Flow electrode lithium extraction device

Abstract

The utility model discloses a flowing electrode lithium extraction device, which comprises a reaction main body, the reaction main body comprises a plurality of polar plates and diaphragms, the plurality of polar plates are arranged along a first direction, each polar plate is respectively provided with a flowing groove and two inlets and outlets, the two inlets and outlets are respectively arranged in the vertical direction and are respectively communicated with the flowing groove, and the diaphragms are arranged between two adjacent polar plates and are respectively communicated with the flowing groove. The flowing groove faces the diaphragm opening; the self-flushing pipe is arranged on the lower side of the reaction main body and is provided with a plurality of first shunting ports, and the first shunting ports are arranged in one-to-one correspondence with the polar plates and are respectively communicated with the flowing grooves of the corresponding polar plates; and the multiple valves are arranged in one-to-one correspondence with the first flow dividing openings and used for opening or closing the corresponding first flow dividing openings. The problem that slurry particles are deposited and blocked can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium extraction equipment, in particular to a flow electrode lithium extraction device. Background Art

[0002] In the flow electrode electrochemical lithium deintercalation and intercalation technology, a cathode slurry is configured with iron phosphate particles + conductive carbon black particles + salt lake brine, and an anode slurry is configured with lithium iron phosphate particles + conductive carbon black particles + lithium-rich solution. The electrode plates are arranged in an alternating pattern of cathode - anode - cathode - anode. The cathode slurry is introduced into the cathode electrode plate, and the anode slurry is introduced into the anode electrode plate. At the same time, direct current is introduced through the electrode tabs of the electrode plates. Iron phosphate obtains an electron and adsorbs lithium ions from the salt lake brine to become lithium iron phosphate. Lithium iron phosphate loses an electron and releases lithium ions into the lithium-rich solution. After most of the cathode side is converted into lithium iron phosphate and most of the anode side is converted into iron phosphate, the cathode slurry and the anode slurry are pumped out, and the filter cake is filtered out. After the filter cake is crushed and finely ground, the iron phosphate particles are added back to the cathode electrode plate, and the lithium iron phosphate particles are added back to the anode electrode plate. The polarity of the power supply does not need to be reversed. The clear liquid obtained by filtering the cathode slurry is added back to the cathode electrode plate, and the slurry obtained by filtering the anode slurry is pumped back to the anode electrode plate, and the power is continued to be applied. After several such cycles, the lithium concentration in the lithium-rich solution becomes higher and higher. After the lithium concentration in the lithium-rich solution reaches a certain level, the lithium-rich solution is pumped out and filtered to obtain a clear liquid, that is, a clear liquid with a high lithium content is obtained for subsequent further lithium extraction.

[0003] However, in the prior art, the electrode plates applied in the flow electrode electrochemical lithium deintercalation and intercalation technology often become severely blocked after running for a period of time. The flow of the slurry in each reaction chamber is uneven, which easily causes the situation of particle deposition and blockage, affecting the stable operation of the system. Summary of the Utility Model

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a flow electrode lithium extraction device, which can solve the problem of particle deposition and blockage of the slurry.

[0005] The solution of the utility model to solve its technical problems is as follows:

[0006] A flow electrode lithium extraction device, comprising:

[0007] A reaction main body, including multiple electrode plates and diaphragms. The multiple electrode plates are arranged along a first direction. Each electrode plate is respectively provided with a flow groove and two inlets and outlets. The two inlets and outlets are respectively opened in the up and down directions and are respectively communicated with the flow groove. The diaphragm is arranged between two adjacent electrode plates, and the flow groove is arranged to open towards the diaphragm;

[0008] The self-flushing pipe is arranged on the lower side of the reaction main body. The self-flushing pipe is provided with a plurality of first shunt ports, and the first shunt ports are arranged corresponding to the electrode plates one by one and are respectively communicated with the flow grooves of the corresponding electrode plates.

[0009] A plurality of valves are arranged corresponding to the plurality of first shunt ports one by one and are used to open or close the corresponding first shunt ports.

[0010] The utility model has at least the following beneficial effects: during the process of lithium extraction, all valves are opened, and the slurry enters the flow grooves of each electrode plate from the self-flushing pipe. The cathode slurry and the anode slurry respectively enter the flow grooves on both sides of the diaphragm. After power-on, the cathode slurry and the anode slurry react to achieve lithium extraction; after the lithium extraction reaction for a period of time, some valves are closed, and only some valves are kept open, so that the slurry is concentrated and enters the flow grooves where the valves are open. The flow rate of the slurry increases, and the flow velocity of the slurry entering the flow grooves increases, which can flush the silt inside the flow grooves, thereby avoiding blockage. After the self-flushing of some flow grooves is completed, the valves corresponding to the flow grooves that have completed self-flushing are closed, and other valves are opened to perform self-flushing on the flow grooves corresponding to other valves, so as to avoid the situation of material siltation in the flow grooves of each electrode plate during the reaction process and ensure the stability of the operation of the flow electrode lithium extraction device.

[0011] As a further improvement of the above technical solution, the self-flushing pipe is provided with a first slurry port and a first clear water port. The first slurry port is used to provide slurry, and the first clear water port is used to drain water. The flow electrode lithium extraction device further includes:

[0012] The backwashing pipe is arranged on the upper side of the reaction main body and is provided with a plurality of second shunt ports. The second shunt ports are arranged corresponding to the electrode plates one by one and are respectively communicated with the flow grooves of the corresponding electrode plates. The backwashing pipe is provided with a second slurry port and a second clear water port. The second slurry port is used to discharge slurry, and the second clear water port is used to provide clear water.

[0013] After the lithium extraction is completed, all valves are opened, the first clear water port and the second clear water port are opened, the first slurry port and the second slurry port are closed, and clear water is injected into the flow grooves of each electrode plate through the backwashing pipe. The flow grooves are flushed with clear water, so as to realize the liquid-breaking clear water backwashing and avoid the situation of slurry siltation in the flow grooves.

[0014] As a further improvement of the above technical solution, the flow groove has a plurality of vertical sections and a plurality of arc sections. Adjacent two vertical sections are connected through the arc section, and the flow directions in adjacent two vertical sections are opposite. With such a setting, the utilization area of the electrode plate is large, the liquid flow in the flow groove is smooth, and the possibility of slurry blockage is further reduced.

[0015] As a further improvement of the above technical solution, a guiding ridge is provided in the flow channel. The guiding ridge is located in the arc section and is bent along the bending direction of the arc section. The guiding ridge divides the arc section into an outer ring flow channel and an inner ring flow channel, and the radius of the outer ring flow channel is greater than that of the inner ring flow channel. The function of the guiding ridge is to guide the slurry to turn, so that the slurry can reach a state of uniform flow velocity as much as possible when turning in the flow channel, avoid the generation of dead corners, and further avoid the situation of slurry accumulation.

[0016] As a further improvement of the above technical solution, ramp structures are respectively provided at the inlet end and the outlet end of the flow channel. One end of the ramp structure is connected to the wall of the flow channel, and the other end is inclined towards the middle of the corresponding inlet or outlet.

