Electrochemical lithium extraction apparatus and method

Abstract

An electrochemical lithium extraction apparatus, and a method, relating to the technical field of electrochemical metallurgy. The apparatus comprises: a first circulation tank (1), comprising a first inlet (11) and a first outlet (12) in communication with each other; a first circulation pump (2); a second circulation tank (3), comprising a second inlet (31) and a second outlet (32) in communication with each other; a second circulation pump (4); an electrochemical stack (5), having provided therein an anode chamber (52) and a cathode chamber (53) separated by a diaphragm (51), the anode chamber (52) being provided with an anode plate (54), and the cathode chamber (53) being provided with a cathode plate (55). The first outlet (12) is in communication with an inlet of the anode chamber (52) by means of the circulation pump (2), and an outlet of the anode chamber (52) is in communication with the first inlet (11); the second outlet (32) is in communication with an inlet of the cathode chamber (53) by means of the second circulation pump (4), and an outlet of the cathode chamber (53) is in communication with the second inlet (31). The present apparatus and method can extract lithium from lithium-containing solid-phase materials or liquid-phase materials, and the lithium extraction efficiency is high, achieving environmental protection effects.

Description

A lithium electrochemical extraction device and method Technical Field

[0001] The present application relates to the technical field of electrochemical metallurgy, and in particular to a device and method for electrochemical extraction of lithium. Background Art

[0002] Lithium metal and its compounds are widely used in industries such as glass, metallurgy, ceramics, lubricants, and refrigerants. With the rapid rise of emerging industries such as electric vehicles, wind power, and nuclear power, the demand for lithium resources has also seen a dramatic increase. As lithium extraction shifts from ore extraction to lithium-containing brines, seawater extraction, and the extraction of cathode materials from spent lithium-ion batteries, the primary method involves using heat treatment equipment in conjunction with tank reactors and solid-liquid separation equipment. Current electrochemical lithium extraction methods are limited to single-phase lithium-containing materials, limiting their applicability and resulting in low extraction efficiency, high energy consumption, and environmental concerns.

[0003] Summary of the Invention

[0004] The purpose of this application is to provide an electrochemical extraction device and method for lithium, which can extract lithium from lithium-containing solid-phase materials or liquid-phase materials, and has high efficiency in extracting lithium and environmental protection effects.

[0005] In order to achieve the above objectives, the present application provides, on the one hand, a lithium electrochemical extraction device, comprising:

[0006] A first circulation tank includes a first inlet and a first outlet that are connected to each other;

[0007] First circulation pump;

[0008] A second circulation tank includes a second inlet and a second outlet that are connected to each other;

[0009] a second circulation pump; and

[0010] A fuel cell stack having an anode chamber and a cathode chamber separated by a diaphragm, wherein the anode chamber is provided with an anode plate, and the cathode chamber is provided with a cathode plate; the first outlet is connected to the inlet of the anode chamber via the circulation pump, and the outlet of the anode chamber is connected to the first inlet; the second outlet is connected to the inlet of the cathode chamber via the second circulation pump, and the outlet of the cathode chamber is connected to the second inlet;

[0011] Wherein, there is at least one anode chamber and cathode chamber; the anode plate is used to transfer the lithium contained in the anode slurry in the anode chamber from the solid phase to the liquid phase, and the cathode plate is used to transfer the lithium contained in the cathode slurry in the cathode chamber from the liquid phase to the solid phase.

[0012] In some embodiments, an anode plate is provided in the middle of each anode chamber, and a cathode plate is provided in the middle of each cathode chamber.

[0013] In some embodiments, the anode plate and the cathode plate are plate-shaped, and the distance L between the anode plate and the diaphragm and the distance L between the cathode plate and the diaphragm satisfy 0 mm < L ≤ 80 mm.

[0014] In some embodiments, two anode plates are correspondingly provided on both sides of each anode chamber, and two cathode plates are correspondingly provided on both sides of each cathode chamber.

