A lithium extraction and deintercalation method and its application

Abstract

This disclosure provides a lithium extraction and extraction cell and its application. By setting up perforated baffles in the main cell, and arranging the perforations of adjacent baffles in an alternating manner to form multiple interconnected, "assembly line" lithium extraction cells, the lithium solution to be extracted is "baffled" and flows into multiple lithium extraction cells, so that the lithium ion concentration in the lithium solution to be extracted gradually decreases along the flow direction. Lithium extraction electrodes containing different lithium ion sieve materials are set according to the change in concentration, and the lithium extraction electrodes are set as different constant current sections with sequentially decreasing working current and / or different constant voltage sections with sequentially decreasing working voltage to perform electrolytic lithium extraction, thereby achieving a simple, flexible and efficient lithium extraction method.

Description

Technical Field

[0001] This disclosure pertains to the field of electrochemistry, such as a lithium extraction and deintercalation method and its applications. Background Technology

[0002] With the rapid development of new energy vehicles, the demand for lithium in power batteries has grown rapidly in recent years. Lithium, as an important new energy material and strategic reserve resource, is hailed as the "energy metal of the 21st century," and its development and utilization have attracted global attention. According to relevant statistics, the total global lithium resources amount to 40 million tons, of which reserves in brines (including salt lake brines, underground brines, and concentrated seawater) account for approximately 70% of the total reserves. Due to the limited mining of high-quality solid mineral resources, and the cost and scale advantages of brine lithium extraction, the development and utilization of brine lithium resources has become an inevitable trend.

[0003] Electrochemical lithium extraction technology, as a novel lithium separation and extraction technology, has advantages such as being green and efficient. However, current research on electrochemical lithium extraction devices and methods is relatively limited. Due to the low lithium-ion concentration, high mineralization, and high viscosity of brine, the lithium extraction rate in the electrochemical deintercalation method for lithium extraction from salt lakes is low. Furthermore, devices used for electrochemical deintercalation in salt lake lithium extraction suffer from problems such as large electrode spacing, insufficient brine flow, and poor solution mass transfer, which also severely affect the lithium extraction rate. In related technologies, for large-scale industrial production, each lithium extraction deintercalation cell can contain 100 or more anion and cation deintercalation units. Depending on the lithium solution being processed, the maximum peak current of a single anion and cation deintercalation unit can reach 20–60 A, requiring a power supply output current of 2000–6000 A for the entire lithium extraction deintercalation cell. With further research and development, this current may even increase. For a 2-meter-long lithium extraction / deintercalation cell, since the applied working voltage between each pair of anode and cathode deintercalation units cannot exceed 1V or lower, related technologies typically employ a constant current-constant voltage power supply mode to ensure that the working voltage during the lithium extraction process remains within a safe range. However, this power supply method makes it difficult to fully utilize the efficiency of each electrode plate, thus failing to achieve the goal of efficient lithium extraction.

[0004] CN115276141A discloses a power supply method and system for an electrochemical deintercalation / deintercalation power supply. Based on a preset constant current segment sequence, it provides a constant current to each working unit in the electrochemical deintercalation / deintercalation working group and collects the operating voltage of each working unit in real time. When the operating voltage of any working unit reaches a preset voltage threshold, it switches to the next constant current segment, or switches to the next constant current segment after a preset delay. Because the constant current segment sequence includes multiple constant current segments, each with a different current, it ensures the safety of the working units while allowing them to fully utilize their performance. However, the process is cumbersome, and it is difficult to control the boundaries of different constant current segment transitions, making large-scale industrial production difficult.

[0005] Therefore, it is still necessary to develop new technologies for lithium extraction from brine by electrochemical means to address the shortcomings and problems of existing technologies based on electrochemical deintercalation and extraction. Summary of the Invention

[0006] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of the claims.

[0007] In view of the problems existing in the related technologies, the purpose of this disclosure is to provide a lithium extraction and extraction tank and its application. By setting up perforated baffles in the main tank, and arranging the perforations of adjacent baffles in an alternating manner to form multiple connected, "assembly line" lithium extraction tanks, the lithium solution to be extracted is "baffled" to flow into multiple lithium extraction tanks, so that the lithium ion concentration in the lithium solution to be extracted gradually decreases along the flow direction. Lithium extraction electrodes containing different lithium ion sieve materials are set according to the change in concentration, and the lithium extraction electrodes are set as different constant current sections with sequentially decreasing working current and / or different constant voltage sections with sequentially decreasing working voltage to perform electrolytic lithium extraction, thereby achieving a simple, flexible and efficient lithium extraction method.

[0008] To achieve this objective, the present disclosure adopts the following technical solution:

[0009] In a first aspect, this disclosure provides a lithium extraction and deintercalation tank, including a cathode main tank, an anode main tank, and a diaphragm disposed between the cathode main tank and the anode main tank;

[0010] A partition is provided inside the cathode main tank, which divides the cathode main tank into at least two lithium extraction tanks.

[0011] The lithium extraction cell is provided with lithium extraction electrodes, and the anode main cell is provided with deintercalation electrodes corresponding to the number of lithium extraction electrodes. The lithium extraction electrodes and the deintercalation electrodes are electrically connected through an external power supply.

[0012] The partition plate is provided with openings, and the openings between two adjacent partition plates are staggered vertically along the height direction of the lithium extraction tank, so that the lithium solution to be extracted flows in a baffled manner in the cathode main tank.

[0013] This disclosure adopts a "convection line" lithium extraction tank setup, with multiple lithium extraction tanks connected together and separated by partitions. The first partition has an opening (i.e., an aperture) near the bottom or top for the lithium extraction solution (such as brine) to enter. The second partition has an opening near the top or bottom, the third partition has an opening near the bottom or top, and so on. This arrangement of openings between the connected partitions, staggered vertically along the height of the partitions, allows the lithium extraction solution to circulate sequentially to the last lithium extraction tank in a "baffled flow" manner. This results in more complete flow of the lithium extraction solution and improved mass transfer, making it particularly suitable for lithium extraction from high-viscosity brine.

[0014] The following are optional technical solutions of this disclosure, but are not intended to limit the technical solutions provided by this disclosure. The technical objectives and beneficial effects of this disclosure can be better achieved through the following technical solutions.

