A high-efficiency multi-channel electrodialysis device for lithium extraction from salt lakes

Abstract

The present invention provides a high-efficiency multi-channel electrodialysis device for extracting lithium from salt lakes, which relates to the field of electrodialysis technology and includes a bottom plate, a support plate, and a base, wherein the upper side of the bottom plate is fixedly connected to the lower side of the support plate and the lower side of the base. The present invention stores a cation-rich solution inside four cylindrical shells, at which time the anode plate and the cathode ring are energized, and the folding membrane stack plays a role. The cations in the cation-rich solution pass through the folding membrane stack and enter the inner cavity of the folding membrane stack, and the anions are blocked in the gap between the folding membrane stack and the cylindrical shell. Since the folding membrane stack is in a folded and curved shape, the efficiency of selective permeability is improved when separating anions and cations. At the same time, the curved exchange membrane stack increases the area during the exchange of anions and cations, increases the exchange rate, and thus increases the production capacity of electrodialysis.

Description

Technical Field

[0001] The present invention relates to the technical field of electrodialysis, and in particular to a high-efficiency multi-channel electrodialysis device used for extracting lithium from salt lakes. Background Art

[0002] Under the action of a direct current electric field, the selective permeability of anion and cation exchange membranes to anions and cations in the solution is used to separate solutes and water. This process is called electrodialysis. The technology of using electrodialysis to purify and separate substances is called electrodialysis. It was originally used for seawater desalination and is now widely used in chemical, light, metallurgical, papermaking, and pharmaceutical industries. It is especially valued for the preparation of pure water and the treatment of three wastes in environmental protection, such as its use in lithium extraction from salt lakes.

[0003] In the prior art, such as the "A multi-channel electrodialysis device" of Chinese patent application number CN106365273A, it includes an upper electrode plate and a lower electrode plate, a cylindrical membrane stack assembly is provided between the upper electrode plate and the lower electrode plate, the membrane stack assembly is provided with a plurality of liquid channels passing through the membrane stack assembly along the vertical axis, the upper electrode plate and the lower electrode plate are both provided with a pole liquid tube, the pole liquid tube is provided with a pole liquid port, the pole liquid tube is communicated with the outside world through the pole liquid port, at least four liquid ports are provided at positions corresponding to the liquid channels on the upper electrode plate and / or the lower electrode plate, one end of the liquid port communicating with the outside world is located on the side of the upper electrode plate and / or the lower electrode plate, the other end of the liquid port is communicated with the liquid channel, and electrode terminals are provided on both the upper electrode plate and the lower electrode plate. The multi-channel electrodialysis device provided by this invention has the advantages of less leakage, high current efficiency, and high desalination efficiency.

[0004] However, in the existing technology, lithium extraction from salt lakes is an important way to manufacture and produce lithium resources. Compared with lithium extraction from hard rock mines, the cost is lower. The most important technology in lithium extraction from salt lakes is electrodialysis technology. However, due to the small area of ​​the exchange membrane in salt lake lithium extraction technology, the production time is long and the efficiency during extraction is low, resulting in low production capacity. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem that lithium extraction from salt lakes is an important way to manufacture and produce lithium resources, and its cost is lower than that of lithium extraction from hard rock mines. The most important technology in lithium extraction from salt lakes is electrodialysis technology. However, due to the small area of ​​the exchange membrane in the lithium extraction technology from salt lakes, the production time is long, the efficiency during extraction is low, and the production capacity is low.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a high-efficiency multi-channel electrodialysis device for lithium extraction from salt lakes, comprising a bottom plate, a support plate, and a base, wherein the upper side of the bottom plate is fixedly connected to the lower side of the support plate and the lower side of the base, a stirring mechanism is fixedly connected to the upper side of the support plate, a preliminary electrodialysis mechanism is fixedly installed on the upper side of the bottom plate, and a monomer electrodialysis mechanism is fixedly connected to the lower portion of the outer surface of the preliminary electrodialysis mechanism;

