Lithium extraction device and lithium extraction equipment

Abstract

The utility model discloses a lithium extraction device and lithium extraction equipment, and relates to the technical field of salt lake lithium extraction. The lithium extraction device comprises an outer frame and a plurality of electric de-embedding unit grooves. A containing space is defined by the outer frame, and the multiple electric disengagement unit grooves are formed in the containing space. Each electric de-intercalation unit tank comprises a tank body, an ion exchange membrane, a cathode plate and an anode plate, the tank body is provided with a containing cavity, the ion exchange membrane divides the containing cavity into a cathode chamber and an anode chamber, the cathode plate is arranged in the cathode chamber, the anode plate is arranged in the anode chamber, and the tank body is provided with a first liquid inlet pipe and a first liquid outlet pipe which are communicated with the cathode chamber respectively; and a second liquid inlet pipe and a second liquid outlet pipe which are respectively communicated with the anode chamber are arranged. According to the lithium extraction device provided by the invention, through the design of the plurality of electric de-intercalation unit grooves, the maintenance difficulty and the shutdown duration are reduced, the high driving rate of the lithium extraction device is ensured, and meanwhile, the process parameters of each electric de-intercalation unit groove can be independently controlled, so that the quality of the lithium-rich liquid is favorably improved.

Description

Technical Field

[0001] The present application relates to the technical field of lithium extraction from salt lakes, and in particular to a lithium extraction device and equipment. Background Art

[0002] With the rapid development of the new energy industry, lithium-ion batteries have gradually taken a leading position in the industry, and lithium mineral resources play a vital role in the supply chain of new energy. Compared with lithium extraction from ores, lithium extraction from salt lakes has the advantages of rich mineral resources, low lithium extraction costs, and less environmental pollution.

[0003] In the related technology, the lithium extraction device uses an electric deintercalation tank to extract lithium from lithium-containing salt lake water, seawater, salt pan brine, wastewater and other lithium extraction solutions to obtain lithium-rich liquid products. This can avoid the damage to the landform caused by the traditional salt pan method of lithium extraction, which is of great significance to the protection of salt lake landforms. However, when the electric deintercalation tank of the lithium extraction device fails, the equipment needs to be shut down for maintenance, which is difficult to repair and requires a long downtime. At the same time, it is difficult to control the process parameters during the lithium extraction process, which is not conducive to the quality of the lithium-rich liquid product. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a lithium extraction device and lithium extraction equipment, aiming to solve the technical problems in the prior art of low start-up rate of lithium extraction devices and difficulty in controlling process parameters during lithium extraction.

[0005] To achieve the above objectives, the technical solutions adopted in this application are as follows:

[0006] In a first aspect, an embodiment of the present application provides a lithium extraction device, comprising:

[0007] An outer frame, defining a receiving space; and

[0008] A plurality of electrical de-embedding unit slots are arranged in the accommodation space;

[0009] Wherein, each of the electric deintercalation unit cells comprises a cell body, an ion exchange membrane, a cathode plate and an anode plate, the cell body has a receiving cavity, the ion exchange membrane divides the receiving cavity into a cathode chamber and an anode chamber, the cathode plate is arranged in the cathode chamber, the anode plate is arranged in the anode chamber, the cell body is provided with a first liquid inlet pipe and a first liquid outlet pipe respectively connected to the cathode chamber, and is provided with a second liquid inlet pipe and a second liquid outlet pipe respectively connected to the anode chamber;

[0010] In the first working state, the first liquid inlet pipe and the first liquid outlet pipe are respectively used to connect to the brine circulation device, and the second liquid inlet pipe and the second liquid outlet pipe are respectively used to connect to the lithium-rich liquid circulation device; in the second working state, the first liquid inlet pipe and the first liquid outlet pipe are respectively used to connect to the lithium-rich liquid circulation device, and the second liquid inlet pipe and the second liquid outlet pipe are respectively used to connect to the brine circulation device.

[0011] In one embodiment of the first aspect, the first liquid inlet pipe and the first liquid outlet pipe are arranged far apart from each other, the second liquid inlet pipe and the second liquid outlet pipe are arranged far apart from each other, and the first liquid inlet pipe and the first liquid outlet pipe are arranged on different sides of the trough body, and the second liquid inlet pipe and the second liquid outlet pipe are arranged on different sides of the trough body.

[0012] In one embodiment of the first aspect, the first liquid inlet pipe is located below the cathode plate, the first liquid outlet pipe is located above the cathode plate, the second liquid inlet pipe is located below the anode plate, and the second liquid outlet pipe is located above the anode plate.

[0013] In one embodiment of the first aspect, each of the electric deintercalation unit slots further includes a first liquid baffle plate and a second liquid baffle plate, the first liquid baffle plate being arranged in the cathode chamber and below the cathode plate, the second liquid baffle plate being arranged in the anode chamber and below the anode plate, the first liquid baffle plate and the bottom wall of the cathode chamber defining a first buffer cavity, and defining a first overflow gap with the side wall of the cathode chamber, the first liquid inlet pipe being located at the first buffer cavity position, the second liquid baffle plate and the bottom wall of the anode chamber defining a second buffer cavity, and defining a second overflow gap with the side wall of the anode chamber, and the second liquid inlet pipe being located at the second buffer cavity position.

[0014] In one embodiment of the first aspect, each of the electric deintercalation unit slots further includes a third liquid baffle plate and a fourth liquid baffle plate, the third liquid baffle plate being arranged in the cathode chamber and above the cathode plate, the fourth liquid baffle plate being arranged in the anode chamber and above the anode plate, the third liquid baffle plate and the top wall of the cathode chamber defining a third buffer chamber, and defining a third overflow gap with the side wall of the cathode chamber, the first liquid outlet pipe being located at the third buffer chamber position, the fourth liquid baffle plate and the top wall of the anode chamber defining a fourth buffer chamber, and defining a fourth overflow gap with the side wall of the anode chamber, and the second liquid outlet pipe being located at the fourth buffer chamber position.

