Lithium adsorbent and preparation method and application thereof

Abstract

The invention discloses a lithium adsorbent and a preparation method and application thereof. According to the preparation method of the lithium adsorbent provided by the invention, Al < 3 + > and Mg < 2 + > are subjected to complexing and coprecipitation in the presence of a complexing agent to obtain the magnesium-doped aluminum adsorbent. According to the preparation method of the lithium adsorbent provided by the invention, Al < 3 + > and Mg < 2 + > are co-precipitated under the action of the complexing agent by adding the complexing agent, the magnesium element is uniformly distributed in the adsorbent, the prepared magnesium-doped aluminum lithium adsorbent can improve the tolerance of the magnesium-doped aluminum lithium adsorbent to high-sulfate salt lake brine, chemical components in the magnesium-doped aluminum lithium adsorbent product are uniformly distributed, and the stability of the magnesium-doped aluminum lithium adsorbent product is improved. And the cost is lower.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium extraction materials, and in particular to a lithium adsorbent and a preparation method and application thereof. Background Art

[0002] There are currently several methods for extracting lithium resources from salt lake brine, including salt pan method, membrane method, adsorption method, extraction method, etc. Among them, the adsorption method is widely used due to its good selectivity and low pollution. Lithium adsorbents are divided into aluminum, manganese and titanium series. Titanium and manganese adsorbents require acid to elute the adsorbed lithium, while aluminum lithium adsorbents do not require an acid-base environment for the adsorption and desorption of lithium. They have the advantages of low dissolution loss and low acid-base consumption. They are currently the only lithium adsorbent that has been industrially applied, and are mainly used in chloride-type salt lake brines with a high magnesium-to-lithium ratio.

[0003] In the actual application of aluminum-based lithium adsorbents, it is found that when the sulfate concentration in the original brine is high, the adsorption capacity of the aluminum-based lithium adsorbent decreases significantly after multiple adsorption-desorption, or even loses its adsorption capacity. Adsorbent doping is one of the methods to improve the sulfate tolerance of the adsorbent. At present, there are still problems such as uneven composition, high cost, and long process flow in the preparation process of doped aluminum-based lithium adsorbents. Summary of the invention

[0004] The purpose of the present invention is to provide a lithium adsorbent and a preparation method and application thereof in order to overcome the defects of the above-mentioned prior art.

[0005] The present invention solves the technical problem by adopting the following technical solutions.

[0006] The present invention provides a method for preparing a lithium adsorbent, which comprises the following steps: 3+ and Mg 2+ The magnesium-aluminum-doped adsorbent is obtained by complexation and co-precipitation.

[0007] The present invention also provides a lithium adsorbent prepared according to the above preparation method.

[0008] The present invention also provides a lithium adsorbent prepared by the above preparation method or the use of the above lithium adsorbent in extracting lithium ions from a lithium-containing solution.

[0009] The present invention has the following beneficial effects:

[0010] The present invention provides a lithium adsorbent and a preparation method and application thereof. The present invention provides a method for preparing a lithium adsorbent, which comprises: in the presence of a complexing agent, 3+ and Mg 2+ The preparation method of the lithium adsorbent provided above comprises adding a complexing agent to make Al 3+ and Mg2+ Co-precipitation occurs under the action of the complexing agent, rather than Al 3+ and Mg 2+ Separate precipitation, doping magnesium into aluminum-based adsorbents can improve their tolerance to high sulfate lake brine, and the chemical composition of the product is more evenly distributed, the preparation process is shorter, and the cost is lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0012] Figure 1 Schematic diagram of the preparation process of lithium adsorbent;

[0013] Figure 2 The XRD spectrum of the lithium adsorbent prepared by the preparation method provided in Example 1-4. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be described clearly and completely below. If the specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be purchased commercially.

[0015] A lithium adsorbent provided in an embodiment of the present invention and its preparation method and application are described in detail below.

[0016] In a first aspect, an embodiment of the present invention provides a method for preparing a lithium adsorbent, which comprises: in the presence of a complexing agent, 3+ and Mg 2+ The magnesium-aluminum-doped adsorbent is obtained by complexation and co-precipitation.

