Titanium-based lithium adsorbent with fast adsorption as well as preparation method and application of titanium-based lithium adsorbent

Abstract

The invention provides a titanium-based lithium adsorbent with fast adsorption and a preparation method and application thereof, and belongs to the technical field of salt lake lithium extraction. The titanium-based lithium adsorbent is obtained by pickling, washing and drying a lithium titanate material Li4Ti5O12, the single crystal structure of the titanium-based lithium adsorbent has an internal communicated aperture and a short ion diffusion length, Li < + > can permeate into the single crystal in the adsorption process, and in strong acid and strong alkali environments, the structure is stable after multiple adsorption-desorption cycles, and the dissolution loss rate of Ti < 4 + > is low; the adsorption rate is high, and the adsorption capacity reaches 97% within 20 min; in a multi-element system, the separation effect on Li < + > is good. The device can be repeatedly used in simulated brine, and is green, environment-friendly and excellent in efficiency.

Description

Technical Field

[0001] This invention relates to the field of lithium extraction technology from salt lakes, and in particular to a titanium-based lithium adsorbent with fast adsorption, its preparation method, and its application. Background Technology

[0002] Lithium and its compounds have been widely used in medicine, energy, adhesives, and cement. Especially in recent years, driven by the concept and policies of replacing traditional fuels with green renewable energy in many countries, the scale of batteries for electric vehicles and other electric devices has expanded rapidly. The global lithium consumption market is booming, with global lithium salt consumption reaching approximately 918,000 tons of lithium-ion-coal (LCE) in 2023. The battery industry accounted for over 85% of this, indicating that the supply of lithium from conventional mineral resources is far from sufficient. Salt lakes, on the other hand, possess abundant lithium reserves, accounting for 69% of the world's total lithium reserves. Therefore, developing efficient, energy-saving, and environmentally friendly lithium extraction technologies from salt lake resources to meet the enormous demand for metallic lithium is urgently needed.

[0003] Currently, the main methods for extracting lithium from salt lakes include evaporation precipitation, solvent extraction, adsorption, membrane technology, and electrochemical methods. Among these methods, adsorption is considered the most promising lithium mining method due to its high efficiency, selectivity, and environmental friendliness. The other technologies face challenges in energy consumption, separation efficiency, environmental pollution, and durability, limiting their industrialization. Titanium-based adsorbents are commonly used, including layered H₂TiO₃ and spinel-structured H₄Ti₅O₃. 12 Two main categories. H4Ti5O 12 Has origin from precursor Li4Ti5O 12 The spinel structure with strong Ti-O bonds enhances lithium adsorption performance and improves recovery capabilities. Current research explores ways to improve the adsorption performance of spinel-structured lithium titanate adsorbents by examining texture and interfacial structure. The academic paper "The Li(H2O)..." further details this. n dehydration behavior influences the Li + ion adsorption on H4Ti5O 12 The study, titled "With Different Facets Exposed" [Chemical Engineering Journal, 2023, 451: 138870], indicates that the adsorbent on different main growth exposed surfaces affects the surface dehydration process and Li. + Adsorption behavior, synthesis of Li4Ti5O4 on the main growth (111) plane 12It exhibits higher adsorption capacity and rate. The academic paper "Highly selective separation of lithium with hierarchical porous lithium-ion sieve microsphere derived from MXene" [Desalination, 2022, 537:115847.] discloses the synthesis of ultrathin nanosheets with high specific surface area to assemble Li4Ti5O. 12 Porous microspheres expose more adsorption sites, achieving a high adsorption capacity of 43.20 mg / g; the academic paper "Preparation of three-dimensional macroporous-mesoporous lithium ion sieve with high Li" + The paper "Adsorption Capacity" [Research on Chemical Intermediates, 2018, 44: 1105-1117.] discloses the synthesis of 3DM-H4Ti5O with a three-dimensional macroporous structure. 12 Li showed superior performance + The adsorption performance (5.51 mmol / g) was higher than that of the non-porous adsorption performance (1.12 mmol / g), which is due to the significantly reduced mass transfer resistance in the highly interconnected porous channels; (See the academic paper "Dual surfactants-assisted adsorption of lithium ions in liquid lithium resources on a superhydrophilic spinel-type H4Ti5O"). 12 The paper "ion sieve" [Separation and Purification Technology, 2024, 330:125479.] discloses the synthesis of a superhydrophilic spinel-type H4Ti5O using a supersurfactant. 12 Ion sieves, with their excellent surface hydrophilicity and open, layered mesoporous structure, enable Li... + and H + Rapid ion exchange between them, Li within 30 min + The adsorption rate exceeds 85%.

