plates, the two corrugated plates are respectively fixedly connected to two sides of the lower fixed frame;

[0022] There are two fixed plates, both of which are fixedly connected to the bottom of the brush plate, and the outer side of the fixed plate is rotatably connected with a rotating wheel, which slides on the top of the wave plate. When the rotating wheel slides on the wave plate, the brush plate is pushed up and down through the fixed plate to eject the filtered material on the filter plate.

[0023] As a further solution of the present invention: it also includes an air blowing component arranged on one side of the brush plate, and the air blowing component includes:

[0024] A fixed side plate, the fixed side plate is fixedly connected to one side of the brush plate;

[0025] The nozzle is fixedly connected to the top of the brush plate, and multiple nozzles are arranged on the outside of the nozzle;

[0026] Multiple fixed cylinders, the outer sides of the multiple fixed cylinders are fixedly connected to the outer side of the moving block, and the multiple fixed cylinders are provided with connecting rods inside, the connecting rods pass through the fixed cylinders and are slidably connected to the fixed cylinders, and the connecting rods are fixedly connected to the fixed side plates;

[0027] The airbag is arranged inside the fixed tube, and the two ends of the airbag are fixedly connected to the connecting rod and the top end of the fixed tube respectively. There is a connecting pipe between the airbag and the nozzle. When the connecting rod rises, the airbag is squeezed, and the gas inside the airbag is discharged into the nozzle through the connecting pipe and sprayed out. A one-way air inlet valve is provided on the outside of the airbag.

[0028] As a further solution of the present invention: a connecting cylinder is provided inside the treatment tank, the connecting cylinder is fixedly connected to the treatment tank through a support plate, and the outside of the connecting cylinder is fixedly connected to a liquid inlet pipe for water intake, the liquid inlet pipe extends to the outside of the treatment tank, and the bottom of the connecting cylinder is fixedly connected to multiple liquid spray branches, the multiple liquid spray branches are respectively arranged on the top of multiple filter plates, and a drain pipe for drainage is provided at the bottom of the treatment tank.

[0029] As a further solution of the present invention: the elastic member includes a connecting frame fixedly connected to one side of the first movable plate, and a first telescopic rod and a first spring are fixedly connected between the connecting frame and the first rack. The first spring is sleeved on the outside of the first telescopic rod to push the first rack to reset.

[0030] As a further scheme of the present application: the bottom of the collecting cylinder is fixedly connected with an extrusion frame, the bottom of the extrusion frame is fixedly connected with a discharge pipe, a control valve for controlling the opening of the pipe is arranged outside the discharge pipe, two liquid discharge grooves are arranged at the two ends of the bottom of the extrusion frame, two L-shaped extrusion plates are arranged inside the extrusion frame, the two L-shaped extrusion plates are oppositely arranged, and the L-shaped extrusion plates penetrate through one side of the extrusion frame and are slidably connected with the extrusion frame.

[0031] As a further scheme of the present application: the two L-shaped extrusion plates are fixedly connected with two third racks at one side, the third racks penetrate through the extrusion frame and are slidably connected with the extrusion frame, the two third racks are rotatably connected with a rotating rod at the top, the rotating rod is rotatably connected with a side plate at the two ends, the side plate is fixedly connected with the extrusion frame, and a torsional spring is arranged between the rotating rod and the side plate, and the two ends of the torsional spring are fixedly connected with the rotating rod and the side plate respectively.

[0032] As a further scheme of the present application: the rotating rod is fixedly connected with a winding disc outside, the winding disc is wound with a traction rope outside, the traction rope penetrates through the bottom of the lower fixed frame and is fixedly connected with a moving block, and the moving block moves to pull the winding disc to move through the traction rope.

[0033] A method for extracting lithium sulfate from salt lake brine, comprising the following steps:

[0034] Step one, add calcium oxide to the lithium-rich solution, adjust the pH to 10-13, and put it into the inside of the treatment tank;

[0035] Step two, filter the filter residue in the solvent through multiple filter plates, and in the filtering process, the two filter plates are continuously switched to the inside of the cleaning mechanism by starting the driving motor to drive the installation cylinder to rotate;

[0036] Step three, the filter plates are cleaned by the upper scraping assembly and the ejection assembly in the cleaning mechanism, and the filtered material is discharged into the inside of the collecting cylinder through the feed port;

[0037] Step four, the filtrate is cooled to precipitate sodium sulfate decahydrate crystals, and the filtrate and filter residue are obtained after filtration, and the filtered filtrate solvent is evaporated to obtain lithium sulfate.

