Pole plate and flowing electrode electrochemical lithium extraction device with same

Abstract

The utility model discloses a polar plate and a flowing electrode electrochemical lithium extraction device with the polar plate. The polar plate comprises a plate body, the plate body is provided with a feeding channel, a discharging channel and at least one runner face, the runner face is provided with a flowing groove, the flowing groove comprises a feeding area, a flow dividing area and a discharging area which are sequentially communicated from bottom to top, the feeding channel is communicated with the feeding area, and the discharging channel is communicated with the discharging area; and each flow guide block extends in the vertical direction and is in a wave shape, the flow guide blocks are arranged in the flow dividing area and divide the flow dividing area into a plurality of wave-shaped flow channels, and the upper ends and the lower ends of the wave-shaped flow channels communicate with the discharging area and the feeding area correspondingly. The utility model can effectively solve the problem of slurry deposition in the membrane stack.

Description

Technical Field

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

[0002] In the electrochemical lithium extraction technology from salt lakes by the method of electrochemical deintercalation, the working principle of lithium-ion batteries is applied to the selective lithium extraction from salt lake brines. Through the behaviors of "electrochemical adsorption" and "electrochemical desorption" of lithium intercalation and deintercalation into and out of the active material, the high-selectivity, low-cost, green extraction and enrichment of lithium in salt lake brines are realized, and thus a lithium-rich solution with low impurity content is obtained.

[0003] At present, the electrochemical lithium extraction technology from salt lakes by the method of electrochemical deintercalation mainly uses the electro-deintercalation equipment in the form of plate electrode coating, that is, the active material is coated on the anode and cathode plates. Its disadvantages are: the contact area between the coating material and the salt lake brine is small, and the lithium extraction efficiency is low. In addition, once the coating material is damaged or fails, the process of re-coating the active material is very cumbersome. As a kind of the electrochemical lithium extraction technology from salt lakes by the method of electrochemical deintercalation, the flow electrode capacitive deionization (FCDI) technology couples the flow electrode with the ion exchange membrane, and has the ability of infinite adsorption and long-term operation. However, when applying the FCDI technology with the plate electrodes of the existing technology, after the slurry continuously runs in the system, it is easy to deposit in the membrane stack and block the flow channels of the membrane stack. At the same time, its current density is also small, and the infinite adsorption ability and long-term operation ability of the FCDI technology cannot be well reflected. Summary of the Utility Model

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. For this reason, the utility model provides a plate electrode and a flow electrode electrochemical lithium extraction device with the same, which can effectively solve the problem of slurry deposition in the membrane stack.

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

[0006] In the first aspect, an embodiment of the utility model provides a plate electrode, including:

[0007] A plate body, which is provided with a feed channel, a discharge channel and at least one flow channel surface. The flow channel surface is provided with flow grooves. The flow grooves include a feed zone, a diversion zone and a discharge zone which are sequentially communicated from bottom to top. The feed channel is communicated with the feed zone, and the discharge channel is communicated with the discharge zone;

[0008] A plurality of guide blocks, each of the guide blocks extends in the up-and-down direction and is in a waveform. The plurality of guide blocks are arranged in the diversion zone and divide the diversion zone into a plurality of waveform flow channels. The upper and lower ends of the waveform flow channels are respectively communicated with the discharge zone and the feed zone.

[0009] The utility model has at least the following beneficial effects: The slurry enters the flow tank from the feed channel and can flow in the flow tank. When used in combination with a diaphragm capable of ion exchange and applying the flow electrode capacitive deionization technology, the purpose of lithium extraction can be achieved. Since the diversion block is in a waveform, the multiple waveform flow channels formed can guide the slurry to flow dispersedly in the flow tank. The slurry flows in a larger range in the flow tank of the electrode plate. When the slurry flows in the waveform flow channels, the resistance it receives is smaller, which will not cause the slurry to accumulate and lead to the blockage problem of the waveform flow channels. At the same time, the flow track of the slurry flowing along the waveform flow channel is in a waveform, the flow track is longer, the fluidity is higher, the contact area between the slurry and the electrode plate is larger, and the current density will also increase accordingly, improving the adsorption capacity and long-term operation capacity when using the flow electrode capacitive deionization technology for lithium extraction.