[0015] In some embodiments, the anode plate and the cathode plate are porous in shape; the distance between the anode plate and the diaphragm and the distance L between the cathode plate and the diaphragm satisfy 0 mm ≤ L ≤ 80 mm.

[0016] In some embodiments, the anode chambers and cathode chambers are staggered and arranged vertically.

[0017] In some embodiments, the fuel cell stack further includes a liquid distribution pipe, which is provided at the inlet and outlet of the anode chamber and extends along the length direction of the anode chamber, and the liquid distribution pipe is provided at the inlet and outlet of the cathode chamber and extends along the length direction of the cathode chamber.

[0018] In some embodiments, a plurality of through holes are distributed on the surface of the liquid distribution tube.

[0019] In some embodiments, the first circulation tank further includes a first feed port and a first discharge port, the first feed port is connected to the first outlet, the first discharge port is connected to the first inlet, or / and the second circulation tank further includes a second feed port and a second discharge port, the second feed port is connected to the second outlet, and the second discharge port is connected to the second inlet.

[0020] In some embodiments, the material of the anode plate is one of graphite, lead, lead alloy, titanium and coated titanium, and the coated titanium is one of lead dioxide coated on titanium, titanium-manganese alloy coated on titanium, manganese dioxide coated on titanium, iridium or ruthenium oxide coated on titanium, and tin antimony oxide coated on titanium.

[0021] In some embodiments, the cathode plate is made of one of iron, nickel, copper, zinc, aluminum, lead, manganese, stainless steel, iron-nickel alloy, aluminum alloy, zinc alloy, lead alloy, and manganese alloy.

[0022] On the other hand, the present application provides a method for electrochemical extraction of lithium, using the above-mentioned electrochemical extraction device of lithium, comprising the following steps:

[0023] obtaining a solid-phase lithium-containing material, and mixing the solid-phase lithium-containing material with an electrolyte solution to form an anode slurry;

[0024] The first circulation pump is turned on to transport the anode slurry from the first circulation tank into the anode chamber of the fuel cell stack. The fuel cell stack is connected to a power supply to electrolyze the anode slurry so that the lithium in the anode slurry is transferred from the solid phase to the liquid phase. The anode slurry that has completed the electrolysis is discharged from the anode chamber into the first circulation tank.

[0025] After repeating the above step at least once, the anode slurry that has completed electrolysis is discharged from the first circulation tank and undergoes solid-liquid separation to obtain a lithium-rich solution.

[0026] In some embodiments, the solid-phase lithium-containing material is a recycled cathode material of a lithium-ion battery.

[0027] In some embodiments, the solid phase lithium-containing material is obtained by the following method:

[0028] Obtaining lithium-containing brine, and mixing the lithium-containing brine with a lithium-deintercalation material to form a cathode slurry;

[0029] Turning on the second circulation pump to transport the cathode slurry from the second circulation tank into the cathode chamber of the stack, connecting the stack to a power source to electrolyze the cathode slurry, transferring lithium in the cathode slurry from the liquid phase to the solid phase, and discharging the cathode slurry from the cathode chamber into the second circulation tank after the electrolysis is completed;

[0030] After repeating the above step at least once, the cathode slurry that has completed electrolysis is discharged from the second circulation tank and then undergoes solid-liquid separation to obtain the solid-phase lithium-containing material.

[0031] In some embodiments, the lithium intercalation and deintercalation material is one of lithium iron phosphate, lithium manganese oxide, and lithium nickel cobalt manganese oxide.