[0007] The monomer electrodialysis mechanism includes an output tube, the upper side of the output tube is fixedly connected to a gathering tube, the four upper ports of the gathering tube are fixedly connected to a cylindrical shell, the inner cavity bottom surfaces of the four cylindrical shells are movably clamped with cathode rings, the upper sides of the four cathode rings are fixedly connected to a folding membrane stack, the upper sides of the four folding membrane stacks are fixedly connected to an anode plate, and a gap exists between the outer side of the folding membrane stack and the inner wall of the cylindrical shell;

[0008] A spring is clamped on the upper side of the anode plate, a round cover is fixedly connected to the upper side of the spring, a sealing ring is sleeved on the lower side of the round cover, an upper connecting shell is threadedly connected to the lower portion of the outer surface of the round cover, the lower side of the sealing ring is clamped to the inner wall of the round cover, the lower side of the upper connecting shell is fixedly connected to the upper side of the cylindrical shell by bolts, a connecting end pipe is threadedly connected to the outer side of the upper connecting shell, a connecting end pipe is fixedly connected to the other end of the connecting end pipe, and a water outlet is fixedly connected to the upper outer side of the cylindrical shell.

[0009] Preferably, a transfer water pump is fixedly connected to the upper portion of the outer surface of the preliminary electrodialysis mechanism, and the lower side of the transfer water pump is fixedly connected to the upper side of the base.

[0010] Preferably, the preliminary electrodialysis mechanism includes a water pump, the lower side of the water pump is fixedly connected to an upper cover, the upper side of the upper cover is fixedly clamped with a fixing piece near the edge, and the lower end of the fixing piece is fixedly connected to the tank body.

[0011] Preferably, the lower side of the upper cover is movably connected to a connecting ring frame, the middle part of the connecting ring frame is fixedly connected to an anode ring by bolts, the lower side of the anode ring is fixedly connected to a coarse membrane stack, and the lower side of the coarse membrane stack is fixedly connected to a cathode plate.

[0012] Preferably, the outer side of the connecting ring frame is movably connected to the inner wall of the tank body, the lower side of the cathode plate is movably connected to the bottom of the inner cavity of the tank body, and the lower side of the tank body is fixedly connected to a supporting leg.

[0013] Preferably, the upper portion of the outer surface of the tank body is fixedly connected to one end of the transfer water pump, the other end of the transfer water pump is fixedly connected to a box body, and a bearing is fixedly connected to the interior of the box body.

[0014] Preferably, a stirring wheel is fixedly mounted in the middle of the bearing, and the outer side of the stirring wheel overlaps the inner wall of the box.

[0015] Preferably, a driven gear is fixedly mounted on one end of the stirring wheel and located on the outside of the box body, and a driving gear is meshedly connected to the outside of the driven gear.

[0016] Preferably, a gearbox is fixedly installed in the middle of the driving gear, a driven pulley is fixedly installed on the other side of the gearbox, a belt is movably connected to the outer side of the driven pulley, and a driving pulley is movably connected to the inner side of the belt.

[0017] Preferably, a stepper motor is fixedly installed in the middle of the driving pulley, a support frame is fixedly connected to the lower side of the stepper motor, the upper side of the support frame is fixedly connected to the lower side of the gearbox, one side of the support frame is fixedly connected to one side of the box body, and the lower side of the support frame is fixedly connected to the upper side of the base plate.

[0018] Compared with the prior art, the advantages and positive effects of the present invention are:

[0019] 1. In the present invention, multiple electrodialysis is achieved by setting a monomer electrodialysis mechanism. At the same time, the curved exchange membrane stack increases the area for the exchange of anions and cations, and increases the exchange rate. By opening the four connecting valves, the cation-rich solution temporarily stored in the gap between the coarse membrane stack and the tank body enters the upper connecting shell through the connecting end tube. The round cover and the upper connecting shell are fixed by threads, and a sealing ring is added to form a sealed space. The cation-rich solution is stored inside the four cylindrical shells. At this time, the anode plate and the cathode ring are energized, and the folded membrane stack works. The cations in the cation-rich solution pass through the folded membrane stack and enter the folded membrane stack. In the inner cavity, anions are blocked in the gap between the folded membrane stack and the column shell. Since the folded membrane stack is folded and curved, the efficiency of selective permeability is improved when separating anions and cations. Then the collecting tube is opened, and the cationic solutions separated again in the inner cavities of the four folded membrane stacks converge into the output tube, and finally electrodialyze a solution rich in cationic lithium ions. When the collecting tube is opened, the water outlet is opened at the same time, and the solution containing a small amount of anions is discharged from the water outlet to achieve lithium ion separation. This is one cycle, and the above steps are repeated again to complete the electrodialysis operation of the remaining original halogen, thereby increasing the anion and cation exchange rate and thus increasing the electrodialysis capacity.

