Salt lake lithium extraction electrodialysis apparatus

Abstract

Disclosed is a salt lake lithium extraction electrodialysis apparatus, which relates to the technical field of lithium salt production. Said apparatus comprises a containing assembly, an electrodialysis assembly, and a stirring assembly; the containing assembly comprises a barrel, a top cover, and a feed pipe; the top of the barrel is rotatably connected to the top cover, the barrel is in communication with one end of the feed pipe, and an inner slot is formed on an inner wall of the barrel; a communication pipe is arranged on the top cover; the electrodialysis assembly comprises a first anode cylinder, a first ion exchange membrane, a first cathode cylinder, a second ion exchange membrane, and a second anode cylinder; the top of the first anode cylinder is fixedly connected to the top cover, and a gap is present between the bottom of the first anode cylinder and the bottom wall of the barrel body. The present apparatus facilitates lithium chloride, sodium, and potassium cations in passing through the first ion exchange membrane and entering into a space between between the first ion exchange membrane and the first cathode cylinder, and after a round of purification, a concentrated solution is formed; also, the present apparatus can stir and mix a raw material liquid, which accelerates the movement of cations in the raw material liquid and is beneficial for improving extraction efficiency.

Description

A salt lake lithium extraction electrodialysis device TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of lithium salt production, and particularly relates to a salt lake lithium extraction electrodialysis device. BACKGROUND

[0002] The electrodialysis device is a device for separating ions or small charged molecules directly using electric energy. Electrodialysis technology has developed into a large-scale chemical unit process and occupies an important position in the field of membrane separation. It is widely used in chemical desalination, seawater desalination, food and medicine, and wastewater treatment fields, and has become the main method for producing drinking water in some areas. It has the advantages of low energy consumption, significant economic benefits, flexible device design and system application, convenient operation and maintenance, no pollution to the environment, long service life of the device, high recovery rate of raw water, etc.

[0003] In the related art, the core component of the electrodialysis is an ion exchange membrane, which mainly uses the selective permeability principle of the ion exchange membrane. At the same time, a direct current electric field is applied to the two sides of the membrane to cause directional migration of the anions and cations in the solution. Due to the different selective permeability of the ion exchange membrane to the anions and cations, the effect of concentrating and diluting the electrolyte solution is achieved. The electrodialysis device is composed of a membrane stack composed of a plurality of pairs of ion exchange membranes, electrode plates and locking devices. The intermediate spacer plate used when assembling the membrane stack mainly has the following functions: supporting and isolating the ion exchange membrane, forming different water distribution channels with the ion exchange membrane, increasing the disturbance of the fluid, and strengthening the mass transfer process. Today, the purity of the electrodialysis device in the field of industrial production is getting higher and higher. The electrodialysis device in the related art uses multiple purification devices for multistage purification, which occupies a large area and has low efficiency during extraction, resulting in low production capacity. SUMMARY

[0004] The technical problem to be solved by the present disclosure is that the electrodialysis device in the related art uses multiple purification devices for multistage purification, which occupies a large area and has low efficiency during extraction, resulting in low production capacity.

[0005] To solve the above technical problems, the present disclosure provides the following technical solutions: a salt lake lithium extraction electrodialysis device, comprising a containing assembly, an electrodialysis assembly and a stirring assembly, the containing assembly comprises a cylinder, a top cover and a feeding pipe, the top of the cylinder is rotationally connected with the top cover, the cylinder is communicated with one end of the feeding pipe, an inner groove is formed in the inner wall of the cylinder, and a communication pipe is formed in the top cover; the electrodialysis assembly comprises a first positive electrode cylinder, a first ion exchange membrane, a first negative electrode cylinder, a second ion exchange membrane and a second positive electrode cylinder, the top of the first positive electrode cylinder is fixedly connected with the top cover, a gap is left between the bottom of the first positive electrode cylinder and the bottom wall of the cylinder, the first ion exchange membrane, the first negative electrode cylinder, the second ion exchange membrane and the second positive electrode cylinder are sequentially sleeved in the first positive electrode cylinder, and the first ion exchange membrane, the first negative electrode cylinder, the second ion exchange membrane and the second positive electrode cylinder are fixedly connected with the top cover; the stirring assembly comprises a first spiral plate, the inner side of the first spiral plate is fixedly connected with the outer wall of the first positive electrode cylinder, and the outer side of the first spiral plate is slidingly connected with the inner wall of the cylinder.