[0015] In one embodiment of the first aspect, the cathode plate has a negative electrode ear, the anode plate has a positive electrode ear, and each of the electrical deintercalation unit cells further includes a first busbar and a second busbar, wherein the first busbar is electrically connected to the negative electrode ear, and the second busbar is electrically connected to the positive electrode ear.

[0016] In a second aspect, an embodiment of the present application further provides a lithium extraction device, comprising:

[0017] The lithium extraction device according to any one of the above embodiments;

[0018] A brine circulation device, comprising a brine tank, a first brine pipeline and a second brine pipeline, wherein the brine tank is used to store the lithium solution to be extracted and is connected between the first brine pipeline and the second brine pipeline, and a first circulation pump is provided at the first brine pipeline;

[0019] A lithium-rich liquid circulation device, comprising a lithium-rich liquid tank, a first lithium-rich liquid pipeline and a second lithium-rich liquid pipeline, wherein the lithium-rich liquid tank is used to store an electrolyte solution and is connected between the first lithium-rich liquid pipeline and the second lithium-rich liquid pipeline, and a second circulation pump is provided at the first lithium-rich liquid pipeline;

[0020] a first switching device, which is respectively connected to the first brine pipeline, the first lithium-rich liquid pipeline, the first liquid inlet pipe of each of the electric deintercalation unit tanks, and the second liquid inlet pipe of each of the electric deintercalation unit tanks; and

[0021] a second switching device, which is respectively connected with the second brine pipeline, the second lithium-rich liquid pipeline, the first liquid outlet pipe of each of the electric deintercalation unit tanks, and the second liquid outlet pipe of each of the electric deintercalation unit tanks;

[0022] Among them, the second switching device cooperates with the first switching device to realize the alternating switching of the lithium extraction equipment between the first working state and the second working state.

[0023] In one embodiment of the second aspect, the first switching device includes a first pipeline, a second pipeline, a third pipeline and a fourth pipeline, the first pipeline is connected to the first liquid inlet pipe of each of the electric deintercalation unit slots, the second pipeline is connected to the second liquid inlet pipe of each of the electric deintercalation unit slots, the third pipeline and the fourth pipeline are both connected between the first pipeline and the second pipeline, the fourth pipeline is connected to the first brine pipeline, the third pipeline is connected to the first lithium-rich liquid pipeline, the third pipeline is respectively provided with a first switching valve and a second switching valve, the connecting position of the first lithium-rich liquid pipeline and the third pipeline is located between the first switching valve and the second switching valve, the fourth pipeline is provided with a third switching valve and a fourth switching valve, and the connecting position of the first brine pipeline and the fourth pipeline is located between the third switching valve and the fourth switching valve.

[0024] In one embodiment of the second aspect, a first drain valve is disposed at the first pipeline, and a second drain valve is disposed at the second pipeline.

[0025] In one embodiment of the second aspect, the second switching device includes a fifth pipeline, a sixth pipeline, a seventh pipeline and an eighth pipeline, the fifth pipeline is connected to the first liquid outlet pipe of each of the electrical deintercalation unit slots, the sixth pipeline is connected to the second liquid outlet pipe of each of the electrical deintercalation unit slots, the seventh pipeline and the eighth pipeline are both connected between the fifth pipeline and the sixth pipeline, the seventh pipeline is connected to the second brine pipeline, the eighth pipeline is connected to the second lithium-rich liquid pipeline, a fifth switching valve and a sixth switching valve are respectively provided at the seventh pipeline, the connecting position of the second brine pipeline and the seventh pipeline is located between the fifth switching valve and the sixth switching valve, the seventh switching valve and the eighth switching valve are provided at the eighth pipeline, and the connecting position of the second lithium-rich liquid pipeline and the eighth pipeline is located between the seventh switching valve and the eighth switching valve.

[0026] The beneficial effects of this application are:

[0027] The present application provides a lithium extraction device, comprising an outer frame and a plurality of electric deintercalation unit cells arranged in a receiving space of the frame, each of the electric deintercalation unit cells comprising a cell body, an ion exchange membrane, a cathode plate and an anode plate, the cell body having a receiving cavity, the ion exchange membrane dividing the receiving cavity into a cathode chamber and an anode chamber, the cathode plate being arranged in the cathode chamber, and the anode plate being arranged in the anode chamber, on this basis, a first liquid inlet pipe and a first liquid outlet pipe respectively connected to the cathode chamber are arranged on the cell body of each electric deintercalation unit cell, and a second liquid inlet pipe and a second liquid outlet pipe respectively connected to the anode chamber are arranged on the cell body of each electric deintercalation unit cell.

[0028] In this way, through the arrangement of multiple electric deintercalation unit cells, each electric deintercalation unit cell can independently extract lithium from the lithium solution to be extracted. In this way, when an electric deintercalation unit cell fails, only the faulty electric deintercalation unit cell needs to be repaired, and other electric deintercalation unit cells can operate normally without being affected, thereby reducing the maintenance difficulty and downtime of the lithium extraction device and ensuring a high start-up rate of the lithium extraction device. At the same time, through the design of multiple electric deintercalation unit cells, the process parameters of each electric deintercalation unit cell can be individually controlled, which is beneficial to improving the quality of the lithium-rich solution.

[0029] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the following specifically cites preferred embodiments and describes them in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 A schematic diagram of the three-dimensional exploded structure of a lithium extraction device in some embodiments of the present application is shown;

[0032] Figure 2 A schematic structural diagram of a lithium extraction device from one perspective after the outer frame is omitted in some embodiments of the present application is shown;

[0033] Figure 3 Shows Figure 2 Schematic diagram of the cross-sectional structure of the lithium extraction device at AA after omitting the outer frame;

[0034] Figure 4 Shows Figure 3 The structural diagram of part B;

[0035] Figure 5 A schematic diagram of the structure of lithium extraction equipment in some embodiments of the present application is shown.

