Electrodialysis device for lithium extraction from salt lake and method for lithium extraction from salt lake

Abstract

The present invention relates to the technical field of lithium extraction from salt lakes, and in particular to an electrodialysis device for lithium extraction from a salt lake and a method for lithium extraction from a salt lake. The electrodialysis device comprises a frame and a plurality of electrode sheets arranged inside the frame, and a plurality of membrane stacks are fixedly connected inside the plurality of electrode sheets. The electrodialysis device further comprises: water inlet pipes fixedly connected to the top of the electrode sheets and respectively in communication with the plurality of membrane stacks, wherein a plurality of water outlet pipes in communication with the membrane stacks are fixedly connected to the bottom of the electrode sheets, separation plates for separating raw water are fixedly connected to the interiors of the water inlet pipes, and water filtration assemblies for pretreating the raw water are provided inside the water inlet pipes; and a plurality of flow baffles configured to be all rotatably connected to the interiors of the water inlet pipes for buffering the raw water, wherein an oil housing storing a hydraulic oil is fixedly connected to the bottom of each water inlet pipe, and a plurality of turbulence control assemblies for adjusting the angle of the flow baffles are provided on the top of the oil housing. A three-leaf filter screen can efficiently filter out impurities and particulate matters from the raw water, ensuring that the water entering the membrane stacks is clean.

Description

An electrodialysis apparatus and method for lithium extraction from salt lakes Technical Field

[0001] This invention relates to the field of lithium extraction technology from salt lakes, specifically to an electrodialysis device and a method for lithium extraction from salt lakes. Background Technology

[0002] Lithium extraction from salt lakes is a crucial process for extracting lithium resources from salt lake brine. Lithium is a key material in new energy, electronics, and high-end manufacturing, and its demand has been steadily increasing in recent years. Traditional methods for lithium extraction from salt lakes mainly include evaporation crystallization, precipitation, and adsorption. However, these methods suffer from high energy consumption, long production cycles, and environmental pollution, making them unsuitable for large-scale industrial production. Electrodialysis, as a highly efficient and environmentally friendly separation technology, has received widespread attention and application in the field of lithium extraction from salt lakes in recent years.

[0003] For example, patent document CN118874223B discloses an environmentally friendly lithium extraction device and process for recycling waste batteries. This includes a bipolar membrane electrodialysis device, comprising two end plates, with an electrodialysis component for concentrating the lithium-containing solution located between the end plates. The electrodialysis component includes multiple partition plates, with a first electrode plate and a second electrode plate fixedly positioned in the middle of each partition plate. In the energized state, the electrostrictive mesh drives the bipolar membrane and cation membrane to form a specific bending structure, extending the time the raw water remains in the acid and concentrate channels, resulting in more complete electrolysis. During cleaning, the device is de-energized, and both the bipolar membrane and cation membrane are in a relaxed state. Cleaning fluid is injected into the acid and concentrate channels in a pulsed manner, causing the cleaning fluid to rapidly flush the bipolar membrane and cation membrane. Simultaneously, the bipolar membrane and cation membrane continuously oscillate and rub against each other, accelerating descaling, thus achieving rapid and effective cleaning.

[0004] The aforementioned prior art has made progress in innovatively driving the bipolar membrane and cation membrane to form a specific curved structure by setting an electrostrictive mesh. This design aims to extend the residence time of raw water in the acid and concentrate channels to promote the full progress of the electrolysis process. However, in practical applications, the raw water inevitably contains a certain amount of impurities. When this raw water containing impurities enters the curved structure composed of the bipolar membrane and cation membrane, it will be subjected to a certain impact due to the special morphology of the structure and the effects of fluid dynamics. This impact may not only cause impurity particles in the raw water to collide with the membrane surface, but may also exacerbate the accumulation of impurities within the membrane. In particular, when the bipolar membrane and cation membrane form a specific curved structure, some tiny depressions or gaps may form on the inner surface of the membrane, and these areas are more likely to become "hot spots" for impurity accumulation. Over time, these accumulated impurities will gradually form a scale layer, covering the membrane surface, thereby seriously affecting the membrane permeability and electrolysis efficiency. To address this, this application proposes an electrodialysis device and method for lithium extraction from salt lakes. Summary of the Invention

[0005] The purpose of this invention is to provide an electrodialysis device and a method for lithium extraction from salt lakes, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an electrodialysis device for lithium extraction from salt lakes, comprising a frame and multiple electrode plates disposed therein, wherein multiple membrane stacks are fixedly connected inside the multiple electrode plates, and further comprising:

[0007] The inlet pipe is fixedly connected to the top of the electrode plate and communicates with multiple membrane stacks. The bottom of the electrode plate is fixedly connected to multiple outlet pipes that communicate with the membrane stacks. The inside of the inlet pipe is fixedly connected to a separator plate for separating the raw water. The inside of the inlet pipe is equipped with a water filtration assembly for pre-treating the raw water.