[0038] Compared with the prior art, the present application has the following advantages:

[0039] 1. The filter plates are cleaned by the upper scraping assembly and the ejection assembly in the cleaning mechanism, and the filtered material is discharged into the inside of the collecting cylinder through the feed port, the filter plates are rotated to the cleaning mechanism, and in the cleaning process, the filtered material is prevented from passing through the filter plates due to scraping, ensuring the purity of the liquid after filtration, and the cleaning process does not affect the filtration, and the equipment does not need to be stopped for cleaning.

[0040] 2. During the rotation and switching of multiple filter plates, the scraper and the upper fixed frame will not push the filtered material on the upper part of the filter plate. In the process of the scraper pushing the filtered material on the top of the filter plate, when the first movable plate approaches one end of the first screw rod, the first rack contacts the end of the upper fixed frame, causing the first rack to move in the opposite direction of the first movable plate, so that the first rack drives the meshing first gear to rotate, and the first gear drives the meshing second rack to move, and the second rack drives the fixedly connected scraper, so that the scraper continues to move forward on the top of the filter plate, pushing the filtered material completely into the collection cylinder for cleaning, thereby ensuring that the filtered material on the filter plate is thoroughly cleaned.

[0041] 3. The moving block drives the brush plate to move through the second telescopic rod and the second spring, and the rotating wheel on the side of the fixed plate at the bottom of the brush plate rolls on the wave plate, so that the brush plate continuously rises and falls, so that the bristles set on the brush plate continuously lift the filter plate and cooperate with the scraper on the filter plate to push it, ensuring that the filter plate is fully cleaned and avoiding the situation where the filtered material is stuck inside the filter plate and cannot be cleaned.

[0042] 4. The third rack pushes the fixedly connected L-shaped extrusion plate to move, so that the two L-shaped extrusion plates are close to each other to squeeze the filtrate, squeeze out the mixed brine in the filtrate, and the liquid passes through the L-shaped extrusion plate. When the moving block is reset, the torsion spring drives the rotating rod to rotate in the opposite direction, and then the third rack pulls the L-shaped extrusion plate to move toward one end of the extrusion frame, and the squeezed liquid is discharged through the drainage trough, thereby ensuring full utilization of the liquid and avoiding waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The present invention will be further described below with reference to the accompanying drawings and examples.

[0044] Figure 1 This is a schematic diagram of the overall structure of the device for extracting lithium sulfate from salt lake brine of the present invention;

[0045] Figure 2 This is a schematic diagram of the cross-sectional structure of the processing tank of the present invention;

[0046] Figure 3 It is a schematic diagram of the supporting circular frame structure of the present invention;

[0047] Figure 4 This is a schematic diagram of the liquid spray branch pipe structure of the present invention;

[0048] Figure 5 This is a schematic diagram of the separation structure of the filter element and the supporting circular frame of the present invention;

[0049] Figure 6 It is a schematic diagram of the upper fixing frame structure of the present invention;

[0050] Figure 7Is the scraper structure schematic diagram of the application;

[0051] Figure 8 Is the scraping assembly structure schematic diagram of the application;

[0052] Figure 9 Is the ejection assembly structure schematic diagram of the application;

[0053] Figure 10 Is the air jet assembly structure schematic diagram of the application;

[0054] Figure 11 Is the extrusion frame structure schematic diagram of the application;

[0055] Figure 12 Is the L-shaped extrusion plate structure schematic diagram of the application.

