Lithium recovery device

Abstract

The utility model relates to a lithium recovery device which comprises a plurality of adsorption columns and a control valve group, the plurality of adsorption columns are sequentially connected and form an adsorption group, a water jacking group, a desorption group and a backflushing group which operate circularly, the adsorption group can adsorb lithium in high-concentration lithium-containing feed liquid, the water jacking group ejects and recovers the feed liquid existing in the adsorption columns, and the control valve group is connected with the control valve group. The desorption group can realize desorption of lithium ions, and enables the adsorption column to obtain the effect of adsorbing the lithium ions again; the recoil group can realize the recycling of the recovered liquid; the control valve group can control the adsorption column completing adsorption to operate a backflushing action, control the adsorption column completing backflushing to operate a desorption action, control the adsorption column completing desorption to operate a water jacking action, and complete the adsorption column completing water jacking to operate an adsorption action; by means of the control valve set, each adsorption column can sequentially complete the adsorption action, the water jacking action, the desorption action and the back flushing action according to the sequence and operate in cycles, waste of lithium ions and recycled liquid can be avoided, and environmental pollution can be avoided.

Description

Technical Field

[0001] This application relates to the field of ion recovery technology, and in particular to a lithium recovery device. Background Technology

[0002] Lithium is widely used in batteries, ceramics, glass, lubricants, refrigerants, the nuclear industry, and optoelectronics. In the National Strategic Emerging Industries Directory, the development and utilization of lithium resources spans seven major industries: energy conservation and environmental protection, next-generation information technology, biotechnology, high-end equipment manufacturing, new energy, new materials, and new energy vehicles. It is a key factor determining future international competition in strategic emerging industries.

[0003] In related technologies, during the production of lithium hydroxide or lithium carbonate, the mother liquor and rinsing liquid contain high concentrations of lithium ions during the separation of solid lithium salt from the mother liquor and during the rinsing process of solid lithium salt. If the mother liquor and rinsing liquid are discharged directly without being recycled, it can easily cause environmental pollution and waste lithium ion resources. Utility Model Content

[0004] Therefore, it is necessary to provide a lithium recycling device that can avoid the waste of lithium ions and prevent environmental pollution.

[0005] A lithium recovery device, comprising:

[0006] A plurality of adsorption columns are connected in sequence to form a circulating adsorption group, a top water group, a desorption group and a backwash group.

[0007] Each of the adsorption columns is equipped with a lithium extraction resin for adsorbing lithium from a lithium-containing liquid; the adsorption group is configured to input the lithium-containing liquid to be treated; the top water group is configured to input the liquid after lithium removal; the desorption group is configured to input the desorption liquid; and the backflushing group is configured to input the recovery liquid.

[0008] The control valve group is capable of controlling the adsorption column that has completed adsorption to perform a backflushing action, controlling the adsorption column that has completed backflushing to perform a desorption action, controlling the adsorption column that has completed desorption to perform a top water action, and controlling the adsorption column that has completed top water action to perform an adsorption action.

[0009] Each of the adsorption columns sequentially performs adsorption, top water action, desorption, and backwashing actions, and operates in a continuous cycle.

[0010] In one embodiment, the lithium recovery device further includes an adsorption feed tank and an adsorption discharge tank. The adsorption feed tank is used to store lithium-containing liquid. The adsorption feed tank has a first water outlet pipe, and the adsorption discharge tank has a first water inlet pipe. Each adsorption column is provided with a first feed pipe and a first discharge pipe. The first feed pipe is connected to the first water outlet pipe. The first discharge pipe is connected to the first water inlet pipe.

[0011] The control valve assembly includes a first control valve disposed on the first feed pipe and the first discharge pipe.

[0012] In one embodiment, the first water inlet pipe is connected to the feed inlet of the adsorption group; the first water outlet pipe is connected to the discharge outlet of the adsorption group.