[0010] As a further improvement of the above technical solution, there are two flow channel surfaces, and the two flow channel surfaces are respectively located on the opposite side surfaces of the plate body. The feed areas of the two flow channel surfaces are respectively communicated with the feed channel, and the discharge areas of the two flow channel surfaces are respectively communicated with the discharge channel. With such a setting, the flow tanks of the two flow channel surfaces do not affect each other, can respectively guide the flow of the slurry, and can reduce the pipeline layout of the external feeding equipment and discharging equipment.

[0011] As a further improvement of the above technical solution, the electrode plate further includes:

[0012] The first piers are arranged in the feed area and the discharge area, and a plurality of the first piers are respectively arranged in the feed area and the discharge area.

[0013] When the slurry enters the feed area and the discharge area, it can contact and collide with the first piers, increasing the contact area between the slurry and the electrode plate, thereby increasing the current density of the slurry. Moreover, the first piers in the feed area can make the slurry flow evenly into each waveform flow channel, making the flow of the slurry in the flow tank more dispersed and further avoiding the situation of blockage.

[0014] As a further improvement of the above technical solution, the lower end surface of each first pier is a diversion surface, and the diversion surface is inclined downward along the vertical direction. The inclined diversion surface can guide the slurry to flow into each waveform flow channel, making the slurry dispersed evenly in the flow tank and avoiding the situation of accumulation and blockage.

[0015] As a further improvement of the above technical solution, the diversion block has wave valleys sunken on both sides, and the electrode plate further includes:

[0016] The second piers are arranged in the waveform flow channels and are located at the wave valley positions of the diversion block.

[0017] Due to the provision of the second pier, when the slurry enters the corrugated flow channel, the slurry comes into contact with the second pier, which can increase the contact area between the slurry and the electrode plate, and further increase the current density.

[0018] As a further improvement of the above technical solution, the plate body is further provided with an air inlet channel and an air outlet channel. The air inlet channel is communicated with the feeding area, and the air outlet channel is communicated with the discharging area. With such a setting, without disassembling the flow-electrode electrochemical lithium extraction device with the electrode plate of this embodiment, the corrugated flow channel inside the electrode plate can be directly cleaned through the air inlet channel, and the cleaning liquid can flow out from the air outlet channel. It is also possible to perform air-blowing operation into the flow tank through the air inlet channel to deal with some relatively viscous slurries, increase the fluidity of the slurries, and further avoid the situation of accumulation and blockage of the slurries inside the electrode plate.

[0019] As a further improvement of the above technical solution, a plurality of the air inlet channels and the air outlet channels are respectively provided. The plurality of air inlet channels are symmetrically arranged on both sides of the feeding channel, and the plurality of air outlet channels are symmetrically arranged on both sides of the discharging channel. The provision of a plurality of air inlet channels and a plurality of air outlet channels can improve the efficiency of the cleaning liquid entering and leaving the flow tank, thereby improving the cleaning effect on the flow tank inside the electrode plate, and can also increase the flow rate of the gas entering the flow tank, thereby further increasing the fluidity of the slurries.

[0020] As a further improvement of the above technical solution, the electrode plate further includes a sealant. The plate body is further provided with a caulking groove, and the caulking groove is arranged on the outer periphery of the flow tank. The sealant is arranged in the caulking groove. When the electrode plate is used in combination with a separator capable of ion exchange, the sealant seals the gap between the electrode plate and the separator, enabling the plate body and the separator to be closely attached to each other and preventing the leakage of the slurry during use.

[0021] In a second aspect, an embodiment of the present invention provides a flow-electrode electrochemical lithium extraction device, including at least one separator and at least two electrode plates as described in any one of the above technical solutions. The separator is arranged between the flow channel surfaces of two adjacent electrode plates and covers two adjacent flow tanks. The separator and two adjacent electrode plates jointly form an electrolysis structure.

[0022] Due to the corrugated flow channel in the flow tank, the slurry can be subjected to less resistance in the diversion area, increasing the fluidity of the slurry and not easily causing blockage problems caused by slurry deposition. At the same time, the contact area between the slurry and the electrode plate increases, and the current density also increases accordingly. When using the FCDI technology to achieve lithium extraction, it has good adsorption capacity and long-term operation ability.

[0023] As a further improvement of the above technical solution, a plurality of electrolysis structures are provided. The plurality of electrolysis structures are arranged along a first direction. The electrode plates at both ends are single-sided electrode plates, and the electrode plates between the two single-sided electrode plates are double-sided electrode plates. Each of the two single-sided electrode plates is provided with a flow channel surface, and the flow channel surfaces of the two single-sided electrode plates face each other. Each double-sided electrode plate is provided with two flow channel surfaces, and the two flow channel surfaces of the same double-sided electrode plate face the two single-sided electrode plates respectively.