[0032] This application provides a device and method for electrochemical extraction of lithium. Compared with the prior art, its beneficial effects are:

[0033] The first outlet of the first circulation tank is connected to the inlet of the anode chamber through the first circulation pump, and the outlet of the anode chamber is connected to the first inlet of the first circulation tank; the second outlet of the second circulation tank is connected to the inlet of the cathode chamber through the second circulation pump, and the outlet of the cathode chamber is connected to the second inlet of the second circulation tank. After the battery stack is energized, lithium can be extracted from the lithium-containing solid-phase material in the anode chamber, and lithium can be extracted from the lithium-containing liquid-phase material in the cathode chamber. The first circulation tank is in circular communication with the anode chamber, and the second circulation tank is in circular communication with the cathode chamber, thereby realizing cyclic and continuous extraction of lithium, making the extraction efficiency of lithium high, realizing resource recovery, and having environmental protection effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] FIG1 is a schematic diagram of the principle structure of the electrochemical extraction device for lithium provided in an embodiment of the present application.

[0035] FIG2 is a schematic diagram of the first structure of the battery stack of the electrochemical lithium extraction device provided in an embodiment of the present application.

[0036] FIG3 is a schematic diagram of the second structure of the battery stack of the electrochemical lithium extraction device provided in an embodiment of the present application.

[0037] FIG4 is a schematic diagram of the cross-sectional structure along direction A in FIG2 .

[0038] In the figure: 1. First circulation tank; 11. First inlet; 12. First outlet; 13. First feed port; 14. First discharge port; 2. First circulation pump; 3. Second circulation tank; 31. Second inlet; 32. Second outlet; 33. Second feed port; 34. Second discharge port; 4. Second circulation pump; 5. Fuel cell stack; 51. Diaphragm; 52. Anode chamber; 53. Cathode chamber; 54. Anode plate; 55. Cathode plate; 56. Liquid distribution pipe; 561. Through hole; X, length direction of anode chamber; Y, height direction of anode chamber. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0040] It should be understood that in the description of this application, the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. The terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated, that is, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In addition, unless otherwise specified, "multiple" means two or more.

[0041] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0042] As shown in Figures 1-4, the present application provides a lithium electrochemical extraction device, which, in some embodiments, includes a first circulation tank 1, a first circulation pump 2, a second circulation tank 3, a second circulation pump 4, and a stack 5. During operation, the first circulation pump 2 circulates anode slurry between the first circulation tank 1 and the anode chamber 52 of the stack 5; the second circulation pump 4 circulates cathode slurry between the second circulation tank 3 and the cathode chamber 53 of the stack 5.

[0043] Specifically, the first circulation tank 1 includes a first inlet 11 and a first outlet 12 that are connected to each other; the second circulation tank 3 includes a second inlet 31 and a second outlet 32 ​​that are connected to each other; the inside of the fuel cell stack 5 is provided with an anode chamber 52 and a cathode chamber 53 that are separated by a diaphragm 51, the anode chamber 52 is provided with an anode plate 54, and the cathode chamber 53 is provided with a cathode plate 55; the first outlet 12 is connected to the inlet of the anode chamber 52 through the circulation pump 2, and the outlet of the anode chamber 52 is connected to the first inlet 11; the second outlet 32 ​​is connected to the inlet of the cathode chamber 53 through the second circulation pump 4, and the outlet of the cathode chamber 53 is connected to the second inlet 31.

[0044] Among them, there is more than one anode chamber 52 and cathode chamber 53; the anode plate 54 is used to transfer the lithium contained in the anode slurry in the anode chamber 52 from the solid phase to the liquid phase, and the cathode plate 55 is used to transfer the lithium contained in the cathode slurry in the cathode chamber 53 from the liquid phase to the solid phase.

[0045] Based on the above-mentioned arrangement, the first outlet 12 of the first circulation tank 1 is connected to the inlet of the anode chamber 52 through the first circulation pump 2, and the outlet of the anode chamber 52 is connected to the first inlet 11 of the first circulation tank 1; the second outlet 32 ​​of the second circulation tank 3 is connected to the inlet of the cathode chamber 53 through the second circulation pump 4, and the outlet of the cathode chamber 53 is connected to the second inlet 31 of the second circulation tank 3. After the fuel cell stack 5 is energized, lithium can be extracted from the lithium-containing solid-phase material in the anode chamber 52, and lithium can be extracted from the lithium-containing liquid-phase material in the cathode chamber 53. In addition, the first circulation tank 1 is circularly connected to the anode chamber 52, and the second circulation tank 3 is circularly connected to the cathode chamber 53, thereby realizing cyclic and continuous extraction of lithium, making the extraction of lithium efficient, realizing resource recovery, and having an environmentally friendly effect.