[0056] In the figure: 1, treatment tank; 101, support frame; 102, upper cover; 104, liquid discharge pipe; 2, support round frame; 3, partition plate; 301, filter plate; 302, mounting cylinder; 401, connecting cylinder; 402, liquid inlet pipe; 403, liquid injection branch pipe; 5, collection cylinder; 501, feed inlet; 6, upper fixed frame; 601, first screw rod; 602, first moving plate; 603, support plate; 604, first gear; 605, first rack; 606, second rack; 607, scraper; 608, connecting frame; 609, first telescopic rod; 610, first spring; 7, lower fixed frame; 701, second screw rod; 702, moving block; 703, brush plate; 704, second telescopic rod; 705, second spring; 706, fixed plate; 707, rotating wheel; 708, wave plate; 709, fixed side plate; 710, air jet head; 713, fixed cylinder; 714, connecting rod; 715, air bag; 8, extrusion frame; 800, liquid discharge groove; 801, control valve; 802, L-shaped extrusion plate; 803, rotating rod; 804, second gear; 805, third rack; 806, winding disc; 808, side branch plate; 809, traction rope. DETAILED DESCRIPTION

[0057] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application.

[0058] In the description of the application, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "periphery" and the like indicate the orientation or positional relationship, and are only used to facilitate the description of the application and simplify the description, and do not indicate or imply that the indicated component or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the application.

[0059] As Figures 1 to 12As shown, a device and method for extracting lithium sulfate from salt lake brine, comprising the following embodiments:

[0060] Embodiment one: as shown in Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7 As shown, a device and method for extracting lithium sulfate from salt lake brine, comprising the following embodiments:

[0061] A filter for filtering the solvent, the filter comprising a plurality of partition plates 3, a plurality of adjacent partition plates 3 being fixedly connected with a filter plate 301 for filtering, the plurality of partition plates 3 being fixedly connected with a mounting cylinder 302 at the top, a driving motor being fixedly connected inside the treatment tank 1, and the output shaft of the driving motor being fixedly connected with the mounting cylinder 302;

[0062] A support round frame 2 fixedly connected inside the treatment tank 1, the support round frame 2 being sleeved outside the filter and being in close contact with the outside of the plurality of partition plates 3, two groups of cleaning mechanisms for cleaning the filter plate 301 being provided outside the support round frame 2, the cleaning mechanisms comprising a scraping assembly for cleaning the upper part of the filter plate 301 and a ejection assembly for ejecting the lower part of the filter plate 301;

[0063] A collection cylinder 5 for discharging waste, the collection cylinder 5 being provided below the mounting cylinder 302 and being rotatably connected with the plurality of partition plates 3, the collection cylinder 5 being provided with a feed port 501 outside, and the filter plate 301 being discharged into the inside of the collection cylinder 5 through the feed port 501 by the cleaning mechanism.

[0064] In specific implementation, calcium oxide is added to the lithium-rich solution, the pH is adjusted to 10-13, and the inside of the treatment tank 1 is put in, the filter residue in the solvent is filtered through the plurality of filter plates 301, in the filtering process, the mounting cylinder 302 is driven to rotate by starting the driving motor, two filter plates 301 are constantly switched to the inside of the cleaning mechanism, the filter plate 301 is cleaned by the upper scraping assembly and the ejection assembly in the cleaning mechanism, the filter material is discharged into the inside of the collection cylinder 5 through the feed port 501, the filter plate 301 is rotated to the cleaning mechanism, in the cleaning and filtering process, the filter material is prevented from passing through the filter plate 301 due to scraping of the filter material, the purity of the liquid after filtering is ensured, and the filtering is not affected in the cleaning process, and the equipment does not need to be stopped for cleaning.

[0065] In this embodiment, the processing tank 1 is internally provided with a connecting barrel 401, which is fixedly connected with the processing tank 1 through a support plate, and the outer side of the connecting barrel 401 is fixedly communicated with a liquid inlet pipe 402 for water inlet, which extends to the outer side of the processing tank 1. The bottom of the connecting barrel 401 is fixedly communicated with a plurality of liquid injection branch pipes 403, which are arranged on the top of the plurality of filter plates 301, and the bottom of the processing tank 1 is provided with a liquid outlet pipe 104 for water outlet.

[0066] In specific implementation, when the processing liquid enters the connecting barrel 401 through the liquid inlet pipe 402, it is discharged through the plurality of liquid injection branch pipes 403 at the bottom of the connecting barrel 401, which are aligned with the filter plates 301 between the plurality of partition plates 3, so as to ensure the sufficient filtration of the liquid by the filter plates 301.

[0067] Embodiment two: as shown in Figure 7 and Figure 8 The scraping assembly comprises:

[0068] The upper fixed frame 6 is fixedly connected to the top of the support circular frame 2 and is attached to the top of the partition plate 3. The first screw rod 601 is rotatably connected inside the upper fixed frame 6.

