Device and method for extracting lithium sulfate in salt lake brine

Abstract

The invention discloses a device and a method for extracting lithium sulfate in salt lake brine, and relates to the field of lithium sulfate production process, the device comprises a treatment tank, an upper cover for sealing is arranged at the top of the treatment tank, a supporting frame for supporting is arranged outside the treatment tank, and the device further comprises a filtering part for filtering a solvent, a filter plate is cleaned through an upper scraping assembly and an ejection assembly in the cleaning mechanism, filtered materials are discharged into a collecting barrel through a feeding port to be discharged, the filter plate is rotated into the cleaning mechanism, the situation that the filtered materials penetrate through the filter plate due to scraping of the filtered materials in the cleaning and filtering process is avoided, and the purity of filtered liquid is guaranteed; and in the cleaning process, filtering is not affected, and equipment does not need to be paused for cleaning.

Description

Technical Field

[0001] The invention relates to the field of lithium sulfate production technology, and in particular to a device and method for extracting lithium sulfate from salt lake brine. Background Art

[0002] Lithium sulfate is widely used in many fields, such as in the production of special high-strength glass, flavoring agent for food and synthetic beverages, etc.

[0003] A device for extracting lithium carbonate from salt lake brine with patent number CN115531908B is now disclosed, comprising a heating tank mechanism, a driving mechanism is fixedly installed on the top of the heating tank mechanism, a support column is fixedly connected to the ground of the heating tank mechanism, the heating tank mechanism comprises a tank shell and a top cover, the top cover is movably connected to the top surface of the tank shell, and a heating chamber and a stirring chamber are arranged inside the tank shell. The present invention heats the heating oil in the heating chamber, uses the high-temperature oil in the heating chamber to heat the brine in the stirring chamber by heat transfer, and then starts the servo motor to rotate the stirring rod, so that the bottom end of the stirring rod drives the arc plate in the stirring rod through the connecting bearing to stir the brine received in the hemispherical liquid storage box, uses the hemispherical liquid storage box to gather the brine at the bottom of the device and drives the stirring net through the arc plate to fully stir and heat the brine, effectively improving the heating effect of the device on the residual brine.

[0004] The above scheme is the process of brine evaporation and crystallization. When extracting lithium sulfate from the brine, calcium oxide needs to be added to the lithium-rich solution, and the pH is adjusted to 10-13 to perform solid-liquid separation to obtain filtrate and filter residue. However, during the filtration process, the filter residue will be blocked on the filter net. After filtering for a certain period of time, it needs to be cleaned. However, if the cleaning requires suspending the processing, affecting the work progress, if the filter residue on the filter net is directly scraped, the filter residue may pass through the filter net and affect the liquid that has been filtered. In addition, the filter residue still exists on the filter net, and the device needs to be opened to filter out the filtered material.

[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 of the invention

[0006] The object of the present invention is to provide a device and method for extracting lithium sulfate from salt lake brine to solve the problems of defects of the prior art mentioned in the above background technology.

[0007] Based on the above ideas, the present invention provides the following technical solutions: a device for extracting lithium sulfate from salt lake brine, comprising a processing tank, a top cover for sealing is provided on the top of the processing tank, and a support frame for supporting is provided outside the processing tank, and also includes: A filter element for filtering the solvent, the filter element comprising a plurality of partition plates, a filter plate for filtering is fixedly connected between the plurality of adjacent partition plates, a mounting cylinder is fixedly connected to the top of the plurality of partition plates, a drive motor is fixedly connected inside the processing tank, and an output shaft of the drive motor is fixedly connected to the mounting cylinder; A supporting circular frame fixedly connected to the inside of the processing tank, the supporting circular frame is sleeved on the outside of the filter element and fits with the outside of multiple partition plates, and two groups of cleaning mechanisms for cleaning the filter plates are arranged on the outside of the supporting circular frame, the cleaning mechanisms include 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; The collecting cylinder is used for discharging waste. The collecting cylinder is arranged below the mounting cylinder and is rotatably connected with a plurality of partition plates. A feed port is provided on the outer side of the collecting cylinder. The cleaning mechanism discharges the filtered material of the filter plate into the collecting cylinder through the feed port and discharges it.