[0008] The flow buffer is constructed as multiple flow buffers that are rotatably connected inside the water inlet pipe to buffer the raw water. The bottom of the water inlet pipe is fixedly connected to an oil tank containing oil, and the top of the oil tank is provided with multiple turbulence control components for adjusting the angle of the flow buffer.

[0009] A diverter plate is rotatably connected to one side of a partition plate to push the raw water. The internal structure of the diverter plate has a liquid chamber for storing precipitant. A crank is rotatably connected to one side of the partition plate, and a discharge assembly adapted to the crank is provided inside the liquid chamber.

[0010] Preferably, the water filtration assembly includes multiple three-leaf filter screens disposed inside the water inlet pipe, and one end of each of the multiple three-leaf filter screens is fixedly connected to a connecting shaft that is rotatably connected to a partition plate. A multiple inclined groove is provided on one side of the partition plate, and a cleaning roller that can slidably contact the three-leaf filter screen is slidably connected in each of the multiple inclined grooves. One end of the cleaning roller is fixedly connected to a tension spring that is fixedly connected to the inclined groove.

[0011] Preferably, the turbulence control assembly includes multiple sleeves fixedly connected to the top of the oil tank, and each of the multiple sleeves is slidably connected to a piston rod adapted thereto. The top of the piston rod is fixedly connected to a push block that abuts against the bottom of the flow-damping plate. The top of the flow-damping plate is constructed with a dust collection groove for storing impurities. A magnetic strip is fixedly connected inside the dust collection groove. The top of the push block is constructed with a protrusion that abuts against the magnetic strip.

[0012] Preferably, a plurality of sliding rods are slidably connected to one side of the oil tank, and an extrusion plate is fixedly connected to the plurality of sliding rods inside the oil tank. The extrusion plate is used to extrude oil in the oil tank. A plurality of transmission rods are slidably connected to the bottom of the water inlet pipe, and an inclined block is fixedly connected to the end of each of the plurality of sliding rods away from the extrusion plate. The bottom of the transmission rod is adapted to the top of the inclined block, and the top of the transmission rod abuts against one end of the crank.

[0013] Preferably, the discharge assembly includes a double-ended discharge rod slidably connected inside the liquid chamber, a discharge hole for discharging precipitant is provided on one side of the liquid chamber, one end of the double-ended discharge rod is adapted to the inside of the discharge hole, and a contact piece that can abut against one end of the double-ended discharge rod is fixedly connected to the top of the crank.

[0014] Preferably, one end of the connecting shaft is fixedly connected to a cam that can abut against one end of the crank, one side of the water inlet pipe is provided with multiple water inlets, and one end of each of the multiple diverter plates is fixedly connected to a spring that is fixedly connected to the partition plate.

[0015] Preferably, the inlet pipe is internally fixedly connected to multiple flow limiting plates, and multiple heaters are fixedly connected to one side of each of the multiple flow limiting plates.

[0016] Preferably, a drive motor is fixedly connected to one side of the water inlet pipe, and the output end of the drive motor extends into the interior of the water inlet pipe and is fixedly connected to multiple turbine blades.

[0017] Preferably, the electrode plate is internally fixedly connected with multiple fixing rods.

[0018] The present invention also provides a method for lithium extraction from salt lakes, comprising the following steps:

[0019] S1. When in use, the raw water is first poured into the inside of the inlet pipe and discharged from the outlet pipe through the membrane stack. The raw water will be filtered by the water filter assembly when it enters the inside of the inlet pipe.

[0020] S2. At the same time, when the water filtration component is running, it will drive the turbulence control component to run and change the tilt angle of the flow buffer plate, so that the flow buffer plate moves up and down continuously and changes the elevation angle of the raw water, so that the raw water forms turbulence and avoids its concentration polarization phenomenon.