[0017] Studies have shown that doping and modification of aluminum-based adsorbents, such as introducing metal cations into the aluminum-based skeleton, can improve the structural stability of the adsorbent, increase the lithium mass transfer rate and adsorption capacity, and thus improve the efficiency of lithium extraction. However, in the actual modification process, some studies have provided the introduction of Sc, Ga, Y, In, and La into aluminum-based adsorbents, but the cost of preparing adsorbents using raw materials containing the above elements is too high and is not suitable for large-scale lithium extraction applications. Other studies have provided the preparation of aluminum salt adsorbents containing polysaccharide compounds. This method directly adds an alkaline solution to a mixed solution of magnesium salts and aluminum salts for direct precipitation. Because the precipitation pH and hydroxide solubility product of magnesium salts and aluminum salts are different, direct precipitation will cause aluminum salts and magnesium salts to precipitate separately, rather than co-precipitate, and aluminum hydroxide is a colloid, which can easily cause uneven distribution of the chemical composition of the product. At the same time, a polysaccharide compound solution is also required, which increases the process flow and cost.

[0018] The inventor found through practice and analysis that: 3+ The precipitation pH is 3.4-4.7, and the solubility product of Al(OH)3 is 1.9*10 -33 Mg 2+ The precipitation pH is 9.1-11.1, and the solubility product of Mg(OH)2 is 1.2*10 -11 , so Al 3+ Mg 2+ It is easier to precipitate. If aluminum salt and magnesium salt are directly mixed with a precipitant, magnesium and aluminum will precipitate separately. At the same time, Al(OH)3 is a colloid, and the Mg(OH)2 generated later is not easy to disperse, which can easily cause the problem of difficult uniform distribution of the chemical components of the product. In order to improve the above defects, the embodiment of the present invention provides a method for preparing a lithium adsorbent, in the presence of a complexing agent, Al 3+ and Mg 2+ The magnesium element is evenly distributed in the aluminum adsorbent by complexation co-precipitation to obtain a magnesium-doped aluminum adsorbent. The above successful doping of magnesium into the aluminum adsorbent by complexation precipitation can improve its tolerance to high sulfate salt lake brine, and the chemical composition distribution of the obtained lithium adsorbent product is more uniform, the cost is lower, and it is more suitable for large-scale applications.

[0019] In some optional embodiments, it includes: flowing a mixed solution containing aluminum salt, magnesium salt, lithium salt and a complexing agent and an alkali solution into water in parallel to perform aluminum-magnesium co-precipitation to obtain a magnesium-doped aluminum adsorbent.

[0020] In some optional embodiments, the aluminum salt includes at least one of AlCl3 and Al(NO3)3, the magnesium salt includes at least one of MgCl2 and Mg(NO3)2, the lithium salt is LiCl, and the complexing agent is sulfosalicylic acid.

[0021] In some optional embodiments, the Al / Mg molar ratio in the mixed solution is 10 to 20, the Al / Li molar ratio is 1 to 2.5, and the amount of the complexing agent is 1 to 1.5 times the molar amount of Al in the aluminum salt. During the complexing coprecipitation process, if the Al / Mg molar ratio is too high, the tolerance of the prepared lithium adsorbent to sulfate ions is reduced; if the Al / Mg molar ratio is too low, the adsorption capacity of the prepared lithium adsorbent is reduced. If the Al / Li molar ratio is too high, the adsorption capacity of the prepared lithium adsorbent is reduced; if the Al / Li molar ratio is too low, the preparation cost increases. If the amount of complexing agent is too little, Al and Mg cannot be fully coprecipitated; if the amount is too much, the cost increases.

[0022] In some optional embodiments, the alkali solution includes at least one of a NaOH solution and a KOH solution, and the concentration of the alkali solution is 2 to 5 mol / L. During the complex coprecipitation process, if the concentration of the alkali solution is too low, the volume of the filtrate is large and the filtration time is long; if the concentration is too high, it is easy to cause local excess of alkali, aggravate the fluctuation of pH, and make pH difficult to control.