[0006] In an embodiment: the stirring assembly further comprises a second spiral plate and a third spiral plate, the inner side of the second spiral plate is fixedly connected with the first negative electrode cylinder, a gap is left between the outer side of the second spiral plate and the first ion exchange membrane, the outer side of the third spiral plate is fixedly connected with the first negative electrode cylinder, and a gap is left between the inner side of the third spiral plate and the second ion exchange membrane.

[0007] In an embodiment: the spiral direction of the second spiral plate is opposite to that of the first spiral plate and the third spiral plate.

[0008] In an embodiment: the space between the first negative electrode cylinder and the second ion exchange membrane is communicated with the inner groove, the space between the first ion exchange membrane and the first negative electrode cylinder is communicated with one end of the communication pipe, and the other end of the communication pipe is communicated with the top of the space between the second ion exchange membrane and the second positive electrode cylinder.

[0009] In an embodiment: the outer wall of the second positive electrode cylinder is fixedly connected with a fixed plate, and the top of the fixed plate is fixedly connected with the bottom of the second ion exchange membrane.

[0010] In an embodiment: the inner wall of the second positive electrode cylinder is fixedly connected with one end of a fixed rod, and the other end of the fixed rod is fixedly connected with a fixed column.

[0011] In an embodiment: the bottom of the first ion exchange membrane is fixedly connected with a fixed ring, the bottom wall of the cylinder is provided with an annular groove corresponding to the fixed ring, and the fixed ring is rotationally connected with the annular groove.

[0012] In an embodiment: the outer wall of the fixed column is fixedly connected with a fourth spiral plate, and the spiral direction of the fourth spiral plate is the same as that of the second spiral plate.

[0013] [According to the rules 91 correction 09.09.2025] In an embodiment: the second positive cylinder top fixed connection first containing cylinder bottom, first containing cylinder top rotating connection second containing cylinder, second containing cylinder outer wall fixed connection limit ring, limit ring is provided with two, two limit ring is located in the second containing cylinder top wall both sides, second containing cylinder connecting discharge pipe one end, first containing cylinder outer wall fixed connection top cover.

[0014] In an embodiment: further comprising a drive assembly, the drive assembly comprising a motor, a drive shaft, a first gear and a second gear, the motor connecting the drive shaft, the drive shaft fixedly connecting the first gear, the first gear meshing with the second gear, the motor being installed on the outer wall of the cylinder body through the motor base.

[0015] The beneficial effects of the present disclosure: in the present disclosure, the top cover rotates to drive the first positive cylinder to rotate, the first positive cylinder drives the first spiral plate to rotate, the first spiral plate rotates to give the raw material liquid a downward pressure, so that the raw material liquid enters the space between the first positive cylinder and the first ion exchange membrane, and the cations of chlorine lithium ions, sodium ions and potassium ions pass through the first ion exchange membrane into the space between the first ion exchange membrane and the first negative cylinder, after one purification, form concentrated liquid, and can stir and mix the raw material liquid, accelerate the movement of cations in the raw material liquid, which is beneficial to improve the extraction efficiency, and can perform secondary purification on the raw material liquid, which is beneficial to improve the purity of the purified liquid, and the device occupies smaller area, and the utilization rate of the internal space of the device is higher. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a schematic diagram of the overall structure in the embodiment of the present disclosure.

[0017] Figure 2 is a schematic diagram of the overall structure in the embodiment of the present disclosure.

[0018] Figure 3 is an enlarged schematic diagram of B in Figure 2 in the embodiment of the present disclosure.

[0019] Figure 4 is a schematic diagram of the cylinder body in the embodiment of the present disclosure.

[0020] Figure 5 is an enlarged schematic diagram of C in Figure 2 in the embodiment of the present disclosure.

[0021] Figure 6 is a schematic diagram of the top cover and the electrodialysis assembly in the embodiment of the present disclosure.

[0022] Figure 7 is an enlarged schematic diagram of A in Figure 1 in the embodiment of the present disclosure.

