A lithium adsorbent, its preparation method and application

Abstract

This invention discloses a lithium adsorbent, its preparation method, and its application, relating to the field of lithium extraction technology. The preparation method includes mixing an oil phase and an aqueous phase to obtain a lithium adsorbent intermediate; mixing the lithium adsorbent intermediate with an organic auxiliary agent to obtain the lithium adsorbent; wherein the oil phase includes a lithium source, an aluminum source, an oil phase matrix, and an oil phase auxiliary agent, and the oil phase matrix includes a polymer and vinylidene fluoride; the mixing step of the oil phase and the aqueous phase includes gradient stirring of the mixture. Through optimization and screening of a high-temperature resistant oil phase matrix and a specific preparation process, this invention can prepare a highly stable lithium adsorbent. Compared with existing lithium adsorbents, the lithium adsorbent prepared by this invention exhibits less degradation under high-temperature conditions, better mechanical strength, and stronger corrosion resistance, providing a pathway for the effective extraction of lithium resources from high-temperature, high-salinity brines.

Description

Technical Field

[0001] This invention relates to the field of lithium extraction technology, and more specifically, to a lithium adsorbent, its preparation method, and its application. Background Technology

[0002] Lithium resources are currently a core resource for new energy, but the supply and demand are consistently imbalanced, and the future is likely to see a long-term supply shortage. Therefore, lithium extraction from geothermal brines has become a new focus.

[0003] However, extracting lithium from geothermal brine is a major challenge. Extracting lithium from high-temperature geothermal brine requires solving the physical and chemical stability problems of the adsorbent. Current lithium adsorbents are prone to physical damage and chemical degradation in high-temperature environments, which limits their service life and makes the cost of industrial use of lithium adsorbents too high. There is an urgent need to develop adsorbents that can be used stably in high-temperature brine and extract lithium efficiently.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a lithium adsorbent, its preparation method, and its application.

[0006] This invention is implemented as follows:

[0007] In a first aspect, embodiments of the present invention provide a method for preparing a lithium adsorbent, comprising: mixing an oil phase and an aqueous phase to obtain a lithium adsorbent intermediate; and mixing the lithium adsorbent intermediate with an organic additive to obtain a lithium adsorbent. The oil phase comprises a lithium source, an aluminum source, an oil phase matrix, and an oil phase additive, wherein the oil phase matrix comprises a polymer and vinylidene fluoride; the mixing step of the oil phase and the aqueous phase comprises: gradient stirring of the mixture of the oil phase and the aqueous phase; the gradient stirring step comprises: stirring at an initial stirring speed of 30–190 rpm, pausing for a second set time after each first set stirring time; after each pause, reducing the stirring speed to a set speed 1 and continuing stirring until the stirring speed ≤ a set speed 2, wherein the set speed 2 is 10–30 rpm, and maintaining the set speed 2 at 40–120°C for stirring for 20–600 min.

[0008] Secondly, embodiments of the present invention provide a lithium adsorbent, comprising: a lithium adsorbent prepared by the preparation method described in the foregoing embodiments.

[0009] Thirdly, embodiments of the present invention provide the application of the lithium adsorbent as described in the foregoing embodiments in lithium extraction or the preparation of products for lithium extraction.

[0010] The present invention has the following beneficial effects:

[0011] This invention develops a novel preparation process that, by screening high-temperature resistant organic matrices and employing specific preparation techniques, produces a highly stable lithium adsorbent. Compared to existing lithium adsorbents, the lithium adsorbent prepared by this invention exhibits less degradation under high-temperature conditions, better mechanical strength, and stronger corrosion resistance, providing a pathway for the effective extraction of lithium resources from high-temperature, high-salinity brine. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is an electron microscope image of the lithium adsorbent prepared in Example 1. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0015] The novel lithium adsorbent prepared using this invention can achieve over 2000 adsorption-desorption cycles in 80°C high-temperature brine without degradation. Conventional lithium adsorbents show significant degradation after more than 100 adsorption-desorption cycles in 80°C high-temperature brine.

[0016] On one hand, embodiments of the present invention provide a method for preparing a lithium adsorbent, comprising: mixing an oil phase and an aqueous phase to obtain a lithium adsorbent intermediate; and mixing the lithium adsorbent intermediate with an organic additive to obtain a lithium adsorbent.