[0024] The diaphragm and the adjacent electrode plates on both sides together form an electrolysis structure. Since the electrode plates include two single-sided electrode plates and at least one double-sided electrode plate, there are a plurality of electrolysis structures in the flowing electrode electrochemical lithium extraction device. The plurality of electrolysis structures are arranged side by side and do not affect each other, and the FCDI technology can be applied simultaneously for lithium extraction, improving the efficiency of lithium extraction and increasing the reaction throughput. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly describe the drawings required for the description of the embodiments. Obviously, the described drawings are only a part of the embodiments of the present invention, not all of the embodiments. Those skilled in the art can also obtain other design solutions and drawings based on these drawings without creative efforts.

[0026] Figure 1 is the overall structural schematic diagram of the electrode plate in the embodiment of the present invention;

[0027] Figure 2 is the front view of the electrode plate in the embodiment of the present invention;

[0028] Figure 3 is the overall structural schematic diagram of the flowing electrode electrochemical lithium extraction device in the embodiment of the present invention;

[0029] Figure 4 is the exploded view of the structure of the flowing electrode electrochemical lithium extraction device in the embodiment of the present invention.

[0030] Reference numerals: 100, electrode plate; 101, single-sided electrode plate; 102, double-sided electrode plate; 110, plate body; 111, caulking groove; 120, flow groove; 121, feeding area; 122, shunting area; 123, discharging area; 130, guiding block; 131, corrugated flow channel; 140, first pier; 150, second pier; 160, feeding channel; 170, discharging channel; 180, air inlet channel; 190, air outlet channel; 200, diaphragm; 300, pressing plate; 400, partition plate. Detailed Embodiments

[0031] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where like or similar reference numerals denote like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary only for explaining the present utility model and should not be construed as limiting the present utility model.

[0032] In the description of the present utility model, with regard to the orientation description, for example, the orientation or positional relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as limiting the present utility model.

[0033] In the description of the present utility model, the meaning of "several" is one or more, the meaning of "multiple" is two or more, "greater than", "less than", "exceeding", etc. are understood as not including the present number, and "above", "below", "within", etc. are understood as including the present number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0034] In the description of the present utility model, unless otherwise clearly defined, words such as "set", "installed", "connected", etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above words in the present utility model in combination with the specific content of the technical solution.

[0035] Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present utility model. Each technical feature in the present utility model can be combined interactively on the premise of not conflicting with each other.

[0036] Referring to Figure 1 and Figure 2 , in a first aspect, an electrode plate 100 is proposed in an embodiment of the present utility model. It is applied to a flowing electrode electrochemical lithium extraction device, provides a flow channel for the slurry, realizes lithium extraction by using FCDI technology, and can avoid the accumulation and blockage of the slurry, increase the fluidity of the slurry, and increase the current density.

[0037] In this embodiment, the electrode plate 100 includes a plate body 110 and a flow guiding block 130. Among them, the plate body 110 is provided with at least one flow channel surface, and the flow channel surface is provided with a flow groove 120. The flow groove 120 provides a flow space for the slurry. It includes a feeding area 121, a flow splitting area 122, and a discharging area 123 in sequence from bottom to top. An inlet channel 160 and an outlet channel 170 are also provided on the plate body 110. The inlet channel 160 communicates with the feeding area 121, and the outlet channel 170 communicates with the discharging area 123. During use, the slurry enters the flow groove 120 from the inlet channel 160, flows from bottom to top, and leaves the flow groove 120 via the outlet channel 170.

[0038] A plurality of flow guiding blocks 130 are provided. The plurality of flow guiding blocks 130 are all arranged in the flow splitting area 122. Each flow guiding block 130 extends in the up and down direction and is in a waveform. By providing the flow guiding blocks 130, the flow splitting area 122 can be divided into a plurality of waveform flow channels 131. The upper end and the lower end of the waveform flow channel 131 are both open. Among them, the lower end of the waveform flow channel 131 communicates with the feeding area 121, and the upper end of the waveform flow channel 131 communicates with the discharging area 123.