[0023] [Corresponding to Rule 91 correction 09.09.2025] Mark: containing assembly 1, cylinder 11, inner groove 111, annular groove 112, top cover 12, communication pipe 121, feeding pipe 13, electrodialysis assembly 2, first positive electrode cylinder 21, first ion exchange membrane 22, first cathode cylinder 23, second ion exchange membrane 24, second positive electrode cylinder 25, fixing plate 251, fixing rod 252, fourth spiral plate 253, fixing column 254, first containing cylinder 26, limiting ring 261, discharge pipe 262, second containing cylinder 27, stirring assembly 3, first spiral plate 31, second spiral plate 32, third spiral plate 33, driving assembly 4, motor 41, motor base 411, drive shaft 42, first gear 43, second gear 44. Embodiment

[0024] In order to make the above-mentioned purposes, features and advantages of the present disclosure more obvious and easy to understand, the specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. Embodiment 1

[0025] Referring to FIGS. 1 and 2, this embodiment provides a salt lake lithium extraction electrodialysis device, comprising: a containing assembly 1, an electrodialysis assembly 2 and a stirring assembly 3, the containing assembly 1 comprising a cylinder 11, a top cover 12 and a feeding pipe 13, the top of the cylinder 11 being rotatably connected to the top cover 12, the cylinder 11 being connected to one end of the feeding pipe 13, an inner groove 111 being formed in the inner wall of the cylinder 11, and a communication pipe 121 being formed in the top cover 12.

[0026] In some embodiments, the inside of the cylinder 11 is used to contain raw material liquid, the cylinder 11 is cylindrical, the top cover 12 can rotate on the cylinder 11, and the feeding pipe 13 is used to add raw material liquid into the inside of the cylinder 11.

[0027] The electrodialysis assembly 2 comprises a first positive electrode cylinder 21, a first ion exchange membrane 22, a first cathode cylinder 23, a second ion exchange membrane 24 and a second positive electrode cylinder 25, the top of the first positive electrode cylinder 21 being fixedly connected to the top cover 12, a gap being left between the bottom of the first positive electrode cylinder 21 and the bottom wall of the cylinder 11, the first ion exchange membrane 22, the first cathode cylinder 23, the second ion exchange membrane 24 and the second positive electrode cylinder 25 being sequentially sleeved inside the first positive electrode cylinder 21, and the first ion exchange membrane 22, the first cathode cylinder 23, the second ion exchange membrane 24 and the second positive electrode cylinder 25 being fixedly connected to the top cover 12, respectively.

[0028] In some embodiments, the first positive electrode cylinder 21, the first ion exchange membrane 22, the first negative electrode cylinder 23, the second ion exchange membrane 24 and the second positive electrode cylinder 25 can be optionally provided with a cylindrical cylinder, and are concentrically arranged. The top cover 12 can drive the first ion exchange membrane 22, the first negative electrode cylinder 23, the second ion exchange membrane 24 and the second positive electrode cylinder 25 to move when the top cover 12 is lifted and moved. After the raw material liquid is added into the cylinder body 11 from the feeding pipe 13, the first positive electrode cylinder 21 repels the cations of the lithium chloride ions, sodium ions and potassium ions in the raw material liquid, while the first negative electrode cylinder 23 attracts the cations of the lithium chloride ions, sodium ions and potassium ions. The cations of the lithium chloride ions, sodium ions and potassium ions pass through the first ion exchange membrane 22 into the space between the first ion exchange membrane 22 and the first negative electrode cylinder 23, are purified once to form a concentrated liquid, and then the concentrated liquid passes through the communication pipe 121 into the space between the second ion exchange membrane 24 and the second positive electrode cylinder 25. The second positive electrode cylinder 25 repels the cations of the lithium chloride ions, sodium ions and potassium ions in the concentrated liquid, while the first negative electrode cylinder 23 attracts the cations of the lithium chloride ions, sodium ions and potassium ions. The cations of the lithium chloride ions, sodium ions and potassium ions pass through the second ion exchange membrane 24, are purified twice to form a purified liquid, and then the purified liquid enters the space between the first negative electrode cylinder 23 and the second ion exchange membrane 24, and then passes through the inner groove 111 into the bottom of the second positive electrode cylinder 25. Then the purified liquid is discharged from the top of the second positive electrode cylinder 25, and the purification of the cations of the lithium chloride ions, sodium ions and potassium ions is completed. The raw material liquid can be purified twice, which is beneficial to improve the purity of the purified liquid, and the device occupies a smaller area and has a higher utilization rate of the internal space.

[0029] The stirring assembly 3 comprises a first spiral plate 31, and the inner side of the first spiral plate 31 is fixedly connected to the outer wall of the first positive electrode cylinder 21, and the outer side of the first spiral plate 31 is slidably connected to the inner wall of the cylinder body 11.