[0046] As shown in Figure 2, in one embodiment, an anode plate 54 is located in the middle of each anode chamber 52, and a cathode plate 55 is located in the middle of each cathode chamber 53. During operation, the anode slurry in the anode chamber 52 flows along the sides of the anode plate 54, and the cathode slurry in the cathode chamber 53 flows along the sides of the cathode plate 55. This structural arrangement results in relatively narrow flow paths, which can easily cause blockage. However, the advantage is that the distance between the anode plate 54 and the cathode plate 55 is relatively large, resulting in a higher operating voltage and a wider voltage adjustment range.

[0047] In the above embodiment, the anode plate 54 and cathode plate 55 are in a plate-like or porous shape. The anode plate 54 and cathode plate 55 have the function of collecting current. The plate-like structure is easy to install and has low production cost. The porous structure is more expensive, but has a larger contact area with the anode slurry and cathode slurry, which improves the lithium extraction efficiency.

[0048] As shown in Figure 3, in one embodiment, two anode plates 54 are provided on either side of each anode chamber 52, and two cathode plates 55 are provided on either side of each cathode chamber 53. During operation, the anode slurry in the anode chamber 52 flows along the gap between the two anode plates 54, and the cathode slurry in the cathode chamber 53 flows along the gap between the two cathode plates 55. The advantage of this structural arrangement is that the flow path is relatively wide and less likely to cause blockage; however, the distance between the anode plates 54 and the cathode plates 55 is relatively small, resulting in a low operating voltage and a narrow voltage adjustment range.

[0049] In the above embodiment, the shape of the anode plate 54 and the cathode plate 55 is porous, for example, a mesh shape. At this time, since the distance between the anode plate 54 and the cathode plate 55 and the diaphragm 51 is small, only a mesh structure (with holes inside) can be used to allow ions to pass through, thereby realizing the function of collecting current; if a plate structure (without holes inside) is used, it will hinder the ions from passing through the diaphragm 51, affecting the function of collecting current.

[0050] In some embodiments, when the anode plate 54 and the cathode plate 55 are plate-shaped, the distance L between the anode plate 54 and the diaphragm 51 and the distance L between the cathode plate 55 and the diaphragm 51 satisfy 0 mm < L ≤ 80 mm. Within this distance range, the plate-shaped anode plate 54 and the cathode plate 55 do not cling tightly to the diaphragm 51, allowing ions to pass smoothly through the diaphragm 51. When the anode plate 54 and the cathode plate 55 are mesh-shaped, the distance L between the anode plate 54 and the diaphragm 51 and the distance L between the cathode plate 55 and the diaphragm 51 satisfy 0 mm ≤ L ≤ 80 mm. The mesh-shaped anode plate 54 and the cathode plate 55 have holes inside, so ions can pass through the diaphragm 51 even when they cling tightly to the diaphragm 51.

[0051] As shown in Figures 2 and 4, in one embodiment, the anode chamber 52 and the cathode chamber 53 are arranged in an staggered manner and are both arranged vertically, so that the anode slurry flows up and down in the anode chamber 52 along the height direction Y of the anode chamber, and the cathode slurry flows up and down in the cathode chamber 53 along the height direction of the cathode chamber 53. It should be noted that the internal structures of the anode chamber 52 and the cathode chamber 53 are the same; the fuel cell stack also includes a liquid distribution pipe 56, which is arranged at the inlet and outlet of the anode chamber 52, so that the anode slurry flows into or out of the anode chamber 52 through the liquid distribution pipe 56, and the liquid distribution pipe 56 extends along the length X direction of the anode chamber 52, and the liquid distribution pipe 56 is arranged at the inlet and outlet of the cathode chamber 53, so that the cathode slurry flows into or out of the cathode chamber 53 through the liquid distribution pipe 56, and the liquid distribution pipe 56 extends along the length direction of the cathode chamber 53. Specifically, a plurality of through holes 561 are evenly distributed on the surface of the liquid distribution pipe 56, so that the anode slurry flows evenly in the anode chamber 52 and fully contacts the anode plate 54, and the cathode slurry flows evenly in the cathode chamber 53 and fully contacts the cathode plate 55, ensuring the normal progress of the electrochemical reaction, thereby reducing energy consumption.