[0039] It can be understood that since the flow guiding blocks 130 are in a waveform, the formed plurality of waveform flow channels 131 can guide the slurry to flow dispersedly in the flow groove 120. The slurry flows in a larger range in the flow groove 120 of the electrode plate 100. When the slurry flows in the waveform flow channel 131, the resistance it receives is smaller, which will not cause the slurry to accumulate and cause the problem of blockage of the waveform flow channel 131. At the same time, the flow track of the slurry flowing along the waveform flow channel 131 is in a waveform, the flow track is longer, the fluidity is higher, and the current density will also increase correspondingly, which is beneficial to improving the adsorption capacity and the long-term operation capacity.

[0040] The electrode plate 100 can be a single-sided electrode plate 101 or a double-sided electrode plate 102. In the single-sided electrode plate 101, there is only one flow channel surface of the plate body 110. The single-sided electrode plate 101 is generally applied to both ends of the electrode unit of the entire flow electrode electrochemical lithium extraction device. In the double-sided electrode plate 102, there are two flow channel surfaces of the plate body 110. The two flow channel surfaces are respectively arranged on the opposite side surfaces of the plate body 110. The flow grooves 120 of the two flow channel surfaces respectively provide a flow space for the slurry. The double-sided electrode plate 102 is generally applied in the middle of the electrode unit. After a plurality of double-sided electrode plates 102 are arranged in sequence, the two single-sided electrode plates 101 are respectively located at both ends of the overall structure formed by the plurality of double-sided electrode plates 102.

[0041] In some embodiments, two flow channel surfaces are provided on the same electrode plate 100, which is a double-sided electrode plate 102. Its feed channel 160 can communicate with the feed areas 121 of the two flow channel surfaces, and the discharge channel 170 can communicate with the discharge areas 123 of the two flow channel surfaces. Through one feed channel 160, it is possible to supply materials to the flow grooves 120 on both sides of the electrode plate 100. Through one discharge channel 170, it is possible to guide the discharge of the flow grooves 120 on both sides of the electrode plate 100.

[0042] It can be understood that the feed channel 160 is connected to an external feeding device, and the feeding device supplies materials to the feed channel 160 through a feed pipeline to achieve the feeding of the flow groove 120; the discharge channel 170 is connected to an external discharging device, and the discharging device extracts the slurry from the flow groove 120 through a discharge pipeline to achieve the discharge of the slurry in the flow groove 120. Through the arrangement of the above embodiments, only one feed channel 160 and one discharge channel 170 need to be provided on the electrode plate 100, which can reduce the arrangement of the feed pipelines in the feeding device and the discharge pipelines in the discharging device. While ensuring stable feeding and discharging, the effect of reducing pipeline arrangement can be achieved, and the structure of the entire flow electrode electrochemical lithium extraction device can be simplified.

[0043] In this embodiment, the feed channel 160 and the discharge channel 170 are respectively arranged to extend in the up and down direction, and both are straight channels. The inlet end of the feed channel 160 is arranged downward, and the outlet end of the discharge channel 170 is arranged upward. With such an arrangement, the slurry can quickly enter the flow groove 120 and can be smoothly discharged from the flow groove 120, avoiding the situation of blockage at the inlet and outlet of the flow groove 120 and ensuring the fluidity of the slurry.

[0044] In some embodiments, the electrode plate 100 further includes a first pier 140. The first pier 140 is arranged in the feed area 121 and the discharge area 123, and a plurality of first piers 140 are respectively arranged in the feed area 121 and the discharge area 123. The first pier 140 can make the slurry flow evenly into each corrugated flow channel 131, and at the same time can increase the contact area between the slurry and the electrode plate 100, thereby increasing the current density.

[0045] In some embodiments, the shape and size of each first pier 140 are the same. The first pier 140 can be in the shape of a cylinder, a prism, etc. In some embodiments, the lower surface of each first pier 140 is a diversion surface, and the diversion surface is arranged to incline downward in the vertical direction for guiding the slurry to flow into each corrugated flow channel 131.

[0046] In this embodiment, each first pier 140 is in a triangular prism shape. The side edges of the triangular prism-shaped first pier 140 extend along the depth direction of the flow channel 120, and its bottom surface faces the opening direction of the flow channel 120. It can be understood that the bottom surface of the triangular prism-shaped first pier 140 is a triangle. In this embodiment, one of the angles of the triangle faces downward, and the two side surfaces forming the angle facing downward are the flow guiding surfaces. After the slurry enters the feeding area 121, it collides with the first pier 140 and can flow along the flow guiding surfaces and be dispersed into each corrugated flow channel 131.