[0015] As an optional technical solution of this disclosure, the anode main tank is provided with the partition plate, which divides the anode main tank into deintercalation tanks corresponding to each lithium extraction tank, and the number of deintercalation electrodes in the deintercalation tank is the same as the number of lithium extraction electrodes in the corresponding lithium extraction tank.

[0016] In this disclosure, insertion / extraction electrodes corresponding to the number of lithium extraction electrodes can be set in the main anode cell. Alternatively, a separator can be used to divide the main anode cell into multiple insertion / extraction cells. Each insertion / extraction cell and its corresponding lithium extraction cell undergo mass transfer through a separator, and the insertion / extraction electrodes in each insertion / extraction cell correspond to the lithium extraction electrodes in the corresponding lithium extraction cell. That is, the anode separator and the cathode separator can be the same or different, and are not limited to the same separator. In fact, the anode may not need to be equipped with a separator. Especially when the main cathode cell uses an independent unit or each lithium extraction cell uses an independent power supply, a separator may not be installed in the main anode cell.

[0017] In one embodiment, the first lithium extraction tank and the first deintercalation tank are each provided with a liquid inlet, and the last lithium extraction tank and the last deintercalation tank are each provided with a liquid outlet.

[0018] When using the lithium extraction and deintercalation tank described in this disclosure for lithium extraction, the lithium ion extraction rate has reached the target requirement when the lithium stream passes through the last lithium extraction tank. Therefore, the solution at this time can be discharged so that a new solution can be added from the inlet. This flow process can be continuously carried out by controlling the inlet speed, which can support continuous large-scale lithium extraction work.

[0019] In one embodiment, the number of lithium extraction tanks is 10 to 20, for example, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 or 20.

[0020] As an optional technical solution of this disclosure, the lithium extraction tank is divided into a high-concentration tank, a medium-concentration tank, and a low-concentration tank according to the change in lithium ion concentration in the lithium solution to be extracted in the cathode main tank.

[0021] In a baffled flow lithium extraction solution, the lithium ion concentration decreases continuously with the flow direction. Therefore, this disclosure divides the lithium extraction tank into sections. The lithium ion sieve material on the electrode plate in each lithium extraction tank is selected according to the concentration range of the brine passing through the tank. The section with high lithium ion concentration in the brine uses a lithium ion sieve material with good selectivity, high adsorption capacity, and stable chemical properties. The section with medium lithium ion concentration in the brine uses a lithium ion sieve material with good chemical stability but high capacity. The section with low lithium ion concentration in the brine uses a lithium ion sieve material with high ion diffusion coefficient but low capacity.

[0022] As an optional technical solution in this disclosure, the lithium ion concentration in the high-concentration tank is greater than 0.1 g / L, for example, 0.12 g / L, 0.17 g / L, 0.2 g / L, 0.25 g / L, 0.3 g / L, 0.35 g / L, 0.4 g / L, 0.45 g / L, or 0.5 g / L, etc., and the lithium ion concentration in the medium-concentration tank is 0.01 to 0.1 g / L, for example, 0.01 g / L, 0.02 g / L, 0.03 g / L, etc. / L, 0.04g / L, 0.05g / L, 0.06g / L, 0.07g / L, 0.08g / L, 0.09g / L, or 0.1g / L, etc., wherein the concentration of lithium ions in the low-concentration tank is less than 0.01g / L, such as 0.008g / L, 0.006g / L, 0.004g / L, or 0.002g / L, etc., but is not limited to the listed values; other unlisted values ​​within the above range also apply.

[0023] As an optional technical solution of this disclosure, the number of high-concentration tanks is 2 to 8, for example, 2, 3, 4, 5, 6, 7 or 8; the number of medium-concentration tanks is 1 to 9, for example, 1, 2, 3, 4, 5, 6, 7, 8 or 9; and the number of low-concentration tanks is 1 to 9, for example, 1, 2, 3, 4, 5, 6, 7, 8 or 9.

[0024] As an optional technical solution of this disclosure, the high-concentration tank is provided with a first lithium-ion sieve material, the medium-concentration tank is provided with a second lithium-ion sieve material, and the low-concentration tank is provided with a third lithium-ion sieve material.

[0025] Based on the adsorption capacity per unit mass, the first lithium-ion sieve material > the second lithium-ion sieve material > the third lithium-ion sieve material;

[0026] Based on the ion diffusion coefficient per unit mass, the first lithium-ion sieve material < the second lithium-ion sieve material < the third lithium-ion sieve material.

[0027] As an optional technical solution of this disclosure, the adsorption capacity of the first lithium-ion sieve material is 35-38 mg / g, such as 35 mg / g, 35.3 mg / g, 35.6 mg / g, 35.9 mg / g, 36.2 mg / g, 36.5 mg / g, 36.8 mg / g, 37.1 mg / g, 37.4 mg / g, 37.7 mg / g, or 38 mg / g, etc., and the adsorption capacity of the second lithium-ion sieve material is 30-33 mg / g, such as 30 mg / g, 30.3 mg / g, 30.6 mg / g, 30.9 mg / g, 31.2 mg / g, 3... The adsorption capacity of the third lithium-ion sieve material is 12-15 mg / g, such as 12 mg / g, 12.3 mg / g, 12.6 mg / g, 12.9 mg / g, 13.2 mg / g, 13.5 mg / g, 13.8 mg / g, 14.1 mg / g, 14.4 mg / g, 14.7 mg / g, or 15 mg / g, but it is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0028] As a preferred technical solution of this disclosure, the ion diffusion coefficient of the first lithium-ion sieve material is 10. -10 ~10 -11 cm 2 / s, for example, 10 -10 cm 2 / s、9*10 -11 cm 2 / s、8*10 -11 cm 2 / s、7*10 -11 cm 2 / s、6*10 -11 cm 2 / s、5*10 - 11 cm 2 / s、4*10 -11 cm 2 / s, 3*10 -11 cm 2 / s, 2*10 -11 cm 2 / s or 10 -11 cm 2 / s, etc., the ion diffusion coefficient of the second lithium ion sieve material is 10. -9 ~10-10 cm 2 / s, for example, 10 -9 cm 2 / s、9*10 -10 cm 2 / s、8*10 -10 cm 2 / s、7*10 -10 cm 2 / s、6*10 -10 cm 2 / s、5*10 -10 cm 2 / s、4*10 -10 cm 2 / s, 3*10 -10 cm 2 / s, 2*10 -10 cm 2 / s or 10 -10 cm 2 / s, etc., the ion diffusion coefficient of the third lithium ion sieve material is 10. -7 ~10 -8 cm 2 / s, for example, 10 -7 cm 2 / s、9*10 -8 cm 2 / s、8*10 -8 cm 2 / s、7*10 -8 cm 2 / s、6*10 -8 cm 2 / s、5*10 -8 cm 2 / s、4*10 -8 cm 2 / s, 3*10 -8 cm 2 / s, 2*10 -8 cm 2 / s or 10 -8 cm 2 / s, etc., but not limited to the listed values; other unlisted values ​​within the above range also apply.