[0069] The first moving plate 602 is sleeved outside the first screw rod 601 and is connected with the first screw rod 601 through a ball nut pair. The first moving plate 602 is slidingly connected with the inner wall of the upper fixed frame 6.

[0070] The scraper 607 is arranged inside the support circular frame 2 and is used for scraping the top of the filter plate 301. The scraper 607 is fixedly connected with two second racks 606 at the top.

[0071] The two support plates 603 are fixedly connected to the bottom of the first moving plate 602. The support plates 603 are slidingly connected with the first rack 605 outside. The first rack 605 is connected between the first moving plate 602 and the support plate 603 through an elastic member. The second rack 606 is slidingly connected outside the support plate 603.

[0072] The two first gears 604 are rotatably connected with the two support plates 603, respectively. The first gear 604 is meshingly connected with the second rack 606. The second rack 606 is slidingly connected with the support plate 603. When the first rack 605 is in contact with one end of the upper fixed frame 6, the second rack 606 is moved to the collecting barrel 5 through the first gear 604.

[0073] The elastic member comprises a connecting frame 608 fixedly connected to one side of the first moving plate 602, a first telescopic rod 609 and a first spring 610 fixedly connected between the connecting frame 608 and the first rack 605, and the first spring 610 is sleeved outside the first telescopic rod 609 and used for pushing the first rack 605 to reset.

[0074] In specific implementation, when the driving motor drives the mounting cylinder 302 to rotate, the mounting cylinder 302 drives the plurality of partition plates 3 to rotate, when one of the filter plates 301 rotates to the bottom of the upper fixed frame 6, the upper fixed frame 6 covers above the filter plate 301, so that the treatment liquid does not flow in during the cleaning process, a micro motor is arranged inside the support circular frame 2, the micro motor drives the first lead screw 601 to rotate, the first lead screw 601 drives the first moving plate 602 to move, the first moving plate 602 drives the scraper 607 to move through the first rack 605, the support plate 603 and the second rack 606, the scraper 607 is driven from inside the support circular frame 2 to the top of the filter plate 301, and the filter material on the filter plate 301 is scraped, in the scheme, the scraper 607 is inside the support circular frame 2, during rotation and switching of the plurality of filter plates 301, the scraper 607 and the upper fixed frame 6 do not push the filter material on the top of the filter plate 301, during pushing of the filter material on the top of the filter plate 301 by the scraper 607, when the first moving plate 602 is close to one end of the first lead screw 601, the first rack 605 is in contact with the end of the upper fixed frame 6, the first rack 605 moves in the opposite direction of the first moving plate 602, the first rack 605 drives the meshing connected first gear 604 to rotate, the first gear 604 drives the meshing connected second rack 606 to move, the second rack 606 drives the fixedly connected scraper 607, so that the scraper 607 continues to move forward on the top of the filter plate 301, the filter material is completely pushed into the collecting cylinder 5 for cleaning, and complete cleaning of the filter material on the filter plate 301 is ensured.

[0075] Embodiment two: as shown in Figure 8 , Figure 9 and Figure 10 , the ejection assembly comprises:

[0076] a lower fixed frame 7 fixedly connected to the bottom of the support circular frame 2 and arranged below the filter plate 301, and the lower fixed frame 7 is in communication with the collecting cylinder 5;

[0077] a second lead screw 701 rotationally connected inside the lower fixed frame 7 and having a moving block 702 connected outside through a ball nut pair, and the moving block 702 is slidingly connected to the bottom end inside the lower fixed frame 7;

[0078] The brush plate 703 is arranged on the top of the moving block 702, and the second telescopic rod 704 and the second spring 705 are fixedly connected between the brush plate 703 and the moving block 702, and the second spring 705 is sleeved outside the second telescopic rod 704, for pulling the brush plate 703 to descend;

[0079] The two wave plates 708 are fixedly connected to the inner sides of the lower fixed frame 7 respectively;

[0080] The two fixed plates 706 are fixedly connected to the bottom of the brush plate 703, and the rotating wheel 707 is rotatably connected to the outside of the fixed plate 706, and the rotating wheel 707 slides on the top of the wave plate 708, when the rotating wheel 707 slides on the wave plate 708, the fixed plate 706 pushes the brush plate 703 to constantly ascend and descend, and the filtered material on the filter plate 301 is pushed out.