[0004] However, current research on titanium-based lithium-ion sieve adsorbents still faces challenges such as low lithium adsorption rate, high titanium dissolution rate, difficulty in material recovery, and actual adsorption capacity being lower than theoretical adsorption capacity. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a titanium-based lithium adsorbent with excellent adsorption performance, good cycle performance, and environmental friendliness. This adsorbent can reach adsorption equilibrium within 20 minutes in a salt lake brine system with multiple competing ions, efficiently capturing Li. + And Ti 4+ It has a low dissolution rate, enabling the extraction of metallic lithium.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: The first objective of this invention is to provide a method for preparing a fast-adsorption titanium-based lithium adsorbent, wherein the titanium-based lithium adsorbent is made from lithium titanate material Li4Ti5O. 12 The lithium titanate material Li4Ti5O was obtained by acid washing, water washing, and drying. 12 The preparation method is as follows: S1. Add tetraisopropyl titanate to deionized water and stir to form a white titanate precipitate; disperse the white titanate precipitate in deionized water, then add LiOH·H2O, stir, then add 30% H2O2, and continue stirring until a pale yellow solution is formed; heat in a water bath. S2. The yellow solution obtained in step S11 is heated in a water bath, and then dried into a white solid product under a drying mechanism. The white solid powder is then calcined in a muffle furnace to obtain Li4Ti5O. 12 ; The dry-burning mechanism involves drying at 120℃-200℃ for 24 hours. The calcination temperature is 450℃-650℃ for annealing for 3-5 hours.

[0007] Furthermore, the volume-to-mass ratio of the tetraisopropyl titanate to the LiOH·H2O is (8~16) mL: (3~7) g.

[0008] Furthermore, the lithium titanate material Li4Ti5O 12 They exhibit a one-dimensional nanorod morphology, with a length of 0.5–2 μm and a diameter of 5–20 μm.

[0009] Furthermore, the acid impregnation process involves impregnating the lithium titanate material Li4Ti5O... 12 Immerse in 0.1~0.25 mg / L HCl for 24h~72h.

[0010] A second objective of this invention is to provide a titanium-based lithium adsorbent with rapid adsorption, which is prepared using the above-described preparation method.

[0011] Furthermore, the crystal form of the titanium-based lithium adsorbent was detected using Cu-Kα radiation. X-ray powder diffraction, expressed in terms of 2θ angle and interplanar spacing, showed characteristic absorption peaks at 18.8°±0.2°, 36.5°±0.2°, and 46.5°±0.2°, corresponding to the (111), (311), and (400) crystal planes, respectively. The relative intensity ratio of the (311) crystal plane to the (400) crystal plane was (0.33~0.43):(0.24:0.36).

[0012] A second objective of this invention is to provide the application of the above-mentioned titanium-based lithium adsorbent in the extraction of lithium ions from salt lake brine.

[0013] Furthermore, the lithium ion concentration in the salt lake brine is 70~500 mg / L. -1 .

[0014] Furthermore, the salt lake brine is a chloride-type precipitated brine.

[0015] A third objective of this invention is to provide a method for extracting lithium ions from salt lake brine, wherein the aforementioned titanium-based lithium adsorbent is added to the salt lake brine at a dosage of 2-3 g / L for treatment, and the pH is adjusted to 9-13. Compared with the prior art, the beneficial effects of the present invention are: (1) The present invention provides a fast-adsorption titanium-based lithium adsorbent, which is made of lithium titanate material Li4Ti5O 12 The titanium-based lithium adsorbent, obtained by acid washing, water washing, and drying, has a single-crystal structure with internally interconnected pores and a short ion diffusion length, which is beneficial for Li... + The adsorption process penetrates into the interior of the single crystal. Under strong acid and strong alkali environments, the structure stabilizes after multiple adsorption-desorption cycles. (Ti) 4+ Low solubility; rapid adsorption rate, reaching 97% adsorption capacity within 20 minutes; in multi-component systems, it is effective for Li... + It has excellent separation effect. It can be reused in simulated brine, is environmentally friendly, and has excellent efficiency. (2) The preparation method of the titanium-based lithium adsorbent provided by the present invention is simple, the raw materials are widely available and low in cost, and can be reused. The reaction process is highly efficient and environmentally friendly. Attached Figure Description

