Salt lake lithium extraction device

Abstract

The utility model relates to the technical field of salt lake electric de-intercalation lithium extraction equipment, and discloses a salt lake lithium extraction device which comprises a lithium extraction mechanism and a frame body, the lithium extraction mechanism comprises an ionic membrane, a connecting piece and two lithium extraction assemblies; according to the device, the lithium extraction operation is realized through the combination of the two lithium extraction assemblies and the ionic membrane, specifically, the lithium extraction operation can be carried out by respectively injecting cathode slurry and anode slurry into the liquid inlets of the two electrode frames and electrifying the tabs, the whole operation is very simple, and the lithium extraction assembly is divided into the electrode frames, the electrode plates and the tabs, so that the lithium extraction efficiency is greatly improved. When the ionic membrane or other components are damaged, the ionic membrane or other components can be disassembled and replaced only by loosening the connecting piece, the operation is very convenient, in addition, as the liquid guide groove is formed in the polar plate, the contact area between slurry and the ionic membrane can be increased during exchange, and the adsorption efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of salt lake electric deintercalation and lithium extraction equipment, in particular to a salt lake lithium extraction device. Background Art

[0002] At present, the technologies for extracting lithium from salt lakes mainly include precipitation, solvent extraction, membrane separation, adsorption and electrochemical deintercalation. Among them, the electrochemical deintercalation method mainly adopts the coupling method of mobile electrode electrosorption desalination and membrane separation technology, that is, lithium-rich liquid, lithium-rich materials and conductive agents are made into anode plasma, and lithium-containing stock solution, lithium-poor materials and conductive agents are made into cathode slurry. Through the electrosorption and desorption cycle of lithium-poor materials and lithium-rich materials, lithium ions in the lithium-containing stock solution are transferred to the lithium-rich liquid to achieve lithium ion enrichment.

[0003] At present, the devices that implement the electrochemical deintercalation method mainly use a structure in which an ion membrane is set in a box to separate the positive and negative electrode slurries. This structure is not convenient for maintenance. When the ion membrane or other components are damaged, the entire device needs to be dismantled for maintenance, which not only increases the difficulty of maintenance, but also delays working time. Utility Model Content

[0004] The utility model aims to provide a salt lake lithium extraction device which is not only convenient for disassembly and maintenance, but also convenient to use and simple to operate.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a salt lake lithium extraction device, comprising: a lithium extraction mechanism and a frame; the lithium extraction mechanism can be detachably installed on the frame; the lithium extraction mechanism comprises an ion membrane, a connector and two lithium extraction components; the lithium extraction component comprises a pole frame, a pole plate and a pole ear, the pole frame has a mounting groove on one side of a first direction, the pole frame also has a liquid inlet and a liquid outlet, the pole plate can be detachably installed in the mounting groove, the two pole frames are connected by the connector, and the mounting grooves of the two pole frames are jointly enclosed to form a lithium extraction cavity, the ion membrane is arranged between the two pole plates, and the ion membrane divides the lithium extraction cavity into two chambers, the pole plate has a liquid guide groove on one side facing the ion membrane, one end of the liquid guide groove is connected to the liquid inlet, and the other end is connected to the liquid outlet, the pole ear can be detachably installed on the pole frame, and is electrically connected to the pole plate.

[0006] Optionally, the pole frame has a plurality of the liquid inlets and the plurality of the liquid outlets, and the plurality of the liquid inlets and the plurality of the liquid outlets are arranged in a one-to-one correspondence, and the pole plate has a plurality of the liquid guide grooves, and one end of the plurality of the liquid guide grooves is respectively connected to the plurality of the liquid inlets in a one-to-one correspondence, and the other end of the plurality of the liquid guide grooves is respectively connected to the plurality of the liquid outlets in a one-to-one correspondence.

[0007] Optionally, the lithium extraction component also includes multiple liquid inlet pipes and multiple control valves, the multiple liquid inlet pipes are respectively connected to the multiple liquid inlets, the multiple control valves are respectively arranged on the multiple liquid inlet pipes, and the control valves are used to control the flow rate of the slurry in the liquid inlet pipes.