[0021] S3. Subsequently, the discharge assembly operates so that when the raw water comes into contact with the diversion plate, the precipitant is discharged at the same time, mixes with the raw water, and enters the inlet.

[0022] S4. Raw water will pass through the membrane stack, and a DC electric field will be applied to both ends of the electrode plates to form an electric field force. Under the electric field force, anions in the water will migrate to the anode in the membrane stack, while cations will migrate to the cathode in the membrane stack. During the migration process, anions will enter the concentration chamber through the anion membrane in the membrane stack, while cations will enter another concentration chamber through the cation membrane in the membrane stack, thereby realizing the extraction of lithium.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] 1. The three-leaf filter screen can efficiently filter out impurities and particulate matter in the raw water, ensuring the cleanliness of the water entering the membrane stack and reducing the risk of membrane stack clogging. As the raw water flows, the three-leaf filter screen rotates continuously. The cleaning roller, under the action of the tension spring, adheres tightly to the surface of the filter screen, automatically cleaning the impurities attached to the filter screen, extending the service life of the filter screen and reducing the need for manual maintenance. The liquid chamber inside the diversion plate is used to store the precipitant. The discharge of the precipitant is precisely controlled by the discharge component. After mixing with the raw water, it effectively removes alkaline metal impurities such as calcium and magnesium, optimizing the water quality of the subsequent electrodialysis process. The discharge component achieves precise discharge of precipitant through the cooperation of the double-headed discharge rod and the discharge hole, as well as the interaction between the contact plate and the crank, avoiding the problems of over-discharge or under-discharge. The entire discharge process is automatically completed by the crank swing driven by the cam, without manual intervention, improving the automation level of the equipment. The diversion plate rotates under the drive of the crank, increasing the contact area with the raw water, promoting the full mixing of the raw water and the precipitant, and improving the sedimentation efficiency.

[0025] 2. The combination of the flow damper and the flow restrictor effectively slows down the flow velocity of raw water inside the inlet pipe, ensuring uniform water distribution and preventing concentration polarization caused by excessively high or low local flow velocities. This improves lithium-ion migration efficiency. The piston rod continuously moves the flow damper, achieving angle changes and further enhancing the self-mixing of the raw water, preventing the formation of a concentration polarization layer. Simultaneously, turbulence enhances fluid mixing, allowing ions to migrate to the membrane surface more quickly, improving electrodialysis efficiency. Magnetic strips in the dust collection tank adsorb impurities in the raw water, and the up-and-down movement of the pusher blocks scrapes off impurities from the magnetic strips, achieving a self-cleaning function and reducing the need for manual maintenance. The oil in the oil tank acts as a power source, evenly resisting the upward and downward movement of multiple piston rods, achieving stable driving force. With the continuous entry of raw water and the engagement of the crank, the turbulence control component operates automatically, improving convenience. Attached Figure Description

[0026] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0027] Figure 2 is a schematic diagram of the structure in this invention with multiple electrode plates removed;

[0028] Figure 3 is a schematic diagram of the structure of a single electrode plate in this invention;

[0029] Figure 4 is a schematic diagram of the water inlet pipe in this invention;

[0030] Figure 5 is a schematic cross-sectional view of the water inlet pipe in this invention;

[0031] Figure 6 is a partial cross-sectional view of the water inlet pipe in this invention;

[0032] Figure 7 is a schematic cross-sectional view of the sleeve in this invention;

[0033] Figure 8 is a schematic cross-sectional view of the oil pan in this invention;

[0034] Figure 9 is a schematic diagram of the crank structure in this invention;

[0035] Figure 10 is a schematic diagram of the cam structure in this invention;

[0036] Figure 11 is a schematic diagram of the structure of the liquid cavity in this invention.