[0008] As a further solution of the present invention: the scraping assembly comprises: An upper fixed frame, the upper fixed frame is fixedly connected to the top of the supporting circular frame and fits with the top of the partition plate, and a first screw rod is rotatably connected inside the upper fixed frame; A first movable plate, which is sleeved on the outside of the first screw and connected to the first screw via a ball nut pair, and is slidably connected to the inner wall of the upper fixed frame; A scraper, which is arranged inside the supporting circular frame and is used to scrape the top of the filter plate. Two second racks are fixedly connected to the top of the scraper; Two support plates, both of which are fixedly connected to the bottom of the first movable plate, and the outer side of the support plate is slidably connected with a first rack, the first rack is connected to the first movable plate through an elastic member, and the second rack is slidably connected to the outer side of the support plate; Two first gears are rotatably connected to the two support plates respectively, and the first gear is meshed with the second rack, and the second rack is slidably connected to the support plate. When the first rack contacts one end of the upper fixed frame, the second rack is driven to move toward the collection barrel through the first gear.

[0009] As a further solution of the present invention: the ejection assembly comprises: A lower fixing frame, which is fixedly connected to the bottom of the supporting circular frame and is arranged below the filter plate, and is in communication with the collecting cylinder; A second screw rod, the second screw rod is rotatably connected to the interior of the lower fixed frame, and the 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; A brush plate, the brush plate is arranged at the bottom 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; Two corrugated plates, the two corrugated plates are respectively fixedly connected to two sides of the lower fixed frame; Two fixed plates, both fixed plates 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.

[0010] As a further solution of the present invention: it also includes a blowing assembly arranged on one side of the brush plate, and the blowing assembly includes: A fixed side plate, the fixed side plate is fixedly connected to one side of the brush plate; The nozzle is fixedly connected to the top of the brush plate, and a plurality of nozzles are arranged on the outside of the nozzle; A plurality of fixed cylinders, the outer sides of the plurality of fixed cylinders are fixedly connected to the outer sides of the moving blocks, and the interiors of the plurality of fixed cylinders are provided with connecting rods, the connecting rods penetrate the fixed cylinders and are slidably connected to the fixed cylinders, and the connecting rods are fixedly connected to the fixed side plates; 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 of the fixed tube respectively, and a connecting pipe is fixedly connected 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 for spraying. A one-way air inlet valve is arranged on the outside of the airbag.

[0011] 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 a plurality of liquid spray branch pipes, the plurality of liquid spray branch pipes are respectively arranged on the top of a plurality of filter plates, and a liquid drain pipe for drainage is arranged at the bottom of the treatment tank.

[0012] 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, a first telescopic rod and a first spring are fixedly connected between the connecting frame and the first rack, and the first spring is sleeved on the outside of the first telescopic rod to push the first rack to reset.

[0013] As a further solution of the present invention: the bottom of the collecting cylinder is fixedly connected to an extrusion frame, the bottom of the extrusion frame is fixedly connected to a discharge pipe, a control valve for controlling the opening of the pipeline is arranged outside the discharge pipe, drainage grooves for draining liquid are arranged at both ends of the bottom of the extrusion frame, and two L-shaped extrusion plates are arranged inside the extrusion frame, the two L-shaped extrusion plates are arranged opposite to each other, and the L-shaped extrusion plates pass through one side of the extrusion frame and are slidably connected to the extrusion frame.

[0014] As a further solution of the present invention: two third racks are fixedly connected to one side of the two L-shaped extrusion plates, the third racks penetrate the extrusion frame and are slidably connected to the extrusion frame, the tops of the two third racks are meshed with second gears, a rotating rod is fixedly connected between the two second gears, both ends of the rotating rod are rotatably connected to side support plates, the side support plates are fixedly connected to the extrusion frame, and a torsion spring is arranged between the rotating rod and the side support plate, and the two ends of the torsion spring are respectively fixedly connected to the rotating rod and the side support plate.