[0023] In some optional embodiments, the temperature of the complex coprecipitation is controlled to be 70-90°C, and the pH at the reaction end point is 9.5-11. During the complex coprecipitation process, if the precipitation temperature is too low, less Li is embedded in the lithium adsorbent, resulting in a low adsorption capacity; if the temperature is too high, the energy consumption cost increases. If the pH at the reaction end point is too low, the reactants are not completely precipitated; if the pH at the end point is too high, the generated Al(OH)3 will dissolve.

[0024] In some optional embodiments, the method further includes: washing the filter cake after filtering the reaction liquid with water of equal mass once, stirring and washing twice, and then drying the washed filter cake at 105° C. to obtain a magnesium-aluminum-doped adsorbent.

[0025] In a second aspect, an embodiment of the present invention provides a lithium adsorbent prepared according to the above-mentioned preparation method.

[0026] In some optional embodiments, the lithium adsorption capacity of the lithium adsorbent is 6 to 14 mg / g, and the amount of lithium adsorbed by the lithium adsorbent to SO4 2- After 30 cycles of adsorption-desorption of brine with a content of more than 40 g / L, the adsorption capacity decreased by 6% to 14%.

[0027] In a third aspect, an embodiment of the present invention provides a lithium adsorbent prepared by the above preparation method or the use of the above lithium adsorbent in extracting lithium ions from a lithium-containing solution.

[0028] In some optional embodiments, the lithium-containing solution includes at least one of salt lake brine, groundwater, seawater, or industrial lithium-containing wastewater.

[0029] In some optional embodiments, the salt lake brine type includes at least one of lithium chloride salt lake brine, lithium sulfate salt lake brine, and high sulfate salt lake brine, and preferably the salt lake type is high sulfate salt lake brine.

[0030] The present invention will be further described below in conjunction with the embodiments.

[0031] A method for preparing a lithium adsorbent, see Figure 1 , including the following steps:

[0032] 1. Prepare a mixed solution of aluminum salt (anhydrous or containing crystalline water of AlCl3, Al(NO3)3), magnesium salt (anhydrous or containing crystalline water of MgCl2, Mg(NO3)2), LiCl and complexing agent (sulfosalicylic acid), wherein the Al / Mg molar ratio is 10-20 and the Al / Li molar ratio is 1-2.5. The complexing agent is added at 1-1.5 times the molar amount of Al in the aluminum salt.

[0033] 2. Prepare alkali (NaOH, KOH) into a 2-5 mol / L solution to obtain alkaline solution.

[0034] 3. Add the mixed solution and alkali solution into a certain amount of water in parallel, maintain the temperature at 70-90°C, and the reaction end point pH is 9.5-11 to carry out complex coprecipitation reaction.

[0035] 4. After the reaction, the filter cake obtained after filtering the reactants is rinsed once with an equal mass of water and stirred and washed twice.

[0036] 5. The washed filter cake was dried at 105°C to obtain a magnesium-aluminum-doped adsorbent.

[0037] Example 1

[0038] A method for preparing a lithium adsorbent comprises the following steps:

[0039] 1. Prepare 1.5L mixed solution by mixing 0.5mol anhydrous AlCl3, 0.05mol anhydrous MgCl2, 0.5mol LiCl and 0.75mol complexing agent sulfosalicylic acid, wherein the molar ratio of Al / Mg is 10 and the molar ratio of Al / Li is 1. The complexing agent is added at 1.5 times the molar amount of Al.

[0040] 2. Prepare NaOH solution to a 4 mol / L solution.

[0041] 3. Add the mixed solution and alkali solution into 0.5L of water at a flow rate of 1L / h, adjust the flow rate of the alkali solution according to the pH of the solution, maintain the temperature at 90°C, and carry out complexation coprecipitation reaction with the reaction end point pH of 9.5.

[0042] 4. After the reaction is completed, rinse the filter cake after filtering the reactants with an equal mass of water once and stir and wash twice.

[0043] 5. The washed filter cake was dried at 105°C to obtain a magnesium-aluminum-doped adsorbent, which was recorded as sample a.

[0044] Example 2

[0045] A method for preparing a lithium adsorbent comprises the following steps:

[0046] 1. 0.2 mol AlCl3·6H2O, 0.01 mol MgCl2·6H2O, 0.16 mol LiCl and 0.2 mol complexing agent sulfosalicylic acid were prepared into 0.5 L mixed solution, wherein the Al / Mg molar ratio was 20, the Al / Li molar ratio was 1.25, and the complexing agent was added in an amount of 1 times the molar amount of Al.