[0081] In specific implementation, when the filter plate 301 to be cleaned is rotated to the upper side of the lower fixed frame 7, the scraping assembly in the upper fixed frame 6 scrapes the filter plate 301, the lower fixed frame 7 receives the filtered material, so that the filtered material does not pass through the filter plate 301 and affect the filtered brine, and the ejection assembly is arranged on the top of the lower fixed frame 7, in the present scheme, the motor is arranged in the lower fixed frame 7, the output shaft of the motor drives the second lead screw 701 to rotate, the moving block 702 on the outside of the second lead screw 701 moves in the lower fixed frame 7, the moving block 702 drives the brush plate 703 to move through the second telescopic rod 704 and the second spring 705, and the rotating wheel 707 on one side of the fixed plate 706 at the bottom of the brush plate 703 rolls on the wave plate 708, so that the brush plate 703 constantly ascends and descends, the bristles arranged on the brush plate 703 constantly push the filter plate 301, and the scraping plate 607 on the filter plate 301 is pushed, so that the filter plate 301 is fully cleaned, and the filtered material is prevented from being stuck in the filter plate 301 and being unable to be cleaned.

[0082] In the present embodiment, as shown in Figure 10 The air blowing assembly is arranged on one side of the brush plate 703, and the air blowing assembly comprises:

[0083] The fixed side plate 709 is fixedly connected to one side of the brush plate 703;

[0084] The air blowing head 710 is fixedly connected to the top of the brush plate 703, and a plurality of nozzles are arranged on the outside of the air blowing head 710;

[0085] A plurality of fixed cylinders 713 are fixedly connected to the outer side of the moving block 702, and a connecting rod 714 is arranged in each of the fixed cylinders 713 and penetrates the fixed cylinder 713 and is in sliding connection with the fixed cylinder 713, and the connecting rod 714 is fixedly connected with the fixed side plate 709;

[0086] An air bag 715 is arranged in the fixed cylinder 713, and the air bag 715 is fixedly connected with the connecting rod 714 and the inner top end of the fixed cylinder 713 at both ends, and a communication pipe is fixedly connected between the air bag 715 and the air jet head 710, and when the connecting rod 714 rises, the air bag 715 is pressed to exhaust the gas in the air bag 715 to the air jet head 710 through the communication pipe, and the outer side of the air bag 715 is provided with a one-way air inlet valve.

[0087] In specific implementation, when the brush plate 703 drives the fixed side plate 709 to move, the connecting rod 714 compresses the air bag 715 at the top of the connecting rod 714 in the process of the brush plate 703 rising, and the gas in the air bag 715 is transported to the inside of the air jet head 710 through the communication pipe, and the filter plate 301 is jetted through the air jet head 710, thereby further improving the filtering effect, and when the fixed side plate 709 descends, the air bag 715 is pulled by the connecting rod 714 to inhale air, thereby preparing for the next inflation.

[0088] Embodiment three: as shown in Figure 11 and Figure 12 The bottom of the collecting cylinder 5 is fixedly connected with a squeezing frame 8, the bottom of the squeezing frame 8 is fixedly connected with a discharge pipe, the outer side of the discharge pipe is provided with a control valve 801 for controlling the opening of the pipe, the bottom of the squeezing frame 8 is provided with a liquid discharge groove 800 at both ends for discharging liquid, and the inside of the squeezing frame 8 is provided with two L-shaped squeezing plates 802, the two L-shaped squeezing plates 802 are oppositely arranged, and the L-shaped squeezing plates 802 penetrate one side of the squeezing frame 8 and are in sliding connection with the squeezing frame 8.

[0089] The two L-shaped squeezing plates 802 are fixedly connected with two third racks 805 at one side, the third racks 805 penetrate the squeezing frame 8 and are in sliding connection with the squeezing frame 8, the top of each of the two third racks 805 is engaged with a second gear 804, the two second gears 804 are fixedly connected with a rotating rod 803, the two ends of the rotating rod 803 are rotatably connected with side support plates 808, the side support plates 808 are fixedly connected with the squeezing frame 8, and a torsional spring is arranged between the rotating rod 803 and the side support plates 808, and the two ends of the torsional spring are fixedly connected with the rotating rod 803 and the side support plates 808, respectively.