[0015] As a further solution of the present invention: a winding drum is fixedly connected to the outer side of the rotating rod, and a traction rope is wound around the outer side of the winding drum. The traction rope passes through the bottom of the lower fixed frame and is fixedly connected to the moving block. When the moving block moves, the winding drum is pulled to move by the traction rope.

[0016] A method for extracting lithium sulfate from salt lake brine, comprising the following steps: Step 1: Add calcium oxide to the lithium-rich solution, adjust the pH to 10-13, and put it into the treatment tank; Step 2: Filter the filter residue in the solvent through multiple filter plates. During the filtering process, the drive motor is started to drive the installation cylinder to rotate, and two filter plates are continuously switched to the inside of the cleaning mechanism; Step 3: Clean the filter plate through the upper scraping assembly and the ejecting assembly in the cleaning mechanism, and discharge the filtered material into the collecting cylinder through the feed port for discharge; 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.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. Clean the filter plate through the upper scraping assembly and the ejecting assembly in the cleaning mechanism, discharge the filtered material into the collecting cylinder through the feed port, and rotate the filter plate to the cleaning mechanism. During the cleaning and filtration, the scraping of the filtered material is avoided, causing the filtered material to pass through the filter plate, ensuring the purity of the filtered liquid. The filtration will not be affected during the cleaning process, and there is no need to stop the equipment for cleaning.

[0018] 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. During the process of the scraper pushing the filtered material on the top of the filter plate, when the first movable plate is close to 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, 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, completely pushing the filtered material into the collection tube for cleaning, thereby ensuring that the filtered material on the filter plate is thoroughly cleaned.

[0019] 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 arranged on the brush plate continuously lift the filter plate, and cooperate with the scraper on the filter plate to push it, so as to ensure that the filter plate is fully cleaned and avoid the situation where the filtered material is stuck inside the filter plate and cannot be cleaned.

[0020] 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, and the mixed brine in the filtrate is squeezed out. The liquid passes through the L-shaped extrusion plate. When the moving block is reset, the rotating rod is driven to rotate in the opposite direction through the torsion spring, and then the third rack pulls the L-shaped extrusion plate to move to one end of the extrusion frame, and the squeezed liquid is discharged through the drainage groove, thereby ensuring full utilization of the liquid and avoiding waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 It is a schematic diagram of the overall structure of the device for extracting lithium sulfate from salt lake brine of the present invention; Figure 2 It is a schematic diagram of the cross-sectional structure of the processing tank of the present invention; Figure 3 It is a schematic diagram of the supporting circular frame structure of the present invention; Figure 4 It is a schematic diagram of the structure of the liquid spray branch pipe of the present invention; Figure 5 It is a schematic diagram of the separation structure of the filter element and the supporting circular frame of the present invention; Figure 6 It is a schematic diagram of the upper fixing frame structure of the present invention; Figure 7 It is a schematic diagram of the scraper structure of the present invention; Figure 8 It is a schematic diagram of the structure of the scraping assembly of the present invention; Fig. 9 It is a schematic diagram of the structure of the ejection assembly of the present invention; Fig.10 It is a schematic diagram of the structure of the jet assembly of the present invention; Fig.11 It is a schematic diagram of the structure of the extrusion frame of the present invention; Fig.12 It is a schematic diagram of the structure of the L-shaped extruded plate of the present invention.