[0036] Description of main component symbols:

[0037] 1000-lithium extraction equipment; 100-lithium extraction device; 110-outer frame; 111-first fastening plate; 112-second fastening plate; 113-threaded pull rod; 114-washer; 115-nut; 120-electro-deintercalation unit tank; 121-tank body; 1211-cathode chamber; 1212-anode chamber; 122-ion exchange membrane; 123-cathode plate; 1231-negative electrode ear; 124-anode plate; 1241-positive electrode ear; 125-first water distribution network; 126-second water distribution network; 1271-first liquid inlet pipe; 1 272-first liquid outlet pipe; 1273-second liquid inlet pipe; 1274-second liquid outlet pipe; 1281-first liquid retaining plate; 12811-first buffer chamber; 12812-first overflow slit; 1282-second liquid retaining plate; 12821-second buffer chamber; 12822-second overflow slit; 1283-third liquid retaining plate; 12831-third buffer chamber; 12832-third overflow slit; 1284-fourth liquid retaining plate; 12841-fourth buffer chamber; 12842-fourth overflow slit; 1291-first confluence plate; 1292-second manifold; 1293-titanium screw; 200-brine circulation device; 210-brine tank; 220-first brine pipeline; 230-second brine pipeline; 240-first circulation pump; 250-third drain valve; 260-first discharge valve; 300-lithium-rich liquid circulation device; 310-lithium-rich liquid tank; 320-first lithium-rich liquid pipeline; 330-second lithium-rich liquid pipeline; 340-second circulation pump; 350-fourth drain valve; 360-second discharge valve; 400-first switching device; 41 0-first pipeline; 420-second pipeline; 430-third pipeline; 440-fourth pipeline; 450-first switching valve; 460-second switching valve; 470-third switching valve; 480-fourth switching valve; 491-first drain valve; 492-second drain valve; 500-second switching device; 510-fifth pipeline; 520-sixth pipeline; 530-seventh pipeline; 540-eighth pipeline; 550-fifth switching valve; 560-sixth switching valve; 570-seventh switching valve; 580-eighth switching valve. DETAILED DESCRIPTION

[0038] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0039] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like 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 application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0040] 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0041] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0042] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0043] like Figure 1 and Figure 5 As shown, in the first aspect, an embodiment of the present application provides a lithium extraction device 100, which relates to the technical field of lithium extraction from salt lakes, and is mainly used in a lithium extraction device 1000 for extracting lithium from a lithium solution to be extracted to obtain a lithium-rich solution with a high lithium concentration.

[0044] Combination Figures 1 to 3As shown, the lithium extraction device 100 provided in this embodiment includes an outer frame 110 and a plurality of electrical deintercalation unit slots 120 .

[0045] The outer frame 110 defines a receiving space, and a plurality of electrical deintercalation unit cells 120 are disposed in the receiving space. Each electrical deintercalation unit cell 120 includes a cell body 121, an ion exchange membrane 122, a cathode plate 123, and an anode plate 124. The cell body 121 has a receiving cavity, and the ion exchange membrane 122 separates the receiving cavity into a cathode chamber 1211 and an anode chamber 1212. The cathode plate 123 is disposed in the cathode chamber 1211, and the anode plate 124 is disposed in the anode chamber 1212. The cell body 121 is provided with a first liquid inlet pipe 1271 and a first liquid outlet pipe 1272 respectively connected to the cathode chamber 1211, and is provided with a second liquid inlet pipe 1273 and a second liquid outlet pipe 1274 respectively connected to the anode chamber 1212.

[0046] In the first working state, the first liquid inlet pipe 1271 and the first liquid outlet pipe 1272 are respectively used to connect to the brine circulation device 200 so that the lithium solution to be extracted circulates between the cathode chamber 1211 and the brine circulation device 200, and the second liquid inlet pipe 1273 and the second liquid outlet pipe 1274 are respectively used to connect to the lithium-rich liquid circulation device 300 so that the electrolyte solution circulates between the anode chamber 1212 and the lithium-rich liquid circulation device 300.

[0047] In the second working state, the first liquid inlet pipe 1271 and the first liquid outlet pipe 1272 are respectively used to connect the lithium-rich liquid circulation device 300 so that the electrolyte solution circulates between the cathode chamber 1211 and the lithium-rich liquid circulation device 300, and the second liquid inlet pipe 1273 and the second liquid outlet pipe 1274 are respectively used to connect the brine circulation device 200 so that the lithium solution to be extracted circulates between the anode chamber 1212 and the brine circulation device 200.

[0048] It should be noted that the main component of the cathode plate 123 can be FePO4, and the main component of the anode plate 124 can be LiFePO4. When the lithium extraction operation is performed, the lithium extraction device 100 is controlled to enter the first working state, so that the brine circulation device 200 injects the lithium solution to be extracted (including but not limited to lithium-containing salt lake water, seawater, salt field old brine, wastewater, etc.) into the cathode chamber 1211, and the lithium-rich liquid circulation device 300 injects the electrolyte solution (such as clean water) into the anode chamber 1212. A DC power supply is used to apply voltage to the cathode plate 123 and the anode plate 124 (the cathode plate 123 is connected to the negative pole of the power supply, and the anode plate 124 is connected to the positive pole of the power supply). At this time, the LiFePO4 of the anode plate 124 loses electrons, so that the positive divalent iron in the ion exchange membrane 122 is oxidized to positive trivalent iron, thereby converting Li +The FePO4 in the cathode plate 123 obtains electrons, which reduces the positive trivalent iron in the ion exchange membrane 122 to positive divalent iron, thereby forcing the Li in the lithium solution to be extracted to + Enter the FePO4 lattice to maintain the electrical neutrality of the material (FePO4 is converted back to LiFePO4). At the same time, the anions in the cathode chamber 1211 enter the anode chamber 1212 through the ion exchange membrane 122 to maintain the charge balance of the entire system, completing an electrical deintercalation cycle. Then, the lithium extraction device 100 is controlled to enter the second working state, so that the brine circulation device 200 injects the lithium solution to be extracted into the anode chamber 1212, and the lithium-rich liquid circulation device 300 injects the electrolyte solution into the cathode chamber 1211, and the DC power supply is switched between positive and negative electrodes to achieve Li + The separation from other elements in the lithium solution to be extracted and the conversion back into iron phosphate by the ion exchange membrane 122 are repeated.

[0049] It can be understood that by controlling the lithium extraction device 100 to switch alternately between the first working state and the second working state, the lithium in the lithium solution to be extracted can be continuously enriched in the electrolyte solution to obtain a lithium-rich solution.