[0047] It can be understood that the first piers 140 are uniformly arranged in the feeding area 121 and the discharging area 123. Specifically, in the feeding area 121 and the discharging area 123, four rows of first piers 140 are respectively arranged in the up-down direction, and the adjacent two rows of first piers 140 are arranged staggeredly.

[0048] In this embodiment, the adjacent side surfaces of the first pier 140 are transitioned by an arc. With such a setting, it is beneficial to guide the slurry to flow dispersedly.

[0049] In some embodiments, the electrode plate 100 further includes a second pier 150. The second pier 150 is arranged in the corrugated flow channel 131, and the second pier 150 is arranged in a shape-matching manner with the flow guiding block 130. It can be understood that the flow guiding block 130 is in a corrugated shape and has wave troughs recessed on both sides. The second pier 150 is arranged in the corrugated flow channels 131 on both sides of the flow guiding block 130, specifically arranged at the wave trough positions of the flow guiding block 130.

[0050] With the setting of the second pier 150, when the slurry enters the corrugated flow channel 131, the slurry collides and contacts with the second pier 150, which can increase the contact area between the slurry and the electrode plate 100 and further increase the current density.

[0051] The shape of the second pier 150 is not specifically limited herein.

[0052] In some embodiments, the second pier 150 extends in the up-down direction and is in a straight line shape. Each flow guiding block 130 is arranged in parallel, each second pier 150 is arranged in parallel, the second piers 150 are arranged in multiple rows in the up-down direction, and the multiple second piers 150 in each row of second piers 150 are at the same horizontal height.

[0053] The shape of the second pier 150 can also be the same as that of the first pier 140. In some embodiments, the lower surface of the second pier 150 is also provided with a flow guiding surface that slopes downward in the vertical direction.

[0054] In some embodiments, the plate body 110 is further provided with an air inlet channel 180 and an air outlet channel 190, the air inlet channel 180 is connected to the feed area 121, and the air outlet channel 190 is connected to the discharge area 123. It is understandable that, in this way, the wave-shaped flow channel 131 inside the electrode plate 100 can be cleaned directly through the air inlet channel 180 without disassembling the flow electrode electrochemical lithium extraction device having the electrode plate 100 of this embodiment, and the cleaning liquid can flow out from the air outlet channel 190. The flow tank 120 can also be ventilated through the air inlet channel 180 to deal with some relatively viscous slurries and increase the fluidity of the slurry.

[0055] In some embodiments, there are multiple inlet channels 180 and multiple outlet channels 190, and the multiple inlet channels 180 are symmetrically arranged on both sides of the feed channel 160, and the multiple outlet channels 190 are correspondingly arranged on both sides of the outlet channel 170. In this embodiment, there are two inlet channels 180 and two outlet channels 190.

[0056] It can be understood that providing multiple air inlet channels 180 and multiple air outlet channels 190 can improve the efficiency of the cleaning liquid entering and exiting the flow groove 120, thereby improving the cleaning effect of the flow groove 120 inside the electrode plate 100, and can also increase the flow rate of gas entering the flow groove 120, thereby further increasing the fluidity of the slurry.

[0057] It is understandable that the air inlet channel 180 can be connected to an external air inlet pipe or a cleaning liquid inlet pipe, and air is supplied to the air inlet channel 180 through the air inlet pipe or cleaning liquid is supplied to the air inlet pipe through the cleaning liquid inlet pipe. The air outlet channel 190 can be connected to an external air outlet pipe or a cleaning liquid discharge pipe, and the gas in the flow tank 120 is discharged to the air outlet pipe through the air outlet channel 190, and the cleaning liquid in the flow tank 120 can be discharged to the cleaning liquid discharge pipe through the air outlet channel 190 for subsequent recovery.

[0058] In some embodiments, the plate body 110 of the electrode plate 100 is provided with two flow channel surfaces. On the same plate body 110, each air inlet channel 180 is connected to the flow grooves 120 of the two flow channel surfaces, and each air outlet channel 190 is connected to the flow grooves 120 of the two flow surfaces. This can reduce the arrangement of external air intake pipes, exhaust pipes or cleaning liquid inlet pipes and cleaning liquid discharge pipes while ensuring the cleaning effect or air intake effect of the flow grooves 120 on both sides.