[0020] 2. In the present invention, a stirring mechanism is provided to break up the lumpy substances precipitated and aggregated in the raw brine and make them into small particles. By starting the stepper motor to rotate, the stepper motor drives the driving pulley to rotate, and the power of the driving pulley is transmitted to the driven pulley through the belt. The driven pulley injects power into the gearbox. After the gearbox changes speed, it drives the driving gear to rotate, and the meshing driven gear is driven, thereby driving the stirring wheel to rotate inside the box. The operator transfers the raw brine in the salt lake to the inside of the box, and the stirring wheel stirs the raw brine to break up the lumpy substances precipitated and aggregated in the raw brine, which is convenient for subsequent electrodialysis operation and avoids clogging of the pipeline.

[0021] 3. In the present invention, a preliminary electrodialysis mechanism is provided to realize preliminary electrodialysis, and the anions and cations in the raw brine are separated for the first time. The raw brine inside the box body is transferred to the preliminary electrodialysis mechanism by starting the transfer water pump. When the raw brine is completely filled into the tank body, the transfer water pump is turned off and the transfer of raw brine is stopped. After the anode ring and the cathode plate are energized, the coarse membrane stack begins to function, and the anions in the raw brine pass through the coarse membrane stack into the cylindrical cavity composed of the coarse membrane stack and the cathode plate, and the cations are stored in the gap between the coarse membrane stack and the tank body. The water pump is started while the connecting valve is opened, and the water pump discharges the anion solution in the cylindrical cavity composed of the coarse membrane stack and the cathode plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the three-dimensional structure of a high-efficiency multi-channel electrodialysis device for lithium extraction from salt lakes proposed in the present invention;

[0023] Figure 2 This is a schematic diagram of the three-dimensional structure of a high-efficiency multi-channel electrodialysis device for lithium extraction from salt lakes proposed in the present invention;

[0024] Figure 3 This is a schematic diagram of the rear view of the stirring mechanism of a high-efficiency multi-channel electrodialysis device for lithium extraction from salt lakes proposed in the present invention;

[0025] Figure 4 This is a schematic diagram of the internal structure of the stirring mechanism of a high-efficiency multi-channel electrodialysis device used for lithium extraction from salt lakes proposed in the present invention;

[0026] Figure 5 This is a schematic structural diagram of four single electrodialysis mechanisms in a high-efficiency multi-channel electrodialysis device for lithium extraction from salt lakes proposed in the present invention;

[0027] Figure 6 This is a schematic diagram of the exploded structure of a single electrodialysis mechanism of a high-efficiency multi-channel electrodialysis device for lithium extraction from salt lakes proposed in the present invention;

[0028] Figure 7The present invention proposes a structural schematic diagram of the decomposed folded membrane stack of a high-efficiency multi-channel electrodialysis device used for lithium extraction from salt lakes.

[0029] Legend: 1. Bottom plate;

[0030] 2. Support plate;

[0031] 3. Stirring mechanism; 31. Driven gear; 32. Stepper motor; 33. Driving pulley; 34. Belt; 35. Driving gear; 36. Gearbox; 37. Driven pulley; 38. Support frame; 39. Box; 310. Stirring wheel; 311. Bearing;

[0032] 4. Base;

[0033] 5. Transfer water pump;

[0034] 6. Preliminary electrodialysis mechanism; 61. Water pump; 62. Upper cover; 63. Fixing parts; 64. Connecting ring frame; 65. Anode ring; 66. Coarse membrane stack; 67. Cathode plate; 68. Tank; 69. Support legs;