[0052] In one embodiment, the first circulation tank 1 further includes a first feed port 13 and a first discharge port 14. The first feed port 13 is in communication with the first outlet 12, and the first discharge port 14 is in communication with the first inlet 11. The first inlet 11 is provided with a first three-way valve, so that the first inlet 11 is in communication with the first discharge port 14 and the first outlet 12 respectively through the first three-way valve. During operation, by controlling the first three-way valve, the anode slurry circulates in the first circulation tank 1 and the anode chamber 52 of the stack 5 to achieve a cyclic electrochemical reaction, or the anode slurry is discharged from the first discharge port 14 after the electrochemical reaction is completed. The first feed port 13 is used to input anode slurry that needs to undergo an electrochemical reaction.

[0053] In one embodiment, the second circulation tank 3 further includes a second feed port 33 and a second discharge port 34. The second feed port 33 is in communication with the second outlet 32, and the second discharge port 34 is in communication with the second inlet 31. A second three-way valve is provided at the second inlet 31, so that the second inlet 31 is in communication with the second discharge port 34 and the second outlet 32, respectively, through the second three-way valve. During operation, the second three-way valve is controlled to allow the cathode slurry to circulate within the second circulation tank 3 and the cathode chamber 53 of the stack 5 to achieve a cyclic electrochemical reaction, or the cathode slurry is discharged from the second discharge port 34 after the electrochemical reaction is completed. The second feed port 33 is used to input cathode slurry that needs to undergo an electrochemical reaction.

[0054] Specifically, the material of the anode plate 54 is one of graphite, lead, lead alloy, titanium and coated titanium. The coated titanium is one of lead dioxide coated on titanium, titanium-manganese alloy coated on titanium, manganese dioxide coated on titanium, iridium or ruthenium oxide coated on titanium, and tin-antimony oxide coated on titanium. When the conductivity is met, the anode plate 54 can resist anodic oxidation in a neutral or acidic solution containing chlorine and will not be dissolved or corroded. The material of the cathode plate 55 is one of iron, nickel, copper, zinc, aluminum, lead, manganese, stainless steel, iron-nickel alloy, aluminum alloy, zinc alloy, lead alloy, and manganese alloy. When the conductivity is met, the cathode plate 55 can be stably used in a chlorine-containing solution.

[0055] In addition, the present application provides a method for electrochemical extraction of lithium, wherein the following method is performed by a lithium electrochemical extraction device and comprises the following steps:

[0056] Step 1: obtain a solid-phase lithium-containing material, and mix the solid-phase lithium-containing material with an electrolyte solution to form an anode slurry; wherein the electrolyte solution is used to slurry the solid-phase lithium-containing material, and the electrolyte solution can be a sulfate or chloride solution.

[0057] Step 2: Turn on the first circulation pump 2 to transport the anode slurry from the first circulation tank 1 into the anode chamber 52 of the fuel cell stack 5. Connect the fuel cell stack 5 to a power source to electrolyze the anode slurry, so that the lithium in the anode slurry is transferred from the solid phase to the liquid phase. The anode slurry that has completed the electrolysis is discharged from the anode chamber 52 into the first circulation tank 1.

[0058] Step 3: After repeating the previous step at least once, the anode slurry that has completed electrolysis is discharged from the first circulation tank 1 and undergoes solid-liquid separation to obtain a lithium-rich solution.