[0047] 2. Prepare the base NaOH into a 5 mol / L solution.

[0048] 3. Add the mixed solution and alkali solution into 0.5L of water at a flow rate of 0.5L / h, adjust the flow rate of the alkali solution according to the pH of the solution, maintain the temperature at 80°C, and carry out complex coprecipitation reaction at the reaction end point pH of 11.

[0049] 4. After the reaction is completed, rinse the filter cake after filtering the reactants with an equal mass of water once and stir and wash twice.

[0050] 5. The washed filter cake was dried at 105°C to obtain a magnesium-aluminum-doped adsorbent, which was recorded as sample b.

[0051] Example 3

[0052] A method for preparing a lithium adsorbent comprises the following steps:

[0053] 1. Prepare 1L mixed solution by mixing 0.3molAl(NO3)3·9H2O, 0.02molMg(NO3)2·6H2O, 0.12mol LiCl and 0.36mol complexing agent sulfosalicylic acid, wherein the Al / Mg molar ratio is 15, the Al / Li molar ratio is 2.5, and the complexing agent is added in an amount 1.2 times the molar amount of Al.

[0054] 2. Prepare NaOH solution to a 3 mol / L solution.

[0055] 3. Add the mixed solution and alkali solution into 1L of water at a flow rate of 1L / h, adjust the flow rate of the alkali solution according to the pH of the solution, maintain the temperature at 75°C, and carry out complex coprecipitation reaction with the reaction end point pH of 10.

[0056] 4. After the reaction is completed, rinse the filter cake after filtering the reactants with an equal mass of water once and stir and wash twice.

[0057] 5. The washed filter cake was dried at 105°C to obtain a magnesium-aluminum-doped adsorbent, which was recorded as sample c.

[0058] Example 4

[0059] A method for preparing a lithium adsorbent comprises the following steps:

[0060] 1. 0.3 mol Al(NO3)3·9H2O, 0.02 mol Mg(NO3)2·6H2O, 0.12 mol LiCl and 0.36 mol complexing agent sulfosalicylic acid were prepared into 1L mixed solution, wherein the Al / Mg molar ratio was 15 and the Al / Li molar ratio was 2.5. The complexing agent was added at 1.2 times the molar amount of Al.

[0061] 2. Prepare the base KOH into a 2 mol / L solution.

[0062] 3. Add the mixed solution and alkali solution into 0.75L of water at a flow rate of 0.5L / h, adjust the flow rate of the alkali solution according to the pH of the solution, maintain the temperature at 70°C, and carry out complex coprecipitation reaction with the reaction end point pH of 10.

[0063] 4. After the reaction is completed, rinse the filter cake after filtering the reactants with an equal mass of water once and stir and wash twice.

[0064] 5. The washed filter cake was dried at 105°C to obtain a magnesium-aluminum-doped adsorbent, which was recorded as sample d.

[0065] The XRD spectra of the lithium adsorbent prepared by the method of Examples 1-4 are shown in Figure 2 ,from Figure 2 It can be seen that there is a diffraction peak of Mg(OH)2 in the lithium adsorbent, indicating that Mg exists in the prepared lithium adsorbent in the form of Mg(OH)2.

[0066] Comparative Example 1

[0067] A method for preparing a lithium adsorbent comprises the following steps:

[0068] 1. Prepare 0.1 mol anhydrous AlCl3, 0.004 mol anhydrous MgCl2, 0.2 mol LiCl and 0.05 mol sulfosalicylic acid into 0.5 L mixed solution, where the Al / Mg molar ratio is 25 and the Al / Li molar ratio is 0.5. Add the complexing agent at 0.5 times the molar amount of Al.

[0069] 2. Prepare NaOH into a 1 mol / L solution.

[0070] 3. Add the mixed solution and alkali solution into 1L water at a flow rate of 0.5L / h, adjust the flow rate of alkali solution according to the pH of the solution, maintain the temperature at 60°C, and carry out complex coprecipitation reaction with the reaction end point pH of 9.