[0059] In some embodiments, the plate body 110 is further provided with a caulking groove 111, which is arranged at the periphery of the flow groove 120, and a sealant is arranged in the caulking groove 111. It is understood that referring to Figure 3 and Figure 4, when using the electrode plate 100, multiple plate bodies 110 are often arranged in sequence. A separator 200 is provided between two adjacent electrode plates 100, and the flow channel 120 is arranged to open towards the separator 200. In order to ensure that the slurry in the flow channel 120 does not leak out, it is necessary to make the plate body 110 closely fit with the separator 200. By setting the sealant, it can avoid the unevenness of the plate body 110 caused by processing problems from affecting the close fit between the plate body 110 and the separator 200, and further prevent the slurry from leaking out.

[0060] In this embodiment, the electrode plate 100 is made of graphite material.

[0061] During use, the slurry enters the feeding area 121 of the flow channel 120 from the feeding channel 160 at the lower end of the plate body 110. In the feeding area 121, the slurry collides with and contacts the first pier 140 in the feeding area 121. The slurry is dispersed and flows upward through each corrugated flow channel 131. Under the guiding action of the corrugated flow channel 131, the slurry can flow upward smoothly, avoiding the situation of siltation and blockage, and can increase the contact area between the slurry and the electrode plate 100, increasing the current density. During the process of the slurry flowing in the corrugated flow channel 131, the slurry will contact the second pier 150 in the corrugated flow channel 131. Since the second pier 150 extends in the vertical direction, its resistance to the upward flow of the slurry is small, and it will not cause the slurry to siltate and block, and can further increase the contact area between the slurry and the electrode plate 100, increasing the current density. The upward flowing slurry flows from the corrugated flow channel 131 to the discharging area 123. The slurry collides with and contacts the first pier 140 in the discharging area 123, causing the slurry to flow dispersedly, further avoiding siltation and blockage, and increasing the contact area between the slurry and the electrode plate 100, increasing the current density. Finally, the slurry is discharged through the discharging channel 170 to complete lithium extraction.

[0062] During the whole process of lithium extraction, air can be blown into the flow channel 120 through the air inlet channel 180 to increase the fluidity of the slurry. After the lithium extraction is completed, by injecting the cleaning liquid through the air inlet channel 180, the inside of the flow channel 120 can be cleaned without disassembling the entire flow electrode electrochemical lithium extraction device.

[0063] On the other hand, the embodiment of the present utility model provides a flow electrode electrochemical lithium extraction device. Refer to Figure 3 and Figure 4, including a diaphragm 200 and electrode plates 100 as proposed in any one of the embodiments of the first aspect. Among them, there are at least two electrode plates 100 and at least one diaphragm 200. The flow channels 120 of two adjacent electrode plates 100 are arranged with their openings facing each other. The diaphragm 200 is arranged between two adjacent electrode plates 100. The two side surfaces of the diaphragm 200 are respectively connected to the flow channel surfaces of the two electrode plates 100 and can cover the two flow channels 120 with their openings facing each other. The diaphragm 200 and two adjacent electrode plates 100 jointly form an electrolysis structure.

[0064] It can be understood that the diaphragm 200 is attached to the flow channel surface of the electrode plate 100, which can close the opening of the flow channel 120 and prevent the slurry from leaking out.

[0065] Since there are waveform flow channels 131 in the flow channel 120, the slurry can be subjected to less resistance in the diversion area 122, increasing the fluidity of the slurry and not easily causing blockage problems caused by slurry accumulation. At the same time, the contact area between the slurry and the electrode plate 100 increases, and the current density also increases accordingly. When using the FCDI technology to realize lithium extraction, it has good adsorption capacity and long-term operation ability.

[0066] In some embodiments, the flow guiding blocks 130 in the flow channel 120 are attached to the diaphragm 200, which can separately guide each waveform flow channel 131, further increasing the contact area between the slurry and the electrode plate 100 and increasing the current density.

[0067] In some embodiments, there are two electrode plates 100, and both two electrode plates 100 are single-sided electrode plates 101. The flow channels 120 of the two single-sided electrode plates 101 are arranged with their openings facing each other. The two single-sided electrode plates 101 and the diaphragm 200 jointly form an electrolysis structure.

[0068] In some embodiments, there are multiple electrolysis structures, and the multiple electrolysis structures are arranged along the first direction. By jointly reacting and processing the slurry through the multiple electrolysis structures, the lithium extraction efficiency can be improved.