[0035] 7. Single electrodialysis mechanism; 71. Connecting valve; 72. Collecting tube; 73. Output tube; 74. Round cover; 75. Sealing ring; 76. Upper connecting shell; 77. Spring; 78. Connecting end tube; 79. Column shell; 710. Anode plate; 711. Folding membrane stack; 712. Cathode ring; 713. Water outlet. DETAILED DESCRIPTION

[0036] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0037] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0038] Example 1

[0039] like Figure 1-7As shown, the present invention provides a high-efficiency multi-channel electrodialysis device for extracting lithium from salt lakes, a high-efficiency multi-channel electrodialysis device for extracting lithium from salt lakes, comprising a bottom plate 1, a support plate 2 and a base 4, the upper side of the bottom plate 1 is fixedly connected to the lower side of the support plate 2 and the lower side of the base 4, the upper side of the support plate 2 is fixedly connected to a stirring mechanism 3, the upper side of the bottom plate 1 is fixedly installed with a preliminary electrodialysis mechanism 6, the lower part of the outer surface of the preliminary electrodialysis mechanism 6 is fixedly connected to a monomer electrodialysis mechanism 7, the monomer electrodialysis mechanism 7 comprises an output pipe 73, the upper side of the output pipe 73 is fixedly connected to a gathering pipe 72, the four upper ports of the gathering pipe 72 are fixedly connected to a cylindrical shell 79, the inner cavity bottom surfaces of the four cylindrical shells 79 are movably clamped with cathode rings 712, the four cathode rings 712 The upper side of each of the four folding membrane stacks 711 is fixedly connected to a folding membrane stack 711, and the upper sides of each of the four folding membrane stacks 711 are fixedly connected to an anode plate 710. There is a gap between the outer side of the folding membrane stack 711 and the inner wall of the cylindrical shell 79. A spring 77 is clamped on the upper side of the anode plate 710, and a round cover 74 is fixedly connected to the upper side of the spring 77. A sealing ring 75 is sleeved on the lower side of the round cover 74. The lower part of the outer surface of the round cover 74 is threadedly connected to the upper connecting shell 76, and the lower side of the sealing ring 75 is clamped to the inner wall of the round cover 74. The lower side of the upper connecting shell 76 is fixedly connected to the upper side of the cylindrical shell 79 by bolts. The outer side of the upper connecting shell 76 is threadedly connected to a connecting end pipe 78, and the other end of the connecting end pipe 78 is fixedly connected to a connecting valve 71. The outer upper part of the cylindrical shell 79 is fixedly connected to a water outlet 713.

[0040] By opening the four connecting valves 71, the cation-rich solution temporarily stored in the gap between the coarse membrane stack 66 and the tank body 68 enters the upper connecting shell 76 through the connecting end pipe 78. The round cover 74 and the upper connecting shell 76 are fixed by threads, and a sealing ring 75 is added to form a sealed space. The cation-rich solution is stored inside the four cylindrical shells 79. When the connecting valves 71 are opened, the water pump 61 is started. The water pump 61 discharges the anion solution in the cylindrical cavity composed of the coarse membrane stack 66 and the cathode plate 67. At this time, the anode plate 710 and the cathode ring 712 are energized, and the folding membrane stack 711 takes effect. The cations in the cation-rich solution pass through the folding membrane stack 711 and enter the inner cavity of the folding membrane stack 711, and the anions are blocked between the folding membrane stack 711 and In the gap of the column shell 79, since the folded membrane stack 711 is in a folded and curved shape, the efficiency of selective permeability is improved when separating anions and cations. Then the collecting tube 72 is opened, and the cationic solutions separated again in the inner cavity of the four folded membrane stacks 711 converge into the output tube 73, and finally electrodialyze a solution rich in cationic lithium ions. When the collecting tube 72 is opened, the water outlet 713 is opened, and the solution containing a small amount of anions is discharged from the water outlet 713 to achieve lithium ion separation. This is one cycle, and the above steps are repeated again to complete the electrodialysis operation of the remaining original halogen. By setting a monomer electrodialysis mechanism 7, multiple electrodialysis can be achieved. At the same time, the curved exchange membrane stack increases the area for the exchange of anions and cations, increases the exchange rate, and thus increases the production capacity of the electrodialysis.