[0017] The oil phase includes a lithium source, an aluminum source, an oil phase matrix, and an oil phase additive. The oil phase matrix includes a polymer and vinylidene fluoride.

[0018] The mixing steps of the oil phase and the aqueous phase include: gradient stirring of the mixture of the oil phase and the aqueous phase; the gradient stirring steps include: stirring at an initial stirring speed of 30-190 rpm, pausing for a second set time after each set first stirring time; after each pause, reducing the stirring speed by a set speed 1 and continuing stirring until the stirring speed is ≤ a set speed 2, where the set speed 2 is 10-30 rpm, and maintaining the set speed 2 at 40-120°C for stirring for 20-600 min. By gradually reducing the stirring speed, the polymerization process can better confine the lithium alumina microcrystals, making the polymerization process of vinylidene fluoride in the oil droplets more gentle. Continuously reducing the stirring speed after the start of vinylidene fluoride polymerization prevents large collapse of the polymer structure in the oil droplets, and also reduces the amount of aluminum and lithium escaping into the aqueous phase.

[0019] The lithium adsorbent prepared by the method provided in this invention achieves its high-temperature resistance primarily through two aspects. Firstly, it utilizes a special organic matrix. Vinylidene fluoride (PVDF) is less prone to chain breakage at high temperatures. The resin matrix is ​​also less susceptible to chemical damage. Using it as the oil-phase matrix in combination with polymers further facilitates the binding of lithium aluminum hydroxide (lithium alumina) microcrystals. This stronger binding results in less active crystal release. Furthermore, the organic matrix framework undergoes minimal change during high-temperature adsorption and desorption, with less shrinkage and expansion during high-temperature adsorption and low-temperature desorption. This minimizes structural damage caused by repeated lithium ion adsorption and desorption at high temperatures. Secondly, a special preparation process is employed. During the preparation of the lithium adsorbent intermediate, gradient stirring is used during the mixing of the oil and aqueous phases. This results in a more uniform distribution of lithium alumina microcrystals within the adsorbent particles, strengthening the binding force on the active inorganic sites and reducing the escape of aluminum and lithium. This leads to more stable adsorption and desorption of lithium chloride at high temperatures.

[0020] In some embodiments, the initial stirring speed can be any one or a range between any two of 30, 40, 60, 80, 100, 120, 140, 160, 170, 180, and 190 rpm.

[0021] In some embodiments, the first set time is 20 to 120 minutes. Specifically, it can be any one or any two of 20, 40, 60, 80, 100, and 120 minutes.

[0022] In some embodiments, the second set time is 20 min to 120 min. Specifically, it can be any one or any two of 20, 40, 60, 80, 100, and 120 min.

[0023] In some embodiments, the set rotational speed 1 is 10 to 30 rpm. Specifically, it can be any one or any two of 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, and 30 rpm.

[0024] In some embodiments, the set rotational speed 2 is 10 to 30 rpm. Specifically, it can be any one or any two of 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, and 30 rpm.

[0025] In some embodiments, the stirring temperature before maintaining the set rotation speed 2 is 40–80°C. Specifically, it can be any one or any two of the following: 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, and 80°C.

[0026] In some embodiments, the stirring temperature after maintaining the set rotation speed 2 is any one or any two of the following: 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 105, 110, 115, and 120°C.

[0027] In some embodiments, the mass ratio of the polymer to the vinylidene fluoride in the oil phase matrix is ​​5:1 to 10. Specifically, it can be any one or any two of the following: 5:1, 5:2, 5:3, 5:4, 5:5, 5:6, 5:7, 5:8, 5:9, and 5:10.

[0028] In some embodiments, the polymer comprises any one or more of the following: polyacrylamide, polyacrylic acid, polyacrylate, polyurethane, polyester, polyether, polystyrene, polyenol, phenolic resin, and epoxy resin. Polystyrene or polyacrylate is preferred, as it has a stronger affinity for vinylidene fluoride and produces an adsorbent with superior strength.