[0017] With such a setting, a downstream slope can be formed to guide the slurry to enter and exit the flow channel, reduce the flow resistance when the slurry enters and exits the flow channel, reduce flow dead corners, and avoid the accumulation of slurry particles at the inlet end and the outlet end of the flow channel due to being blocked when entering and exiting the flow channel.

[0018] As a further improvement of the above technical solution, the flow electrode lithium extraction device further includes:

[0019] A pressing assembly, including a linear pushing component, a push plate and a thrust frame. The push plate and the thrust frame are respectively located on both sides of the reaction body along the first direction. The linear pushing component is drivingly connected to the push plate to drive the push plate to approach or move away from the thrust frame.

[0020] The pressing assembly is used to press the reaction body to make the electrode plate fit with the diaphragm, and avoid the leakage of slurry from the gap between the electrode plate and the diaphragm during the operation of the flow electrode lithium extraction device.

[0021] As a further improvement of the above technical solution, the flow electrode lithium extraction device further includes:

[0022] Two end plates are respectively arranged at both ends of the reaction body along the first direction and are connected to the electrode plates at both ends of the reaction body. Multiple connection holes are respectively provided on the two end plates;

[0023] A loosening prevention assembly, including a connecting screw and a connecting nut. The connecting screw passes through the corresponding connection holes of the two end plates, and the connecting nut is locked at both ends of the connecting screw along the first direction and abuts against the end plates.

[0024] During the pressing action, the push plate and the thrust frame respectively contact the end plates at both ends of the reaction body and will not directly contact the electrode plates, so that the electrode plates can be well protected; moreover, the setting of the loosening prevention assembly can further ensure the pressing effect and avoid the leakage of slurry from the gap between the diaphragm and the electrode plate.

[0025] As a further improvement of the above technical solution, the flow electrode lithium extraction device further includes:

[0026] An isolation pad, one side of the isolation pad is connected to the end plate, and the other side is connected to the electrode plate.

[0027] The isolation pad is used to isolate the high-salt exudate of the electrode plate to prevent corrosion of the end plate; at the same time, the isolation pad can buffer the pressing force transmitted from the end plate to the electrode plate, avoiding hard contact between the end plate and the electrode plate and generating excessive local stress.

[0028] As a further improvement of the above technical solution, the flow electrode lithium extraction device further includes:

[0029] An anti-falling rod, the anti-falling rod penetrates through the two end plates and is arranged on the lower side of the reaction body, and the anti-falling rod abuts against the lower end of the electrode plate.

[0030] The anti-falling rod can provide a supporting force for the electrode plate to prevent the electrode plate from falling, which is convenient for the installation of the electrode plate.

[0031] As a further improvement of the above technical solution, the end plate is provided with a lifting lug, the lifting lug extends along a second direction, the second direction is perpendicular to the first direction and the up-down direction, the lifting lug is provided with an operation hole, and the operation hole penetrates through the two side walls of the lifting lug along the first direction. Workers can reach into the operation hole by hand or manipulator, which is convenient for lifting the end plate and the reaction body.

[0032] As a further improvement of the above technical solution, the electrode plate is further provided with a sealing groove, the sealing groove is arranged along the edge of the electrode plate, and a sealing material is arranged in the sealing groove, and the sealing material is used to seal the electrode plate and the diaphragm.

[0033] Setting the sealing groove and the sealing material can further seal the electrode plate and the diaphragm, and the electrode plate and the diaphragm can reach a completely fitting state, avoiding the short circuit caused by the slurry flowing to the place outside the flow groove of the electrode plate through the gap between the diaphragm and the electrode plate.

[0034] As a further improvement of the above technical solution, the reaction body further includes pole lugs, there are a plurality of pole lugs, the pole lugs are arranged corresponding to the electrode plates one by one, and the pole lugs are detachably connected to the electrode plates. The detachable connection between the pole lugs and the electrode plates means that the plate parts used to make the electrode plates do not need to be cut to form pole lugs, which can reduce the width of the whole plate part used to make the electrode plates and the cost is lower. Description of the Drawings

[0035] To more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly describe the drawings required for use in the description of the embodiments. Obviously, the described drawings are only a part of the embodiments of the present utility model, rather than all the embodiments. Those skilled in the art can also obtain other design solutions and drawings based on these drawings without creative efforts.

[0036] Figure 1 is the overall structural schematic diagram of the flowing electrode lithium extraction device according to the embodiment of the present utility model;

[0037] Figure 2 is the structural schematic diagram of the flowing electrode lithium extraction device after removing the pressing assembly according to the embodiment of the present utility model;

[0038] Figure 3 is the structural schematic diagram of the flowing electrode lithium extraction device after removing the pressing assembly from another angle according to the embodiment of the present utility model;

[0039] Figure 4 is the structural schematic diagram of the self-flushing pipe of the flowing electrode lithium extraction device according to the embodiment of the present utility model;

[0040] Figure 5 is the structural schematic diagram of the backwashing pipe of the flowing electrode lithium extraction device according to the embodiment of the present utility model;

[0041] Figure 6 is the installation schematic diagram of the reaction main body of the flowing electrode lithium extraction device according to the embodiment of the present utility model;

[0042] Figure 7 is Figure 6 the enlarged structural schematic diagram of part A in

[0043] Figure 8 is the structural schematic diagram of the electrode plate of the flowing electrode lithium extraction device according to the embodiment of the present utility model;

[0044] Figure 9 is the left view of the electrode plate of the flowing electrode lithium extraction device according to the embodiment of the present utility model;

[0045] Figure 10 is the structural schematic diagram of the end plate of the flowing electrode lithium extraction device according to the embodiment of the present utility model;

[0046] Figure 11 is the structural schematic diagram of the pressing assembly of the flowing electrode lithium extraction device according to the embodiment of the present utility model.

[0047] Reference numerals:

[0048] 100, Reaction body; 110, Plate electrode; 111, Flow channel; 112, Inlet and outlet; 113, Vertical section; 114, Arc section; 115, Flow guiding ridge; 116, Slope structure; 117, Sealing groove; 120, Diaphragm; 130, Tab

[0049] 200, Self-flushing pipe; 210, First shunt port; 220, First slurry port; 230, First clear water port

[0050] 300, Valve

[0051] 400, Backwashing pipe; 410, Second shunt port; 420, Second slurry port; 430, Second clear water port

[0052] 500, Compression assembly; 510, Linear pushing component; 520, Pushing plate; 530, Thrust frame; 540, Frame

[0053] 600, End plate; 610, Lifting ear; 620, Operation hole

[0054] 700, Anti-loosening assembly; 710, Connecting screw; 720, Connecting nut

[0055] 800, Isolation pad

[0056] 900, Anti-falling rod Detailed implementation manners

[0057] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model, and should not be construed as a limitation to the present utility model.

[0058] In the description of the present utility model, the orientation descriptions such as up, down, front, back, left, right, etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0059] In the description of the present utility model, the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, exceeding, etc. are understood as not including the present number, above, below, within, etc. are understood as including the present number. If the first and second are described, it is only for the purpose of distinguishing technical features and should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0060] In the description of the present utility model, unless otherwise clearly defined, terms such as "arrangement", "installation", "connection", etc. should be understood in a broad sense, and those skilled in the relevant technical field can reasonably determine the specific meanings of the above terms in the present utility model in combination with the specific content of the technical solution.