[0016] Figure 1 H4Ti5O is a titanium-based lithium adsorbent. 12 and un-acid-washed Li4Ti5O 12 XRD comparison images; Figure 2a H4Ti5O is a titanium-based lithium adsorbent. 12 SEM image; Figure 2bUn-acid-washed Li4Ti5O 12 SEM image; Figure 3 H4Ti5O is a titanium-based lithium adsorbent. 12 HRTEM image; Figure 4a H4Ti5O is a titanium-based lithium adsorbent. 12 and un-acid-washed Li4Ti5O 12 Comparison of N2 adsorption-desorption isotherms; Figure 4b H4Ti5O is a titanium-based lithium adsorbent. 12 and un-acid-washed Li4Ti5O 12 Pore ​​distribution diagram; Figure 5 A comparison of adsorption rates for lithium systems with different concentrations; Figure 6 H4Ti5O obtained by different acid washing cycles 12 XRD comparison images; Figure 7 A comparison diagram of selectivity in a multi-competitive ion system; Figure 8 This is a comparison diagram of adsorption selectivity in chloride-type brines. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the present invention clearer, embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0018] Example 1 This embodiment provides a method for preparing a titanium-based lithium adsorbent with fast adsorption.

[0019] First, 10 mL of tetraisopropyl titanate was added to 100 mL of deionized water while stirring to form a white titanate precipitate. The product was dispersed in 170 mL of deionized water, and 5.5 g of LiOH·H2O was added while stirring the solution for 30 min. Then, 30 mL of 30% H2O2 was added, and stirring continued until a pale yellow solution was formed. The solution was heated in an 85°C water bath for about 3 h. The product was collected by centrifugation and then dried in an oven at 80°C for 24 h. The white solid product was then dried in the oven by the following steps: drying at 120°C for 6 h, drying at 150°C for 6 h, and drying at 200°C for 12 h. Excess lithium salt in the white product was washed away with deionized water, and the white solid powder was annealed in a muffle furnace at 550°C for 4 h to obtain Li4Ti5O.12 Li4Ti5O 12 The sample was acid-washed in 0.1 M HCl for 24 h, and then centrifuged to separate the acid from the powder. Finally, it was washed several times with deionized water until the solution was neutral, and then dried in an oven at 60 °C for 8 h to obtain the titanium-based adsorbent H4Ti5O. 12 .

[0020] Example 2 10 mL of tetraisopropyl titanate was added to 100 mL of deionized water while stirring to form a white titanate precipitate. 70 mL of deionized water was added to the precipitate, followed by 4.1248 g of LiOH·H₂O, and the solution was stirred for 30 min. Then, 30 mL of 30% H₂O₂ was added dropwise while stirring continuously until a pale yellow solution was formed. The solution was then heated in an 85°C water bath for approximately 3 h to form a milky white liquid. The product was collected by centrifugation and then dried in an oven at 80°C for 24 h. The white solid product was then dried in the oven using the following steps: drying at 130°C for 12 h and then at 180°C for 12 h. Excess lithium salts in the product were washed away with deionized water, and the white solid powder was annealed in a muffle furnace at 450°C for 3 h to obtain Li₄Ti₅O. 12 Li4Ti5O 12 The sample was acid-washed in 0.1 M HCl for 24 h, and then centrifuged to separate the acid from the powder. Finally, it was washed several times with deionized water until the solution was neutral, and then dried in an oven at 60 °C for 8 h to obtain the titanium-based adsorbent H4Ti5O. 12 .