[0029] In some embodiments, the total mass ratio of the lithium source and the aluminum source to the oil phase additive in the oil phase is 3 to 18:10. Specifically, this mass ratio can be any one or a range between any two of the following: 3:10, 4:10, 6:10, 8:10, 10:10, 12:10, 14:10, 16:10, and 18:10.

[0030] In some embodiments, the oil phase additive includes N-methylpyrrolidone and an organic solvent.

[0031] In some embodiments, the mass ratio of the N-methylpyrrolidone to the organic solvent is 1 to 5:1. Specifically, this mass ratio can be any one or a range between any two of 1:1, 2:1, 3:1, 4:1, and 5:1.

[0032] In some embodiments, the organic solvent in the oil phase additive includes any one or more of methanol, ethanol, acetone, gasoline, DMF, ethyl acetate, dichloromethane, chloroform, benzene, toluene, isopropanol, and diethyl ether.

[0033] In some embodiments, the mixing volume ratio of the oil phase and the aqueous phase is 1:1 to 3. Specifically, this volume ratio can be any one of 1:1, 1:2, 1:3, or a range between any two of them.

[0034] In some embodiments, the molar ratio of the lithium source to the aluminum source is 5:1 to 10. Specifically, this molar ratio can be any one or any two of 5:1, 5:2, 5:3, 5:4, 5:5, 5:6, 5:7, 5:8, 5:9, and 5:10.

[0035] In some embodiments, the lithium source comprises a lithium salt.

[0036] In some embodiments, the lithium source includes any one or more of lithium chloride, lithium nitrate, lithium carbonate, lithium sulfate, lithium hydroxide, lithium acetate, and lithium oxide.

[0037] In some embodiments, the aluminum source comprises an aluminum salt.

[0038] In some embodiments, the aluminum source includes any one or more of aluminum chloride, aluminum nitrate, aluminum carbonate, aluminum sulfate, aluminum hydroxide, aluminum acetate, and aluminum oxide.

[0039] In some embodiments, the oil phase further includes at least one of an initiator and a porogen.

[0040] In some embodiments, the initiator includes any one or more of benzoyl peroxide, isobenzopropyl hydroperoxide, and tert-butyl hydroperoxide.

[0041] In some embodiments, the pore-forming agent includes any one or more of white oil, liquid wax, gasoline, and n-octane.

[0042] In some embodiments, the aqueous phase comprises water and a dispersant.

[0043] In some embodiments, the dispersant has a mass-volume fraction of 0.1% to 2% in the aqueous phase. Specifically, this mass-volume fraction can be any one or a range between any two of the following: 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 1.0%, 1.2%, 1.4%, 1.6%, 1.8%, and 2%. Specifically, mass-volume fraction = g / mL × 100%.

[0044] In some embodiments, the dispersant includes any one or more of carboxymethyl cellulose and hydroxyethyl cellulose.

[0045] In some embodiments, before mixing the obtained lithium adsorbent intermediate with the organic additive after mixing the oil phase and the aqueous phase, the preparation method further includes: washing the product after mixing the oil phase and the aqueous phase with detergent 1 to remove the pore-forming agent.

[0046] In some embodiments, the detergent 1 includes any one or more of methanol, ethanol, acetone, gasoline, DMF, ethyl acetate, dichloromethane, chloroform, benzene, toluene, isopropanol, and diethyl ether.

[0047] In some embodiments, the organic additives include any one or more of the following: polyvinyl alcohol, polylactic acid, cellulose acetate, ethyl cellulose, polyvinyl chloride, polycarbonate, ethylene alcohol-ethylene cellulose copolymer, and ethylene-propylene polymer.

[0048] In some embodiments, the mass ratio of the lithium adsorbent intermediate to the organic auxiliary is 20:1 to 8. Specifically, this mass ratio can be any one or any two of the following: 20:1, 20:2, 20:3, 20:4, 20:5, 20:6, 20:7, and 20:8.

[0049] In some embodiments, the mixing conditions of the lithium adsorbent intermediate and the organic additive include: a temperature of 30–80°C and a time of 1–6 hours. Specifically, the temperature can be any one or any two of the following: 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, and 80°C. Specifically, the time can be any one or any two of the following: 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, and 6 hours.