[0037] In the diagram: 100, frame; 101, end plate; 102, electrode plate; 103, membrane stack; 104, fixing rod; 200, inlet pipe; 201, outlet pipe; 202, inlet; 203, drive motor; 204, turbine blade; 205, partition plate; 206, three-leaf filter; 207, cleaning roller; 208, tension spring; 300, flow damper; 301, flow restrictor; 302, heater; 303 304. Dust collection tank; 305. Oil shell; 306. Sleeve; 307. Piston rod; 308. Push block; 309. Magnetic strip; 310. Extrusion plate; 311. Slide rod; 312. Inclined block; 400. Transmission rod; 401. Diverter plate; 402. Cam; 403. Crank; 404. Coupling; 405. Discharge hole; 406. Double-ended discharge rod; 407. Liquid chamber; 408. Spring; 409. Contact plate. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Example 1: Referring to Figures 1, 2, and 3, this invention provides a technical solution: an electrodialysis device for lithium extraction from salt lakes, comprising a frame 100 and multiple electrode plates 102 disposed within it, with multiple membrane stacks 103 fixedly connected inside the electrode plates 102, and multiple fixing rods 104 fixedly connected inside the electrode plates 102. The membrane stacks 103 include: electrodes, typically including anodes and cathodes, which are connected to an external DC power supply via wires to form an electric field; ion exchange membranes, which are divided into anion exchange membranes and cation exchange membranes. These membranes have selective permeability to specific ions, i.e., only allowing anions or cations to pass through, while not allowing water molecules or other ions to pass through; ion exchange resins, which fill the desalination chamber, typically a mixture of sulfonic acid cation exchange resins and quaternary ammonium anion exchange resins, which can adsorb and exchange ions in the water; and partitions, which separate the desalination chamber and the concentrate chamber, forming a water flow channel and serving as a water distribution and collection mechanism. The partition is typically made of rigid polyvinyl chloride (PVC) board and has water distribution holes, water distribution channels, water collection tanks and water collection holes, a concentrate chamber and a desalination chamber. The concentrate chamber is used to collect the removed impurity ions, while the desalination chamber is the main site for ion exchange. The electrode plate 102 can be supplied with direct current to form an electric field.

[0040] Furthermore, referring to Figures 4, 5, and 6, the system also includes an inlet pipe 200, which is fixedly connected to the top of the electrode plate 102 and communicates with multiple membrane stacks 103. Multiple outlet pipes 201 communicating with the membrane stacks 103 are fixedly connected to the bottom of the electrode plate 102. A separator plate 205 for separating raw water is fixedly connected inside the inlet pipe 200. A water filtration assembly for pre-treating the raw water is disposed inside the inlet pipe 200. The water filtration assembly includes multiple three-leaf filter screens 206 disposed inside the inlet pipe 200, with one end of each three-leaf filter screen 206... Each component is fixedly connected to a connecting shaft 403 that is rotatably connected to the partition plate 205. Multiple inclined grooves are provided on one side of the partition plate 205, and cleaning rollers 207 that can slidably abut against the three-leaf filter screen 206 are slidably connected in each of the multiple inclined grooves. One end of the cleaning roller 207 is fixedly connected to a tension spring 208 that is fixedly connected to the inclined groove. By setting the three-leaf filter screen 206, impurities in the raw water can be filtered. At the same time, the three-leaf filter screen 206 can be pushed by the raw water, thereby continuously exchanging the blades to improve its filtration effect, thereby reducing impurities in the raw water and reducing the accumulation of impurities in the membrane stack 103.

[0041] Please refer to Figures 9, 10, and 11. The system also includes a diversion plate 400, which is rotatably connected to one side of the partition plate 205 to push the raw water. The internal structure of the diversion plate 400 has a liquid chamber 406 for storing precipitant. A crank 402 is rotatably connected to one side of the partition plate 205, and a discharge assembly adapted to the crank 402 is provided inside the liquid chamber 406. By setting the discharge assembly, an appropriate amount of precipitant can be discharged to mix with the raw water to remove alkaline metal impurities such as calcium and magnesium, thereby optimizing the subsequent electrodialysis process.

[0042] Furthermore, the discharge assembly includes a double-ended discharge rod 405 slidably connected inside the liquid chamber 406. A discharge hole 404 for discharging the precipitant is provided on one side of the liquid chamber 406. One end of the double-ended discharge rod 405 is fitted into the discharge hole 404. A contact piece 408 is fixedly connected to the top of the crank 402, which abuts against one end of the double-ended discharge rod 405. A cam 401 is fixedly connected to one end of the connecting shaft 403, which abuts against one end of the crank 402. Multiple inlets 202 are provided on one side of the water inlet pipe 200, and one end of each of the multiple diverter plates 400 is fixedly connected to a spring fixedly connected to the partition plate 205. 407. A liquid chamber 406 is provided to store precipitant. After the raw water enters the inlet pipe 200, the three-leaf filter 206 drives the cam 401 to rotate, which in turn continuously strikes the crank 402. This causes one end of the double-headed drain rod 405 to be misaligned with the drain hole 404, so that the liquid chamber 406 and the drain hole 404 are connected to discharge the precipitant, allowing it to mix with the raw water. At the same time, when the crank 402 swings, it also drives the diverter plate 400 to rotate together. At this time, the diverter plate 400 will increase the contact area with the raw water, thereby guiding the raw water to be discharged, while buffering the raw water to provide time for it to mix with the precipitant.