[0061] Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, other embodiments obtained by those skilled in the art without creative efforts all fall within the scope of protection of the present utility model. Each technical feature in the present utility model can be combined interactively on the premise of not conflicting with each other.

[0062] The electrochemically-driven lithium extraction technology belongs to an emerging technical field, and the technology is not yet mature, with few available devices for reference. Currently, it mainly focuses on electrochemically-driven extraction devices in the form of electrode coating, that is, coating iron phosphate on the cathode electrode and lithium iron phosphate on the anode electrode. Under the drive of an externally applied current, iron phosphate on the cathode side obtains an electron and simultaneously adsorbs lithium ions from the salt lake to become lithium iron phosphate. On the anode side, lithium iron phosphate loses an electron and simultaneously releases lithium ions into the lithium-rich solution, which is initially pure water. After most of the iron phosphate on the cathode side is converted into lithium iron phosphate and most of the lithium iron phosphate on the anode side is converted into iron phosphate, the polarity of the power supply is reversed, and at the same time, the salt lake water and the lithium-rich solution are pumped out and exchanged. The iron phosphate generated in the previous process continues to absorb lithium from the salt lake water, and lithium iron phosphate continues to release lithium into the lithium-rich solution. After repeating this cycle several times, the lithium concentration in the lithium-rich solution becomes higher and higher.

[0063] There are also magnesium ions and sodium ions in the salt lake. Magnesium ions are divalent and do not react with iron phosphate. Sodium ions have a relatively large radius and are difficult to enter the lattice gaps of iron phosphate. Therefore, magnesium and sodium are rarely adsorbed by iron phosphate, and only lithium ions are adsorbed in large quantities. To complete the conduction of the current, the cathode electrode and the anode electrode are separated by a monovalent anion exchange membrane. For each lithium ion adsorbed by the cathode iron phosphate, one chloride ion passes through the anion exchange membrane from the cathode to the anode and combines with the lithium ions released from the lithium iron phosphate in the anode lithium-rich solution to form electrically neutral lithium chloride. Therefore, the lithium-rich solution is a relatively pure lithium chloride solution. After the lithium chloride content in the lithium-rich solution reaches a certain level, the lithium-rich solution is taken out, thus achieving the purpose of extracting lithium from the salt lake.

[0064] Coating materials on the electrode cannot be too thick, otherwise lithium ions cannot enter deep into the electrode, reducing the lithium absorption capacity of the coating material. The coating material only contacts the salt lake water on the surface of the electrode, with a small adsorption area and low lithium extraction efficiency. The electrode is not easy to disassemble and install. Once the coating material is damaged or fails, the entire device needs to be disassembled, the electrode taken out, and the material scraped off and re-coated, which is very cumbersome.

[0065] Quite different from the form of electrode coating, lithium extraction is carried out by the flow cell electrochemical (FCDI) technology for lithium insertion and extraction, which is the focus of the research in the embodiments of the present utility model. A cathode slurry is configured with iron phosphate particles + conductive carbon black particles + salt lake brine, and an anode slurry is configured with lithium iron phosphate particles + conductive carbon black particles + lithium-rich solution. The lithium extraction material is not coated on the electrode plate, but is dissolved in water in the form of powder to form a slurry, and the slurry is made to flow in the flow channels provided on the electrode plate. During operation, the electrode plates are arranged in an alternating pattern of cathode - anode - cathode - anode. The cathode slurry is introduced into the cathode electrode plate, and the anode slurry is introduced into the anode electrode plate. At the same time, direct current is introduced through the tabs of the electrode plates. The current is transferred to the slurry. The iron phosphate in the cathode slurry obtains an electron and adsorbs lithium ions from the salt lake brine to become lithium iron phosphate, while the lithium iron phosphate in the anode slurry loses an electron and releases lithium ions into the lithium-rich solution. After most of the iron phosphate on one side of the cathode electrode plate is converted into lithium iron phosphate and most of the lithium iron phosphate on one side of the anode electrode plate is converted into iron phosphate, the cathode slurry and the anode slurry are pumped out, and the mud cake is filtered out by pressure filtration. After the mud cake is crushed and finely ground, the iron phosphate particles are re-added to the cathode electrode plate, and the lithium iron phosphate particles are re-added to the anode electrode plate. Throughout the process, the polarity of the power supply does not need to be reversed. The clear liquid obtained by filtering the cathode slurry is added back to the cathode electrode plate, and the slurry obtained by filtering the anode is added back to the anode electrode plate, and power is continued to be supplied. After repeating this cycle several times, the lithium concentration in the lithium-rich solution becomes higher and higher. When the lithium concentration in the lithium-rich solution is high enough (generally 6 g / L), the lithium-rich solution is pumped out and pressure-filtered to obtain a clear liquid with a high lithium content for further lithium extraction in the subsequent process.

[0066] However, in the prior art, the electrode plates applied in the flow cell electrochemical technology for lithium insertion and extraction often become severely blocked after running for a period of time. The flow of the slurry in each reaction chamber is uneven, which easily causes the situation of particle deposition and blockage, affecting the stable operation of the system. The embodiments of the present utility model mainly aim at the above problems and propose a flow cell lithium extraction device with a flushing function, which can avoid the situation of particle deposition and blockage in the slurry.

[0067] Referring to Figure 1 、 Figure 2 、 Figure 3 、 Figure 6 and Figure 7 The flow cell lithium extraction device of the embodiments of the present utility model includes a reaction body 100, a self-flushing pipe 200, and a valve 300, which can perform on-line liquid-carrying self-flushing and can effectively avoid the problem of slurry deposition.

[0068] Among them, the reaction body 100 includes a plurality of electrode plates 110, and the electrode plates 110 are arranged along the first direction. Referring to Figure 8 and Figure 9, each electrode plate 110 is respectively provided with a flow channel 111 and two inlets and outlets 112. The two inlets and outlets 112 are respectively opened in the up and down directions and are respectively communicated with the flow channel 111. The self-flushing pipe 200 is arranged on the lower side of the reaction main body 100 and extends along the first direction, and can supply slurry to the flow channel 111 of the electrode plate 110. Refer to Figure 4 , the self-flushing pipe 200 is provided with a plurality of first shunt ports 210. The first shunt ports 210 are arranged in one-to-one correspondence with the electrode plates 110 and are respectively communicated with the flow channels 111 of the corresponding electrode plates 110. A plurality of valves 300 are provided. The plurality of valves 300 are arranged in one-to-one correspondence with the first shunt ports 210, and the valves 300 can control the opening or closing of the corresponding first shunt ports 210.

[0069] In this embodiment, the electrode plate 110 is a graphite plate, which is divided into a cathode electrode plate 110 and an anode electrode plate 110. The cathode electrode plate 110 and the anode electrode plate 110 are arranged at intervals along the first direction. The reaction main body 100 further includes a diaphragm 120. The diaphragm 120 is arranged between the adjacent cathode electrode plate 110 and anode electrode plate 110. It can be understood that both the cathode electrode plate 110 and the anode electrode plate 110 are provided with flow channels 111. The flow channels 111 are arranged to open towards the diaphragm 120. The flow channel 111 of the cathode electrode plate 110 is used to introduce cathode slurry, and the flow channel 111 of the anode electrode plate 110 is used to introduce anode slurry. The diaphragm 120 and the flow channels 111 of the adjacent cathode electrode plate 110 and anode electrode plate 110 together form a reaction structure. The cathode slurry and the anode slurry can undergo an electrolysis reaction when an electric current is applied, achieving the effect of lithium extraction.