[0050] In some embodiments, the preparation method further includes adding a polar organic solvent to the mixture during the mixing of the lithium adsorbent intermediate with the organic additive.

[0051] In some embodiments, the polar organic solvent includes any one or more of ethanol, DMF, acetonitrile, and isopropanol.

[0052] In some embodiments, the concentration of the polar organic solvent is 15% to 35%. Specifically, it can be any one or any two of 15%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, and 35%.

[0053] In some embodiments, after mixing the lithium adsorbent intermediate with the organic additive, the preparation method further includes: washing the product after mixing the lithium adsorbent intermediate with the organic additive using detergent 2.

[0054] In some embodiments, the detergent 2 comprises water and / or an organic solvent. Optionally, the organic solvent in the detergent 2 comprises any one or more of the following: methanol, ethanol, acetone, gasoline, DMF, ethyl acetate, dichloromethane, chloroform, benzene, toluene, isopropanol, N-methylpyrrolidone, and diethyl ether.

[0055] In some embodiments, after washing with the detergent 2, the preparation method further includes drying the product washed with the detergent 2 to obtain the lithium adsorbent.

[0056] On the other hand, embodiments of the present invention also provide a lithium adsorbent, which includes: a lithium adsorbent prepared by the preparation method described in any of the foregoing embodiments.

[0057] Furthermore, embodiments of the present invention also provide the application of the lithium adsorbent as described in any of the foregoing embodiments in lithium extraction or in the preparation of products for lithium extraction;

[0058] In some embodiments, the lithium extraction includes lithium extraction under high-temperature conditions. In some embodiments, the high temperature is 50–85°C, specifically any one or any two of 50, 55, 60, 65, 70, 75, 80, and 85°C.

[0059] In some embodiments, the lithium extraction includes extracting lithium from high-temperature brine.

[0060] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0061] Example 1

[0062] A method for preparing a lithium adsorbent includes the following steps:

[0063] (1) Oil phase:

[0064] Take 50g of aluminum chloride (aluminum source) and add 100mL of a mixed solution of DMF and N-methylpyrrolidone (oil phase additive), wherein the mass ratio of DMF to N-methylpyrrolidone is 1:4. Add 70mL of 3mol / L LiOH solution (lithium source) while stirring, then add the oil phase matrix (30g polystyrene + 30g vinylidene fluoride) and stir to dissolve to obtain the oil phase. Add 2g of benzoyl peroxide (initiator) and 40g of liquid wax (porogen) to the oil phase and stir to mix for 20min to obtain the final oil phase.

[0065] (2) Aqueous phase:

[0066] Measure 300 mL of water and pour it into a 2000 mL reactor. Add 0.5 g of carboxymethyl cellulose (dispersant) and stir to dissolve it to form an aqueous phase.

[0067] (3) Lithium adsorbent intermediate:

[0068] The above-mentioned oil phase liquid is poured into the aqueous phase and subjected to gradient stirring to rapidly disperse it into spherical shapes. The gradient stirring includes: heating to 60°C, initial stirring speed of 180 rpm, pausing for 10 minutes every 2 hours, and then reducing the stirring speed by 20 rpm (minimum speed) when restarting the stirring. This process is repeated until the stirring speed is reduced to ≤20 rpm. The temperature is then raised to 80°C and maintained at 20 rpm for 2 hours. After the temperature is maintained, the spherical particles are filtered out.

[0069] (4) Lithium adsorbent:

[0070] 200g of isopropanol (detergent 1) was added to the spherical particles to wash away the liquid wax (porogen). Then, 15g of polylactic acid (organic additive) was dissolved in 300g of a polar organic solvent containing water and ethanol (volume ratio 1:1) to obtain a mixed solution. 100g of the spherical particles were added to a reaction vessel, followed by 300g of the mixed solution. The mixture was heated to 70℃ and reacted for 6 hours. The product was then washed with acetone (detergent 2) and then washed with water to remove the acetone, yielding the spherical adsorbent. Adsorbent particles with a size of 0.6-2.0mm were sieved and used as the product for testing.

[0071] The electron micrograph of the lithium adsorbent prepared in this embodiment is shown in the figure. Figure 1 .

[0072] The brine was subjected to column adsorption experiments, and the brine composition is shown in Table 1.