[0043] Specifically, when raw water enters the inlet pipe 200, it is guided by the partition plate 205 and pushed by the flow restrictor plate 301 to pass through the three-leaf filter screen 206, driving it to rotate. At the same time, the three-leaf filter screen 206 filters impurities in the raw water. As the three-leaf filter screen 206 moves, it pushes the cleaning roller 207 to move, thereby cleaning the outer surface of the three-leaf filter screen 206. Simultaneously, when the three-leaf filter screen 206 is pushed by the raw water, it drives the connecting shaft 403 to rotate, which in turn drives the cam 401 to rotate, causing the cam 401 to continuously strike one end of the crank 402. Before the raw water enters the inlet 202, it will be opposed by the diversion plate 400, which will divert the raw water so that some of the raw water will be opposed by the diversion plate and enter the inlet 202. At the same time, when one end of the crank 402 moves down, it will drive the contact plate 408 to move against one end of the double-headed drain rod 405, so that the double-headed drain rod 405 passes over the discharge hole 404 and opens the discharge hole 404, allowing the adsorbent in the liquid chamber 406 to be discharged. When the raw water is opposed by the diversion plate 400, the precipitant is discharged at the same time and mixed with the raw water to enter the inlet 202.

[0044] In summary, the tri-leaf filter 206 efficiently filters out impurities and particulate matter from the raw water, ensuring the cleanliness of the water entering the membrane stack and reducing the risk of membrane clogging. As the raw water flows, the tri-leaf filter rotates continuously, and the cleaning roller 207, under the action of the tension spring 208, adheres tightly to the filter surface, automatically cleaning impurities attached to the filter, extending its service life and reducing the need for manual maintenance. The liquid chamber 406 inside the diversion plate 400 stores the precipitant, and the discharge component precisely controls the precipitant's discharge, effectively removing alkaline metals such as calcium and magnesium after mixing with the raw water. The impurities are optimized, improving the water quality in the subsequent electrodialysis process. The discharge assembly, through the cooperation of the double-headed discharge rod 405 and the discharge hole 404, and the interaction between the contact plate 408 and the crank 402, achieves precise discharge of the precipitant, avoiding the problems of over-discharge or under-discharge. The entire discharge process is automatically completed by the cam 401 driving the crank 402 to swing, without manual intervention, improving the automation level of the equipment. The diverter plate 400 rotates under the drive of the crank 402, increasing the contact area with the raw water, promoting the full mixing of the raw water and the precipitant, and improving the sedimentation efficiency.

[0045] Example 2: Referring to Figures 6, 7, and 8, the present invention also provides a technical solution that differs from Example 1: an electrodialysis device for lithium extraction from salt lakes, further comprising a flow buffer plate 300, which is configured as multiple plates rotatably connected inside an inlet pipe 200 for buffering raw water. An oil tank 304 storing oil is fixedly connected to the bottom of the inlet pipe 200, and multiple turbulence-controlling components for adjusting the angle of the flow buffer plate 300 are provided on the top of the oil tank 304. Multiple flow restricting plates 301 are fixedly connected inside the inlet pipe 200. Multiple heaters 302 are fixedly connected to one side of the membrane. By setting the flow-slowing plate 300 and the flow-limiting plate 301 together, the flow speed of the raw water in the inlet pipe 200 can be slowed down, so that it moves slowly and ensures uniform distribution. This avoids concentration polarization caused by excessively high or low local flow velocities, improves lithium ion migration efficiency, and reduces energy consumption. The turbulence-controlling component can continuously change the angle of the flow-slowing plate 300, further improving the self-mixing of the raw water, thereby further avoiding the concentration polarization layer. At the same time, the turbulence enhances the mixing effect of the fluid, allowing ions to migrate to the membrane surface more quickly.