[0069] In some embodiments, multiple electrolysis structures are formed by arranging multiple single-sided electrode plates 101. Two single-sided electrode plates 101 form a group. The flow channel surfaces of the single-sided electrode plates 101 in the same group are arranged facing each other. The diaphragm 200 is arranged between the single-sided electrode plates 101 in the same group. A group of single-sided electrode plates 101 and the diaphragm 200 jointly form an electrolysis structure. However, with such an arrangement, it requires a large amount of space and the utilization rate of the electrode plate 100 is relatively low.

[0070] In this embodiment, a plurality of electrolysis structures are formed by arranging two single-sided electrode plates 101 and several double-sided electrode plates 102. The electrode plates 100 at both ends are single-sided electrode plates 101. One flow channel surface is provided on the single-sided electrode plate 101, and the other electrode plates 100 are double-sided electrode plates 102, which have two flow channel surfaces.

[0071] The flow channel surfaces of the two single-sided electrode plates 101 are arranged facing each other, that is, the flow grooves 120 of the two single-sided electrode plates 101 open facing each other. The double-sided electrode plates 102 are arranged in sequence between the two single-sided electrode plates 101. The two flow channel surfaces of the same double-sided electrode plate 102 are respectively arranged facing the flow channel surfaces of the two single-sided electrode plates 101. The number of diaphragms 200 is one less than the total number of electrode plates 100, that is, one more than the number of double-sided electrode plates 102. The diaphragm 200 can separate two adjacent flow channel surfaces.

[0072] It can be understood that the electrode plates 100 on both sides of the diaphragm 200 are the anode electrode plate 100 and the cathode electrode plate 100 respectively. Ear tabs are provided on the electrode plates 100. The ear tabs on the cathode electrode plate 100 and the ear tabs on the anode electrode plate 100 are arranged staggeredly, that is, they are not on the same side of the flow electrode electrochemical lithium extraction device. The ear tab of the cathode electrode plate 100 is used to connect the cathode, and the ear tab of the anode electrode plate 100 is connected to the anode. The diaphragm 200 and the electrode plates 100 on both sides together form an electrolysis structure. In this embodiment, the diaphragm 200 is a non-conductive fiber woven fabric or an anion membrane, and its function is to physically isolate the slurries in the cathode electrode plate 100 and the anode electrode plate 100 and realize the directional movement of anions in the slurry.

[0073] It can be understood that the number of double-sided electrode plates 102 is not specifically limited here. Since there are multiple electrolysis structures in the flow electrode electrochemical lithium extraction device, the multiple electrolysis structures are arranged side by side and do not affect each other, and the FCDI technology can be applied simultaneously for lithium extraction to improve the efficiency of lithium extraction.

[0074] In this embodiment, the electrode plate 100 has a first pier 140 and a second pier 150. The edges and corners of the contact surfaces of the first pier 140 and the second pier 150 with the diaphragm 200 are processed by a grinding process, which can prevent the first pier 140 and the second pier 150 from damaging the diaphragm 200.

[0075] In some embodiments, partition plates 400 and pressing plates 300 are provided at both ends of the flow electrode electrochemical lithium extraction device. Among them, the partition plate 400 is made of polyvinyl chloride material to isolate the pressing plate 300 and the single-sided electrode plate 101, avoid contact between the high-concentration salt solution and the pressing plate 300, and prevent the pressing plate 300 from being corroded. The pressing plate 300 is made of aluminum alloy, which is light in texture and high in strength, and is used to press each electrolysis structure to prevent liquid leakage.

[0076] In this embodiment, a hydraulic press is used to press the electrode plates 100, so that the distance between the separator 200 and two adjacent electrode plates 100 is nearly zero, forming an electrolytic structure with a nearly zero electrode spacing.

[0077] In some embodiments, the flow-through electrode electrochemical lithium extraction device further includes a frame, on which a groove is provided. The pressing plate 300, the separator 400, the plate body 110 of the electrode plate 100, and the separator 200 are of the same size. The pressing plate 300, the separator 400, the electrode plate 100, and the separator 200 are directly placed at the groove of the frame. After being placed in the placement order proposed in the above embodiment and then pressed by a hydraulic press, there is no need to open holes in the pressing plate 300 and lock them with bolts, which is convenient for operation and easy to install.