[0059] In one embodiment, the solid-phase lithium-containing material is a recovered positive electrode material of a lithium-ion battery. In this case, the above method can realize the recycling of lithium in the positive electrode material of the lithium-ion battery.

[0060] In another embodiment, the solid phase lithium-containing material is obtained by the following steps:

[0061] Step 11: obtaining lithium-containing brine (which may be salt lake brine), and mixing the lithium-containing brine with a lithium-deintercalation material to form a cathode slurry;

[0062] Step 12: Turn on the second circulation pump 4 to transport the cathode slurry from the second circulation tank 3 into the cathode chamber 53 of the stack 5. Connect the stack 5 to a power source to electrolyze the cathode slurry, transferring lithium in the cathode slurry from the liquid phase to the solid phase. The cathode slurry that has completed electrolysis is discharged from the cathode chamber 53 into the second circulation tank 3.

[0063] Step 13: After repeating the previous step at least once, the cathode slurry that has completed electrolysis is discharged from the second circulation tank 3 and then undergoes solid-liquid separation to obtain a solid-phase lithium-containing material.

[0064] Steps 11-13 can prepare the salt lake brine into a solid lithium-containing material, and the solid lithium-containing material can be used to recover and extract lithium through steps 1-3, thereby achieving the purpose of extracting lithium from the salt lake brine.

[0065] The lithium-deintercalation material is one of lithium iron phosphate, lithium manganese oxide, and lithium nickel cobalt manganese oxide. These materials can intercalate lithium ions when they gain electrons (being reduced) and release lithium ions when they lose electrons (being oxidized).

[0066] The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and replacements can be made without departing from the technical principles of the present application. These improvements and replacements should also be regarded as the scope of protection of the present application.

Claims

1. An electrochemical extraction device for lithium, characterized in that, Comprising: A first circulation tank (1), including a first inlet (11) and a first outlet (12) that are connected and communicate with each other; A first circulation pump (2); A second circulation tank (3), including a second inlet (31) and a second outlet (32) that are connected and communicate with each other; A second circulation pump (4); and A stack (5), inside which an anode chamber (52) and a cathode chamber (53) are separated by a diaphragm (51). The anode chamber (52) is provided with an anode plate (54), and the cathode chamber (53) is provided with a cathode plate (55). The first outlet (12) communicates with the inlet of the anode chamber (52) through the circulation pump (2), and the outlet of the anode chamber (52) communicates with the first inlet (11). The second outlet (32) communicates with the inlet of the cathode chamber (53) through the second circulation pump (4), and the outlet of the cathode chamber (53) communicates with the second inlet (31); Wherein, there is one or more of the anode chamber (52) and the cathode chamber (53). The anode plate (54) is used to transfer lithium contained in the anode slurry in the anode chamber (52) from the solid phase to the liquid phase, and the cathode plate (55) is used to transfer lithium contained in the cathode slurry in the cathode chamber (53) from the liquid phase to the solid phase.

2. The electrochemical lithium extraction device according to claim 1, characterized in that, One anode plate (54) is provided in the middle of each anode chamber (52), and one cathode plate (55) is provided in the middle of each cathode chamber (53).

3. The electrochemical extraction device for lithium according to claim 2, characterized in that, The anode plate (54) and the cathode plate (55) are in the shape of plates. The distance between the anode plate (54) and the diaphragm (51) and the distance L between the cathode plate (55) and the diaphragm (51) satisfy 0mm < L ≤ 80mm.

4. The electrochemical extraction device for lithium according to claim 1, characterized in that, Two anode plates (54) are correspondingly provided on both sides of each anode chamber (52), and two cathode plates (55) are correspondingly provided on both sides of each cathode chamber (53).

5. The electrochemical lithium extraction device according to claim 2 or 4, characterized in that, The anode plate (54) and the cathode plate (55) are in the shape of porous. The distance between the anode plate (54) and the diaphragm (51) and the distance L between the cathode plate (55) and the diaphragm (51) satisfy 0mm ≤ L ≤ 80mm.