[0013] In one embodiment, the lithium recovery device further includes a desorption tank for storing desorption liquid. The desorption tank has a second inlet pipe and a second outlet pipe. Each adsorption column is provided with a second feed pipe and a second discharge pipe. The second feed pipe is connected to the second outlet pipe, and the second discharge pipe is connected to the second inlet pipe.

[0014] The control valve assembly includes a second control valve disposed on the second feed pipe and the second discharge pipe.

[0015] In one embodiment, the second water inlet pipe is connected to the outlet of the top water assembly; the second water outlet pipe is connected to the inlet of the desorption assembly.

[0016] In one embodiment, the lithium recovery device further includes a recovery tank having a third inlet pipe and a third outlet pipe. Each of the adsorption columns is provided with a third feed pipe and a third discharge pipe, wherein the third feed pipe is connected to the third outlet pipe and the third discharge pipe is connected to the third inlet pipe.

[0017] The control valve assembly includes a third control valve disposed on the third feed pipe and the third discharge pipe.

[0018] In one embodiment, the third water inlet pipe is connected to the outlet of the desorption group; the third water outlet pipe is connected to the inlet of the backflushing group.

[0019] In one embodiment, the adsorption discharge box has a fourth water inlet pipe, and each of the adsorption columns is provided with a recovery pipe, which is connected to the fourth water inlet pipe;

[0020] The control valve assembly includes a fourth control valve disposed on the recovery pipeline.

[0021] In one embodiment, the fourth water inlet pipe is connected to the discharge port of the backflushing unit.

[0022] In one embodiment, a first connecting pipe is provided between two adjacent adsorption columns; a second connecting pipe is provided between the adsorption column and another adsorption column that is spaced apart by one adsorption column; the control valve group includes a fifth control valve provided on the first connecting pipe and the second connecting pipe.

[0023] In the above scheme, several adsorption columns are set up and connected in sequence to form a circulating adsorption group, a top water group, a desorption group, and a backflushing group. The adsorption group can adsorb lithium in high-concentration lithium-containing liquid. The top water group pushes out the liquid in the adsorption column for recovery, reducing liquid loss. The desorption group can desorb lithium ions and enable the adsorption column to re-adsorb lithium ions. The backflushing group can recycle the recovered liquid. Through the control valve group, each adsorption column can complete the adsorption, top water, desorption, and backflushing actions in sequence and run continuously, which can avoid the waste of lithium ions and recovered liquid and avoid environmental pollution. Attached Figure Description

[0024] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structural layout of a lithium recovery device according to an embodiment of this application.

[0027] Figure 2 This is a partial structural layout diagram of a lithium recovery device according to an embodiment of this application.

[0028] Explanation of reference numerals in the attached figures

[0029] 10. Lithium recovery unit; 100. Adsorption column; 110. Adsorption group; 111. First feed pipe; 112. First discharge pipe; 120. Top water group; 130. Desorption group; 131. Second feed pipe; 132. Second discharge pipe; 140. Backflushing group; 141. Third feed pipe; 142. Third discharge pipe; 150. Recovery pipe; 160. First connecting pipe; 170. Second connecting pipe; 200. Control valve group; 210. First control valve; 220, second control valve; 230, third control valve; 240, fourth control valve; 250, fifth control valve; 300, adsorption feed box; 310, first water outlet pipe; 320, fourth water inlet pipe; 400, adsorption discharge box; 410, first water inlet pipe; 500, desorption box; 510, second water inlet pipe; 520, second water outlet pipe; 600, recovery box; 610, third water inlet pipe; 620, third water outlet pipe. Detailed Implementation

[0030] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0031] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0032] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0034] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0035] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0036] Please see Figure 1 and Figure 2 This application relates to a lithium recovery device 10, comprising a plurality of adsorption columns 100 and a control valve assembly 200. The plurality of adsorption columns 100 are connected in sequence to form a circulating adsorption group 110, a top water group 120, a desorption group 130, and a backflushing group 140. Each adsorption column 100 is provided with lithium extraction resin for adsorbing lithium in lithium-containing liquid. The control valve assembly 200 is connected to the adsorption column 100.