[0046] Furthermore, the turbulence control assembly includes multiple sleeves 305 fixedly connected to the top of the oil tank 304, and each sleeve 305 has a piston rod 306 slidably connected to its top. A pusher block 307 is fixedly connected to the top of the piston rod 306, abutting against the bottom of the flow-damping plate 300. The top of the flow-damping plate 300 has a dust collection groove 303 for storing impurities. A magnetic strip 308 is fixedly connected inside the dust collection groove 303. The top of the pusher block 307 has a protrusion that abuts against the magnetic strip 308. By setting... The piston rod 306 can push the flow plate 300 to move continuously, thereby changing the angle. At the same time, when the raw water is obstructed by the flow plate 300 and turbulence is generated, the impurity particles inside will separate from the raw water and fall onto the surface of the flow plate 300, where they will be attracted by the magnetic strip 308 in the dust collection tank 303. Meanwhile, the impurities scraped off by the cleaning roller 207 will also be disturbed by the raw water and enter the dust collection tank 303. When the push block 307 moves up and down, it will drive the protrusion on its top to scrape off the impurities attached to the magnetic strip 308.

[0047] The oil tank 304 has multiple sliding rods 310 slidably connected to one side, and an extrusion plate 309 fixedly connected to the multiple sliding rods 310 is provided inside the oil tank 304. The extrusion plate 309 is used to extrude the oil in the oil tank 304. Multiple transmission rods 312 are slidably connected to the bottom of the water inlet pipe 200, and an inclined block 311 is fixedly connected to the end of the multiple sliding rods 310 away from the extrusion plate 309. The bottom of the transmission rod 312 is adapted to the top of the inclined block 311, and the top of the transmission rod 312 abuts against one end of the crank 402. With the continuous entry of raw water and the cooperation of the crank 402, the turbulence control component can be automatically operated, improving convenience. The oil filling the oil tank 304 will serve as the power to evenly push the multiple piston rods 306 up and down, achieving a stable driving force.

[0048] Furthermore, a drive motor 203 is fixedly connected to one side of the water inlet pipe 200. The output end of the drive motor 203 extends into the interior of the water inlet pipe 200 and is fixedly connected to multiple turbine blades 204. The multiple turbine blades 204 can effectively drive the uniform flow of raw water and improve its efficiency in passing through the partition plate 205 and entering the other side of the water inlet pipe 200.

[0049] Specifically, the combination of the flow-slowing plate 300 and the flow-limiting plate 301 slows down the flow of raw water. Then, the drive motor 203 is turned on to drive multiple turbine blades 204 to rotate and apply rotational force to the raw water, causing heavy particles to sink along the wall. The cam 401 continuously strikes one end of the crank 402, thereby driving the transmission rod 312 to move down and squeeze the inclined block 311 to move horizontally, thereby pushing the extrusion plate 309 to move in the oil shell 304, and then squeezing the oil in the oil shell 304 so that it enters the sleeve 305 and squeezes the piston rod 306 to move up, thereby changing the tilt angle of the flow-slowing plate 300. This causes the flow-slowing plate 300 to move up and down continuously, changing the elevation angle of the raw water and making the raw water turbulent, thus avoiding concentration polarization.

[0050] In summary, the combination of the flow-slowing plate 300 and the flow-limiting plate 301 effectively slows down the flow velocity of raw water inside the inlet pipe 200, ensuring uniform water distribution and avoiding concentration polarization caused by excessively high or low local flow velocities. This improves lithium-ion migration efficiency. The piston rod 306 continuously moves the flow-slowing plate 300, achieving angle changes and further enhancing the self-mixing of the raw water, preventing the formation of a concentration polarization layer. Simultaneously, turbulence enhances fluid mixing, allowing ions to migrate to the membrane surface more quickly, improving electrodialysis efficiency. The magnetic strips in the dust collection tank 303 adsorb impurity particles in the raw water, while the pusher block 307 moves up and down, causing the protrusions to scrape off impurities from the magnetic strips, achieving a self-cleaning function and reducing the need for manual maintenance. The oil in the oil tank 304 serves as a power source, evenly contacting multiple piston rods 306 as they move up and down, achieving stable driving force. With the continuous entry of raw water and the cooperation of the crank 402, the turbulence-controlling component operates automatically, improving convenience.

[0051] Example 3: Referring to Figures 1 to 11, the present invention also provides a technical solution, which differs from Example 1 in that: a method for lithium extraction from salt lakes, comprising the following steps:

[0052] S1. When in use, the raw water is first poured into the inlet pipe 200 and discharged from the outlet pipe 201 through the membrane stack 103. When the raw water enters the inlet pipe 200, it will be guided by the partition plate 205 and pushed by the flow limiting plate 301 to pass through the three-leaf filter screen 206 and drive it to rotate. At the same time, the three-leaf filter screen 206 filters impurities in the raw water. When the three-leaf filter screen 206 moves, it will push the cleaning roller 207 to move, thereby cleaning the outer surface of the three-leaf filter screen 206. With the cooperation of the slow flow plate 300 and the flow limiting plate 301, the flow rate of the raw water can be slowed down.