[0023] In the figure: 1, treatment tank; 101, support frame; 102, upper cover; 104, drainage pipe; 2, support round frame; 3, partition plate; 301, filter plate; 302, installation cylinder; 401, connecting cylinder; 402, liquid inlet pipe; 403, liquid spray branch pipe; 5, collecting cylinder; 501, feed port; 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, jet head; 713, fixed cylinder; 714, connecting rod; 715, airbag; 8, extrusion frame; 800, drainage trough; 801, control valve; 802, L-shaped extrusion plate; 803, rotating rod; 804, second gear; 805, third rack; 806, take-up reel; 808, side support plate; 809, traction rope. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0025] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "all around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0026] like Figures 1 to 12 As shown, a device and method for extracting lithium sulfate from salt lake brine include the following embodiments: Embodiment 1: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, it includes a processing tank 1, a top cover 102 for sealing is arranged on the top of the processing tank 1, and a support frame 101 for supporting is arranged outside the processing tank 1, and also includes: A filter element for filtering the solvent, the filter element comprises a plurality of partition plates 3, a filter plate 301 for filtering is fixedly connected between the plurality of adjacent partition plates 3, a mounting cylinder 302 is fixedly connected to the top of the plurality of partition plates 3, a driving motor is fixedly connected inside the processing tank 1, and an output shaft of the driving motor is fixedly connected to the mounting cylinder 302; A supporting circular frame 2 is fixedly connected to the inside of the processing tank 1, and the supporting circular frame 2 is sleeved on the outside of the filter element and fits with the outside of the plurality of partition plates 3. Two sets of cleaning mechanisms for cleaning the filter plates 301 are arranged on the outside of the supporting circular frame 2, and the cleaning mechanisms include a scraping assembly for cleaning the upper part of the filter plate 301 and an ejection assembly for ejecting the lower part of the filter plate 301; The collecting barrel 5 for discharging waste is arranged below the mounting barrel 302 and is rotatably connected to the plurality of partition plates 3. A feed port 501 is provided on the outer side of the collecting barrel 5. The cleaning mechanism discharges the filtered material of the filter plate 301 into the collecting barrel 5 through the feed port 501 and discharges it.

[0027] In specific implementation, calcium oxide is added to the lithium-rich solution, the pH is adjusted to 10-13, and the solution is put into the treatment tank 1. The filter residue in the solvent is filtered through multiple filter plates 301. During the filtering process, the installation cylinder 302 is driven to rotate by starting the drive motor, and two filter plates 301 are continuously switched to the inside of the cleaning mechanism. The filter plates 301 are cleaned by the upper scraping component and the ejecting component in the cleaning mechanism, and the filtrate is discharged into the collection cylinder 5 through the feed port 501 for discharge. The filter plate 301 is rotated to the cleaning mechanism. During the cleaning and filtration, the scraping of the filtrate is avoided, causing the filtrate to pass through the filter plate 301, thereby ensuring the purity of the filtered liquid. The filtration will not be affected during the cleaning process, and there is no need to pause the equipment for cleaning.

[0028] In this embodiment, a connecting cylinder 401 is provided inside the processing tank 1, and the connecting cylinder 401 is fixedly connected to the processing tank 1 through a support plate, and a liquid inlet pipe 402 for water intake is fixedly connected to the outside of the connecting cylinder 401, and the liquid inlet pipe 402 extends to the outside of the processing tank 1. The bottom of the connecting cylinder 401 is fixedly connected with multiple liquid spray branch pipes 403, and the multiple liquid spray branch pipes 403 are respectively arranged on the top of multiple filter plates 301, and a liquid drain pipe 104 for drainage is provided at the bottom of the processing tank 1.

[0029] In specific implementation, when the treated liquid enters the connecting tube 401 through the liquid inlet pipe 402, it is discharged through multiple liquid spray branches 403 at the bottom of the connecting tube 401. The multiple liquid spray branches 403 are aligned with the filter plates 301 between the multiple partition plates 3 to ensure that the filter plates 301 fully filter the liquid.