[0078] During use, slurry is supplied to the feed channels 160 of each electrode plate 100, and the slurry can extract lithium in one or more electrolytic structures. Under the guiding action of the waveform flow channel 131, the slurry can flow smoothly upward, avoiding the situation of siltation and blockage, and can increase the contact area between the slurry and the electrode plate 100, increasing the current density. The slurry after lithium extraction electrolysis flows out through the discharge channels 170 of each electrode plate 100.

[0079] The above has specifically described the preferred embodiments of the present invention, but the present invention is not limited to the described embodiments. Those skilled in the art can also make various equivalent variations or substitutions without departing from the spirit of the present invention, and these equivalent variations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A plate (100), characterized in that, Comprising: A plate body (110) is provided with a feed channel (160), a discharge channel (170) and at least one flow channel surface. The flow channel surface is provided with flow grooves (120). The flow grooves (120) include a feed area (121), a diversion area (122) and a discharge area (123) that are sequentially connected from bottom to top. The feed channel (160) is communicated with the feed area (121), and the discharge channel (170) is communicated with the discharge area (123). A plurality of guide blocks (130), each of the guide blocks (130) extends in the up and down direction and is in a waveform. The plurality of guide blocks (130) are arranged in the diversion area (122) and divide the diversion area (122) to form a plurality of waveform flow channels (131). The upper and lower ends of the waveform flow channels (131) are respectively communicated with the discharge area (123) and the feed area (121).

2. The plate (100) according to claim 1, characterized in that, There are two of the flow channel surfaces, and the two flow channel surfaces are respectively located on the opposite side surfaces of the plate body (110). The feed areas (121) of the two flow channel surfaces are respectively communicated with the feed channel (160), and the discharge areas (123) of the two flow channel surfaces are respectively communicated with the discharge channel (170).

3. The plate (100) according to claim 1, characterized in that, The electrode plate (100) further comprises: First piers (140) are arranged in the feed area (121) and the discharge area (123), and a plurality of the first piers (140) are respectively arranged in the feed area (121) and the discharge area (123).

4. The plate (100) according to claim 3, characterized in that, The lower end surface of each of the first piers (140) is a guide surface, and the guide surface is inclined downward in the vertical direction.

5. The plate (100) according to claim 1, characterized in that, The guide block (130) has wave troughs recessed on both sides. The electrode plate (100) further comprises: Second piers (150) are arranged in the waveform flow channels (131) and are located at the wave trough positions of the guide blocks (130).

6. The electrode plate (100) according to claim 1, characterized in that, The plate body (110) is further provided with an air inlet channel (180) and an air outlet channel (190). The air inlet channel (180) is communicated with the feed area (121), and the air outlet channel (190) is communicated with the discharge area (123).

7. The electrode plate (100) according to claim 6, characterized in that, There are a plurality of the air inlet channels (180) and the air outlet channels (190) respectively. The plurality of air inlet channels (180) are symmetrically arranged on both sides of the feed channel (160), and the plurality of air outlet channels (190) are symmetrically arranged on both sides of the discharge channel (170).

8. The electrode plate (100) according to claim 1, characterized in that, The electrode plate (100) further comprises a sealant. The plate body (110) is further provided with a caulking groove (111). The caulking groove (111) is arranged on the outer periphery of the flow groove (120), and the sealant is arranged in the caulking groove (111).

9. A flow electrode electrochemical lithium extraction device, characterized in that, Comprising at least one diaphragm (200) and at least two electrode plates (100) as described in any one of claims 1 to 8. The diaphragm (200) is arranged between the flow channel surfaces of two adjacent electrode plates (100) and covers two adjacent flow grooves (120). The diaphragm (200) and two adjacent electrode plates (100) jointly form an electrolysis structure.

10. The flow electrode electrochemical lithium extraction device according to claim 9, characterized in that, A plurality of the electrolysis structures are provided, and the plurality of electrolysis structures are arranged in a first direction. The electrode plates (100) at both ends are respectively single-sided electrode plates (101), and the electrode plates (100) between the two single-sided electrode plates (101) are double-sided electrode plates (102). Each of the two single-sided electrode plates (101) is provided with a flow channel surface, and the flow channel surfaces of the two single-sided electrode plates (101) face each other. Each double-sided electrode plate (102) is provided with two flow channel surfaces, and the two flow channel surfaces of the same double-sided electrode plate (102) are respectively arranged to face the two single-sided electrode plates (101).

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