[0050] In the related technology, the lithium extraction device uses an electric deintercalation tank to extract lithium from lithium-containing salt lake water, seawater, salt pan brine, wastewater and other lithium extraction solutions to obtain lithium-rich liquid products. This can avoid the damage to the landform caused by the traditional salt pan method of lithium extraction, which is of great significance to the protection of salt lake landforms. However, when the electric deintercalation tank of the lithium extraction device fails, the equipment needs to be shut down for maintenance, which is difficult to repair and requires a long downtime. At the same time, it is difficult to control the process parameters during the lithium extraction process, which is not conducive to the quality of the lithium-rich liquid product.

[0051] It can be understood that the lithium extraction device 100 provided in this embodiment includes an outer frame 110 and a plurality of electrical deintercalation unit cells 120 arranged in the frame accommodating space, each of the electrical deintercalation unit cells 120 includes a cell body 121, an ion exchange membrane 122, a cathode plate 123 and an anode plate 124, the cell body 121 has a accommodating cavity, the ion exchange membrane 122 separates the accommodating cavity into a cathode chamber 1211 and an anode chamber 1212, the cathode plate 123 is arranged in the cathode chamber 1211, and the anode plate 124 is arranged in the anode chamber 1212. On this basis, the cell body 121 of each electrical deintercalation unit cell 120 is provided with a first liquid inlet pipe 1271 and a first liquid outlet pipe 1272 respectively connected to the cathode chamber 1211, and the cell body 121 of each electrical deintercalation unit cell 120 is provided with a second liquid inlet pipe 1273 and a second liquid outlet pipe 1274 respectively connected to the anode chamber 1212. In this way, through the arrangement of multiple electric deintercalation unit cells 120, each electric deintercalation unit cell 120 can independently extract lithium from the lithium solution to be extracted. In this way, when a fault occurs in the electric deintercalation unit cell 120, only the faulty electric deintercalation unit cell 120 needs to be repaired, and other electric deintercalation unit cells 120 can operate normally without being affected, thereby reducing the maintenance difficulty and downtime of the lithium extraction device 100 and ensuring a high start-up rate of the lithium extraction device 100. At the same time, through the design of multiple electric deintercalation unit cells 120, the process parameters (such as feed and discharge pressure, flow rate, etc.) of each electric deintercalation unit cell 120 can be individually controlled, which is beneficial to improving the quality of the lithium-rich solution.

[0052] Combination Figure 1 and Figure 2 As shown, in one embodiment, the first liquid inlet pipe 1271 and the first liquid outlet pipe 1272 are arranged far apart, the second liquid inlet pipe 1273 and the second liquid outlet pipe 1274 are arranged far apart, and the first liquid inlet pipe 1271 and the first liquid outlet pipe 1272 are arranged on different sides of the tank body 121, and the second liquid inlet pipe 1273 and the second liquid outlet pipe 1274 are arranged on different sides of the tank body 121. In this way, the residence time of the lithium solution to be extracted and the electrolyte solution in the containing cavity of the tank body 121 can be increased, so that the lithium in the lithium solution to be extracted can be fully enriched in the electrolyte solution to obtain a lithium-rich solution with a higher lithium content.

[0053] Combination Figure 2 and Figure 3 As shown, further, the first liquid inlet pipe 1271 is located below the cathode plate 123 , the first liquid outlet pipe 1272 is located above the cathode plate 123 , the second liquid inlet pipe 1273 is located below the anode plate 124 , and the second liquid outlet pipe 1274 is located above the anode plate 124 .

[0054] In this embodiment, the lithium extraction device 100 is described in the first working state as an example, by locating the first liquid inlet pipe 1271 below the cathode plate 123, and locating the first liquid outlet pipe 1272 above the cathode plate 123, so that the lithium solution to be extracted input from the first liquid inlet pipe 1271 into the cathode chamber 1211 can gradually flow from bottom to top to the first liquid outlet pipe 1272 for output, so that, under the action of gravity, the scouring intensity of the lithium solution to be extracted on the surface coating of the cathode plate 123 is reduced, thereby extending the service life of the cathode plate 123. Similarly, by locating the second liquid inlet pipe 1273 below the anode plate 124, and locating the second liquid outlet pipe 1274 above the anode plate 124, the scouring intensity of the electrolyte solution on the surface coating of the anode plate 124 is reduced, thereby extending the service life of the anode plate 124.

[0055] like Figure 3 As shown, in one embodiment, each electric deintercalation unit slot 120 also includes a first liquid baffle plate 1281 and a second liquid baffle plate 1282, the first liquid baffle plate 1281 is arranged in the cathode chamber 1211 and is located below the cathode plate 123, the second liquid baffle plate 1282 is arranged in the anode chamber 1212 and is located below the anode plate 124, the first liquid baffle plate 1281 and the bottom wall of the cathode chamber 1211 define a first buffer cavity 12811, and define a first overflow gap 12812 with the side wall of the cathode chamber 1211, the first liquid inlet pipe 1271 is located at the first buffer cavity 12811, the second liquid baffle plate 1282 and the bottom wall of the anode chamber 1212 define a second buffer cavity 12821, and define a second overflow gap 12822 with the side wall of the anode chamber 1212, and the second liquid inlet pipe 1273 is located at the second buffer cavity 12821.

[0056] In this embodiment, the lithium extraction device 100 is in the second working state as an example for explanation. By setting the first liquid baffle plate 1281 at the lower position of the cathode plate 123, and arranging the first liquid inlet pipe 1271 at the position of the first buffer cavity 12811, the electrolyte solution input into the cathode chamber 1211 from the first liquid inlet pipe 1271 will first pass through the buffering effect of the first buffer cavity 12811 and then overflow through the cathode plate 123 through the first overflow slit 12812 to complete the electrochemical reaction, which can avoid the electrolyte solution from directly scouring the surface coating of the cathode plate 123 and extend the service life of the cathode plate 123. At the same time, the first liquid baffle plate 1281 can also play a flow-equalizing effect, so that the electrolyte solution can evenly contact the surface of the cathode plate 123 after passing through the first liquid baffle plate 1281, which is conducive to improving the quality of the lithium-rich liquid. For the second liquid baffle plate 1282, the effect it plays is similar to that of the first liquid baffle plate 1281, and it will not be repeated here.