[0030] Embodiment 2: Figure 7 and Figure 8 As shown, the scraping assembly includes: The upper fixed frame 6 is fixedly connected to the top of the supporting circular frame 2 and fits with the top of the partition plate 3. The upper fixed frame 6 is rotatably connected to the first screw rod 601; A first movable plate 602, which is sleeved on the outside of the first screw rod 601 and connected to the first screw rod 601 through a ball nut pair, and the first movable plate 602 is slidably connected to the inner wall of the upper fixed frame 6; The scraper 607 is arranged inside the supporting circular frame 2 to scrape the top of the filter plate 301. The top of the scraper 607 is fixedly connected to two second racks 606; Two support plates 603, both of which are fixedly connected to the bottom of the first movable plate 602, and the outer side of the support plate 603 is slidably connected with a first rack 605, the first rack 605 is connected to the first movable plate 602 through an elastic member, and the second rack 606 is slidably connected to the outer side of the support plate 603; Two first gears 604 are rotatably connected to the two support plates 603 respectively, and the first gear 604 is meshingly 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 to move toward the collecting tube 5 through the first gear 604.

[0031] 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, and the first spring 610 is sleeved on the outside of the first telescopic rod 609 to push the first rack 605 to reset.

[0032] During specific implementation, when the driving motor drives the installation cylinder 302 to rotate, the installation cylinder 302 drives multiple 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 the top of the filter plate 301 to ensure that the processing liquid does not flow in during the cleaning process, and a micro motor is arranged inside the supporting circular frame 2, and the micro motor drives the first screw rod 601 to rotate, and the first screw rod 601 drives the first movable plate 602 to move, and the first movable plate 602 drives the scraper 607 to move through the first rack 605 and the support plate 603 and the second rack 606, and drives the scraper 607 from the inside of the supporting circular frame 2 to the top of the filter plate 301 to scrape the filtered material on the filter plate 301. In this solution, the scraper 607 is inside the supporting circular frame 2, and between multiple filter plates During the rotation and switching process of 301, the scraper 607 and the upper fixed frame 6 will not push the filtered material on the upper part 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 is close to one end of the first screw rod 601, the first rack 605 contacts the end of the upper fixed frame 6, so that the first rack 605 moves in the opposite direction of the first movable plate 602, so that the first rack 605 drives the meshing first gear 604 to rotate, and the first gear 604 drives the meshing second rack 606 to move, and 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, and completely pushes the filtered material into the collection tube 5 for cleaning, thereby ensuring that the filtered material on the filter plate 301 is thoroughly cleaned.

[0033] Embodiment 2: Figure 8 , Fig. 9 and Fig.10 As shown, the ejector assembly includes: A lower fixed frame 7, which is fixedly connected to the bottom of the supporting circular frame 2, and is disposed below the filter plate 301, and is communicated with 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 through 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 lower fixed frame 7; Two 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 with 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 to eject the filtered material on the filter plate 301.

[0034] In the specific implementation, when the filter plate 301 to be cleaned rotates to the top of the lower fixed frame 7, when the scraping component in the upper fixed frame 6 cleans the filter plate 301, the lower fixed frame 7 receives the filtered material to prevent the filtered material from passing through the filter plate 301 during the cleaning process and affecting the filtered brine, and an ejection component is arranged on the top of the lower fixed frame 7. In this solution, a motor is arranged inside the lower fixed frame 7, and the output shaft of the motor drives the second screw rod 701 to rotate, driving the moving block 702 outside the second screw rod 701 to move in the lower fixed frame 7. The filter plate 301 is moved by the moving block 702 through the second telescopic rod 704 and the second spring 705, and the rotating wheel 707 on the 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 continuously rises and falls, and the bristles arranged on the brush plate 703 continuously lift the filter plate 301, and cooperate with the scraper 607 on the filter plate 301 to push, so as to ensure that the filter plate 301 is fully cleaned and avoid the situation that the filtered material is stuck inside the filter plate 301 and cannot be cleaned.

[0035] In this embodiment, Fig.10 As shown, it also includes a blowing assembly arranged on one side of the brush plate 703, and the blowing assembly includes: A fixed side plate 709, the fixed side plate 709 is fixedly connected to one side of the brush plate 703; The nozzle 710 is fixedly connected to the top of the brush plate 703, and a plurality of nozzles are arranged on the outside of the nozzle 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 penetrate 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; The airbag 715 is arranged inside the fixed tube 713, and the two ends of the airbag 715 are fixedly connected to the connecting rod 714 and the top of the fixed tube 713 respectively, and a connecting pipe is fixedly connected between the airbag 715 and the nozzle 710. When the connecting rod 714 rises, the airbag 715 is squeezed, and the gas inside the airbag 715 is discharged into the nozzle 710 through the connecting pipe for spraying out. A one-way air inlet valve is arranged on the outside of the airbag 715.