[0070] It can be understood that each cathode electrode plate 110 and each anode electrode plate 110 have two inlets and outlets 112. The inlets and outlets 112 are respectively communicated with the flow channel 111, and are respectively an upper inlet and outlet 112 and a lower inlet and outlet 112. The upper inlet and outlet 112 is opened upwards, and the lower inlet and outlet 112 is opened downwards. Slurry or clean water can enter the corresponding flow channel 111 through one of the inlets and outlets 112 to wash the inside of the flow channel 111 or undergo an electrolysis reaction in the flow channel 111.

[0071] For the convenience of description, the left and right directions are used as the first direction. In this embodiment, the cathode electrode plates 110 are arranged at intervals along the left and right directions.

[0072] In this embodiment, the electrode plates 110 at the left and right ends are single-sided electrode plates 110, with flow channels 111 provided on only one side, while the electrode plates 110 in the middle are all double-sided electrode plates 110, and flow channels 111 are respectively provided on the left and right sides of each double-sided electrode plate 110. In the double-sided electrode plate 110, the flow channels 111 on the left and right sides are both communicated with the same upper inlet / outlet 112 and the same lower inlet / outlet 112. With such a setting, the number of electrode plates 110 can be reduced, and the number of reaction structures can be increased, thereby improving the lithium extraction efficiency.

[0073] There are two self-flushing pipes 200, and both of the two self-flushing pipes 200 are arranged on the lower side of the reaction body 100. Moreover, both of the two self-flushing pipes 200 extend along the left-right direction. One of the self-flushing pipes 200 is connected to the cathode electrode plate 110 and can supply cathode slurry to the flow channel 111 of the cathode electrode plate 110, and the other self-flushing pipe 200 is connected to the anode electrode plate 110 and can supply anode slurry to the flow channel 111 of the anode electrode plate 110. Each self-flushing pipe 200 is respectively provided with a plurality of first shunt ports 210, and the first shunt ports 210 on the same self-flushing pipe 200 are arranged along the left-right direction. The first shunt ports 210 of one of the self-flushing pipes 200 are communicated with the lower inlet / outlet 112 of the cathode electrode plate 110, and the first shunt ports 210 of this self-flushing pipe 200 are arranged in one-to-one correspondence with the cathode electrode plate 110. The first shunt ports 210 of the other self-flushing pipe 200 are communicated with the lower inlet / outlet 112 of the anode electrode plate 110, and the first shunt ports 210 of this self-flushing pipe 200 are arranged in one-to-one correspondence with the anode electrode plate 110.

[0074] When lithium is extracted using the flow electrode lithium extraction device of this embodiment, open each valve 300, let the cathode slurry enter the flow channel 111 of the cathode electrode plate 110 through the self-flushing pipe 200, and let the anode slurry enter the flow channel 111 of the anode electrode plate 110 through the other self-flushing pipe 200. After passing an electric current, the cathode slurry and the anode slurry undergo an electrolysis reaction through the diaphragm 120. The iron phosphate in the cathode slurry obtains an electron and simultaneously adsorbs lithium ions from the salt lake brine to become lithium iron phosphate, and the lithium iron phosphate in the anode slurry loses an electron and simultaneously releases lithium ions into the lithium-rich liquid. The reacted cathode slurry flows out through the second slurry port 420 of the backwashing pipe 400, and the reacted anode slurry flows out through the second slurry port 420 of the other backwashing pipe 400.

[0075] After the lithium extraction reaction is carried out for a period of time, the mobile electrode lithium extraction device of this embodiment can be used for online liquid self-flushing, that is, the flow tank 111 is flushed with slurry. Specifically, in each self-flushing pipe 200, some valves 300 are closed. Since the speed of the material pump providing the slurry remains unchanged, the slurry is concentrated at the first diversion port 210 where the valve 300 is opened, and enters the corresponding flow tank 111. The slurry flow rate of the first diversion port 210 where the corresponding valve 300 is in the open state increases, and the slurry flow rate in the corresponding flow tank 111 increases, which can flush away the siltation inside the corresponding flow tank 111 to avoid blockage.

[0076] It can be understood that after completing the self-flushing of some flow slots 111, the valve 300 corresponding to the flow slot 111 that has completed the self-flushing is closed, and the valve 300 corresponding to the other flow slots 111 is opened, so that the other flow slots 111 can be self-flushed.

[0077] In some embodiments, the inlet and outlet 112 are threaded holes, and the inlet and outlet ends of the valve 300 are both pagoda heads. A threaded-to-pagoda adapter can be used to convert the threaded hole into a pagoda head, and then one end of the hose is inserted into the pagoda head of the adapter, and the other end of the hose is connected to the pagoda head of the valve 300, and the valve 300 is then connected to the self-flushing pipe 200.

[0078] It is understandable that the valve 300 can be electric or manual. In the present embodiment, the valve 300 is an electric ball valve, which can be controlled to open or close by the control program of the controller to reduce the mistakes of manual operation and reduce the labor cost. When self-flushing, all the electric ball valves are controlled to open first. After running for a period of time, a part of the electric ball valves are automatically controlled to remain open, while the other electric ball valves are closed, and the flow groove 111 corresponding to the opened electric ball valve is self-flushed. After the flow groove 111 of this part is self-flushed for a period of time, another part of the electric ball valves is automatically controlled to open, and the other electric ball valves are controlled to close, and the flow groove 111 corresponding to the opened electric ball valve is self-flushed. After all the flow grooves 111 are self-flushed once, all the electric ball valves are automatically controlled to open, and lithium extraction is continued. After the lithium extraction is run for a period of time, the above self-flushing steps are repeated, and the online liquid self-flushing of the plate 110 can be automatically realized, and the slurry accumulation in the flow groove 111 can be reduced.

[0079] In this embodiment, 13 cathode plates 110 and 13 anode plates 110 are provided. Correspondingly, 26 electric ball valves are provided. Among them, 13 electric ball valves are connected to the cathode plates 110 and are connected to one of the self-flushing pipes 200, and the other 13 electric ball valves are connected to the anode plates 110 and are connected to the other self-flushing pipe 200. In this embodiment, the 13 electric ball valves connected to the cathode plates 110 are divided into 3 groups. The 3 groups of electric ball valves respectively include 4 electric ball valves, 5 electric ball valves and 4 electric ball valves, and the 3 groups of electric ball valves are arranged in the left-right direction; the 13 electric ball valves connected to the anode plates 110 are divided into 3 groups. The 3 groups of electric ball valves respectively include 4 electric ball valves, 5 electric ball valves and 4 electric ball valves, and the 3 groups of electric ball valves are arranged in the left-right direction.