[0030] In some embodiments, the top cover 12 can drive the first positive electrode cylinder 21 to rotate when the top cover 12 is rotated. The first positive electrode cylinder 21 can drive the first spiral plate 31 to rotate. When the first spiral plate 31 rotates, a downward pressure is applied to the raw material liquid, so that the raw material liquid enters the space between the first positive electrode cylinder 21 and the first ion exchange membrane 22. This facilitates the cations of the lithium chloride ions, sodium ions and potassium ions to pass through the first ion exchange membrane 22 into the space between the first ion exchange membrane 22 and the first negative electrode cylinder 23, are purified once to form a concentrated liquid, and the raw material liquid can be stirred and mixed, which accelerates the movement of the cations in the raw material liquid and is beneficial to improve the extraction efficiency. Example 2

[0031] Referring to FIGS. 1-7, this embodiment is based on the previous embodiment, and the difference between this embodiment and the previous embodiment is that.

[0032] The stirring assembly 3 further comprises a second spiral plate 32 and a third spiral plate 33. The first cathode cylinder 23 is fixedly connected to the inner side of the second spiral plate 32. A gap is left between the outer side of the second spiral plate 32 and the first ion exchange membrane 22. The first cathode cylinder 23 is fixedly connected to the outer side of the third spiral plate 33. A gap is left between the inner side of the third spiral plate 33 and the second ion exchange membrane 24.

[0033] In some embodiments, the top cover 12 can rotate the first cathode cylinder 23, the first cathode cylinder 23 can rotate the second spiral plate 32 and the third spiral plate 33, the second spiral plate 32 or the third spiral plate 33 can assist the movement of cations in the concentrated solution or the purified solution, which is conducive to improving the extraction efficiency.

[0034] The spiral direction of the second spiral plate 32 is opposite to that of the first spiral plate 31 and the third spiral plate 33. Therefore, when the first spiral plate 31, the second spiral plate 32 and the third spiral plate 33 rotate in the same direction, the thrust generated by the second spiral plate 32 is opposite to that of the first spiral plate 31 and the third spiral plate 33.

[0035] The space between the first cathode cylinder 23 and the second ion exchange membrane 24 is in communication with the inner groove 111. The space between the first ion exchange membrane 22 and the first cathode cylinder 23 is in communication with one end of the communication pipe 121. The other end of the communication pipe 121 is in communication with the top of the space between the second ion exchange membrane 24 and the second anode cylinder 25.

[0036] In some embodiments, when the second spiral plate 32 rotates, an upward force can be applied to the concentrated solution in the space between the first ion exchange membrane 22 and the first cathode cylinder 23. The concentrated solution enters the space between the second ion exchange membrane 24 and the second anode cylinder 25 through the communication pipe 121. The second anode cylinder 25 repels the cations of chloridion, sodium ion and potassium ion in the concentrated solution, while the first cathode cylinder 23 attracts the cations of chloridion, sodium ion and potassium ion. The cations of chloridion, sodium ion and potassium ion pass through the second ion exchange membrane 24, and after secondary purification, the purified solution is formed.

[0037] Further, the purified liquid enters the space between the first cathode cylinder 23 and the second ion exchange membrane 24, and the third spiral plate 33 can provide a downward force to the purified liquid in the space between the first cathode cylinder 23 and the second ion exchange membrane 24 when rotating, guiding the purified liquid into the inner groove 111, preventing the accumulation of purified liquid rich in lithium chloride ions, sodium ions and potassium ions in the space between the first cathode cylinder 23 and the second ion exchange membrane 24, affecting the extraction efficiency, and then the purified liquid enters the bottom of the second anode cylinder 25 through the inner groove 111, and then the purified liquid is discharged from the top of the second anode cylinder 25, completing the purification of the cations of lithium chloride ions, sodium ions and potassium ions. The raw material liquid can be purified twice, which is beneficial to improve the purity of the purified liquid, and the device occupies smaller area and has higher utilization rate of internal space.

[0038] The outer wall of the second anode cylinder 25 is fixedly connected with a fixed plate 251, and the top of the fixed plate 251 is fixedly connected with the bottom of the second ion exchange membrane 24.

[0039] In some embodiments, the fixed plate 251 can close the bottom of the second ion exchange membrane 24 and the second anode cylinder 25, preventing the concentrated liquid in the space between the second ion exchange membrane 24 and the second anode cylinder 25 from directly entering the inner groove 111 from the bottom of the second ion exchange membrane 24 and the second anode cylinder 25.

[0040] The inner wall of the second anode cylinder 25 is fixedly connected with one end of a fixed rod 252, and the other end of the fixed rod 252 is fixedly connected with a fixed column 254.