[0057] Combination Figure 3 and Figure 4As shown, in one embodiment, each electric deintercalation unit slot 120 also includes a third liquid baffle plate 1283 and a fourth liquid baffle plate 1284, the third liquid baffle plate 1283 is arranged in the cathode chamber 1211 and is located above the cathode plate 123, the fourth liquid baffle plate 1284 is arranged in the anode chamber 1212 and is located above the anode plate 124, the third liquid baffle plate 1283 and the top wall of the cathode chamber 1211 define a third buffer cavity 12831, and define a third overflow seam 12832 with the side wall of the cathode chamber 1211, the first liquid outlet pipe 1272 is located at the third buffer cavity 12831, the fourth liquid baffle plate 1284 and the top wall of the anode chamber 1212 define a fourth buffer cavity 12841, and define a fourth overflow seam 12842 with the side wall of the anode chamber 1212, and the second liquid outlet pipe 1274 is located at the fourth buffer cavity 12841.

[0058] In this embodiment, the lithium extraction device 100 is in the first working state as an example for explanation. By setting the third liquid baffle plate 1283 above the cathode plate 123 and arranging the first liquid outlet pipe 1272 at the third buffer chamber 12831, the lithium solution to be extracted enters the third buffer chamber 12831 through the third overflow slit 12832 after the electrochemical reaction with the cathode plate 123, and then is output from the first liquid outlet pipe 1272. In this process, the flow rate of the lithium solution to be extracted output from the first liquid outlet pipe 1272 is reduced, so that the flow rate distribution of the lithium solution to be extracted in the electric deintercalation unit tank 120 is more uniform, thereby improving the lithium extraction efficiency and the quality of the lithium-rich solution. For the fourth liquid baffle plate 1284, the effect it plays is similar to that of the third liquid baffle plate 1283, which will not be repeated here.

[0059] like Figure 4 As shown, in one embodiment, the cathode plate 123 has a negative electrode ear 1231, the anode plate 124 has a positive electrode ear 1241, and each electrical deintercalation unit cell 120 also includes a first busbar 1291 and a second busbar 1292, the first busbar 1291 is electrically connected to the negative electrode ear 1231, and the second busbar 1292 is electrically connected to the positive electrode ear 1241.

[0060] It should be noted that the first busbar 1291 and the second busbar 1292 are respectively used to connect to a DC power supply. It is understandable that, by setting the first busbar 1291 and the second busbar 1292, the current flow area is increased, so that the current density distribution of the cathode plate 123 and the anode plate 124 is more uniform, which is conducive to the electrochemical reaction, thereby improving the lithium extraction efficiency and the quality of the lithium-rich solution.

[0061] Continue reading Figure 4Furthermore, the first busbar 1291 and the negative pole ear 1231 of the cathode plate 123, and the second busbar 1292 and the positive pole ear 1241 of the anode plate 124 are connected by titanium screws 1293 to achieve a stable electrical connection between the first busbar 1291 and the cathode plate 123, and a stable electrical connection between the second busbar 1292 and the anode plate 124, thereby facilitating the subsequent electrochemical reaction.

[0062] like Figure 1 As shown, in one embodiment, the outer frame 110 includes a first fastening plate 111, a second fastening plate 112, a threaded rod 113, a washer 114 and a nut 115. The first fastening plate 111 and the second fastening plate 112 enclose a receiving space for placing a plurality of electrical de-embedding unit slots 120, the threaded rod 113 is slidably inserted through the first fastening plate 111 and the second fastening plate 112, and nuts 115 and washers are respectively provided at both ends of the threaded rod 113. In this way, when the two nuts 115 are tightened, the first fastening plate 111 cooperates with the second fastening plate 112 to squeeze the plurality of electrical de-embedding unit slots 120, thereby forming a stable structure.

[0063] like Figure 4 As shown, in one embodiment, each of the electric deintercalation unit cells 120 further includes a first water distribution network 125 and a second water distribution network 126, wherein the first water distribution network 125 is located between the cathode plate 123 and the ion exchange membrane 122, and the second water distribution network 126 is located between the anode plate 124 and the ion exchange membrane 122. In this embodiment, the first water distribution network 125 and the second water distribution network 126 respectively play the role of supporting the ion exchange membrane 122, thereby extending the service life of the ion exchange membrane 122.

[0064] like Figure 5 As shown, in the second aspect, an embodiment of the present application provides a lithium extraction device 1000, including a lithium extraction device 100, a brine circulation device 200, a lithium-rich liquid circulation device 300, a first switching device 400 and a second switching device 500 in any of the above embodiments.

[0065] The brine circulation device 200 includes a brine tank 210, a first brine pipeline 220 and a second brine pipeline 230. The brine tank 210 is used to store the lithium solution to be extracted and is connected between the first brine pipeline 220 and the second brine pipeline 230. A first circulation pump 240 is provided at the first brine pipeline 220. The lithium-rich liquid circulation device 300 includes a lithium-rich liquid tank 310, a first lithium-rich liquid pipeline 320 and a second lithium-rich liquid pipeline 330. The lithium-rich liquid tank 310 is used to store the electrolyte solution and is connected between the first lithium-rich liquid pipeline 320 and the second lithium-rich liquid pipeline 330. A second circulation pump 340 is provided at the first lithium-rich liquid pipeline 320. The first switching device 400 is respectively connected to the first brine pipeline 220, the first lithium-rich liquid pipeline 320, the first liquid inlet pipe 1271 of each electrical deintercalation unit tank 120, and the second liquid inlet pipe 1273 of each electrical deintercalation unit tank 120. The second switching device 500 is respectively connected to the second brine pipeline 230, the second lithium-rich liquid pipeline 330, the first liquid outlet pipe 1272 of each electric deintercalation unit tank 120, and the second liquid outlet pipe 1274 of each electric deintercalation unit tank 120. The second switching device 500 cooperates with the first switching device 400 to realize the alternating switching of the lithium extraction device 1000 between the first working state and the second working state.