[0080] The specific control process is as follows: First, open all the electric ball valves to allow the slurry to enter each flow tank 111 for lithium extraction reaction and run for 1 hour; keep the electric ball valves of the left group connected to the cathode plates 110 and the electric ball valves of the left group connected to the anode plates 110 open, close the other electric ball valves, keep the speed of the feed pump unchanged, and continue to supply the slurry to the flow tanks 111 corresponding to the opened electric ball valves. The slurry flushes this part of the flow tanks 111 for 3 minutes; open the electric ball valves of the middle group connected to the cathode plates 110 and the electric ball valves of the middle group connected to the anode plates 110, close the other electric ball valves, and the slurry flushes the flow tanks 111 corresponding to the opened electric ball valves for 3 minutes; open the electric ball valves of the right group connected to the cathode plates 110 and the electric ball valves of the right group connected to the anode plates 110, close the other electric ball valves, and the slurry flushes the flow tanks 111 corresponding to the opened electric ball valves for 3 minutes. At this time, all the flow tanks 111 of the plates 110 are self-flushed once. Control all the electric ball valves to open and repeat all the above steps.

[0081] It can be understood that the opening or closing duration of each group of electric ball valves can be adjusted according to the actual situation.

[0082] In some embodiments, referring to Figure 4 , the self-flushing pipe 200 is provided with a first slurry port 220 for feeding and a first clear water port 230 for draining. The flow electrode lithium extraction device further includes a backwashing pipe 400. Referring to Figure 5 , the backwashing pipe 400 is provided with a second slurry port 420 for discharging the slurry and a second clear water port 430 for supplying clear water. The backwashing pipe 400 is arranged on the upper side of the reaction main body 100 and is provided with a plurality of second diversion ports 410. The second diversion ports 410 are arranged in one-to-one correspondence with the plates 110 and are respectively communicated with the flow tanks 111 of the corresponding plates 110.

[0083] In this embodiment, the two ends of the self-flushing pipe 200 in the left-right direction are respectively a first slurry port 220 and a first clear water port 230. The first slurry port 220 is used to connect to an external slurry supply component, and the first clear water port 230 is used to connect to an external clear water recovery component. There are two backwashing pipes 400, both of which are arranged on the upper side of the reaction main body 100, and both of the two backwashing pipes 400 extend in the left-right direction. One of the backwashing pipes 400 is connected to the cathode plate 110 and can supply water to the flow groove 111 of the cathode plate 110, and the other backwashing pipe 400 is connected to the anode plate 110 and can supply water to the flow groove 111 of the anode plate 110.

[0084] In this embodiment, the two ends of the backwashing pipe 400 in the left-right direction are respectively a second slurry port 420 and a second clear water port 430. The second slurry port 420 is used to connect to an external slurry recovery component, and the second clear water port 430 is used to connect to an external water supply device. Each backwashing pipe 400 is respectively provided with a plurality of second diversion ports 410, and the second diversion ports 410 on the same backwashing pipe 400 are arranged in the left-right direction. The second diversion ports 410 of one of the backwashing pipes 400 communicate with the upper inlet / outlet 112 of the cathode plate 110, and the second diversion ports 410 of this backwashing pipe 400 are arranged in one-to-one correspondence with the cathode plate 110. The second diversion ports 410 of the other backwashing pipe 400 communicate with the upper inlet / outlet 112 of the anode plate 110, and the second diversion ports 410 of this backwashing pipe 400 are arranged in one-to-one correspondence with the anode plate 110.

[0085] After the lithium extraction reaction is completed, close the first slurry port 220 of the self-flushing pipe 200 and the second slurry port 420 of the backwashing pipe 400, and keep the first clear water port 230 and the second clear water port 430 open. Keep all the valves 300 in the open state, and supply clear water to each flow groove 111 through the backwashing pipe 400, so as to perform liquid-breaking clear water backwashing on each flow groove 111, and further avoid the situation of blockage in the flow groove 111.

[0086] It can be understood that after the backwashing is completed, open the first slurry port 220 and the second slurry port 420 to drain the liquid material.

[0087] In this embodiment, through the above online in-band self-flushing and liquid-breaking clear water backwashing, a double flushing effect can be achieved, which can effectively avoid the situation of slurry accumulation and avoid blockage of the flow groove 111, thereby affecting the normal operation of the flow electrode lithium extraction device.

[0088] In this embodiment, the valve 300 is an electric ball valve, which can automatically control opening or closing. Electric ball valves are also respectively provided at the first clear water port 230, the second clear water port 430, the first slurry port 220, and the second slurry port 420. After the lithium extraction reaction (about 8 hours) is completed, all the valves 300 are automatically controlled to open, the first clear water port 230 and the second clear water port 430 are opened, the first slurry port 220 and the second slurry port 420 are closed, and clear water is introduced into each flow tank 111 for flushing for 10 minutes. Then, the electric ball valves at the first clear water port 230, the second clear water port 430, the first slurry port 220, and the second slurry port 420 are controlled to open, and the backwashing of the electrode plate 110 can be completed.

[0089] It can be understood that the duration of the backwashing can be adjusted according to the actual situation. In this embodiment, after the entire flushing process is programmed by the PLC, the opening and closing of each electric ball valve are automatically controlled, without manual operation.

[0090] In this embodiment, the self-flushing pipe 200 and the backwashing pipe 400 have similar structures, both of which are connected by a plurality of tees. The plurality of tees are arranged in the left-right direction, specifically 13 tees are connected. Flanges are respectively provided at both ends of the self-flushing pipe 200 and the backwashing pipe 400 in the left-right direction, that is, flanges are respectively provided at the first clear water port 230, the first slurry port 220, the second clear water port 430, and the second slurry port 420, so as to facilitate connection with external devices.

[0091] In the self-flushing pipe 200, adapters such as straight-through to flare adapters can be installed at the joints where each tee is used to connect the valve 300 to adapt to the connection of other components. In this embodiment, the materials of the self-flushing pipe 200 and the backwashing pipe 400 are both unplasticized polyvinyl chloride (UPVC), which has good corrosion resistance, small fluid resistance, can avoid slurry blockage, is light in texture and high in strength, is conducive to installation and construction, and the tees are connected to each other and the tees are connected to the flanges by bonding, with good water tightness, high bonding strength, and not easy to age.

[0092] Refer to Figure 8 and Figure 9 , in some embodiments, the flow tanks 111 of the electrode plate 110 are all serpentine, including a plurality of vertical segments 113 and a plurality of arc segments 114. A serpentine flow tank 111 is jointly formed by the plurality of vertical segments 113 and the plurality of arc segments 114. Each vertical segment 113 extends in the up-down direction, and adjacent two vertical segments 113 are connected by an arc segment 114, and the liquid flow directions in adjacent two vertical segments 113 are opposite.

[0093] It can be understood that with such a setting, the utilization area of the electrode plate 110 is large, the liquid in the flow channel 111 flows smoothly, and the possibility of slurry blockage is further reduced.

[0094] In some embodiments, a flow guiding ridge 115 is provided in each arc segment 114. The flow guiding ridge 115 is bent along the bending direction of the arc segment 114. The flow guiding ridge 115 divides the arc segment 114 into an outer ring flow channel and an inner ring flow channel, and the radius of the outer ring flow channel is greater than that of the inner ring flow channel.