[0029] As an optional technical solution of this disclosure, the first lithium-ion sieve material, the second lithium-ion sieve material and the third lithium-ion sieve material are physical adsorption materials or electrochemical adsorption materials.

[0030] In one embodiment, when the first lithium-ion sieve material, the second lithium-ion sieve material, and the third lithium-ion sieve material are electrochemical adsorption materials, the first lithium-ion sieve material, the second lithium-ion sieve material, and the third lithium-ion sieve material are respectively disposed on the lithium extraction electrode in the corresponding lithium extraction tank.

[0031] As an optional technical solution of this disclosure, when the first lithium-ion sieve material, the second lithium-ion sieve material, and the third lithium-ion sieve material are physical adsorption materials:

[0032] The first lithium-ion sieve material includes a manganese dioxide adsorbent; the second lithium-ion sieve material includes a lithium silicate adsorbent; and the third lithium-ion sieve material includes an aluminum hydroxide-based adsorbent.

[0033] As an optional technical solution of this disclosure, when the first lithium-ion sieve material, the second lithium-ion sieve material, and the third lithium-ion sieve material are electrochemical adsorption materials:

[0034] The first lithium-ion sieve material includes a manganese oxide lithium-ion sieve, such as lithium manganese oxide (LiMn2O4) or Li... 1.33 Mn 1.67 O4 or Li 1.6 Mn 1.6 At least one of O4; the second lithium-ion sieve material comprises any one or a combination of at least two of lithium cobalt oxide, lithium vanadate, or lithium iron phosphate, wherein typical but non-limiting examples of the combination include a combination of lithium cobalt oxide and lithium iron phosphate, a combination of lithium cobalt oxide and lithium vanadate, or a combination of lithium vanadate and lithium iron phosphate; the third lithium-ion sieve material comprises a titanium oxide lithium-ion sieve, such as lithium titanate Li2TiO3 and / or Li4Ti5O 12 .

[0035] It should be noted that the lithium-ion screen material in this disclosure needs to be selected according to the concentration range of the brine passing through the corresponding lithium extraction tank. The specific selection requirements are as described above. Those skilled in the art can make reasonable selections and adjustments based on the actual working conditions or implementation conditions. This application does not limit the first, second, and third lithium-ion screen materials to the specific substances listed above.

[0036] As an optional technical solution of this disclosure, each of the lithium extraction cells is equipped with a current and / or voltage monitor for monitoring the corresponding lithium extraction electrode.

[0037] In one embodiment, the current and / or voltage monitor is electrically connected to the host. The electrical connection means that it is connected to the host through an electrical signal transmission line, and the two communicate by exchanging electrical signals through the line. The host is used to analyze, store and display the working status and replacement information of the lithium extraction electrode.

[0038] As an optional technical solution of this disclosure, the openings on the partition are located near the top or bottom of the partition.

[0039] In one embodiment, along the height direction of the partition, the distance between the edge of the opening and the top or bottom of the partition is 5% to 10% of the height of the partition, such as 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, or 10%, but not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0040] In one embodiment, the radius of the opening is 3 to 8 cm, such as 3 cm, 3.5 cm, 4 cm, 4.5 cm, 5 cm, 5.5 cm, 6 cm, 6.5 cm, 7 cm, 7.5 cm or 8 cm, but is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0041] As an optional technical solution in this disclosure, the following steps are included:

[0042] The lithium extraction solution and hot gas are simultaneously introduced into the first lithium extraction tank and flow in a baffled manner in the cathode main tank to perform decreasing constant current electrolysis and / or decreasing constant voltage electrolysis for lithium extraction.

[0043] During the introduction of fresh lithium extraction solution into the lithium extraction tank, hot air is simultaneously introduced. This not only increases the temperature during the lithium extraction process but also agitates the solution, further promoting its flow and mass transfer, thus effectively improving the lithium extraction efficiency of the tank. It should be noted that since the delithiation rate in the anode main tank is much faster than the lithium extraction rate in the cathode main tank, a baffle plate is not required in the anode main tank, and hot air can be omitted.

[0044] As an optional technical solution of this disclosure, the decreasing constant current electrolytic lithium extraction includes the following: during the lithium extraction process, the working current of the lithium extraction electrode in the lithium extraction tank remains constant, and the working current of the lithium extraction electrode decreases sequentially or in segments along the flow direction of the lithium solution to be extracted.

[0045] In one embodiment, in the decreasing constant current electrolytic lithium extraction, the difference in operating current between two adjacent lithium extraction electrodes is 0.5 to 7A, such as 0.5A, 1A, 1.5A, 2A, 2.5A, 3A, 3.5A, 4A, 4.5A, 5A, 5.5A, 6A, 6.5A, or 7A, but is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0046] In one embodiment, the lithium extraction electrodes in the decreasing constant current electrolytic lithium extraction are connected in parallel, or each lithium extraction electrode is individually controlled by an independent power source to achieve constant current.

[0047] As an optional technical solution of this disclosure, the decreasing constant voltage electrolytic lithium extraction includes the following: during the process of electrolytic lithium extraction, the working voltage of the lithium extraction electrode in the lithium extraction tank remains constant, and the working voltage of the lithium extraction electrode decreases sequentially or in segments along the flow direction of the lithium solution to be extracted.