[0066] In this embodiment, in the first working state, the first liquid inlet pipe 1271 of each electric deintercalation unit cell 120 is connected to the first brine pipeline 220, the first liquid outlet pipe 1272 of each electric deintercalation unit cell 120 is connected to the second brine pipeline 230, the second liquid inlet pipe 1273 of each electric deintercalation unit cell 120 is connected to the first lithium-rich liquid pipeline 320, and the second liquid outlet pipe 1274 of each electric deintercalation unit cell 120 is connected to the second lithium-rich liquid pipeline 330. The first circulation pump 240 extracts the lithium solution to be extracted from the brine tank 210, and disperses the lithium solution to be extracted into the cathode chamber 1211 of multiple electric deintercalation unit cells 120 through the first brine pipeline 220 for electrochemical reaction, and then returns the lithium solution to be extracted from the second brine pipeline 230 to the brine tank 210, and then extracts the lithium solution to be extracted from the brine tank 210 again and disperses it into the cathode chamber 1211 of multiple electric deintercalation unit cells 120, and repeats the cycle. At the same time, the second circulation pump 340 extracts the electrolyte solution in the lithium-rich liquid tank 310, and disperses the electrolyte solution into the anode chamber 1212 of multiple electric deintercalation unit tanks 120 through the first lithium-rich liquid pipeline 320 for electrochemical reaction, and then returns the electrolyte solution to the lithium-rich liquid tank 310 from the second lithium-rich liquid pipeline 330, and then the electrolyte solution is again extracted from the lithium-rich liquid tank 310 and dispersed into the cathode chamber 1211 of multiple electric deintercalation unit tanks 120, and the cycle is repeated. After completing one electric deintercalation cycle, the DC power supply is switched between positive and negative poles, and the lithium extraction equipment 1000 is switched to the second working state through the first switching device 400 and the second switching device 500, so that Li + The lithium in the lithium solution to be extracted is separated from other elements, so that the lithium in the lithium solution to be extracted is continuously enriched in the electrolyte solution to obtain a lithium-rich solution.

[0067] Continue reading Figure 5 In one embodiment, the first switching device 400 includes a first pipeline 410, a second pipeline 420, a third pipeline 430 and a fourth pipeline 440, the first pipeline 410 is connected to the first liquid inlet pipe 1271 of each electric deintercalation unit tank 120, the second pipeline 420 is connected to the second liquid inlet pipe 1273 of each electric deintercalation unit tank 120, the third pipeline 430 and the fourth pipeline 440 are both connected between the first pipeline 410 and the second pipeline 420, and the fourth pipeline 440 is connected to the first brine pipeline 220. The third pipeline 430 is connected with the first lithium-rich liquid pipeline 320, and the first switching valve 450 and the second switching valve 460 are respectively provided at the third pipeline 430. The connecting position of the first lithium-rich liquid pipeline 320 and the third pipeline 430 is located between the first switching valve 450 and the second switching valve 460. The fourth pipeline 440 is provided with a third switching valve 470 and a fourth switching valve 480, and the connecting position of the first brine pipeline 220 and the fourth pipeline 440 is located between the third switching valve 470 and the fourth switching valve 480.

[0068] In this embodiment, the second switching valve 460 and the third switching valve 470 are opened, and the first switching valve 450 and the fourth switching valve 480 are closed, so that the first liquid inlet pipe 1271 of each electric deintercalation unit tank 120 is connected to the first brine pipeline 220, and the second liquid inlet pipe 1273 of each electric deintercalation unit tank 120 is connected to the first lithium-rich liquid pipeline 320. The first switching valve 450 and the fourth switching valve 480 are opened, and the second switching valve 460 and the third switching valve 470 are closed, so that the first liquid inlet pipe 1271 of each electric deintercalation unit tank 120 is connected to the first lithium-rich liquid pipeline 320, and the second liquid inlet pipe 1273 of each electric deintercalation unit tank 120 is connected to the first brine pipeline 220.

[0069] Continue reading Figure 5 Further, a first drain valve 491 is provided at the first pipeline 410, and a second drain valve 492 is provided at the second pipeline 420. In this embodiment, after the lithium extraction process is completed, the first drain valve 491 and the second drain valve 492 can be opened to discharge the tail liquid in the cathode chamber 1211 and the anode chamber 1212 to keep the cathode chamber 1211 and the anode chamber 1212 clean.

[0070] Continue reading Figure 5 In one embodiment, the second switching device 500 includes a fifth pipeline 510, a sixth pipeline 520, a seventh pipeline 530 and an eighth pipeline 540, the fifth pipeline 510 is connected to the first liquid outlet pipe 1272 of each electrical deintercalation unit tank 120, the sixth pipeline 520 is connected to the second liquid outlet pipe 1274 of each electrical deintercalation unit tank 120, the seventh pipeline 530 and the eighth pipeline 540 are both connected between the fifth pipeline 510 and the sixth pipeline 520, and the seventh pipeline 530 is connected to the second brine pipeline 230. The eighth pipeline 540 is connected with the second lithium-rich liquid pipeline 330, and the fifth switching valve 550 and the sixth switching valve 560 are respectively provided at the seventh pipeline 530. The connecting position of the second brine pipeline 230 and the seventh pipeline 530 is located between the fifth switching valve 550 and the sixth switching valve 560. The seventh switching valve 570 and the eighth switching valve 580 are provided at the eighth pipeline 540, and the connecting position of the second lithium-rich liquid pipeline 330 and the eighth pipeline 540 is located between the seventh switching valve 570 and the eighth switching valve 580.

[0071] In this embodiment, the fifth switching valve 550 and the eighth switching valve 580 are opened, and the sixth switching valve 560 and the seventh switching valve 570 are closed, so that the first liquid outlet pipe 1272 of each electrical deintercalation unit tank 120 is connected to the second brine pipeline 230, and the second liquid outlet pipe 1274 of each electrical deintercalation unit tank 120 is connected to the second lithium-rich liquid pipeline 330. The sixth switching valve 560 and the seventh switching valve 570 are opened, and the fifth switching valve 550 and the eighth switching valve 580 are closed, so that the first liquid outlet pipe 1272 of each electrical deintercalation unit tank 120 is connected to the second lithium-rich liquid pipeline 330, and the second liquid outlet pipe 1274 of each electrical deintercalation unit tank 120 is connected to the second brine pipeline 230.