[0008] Optionally, a collecting tank is further included, and the lithium extraction component also includes a liquid outlet pipe, one end of the liquid outlet pipe is connected to the liquid outlet, and the other end is connected to the collecting tank.

[0009] Optionally, the liquid inlet is located at the bottom end of the pole frame, and the liquid outlet is located at the top end of the pole frame.

[0010] Optionally, the liquid guiding groove extends in an S shape.

[0011] Optionally, it includes a plurality of the lithium extraction mechanisms, which are sequentially arranged on the frame along the first direction, and any two adjacent lithium extraction mechanisms are fitted together, and in any two adjacent lithium extraction mechanisms, the two contacting pole frames are connected as a whole, and the liquid inlets on the two pole frames are connected as a whole, and the liquid outlets on the two pole frames are also connected as a whole.

[0012] Optionally, the lithium extraction assembly further includes a caulking ring, a gap is left between the pole plate and the pole frame, and the caulking ring is laid in the gap.

[0013] Optionally, a side of the electrode plate facing away from the electrode frame is flush with a side of the electrode frame adjacent to the ion membrane in the first direction.

[0014] Optionally, the connecting member includes a connecting bolt and two pressure plates, wherein one of the pressure plates is arranged on the side of one of the pole frames away from the ion membrane, and the other pressure plate is arranged on the side of the other pole frame away from the ion membrane, one end of the connecting bolt is connected to one of the pressure plates, and the other end is connected to the other pressure plate, and the ion membrane and the two pole frames are clamped by tightening the connecting bolt.

[0015] Compared with the prior art, the salt lake lithium extraction device of the utility model embodiment has the beneficial effect that: the device realizes the lithium extraction operation by combining two lithium extraction components and an ion membrane. Specifically, the lithium extraction operation can be performed by respectively injecting cathode slurry and anode slurry into the liquid inlets of the two pole frames and energizing the pole ears. The whole operation is very simple. Moreover, since the lithium extraction component is separated into the pole frame, the pole plate and the pole ear, when the ion membrane or other components are damaged, only the connecting parts need to be loosened to complete the disassembly and replacement, which is very convenient. In addition, since the liquid guide groove is arranged on the pole plate, the contact area between the slurry and the ion membrane can be increased during the exchange, thereby improving the adsorption efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the main structure of the salt lake lithium extraction device according to an embodiment of the utility model;

[0017] Figure 2 It is a schematic diagram of the main structure of the lithium extraction mechanism of the embodiment of the utility model;

[0018] Figure 3 is a side view of the salt lake lithium extraction device according to an embodiment of the utility model;

[0019] Figure 4 It is an embodiment of the utility model Figure 3 Cross-sectional view in the A-A direction;

[0020] Figure 5 It is an embodiment of the utility model Figure 4 Enlarged view at B;

[0021] Figure 6 It is a schematic diagram of the main structure of the pole frame of the embodiment of the utility model;

[0022] Figure 7 It is a schematic diagram of the main structure of the electrode plate of an embodiment of the utility model;

[0023] Figure 8 It is a schematic diagram of the main structure of the frame of the embodiment of the utility model;

[0024] Fig. 9 It is an embodiment of the utility model Figure 8 Enlarged view at C.

[0025] In the figure, 1, lithium extraction mechanism; 11, ion membrane; 12, connecting piece; 121, connecting bolt; 122, pressing plate; 13, lithium extraction assembly; 131, pole frame; 1311, mounting groove; 1312, liquid inlet; 1313, liquid outlet; 132, pole plate; 1321, liquid guide groove; 133, pole ear; 134, liquid inlet pipe; 135, control valve; 136, liquid outlet pipe; 137, caulking ring; 2, frame; 21, overlapping part; 22, round steel; 3, collecting tank; X, first direction. DETAILED DESCRIPTION