[0071] 4. After the reaction is completed, rinse the filter cake after filtering the reactants with an equal mass of water once and stir and wash twice.

[0072] 5. The washed filter cake was dried at 105°C to obtain a magnesium-aluminum-doped adsorbent, which was recorded as sample e.

[0073] Comparative Example 2

[0074] A method for preparing a lithium adsorbent comprises the following steps:

[0075] 1. Prepare 1 mol Al(NO3)3·9H2O, 0.2 mol Mg(NO3)2·6H2O, 0.33 mol LiCl and 2 mol complexing agent sulfosalicylic acid into 1.5 L mixed solution, wherein the Al / Mg molar ratio is 5 and the Al / Li molar ratio is 3. The complexing agent is added at twice the molar amount of Al.

[0076] 2. Prepare KOH into a 6 mol / L solution.

[0077] 3. Add the mixed solution and alkali solution into 500 mL of water at a flow rate of 1 L / h, adjust the flow rate of the alkali solution according to the pH of the solution, maintain the temperature at 95°C, and carry out complex coprecipitation reaction with the reaction end point pH of 12.

[0078] 4. After the reaction is completed, rinse the filter cake after filtering the reactants with an equal mass of water once and stir and wash twice.

[0079] 5. The washed filter cake was dried at 105°C to obtain a magnesium-aluminum-doped adsorbent, which was recorded as sample f.

[0080] Comparative Example 3

[0081] A method for preparing a lithium adsorbent comprises the following steps:

[0082] 1. Prepare 1.5L mixed solution of 0.5mol anhydrous AlCl3, 0.05mol anhydrous MgCl2 and 0.5mol LiCl, wherein the molar ratio of Al / Mg is 10 and the molar ratio of Al / Li is 1.

[0083] 2. Prepare NaOH solution to a 2 mol / L solution.

[0084] 3. Add the mixed solution and alkali solution into 1L of water at a flow rate of 1L / h, adjust the flow rate of the alkali solution according to the pH of the solution, maintain the temperature at 90°C, and carry out co-precipitation reaction with the reaction end point pH of 9.5.

[0085] 4. After the reaction is completed, rinse the filter cake after filtering the reactants with an equal mass of water once and stir and wash twice.

[0086] 5. The washed filter cake was dried at 105°C to obtain a magnesium-aluminum-doped adsorbent, recorded as sample g.

[0087] Comparative Example 4

[0088] A method for preparing a lithium adsorbent comprises the following steps:

[0089] The lithium adsorbent was prepared by the method provided in CN108993376A and recorded as sample h.

[0090] The sample adsorption capacity determination includes the following steps:

[0091] 1. Take 10 g of each lithium adsorbent sample numbered a to h and add them into 500 mL of brine, and stir at 200 rpm for 3 h.

[0092] 2. Filter and separate the lithium adsorbent and brine, and send the filtrate for analysis. Rinse the lithium adsorbent once with an equal volume of deionized water to wash out the entrained brine.

[0093] 3. Place the lithium adsorbent in 500 mL of deionized water, stir at 200 rpm for 3 hours to desorb the lithium ions in the adsorbent, then filter and separate them, and send the desorbed liquid for inspection and analysis.

[0094] 4. Steps 1 to 3 are one adsorption-desorption process, and the above adsorption-desorption process is repeated 30 times.

[0095] The components of the brine used for adsorption during the determination of the adsorption capacity of the samples in the above embodiments and comparative examples are shown in Table 1 below.

[0096] Table 1

[0097] Li Na K Ca Mg Al <![CDATA[SO4 2- ]]> <![CDATA[Cl - ]]> B 0.42 72.7 83.5 0.36 14.5 ND 44.2 158.6 0.17

[0098] The components of the samples prepared in the above examples and comparative examples are shown in Table 2 below.

[0099] Table 2

[0100] Sample name Li / % Al / ％ Mg / % Cl / ％ Sample a 4.38 28.08 2.32 21.77 Sample b 3.54 29.11 1.27 17.95 Sample c 2.47 28.54 1.64 12.40 Sample d 1.85 28.29 1.59 9.29 Sample 5.93 26.95 0.31 30.07 Sample f 1.61 27.35 3.13 8.19 Sample g 4.31 28.16 0.86 21.68 Sample h 2.05 28.84 - 10.21

[0101] The adsorption capacity of the samples prepared in the above embodiments and comparative examples for lithium in brine is shown in Table 3 below.