[0073] Table 1 Brine Components

[0074]

[0075] The brine was heated for adsorption at a rate of 3 BV / h, with an adsorption capacity of 8 BV. The average lithium loading of the resin during the first five adsorption cycles was 2.31 g / L. Subsequently, the resin underwent a 300-cycle brine-water shock test using a permeation testing device, with the brine at 80°C and the water at 40°C. After the test, the adsorbent mass loss was 0.14%. A subsequent five-cycle test under the same conditions showed an average lithium loading of 2.27 g / L.

[0076] Example 2

[0077] Based on the lithium adsorbent preparation method provided in Example 1, five experimental groups were set up to prepare lithium adsorbents. Experimental group 1 was the same as in Example 1, and groups 2-4 were largely the same as in Example 1, with differences shown in Table 2. After preparing the lithium adsorbent, brine was used for column adsorption experiments. The brine composition was as shown in Table 1. The brine was heated for adsorption, with an adsorption rate of 3 BV / h and an adsorption capacity of 8 BV. The average lithium loading of the resin in the first 5 adsorption cycles was 2.01 g / L. Subsequently, the resin was subjected to a 300-cycle brine-water shock test using a resin lifetime testing device, with the brine at 80°C and the water at 40°C. The results are shown in Table 2.

[0078] Table 2 Experimental Groups

[0079]

[0080]

[0081] Group 3 did not undergo gradient stirring. Its step (3) is as follows: pour the oil phase liquid into the water phase, adjust the stirring speed to quickly disperse it into spherical shape; heat up to 60℃ and start stirring at a stirring speed of 180 rpm. After reacting for 8 hours, heat up to 80℃ and react at a stirring speed of 180 rpm for 2 hours. After the heat preservation is completed, filter out the spherical particles.

[0082] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing a lithium adsorbent, characterized in that, It includes: The oil phase and the aqueous phase are mixed to obtain a lithium adsorbent intermediate; The lithium adsorbent intermediate is mixed with an organic additive to obtain a lithium adsorbent. The oil phase comprises a lithium source, an aluminum source, an initiator, an oil phase matrix, and an oil phase additive; the oil phase matrix comprises a polymer and vinylidene fluoride; the lithium source comprises at least one of lithium hydroxide or lithium oxide; and the aqueous phase comprises water and a dispersant. The mixing steps of the oil phase and the aqueous phase include: gradient stirring of the mixture of the oil phase and the aqueous phase; the gradient stirring steps include: stirring at an initial stirring speed of 30-190 rpm, pausing for a second set time after each first set stirring time; after each pause, reducing the stirring speed to a set speed 1 and continuing stirring until the stirring speed is ≤ a set speed 2, where the set speed 2 is 10-30 rpm, and maintaining the set speed 2 at 40-120°C for stirring for 20-600 min.

2. The preparation method according to claim 1, characterized in that, The first set time is 20~120 minutes.

3. The preparation method according to claim 1, characterized in that, The second set time is 20min~120min.

4. The preparation method according to claim 1, characterized in that, The set rotational speed 1 is 10~30 rpm.

5. The preparation method according to claim 1, characterized in that, Maintain the stirring temperature at 40~80℃ before setting the rotation speed 2.

6. The preparation method according to claim 1, characterized in that, In the oil phase matrix, the mass ratio of the polymer to the vinylidene fluoride is 5:1 to 10.

7. The preparation method according to claim 1, characterized in that, The polymer includes any one or more of the following: polyacrylamide, polyacrylic acid, polyacrylate, polyurethane, polyester, polyether, polystyrene, polyenol, phenolic resin, and epoxy resin.

8. The preparation method according to claim 1, characterized in that, In the oil phase, the total mass ratio of the lithium source and the aluminum source to the oil phase additive is 3 to 18:

10.

9. The preparation method according to claim 1, characterized in that, The oil phase additives include: N-methylpyrrolidone and organic solvents.

10. The preparation method according to claim 9, characterized in that, The mass ratio of the N-methylpyrrolidone to the organic solvent is 1 to 5:

1.