[0021] Example 3 First, add 10 mL of tetraisopropyl titanate to 100 mL of deionized water while stirring to form a white titanate precipitate. Then add 70 mL of deionized water, followed by 6.8747 g of LiOH·H₂O. After stirring continuously for 30 min, add 30 mL of 30% H₂O₂ dropwise while stirring continuously until a clear, pale yellow solution is formed. Heat the solution in an 85°C water bath for approximately 3 h. Collect the product by centrifugation and then dry it in an oven at 80°C for 24 h. Then, dry the white solid product in the oven by the following steps: drying at 150°C for 12 h and then at 200°C for 12 h. Wash away excess lithium salt from the white product with deionized water, and anneal the white solid powder in a muffle furnace at 650°C for 5 h to obtain Li₄Ti₅O. 12 Li4Ti5O 12 The sample was acid-washed in 0.1 M HCl for 24 h, and then centrifuged to separate the acid from the powder. Finally, it was washed several times with deionized water until the solution was neutral, and then dried in an oven at 60 °C for 8 h to obtain the titanium-based adsorbent H4Ti5O.12 .

[0022] refer to Figure 1 Li4Ti5O prepared according to the technical solution of this embodiment 12 and H4Ti5O after pickling 12 X-ray diffraction (XRD) pattern of L4Ti5O; results show L4Ti5O 12 No other impurity peaks appeared, indicating that a pure phase was obtained. After acid washing, H4Ti5O 12 The leftward shift of the peak indicates a change in cell size, resulting in Li... + and H + exchange.

[0023] Referring to Figure 2, a scanning electron microscope (SEM) image of the sample prepared according to the technical solution of this embodiment is shown. It can be seen that the sample exhibits a nanorod morphology with relatively uniform size, ranging from 0.5 to 2 μm. The sample maintains a one-dimensional nanorod morphology before and after acid washing, indicating that H4Ti5O… 12 The sample exhibits a certain degree of stability.

[0024] refer to Figure 3 Figure 1 shows a high-resolution transmission electron microscope (HRTEM) image of the sample prepared according to the technical solution of this embodiment. Figure a) shows that the random absence of octahedral blocks forms a mesoporous structure inside the microrod, and the aggregation of some mesoporous regions forms an interconnected pore structure, which is beneficial for Li… + Entering the adsorption sites inside the crystal reduces mass transfer resistance; in figure b), Li4Ti5O 12 The electron diffraction (SAED) patterns of the two regions selected for the microrod are both single-crystal diffraction patterns, and they are almost identical to each other (a region SAED pattern is shown). These patterns indicate that Li4Ti5O 12 The microrods have a single-crystal structure; as shown in Figure c), the sample exhibits a directionally grown single-crystal structure, and there are obvious channels within the rods, as indicated by the arrows.

[0025] refer to Figure 4a and Figure 4b The figures show the N2 adsorption-desorption isotherms and pore size distribution (BET) curves of the sample prepared in Example 1; the curves can be classified as typical N-type isotherms. Based on the BJH method, Li4Ti5O 12 and H4Ti5O 12 The surface area of ​​BET is 35.51 m². 2 / g and 46.10 m 2 / g. Li4Ti5O 12 and H4Ti5O 12The pore size distribution is mainly concentrated at 11.10 nm and 10.47 nm, which can be attributed to the size of the crystal pores. A large surface area can promote the contact area between the adsorbent and the LiCl solution, and the porosity of the adsorbent may be more favorable for LiCl. + Diffusion from solution to adsorbent.

[0026] To better illustrate the rapid adsorption characteristics of the titanium-based lithium adsorbent provided by this invention, the applicant conducted the following research: 1. Adsorption rate test in lithium-containing solutions of different concentrations Lithium-containing solution concentrations: 100 mg / L, 200 mg / L, and 300 mg / L; the volume of each lithium-containing solution was 100 mL; the pH of the solution was adjusted to 13 with KOH; the dosage of titanium-based lithium adsorbent was 2 g / L; the reaction was carried out at room temperature; and samples were taken at time intervals of 10, 20, 30, 40, 50, 60, 90, 180, and 270 min.

[0027] The results are as follows Figure 5 As shown, Li in the lithium-containing solution can be observed. + Increasing the concentration can significantly improve the adsorbent H4Ti5O 12 Adsorption capacity, c (Li + ) =300 mg L -1 In solution, the adsorption capacity can reach approximately 30 mg g. -1 At all three concentrations, the adsorption capacity reached 97% of the equilibrium value after 20 min of reaction, and the adsorption saturation time was less than 1 h.