[0048] In one embodiment, in the decreasing constant voltage electrolytic lithium extraction, the difference in operating voltage between two adjacent lithium extraction electrodes is 0.05 to 0.15V, such as 0.05V, 0.06V, 0.07V, 0.08V, 0.09V, 0.1V, 0.11V, 0.12V, 0.13V, 0.14V, or 0.15V, but is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0049] One of the objectives of this disclosure is to divide the solution by partitions so that the concentration of the lithium-to-lime solution gradually decreases along the flow direction. Therefore, the operating parameters of the lithium extraction electrode should be adjusted according to the actual concentration of the lithium-to-lime solution in the extraction tank. For cases where the lithium-ion concentration in two or three adjacent tanks or within a certain section does not change significantly, the extraction tank can also be segmented or partitioned. Taking a decreasing constant current electrolysis as an example, after segmentation, the operating current of the lithium extraction electrode in each segment is the same, and along the solution flow direction, the operating current of the lithium extraction electrode between adjacent segments decreases sequentially. Regardless of the method, the operating current in the first extraction tank is determined by the initial concentration of the lithium-to-lime solution; the higher the concentration, the larger the initial current value. The number of extraction tanks and the magnitude of the operating current change need to be adjusted according to the actual lithium extraction target and effect, so that the lithium-ion concentration in the solution in the last extraction tank is reduced below the target requirement. Therefore, the key to this disclosure is to maintain the overall decreasing trend of the operating current of the lithium extraction electrode along the solution flow direction. Similarly, the change in operating voltage in decreasing constant voltage electrolysis can also be segmented and decreasing.

[0050] In one embodiment, the lithium extraction electrodes in the decreasing constant voltage electrolytic lithium extraction are connected in series.

[0051] Secondly, this disclosure provides an application of the lithium extraction and deintercalation tank as described in the first aspect for lithium extraction. The application of the lithium extraction and deintercalation tank for lithium extraction includes: dividing the cathode main tank into a front section and a rear section along the flow direction of the lithium solution to be extracted; the lithium extraction tank in the front section performs the decreasing constant current electrolysis lithium extraction; and the lithium extraction tank in the rear section performs the decreasing constant voltage lithium extraction.

[0052] The lithium extraction cell disclosed herein is preferably configured to operate with different constant currents from high to low, or with constant current in the first stage and constant voltage in the second stage, from front to back (i.e., from the inlet to the outlet of the cathode main tank). Compared with the power supply methods in related technologies that first apply constant current and then constant voltage to an electrode, or perform segmented constant current supply, this application is more flexible and energy-saving, avoiding the cumbersome operation of changing the power supply method for the electrode.

[0053] In one embodiment, the ratio of the number of lithium extraction tanks in the front section to the number of lithium extraction tanks in the rear section is greater than or equal to 2, such as 2, 3, 4, 5, 6, 7 or 8, but is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0054] As an optional technical solution of this disclosure, the lithium solution to be extracted includes brine.

[0055] In one embodiment, the concentration of lithium ions in the brine is 0.2–0.8 g / L, such as 0.2 g / L, 0.25 g / L, 0.3 g / L, 0.35 g / L, 0.4 g / L, 0.45 g / L, 0.5 g / L, 0.55 g / L, 0.6 g / L, 0.65 g / L, 0.7 g / L, 0.75 g / L, or 0.8 g / L, but is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0056] In one embodiment, the flow rate of the lithium solution to be extracted is 1 to 5 L / h, such as 1 L / h, 1.5 L / h, 2 L / h, 2.5 L / h, 3 L / h, 3.5 L / h, 4 L / h, 4.5 L / h, or 5 L / h, but is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0057] In one embodiment, the temperature of the hot air is 35 to 40°C, such as 35°C, 36°C, 37°C, 38°C, 39°C, or 40°C, but is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0058] In one embodiment, the hot gas comprises air and / or an inert gas.

[0059] In one embodiment, the flow rate ratio of the hot gas to the lithium solution to be extracted is 1:(1-2), such as 1:1, 1:1.1, 1:1.2, 1:1.3, 1:1.4, 1:1.5, 1:1.6, 1:1.7, 1:1.8, 1:1.9 or 1:2, but is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0060] In one embodiment, the application further includes, while simultaneously introducing the lithium extraction solution and hot gas into the first lithium extraction tank, introducing pure water and / or sodium chloride solution into the anode main tank.

[0061] When a baffle is also installed in the main anode tank, pure water and / or sodium chloride solution are introduced from the inlet of the first deintercalation tank.

[0062] As an optional technical solution of this disclosure, during the process of lithium electrolysis, the current and / or voltage of the lithium extraction electrode in the lithium extraction cell are monitored, and when the preset value is exceeded, the corresponding lithium extraction electrode is replaced.

[0063] This disclosure has at least the following beneficial effects:

[0064] (1) The lithium extraction and deintercalation tank described in this disclosure is set up with multiple lithium extraction tanks connected in a "production line" manner, so that the lithium solution to be extracted in the lithium extraction tank flows in a "baffle" manner and the lithium ion concentration is distributed from high to low. Thus, according to the different lithium ion concentrations in each lithium extraction tank, the lithium ion sieve material corresponding to the lithium extraction electrode is rationally allocated, thereby reducing costs while extracting lithium efficiently.

[0065] (2) The lithium extraction deintercalation and extraction groove described in this disclosure is used to extract lithium by matching different working currents and / or voltages to lithium extraction electrodes, performing decreasing constant current electrolysis for lithium extraction, or performing decreasing constant current electrolysis for lithium extraction in the front stage and decreasing constant voltage electrolysis for lithium extraction in the back stage. Compared with the related technologies, which perform constant current and then constant voltage on an electrode or segmented constant current power supply on an electrode, this solution is more flexible and avoids the cumbersome operation of changing the power supply mode of the electrode.

[0066] (3) The lithium extraction and deintercalation tank described in this disclosure is used for lithium extraction. During the process of introducing fresh lithium solution to be extracted, hot gas is also introduced. Combined with the "baffle" flow mode, the lithium solution to be extracted flows fully, the mass transfer effect of the solution is improved, and the lithium extraction efficiency of the electrolytic cell is effectively improved.

[0067] After reading and understanding the accompanying diagrams and detailed descriptions, the other aspects can be understood. Attached Figure Description

[0068] The accompanying drawings are used to provide a further understanding of the technical solutions in this paper and form part of the specification. They are used together with the embodiments of this application to explain the technical solutions in this paper and do not constitute a limitation on the technical solutions in this paper.