[0095] It can be understood that the function of the flow guiding ridge 115 is to guide the slurry to turn, so that the slurry can reach a state of uniform flow velocity as much as possible when turning. If the flow guiding ridge 115 is not provided, due to the action of inertia, during the process of the slurry flowing along the arc segment 114, the slurry will be thrown out towards the outer circumference of the arc segment 114, resulting in a situation where the flow velocity of the slurry in the inner ring flow channel is low and the flow velocity of the slurry in the outer ring flow channel is high. The overall flow velocity of the slurry is uneven, and the flow velocity in the inner ring flow channel is low, which is prone to dead corners, and it is easy for slurry particles to accumulate and block the flow channel 111.

[0096] After the flow guiding ridge 115 is provided, the slurry in the inner ring flow channel is blocked by the flow guiding ridge 115. The flow guiding ridge 115 guides the slurry inside the arc segment 114 to turn a small bend, that is, to keep flowing in the inner ring flow channel and not to be thrown into the outer ring flow channel under the action of inertia, making the flow velocity of the slurry uniform, avoiding the generation of dead corners, and further avoiding the situation of slurry accumulation.

[0097] It can be understood that the inlet end and the outlet end of the flow channel 111 are respectively oriented towards an inlet and outlet 112. In some embodiments, slope structures 116 are respectively provided at the inlet end and the outlet end of the flow channel 111. One end of the slope structure 116 is connected to the wall of the flow channel 111, and the other end extends obliquely towards the middle of the corresponding inlet and outlet 112.

[0098] It can be understood that with such a setting, a downstream slope can be formed to guide the slurry to enter and exit the flow channel 111, reduce the flow resistance when the slurry enters and exits the flow channel 111, reduce flow dead corners, and avoid the accumulation of slurry particles at the inlet end and the outlet end of the flow channel 111 due to being blocked when entering and exiting the flow channel 111.

[0099] In this embodiment, the flow channels 111 of adjacent electrode plates 110 are completely aligned. During the subsequent process of pressing the electrode plates 110, the walls of the flow channels 111 on the opposite faces of the adjacent electrode plates 110 are aligned, and the separator 120 can be pressed tightly to prevent the separator 120 from shaking and dislocating under the condition of slurry flow and slurry pressure.

[0100] It can be understood that the electrode plate 110 of the flowing electrode lithium extraction device needs to be pressed tightly so that the electrode plate 110 fits with the separator 120 to prevent the slurry from leaking out through the gap between the electrode plate 110 and the separator 120 during operation. In some embodiments, the flowing electrode lithium extraction device further includes a pressing assembly 500 for pressing the reaction body 100.

[0101] Referring Figure 11 , in this embodiment, the pressing assembly 500 includes a linear driving member 510, a push plate 520 and a thrust frame 530. The output end of the linear driving member 510 is connected to the push plate 520 and can provide a thrust for the push plate 520.

[0102] In this embodiment, the linear driving member 510 is a hydraulic cylinder. The push plate 520 and the thrust frame 530 are respectively located at the left and right ends of the reaction body 100. The reaction body 100 is pressed through the hydraulic cylinder. During the pressing process, the hydraulic cylinder is started, and the thrust provided by the hydraulic cylinder pushes the push plate 520 to move. The push plate 520 pushes the reaction body 100, and the entire reaction body 100 starts to move and approaches the thrust frame 530. After the reaction body 100 contacts the thrust frame 530, the hydraulic cylinder continues to push the push plate 520 and drives the reaction body 100 to start pressing. It can be understood that before performing the pressing action, the pressing force of the reaction body 100 can be preset, and after reaching the pressing force, the hydraulic cylinder is stopped from acting, and the reaction body 100 is then pressed tightly.

[0103] In some embodiments, the reaction body 100 is placed on the frame 540, and the pressing action of the reaction body 100 is completed on the frame 540.

[0104] It can be understood that the hydraulic cylinder can also be replaced by a linear driving member 510 such as an electric cylinder or a pneumatic cylinder.

[0105] Referring Figure 2 and Figure 3 , in this embodiment, end plates 600 are respectively arranged at the left and right ends of the reaction body 100. During the pressing action, the push plate 520 and the thrust frame 530 respectively contact the end plates 600 at both ends of the reaction body 100 and will not directly contact the electrode plate 110, so that the electrode plate 110 can be well protected.

[0106] The flow electrode lithium extraction device further includes a loosening prevention component 700, and the loosening prevention component 700 includes a connecting screw 710 and a connecting nut 720. The end plates 600 at both ends are stably connected by a plurality of connecting screws 710 and connecting nuts 720. Specifically, a plurality of connecting holes are provided on the end plates 600. Each connecting screw 710 extends in the left-right direction. The connecting screw 710 passes through the corresponding connecting holes of the two end plates 600, and the left and right ends of the connecting screw 710 are locked by the connecting nut 720. The connecting nut 720 abuts against the end plate 600, thereby realizing the locking of the two end plates 600. When the pressing component 500 has problems and cannot operate normally, the reaction body 100 can be pressed manually.

[0107] In this embodiment, the connecting holes are uniformly arranged along the edge of the end plate 600. When the end plate 600 is fixed by the connecting screw 710 and the connecting nut 720, the pressure exerted by the end plate 600 on the reaction body 100 is uniform, ensuring the pressing effect.

[0108] Refer to Figure 6 and Figure 7 In this embodiment, an isolation pad 800 is further provided between the end plate 600 and the reaction body 100. The isolation pad 800 is used to isolate the high-salt exudate of the electrode plate 110 to prevent corrosion of the end plate 600. At the same time, the isolation pad 800 can buffer the pressing force transmitted from the end plate 600 to the electrode plate 110, avoiding hard contact between the end plate 600 and the electrode plate 110 and generating excessive local stress.

[0109] In this embodiment, the isolation pad 800 is made of fluororubber with relatively high strength.

[0110] Refer to Figure 3 In some embodiments, the flow electrode lithium extraction device further includes a anti-falling rod 900. Mounting holes are respectively provided on the two end plates 600. The mounting holes are located below the electrode plate 110. The anti-falling rod 900 passes through the mounting holes of the two end plates 600 and abuts against the lower end of the electrode plate 110. It can be understood that the anti-falling rod 900 can provide a supporting force for the electrode plate 110 to prevent the electrode plate 110 from falling, facilitating the installation of the electrode plate 110.

[0111] In some embodiments, a plurality of anti-falling rods 900 are provided, which can jointly provide a supporting force for the electrode plate 110 to prevent the electrode plate 110 from falling when a single anti-falling rod 900 breaks, which may affect the installation. The anti-falling rod 900 can be made of materials such as fiberglass and stainless steel. In this embodiment, the anti-falling rod 900 is made of fiberglass, which has the advantages of light weight, high strength, and corrosion resistance.

[0112] In this embodiment, a total of six anti-falling rods 900 are provided, and each anti-falling rod 900 is respectively equipped with two locking nuts. During installation, first insert the anti-falling rods 900 into the mounting holes of the two end plates 600, and then manually or by a manipulator, insert the electrode plates 110 and the diaphragm 120 from top to bottom between the two end plates 600. The lower ends of the electrode plates 110 and the diaphragm 120 are blocked by the anti-falling rods 900 and will not fall. After all the electrode plates 110 and the diaphragm 120 are inserted and in place, use the pressing assembly 500 to press the end plates 600 and the electrode plates 110 tightly, and then tighten the locking nuts at both ends of each anti-falling rod 900, thus completing the installation of the electrode plates 110.