[0036] During specific implementation, when the brush plate 703 drives the fixed side plate 709 to move, when the brush plate 703 rises, the connecting rod 714 compresses the airbag 715 on the top of the connecting rod 714, and the gas inside the airbag 715 is transported to the inside of the nozzle 710 through the connecting pipe, and the nozzle 710 sprays the filter plate 301, thereby further improving the filtering effect. When the fixed side plate 709 descends, the connecting rod 714 pulls the airbag 715 to inhale, preparing for the next inflation.

[0037] Embodiment 3: Fig.11 and Fig.12 As shown, the bottom of the collecting cylinder 5 is fixedly connected to an extrusion frame 8, the bottom of the extrusion frame 8 is fixedly connected to a discharge pipe, the outside of the discharge pipe is provided with a control valve 801 for controlling the opening of the pipeline, both ends of the bottom of the extrusion frame 8 are provided with drainage grooves 800 for draining liquid, and two L-shaped extrusion plates 802 are provided inside the extrusion frame 8, the two L-shaped extrusion plates 802 are arranged opposite to each other, and the L-shaped extrusion plates 802 pass through one side of the extrusion frame 8 and are slidably connected to the extrusion frame 8.

[0038] Two third racks 805 are fixedly connected to one side of the two L-shaped extrusion plates 802. The third racks 805 penetrate 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. 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 a torsion spring is arranged between the rotating rod 803 and the side support plate 808. The two ends of the torsion spring are respectively fixedly connected to the rotating rod 803 and the side support plate 808.

[0039] A winding drum 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 drum 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 drum 806 is pulled to move by the traction rope 809.

[0040] In specific implementation, when the scraped filtrate falls into the extrusion frame 8 through the collecting tube 5, the control valve 801 is in a closed state. When the moving block 702 moves, the winding disk 806 is rotated by pulling the traction rope 809, and the winding disk 806 drives the rotating rod 803 to rotate. When the rotating rod 803 rotates, it drives the fixedly connected second gear 804 to rotate, and the second gear 804 drives the meshingly connected third rack 805 to move, so that the third rack 805 pushes the fixedly connected L-shaped extrusion plate 802 to move, so that the two L-shaped extrusion plates 802 are close to each other to squeeze the filtrate, and the mixed brine in the filtrate is squeezed out. The liquid passes through the L-shaped extrusion plate 802. When the moving block 702 is reset, the rotating rod 803 is driven to rotate in the opposite direction by the torsion spring, and then the third rack 805 pulls the L-shaped extrusion plate 802 to move toward one end of the extrusion frame 8, and the squeezed liquid is discharged through the drainage groove 800, thereby ensuring full utilization of the liquid and avoiding waste.

[0041] A method for extracting lithium sulfate from salt lake brine, comprising the following steps: 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: Filter the filter residue in the solvent through multiple filter plates 301. During the filtering process, the drive motor is started to drive the installation 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 collecting tube 5 through the feed port 501 for discharge; 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.

[0042] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0043] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation 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.

[0044] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A device for extracting lithium sulfate from salt lake brine, comprising a processing tank (1), wherein a top cover (102) for sealing is arranged on the top of the processing tank (1), and a support frame (101) for supporting is arranged 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) fixedly connected to the inside of the processing tank (1), the supporting circular frame (2) being sleeved on the outside of the filter element and being in contact with the outsides of the plurality of partition plates (3), two groups of cleaning mechanisms for cleaning the filter plates (301) being arranged on the outside of the supporting circular frame (2), the cleaning mechanisms comprising a scraping assembly for cleaning the upper part of the filter plate (301) and an ejecting assembly for ejecting the lower part of the filter plate (301); A collection barrel (5) for discharging waste materials, the collection barrel (5) being arranged below the mounting barrel (302) and being rotatably connected to the plurality of partition plates (3), a feed inlet (501) being provided on the outside of the collection barrel (5), and a cleaning mechanism discharging the filtered material of the filter plate (301) into the collection barrel (5) through the feed inlet (501) for discharge.