[0028] (2) Effect of different acid washing times on adsorption effect Li4Ti5O prepared in Example 1 12 After pickling for 24 hours, it is recorded as the first pickling sample; after pickling for another 24 hours, it is recorded as the second pickling sample; after pickling for another 24 hours, it is recorded as the third pickling sample; after pickling for another 24 hours, it is recorded as the fourth pickling sample; after pickling for another 24 hours, it is recorded as the fifth pickling sample.

[0029] Acid washing conditions: HCl concentration: 0.1 mg / L, HCl volume: 200 mL, Li₄Ti₅O₂ 12 Dosage: 10 g / L. After acid washing, the product is washed with deionized water and centrifuged 6 times until clear and neutral.

[0030] The above samples were subjected to adsorption effect experiments: lithium solution concentration: 200 mg / L, lithium solution volume: 1000 mL, KOH to adjust the solution pH: 13, adsorbent dosage: 2 g / L, reaction time: 4 h.

[0031] The results showed that different pickling times affected Li + The adsorption effects of both were comparable, reaching 97% of the equilibrium capacity within 20 minutes, with adsorption saturation times all less than 1 hour and adsorption capacities ranging from 25 to 27 mg / g. However, different acid washing cycles had varying effects on Ti. 4+ The dissolution rates are different; after one acid wash, Ti... 4+ The dissolution rate was greater than 0.05%, and the Ti was pickled 3-4 times. 4+ The dissolution rate is approximately 0.02%~0.03%, after 5 acid washes, Ti 4+ The dissolution rate is approximately 0.02%, indicating that 3-4 acid washes can provide even lower Ti content. 4+ Dissolution rate, maintaining H4Ti5O 12 The stability of the structure.

[0032] refer to Figure 6 The image shows H4Ti5O obtained after different acid washing cycles. 12 The XRD patterns of the samples all showed the same characteristic crystal planes (111), (311), and (400), with the (111) crystal plane having the highest peak intensity. The H4Ti5O obtained after three acid leaching cycles... 12 The relative intensity ratio between the (311) and (400) crystal planes is 1.19, while the H4Ti5O after 5 acid leachings... 12 The relative intensity ratio between the (311) and (400) crystal planes is 1.15, but the Ti after 5 acid pickling... 4+ The dissolution rate is approximately the same as that of Ti after three acid washes. 4+ The dissolution rate is 3 to 4 times higher, indicating that the relative strength ratio of the (311) and (400) crystal planes has a significant impact on Ti. 4+ The rate of dissolution loss has a significant impact.

[0033] (3) Examine the adsorption cycle performance.

[0034] Lithium solution concentration: 200 mg / L, lithium-containing solution volume: 1000 mL, KOH to adjust solution pH: 13, adsorbent dosage: 2 g / L, reaction time: 4 h; acid washing HCl concentration: 0.1 mg / L, HCl volume: 200 mL, adsorbent dosage after adsorption: 10 g / L, reaction time: 24 h; after acid washing, the product was washed with deionized water and centrifuged 6 times until neutral; reaction was carried out at room temperature. (Powder loss occurred in each adsorption-desorption cycle; adsorption was carried out at a solid-liquid ratio of 2 g / L, and acid washing and desorption were carried out at a solid-liquid ratio of 10 g / L), 5 cycles were performed.

[0035] The results show that the adsorbent provided by this invention has an almost unchanged adsorption capacity after five adsorption-desorption cycles, and Ti 4+The dissolution rate remained at around 0.02%, indicating that the material has good stability and cycle performance.

[0036] (3) Examine the effects of coexistence of multiple competing ions.

[0037] Configure simulated brine solution c (Li + ) =200 mg L -1 c (K + ) =3900 mg L -1 c (Na + ) =700 mg L -1 c (Rb + ) =200 mg L -1 The simulated brine solution volume was 100 mL, the pH of the simulated brine solution was adjusted to 13 with KOH, the adsorbent dosage was 2 g / L, the reaction time was 24 h, and the reaction was carried out at room temperature. After the reaction was completed, the supernatant was filtered and ICP-OES was measured.