[0069] Figure 1 This is a schematic diagram of the cathode main tank in the lithium extraction and deintercalation tank of Example 1;

[0070] Figure 2 This is a schematic diagram of the cathode main tank in the lithium extraction and deintercalation tank of Example 2;

[0071] Figure 3 These are top views of the lithium extraction and deintercalation grooves in Examples 1 and 2;

[0072] Figure 4 This is a top view schematic diagram of the lithium extraction and deintercalation groove in Example 4;

[0073] In the diagram: 1-Cathode main tank, 11-Inlet, 12-Outlet, 2-Baffle, 21-Opening, 3-Diaphragm, 4-Lithium extraction electrode, 5-Intercalation / deintercalation electrode, 6-Lithium solution to be extracted, 7-External power supply, 8-Anode main tank. Detailed Implementation

[0074] The technical solutions of this disclosure will be further described below with reference to the accompanying drawings and specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of this disclosure and should not be construed as specific limitations thereof.

[0075] Example 1

[0076] This embodiment provides a lithium extraction and deintercalation method and its application, such as... Figure 1 and Figure 3 As shown:

[0077] The lithium extraction and deintercalation tank includes a cathode main tank 1, an anode main tank 8, and a diaphragm 3 between the cathode main tank 1 and the anode main tank 8; a partition 2 is provided in the cathode main tank 1, which divides the cathode main tank 1 into 15 sequentially connected lithium extraction tanks; a partition 2 is also provided in the anode main tank 8, which divides the anode main tank 8 into 15 sequentially connected deintercalation tanks corresponding to the lithium extraction tanks; the first lithium extraction tank and the first deintercalation tank are each provided with a liquid inlet 11, and the last lithium extraction tank and the last deintercalation tank are each provided with a liquid outlet 12;

[0078] The lithium extraction cell is provided with lithium extraction electrodes 4, which are electrically connected in parallel; the deintercalation cell is provided with deintercalation electrodes 5, which are electrically connected in parallel, and the lithium extraction electrodes 4 and the deintercalation electrodes 5 are electrically connected through an external power supply 7.

[0079] The partition 2 is provided with openings 21. The openings 21 between two adjacent partitions 2 are staggered vertically along the height direction of the lithium extraction tank or the extraction tank. The opening 21 of the first partition 2 is located 10cm from the top of the partition 2 and is a circle with a radius of 5cm. The opening 21 of the second partition 2 is located 10cm from the bottom of the partition 2 and is a circle with a radius of 5cm. The opening 21 of the third partition 2 is the same as that of the first partition 2. A total of 15 partitions 2 are provided, so that the lithium solution 6 to be extracted flows in a baffled manner in the cathode main tank 1 and the anode main tank 8.

[0080] Along the flow direction of the lithium solution 6 to be extracted, the lithium extraction tank is divided into 5 high-concentration tanks, 5 medium-concentration tanks, and 5 low-concentration tanks according to the change in lithium ion concentration. The lithium ion sieve material of the lithium extraction electrode 4 in the high-concentration tank is LiMn2O4, which has high adsorption capacity and good selectivity. The lithium ion sieve material of the lithium extraction electrode 4 in the medium-concentration tank is lithium iron phosphate, which has good chemical stability, relatively low ion diffusion coefficient, and high capacity. The lithium ion sieve material of the lithium extraction electrode 4 in the low-concentration tank is Li2TiO3, which has high diffusion coefficient, good stability, but low capacity.

[0081] Each of the lithium extraction cells is equipped with a voltage monitor for monitoring the corresponding lithium extraction electrode 4; the voltage monitor is electrically connected to the host computer, which is used to analyze, store and display the working status and replacement information of the lithium extraction electrode 4.

[0082] The application of lithium extraction and deintercalation in this embodiment includes the following steps:

[0083] The lithium extraction solution 6 and hot air are simultaneously introduced into the first lithium extraction tank and flow in a baffled manner in the cathode main tank 1. At the same time, pure water is introduced into the first deintercalation tank and flows in a baffled manner in the anode main tank 8. The lithium extraction solution 6 is a brine with a lithium ion concentration of 0.5 g / L and a flow rate of 3 L / h. The hot air is hot air with a temperature of 37°C and a flow rate of 4.5 L / h.

[0084] The working current of the lithium extraction electrode 4 is set according to Table 1. The lithium extraction electrode 4 in the first lithium extraction cell is the first lithium extraction electrode 4, and its working current is recorded as A1. The second lithium extraction cell is adjacent to the first lithium extraction cell in the direction close to the anode area, and its working current is recorded as A2. A1>A2, and so on, to perform decreasing constant current electrolysis lithium extraction.

[0085] Table 1

[0086] Lithium extraction electrode Current Lithium extraction electrode Current Lithium extraction electrode Current The first one 30A The 6th 20A The 11th 10A The second one 28A The 7th 18A The 12th 8A The 3rd one 26A The 8th 16A The 13th 6A The 4th 24A The 9th 14A The 14th 4A The 5th 22A The 10th 12A The 15th 2A

[0087] When the real-time operating voltage of the lithium extraction electrode 4 in a lithium extraction cell exceeds the set safety constant voltage of 0.8V, the voltage monitor will issue an alarm and replace the lithium extraction electrode 4 accordingly until the electrolytic lithium extraction is completed.

[0088] Example 2

[0089] This embodiment provides a lithium extraction and deintercalation method and its application, such as... Figure 2 and Figure 3 As shown:

[0090] The lithium extraction and deintercalation tank includes a cathode main tank 1, an anode main tank 8, and a diaphragm 3 between the cathode main tank 1 and the anode main tank 8. A partition 2 is provided inside the cathode main tank 1, dividing it into 15 sequentially connected lithium extraction tanks. A partition 2 is also provided inside the anode main tank 8, dividing it into 15 sequentially connected deintercalation tanks corresponding to the lithium extraction tanks. A lithium extraction electrode 4 is provided in each lithium extraction tank, and a deintercalation electrode 5 is provided in each deintercalation tank. The lithium extraction electrode 4 and the deintercalation electrode 5 are electrically connected via an external power supply 7. The first lithium extraction tank and the first deintercalation tank are each provided with an inlet 11, and the last lithium extraction tank and the last deintercalation tank are each provided with an outlet 12.

[0091] The partition 2 is provided with openings 21. The openings 21 between two adjacent partitions 2 are staggered vertically along the height direction of the lithium extraction tank or the extraction tank. The opening 21 of the first partition 2 is located 10cm from the top of the partition 2 and is a circle with a radius of 5cm. The opening 21 of the second partition 2 is located 10cm from the bottom of the partition 2 and is a circle with a radius of 5cm. The opening 21 of the third partition 2 is the same as that of the first partition 2. A total of 15 partitions 2 are provided, so that the lithium solution 6 to be extracted flows in a baffled manner in the cathode main tank 1 and the anode main tank 8.