[0090] The outer side of the rotating rod 803 is fixedly connected with a winding disc 806, the outer side of the winding disc 806 is wound with a traction rope 809, the traction rope 809 penetrates the bottom of the lower fixed frame 7 and is fixedly connected with the moving block 702, and the moving block 702 moves to pull the winding disc 806 to move through the traction rope 809.

[0091] In particular, when the scraped filter falls into the extrusion frame 8 through the collecting cylinder 5, the control valve 801 is in the closed state, and during the movement of the moving block 702, the winding disc 806 is rotated by the traction rope 809, the rotating rod 803 is rotated, the second gear 804 connected with the rotating rod 803 is rotated, the third rack 805 connected with the second gear 804 is moved, the L-shaped extrusion plate 802 connected with the third rack 805 is moved, and the two L-shaped extrusion plates 802 are close to each other to extrude the filter, the mixed brine in the filter is extruded, and the liquid passes through the L-shaped extrusion plate 802. When the moving block 702 is reset, the rotating rod 803 is reversely rotated by the torsional spring, the L-shaped extrusion plate 802 is moved to one end of the extrusion frame 8 by the third rack 805, the extruded liquid is discharged through the liquid discharge groove 800, so that the liquid is fully utilized, and waste is avoided.

[0092] A method for extracting lithium sulfate from salt lake brine, comprising the following steps:

[0093] Step one, add calcium oxide to the lithium-rich solution, adjust the pH to 10-13, and put it into the treatment tank 1;

[0094] Step two, filter the filter residue in the solvent through the plurality of filter plates 301, and in the filtering process, the installation cylinder 302 is rotated by starting the driving motor, and the two filter plates 301 are constantly switched to the cleaning mechanism;

[0095] Step three, the filter plate 301 is cleaned by the upper scraping assembly and the ejection assembly in the cleaning mechanism, and the filter is discharged into the collecting cylinder 5 through the feed inlet 501;

[0096] Step four, the filtrate is cooled to precipitate sodium sulfate decahydrate crystals, and the filtrate and filter residue are obtained after filtration, and the filtrate solvent is evaporated to obtain lithium sulfate.

[0097] Meanwhile, the contents not described in detail in the specification all belong to the prior art known to those skilled in the art.

[0098] In the description of the specification, the description of the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are contained in at least one embodiment or example of the application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0099] The preferred embodiments of the application disclosed above are only to help explain the application. The preferred embodiments are not intended to be exhaustive or to limit the application to the specific embodiments disclosed. Many modifications and variations will be apparent to those skilled in the art from the above disclosure and teachings. The employee selects and describes these embodiments in order to best explain the principles of the application and its practical application to thereby enable others skilled in the art to best utilize the application. The application is defined solely by the claims and equivalents thereof.