[0037] Adsorption unit 110 is configured to accept the lithium-containing solution to be treated. The lithium-containing solution is input into adsorption unit 110, where the adsorption column 100 utilizes its adsorption properties to adsorb lithium from the high-concentration lithium-containing solution, thereby achieving lithium removal. It should be noted that the lithium ion concentration in the lithium-containing solution input into adsorption unit 110 is 200 mg / L to 400 mg / L.

[0038] The top water assembly 120 is configured to receive the lithium-removed feed solution. The top water assembly 120 uses the lithium-removed feed solution to push out and recover the feed solution remaining in the adsorption column 100 within the top water assembly 120, thereby reducing feed solution loss.

[0039] The desorption unit 130 is configured to input the desorption solution. When the desorption solution is input into the desorption unit 130, the adsorption column 100 in the desorption unit 130 uses its desorption properties to desorb the lithium ions on the adsorption column 100, so that the adsorption column 100 can regain the function of adsorbing lithium ions.

[0040] The backflushing unit 140 is configured to input the recovery liquid. The recovery liquid is a qualified lithium-removed liquid. The recovery liquid is input into the backflushing unit 140, and the backflushing unit 140 uses the adsorption column 100 in the backflushing unit 140 to push out and recover the lithium-removed liquid, thereby reducing the loss of liquid.

[0041] The control valve assembly 200 can control the adsorption column 100 that has completed adsorption to perform a backflushing action, and control the adsorption column 100 that has completed backflushing to perform a desorption action to carry out the desorption process, and control the adsorption column 100 that has completed desorption to perform a top water action, and the adsorption column 100 that has completed top water to perform an adsorption action.

[0042] Each adsorption column 100 sequentially completes the adsorption, water-lifting, desorption, and backflushing actions, and operates in a continuous cycle.

[0043] During the same time period, adsorption column 100 in adsorption group 110 adsorbs and removes lithium. Adsorption column 100 in top water group 120 tops the feed with water, recovering the lithium-removed liquid. Adsorption column 100 in desorption group 130 desorbs lithium ions and restores the adsorption performance of adsorption column 100. Adsorption column 100 in backflushing group 140 tops the feed with water, recovering the recovered liquid. Each adsorption column 100 undergoes periodic cycling, meaning that at each switch, one of the four groups' adsorption columns 100 switches to the corresponding next group, achieving continuous operation.

[0044] By setting up several adsorption columns 100, which are connected in sequence to form a circulating adsorption group 110, a top water group 120, a desorption group 130, and a backflushing group 140, the adsorption group 110 can adsorb lithium in high-concentration lithium-containing liquid. The top water group 120 pushes out the liquid in the adsorption column 100 for recovery, reducing liquid loss. The desorption group 130 can desorb lithium ions and enable the adsorption column 100 to re-adsorb lithium ions. The backflushing group 140 can recycle the recovered liquid. Through the control valve group 200, each adsorption column 100 can complete the adsorption, top water, desorption, and backflushing actions in sequence, and operate continuously, which can avoid the waste of lithium ions and recovered liquid and avoid environmental pollution.

[0045] Please see Figure 1 and Figure 2 According to some embodiments of this application, optionally, the lithium recovery device 10 further includes an adsorption feed tank 300 and an adsorption discharge tank 400. The adsorption feed tank 300 is used to store lithium-containing liquid, and has a first water outlet pipe 310. The adsorption discharge tank 400 has a first water inlet pipe 410. Each adsorption column 100 is provided with a first feed pipe 111 and a first discharge pipe 112. The first feed pipe 111 is connected to the first water outlet pipe 310. The first discharge pipe 112 is connected to the first water inlet pipe 410. It should be noted that the concentration of lithium ions in the adsorption discharge tank 400 is <80 mg / L.