[0041] Example 2

[0042] like Figure 1 and Figure 4 As shown, the upper portion of the outer surface of the preliminary electrodialysis mechanism 6 is fixedly connected to a transfer water pump 5, the lower side of the transfer water pump 5 is fixedly connected to the upper side of the base 4, the preliminary electrodialysis mechanism 6 includes a water pump 61, the lower side of the water pump 61 is fixedly connected to an upper cover 62, the upper side of the upper cover 62 is fixedly clamped with a fixing piece 63 near the edge, the lower end of the fixing piece 63 is fixedly connected to the tank body 68, the lower side of the upper cover 62 is movably clamped with a connecting ring frame 64, the middle part of the connecting ring frame 64 is fixedly connected to an anode ring 65 by bolts, the lower side of the anode ring 65 is fixedly connected to a coarse membrane stack 66, the lower side of the coarse membrane stack 66 is fixedly connected to a cathode plate 67, the outer side of the connecting ring frame 64 is movably clamped with the inner wall of the tank body 68, the lower side of the cathode plate 67 is movably clamped with the bottom of the inner cavity of the tank body 68, and the lower side of the tank body 68 is fixedly connected with a supporting leg 69;

[0043] By setting up a preliminary electrodialysis mechanism 6, preliminary electrodialysis is achieved, and the anions and cations in the raw halogen are separated for the first time. The transfer water pump 5 starts working to transfer the raw halogen inside the box 39 to the preliminary electrodialysis mechanism 6. When the raw halogen is completely filled into the tank 68, the transfer water pump 5 is turned off and the transfer of the raw halogen is stopped. After the anode ring 65 and the cathode plate 67 are energized, the coarse membrane stack 66 begins to work, and the anions in the raw halogen pass through the coarse membrane stack 66 into the cylindrical cavity composed of the coarse membrane stack 66 and the cathode plate 67. The cations are stored in the gap between the coarse membrane stack 66 and the tank 68. The water pump 61 is started while the connecting valve 71 is opened. The water pump 61 discharges the anion solution in the cylindrical cavity composed of the coarse membrane stack 66 and the cathode plate 67.

[0044] Example 3

[0045] like Figure 1 、 Figure 2 and Figure 3 As shown, the upper portion of the outer surface of the tank body 68 is fixedly connected to one end of the transfer water pump 5, and the other end of the transfer water pump 5 is fixedly connected to the box body 39. The interior of the box body 39 is fixedly connected to a bearing 311. The middle of the bearing 311 is fixedly installed with a stirring wheel 310. The outer side of the stirring wheel 310 overlaps the inner wall of the box body 39. One end of the stirring wheel 310 is fixedly installed on the outer side of the box body 39. The outer side of the driven gear 31 is meshed with the driving gear 35. The middle of the driving gear 35 is fixedly installed. There is a gearbox 36, a driven pulley 37 is fixedly installed on the other side of the gearbox 36, a belt 34 is movably connected to the outer side of the driven pulley 37, a driving pulley 33 is movably connected to the inner side of the belt 34, a stepping motor 32 is fixedly installed in the middle of the driving pulley 33, a support frame 38 is fixedly connected to the lower side of the stepping motor 32, the upper side of the support frame 38 is fixedly connected to the lower side of the gearbox 36, one side of the support frame 38 is fixedly connected to one side of the box body 39, and the lower side of the support frame 38 is fixedly connected to the upper side of the bottom plate 1;

[0046] By setting up a stirring mechanism 3, the lumpy substances precipitated and aggregated in the raw brine can be broken up into small particles. By starting the stepper motor 32 to rotate, the stepper motor 32 drives the driving pulley 33 to rotate. The power of the driving pulley 33 is transmitted to the driven pulley 37 through the belt 34. The driven pulley 37 injects power into the gearbox 36. After the gearbox 36 changes speed, it drives the driving gear 35 to rotate, and the meshing driven gear 31 is driven. The driven gear 31 drives the stirring wheel 310 to rotate inside the box 39. The operator transfers the raw brine in the salt lake to the inside of the box 39. The stirring wheel 310 stirs the raw brine and breaks up the lumpy substances precipitated and aggregated in the raw brine, which facilitates the subsequent electrodialysis operation and avoids clogging of the pipeline.