[0026] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0027] In the description of the present invention, it should be understood that the terms "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 cannot be understood as a limitation on the present invention.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0029] like Figure 1 - Figure 6 As shown, a salt lake lithium extraction device according to an embodiment of the utility model comprises: a lithium extraction mechanism 1 and a frame 2; the lithium extraction mechanism 1 can be detachably mounted on the frame 2; the lithium extraction mechanism 1 comprises an ion membrane 11, a connector 12 and two lithium extraction components 13; the lithium extraction component 13 comprises a pole frame 131, a pole plate 132 and a pole ear 133, the pole frame 131 has a mounting groove 1311 on one side of the first direction X, the pole frame 131 also has a liquid inlet 1312 and a liquid outlet 1313, the pole plate 132 can be detachably mounted on the mounting groove 131 1, the two pole frames 131 are connected by a connecting piece 12, and the mounting grooves 1311 of the two pole frames 131 are jointly enclosed to form a lithium extraction chamber, the ion membrane 11 is arranged between the two pole plates 132, and the ion membrane 11 divides the lithium extraction chamber into two chambers; the pole plate 132 has a liquid guide groove 1321 on one side facing the ion membrane 11, one end of the liquid guide groove 1321 is connected to the liquid inlet 1312, and the other end is connected to the liquid outlet 1313, and the pole ear 133 is detachably installed on the pole frame 131 and is electrically connected to the pole plate 132.

[0030] Based on the above scheme, the device realizes the lithium extraction operation by combining two lithium extraction components 13 and the ion membrane 11. Specifically, the cathode slurry and the anode slurry are respectively injected into the liquid inlet 1312 of the two pole frames 131, and the pole ear 133 is energized to perform the lithium extraction operation. The whole operation is very simple. Moreover, since the lithium extraction component 13 is split into the pole frame 131, the pole plate 132 and the pole ear 133, when the ion membrane 11 or other components are damaged, only the connecting part 12 needs to be loosened to complete the disassembly and replacement, which is very convenient. In addition, since the liquid guide groove 1321 is set on the pole plate 132, the contact area between the slurry and the ion membrane 11 can be increased during the exchange, thereby improving the adsorption efficiency.

[0031] In some embodiments, the pole frame 131 is made of PVC material, which not only provides insulation but also reduces manufacturing costs.

[0032] In some embodiments, the electrode plate 132 is made of graphite.

[0033] like Figure 1 and Figure 6 As shown, in order to improve the adsorption efficiency, the pole frame 131 has a plurality of liquid inlets 1312 and a plurality of liquid outlets 1313, and the plurality of liquid inlets 1312 and the plurality of liquid outlets 1313 are arranged in a one-to-one correspondence, and the pole plate 132 has a plurality of liquid guide grooves 1321, and one end of the plurality of liquid guide grooves 1321 is respectively connected to the plurality of liquid inlets 1312 in a one-to-one correspondence, and the other end of the plurality of liquid guide grooves 1321 is respectively connected to the plurality of liquid outlets 1313 in a one-to-one correspondence. By arranging a plurality of liquid guide grooves 1321, the utilization rate of the surface of the pole plate 132 is increased as much as possible, thereby increasing the contact area between the slurry and the ion membrane 11 and improving the adsorption efficiency of the device.

[0034] like Figure 1 and Figure 2 As shown, for ease of use, the lithium extraction component 13 also includes a plurality of liquid inlet pipes 134 and a plurality of control valves 135. The plurality of liquid inlet pipes 134 are respectively connected to the plurality of liquid inlets 1312, and the plurality of control valves 135 are respectively arranged on the plurality of liquid inlet pipes 134. The control valve 135 is used to control the flow rate of the slurry in the liquid inlet pipes 134. During use, the number of liquid inlet pipes 134 to be opened and the flow rate of the slurry in the liquid inlet pipes 134 can be selected according to specific circumstances to avoid siltation and blockage.

[0035] like Figure 1 and Figure 2 As shown, it also includes a collecting tank 3, and the lithium extraction component 13 also includes a liquid outlet pipe 136. One end of the liquid outlet pipe 136 is connected to the liquid outlet 1313, and the other end is connected to the collecting tank 3. On the one hand, the slurry can be collected through the collecting tank 3, and on the other hand, the circulation of the slurry can be visually observed through the collecting tank 3 to determine whether blockage occurs.