[0038] The results are as follows Figure 7 As shown in the figure, it can be seen that for Li + Selectivity compared to K + Na + 、Rb + Better, for Li + The adsorption capacity is 2.85 mmol / L. -1 It is much larger than other competing ions, for K + It hardly adsorbs, presumably due to differences in ionic radius and hydration energy.

[0039] Example 4 In this embodiment, a titanium-based lithium adsorbent is used for adsorption in a chloride-type brine after Mg and Ca have been precipitated.

[0040] The composition of the chloride-precipitated brine is shown in Table 1. 10 mL of brine (pH < 12) was taken, with an adsorbent dosage of 2 g / L, and the reaction time was 24 h at room temperature. Three parallel experiments were conducted. After the reaction, the supernatant was filtered and ICP-OES was measured. Table 1.

[0041] The results are as follows Figure 8 As shown in the figure, it can be seen that for Li + Selectivity compared to K + Na+ Better, for Li + The adsorption capacity is 1.81 mmol / L. -1 The adsorption capacity was slightly lower than that of the simulated solution, which is attributed to the different number of active sites generated at different pH levels, resulting in differences in adsorption capacity. However, it has promising applications in chloride-type brine.

[0042] For any points not covered above, existing technologies shall apply.

[0043] Although specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the invention. Those skilled in the art can make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the direction of the invention or exceeding the scope defined by the appended claims. Those skilled in the art should understand that any modifications, equivalent substitutions, improvements, etc., made to the above embodiments based on the technical essence of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing a fast-adsorption titanium-based lithium adsorbent, characterized in that, The titanium-based lithium adsorbent is composed of lithium titanate material Li4Ti5O. 12 The lithium titanate material Li4Ti5O was obtained by acid washing, water washing, and drying. 12 The preparation method is as follows: S1. Add tetraisopropyl titanate to deionized water and stir to form a white titanate precipitate; disperse the white titanate precipitate in deionized water, then add LiOH·H2O, stir, then add 30% H2O2, and continue stirring until a pale yellow solution is formed. S2. The yellow solution obtained in step S11 is heated in a water bath, and then dried into a white solid product under a drying mechanism. The white solid powder is then calcined in a muffle furnace to obtain Li4Ti5O. 12 ; The dry-burning mechanism involves first drying at 120℃-200℃ for 24 hours; The calcination temperature is 450℃-650℃ for annealing for 3-5 hours.

2. The preparation method according to claim 1, characterized in that, The volume-to-mass ratio of the tetraisopropyl titanate to the LiOH·H2O is (8-16) mL: (3-7) g.

3. The preparation method according to claim 2, characterized in that, The lithium titanate material Li4Ti5O 12 They exhibit a one-dimensional nanorod morphology, with a length of 0.5–2 μm and a diameter of 5–20 μm.

4. The preparation method according to claim 3, characterized in that, The pickling process involves washing lithium titanate material Li4Ti5O 12 Immerse in 0.1~0.25 mg / L HCl for pickling, each pickling lasts 12-24 hours, and the number of pickling cycles is 1~3.

5. A titanium-based lithium adsorbent with rapid adsorption, characterized in that, It is prepared by the preparation method according to any one of claims 1 to 4.

6. The titanium-based lithium adsorbent as described in claim 5, characterized in that, The crystal form of the titanium-based lithium adsorbent was detected using Cu-Kα radiation. X-ray powder diffraction, expressed as 2θ angle and interplanar spacing, showed characteristic absorption peaks at 18.8°±0.2°, 36.5°±0.2° and 46.5°±0.2°, corresponding to the (111) crystal plane, (311) crystal plane and (400) crystal plane, respectively. The relative intensity ratio of the (311) crystal plane to the (400) crystal plane was (0.33~0.43):(0.24:0.36).

7. The application of the titanium-based lithium adsorbent as described in any one of claims 5-6 in the extraction of lithium ions from salt lake brine.

8. The application as described in claim 7, characterized in that, The lithium ion concentration in the brine of the salt lake is 70~500 mg / L. -1 .

9. The application as described in claim 7, characterized in that, The salt lake brine is a chloride-type precipitated brine.

10. A method for extracting lithium ions from salt lake brine, characterized in that, The titanium-based lithium adsorbent as described in any one of claims 5-6 is added to the salt lake brine at a dosage of 2-3 g / L for treatment, and the pH is adjusted to 9-13.

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