Claims

1. A device for extracting lithium sulfate from salt lake brine, comprising a processing tank (1), a top cover (102) for sealing is provided on the top of the processing tank (1), and a support frame (101) for supporting is provided outside the processing tank (1), characterized in that: Also includes: A filter element for filtering a solvent, the filter element comprising a plurality of partition plates (3), a filter plate (301) for filtering being fixedly connected between the plurality of adjacent partition plates (3), a mounting cylinder (302) being fixedly connected to the top of the plurality of partition plates (3), a drive motor being fixedly connected inside the processing tank (1), and an output shaft of the drive motor being fixedly connected to the mounting cylinder (302); A supporting circular frame (2) is fixedly connected to the interior of the processing tank (1), the supporting circular frame (2) is sleeved on the outside of the filter element and fits against the outsides of the plurality of partition plates (3), and two groups of cleaning mechanisms for cleaning the filter plates (301) are provided on the outside of the supporting circular frame (2), the cleaning mechanisms comprising a scraping assembly for cleaning the upper portion of the filter plates (301) and an ejection assembly for ejecting the lower portion of the filter plates (301); A collection cylinder (5) for discharging waste, the collection cylinder (5) being arranged below the mounting cylinder (302) and being rotatably connected to the plurality of partition plates (3), a feed port (501) being provided on the outside of the collection cylinder (5), and a cleaning mechanism discharging the filtered material from the filter plate (301) into the collection cylinder (5) through the feed port (501) for discharge; The scraping assembly comprises: An upper fixed frame (6), the upper fixed frame (6) is fixedly connected to the top of the supporting circular frame (2) and fits in contact with the top of the partition plate (3), and a first screw rod (601) is rotatably connected inside the upper fixed frame (6); a first movable plate (602), the first movable plate (602) being sleeved on the outside of the first screw rod (601) and connected to the first screw rod (601) via a ball nut pair, and the first movable plate (602) being slidably connected to the inner wall of the upper fixed frame (6); A scraper (607) is provided inside the supporting circular frame (2) and is used to scrape the top of the filter plate (301). Two second racks (606) are fixedly connected to the top of the scraper (607); Two support plates (603), both support plates (603) are fixedly connected to the bottom of the first movable plate (602), and the outer side of the support plate (603) is slidably connected to a first rack (605), the first rack (605) and the first movable plate (602) are connected via an elastic member, and the second rack (606) is slidably connected to the outer side of the support plate (603); Two first gears (604), the two first gears (604) are rotatably connected to the two support plates (603), and the first gears (604) are meshed and connected to the second rack (606), and the second rack (606) is slidably connected to the support plate (603). When the first rack (605) contacts one end of the upper fixed frame (6), the second rack (606) is driven by the first gear (604) to move toward the collection barrel (5); The ejection assembly comprises: A lower fixed frame (7), the lower fixed frame (7) is fixedly connected to the bottom of the supporting circular frame (2), and the lower fixed frame (7) is arranged below the filter plate (301), and the lower fixed frame (7) is connected to the collecting cylinder (5); A second screw rod (701), the second screw rod (701) is rotatably connected to the interior of the lower fixed frame (7), and the outer side of the second screw rod (701) is connected to a moving block (702) via a ball nut pair, and the moving block (702) is slidably connected to the bottom end of the interior of the lower fixed frame (7); A brush plate (703), the brush plate (703) is arranged at the bottom of the moving block (702), and a second telescopic rod (704) and a second spring (705) are fixedly connected between the brush plate (703) and the moving block (702), and the second spring (705) is sleeved on the outside of the second telescopic rod (704) for pulling the brush plate (703) down; Two wave plates (708), the two wave plates (708) are respectively fixedly connected to two sides of the interior of the lower fixed frame (7); Two fixed plates (706), both fixed plates (706) are fixedly connected to the bottom of the brush plate (703), and the outer side of the fixed plate (706) is rotatably connected to a rotating wheel (707), and the rotating wheel (707) slides on the top of the wave plate (708). When the rotating wheel (707) slides on the wave plate (708), the brush plate (703) is pushed up and down through the fixed plate (706), and the filtered material on the filter plate (301) is ejected; It also includes an air blowing assembly arranged on one side of the brush plate (703), the air blowing assembly including: A fixed side plate (709), the fixed side plate (709) is fixedly connected to one side of the brush plate (703); An air jet head (710), the air jet head (710) is fixedly connected to the top of the brush plate (703), and a plurality of nozzles are provided on the outside of the air jet head (710); A plurality of fixed cylinders (713), the outer sides of the plurality of fixed cylinders (713) are fixedly connected to the outer side of the moving block (702), and the interiors of the plurality of fixed cylinders (713) are provided with connecting rods (714), the connecting rods (714) pass through the fixed cylinders (713) and are slidably connected to the fixed cylinders (713), and the connecting rods (714) are fixedly connected to the fixed side plates (709); An airbag (715) is disposed inside the fixed cylinder (713), with both ends of the airbag (715) fixedly connected to the connecting rod (714) and the top end of the fixed cylinder (713), respectively. A connecting pipe is fixedly connected between the airbag (715) and the spray head (710). When the connecting rod (714) rises, it squeezes the airbag (715), and the gas inside the airbag (715) is discharged into the spray head (710) through the connecting pipe for spraying. A one-way air inlet valve is disposed outside the airbag (715); The elastic member includes a connecting frame (608) fixedly connected to one side of the first movable plate (602); a first telescopic rod (609) and a first spring (610) are fixedly connected between the connecting frame (608) and the first rack (605); the first spring (610) is sleeved on the outside of the first telescopic rod (609) and is used to push the first rack (605) to reset; The bottom of the collecting cylinder (5) is fixedly connected to an extrusion frame (8), and the bottom of the extrusion frame (8) is fixedly connected to a discharge pipe. A control valve (801) for controlling the opening of the pipe is provided on the outside of the discharge pipe. Both ends of the bottom of the extrusion frame (8) are provided with drainage grooves (800) for draining liquid. Two L-shaped extrusion plates (802) are provided inside the extrusion frame (8), and the two L-shaped extrusion plates (802) are arranged opposite to each other. The L-shaped extrusion plates (802) pass through one side of the extrusion frame (8) and are slidably connected to the extrusion frame (8); During the rotation and switching of the plurality of filter plates (301), the scraper (607) and the upper fixed frame (6) will not push the filtered material on the upper portion of the filter plate (301). During the process of the scraper (607) pushing the filtered material on the top of the filter plate (301), when the first movable plate (602) approaches one end of the first screw rod (601), the first rack (605) contacts the end of the upper fixed frame (6), causing the first rack (605) to move in the opposite direction of the first movable plate (602), causing the first rack (605) to drive the meshing first gear (604) to rotate, the first gear (604) drives the meshing second rack (606) to move, and the second rack (606) drives the fixedly connected scraper (607), causing the scraper (607) to continue to move forward on the top of the filter plate (301), completely pushing the filtered material into the inside of the collection tube for cleaning, thereby ensuring that the filtered material on the filter plate (301) is thoroughly cleaned; Two third racks (805) are fixedly connected to one side of the two L-shaped extrusion plates (802), the third racks (805) pass through the extrusion frame (8) and are slidably connected to the extrusion frame (8), the tops of the two third racks (805) are meshed with second gears (804), a rotating rod (803) is fixedly connected between the two second gears (804), and both ends of the rotating rod (803) are rotatably connected to side support plates (808), the side support plates (808) are fixedly connected to the extrusion frame (8), and the rotating rod ( A torsion spring is provided between the rotating rod (803) and the side support plate (808), and the two ends of the torsion spring are fixedly connected to the rotating rod (803) and the side support plate (808), respectively. A winding disk (806) is fixedly connected to the outside of the rotating rod (803), and a traction rope (809) is wound around the outside of the winding disk (806). The traction rope (809) passes through the bottom of the lower fixed frame (7) and is fixedly connected to the moving block (702). When the moving block (702) moves, the winding disk (806) is pulled to move by the traction rope (809).