[0102] Table 3

[0103]

[0104]

[0105] Combining the above Tables 2 and 3, it can be seen that the samples synthesized in Examples 1 to 4 of the present invention have an adsorption capacity decrease of 6% to 14% after 30 adsorption-desorption cycles, the adsorption capacity of the lithium adsorbent prepared by the methods provided in Comparative Examples 1 to 3 decreases or the rate of decrease of the adsorption capacity increases, and the lithium adsorbent prepared by the method provided in Comparative Example 4 not only decreases in adsorption capacity, but also decreases in adsorption capacity by 71% after 30 adsorption-desorption cycles. This indicates that the lithium adsorbent synthesized by the scheme provided in the embodiments of the present invention has good tolerance to high sulfate salt lake brine.

[0106] The raw material dosage and cost of Examples 1 and 2 of Patent CN117000199A are compared with the raw material dosage and cost of Examples 1 and 2 of the present invention. The results are shown in Table 4 below.

[0107] Table 4

[0108]

[0109] It can be seen from Table 4 above that the cost of the lithium adsorbent synthesized by the method provided in Example 1 and Example 2 of the present invention is much lower than the synthesis cost of patent CN117000199A, indicating that the lithium adsorbent prepared by the scheme provided in the embodiment of the present invention has the advantage of low cost, which is conducive to its wide application in the field of lithium extraction from lithium-containing solutions.

[0110] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for preparing a lithium adsorbent, characterized in that: In the presence of a complexing agent, Al 3+ and Mg 2+ The magnesium-aluminum-doped adsorbent is obtained by complexation and co-precipitation.

2. The preparation method according to claim 1, characterized in that: It includes: A mixed solution containing aluminum salt, magnesium salt, lithium salt and complexing agent is flowed into water together with alkali solution to carry out aluminum-magnesium complex co-precipitation to obtain a magnesium-aluminum-doped adsorbent.

3. The preparation method according to claim 2, characterized in that: The aluminum salt includes at least one of AlCl3 and Al(NO3)3, the magnesium salt includes at least one of MgCl2 and Mg(NO3)2, the lithium salt is LiCl, and the complexing agent is sulfosalicylic acid; Preferably, the molar ratio of Al / Mg in the mixed solution is 10 to 20, the molar ratio of Al / Li is 1 to 2.5, and the amount of the complexing agent is 1 to 1.5 times the molar amount of Al in the aluminum salt.

4. The preparation method according to claim 2, characterized in that: The alkali solution includes at least one of a NaOH solution and a KOH solution; Preferably, the concentration of the alkali solution is 2-5 mol / L.

5. The preparation method according to claim 2, characterized in that: The temperature of the complexation coprecipitation is controlled to be 70-90°C, and the pH at the reaction end point is 9.5-11; Preferably, the method further comprises: washing the filter cake after filtering the reaction liquid with water of equal mass once, stirring and washing twice, and then drying the washed filter cake at 105° C. to obtain a magnesium-aluminum-doped adsorbent.

6. A lithium adsorbent prepared according to the preparation method according to any one of claims 1 to 5.

7. The lithium adsorbent according to claim 6, characterized in that The lithium adsorption capacity of the lithium adsorbent is 6 to 14 mg / g, and the adsorption capacity of the lithium adsorbent to SO4 2- After 30 cycles of adsorption-desorption of brine with a content of more than 40 g / L, the adsorption capacity decreased by 6% to 14%.

8. Use of the lithium adsorbent prepared by the preparation method according to any one of claims 1 to 5 or the lithium adsorbent according to any one of claims 6 to 7 in extracting lithium ions from a lithium-containing solution.

9. The use according to claim 8, characterized in that: The lithium-containing solution includes at least one of salt lake brine, groundwater, seawater or industrial lithium-containing wastewater.

10. The use according to claim 9, characterized in that: The salt lake brine type includes at least one of lithium chloride salt lake brine, lithium sulfate salt lake brine, and high sulfate salt lake brine; Preferably, the salt lake brine type is high sulfate salt lake brine.

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