[0092] Along the flow direction of the lithium solution 6 to be extracted, the lithium extraction tank is divided into 5 high-concentration tanks, 5 medium-concentration tanks, and 5 low-concentration tanks according to the change in lithium ion concentration. The lithium ion sieve material of the lithium extraction electrode 4 in the high-concentration tank is LiMn2O4, which has high adsorption capacity and good selectivity. The lithium ion sieve material of the lithium extraction electrode 4 in the medium-concentration tank is lithium iron phosphate, which has good chemical stability, relatively low ion diffusion coefficient, and high capacity. The lithium ion sieve material of the lithium extraction electrode 4 in the low-concentration tank is Li2TiO3, which has high diffusion coefficient, good stability, but low capacity.

[0093] Along the flow direction of the lithium solution 6 to be extracted, the lithium extraction electrode 4 in the first lithium extraction tank is the first lithium extraction electrode 4, the lithium extraction electrode 4 in the second lithium extraction tank is the second lithium extraction electrode 4, and so on; at the same time, the cathode main tank 1 is divided into a front section and a rear section. The front section includes the first to tenth lithium extraction electrodes 4, and the rear section includes the eleventh to fifteenth lithium extraction electrodes 4; the lithium extraction electrodes 4 in the front section are connected in parallel, and the lithium extraction electrodes 4 in the rear section are connected in series.

[0094] Each of the lithium extraction cells is equipped with a voltage monitor for monitoring the corresponding lithium extraction electrode 4; the voltage monitor is electrically connected to the host computer, which is used to analyze, store and display the working status and replacement information of the lithium extraction electrode 4.

[0095] The application of lithium extraction and deintercalation in this embodiment includes the following steps:

[0096] The lithium extraction solution 6 and hot air are simultaneously introduced into the first lithium extraction tank and flow in a baffled manner in the cathode main tank 1. At the same time, sodium chloride solution is introduced into the first deintercalation tank and flows in a baffled manner in the anode main tank 8. The lithium extraction solution 6 is brine with a lithium ion concentration of 0.5 g / L and a brine flow rate of 3 L / h. The hot air is hot air with a temperature of 40°C and a flow rate of 6 L / h.

[0097] The operating current and operating voltage of the lithium extraction electrode 4 are set according to Table 2. The operating current of the first lithium extraction electrode 4 is denoted as A1, the operating current of the second lithium extraction electrode 4 is denoted as A2, A1 > A2, and so on. The operating voltage of the eleventh lithium extraction electrode 4 is denoted as V1, the operating voltage of the twelfth lithium extraction electrode 4 is denoted as V2, and so on. The lithium extraction tank in the front section performs the decreasing constant current electrolysis lithium extraction, and the lithium extraction tank in the rear section performs the decreasing constant voltage lithium extraction.

[0098] Table 2

[0099]

[0100]

[0101] When the real-time operating voltage of the lithium extraction electrode 4 in a lithium extraction cell exceeds the set safety constant voltage of 0.8V, the voltage monitor will issue an alarm and replace the lithium extraction electrode 4 accordingly until the electrolytic lithium extraction is completed.

[0102] Example 3

[0103] This embodiment provides a lithium extraction and deintercalation groove and its application. The lithium extraction and deintercalation groove is exactly the same as in Embodiment 1, except that the application differs from that in Embodiment 1 as follows:

[0104] Set the working voltage of the lithium extraction electrode 4 according to Table 3. The lithium extraction electrode 4 in the first lithium extraction tank is the first lithium extraction electrode 4, and its working voltage is recorded as V1. The lithium extraction electrode 4 in the second lithium extraction tank is the second lithium extraction electrode 4, and its working voltage is recorded as V2. V1>V2, and so on, to carry out decreasing constant voltage electrolytic lithium extraction.

[0105] Table 3

[0106] Lithium extraction electrode Voltage Lithium extraction electrode Voltage Lithium extraction electrode Voltage The first one 0.8V The 6th 0.55V The 11th 0.3V The second one 0.75V The 7th 0.50V The 12th 0.25V The 3rd one 0.7V The 8th 0.45V The 13th 0.2V The 4th 0.65V The 9th 0.4V The 14th 0.15V The 5th 0.6V The 10th 0.35V The 15th 0.1V

[0107] Apart from the above, all other conditions are exactly the same as in Example 1.

[0108] Example 4

[0109] This embodiment provides a lithium extraction and deintercalation method and its application, such as... Figure 4As shown, the main anode tank 8 of the lithium extraction and deintercalation tank does not have a partition 2. Apart from that, the other conditions are exactly the same as in Example 1.

[0110] Comparative Example 1

[0111] This comparative example provides a lithium extraction and deintercalation cell and its application. The lithium extraction and deintercalation cell is exactly the same as in Example 1. The difference between the application and Example 1 is that the operating current of all lithium extraction electrodes 4 is set to 25A, while other conditions are exactly the same as in Example 1.

[0112] Comparative Example 2

[0113] This comparative example provides a lithium extraction and deintercalation cell and its application. The lithium extraction and deintercalation cell is exactly the same as in Example 1. The difference between the application and Example 1 is that the operating current of all lithium extraction electrodes 4 is set to 1A, and other conditions are exactly the same as in Example 1.

[0114] Comparative Example 3

[0115] This comparative example provides a lithium extraction and deintercalation tank and its application. The difference between the lithium extraction and deintercalation tank and Example 1 is that the openings 21 of all the partitions 2 are uniformly set to be 10cm from the bottom of the partitions 2, and are circular with a radius of 5cm, so as to prevent the lithium extraction solution 6 from flowing in a baffled manner. Apart from this, the other conditions and application parameters of the lithium extraction and deintercalation tank are exactly the same as those of Example 1.

[0116] Comparative Example 4

[0117] This comparative example provides a lithium extraction and deintercalation cell and its application. The difference between the lithium extraction and deintercalation cell and Example 1 is that the lithium ion sieve material of all lithium extraction electrodes 4 is set to LiMn2O4. Apart from this, the other conditions and application parameters of the lithium extraction and deintercalation cell are exactly the same as those of Example 1.

[0118] Comparative Example 5

[0119] This comparative example provides a lithium extraction and deintercalation cell and its application. The difference between the lithium extraction and deintercalation cell and Example 1 is that the lithium ion sieve material of all lithium extraction electrodes 4 is set to Li2TiO3. Apart from this, the other conditions and application parameters of the lithium extraction and deintercalation cell are exactly the same as those of Example 1.