[0047] The use method and working principle of this device are as follows: by starting the stepper motor 32 to work and rotate, the stepper motor 32 drives the driving pulley 33 to rotate, the power of the driving pulley 33 is transmitted to the driven pulley 37 through the belt 34, and the driven pulley 37 injects power into the gearbox 36. After the gearbox 36 changes speed, it drives the driving gear 35 to rotate, and the meshing driven gear 31 is driven, thereby the driven gear 31 drives the stirring wheel 310 to rotate inside the box 39. The operator transfers the raw brine in the salt lake to the inside of the box 39, and the stirring wheel 310 stirs the raw brine to break up the precipitated and aggregated block materials in the raw brine to make it into For small particles, the transfer water pump 5 starts to work and transfers the raw brine inside the box 39 to the preliminary electrodialysis mechanism 6. When the raw brine is completely filled into the tank 68, the transfer water pump 5 is turned off and the transfer of raw brine is stopped. After the anode ring 65 and the cathode plate 67 are energized, the coarse membrane stack 66 starts to work. The anions in the raw brine pass through the coarse membrane stack 66 and enter the cylindrical cavity composed of the coarse membrane stack 66 and the cathode plate 67. The cations are stored in the gap between the coarse membrane stack 66 and the tank 68. Since the coarse membrane stack 66 is used as the first step of electrodialysis, some anions will still exist. Open the four connecting valves 71 and temporarily store them in the coarse membrane stack 66 and the tank 68. The cation-rich solution in the gap enters the upper connecting shell 76 through the connecting end tube 78. The round cover 74 and the upper connecting shell 76 are fixed by threads, and a sealing ring 75 is added to form a sealed space. The cation-rich solution is stored inside the four cylindrical shells 79. When the connecting valve 71 is opened, the water pump 61 is started. The water pump 61 discharges the anion solution in the cylindrical cavity composed of the coarse membrane stack 66 and the cathode plate 67. At this time, the anode plate 710 and the cathode ring 712 are energized, and the folding membrane stack 711 takes effect. The cations in the cation-rich solution pass through the folding membrane stack 711 and enter the inner cavity of the folding membrane stack 711. In the cavity, anions are blocked in the gap between the folded membrane stack 711 and the column shell 79. Since the folded membrane stack 711 is in a folded and curved shape, the efficiency of selective permeability is improved when separating anions and cations. Then the collecting tube 72 is opened, and the cationic solutions separated again in the inner cavity of the four folded membrane stacks 711 converge into the output tube 73, and finally electrodialyze a solution rich in cationic lithium ions. When the collecting tube 72 is opened, the water outlet 713 is opened at the same time, and the solution containing a small amount of anions is discharged from the water outlet 713 to achieve lithium ion separation. This is one cycle, and the above steps are repeated again to complete the electrodialysis operation of the remaining original halogen.