[0053] S2. Then, the drive motor 203 is turned on to drive multiple turbine blades 204 to rotate and apply rotational force to the raw water, so that heavy particles sink along the wall and enter the other side of the inlet pipe 200 with the flow of raw water and are discharged through multiple inlets 202. At the same time, when the three-leaf filter screen 206 is pushed by the raw water, it will drive the connecting shaft 403 to rotate and drive the cam 401 to rotate. The cam 401 continuously hits one end of the crank 402, thereby driving the transmission rod 312 to move down and squeeze the inclined block 311 to move horizontally, thereby pushing the extrusion plate 309 to move in the oil shell 304, and then squeezing the oil in the oil shell 304 so that it enters the sleeve 305 and squeezes the piston rod 306 to move up, thereby changing the tilt angle of the flow plate 300. The flow plate 300 moves up and down continuously, changing the elevation angle of the raw water, making the raw water turbulent and avoiding its concentration polarization phenomenon.

[0054] S3. Before the raw water enters the inlet 202, it will be blocked by the diversion plate 400, which will divert the raw water so that some of the raw water will come into the inlet 202. At the same time, when one end of the crank 402 moves down, it will drive the contact plate 408 to move against one end of the double-headed drain rod 405, so that the double-headed drain rod 405 passes over the discharge hole 404 and opens the discharge hole 404, allowing the adsorbent in the liquid chamber 406 to be discharged. When the raw water comes into contact with the diversion plate 400, the precipitant will be discharged at the same time and mixed with the raw water to enter the inlet 202.

[0055] S4. After passing through the inlet 202, the raw water will pass through the membrane stack 103. At the same time, a DC electric field is applied to both ends of the electrode plate 102 to form an electric field force. Under the electric field force, the anions in the water will migrate to the anode in the membrane stack 103, while the cations will migrate to the cathode in the membrane stack 103. During the migration process, the anions will enter the concentration chamber through the anion membrane in the membrane stack 103, while the cations will enter another concentration chamber through the cation membrane in the membrane stack 103, thereby realizing the extraction of lithium.

[0056] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0057] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An electrodialysis device for lithium extraction from salt lakes, comprising a frame (100) and a plurality of electrode plates (102) disposed therein, wherein a plurality of membrane stacks (103) are fixedly connected inside the plurality of electrode plates (102), characterized in that, Also includes: The inlet pipe (200) is fixedly connected to the top of the electrode plate (102) and communicates with multiple membrane stacks (103). The bottom of the electrode plate (102) is fixedly connected to multiple outlet pipes (201) communicating with the membrane stacks (103). The inside of the inlet pipe (200) is fixedly connected to a separator plate (205) for separating raw water. The inside of the inlet pipe (200) is provided with a water filtration assembly for pre-treating the raw water. The flow buffer plate (300) is constructed in which multiple plates are rotatably connected inside the water inlet pipe (200) to buffer the raw water. The bottom of the water inlet pipe (200) is fixedly connected to an oil tank (304) containing oil, and the top of the oil tank (304) is provided with multiple turbulence control components for adjusting the angle of the flow buffer plate (300). A diverter plate (400) is rotatably connected to one side of a partition plate (205) for pushing raw water. The diverter plate (400) has an internal structure for storing a precipitant in a liquid chamber (406). A crank (402) is rotatably connected to one side of the partition plate (205), and a discharge assembly adapted to the crank (402) is provided inside the liquid chamber (406).

2. The electrodialysis device for lithium extraction from salt lakes according to claim 1, characterized in that: The water filtration assembly includes multiple three-leaf filter screens (206) disposed inside the water inlet pipe (200), and one end of each of the multiple three-leaf filter screens (206) is fixedly connected to a connecting shaft (403) that is rotatably connected to the partition plate (205). Multiple inclined grooves are provided on one side of the partition plate (205), and cleaning rollers (207) that can slidably contact the three-leaf filter screens (206) are slidably connected in each of the multiple inclined grooves. One end of the cleaning rollers (207) is fixedly connected to a tension spring (208) that is fixedly connected to the inclined groove.