[0046] The control valve assembly 200 includes a first control valve 210 disposed on the first feed pipe 111 and the first discharge pipe 112. The first control valve 210 is used to control the connection and disconnection between the first feed pipe 111 and the first water outlet pipe 310 and the first discharge pipe 112 and the first water inlet pipe 410 on each adsorption column 100.

[0047] Specifically, the first water inlet pipe 410 is connected to the feed inlet of the adsorption group 110; the first water outlet pipe 310 is connected to the discharge outlet of the adsorption group 110. By controlling the connection and disconnection between the first feed pipe 111 and the first water outlet pipe 310, and between the first discharge pipe 112 and the first water inlet pipe 410 on each adsorption column 100, the set adsorption columns 100 can be controlled to form the adsorption group 110. It should be noted that: the lithium-containing liquid in the adsorption feed tank 300 is input into the adsorption group 110, and the liquid after lithium removal after adsorption by the adsorption group 110 is input into the adsorption discharge tank 400 for discharge. The feed inlet of the adsorption group 110 is the feed inlet of the first feed pipe 111 on the set adsorption column 100. The discharge outlet of the adsorption group 110 is the discharge outlet of the first discharge pipe 112 on the set adsorption column 100.

[0048] Please see Figure 1 and Figure 2 According to some embodiments of this application, optionally, there are four adsorption columns 100 in the adsorption group 110, which are respectively a first adsorption column 100, a second adsorption column 100, a third adsorption column 100 and a fourth adsorption column 100. The first adsorption column 100 and the third adsorption column 100 are connected in series, the second adsorption column 100 and the fourth adsorption column 100 are connected in series, and the first adsorption column 100 and the second adsorption column 100 are connected in parallel.

[0049] The first feed pipe 111 on the first adsorption column 100 and the first feed pipe 111 on the second adsorption column 100 are respectively connected to a first water outlet pipe 310. The first discharge pipe 112 on the third adsorption column 100 and the first discharge pipe 112 on the fourth adsorption column 100 are respectively connected to a first water inlet pipe 410. That is to say, the feed inlet of the adsorption group 110 is the feed inlet of the first feed pipe 111 on the first adsorption column 100 and the first feed pipe 111 on the second adsorption column 100. The discharge outlet of the adsorption group 110 is the discharge outlet of the first discharge pipe 112 on the third adsorption column 100 and the first discharge pipe 112 on the fourth adsorption column 100.

[0050] Please see Figure 1 and Figure 2 According to some embodiments of this application, optionally, the lithium recovery device 10 further includes a desorption tank 500 for storing the desorption solution. The desorption tank 500 has a second inlet pipe 510 and a second outlet pipe 520. Each adsorption column 100 is provided with a second feed pipe 131 and a second outlet pipe 132. The second feed pipe 131 is connected to the second outlet pipe 520. The second outlet pipe 132 is connected to the second inlet pipe 510. It should be noted that the concentration of lithium ions in the desorption solution of the desorption tank 500 is <20 mg / L.

[0051] The control valve assembly 200 includes a second control valve 220 disposed on the second feed pipe 131 and the second discharge pipe 132. The second control valve 220 is used to control the connection and disconnection between the second feed pipe 131 and the second water outlet pipe 520 and the second discharge pipe 132 and the second water inlet pipe 510 on each adsorption column 100.

[0052] By controlling the opening and closing of the second feed pipe 131 and the second water outlet pipe 520 and the second discharge pipe 132 and the second water inlet pipe 510 on each adsorption column 100, the set adsorption column 100 can be controlled to form a desorption group 130.

[0053] Specifically, the second inlet pipe 510 is connected to the outlet of the top water assembly 120. The outlet of the top water assembly 120 is the outlet of the second outlet pipe 132 on the adsorption column 100 of the top water assembly 120. The second control valve 220 can also control the set adsorption column 100 to form the top water assembly 120. The liquid ejected from the top water assembly 120 can enter the desorption tank 500 through the second inlet pipe 510, which can improve the recovery rate. The second outlet pipe 520 is connected to the inlet of the desorption assembly 130. The desorbed liquid in the desorption tank 500 can enter the desorption assembly 130 through the second outlet pipe 520.