11. The preparation method according to claim 9, characterized in that, The organic solvents in the oil phase additive include any one or more of methanol, ethanol, acetone, gasoline, DMF, ethyl acetate, dichloromethane, chloroform, benzene, toluene, isopropanol, and diethyl ether.

12. The preparation method according to any one of claims 1 to 11, characterized in that, The mixing volume ratio of the oil phase and the water phase is 1:1 to 3.

13. The preparation method according to any one of claims 1 to 11, characterized in that, The molar ratio of the lithium source to the aluminum source is 5:1 to 10.

14. The preparation method according to any one of claims 1 to 11, characterized in that, The aluminum source includes aluminum salts.

15. The preparation method according to claim 14, characterized in that, The aluminum source includes any one or more of aluminum chloride, aluminum nitrate, aluminum carbonate, aluminum sulfate, aluminum acetate, and aluminum oxide.

16. The preparation method according to any one of claims 1 to 11, characterized in that, The oil phase also includes a pore-forming agent.

17. The preparation method according to claim 16, characterized in that, The pore-forming agent includes any one or more of white oil, liquid wax, gasoline, and n-octane.

18. The preparation method according to any one of claims 1 to 11, characterized in that, The dispersant has a mass-volume fraction of 0.1% to 2% in the aqueous phase.

19. The preparation method according to any one of claims 1 to 11, characterized in that, The dispersant includes any one or more of carboxymethyl cellulose and hydroxyethyl cellulose.

20. The preparation method according to any one of claims 1 to 11, characterized in that, Before mixing the obtained lithium adsorbent intermediate with the organic additive after mixing the oil phase and the aqueous phase, the preparation method further includes: washing the product after mixing the oil phase and the aqueous phase with detergent 1 to remove the pore-forming agent.

21. The preparation method according to claim 20, characterized in that, The detergent 1 includes any one or more of methanol, ethanol, acetone, gasoline, DMF, ethyl acetate, dichloromethane, chloroform, benzene, toluene, isopropanol, and diethyl ether.

22. The preparation method according to any one of claims 1 to 11, characterized in that, The organic additives include any one or more of the following: polyvinyl alcohol, polylactic acid, cellulose acetate, ethyl cellulose, polyvinyl chloride, polycarbonate, ethylene alcohol-ethylene cellulose copolymer, and ethylene-propylene polymer.

23. The preparation method according to any one of claims 1 to 11, characterized in that, The mass ratio of the lithium adsorbent intermediate to the organic auxiliary agent is 20:1 to 8.

24. The preparation method according to any one of claims 1 to 11, characterized in that, The mixing conditions for the lithium adsorbent intermediate and the organic additive include: a temperature of 30–80°C and a time of 1–6 h.

25. The preparation method according to any one of claims 1 to 11, characterized in that, The preparation method further includes adding a polar organic solvent to the mixture during the mixing process of the lithium adsorbent intermediate and the organic additive.

26. The preparation method according to claim 25, characterized in that, The polar organic solvent includes any one or more of ethanol, DMF, acetonitrile, and isopropanol.

27. The preparation method according to any one of claims 1 to 11, characterized in that, The preparation method further includes washing the product after mixing the lithium adsorbent intermediate with the organic additive using detergent 2.

28. The preparation method according to claim 27, characterized in that, The detergent 2 includes water and / or organic solvents.

29. The preparation method according to claim 28, characterized in that, The organic solvent in the detergent 2 includes any one or more of the following: methanol, ethanol, acetone, gasoline, DMF, ethyl acetate, dichloromethane, chloroform, benzene, toluene, isopropanol, N-methylpyrrolidone, and diethyl ether.

30. The preparation method according to claim 27, characterized in that, After washing with the detergent 2, the preparation method further includes drying the product washed with the detergent 2 to obtain the lithium adsorbent.

31. A lithium adsorbent, characterized in that, It includes: The lithium adsorbent prepared by the preparation method according to any one of claims 1 to 30.

32. The use of the lithium adsorbent as described in claim 31 in lithium extraction or in the preparation of products for lithium extraction.

33. The application according to claim 32, characterized in that, The lithium extraction includes lithium extraction under high temperature conditions.

34. The application according to claim 32, characterized in that, The lithium extraction includes extracting lithium from high-temperature brine.

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