3. The electrodialysis device for lithium extraction from salt lakes according to claim 2, characterized in that: The turbulence control assembly includes multiple sleeves (305) fixedly connected to the top of the oil tank (304), and each of the multiple sleeves (305) is slidably connected to a piston rod (306) adapted thereto. The top of the piston rod (306) is fixedly connected to a push block (307) that abuts against the bottom of the flow retardant plate (300). The top of the flow retardant plate (300) is constructed with a dust collection groove (303) for storing impurities. A magnetic strip (308) is fixedly connected inside the dust collection groove (303). The top of the push block (307) is constructed with a protrusion that abuts against the magnetic strip (308).

4. The electrodialysis apparatus for lithium extraction from salt lakes according to claim 3, characterized in that: A plurality of slide rods (310) are slidably connected to one side of the oil shell (304), and an extrusion plate (309) is fixedly connected to the plurality of slide rods (310) inside the oil shell (304). The extrusion plate (309) is used to extrude the oil in the oil shell (304). A plurality of transmission rods (312) are slidably connected to the bottom of the water inlet pipe (200), and an inclined block (311) is fixedly connected to one end of the plurality of slide rods (310) away from the extrusion plate (309). The bottom of the transmission rod (312) is adapted to the top of the inclined block (311), and the top of the transmission rod (312) abuts against one end of the crank (402).

5. An electrodialysis device for lithium extraction from salt lakes according to claim 2, characterized in that: The discharge assembly includes a double-ended discharge rod (405) slidably connected inside the liquid chamber (406). A discharge hole (404) for discharging precipitant is provided on one side of the liquid chamber (406). One end of the double-ended discharge rod (405) is adapted to the inside of the discharge hole (404). A contact piece (408) that can abut against one end of the double-ended discharge rod (405) is fixedly connected to the top of the crank (402).

6. An electrodialysis apparatus for lithium extraction from salt lakes according to claim 5, characterized in that: One end of the connecting shaft (403) is fixedly connected to a cam (401) that can abut against one end of the crank (402). A plurality of water inlets (202) are provided on one side of the water inlet pipe (200), and one end of each of the plurality of diverter plates (400) is fixedly connected to a spring (407) that is fixedly connected to the partition plate (205).

7. An electrodialysis apparatus for lithium extraction from salt lakes according to claim 3, characterized in that: The inlet pipe (200) is internally fixedly connected to multiple flow limiting plates (301), and multiple heaters (302) are fixedly connected to one side of each of the multiple flow limiting plates (301).

8. An electrodialysis apparatus for lithium extraction from salt lakes according to claim 1, characterized in that: A drive motor (203) is fixedly connected to one side of the water inlet pipe (200). The output end of the drive motor (203) extends into the interior of the water inlet pipe (200) and is fixedly connected to multiple turbine blades (204).

9. An electrodialysis apparatus for lithium extraction from salt lakes according to claim 1, characterized in that: The electrode plate (102) is internally fixedly connected with multiple fixing rods (104).

10. A method for lithium extraction from salt lakes, employing an electrodialysis apparatus for lithium extraction from salt lakes as described in any one of claims 1-9, characterized in that, It also includes the following steps: S1. When in use, the raw water is first poured into the inside of the inlet pipe (200) and discharged from the outlet pipe (201) through the membrane stack (103). The raw water will be filtered by the water filter assembly when it enters the inside of the inlet pipe (200). S2. At the same time, when the water filter component is running, it will drive the turbulence control component to run and change the tilt angle of the flow buffer plate (300), so that the flow buffer plate (300) moves up and down continuously and changes the elevation angle of the raw water, so that the raw water forms turbulence and avoids its concentration polarization phenomenon. S3. Subsequently, the discharge assembly operates so that when the raw water comes into contact with the diversion plate (400), the precipitant is discharged at the same time and mixed with the raw water to enter the inlet (202); S4. Raw water will pass through the membrane stack (103), and a DC electric field will be applied to both ends of the electrode plate (102) to form an electric field force. Under the electric field force, anions in the water will migrate to the anode in the membrane stack (103), while cations will migrate to the cathode in the membrane stack (103). During the migration process, anions will enter the concentration chamber through the anion membrane in the membrane stack (103), while cations will enter another concentration chamber through the cation membrane in the membrane stack (103), thereby realizing the extraction of lithium.

Images