2. A device for extracting lithium sulfate from salt lake brine according to claim 1, characterized in that: 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 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), the scraper (607) is arranged inside the supporting circular frame (2) and is used to scrape the top of the filter plate (301), and 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) are rotatably connected to the two support plates (603) respectively, and the first gear (604) is meshedly 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).

3. The device for extracting lithium sulfate from salt lake brine according to claim 1, characterized in that: 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) being arranged at the bottom of the moving block (702), and a second telescopic rod (704) and a second spring (705) being fixedly connected between the brush plate (703) and the moving block (702), and the second spring (705) being sleeved on the outside of the second telescopic rod (704) and used 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) are fixedly connected to the bottom of the brush plate (703), and a rotating wheel (707) is rotatably connected to the outer side of the fixed plate (706). 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 to rise and fall continuously through the fixed plate (706), so that the filtered matter on the filter plate (301) is ejected.

4. The device for extracting lithium sulfate from salt lake brine according to claim 1, characterized in that: 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) being 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 arranged 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 all fixedly connected to the outer side of the moving block (702), and the interiors of the plurality of fixed cylinders (713) are all provided with connecting rods (714), the connecting rods (714) penetrate 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 arranged inside the fixed tube (713), and two ends of the airbag (715) are respectively fixedly connected to the connecting rod (714) and the top of the inside of the fixed tube (713), and 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 out. A one-way air inlet valve is arranged outside the airbag (715).

5. 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) is 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) extends to the outside of the treatment tank (1), and a plurality of liquid spraying branch pipes (403) are fixedly connected to the bottom of the connecting tube (401) and the plurality of liquid spraying branch pipes (403) are respectively arranged on the top of a plurality of filter plates (301), and a liquid drain pipe (104) for draining water is provided at the bottom of the treatment tank (1).

6. A device for extracting lithium sulfate from salt lake brine according to claim 2, characterized in that: The elastic member comprises 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.

7. The device for extracting lithium sulfate from salt lake brine according to claim 6, characterized in that: The bottom of the collecting cylinder (5) is fixedly connected to an extrusion frame (8), 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 arranged outside the discharge pipe, both ends of the bottom of the extrusion frame (8) are provided with drainage grooves (800) for draining liquid, and two L-shaped extrusion plates (802) are arranged inside the extrusion frame (8), the two L-shaped extrusion plates (802) are arranged opposite to each other, and the L-shaped extrusion plates (802) pass through one side of the extrusion frame (8) and are slidably connected to the extrusion frame (8).

8. The device for extracting lithium sulfate from salt lake brine according to claim 1, characterized in that: Two third racks (805) are fixedly connected to one side of the two L-shaped extrusion plates (802); the third racks (805) penetrate the extrusion frame (8) and are slidably connected to the extrusion frame (8); the tops of the two third racks (805) are meshedly connected to second gears (804); a rotating rod (803) is fixedly connected between the two second gears (804); 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); a torsion spring is provided between the rotating rod (803) and the side support plate (808); and both ends of the torsion spring are fixedly connected to the rotating rod (803) and the side support plate (808), respectively.

9. The device for extracting lithium sulfate from salt lake brine according to claim 8, characterized in that: The outer side of the rotating rod (803) is fixedly connected to a winding drum (806), and the outer side of the winding drum (806) is wound with a traction rope (809), which 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 drum (806) is pulled by the traction rope (809) to move.

10. 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 9, 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) using the upper scraping assembly and the ejecting assembly in the cleaning mechanism, and discharge the filtered material into the collecting cylinder (5) through the feed inlet (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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