6. The electrochemical extraction device for lithium according to claim 1, characterized in that, The anode chamber (52) and the cathode chamber (53) are arranged in an alternating manner and are both vertically arranged.

7. The electrochemical extraction device for lithium according to claim 1, characterized in that, The stack (5) further includes a liquid distribution pipe (56). The liquid distribution pipe (56) is provided at the inlet and outlet of the anode chamber (52) and extends along the length direction (X) of the anode chamber (52), and the liquid distribution pipe (56) is provided at the inlet and outlet of the cathode chamber (53) and extends along the length direction of the cathode chamber (53).

8. The electrochemical extraction device for lithium according to claim 7, wherein, A plurality of through holes (561) are evenly distributed on the surface of the liquid distribution pipe (56).

9. The electrochemical lithium extraction device according to claim 1, characterized in that, The first circulation tank (1) further includes a first feed port (13) and a first discharge port (14). The first feed port (13) is communicated with the first outlet (12), and the first discharge port (14) is communicated with the first inlet (11); or / and, the second circulation tank (3) further includes a second feed port (33) and a second discharge port (34). The second feed port (33) is communicated with the second outlet (32), and the second discharge port (34) is communicated with the second inlet (31).

10. The electrochemical extraction device for lithium according to claim 1, characterized in that, The material of the anode plate (54) is one of graphite, lead, lead alloy, titanium, and coated titanium. The coated titanium is one of titanium coated with lead dioxide, titanium coated with titanium manganese alloy, titanium coated with manganese dioxide, titanium coated with iridium or ruthenium oxide, and titanium coated with tin antimony oxide.

11. The electrochemical extraction device for lithium according to claim 1, characterized in that, The material of the cathode plate (55) is one of iron, nickel, copper, zinc, aluminum, lead, manganese, stainless steel, iron-nickel alloy, aluminum alloy, zinc alloy, lead alloy, and manganese alloy.

12. An electrochemical extraction method of lithium, characterized in that, Using the electrochemical extraction device for lithium according to any one of claims 1-11, comprising: Obtaining a solid-phase lithium-containing material, and mixing the solid-phase lithium-containing material with an electrolyte solution to form an anode slurry; Starting the first circulation pump (2) to enable the anode slurry to be transported from the first circulation tank (1) into the anode chamber (52) of the stack (5). The stack (5) is connected to a power source to electrolyze the anode slurry, so that lithium in the anode slurry is transferred from the solid phase to the liquid phase. The electrolyzed anode slurry is discharged from the anode chamber (52) into the first circulation tank (1); After repeating the previous step at least once, the electrolyzed anode slurry is discharged from the first circulation tank (1), and a lithium-rich solution is obtained through solid-liquid separation.

13. The electrochemical lithium extraction method according to claim 12, wherein, The solid-phase lithium-containing material is the positive electrode material of a recycled lithium-ion battery.

14. The electrochemical extraction method of lithium according to claim 12, characterized in that, The solid-phase lithium-containing material is obtained by the following method: Obtaining lithium-containing brine, and mixing the lithium-containing brine with a lithium deintercalation material to form a cathode slurry; Starting the second circulation pump (4) to enable the cathode slurry to be transported from the second circulation tank (3) into the cathode chamber (53) of the stack (5). The stack (5) is connected to a power source to electrolyze the cathode slurry, so that lithium in the cathode slurry is transferred from the liquid phase to the solid phase. The electrolyzed cathode slurry is discharged from the cathode chamber (53) into the second circulation tank (3); After repeating the previous step at least once, the electrolyzed cathode slurry is discharged from the second circulation tank (3), and then the solid-phase lithium-containing material is obtained through solid-liquid separation.

15. The electrochemical extraction method of lithium according to claim 13, characterized in that, The lithium deintercalation material is one of lithium iron phosphate, lithium manganate, and lithium nickel cobalt manganate.

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