[0120] Comparative Example 6

[0121] This comparative example provides a lithium extraction and deintercalation tank and its application. The difference between the lithium extraction and deintercalation tank and Example 1 is that hot gas is not used, and only the lithium extraction solution 6 is introduced. Apart from this, the other conditions and application parameters of the lithium extraction and deintercalation tank are exactly the same as those of Example 1.

[0122] After the same amount of brine was introduced for lithium extraction, the concentration of remaining lithium ions in the last lithium extraction tank of the test example and comparative example solutions was measured, and the lithium extraction rate was calculated. The results are shown in Table 4.

[0123] Table 4

[0124] project Remaining lithium-ion concentration (g / L) Lithium extraction rate (%) Example 1 0.0012 99.76 Example 2 0.0014 99.72 Example 3 0.0089 98.22 Example 4 0.0012 99.76 Comparative Example 1 0.0027 99.46 Comparative Example 2 0.2102 57.96 Comparative Example 3 0.0094 98.12 Comparative Example 4 0.0042 99.16 Comparative Example 5 0.0045 99.10 Comparative Example 6 0.0040 99.20

[0125] As can be seen from Table 1:

[0126] As can be seen from the remaining lithium-ion concentrations of Examples 1-3, the preferred power supply method for the electrolytic cell in this scheme is different constant current sections. Compared with Example 4, Example 1 shows that the presence or absence of a separator at the anode has no impact on the results of this scheme. Compared with Comparative Example 1, the power supply method of Comparative Example 1 is a continuous high current, which makes the electrode plate prone to exceeding the safe voltage, affecting lithium extraction, and resulting in higher energy consumption and cost. Comparative Example 2 uses a low current, resulting in extremely low lithium extraction efficiency. In Comparative Example 3, the openings are all at the bottom, which causes the brine in the lithium extraction tank to flow too fast, making it impossible to extract lithium normally. Compared with Comparative Examples 4-5, in Example 1, using a high-capacity lithium-ion screen in low concentration will affect the lithium extraction efficiency, while using a low-capacity lithium-ion screen in high-concentration brine will increase the number of times the lithium-ion screen needs to be replaced, making the operation cumbersome. Compared with Comparative Example 6, the introduction of hot air to increase the temperature of the lithium extraction environment can better improve the lithium extraction efficiency.

Claims

1. A method for lithium extraction and deintercalation, comprising: A lithium extraction and deintercalation cell is provided, the lithium extraction and deintercalation cell comprising an anode main cell, a cathode main cell, and a diaphragm; The anode main tank is equipped with a de-intercalation electrode; The cathode main tank is equipped with a partition, which divides the cathode main tank into at least three lithium extraction tanks. The partition has openings, which are staggered vertically along the height of the lithium extraction tank between adjacent partitions, allowing the lithium solution to be extracted to flow in a baffled manner within the cathode main tank. Each lithium extraction tank is equipped with a lithium extraction electrode, the number of which corresponds to the number of insertion / extraction electrodes. The lithium extraction electrodes and the insertion / extraction electrodes are electrically connected via an external power supply. Based on the change in lithium ion concentration in the lithium solution to be extracted within the cathode main tank, the lithium extraction tank is divided into a high-concentration tank, a medium-concentration tank, and a low-concentration tank. The high-concentration tank contains a first lithium-ion sieve material, the medium-concentration tank contains a second lithium-ion sieve material, and the low-concentration tank contains a third lithium-ion sieve material. Comparing the adsorption capacity per unit mass, the first lithium-ion sieve material > the second lithium-ion sieve material > the third lithium-ion sieve material. Comparing the ion diffusion coefficient per unit mass, the first lithium-ion sieve material < the second lithium-ion sieve material < the third lithium-ion sieve material. The diaphragm is disposed between the anode main tank and the cathode main tank; The lithium extraction solution and hot gas are simultaneously introduced into the first lithium extraction tank and flow in a baffled manner in the cathode main tank to perform decreasing constant current electrolysis lithium extraction and / or decreasing constant voltage electrolysis lithium extraction. The decreasing constant current electrolytic lithium extraction method includes the following: during the lithium extraction process, the working current of the lithium extraction electrode in the lithium extraction tank remains constant, and the working current of the lithium extraction electrode decreases sequentially or in segments along the flow direction of the lithium solution to be extracted. The decreasing constant voltage electrolytic lithium extraction method includes the following: during the lithium extraction process, the working voltage of the lithium extraction electrode in the lithium extraction tank remains constant, and the working voltage of the lithium extraction electrode decreases sequentially or in segments along the flow direction of the lithium solution to be extracted.

2. The method for lithium extraction and deintercalation according to claim 1, wherein, The anode main tank is provided with the partition plate, which divides the anode main tank into deintercalation tanks corresponding to each lithium extraction tank. The number of deintercalation electrodes in the deintercalation tank is the same as the number of lithium extraction electrodes in the corresponding lithium extraction tank.

3. The method for lithium extraction and deintercalation according to claim 2, wherein, The first lithium extraction tank and the first deintercalation tank are both equipped with liquid inlets, and the last lithium extraction tank and the last deintercalation tank are both equipped with liquid outlets.

4. The method for lithium extraction and deintercalation according to claim 1, wherein, The number of lithium extraction cells is 10 to 20.

5. The method for lithium extraction using the lithium extraction and deintercalation method according to claim 1, wherein, The lithium ion concentration in the high-concentration tank is greater than 0.1 g / L; the lithium ion concentration in the medium-concentration tank is 0.01–0.1 g / L; and the lithium ion concentration in the low-concentration tank is less than 0.01 g / L.

6. The method for lithium extraction and deintercalation according to claim 1, wherein, The number of high-concentration tanks is 2 to 8; the number of medium-concentration tanks is 1 to 9; and the number of low-concentration tanks is 1 to 9.

7. The method for lithium extraction using the lithium extraction and deintercalation method according to claim 1, wherein, The adsorption capacity of the first lithium-ion sieve material is 35-38 mg / g; the adsorption capacity of the second lithium-ion sieve material is 30-33 mg / g; and the adsorption capacity of the third lithium-ion sieve material is 12-15 mg / g.