2. The device for extracting lithium sulfate from salt lake brine according to claim 1, characterized in that: A connecting tube (401) is provided inside the treatment tank (1), the connecting tube (401) being fixedly connected to the treatment tank (1) via a support plate, and a liquid inlet pipe (402) for water inlet is fixedly connected to the outside of the connecting tube (401), the liquid inlet pipe (402) extending to the outside of the treatment tank (1) and fixedly connected to the bottom of the connecting tube (401) with a plurality of liquid spraying branch pipes (403), the plurality of liquid spraying branch pipes (403) being respectively provided on the tops of the plurality of filter plates (301), and a liquid drain pipe (104) for water discharge is provided at the bottom of the treatment tank (1).

3. A method for extracting lithium sulfate from salt lake brine, applicable to the device for extracting lithium sulfate from salt lake brine as claimed in any one of claims 1 to 2, characterized in that: The following steps are involved: Step 1: Add calcium oxide to the lithium-rich solution, adjust the pH to 10-13, and put it into the treatment tank (1); Step 2: filtering the filter residue in the solvent through a plurality of filter plates (301). During the filtering process, the drive motor is started to drive the mounting cylinder (302) to rotate, and two filter plates (301) are continuously switched to the inside of the cleaning mechanism; Step 3: Clean the filter plate (301) through the upper scraping assembly and the ejecting assembly in the cleaning mechanism, and discharge the filtered material into the collection cylinder (5) through the feed port (501); Step 4: Cool the filtrate to precipitate sodium sulfate decahydrate crystals, filter to obtain a filtrate and a filter residue, and evaporate the solvent of the filtered filtrate to obtain lithium sulfate.

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