[0054] Please see Figure 1 and Figure 2According to some embodiments of this application, optionally, the desorption group 130 contains four adsorption columns 100, and the four adsorption columns 100 are arranged in series. That is, the inlet of the desorption group 130 is the inlet of the second inlet pipe 131 on the first adsorption column 100. The outlet of the desorption group 130 is the outlet of the second outlet pipe 132 on the last adsorption column 100.

[0055] In this embodiment, the fourth adsorption column 100 in the adsorption group 110 is the top water group 120. The first discharge pipe 112 on the fourth adsorption column 100 is connected to the second water inlet pipe 510, and the discharge port of the top water group 120 is the connection between the first discharge pipe 112 and the second water inlet pipe 510.

[0056] Please see Figure 1 and Figure 2 According to some embodiments of this application, optionally, the lithium recovery device 10 further includes a recovery tank 600, which has a third inlet pipe 610 and a third outlet pipe 620. Each adsorption column 100 is provided with a third feed pipe 141 and a third discharge pipe 142. The third feed pipe 141 is connected to the third outlet pipe 620. The third discharge pipe 142 is connected to the third inlet pipe 610. It should be noted that the concentration of lithium ions in the recovery tank 600 is 600 mg / L to 1300 mg / L.

[0057] The control valve assembly 200 includes a third control valve 230 disposed on the third feed pipe 141 and the third discharge pipe 142. The third control valve 230 is used to control the connection and disconnection between the third feed pipe 141 and the third water outlet pipe 620 and the third discharge pipe 142 and the third water inlet pipe 610 on each adsorption column 100.

[0058] Specifically, the third inlet pipe 610 is connected to the outlet of the desorption group 130. The third outlet pipe 620 is connected to the inlet of the backflushing group 140. By controlling the connection and disconnection between the third inlet pipe 141 and the third outlet pipe 620 and the third outlet pipe 142 and the third inlet pipe 610 on each adsorption column 100, the desorbed liquid can be controlled to be recovered to the recovery tank 600, and the set adsorption columns 100 can be controlled to form the backflushing group 140.

[0059] The desorbed liquid enters the recovery tank 600. This allows for the recovery of lithium ions within the recovery tank 600, preventing waste. It also allows for the recovery of the qualified de-lithiated liquid within the recovery tank 600, preventing waste of the de-lithiated liquid. The qualified de-lithiated liquid in the recovery tank 600 enters the backflushing group 140 through the third outlet pipe 620 and the third inlet pipe 141. The outlet of the desorption group 130 is the outlet of the second outlet pipe 132 on the adsorption column 100 at the tail end.

[0060] Please see Figure 1 and Figure 2 According to some embodiments of this application, optionally, the adsorption discharge box 400 has a fourth water inlet pipe 320, and each adsorption column 100 is provided with a recovery pipe 150, which is connected to the fourth water inlet pipe 320. The control valve assembly 200 includes a fourth control valve 240 disposed on the recovery pipe 150.

[0061] Specifically, the fourth water inlet pipe 320 is connected to the outlet of the backflushing group 140. By controlling the connection and disconnection between the recovery pipe 150 on each adsorption column 100 and the fourth water inlet pipe 320, the qualified lithium-removed liquid in the recovery tank 600 can be controlled to be transported to the adsorption outlet tank 400, so as to realize the recycling of the qualified lithium-removed liquid and improve the recycling rate of the liquid.

[0062] Please see Figure 1 and Figure 2 According to some embodiments of this application, optionally, a first connecting pipe 160 is provided between two adjacent adsorption columns 100. A second connecting pipe 170 is provided between an adsorption column 100 and another adsorption column 100 that is spaced apart by one adsorption column 100. The control valve group 200 includes a fifth control valve 250 provided on the first connecting pipe 160 and the second connecting pipe 170. By controlling the fifth control valve 250 on the first connecting pipe 160 and the second connecting pipe 170, the series and parallel connection relationship between each adsorption column 100 can be controlled to form an adsorption group 110, a top water group 120, a desorption group 130, and a backflushing group 140.