8. The method for lithium extraction using the lithium extraction and deintercalation method according to claim 1, wherein, The ion diffusion coefficient of the first lithium-ion sieve material is 10. -10 ~10 -11 cm 2 / s; the ion diffusion coefficient of the second lithium-ion sieve material is 10. -9 ~10 - 10 cm 2 / s; the ion diffusion coefficient of the third lithium-ion sieve material is 10. -7 ~10 -8 cm 2 / s.

9. The method for lithium extraction using the lithium extraction and deintercalation method according to claim 1, wherein, The first lithium-ion sieve material, the second lithium-ion sieve material, and the third lithium-ion sieve material are physical adsorption materials or electrochemical adsorption materials.

10. The method for lithium extraction using the lithium extraction and deintercalation method according to claim 9, wherein, When the first lithium-ion sieve material, the second lithium-ion sieve material, and the third lithium-ion sieve material are electrochemical adsorption materials, the first lithium-ion sieve material, the second lithium-ion sieve material, and the third lithium-ion sieve material are respectively disposed on the lithium extraction electrode in the corresponding lithium extraction tank.

11. The method for lithium extraction using the lithium extraction and deintercalation method according to claim 9, wherein, When the first lithium-ion sieve material, the second lithium-ion sieve material, and the third lithium-ion sieve material are physical adsorption materials, the first lithium-ion sieve material includes manganese dioxide adsorbent; the second lithium-ion sieve material includes lithium silicate adsorbent; and the third lithium-ion sieve material includes aluminum hydroxide-based adsorbent.

12. The method for lithium extraction using the lithium extraction and deintercalation method according to claim 9, wherein, When the first lithium-ion sieve material, the second lithium-ion sieve material, and the third lithium-ion sieve material are electrochemical adsorption materials, the first lithium-ion sieve material includes a manganese oxide lithium-ion sieve; the second lithium-ion sieve material includes any one or a combination of at least two of lithium cobalt oxide, lithium vanadium oxide, or lithium iron phosphate; and the third lithium-ion sieve material includes a titanium oxide lithium-ion sieve.

13. The method for lithium extraction using the lithium extraction and deintercalation method according to claim 12, wherein, The manganese oxide lithium ion sieve includes LiMn2O4 and Li 1.33 Mn 1.67 O4 or Li 1.6 Mn 1.6 At least one of O4.

14. The method for lithium extraction using the lithium extraction and deintercalation method according to claim 12, wherein, The titanium oxide lithium ion sieve includes Li2TiO3 and / or Li4Ti5O 12 .

15. The method for lithium extraction using the lithium extraction and deintercalation method according to claim 1, wherein, Each of the lithium extraction cells is equipped with a current and / or voltage monitor for monitoring the corresponding lithium extraction electrode.

16. The method for lithium extraction using the lithium extraction and deintercalation method according to claim 15, wherein, The current and / or voltage monitor is electrically connected to the host computer, which is used to analyze, store, and display the working status and replacement information of the lithium extraction electrode.

17. The method for lithium extraction using the lithium extraction and deintercalation method according to claim 1, wherein, The openings on the partition are located near the top or bottom of the partition.

18. The method for lithium extraction using the lithium extraction and deintercalation method according to claim 17, wherein, Along the height direction of the partition, the distance between the edge of the opening and the top or bottom end of the partition is 5% to 10% of the height of the partition.

19. The method for lithium extraction using lithium extraction and deintercalation according to any one of claims 1, 17, or 18, wherein, The radius of the opening is 3 to 8 cm.

20. The method for lithium extraction using the lithium extraction and deintercalation method according to claim 1, wherein, In the decreasing constant current electrolytic lithium extraction, the difference in operating current between two adjacent lithium extraction electrodes is 0.5 to 7 A.

21. The method for lithium extraction using the lithium extraction and deintercalation method according to claim 1, wherein, The lithium extraction electrodes in the decreasing constant current electrolytic lithium extraction process are connected in parallel.

22. The method for lithium extraction using the lithium extraction and deintercalation method according to claim 1, wherein, In the decreasing constant voltage electrolytic lithium extraction, the difference in working voltage between two adjacent lithium extraction electrodes is 0.05 to 0.15 V.

23. The method for lithium extraction using the lithium extraction and deintercalation method according to claim 1, wherein, The lithium extraction electrodes in the decreasing constant voltage electrolytic lithium extraction process are connected in series.

24. The method for lithium extraction using the lithium extraction and deintercalation method according to claim 1, wherein, Along the flow direction of the lithium solution to be extracted, the cathode main tank is divided into a front section and a rear section. The lithium extraction tank in the front section is subjected to the decreasing constant current electrolysis for lithium extraction, and the lithium extraction tank in the rear section is subjected to the decreasing constant voltage electrolysis for lithium extraction.

25. The method for lithium extraction using the lithium extraction and deintercalation method according to claim 24, wherein, The ratio of the number of lithium extraction tanks in the front section to the number of lithium extraction tanks in the rear section is greater than or equal to 2.

26. The method for lithium extraction using the lithium extraction and deintercalation method according to claim 1, wherein, The lithium solution to be extracted includes brine.

27. The method for lithium extraction using the lithium extraction and deintercalation method according to claim 26, wherein, The concentration of lithium ions in the brine is 0.2–0.8 g / L.

28. The method for lithium extraction using the lithium extraction and deintercalation method according to claim 1, wherein, The flow rate of the lithium solution to be extracted is 1–5 L / h.

29. The method for lithium extraction using the lithium extraction and deintercalation method according to claim 1, wherein, The temperature of the hot gas is 35–40°C.

30. The method for lithium extraction using the lithium extraction and deintercalation method according to claim 1, wherein, The hot gas includes air and / or an inert gas.

31. The method for lithium extraction using the lithium extraction and deintercalation method according to claim 1, wherein, The flow rate ratio of the hot gas to the lithium solution to be extracted is 1:(1-2).

32. The method for lithium extraction using the lithium extraction and deintercalation method according to claim 1, wherein, The application also includes, when the lithium extraction solution and hot gas are simultaneously introduced into the first lithium extraction tank, pure water and / or sodium chloride solution are introduced into the anode main tank.

33. The method for lithium extraction using the lithium extraction and deintercalation method according to claim 1, wherein, During the lithium electrolysis process, the current and / or voltage of the lithium extraction electrode in the lithium extraction cell are monitored. When the current exceeds the preset value, the corresponding lithium extraction electrode is replaced.

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