[0113] Referring to Figure 10 , in some embodiments, the end plate 600 is provided with lifting lugs 610. The lifting lugs 610 are arranged on the front and rear sides of the end plate 600, and the lifting lugs 610 are provided with operation holes 620. The operation holes 620 penetrate through the left and right wall surfaces of the lifting lugs 610. Workers can reach into the operation holes 620 by hand or by a manipulator, which is convenient for lifting the end plate 600 and the reaction body 100.

[0114] In this embodiment, the operation hole 620 is a rectangular hole, which is more conducive for workers to reach into the operation hole 620 and lift the end plate 600 and the reaction body 100. It can be understood that the operation hole 620 can also be in the shape of a square hole, a round hole, etc.

[0115] It can be understood that the width of the frame 540 in the front-rear direction needs to be shorter than the distance between the front end of the front lifting lug 610 and the rear end of the rear lifting lug 610. During installation, the lifting lugs 610 can be placed on the frame 540 to realize the placement of the reaction body 100 on the frame 540.

[0116] It can be understood that the entire installation process can be entirely operated manually without the need to invite a crane, which is convenient for installation and can save installation costs.

[0117] After the end plate 600 and the reaction body 100 are installed and tightened, the self-flushing pipe 200 and the backwashing pipe 400 are installed on the reaction body 100. To ensure the installation stability of the self-flushing pipe 200 and the backwashing pipe 400, the self-flushing pipe 200 and the backwashing pipe 400 are fixed to the end plate 600 by bolts. In this embodiment, flat strips are respectively arranged at both ends of the self-flushing pipe 200 and the backwashing pipe 400. The flat strips are convex and are matched with the wall surfaces of the self-flushing pipe 200 or the backwashing pipe 400, and a connecting plate protrudes forward and backward respectively. Holes are drilled in each connecting plate. Threaded holes are drilled at corresponding positions on the end plate 600. Place the self-flushing pipe 200 below the end plate 600, or place the backwashing pipe 400 above the end plate 600. After pressing with the flat strips, pass bolts through the holes in the connecting plate and the threaded holes in the end plate 600, and the fixing of the self-flushing pipe 200 and the backwashing pipe 400 can be completed. The self-flushing pipe 200 and the backwashing pipe 400 are locked in the space between the end plate 600 and the flat strips.

[0118] It can be understood that the flat strip can be made of steel material.

[0119] Refer to Figure 8 and Figure 9 In some embodiments, a sealing groove 117 is further provided on the electrode plate 110. The sealing groove 117 is arranged along the edge of the electrode plate 110. The sealing groove 117 is used to fill the sealing material, so that the electrode plate 110 is closely attached to the adjacent separator 120, avoiding the situation of slurry overflow.

[0120] In this embodiment, the sealing material is a foamed silica gel strip. Specifically, a sealing groove 117 with a width of 3 mm and a depth of 1.5 mm is engraved on the edge of the electrode plate 110, and a foamed silica gel strip with a diameter of 3 mm is filled in the sealing groove 117.

[0121] It can be understood that during the process of pressing the electrode plate 110, the pores in the foamed silica gel strip are compressed, and at the same time, it has a certain elasticity, which can block the slurry from overflowing and has good sealing performance. By setting the sealing groove 117 and the foamed silica gel strip, the electrode plate 110 and the separator 120 can reach a completely attached state after pressing, that is, a "zero pole distance" is achieved between adjacent electrode plates 110. This can avoid the slurry flowing through the gap between the separator 120 and the electrode plate 110 to a place outside the flow groove 111 of the electrode plate 110, resulting in a short circuit. It can be understood that once a short circuit occurs in the flow-through electrode lithium extraction device, due to the narrow gap between the electrode plate 110 and the separator 120, the slurry particles are very easy to accumulate in the gap. By setting the sealing groove 117 and filling the sealing material, the situation of slurry accumulation can be avoided to a certain extent.

[0122] Refer to Figure 6 and Figure 8, each plate 110 is provided with a tab 130, and the tab 130 is used to conduct direct current to the plate 110. In some embodiments, the tab 130 is formed by cutting a graphite plate and is fixedly connected to the plate 110. By cutting off the redundant part of the graphite plate, the tab 130 is formed on the side of the plate 110, and the width of the whole graphite plate needs to be wider, resulting in a high cost. In other embodiments, the tab 130 is detachably connected to the plate 110. The graphite plate does not need to be cut and can be used as a whole to make the plate 110, which can reduce the width of the whole graphite plate and lower the cost.

[0123] In this embodiment, the tab 130 and the plate 110 are detachably connected by means of a threaded connection. A standard copper bolt with a conductivity much higher than that of the graphite plate is combined with a cold-pressed terminal to form the tab 130, which has strong conductivity and is convenient for wiring.

[0124] In this embodiment, the tabs 130 of the cathode plate 110 and the anode plate 110 are staggered, that is, the tabs 130 connected to two adjacent plates 110 are respectively located on the upper and lower sides of the plate 110, rather than at the same horizontal height, which can avoid the mutual influence of the tab wiring during the power-on process.

[0125] Before lithium extraction by the flow electrode lithium extraction device according to the embodiment of the present invention, the worker installs the end plate 600 on the frame 540 through the lifting ear 610, installs the anti-falling rod 900 at the lower ends of the two end plates 600, and then sequentially places the cathode plate 110 and the anode plate 110 between the two end plates 600. Under the supporting action of the anti-falling rod 900, the plate 110 will not fall and will be stable between the two end plates 600. A diaphragm 120 is placed between two adjacent plates 110 to form a reaction body 100. The reaction body 100 is pressed by the pressing assembly 500, and the linear pushing member 510 drives the push plate 520 to move towards the thrust frame 530, so that the reaction body 100 is pressed against the thrust frame 530 to avoid the leakage of the slurry from the gap between the plate 110 and the diaphragm 120. Then, the two end plates 600 are locked by the anti-loosening assembly 700 to further press the reaction body 100. After the pressing of the reaction body 100 is completed, the self-flushing pipe 200, the valve 300 and the backwashing pipe 400 are installed on the reaction body 100, and then the lithium extraction operation can be carried out.

[0126] During the process of lithium extraction, all valves 300 are opened, and the first slurry port 220 of the self-flushing pipe 200 and the second slurry port 420 of the backwashing pipe 400 are opened. The slurry enters the flow channels 111 of each electrode plate 110 from the self-flushing pipe 200. After the cathode slurry entering the cathode electrode plate 110 and the anode slurry entering the anode electrode plate 110 are electrified, lithium extraction is achieved. The lithium ions are adsorbed by iron phosphate in the cathode slurry to become lithium iron phosphate, and the lithium iron phosphate in the anode slurry is converted into iron phosphate. The reacted slurry is discharged and recycled through the second slurry port 420. The recycled iron phosphate is added back to the cathode electrode plate 110, and the recycled lithium iron phosphate is added back to the anode electrode plate 110. During the whole process, there is no need to reverse the power supply polarity. After reacting for a period of time, a clear liquid with a high lithium content can be obtained.