[0041] In some embodiments, a plurality of fixed rods 252 are arranged between the fixed column 254 and the inner wall of the second anode cylinder 25, which can support and fix the fixed column 254, and the second anode cylinder 25 can drive the fixed column 254 to rotate through the fixed rod 252.

[0042] [Corrected according to Rule 91 on 09.09.2025] The bottom of the first ion exchange membrane 22 is fixedly connected with a fixed ring, and the bottom wall of the cylinder body 11 is provided with an annular groove 112 corresponding to the fixed ring, and the fixed ring is rotatably connected with the annular groove 112.

[0043] [Corrected according to Rule 91 on 09.09.2025] In some embodiments, the fixed ring at the bottom of the first ion exchange membrane 22 is inserted into the annular groove 112, which can prevent the raw material liquid from passing through the bottom of the first ion exchange membrane 22 and affecting the purity of the concentrated liquid. When the first ion exchange membrane 22 rotates, the fixed ring can drive the rotation in the annular groove 112.

[0044] The outer wall of the fixed column 254 is fixedly connected with a fourth spiral plate 253, and the spiral direction of the fourth spiral plate 253 is the same as that of the second spiral plate 32.

[0045] In some embodiments, when the second positive electrode cylinder 25 rotates, the fixed rod 252 can drive the fixed column 254 to rotate, the fixed column 254 drives the fourth spiral plate 253 to rotate, and the fourth spiral plate 253 provides an upward force to the purified liquid, facilitating the discharge of the purified liquid.

[0046] [Corrected according to Rule 91 on 09.09.2025] The second positive electrode cylinder 25 is fixedly connected to the bottom of the first containing cylinder 26, the top of the first containing cylinder 26 is rotatably connected to the second containing cylinder 27, the outer wall of the second containing cylinder 27 is fixedly connected to the limiting ring 261, the limiting ring 261 is provided with two, and the two limiting rings 261 are located on both sides of the top wall of the second containing cylinder 27. The second containing cylinder 27 is connected to one end of the discharge pipe 262, and the outer wall of the first containing cylinder 26 is fixedly connected to the top cover 12.

[0047] [Corrected according to Rule 91 on 09.09.2025] In some embodiments, the first containing cylinder 26 can rotate relative to the outer wall of the second containing cylinder 27, and the limiting ring 261 can fix the position of the second containing cylinder 27 to prevent axial sliding of the second containing cylinder 27. When the second positive electrode cylinder 25 rotates, the fixed rod 252 can drive the fixed column 254 to rotate, the fixed column 254 drives the fourth spiral plate 253 to rotate, and the fourth spiral plate 253 provides an upward force to the purified liquid. The purified liquid enters the first containing cylinder 26 and the second containing cylinder 27, and then is discharged from the discharge pipe 262.

[0048] It also includes a driving assembly 4, which includes a motor 41, a drive shaft 42, a first gear 43 and a second gear 44, the motor 41 is connected to the drive shaft 42, the drive shaft 42 is fixedly connected to the first gear 43, the first gear 43 is meshingly connected to the second gear 44, and the motor 41 is installed on the outer wall of the cylinder body 11 through the motor base 411.

[0049] In some embodiments, when the motor 41 works, it can drive the drive shaft 42 to rotate, the drive shaft 42 drives the first gear 43 to rotate, the first gear 43 drives the second gear 44, the second gear 44 drives the cylinder body 11 to rotate, the first positive electrode cylinder 21 drives the first spiral plate 31 to rotate, the first cathode cylinder 23 drives the second spiral plate 32 and the third spiral plate 33 to rotate, and when the second positive electrode cylinder 25 rotates, the fixed rod 252 can drive the fixed column 254 to rotate, the fixed column 254 drives the fourth spiral plate 253 to rotate, which accelerates the flow of raw material liquid, concentrated liquid and purified liquid inside the cylinder body 11, and is conducive to improving the extraction efficiency.