[0036] like Figure 6 As shown, in order to improve the adsorption efficiency, the liquid inlet 1312 is located at the bottom of the pole frame 131, and the liquid outlet 1313 is located at the top of the pole frame 131. By adjusting the positions of the liquid inlet 1312 and the liquid outlet 1313, the flow direction of the slurry in the liquid guide groove 1321 is bottom-in and top-out, so as to ensure that the slurry can always be filled in the liquid guide groove 1321, thereby increasing the contact area between the slurry and the ion membrane 11 and improving the adsorption efficiency.

[0037] like Figure 7As shown, in order to improve the adsorption efficiency, the liquid guiding groove 1321 extends in an S shape, so that the liquid guiding groove 1321 can be spread on the electrode plate 132 as much as possible, thereby increasing the contact area between the slurry and the ion membrane 11 and improving the adsorption efficiency.

[0038] like Figure 7 As shown, in some embodiments, the corners of the liquid guiding groove 1321 are rounded to avoid dead zones, ensure that the slurry can pass smoothly, reduce the resistance to the slurry, and prevent accumulation.

[0039] like Figure 1 and Figure 5 As shown, in order to improve the adsorption efficiency, a plurality of lithium extraction mechanisms 1 are included, and the plurality of lithium extraction mechanisms 1 are sequentially arranged on the frame 2 along the first direction X, and any two adjacent lithium extraction mechanisms 1 are fitted with each other, and in any two adjacent lithium extraction mechanisms 1, the two contacting pole frames 131 are connected as a whole, and the liquid inlets 1312 on the two pole frames 131 are connected as a whole, and the liquid outlets 1313 on the two pole frames 131 are also connected as a whole. The adsorption efficiency is improved by arranging a plurality of lithium extraction mechanisms 1 to work together, and they do not affect each other. When one of the lithium extraction mechanisms 1 fails, the remaining lithium extraction mechanisms 1 can still work normally. In addition, by connecting the two contacting pole frames 131 as a whole, the space occupied by the device is reduced and the integration of the device is improved.

[0040] like Figure 2 As shown, the lithium extraction assembly 13 also includes a caulking ring 137. A gap is left between the pole plate 132 and the pole frame 131. The caulking ring 137 is laid in the gap. Due to the processing accuracy of the pole plate 132 and the pole frame 131, a gap is easily left after the pole plate 132 and the pole frame 131 are assembled. The caulking ring 137 is laid in the gap to achieve sealing.

[0041] like Figure 2 As shown, in some embodiments, in order to facilitate production and assembly, the outer contour of the caulking ring 137 is adapted to the inner contour of the mounting groove 1311, the inner contour of the caulking ring 137 is adapted to the outer contour of the electrode plate 132, and a connecting port corresponding to the liquid inlet 1312 and the liquid outlet 1313 is provided on the caulking ring 137.

[0042] like Figure 5 As shown, in order to improve the adsorption efficiency, the side of the electrode plate 132 facing away from the electrode frame 131 is flush with the side of the electrode frame 131 adjacent to the ion membrane 11 in the first direction X, so that the slurry in the liquid guide groove 1321 can stick to the ion membrane 11, so as to reduce the ion migration distance, increase the reaction rate, and prevent the slurry from flowing out of the gap between the ion membrane 11 and the electrode plate 132, thereby ensuring that the slurry flows along the liquid guide groove 1321.

[0043] Specifically, the pole plate 132 is detachably connected to the mounting groove 1311 by thin-sheet bolts. The thin-sheet bolts are arranged on the side of the pole plate 132 away from the pole frame 131 . By tightening the thin-sheet bolts, a pre-tightening force can be generated on the pole plate 132 , and the pressing force will make the pole plate 132 flush with the pole frame 131 .

[0044] like Figure 1 As shown, in order to ensure that the slurry flows along the liquid guiding groove 1321, the connecting member 12 includes a connecting bolt 121 and two pressure plates 122, wherein one pressure plate 122 is arranged on the side of one of the pole frames 131 away from the ion membrane 11, and the other pressure plate 122 is arranged on the side of the other pole frame 131 away from the ion membrane 11, one end of the connecting bolt 121 is connected to one of the pressure plates 122, and the other end is connected to the other pressure plate 122, and the ion membrane 11 and the two pole frames 131 are clamped by tightening the connecting bolt 121, so that the liquid guiding groove 1321 is tightly attached to the ion membrane 11, thereby ensuring that the slurry flows along the liquid guiding groove 1321.