[0048] The above description is merely a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any person skilled in the art may utilize the technical contents disclosed above to change or modify them into equivalent embodiments with equivalent changes for application in other fields. However, any simple modification, equivalent change, and modification of the above embodiments made in accordance with the technical essence of the present invention without departing from the technical solution of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A high-efficiency multi-channel electrodialysis device for lithium extraction from salt lakes, comprising a bottom plate (1), a support plate (2) and a base (4), characterized in that: The upper side of the bottom plate (1) is fixedly connected to the lower side of the support plate (2) and the lower side of the base (4); the upper side of the support plate (2) is fixedly connected to a stirring mechanism (3); the upper side of the bottom plate (1) is fixedly mounted with a preliminary electrodialysis mechanism (6); and the lower portion of the outer surface of the preliminary electrodialysis mechanism (6) is fixedly connected to a monomer electrodialysis mechanism (7); The upper portion of the outer surface of the preliminary electrodialysis mechanism (6) is fixedly connected to a transfer water pump (5), the lower side of the transfer water pump (5) is fixedly connected to the upper side of the base (4), and the preliminary electrodialysis mechanism (6) further comprises a water pump (61), the lower side of the water pump (61) is fixedly connected to an upper cover (62), the upper side of the upper cover (62) is fixedly connected to a fixing member (63) near the edge, the lower end of the fixing member (63) is fixedly connected to a tank body (68), the lower side of the upper cover (62) is movably connected to a connecting ring frame (64), the middle part of the connecting ring frame (64) is fixedly connected to an anode ring (65) by bolts, the lower side of the anode ring (65) is fixedly connected to a coarse membrane stack (66), and the lower side of the coarse membrane stack (66) is fixedly connected to a cathode plate (67); The upper portion of the outer surface of the tank body (68) is fixedly connected to one end of the transfer water pump (5), the other end of the transfer water pump (5) is fixedly connected to a box body (39), the interior of the box body (39) is fixedly connected to a bearing (311), a stirring wheel (310) is fixedly mounted in the middle of the bearing (311), the outer side of the stirring wheel (310) overlaps the inner wall of the box body (39), a driven gear (31) is fixedly mounted on one end of the stirring wheel (310) and located outside the box body (39), and the outer side of the driven gear (31) is meshedly connected to a driving gear (35); The monomer electrodialysis mechanism (7) includes an output tube (73), the upper side of the output tube (73) is fixedly connected to a gathering tube (72), the four upper ports of the gathering tube (72) are fixedly connected to a cylindrical shell (79), the inner cavity bottom surfaces of the four cylindrical shells (79) are movably clamped with cathode rings (712), the upper sides of the four cathode rings (712) are fixedly connected to a folding membrane stack (711), the upper sides of the four folding membrane stacks (711) are fixedly connected to an anode plate (710), and a gap exists between the outer side of the folding membrane stack (711) and the inner wall of the cylindrical shell (79); The upper side of the anode plate (710) is clamped with a spring (77), the upper side of the spring (77) is fixedly connected to a round cover (74), the lower side of the round cover (74) is sleeved with a sealing ring (75), the lower part of the outer surface of the round cover (74) is threadedly connected to an upper connecting shell (76), the lower side of the sealing ring (75) is clamped with the inner wall of the round cover (74), the lower side of the upper connecting shell (76) is fixedly connected to the upper side of the cylindrical shell (79) by bolts, the outer side of the upper connecting shell (76) is threadedly connected to a connecting end pipe (78), the other end of the connecting end pipe (78) is fixedly connected to a connecting valve (71), and the upper outer side of the cylindrical shell (79) is fixedly connected to a water outlet (713).

2. The high-efficiency multi-channel electrodialysis device for extracting lithium from salt lakes according to claim 1, characterized in that: The outer side of the connecting ring frame (64) is movably engaged with the inner wall of the tank body (68), the lower side of the cathode plate (67) is movably engaged with the bottom of the inner cavity of the tank body (68), and the lower side of the tank body (68) is fixedly connected with a support leg (69).

3. The high-efficiency multi-channel electrodialysis device for extracting lithium from salt lakes according to claim 1, characterized in that: A gearbox (36) is fixedly mounted in the middle of the driving gear (35), a driven pulley (37) is fixedly mounted on the other side of the gearbox (36), a belt (34) is movably connected to the outer side of the driven pulley (37), a driving pulley (33) is movably connected to the inner side of the belt (34), and a stepping motor (32) is fixedly mounted in the middle of the driving pulley (33).

4. The high-efficiency multi-channel electrodialysis device for extracting lithium from salt lakes according to claim 3, characterized in that: The lower side of the stepper motor (32) is fixedly connected to a support frame (38), the upper side of the support frame (38) is fixedly connected to the lower side of the gearbox (36), one side of the support frame (38) is fixedly connected to one side of the box (39), and the lower side of the support frame (38) is fixedly connected to the upper side of the base plate (1).

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