Claims

1. A lithium extraction electrodialysis device for salt lakes, characterized by: include A containing assembly (1), the containing assembly (1) comprising a barrel (11), a top cover (12) and a feeding pipe (13), the top of the barrel (11) being rotatably connected to the top cover (12), the barrel (11) being connected to one end of the feeding pipe (13), an inner groove (111) being provided on the inner wall of the barrel (11), and a connecting pipe (121) being provided on the top cover (12); An electrodialysis assembly (2), the electrodialysis assembly (2) comprising a first positive electrode cylinder (21), a first ion exchange membrane (22), a first cathode cylinder (23), a second ion exchange membrane (24) and a second positive electrode cylinder (25), wherein the top of the first positive electrode cylinder (21) is fixedly connected to the top cover (12), a gap is left between the bottom of the first positive electrode cylinder (21) and the bottom wall of the cylinder body (11), the first ion exchange membrane (22), the first cathode cylinder (23), the second ion exchange membrane (24) and the second positive electrode cylinder (25) are sequentially sleeved inside the first positive electrode cylinder (21), and the first ion exchange membrane (22), the first cathode cylinder (23), the second ion exchange membrane (24) and the second positive electrode cylinder (25) are respectively fixedly connected to the top cover (12); A stirring assembly (3), the stirring assembly (3) comprising a first spiral plate (31), the inner side of the first spiral plate (31) being fixedly connected to the outer wall of the first positive electrode cylinder (21), and the outer side of the first spiral plate (31) being slidably connected to the inner wall of the cylinder (11).

2. The salt lake lithium extraction electrodialysis device according to claim 1, wherein: The stirring assembly (3) further comprises a second spiral plate (32) and a third spiral plate (33), wherein the inner side of the second spiral plate (32) is fixedly connected to the first cathode cylinder (23), and a gap is left between the outer side of the second spiral plate (32) and the first ion exchange membrane (22); the outer side of the third spiral plate (33) is fixedly connected to the first cathode cylinder (23), and a gap is left between the inner side of the third spiral plate (33) and the second ion exchange membrane (24).

3. The salt lake lithium extraction electrodialysis device according to claim 2, wherein: The spiral direction of the second spiral plate (32) is opposite to that of the first spiral plate (31) and the third spiral plate (33).

4. The salt lake lithium extraction electrodialysis device according to claim 3, wherein: The space between the first cathode cylinder (23) and the second ion exchange membrane (24) is connected to the inner tank (111), the top of the space between the first ion exchange membrane (22) and the first cathode cylinder (23) is connected to one end of the connecting tube (121), and the other end of the connecting tube (121) is connected to the top of the space between the second ion exchange membrane (24) and the second positive electrode cylinder (25).

5. The salt lake lithium extraction electrodialysis device according to claim 4, wherein: The outer wall of the second positive electrode cylinder (25) is fixedly connected to the fixing plate (251), and the top of the fixing plate (251) is fixedly connected to the bottom of the second ion exchange membrane (24).

6. The salt lake lithium extraction electrodialysis device according to claim 5, wherein: The inner wall of the second positive electrode cylinder (25) is fixedly connected to one end of a fixing rod (252), and the other end of the fixing rod (252) is fixedly connected to a fixing column (254).

7. [Corrected 09 / 09 / 2025 according to Rule 91] The electrodialysis device for extracting lithium from salt lakes according to claim 6, characterized in that: The bottom of the first ion exchange membrane (22) is fixedly connected to a fixing ring, and the bottom wall of the cylinder (11) is provided with an annular groove (112) corresponding to the fixing ring, and the fixing ring is rotatably connected to the annular groove (112).

8. [Corrected 09 / 09 / 2025 according to Rule 91] The electrodialysis device for extracting lithium from salt lakes according to claim 6, characterized in that: The outer wall of the fixing column (254) is fixedly connected to the fourth spiral plate (253), and the spiral direction of the fourth spiral plate (253) is the same as that of the second spiral plate (32).

9. [Corrected 09.09.2025 according to Rule 91] The electrodialysis device for extracting lithium from salt lakes according to claim 5, characterized in that: The top of the second positive electrode cylinder (25) is fixedly connected to the bottom of the first accommodating cylinder (26), the top of the first accommodating cylinder (26) is rotatably connected to the second accommodating cylinder (27), the outer wall of the second accommodating cylinder (27) is fixedly connected to a limiting ring (261), two limiting rings (261) are provided, and the two limiting rings (261) are respectively located on both sides of the top wall of the second accommodating cylinder (27), the second accommodating cylinder (27) is connected to one end of the discharge pipe (262), and the outer wall of the first accommodating cylinder (26) is fixedly connected to the top cover (12).

10. The salt lake lithium extraction electrodialysis device according to claim 2, wherein: The invention also includes a driving assembly (4), wherein the driving assembly (4) includes a motor (41), a driving shaft (42), a first gear (43) and a second gear (44), wherein the motor (41) is connected to the driving shaft (42), the driving shaft (42) is fixedly connected to the first gear (43), the first gear (43) is meshedly connected to the second gear (44), and the motor (41) is mounted on the outer wall of the cylinder (11) through a motor base (411).

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