[0127] In order to avoid the situation of slurry blockage caused by the long-term lithium extraction process, after the lithium extraction reaction proceeds for a period of time, the online liquid-carrying self-flushing of the flow-through electrode lithium extraction device can be realized through the cooperation of the self-flushing pipe 200 and the valves 300, so as to avoid the situation of slurry accumulation during the reaction. After reacting for a period of time, some valves 300 are closed, and only some valves 300 are kept open, so that the slurry enters the flow channels 111 where the valves 300 are open concentratedly. The flow rate of the slurry increases, and the flow velocity of the slurry entering the flow channels 111 increases, which can wash the accumulation inside the flow channels 111, thus avoiding blockage. After the self-flushing of some flow channels 111 is completed, the valves 300 corresponding to the flow channels 111 that have completed self-flushing are closed, and other valves 300 are opened to perform self-flushing on the flow channels 111 corresponding to the other valves 300.

[0128] After the lithium extraction is completed, the backwashing pipe 400 can be used to perform liquid-cut clean water backwashing on the flow channels 111 of the electrode plates 110. Open all valves 300, and open the first clean water port 230 and the second clean water port 430. Close the first slurry port 220 and the second slurry port 420. Inject clean water into the flow channels 111 of each electrode plate 110 through the backwashing pipe 400, and wash the flow channels 111 with clean water, then the liquid-cut clean water backwashing can be realized, and the situation of slurry accumulation in the flow channels 111 can be avoided.

[0129] The above has specifically described the preferred embodiments of the present invention, but the present invention is not limited to the described embodiments. Those skilled in the art can also make various equivalent variations or substitutions without departing from the spirit of the present invention, and these equivalent variations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A mobile electrode lithium extraction device, characterized in that: include: A reaction body (100) comprises a plurality of electrode plates (110) and a diaphragm (120), wherein the plurality of electrode plates (110) are arranged along a first direction, each electrode plate (110) is provided with a flow groove (111) and two inlets and outlets (112), the two inlets and outlets (112) are respectively opened in an upward and downward direction and are respectively connected to the flow groove (111), the diaphragm (120) is arranged between two adjacent electrode plates (110), and the flow groove (111) is opened toward the diaphragm (120); A self-flushing pipe (200) is provided at the lower side of the reaction body (100), the self-flushing pipe (200) is provided with a plurality of first flow diversion ports (210), the first flow diversion ports (210) are arranged in one-to-one correspondence with the electrode plates (110), and are respectively connected to the flow grooves (111) of the corresponding electrode plates (110); A plurality of valves (300), wherein the plurality of valves (300) are arranged in a one-to-one correspondence with the plurality of first diversion ports (210), and are used to open or close the corresponding first diversion ports (210).

2. The mobile electrode lithium extraction device according to claim 1, characterized in that: The self-flushing pipe (200) is provided with a first slurry port (220) and a first clean water port (230), wherein the first slurry port (220) is used to provide slurry, and the first clean water port (230) is used to drain water. The mobile electrode lithium extraction device further comprises: A backwash pipe (400) is arranged on the upper side of the reaction body (100) and is provided with a plurality of second branch ports (410). The second branch ports (410) are arranged in a one-to-one correspondence with the electrode plates (110) and are respectively connected to the flow grooves (111) of the corresponding electrode plates (110). The backwash pipe (400) is provided with a second slurry port (420) and a second clean water port (430). The second slurry port (420) is used to discharge slurry, and the second clean water port (430) is used to provide clean water.

3. The mobile electrode lithium extraction device according to claim 1, characterized in that: The flow groove (111) has a plurality of vertical sections (113) and a plurality of arc sections (114); two adjacent vertical sections (113) are connected via the arc sections (114); and the flow directions in the two adjacent vertical sections (113) are opposite.

4. The mobile electrode lithium extraction device according to claim 3, characterized in that: A guide ridge (115) is provided in the flow groove (111); the guide ridge (115) is located in the circular arc segment (114) and is bent along the bending direction of the circular arc segment (114); the guide ridge (115) divides the circular arc segment (114) into an outer ring flow channel and an inner ring flow channel; the radius of the outer ring flow channel is greater than the radius of the inner ring flow channel.

5. The mobile electrode lithium extraction device according to claim 1, characterized in that: The inlet and outlet ends of the flow groove (111) are respectively provided with a slope structure (116), one end of the slope structure (116) is connected to the groove wall of the flow groove (111), and the other end is inclined toward the middle of the corresponding inlet and outlet (112).

6. The mobile electrode lithium extraction device according to claim 1, characterized in that: The mobile electrode lithium extraction device also includes: The clamping assembly (500) comprises a linear pushing component (510), a push plate (520) and a thrust frame (530), wherein the push plate (520) and the thrust frame (530) are respectively located on two sides of the reaction body (100) along a first direction, and the linear pushing component (510) is drivingly connected to the push plate (520) to drive the push plate (520) to move closer to or away from the thrust frame (530).

7. The mobile electrode lithium extraction device according to claim 1, characterized in that: The mobile electrode lithium extraction device also includes: Two end plates (600), the two end plates (600) being respectively arranged at two ends of the reaction body (100) along the first direction and connected to the electrode plates (110) at two ends of the reaction body (100), and the two end plates (600) being respectively provided with a plurality of connection holes; The anti-loosening assembly (700) comprises a connecting screw (710) and a connecting nut (720), wherein the connecting screw (710) is inserted into the corresponding connecting holes of the two end plates (600), and the connecting nut (720) is locked to the two ends of the connecting screw (710) along the first direction and abuts against the end plates (600).

8. The mobile electrode lithium extraction device according to claim 7, characterized in that: The mobile electrode lithium extraction device also includes: An isolation pad (800), wherein one side of the isolation pad (800) is connected to the end plate (600), and the other side of the isolation pad (800) is connected to the electrode plate (110).

9. The mobile electrode lithium extraction device according to claim 7, characterized in that: The mobile electrode lithium extraction device also includes: A fall-stopping rod (900) is provided through the two end plates (600) and is provided on the lower side of the reaction body (100); the fall-stopping rod (900) abuts against the lower end of the electrode plate (110).

10. The mobile electrode lithium extraction device according to claim 7, characterized in that: The end plate (600) is provided with a lifting ear (610), and the lifting ear (610) is extended along a second direction, the second direction is perpendicular to the first direction and the up-down direction, and the lifting ear (610) is provided with an operation hole (620), and the operation hole (620) passes through the two side walls of the lifting ear (610) along the first direction.

11. The mobile electrode lithium extraction device according to claim 1, characterized in that: The electrode plate (110) is also provided with a sealing groove (117), the sealing groove (117) being arranged along the edge of the electrode plate (110), and a sealing material being arranged in the sealing groove (117), the sealing material being used to seal the electrode plate (110) and the diaphragm (120).

12. The mobile electrode lithium extraction device according to claim 1, characterized in that: The reaction body (100) further comprises a pole ear (130), a plurality of the pole ears (130) are provided, the pole ears (130) are arranged in a one-to-one correspondence with the pole plate (110), and the pole ears (130) and the pole plate (110) are detachably connected.

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