[0045] Optionally, a partition is provided between the pressing plate 122 and the pole frame 131 , and the partition is used to isolate the pressing plate 122 from contact with the salt solution to prevent the pressing plate 122 from being corroded.

[0046] In some embodiments, the pressure plate 122 is made of carbon steel, and the partition is made of PVC.

[0047] like Figure 8 and Fig. 9 As shown, in some embodiments, in order to facilitate the disassembly of the lithium extraction mechanism 1 from the frame 2, the frame 2 includes a lap portion 21, and lifting ears are arranged on both sides of the pole frame 131, and the lifting ears are overlapped on the lap portion 21. In some embodiments, a round steel 22 is further arranged between the lifting ear and the lap portion 21, and the round steel 22 extends along the first direction X. By arranging the round steel 22, the lifting ear can slide out of the lap portion 21 by sliding along the first direction X, and the surface contact between the lifting ear and the lap portion 21 is converted into line contact, the friction force is greatly reduced, the pulling is convenient, and the use is labor-saving.

[0048] The working process of the utility model is:

[0049] 1. Prepare iron phosphate particles + conductive carbon black particles + salt lake brine as cathode slurry, and lithium iron phosphate particles + conductive carbon black particles + lithium-rich liquid as anode slurry;

[0050] 2. Pass the anode slurry into the liquid inlet 1312 of one pole frame 131, pass the cathode slurry into the liquid inlet 1312 of the other pole frame 131, and pass direct current through the pole ear 133;

[0051] 3. The current is transmitted to the electrode plate 132 through the electrode ear 133, and then transmitted to the slurry through the conductive carbon black particles in the liquid guide groove 1321. The iron phosphate obtains an electron and absorbs lithium ions from the salt lake brine to become lithium iron phosphate. The lithium iron phosphate loses an electron and releases lithium ions into the lithium-rich liquid.

[0052] 4. After a period of time, the cathode and anode slurries are extracted, and the mud cake is filtered out by pressure. After the mud cake is crushed and finely ground, the iron phosphate particles are added back to the cathode, and the lithium iron phosphate particles are added back to the anode. The clear liquid obtained by filtering the cathode slurry is returned to the cathode, and the slurry obtained by filtering the anode is returned to the anode, and the power is continued;

[0053] 5. Repeat the cycle several times until the lithium concentration in the lithium-rich liquid reaches a certain level, then extract the lithium-rich liquid and filter it to obtain a clear liquid, that is, a clear liquid with a high lithium content.

[0054] In summary, the embodiment of the utility model provides a salt lake lithium extraction device, which realizes the lithium extraction operation by combining two lithium extraction components 13 and an ion membrane 11. Specifically, the lithium extraction operation can be performed by respectively injecting cathode slurry and anode slurry into the liquid inlet 1312 of the two pole frames 131, and energizing the pole ear 133. The whole operation is very simple, and since the lithium extraction component 13 is split into the pole frame 131, the pole plate 132 and the pole ear 133, when the ion membrane 11 or other components are damaged, only the connecting part 12 needs to be loosened to complete the disassembly and replacement, which is very convenient. In addition, since the liquid guide groove 1321 is set on the pole plate 132, the contact area between the slurry and the ion membrane 11 can be increased during the exchange, thereby improving the adsorption efficiency.