[0072] Continue reading Figure 5 In one embodiment, the first brine pipeline 220 is provided with a first discharge valve 260 and a third drain valve 250, and the third drain valve 250 is located between the brine tank 210 and the first discharge valve 260. In this embodiment, the first discharge valve 260 is used to control the on-off of the first brine pipeline 220. After the lithium extraction process is completed, the third drain valve 250 can be opened to discharge the tail liquid in the brine tank 210.

[0073] Continue reading Figure 5 In one embodiment, the first lithium-rich liquid pipeline 320 is provided with a second discharge valve 360 ​​and a fourth drain valve 350, and the fourth drain valve 350 is located between the lithium-rich liquid tank 310 and the second discharge valve 360. In this embodiment, the second discharge valve 360 ​​is used to control the on-off of the first lithium-rich liquid pipeline 320. After the lithium extraction process is completed, the third drain valve 250 can be opened to discharge the lithium-rich liquid in the lithium-rich liquid tank 310.

[0074] In summary, the process of extracting lithium using the lithium extraction device 1000 provided in this embodiment is shown in steps S610 to S670:

[0075] S610, injecting the lithium solution to be extracted into the brine tank 210, the lithium solution to be extracted includes but is not limited to lithium-containing salt lake water, seawater, salt field brine, wastewater, etc., and injecting an electrolyte solution, such as clean water, into the lithium-rich liquid pipe.

[0076] S620 , opening the first drain valve 491 and the second drain valve 492 to drain the liquid in each electro-deintercalation unit tank 120 .

[0077] S630, open the first discharge valve 260, the third switching valve 470, the fifth switching valve 550, the second discharge valve 360, the second switching valve 460, the eighth switching valve 580, and close other valves, and then start the first circulation pump 240 and the second circulation pump 340.

[0078] S640, start the DC power supply (the voltage can be set to 0.35V, and the initial current density is 20-25A / ㎡), connect the cathode plate 123 of each electrical deintercalation unit slot 120 to the negative electrode of the DC power supply, so that the cathode plate 123 absorbs lithium, and connect the anode plate 124 of each electrical deintercalation unit slot 120 to the positive electrode of the DC power supply, so that the anode plate 124 releases lithium.

[0079] S650, when the current drops significantly (the current density threshold can be set to 1 / 4 to 1 / 5 of the initial current density), turn off the DC power supply, the first circulation pump 240 and the second circulation pump 340, and perform positive and negative phase switching operation on the DC power supply, and at the same time switch the valves as follows: open the first discharge valve 260, the fourth switching valve 480, the sixth switching valve 560, the second discharge valve 360, the first switching valve 450 and the seventh switching valve 570, and close other valves.

[0080] S660, repeat S640.

[0081] S670, open the third drain valve 250 to discharge the tail liquid in the brine tank 210 for standby use, open the fourth drain valve 350 to discharge the lithium-rich liquid in the lithium-rich liquid tank 310 for standby use, and complete the lithium extraction process.

[0082] It can be understood that since the lithium extraction equipment 1000 provided in this embodiment has the lithium extraction device 100 in any of the above embodiments, it has all the beneficial effects of the lithium extraction device 100, which will not be listed one by one here.

[0083] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0084] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A lithium extraction device, characterized in that: include: An outer frame (110) defines a receiving space; as well as A plurality of electrical de-embedding unit slots (120) are arranged in the accommodation space; Each of the electrical deintercalation unit cells (120) comprises a cell body (121), an ion exchange membrane (122), a cathode plate (123) and an anode plate (124); the cell body (121) has a receiving cavity; the ion exchange membrane (122) divides the receiving cavity into a cathode chamber (1211) and an anode chamber (1212); the cathode plate (123) is arranged in the cathode chamber (1211); the anode plate (124) is arranged in the anode chamber (1212); the cell body (121) is provided with a first liquid inlet pipe (1271) and a first liquid outlet pipe (1272) respectively connected to the cathode chamber (1211); and a second liquid inlet pipe (1273) and a second liquid outlet pipe (1274) respectively connected to the anode chamber (1212); In a first working state, the first liquid inlet pipe (1271) and the first liquid outlet pipe (1272) are respectively used to connect to a brine circulation device (200), and the second liquid inlet pipe (1273) and the second liquid outlet pipe (1274) are respectively used to connect to a lithium-rich liquid circulation device (300); in a second working state, the first liquid inlet pipe (1271) and the first liquid outlet pipe (1272) are respectively used to connect to the lithium-rich liquid circulation device (300), and the second liquid inlet pipe (1273) and the second liquid outlet pipe (1274) are respectively used to connect to the brine circulation device (200).

2. The lithium extraction device according to claim 1, characterized in that: The first liquid inlet pipe (1271) and the first liquid outlet pipe (1272) are arranged far apart from each other, the second liquid inlet pipe (1273) and the second liquid outlet pipe (1274) are arranged far apart from each other, and the first liquid inlet pipe (1271) and the first liquid outlet pipe (1272) are arranged on different sides of the tank body (121), and the second liquid inlet pipe (1273) and the second liquid outlet pipe (1274) are arranged on different sides of the tank body (121).

3. The lithium extraction device according to claim 2, characterized in that: The first liquid inlet pipe (1271) is located below the cathode plate (123), the first liquid outlet pipe (1272) is located above the cathode plate (123), the second liquid inlet pipe (1273) is located below the anode plate (124), and the second liquid outlet pipe (1274) is located above the anode plate (124).