[0063] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0064] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A lithium recovery device, characterized in that, include: A plurality of adsorption columns are connected in sequence to form a circulating adsorption group, a top water group, a desorption group and a backwash group. Each of the adsorption columns is equipped with a lithium extraction resin for adsorbing lithium from a lithium-containing liquid; the adsorption group is configured to input the lithium-containing liquid to be treated; the top water group is configured to input the liquid after lithium removal; the desorption group is configured to input the desorption liquid; and the backflushing group is configured to input the recovery liquid. The control valve group is capable of controlling the adsorption column that has completed adsorption to perform a backflushing action, controlling the adsorption column that has completed backflushing to perform a desorption action, controlling the adsorption column that has completed desorption to perform a top water action, and controlling the adsorption column that has completed top water action to perform an adsorption action. Each of the adsorption columns sequentially performs adsorption, top water action, desorption, and backwashing actions, and operates in a continuous cycle.

2. The lithium recovery device according to claim 1, characterized in that, The lithium recovery device further includes an adsorption feed box and an adsorption discharge box. The adsorption feed box is used to store lithium-containing liquid. The adsorption feed box has a first water outlet pipe, and the adsorption discharge box has a first water inlet pipe. Each adsorption column is provided with a first feed pipe and a first discharge pipe. The first feed pipe is connected to the first water outlet pipe. The first discharge pipe is connected to the first water inlet pipe. The control valve assembly includes a first control valve disposed on the first feed pipe and the first discharge pipe.

3. The lithium recovery device according to claim 2, characterized in that, The first water inlet pipe is connected to the feed inlet of the adsorption group; the first water outlet pipe is connected to the discharge outlet of the adsorption group.

4. The lithium recovery device according to claim 1, characterized in that, The lithium recovery device further includes a desorption tank for storing desorption liquid. The desorption tank has a second inlet pipe and a second outlet pipe. Each adsorption column is provided with a second feed pipe and a second outlet pipe. The second feed pipe is connected to the second outlet pipe. The second outlet pipe is connected to the second inlet pipe. The control valve assembly includes a second control valve disposed on the second feed pipe and the second discharge pipe.

5. The lithium recovery device according to claim 4, characterized in that, The second water inlet pipe is connected to the outlet of the top water assembly; the second water outlet pipe is connected to the inlet of the desorption assembly.

6. The lithium recovery device according to claim 1, characterized in that, The lithium recovery device further includes a recovery tank, which has a third water inlet pipe and a third water outlet pipe. Each of the adsorption columns is provided with a third feed pipe and a third discharge pipe. The third feed pipe is connected to the third water outlet pipe, and the third discharge pipe is connected to the third water inlet pipe. The control valve assembly includes a third control valve disposed on the third feed pipe and the third discharge pipe.

7. The lithium recovery device according to claim 6, characterized in that, The third water inlet pipe is connected to the outlet of the desorption unit; the third water outlet pipe is connected to the inlet of the backflushing unit.

8. The lithium recovery device according to claim 2, characterized in that, The adsorption discharge box has a fourth water inlet pipe, and each adsorption column is provided with a recovery pipe, which is connected to the fourth water inlet pipe. The control valve assembly includes a fourth control valve disposed on the recovery pipeline.

9. The lithium recovery device according to claim 8, characterized in that, The fourth water inlet pipe is connected to the discharge port of the backflushing unit.

10. The lithium recovery device according to claim 1, characterized in that, A first connecting pipe is provided between two adjacent adsorption columns; a second connecting pipe is provided between the adsorption column and another adsorption column that is spaced apart by one adsorption column; the control valve group includes a fifth control valve provided on the first connecting pipe and the second connecting pipe.

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