[0055] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A device for extracting lithium from a salt lake, characterized in that: include: A lithium extraction mechanism (1) and a frame (2); The lithium extraction mechanism (1) can be detachably mounted on the frame (2); The lithium extraction mechanism (1) comprises an ion membrane (11), a connecting piece (12) and two lithium extraction components (13); The lithium extraction assembly (13) comprises a pole frame (131), a pole plate (132) and a pole ear (133); the pole frame (131) has a mounting groove (1311) on one side in a first direction (X); the pole frame (131) also has a liquid inlet (1312) and a liquid outlet (1313); the pole plate (132) is detachably mounted in the mounting groove (1311); the two pole frames (131) are connected by the connecting member (12); and the mounting grooves (1311) of the two pole frames (131) are jointly enclosed to form a lithium extraction cavity; the ion membrane (11) is arranged between the two pole plates (132); and the ion membrane (11) divides the lithium extraction cavity into two chambers; The electrode plate (132) has a liquid conducting groove (1321) on one side facing the ion membrane (11); one end of the liquid conducting groove (1321) is connected to the liquid inlet (1312), and the other end is connected to the liquid outlet (1313); the electrode ear (133) is detachably mounted on the electrode frame (131) and is electrically connected to the electrode plate (132).

2. The salt lake lithium extraction device according to claim 1, characterized in that: The pole frame (131) has a plurality of liquid inlets (1312) and a plurality of liquid outlets (1313), and the plurality of liquid inlets (1312) and the plurality of liquid outlets (1313) are arranged in a one-to-one correspondence; the pole plate (132) has a plurality of liquid guide grooves (1321), and one end of the plurality of liquid guide grooves (1321) is respectively connected to the plurality of liquid inlets (1312) in a one-to-one correspondence, and the other end of the plurality of liquid guide grooves (1321) is respectively connected to the plurality of liquid outlets (1313) in a one-to-one correspondence.

3. The salt lake lithium extraction device according to claim 2, characterized in that: The lithium extraction component (13) further comprises a plurality of liquid inlet pipes (134) and a plurality of control valves (135), wherein the plurality of liquid inlet pipes (134) are respectively connected to the plurality of liquid inlets (1312), and the plurality of control valves (135) are respectively arranged on the plurality of liquid inlet pipes (134), and the control valves (135) are used to control the flow rate of the slurry in the liquid inlet pipes (134).

4. The salt lake lithium extraction device according to claim 1, characterized in that: It also includes a collecting tank (3), and the lithium extraction component (13) also includes a liquid outlet pipe (136), one end of the liquid outlet pipe (136) is connected to the liquid outlet (1313), and the other end is connected to the collecting tank (3).

5. The salt lake lithium extraction device according to claim 1, characterized in that: The liquid inlet (1312) is located at the bottom end of the pole frame (131), and the liquid outlet (1313) is located at the top end of the pole frame (131).

6. The salt lake lithium extraction device according to claim 1, characterized in that: The liquid guiding groove (1321) extends in an S shape.

7. The salt lake lithium extraction device according to claim 1, characterized in that: It comprises a plurality of the lithium extraction mechanisms (1), wherein the plurality of the lithium extraction mechanisms (1) are sequentially arranged on the frame (2) along the first direction (X), any two adjacent lithium extraction mechanisms (1) are fitted to each other, and in any two adjacent lithium extraction mechanisms (1), the two contacting pole frames (131) are connected as a whole, and the liquid inlets (1312) on the two pole frames (131) are connected as a whole, and the liquid outlets (1313) on the two pole frames (131) are also connected as a whole.

8. The salt lake lithium extraction device according to claim 1, characterized in that: The lithium extraction assembly (13) further comprises a caulking ring (137), a gap is left between the pole plate (132) and the pole frame (131), and the caulking ring (137) is laid in the gap.

9. The salt lake lithium extraction device according to claim 1, characterized in that: A side of the electrode plate (132) facing away from the electrode frame (131) is flush with a side of the electrode frame (131) adjacent to the ion membrane (11) in the first direction (X).

10. The salt lake lithium extraction device according to claim 1, characterized in that: The connecting member (12) comprises a connecting bolt (121) and two pressing plates (122), wherein one of the pressing plates (122) is arranged on a side of one of the pole frames (131) away from the ion membrane (11), and the other pressing plate (122) is arranged on a side of the other pole frame (131) away from the ion membrane (11), one end of the connecting bolt (121) is connected to one of the pressing plates (122), and the other end is connected to the other pressing plate (122), and the ion membrane (11) and the two pole frames (131) are clamped by tightening the connecting bolt (121).

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