4. The lithium extraction device according to claim 1, characterized in that: Each of the electric deintercalation unit slots (120) further comprises a first liquid baffle plate (1281) and a second liquid baffle plate (1282), wherein the first liquid baffle plate (1281) is arranged in the cathode chamber (1211) and is located below the cathode plate (123), and the second liquid baffle plate (1282) is arranged in the anode chamber (1212) and is located below the anode plate (124), and the first liquid baffle plate (1281) and the bottom wall of the cathode chamber (1211) define a first buffer chamber (128 11), and defines a first overflow gap (12812) with the side wall of the cathode chamber (1211), the first liquid inlet pipe (1271) is located at the first buffer chamber (12811), the second liquid baffle plate (1282) and the bottom wall of the anode chamber (1212) define a second buffer chamber (12821), and defines a second overflow gap (12822) with the side wall of the anode chamber (1212), and the second liquid inlet pipe (1273) is located at the second buffer chamber (12821).

5. The lithium extraction device according to any one of claims 1 to 4, characterized in that: Each of the electric deintercalation unit slots (120) further comprises a third liquid baffle plate (1283) and a fourth liquid baffle plate (1284), wherein the third liquid baffle plate (1283) is arranged in the cathode chamber (1211) and is located above the cathode plate (123), and the fourth liquid baffle plate (1284) is arranged in the anode chamber (1212) and is located above the anode plate (124), and the third liquid baffle plate (1283) and the top wall of the cathode chamber (1211) define a third buffer chamber (128 31), and defines a third overflow gap (12832) with the side wall of the cathode chamber (1211), the first liquid outlet pipe (1272) is located at the third buffer chamber (12831), the fourth liquid baffle plate (1284) and the top wall of the anode chamber (1212) define a fourth buffer chamber (12841), and defines a fourth overflow gap (12842) with the side wall of the anode chamber (1212), and the second liquid outlet pipe (1274) is located at the fourth buffer chamber (12841).

6. The lithium extraction device according to any one of claims 1 to 4, characterized in that: The cathode plate (123) has a negative electrode ear (1231), and the anode plate (124) has a positive electrode ear (1241). Each of the electrical deintercalation unit cells (120) further includes a first busbar (1291) and a second busbar (1292), wherein the first busbar (1291) is electrically connected to the negative electrode ear (1231), and the second busbar (1292) is electrically connected to the positive electrode ear (1241).

7. A lithium extraction device, characterized in that: include: The lithium extraction device according to any one of claims 1 to 6; A brine circulation device (200) comprises a brine tank (210), a first brine pipeline (220) and a second brine pipeline (230), wherein the brine tank (210) is used to store a lithium solution to be extracted and is connected between the first brine pipeline (220) and the second brine pipeline (230), and a first circulation pump (240) is provided at the first brine pipeline (220); A lithium-rich liquid circulation device (300) comprises a lithium-rich liquid tank (310), a first lithium-rich liquid pipeline (320) and a second lithium-rich liquid pipeline (330), wherein the lithium-rich liquid tank (310) is used to store an electrolyte solution and is connected between the first lithium-rich liquid pipeline (320) and the second lithium-rich liquid pipeline (330), and a second circulation pump (340) is provided at the first lithium-rich liquid pipeline (320); a first switching device (400) which is respectively connected to the first brine pipeline (220), the first lithium-rich liquid pipeline (320), the first liquid inlet pipe (1271) of each of the electrical deintercalation unit tanks (120), and the second liquid inlet pipe (1273) of each of the electrical deintercalation unit tanks (120); and A second switching device (500) is respectively connected to the second brine pipeline (230), the second lithium-rich liquid pipeline (330), the first liquid outlet pipe (1272) of each of the electrical deintercalation unit tanks (120), and the second liquid outlet pipe (1274) of each of the electrical deintercalation unit tanks (120); The second switching device (500) cooperates with the first switching device (400) to achieve alternating switching of the lithium extraction equipment between the first working state and the second working state.

8. The lithium extraction equipment according to claim 7, characterized in that: The first switching device (400) comprises a first pipeline (410), a second pipeline (420), a third pipeline (430) and a fourth pipeline (440), wherein the first pipeline (410) is connected to the first liquid inlet pipe (1271) of each of the electric deintercalation unit slots (120), the second pipeline (420) is connected to the second liquid inlet pipe (1273) of each of the electric deintercalation unit slots (120), the third pipeline (430) and the fourth pipeline (440) are both connected between the first pipeline (410) and the second pipeline (420), the fourth pipeline (440) is connected to the first brine pipeline (220), and the The third pipeline (430) is connected to the first lithium-rich liquid pipeline (320); a first switching valve (450) and a second switching valve (460) are respectively provided at the third pipeline (430); a connection position between the first lithium-rich liquid pipeline (320) and the third pipeline (430) is located between the first switching valve (450) and the second switching valve (460); a third switching valve (470) and a fourth switching valve (480) are provided at the fourth pipeline (440); a connection position between the first brine pipeline (220) and the fourth pipeline (440) is located between the third switching valve (470) and the fourth switching valve (480).

9. The lithium extraction equipment according to claim 8, characterized in that: A first drain valve (491) is disposed at the first pipeline (410), and a second drain valve (492) is disposed at the second pipeline (420).

10. The lithium extraction equipment according to claim 7, characterized in that: The second switching device (500) comprises a fifth pipeline (510), a sixth pipeline (520), a seventh pipeline (530) and an eighth pipeline (540), wherein the fifth pipeline (510) is connected to the first liquid outlet pipe (1272) of each of the electrical deintercalation unit tanks (120), the sixth pipeline (520) is connected to the second liquid outlet pipe (1274) of each of the electrical deintercalation unit tanks (120), the seventh pipeline (530) and the eighth pipeline (540) are both connected between the fifth pipeline (510) and the sixth pipeline (520), the seventh pipeline (530) is connected to the second brine pipeline (230), and the The eighth pipeline (540) is connected to the second lithium-rich liquid pipeline (330); the seventh pipeline (530) is provided with a fifth switching valve (550) and a sixth switching valve (560); the second brine pipeline (230) and the seventh pipeline (530) are connected between the fifth switching valve (550) and the sixth switching valve (560); the eighth pipeline (540) is provided with a seventh switching valve (570) and an eighth switching valve (580); the second lithium-rich liquid pipeline (330) and the eighth pipeline (540) are connected between the seventh switching valve (570) and the eighth switching valve (580).

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