Rare earth selective adsorption material, preparation method and application thereof

Abstract

The application provides a preparation method of a rare earth selective adsorption material, and the method comprises the following steps: mixing activated carbon and a silane coupling agent in a medium, and adjusting the pH for the first time to obtain an intermediate product; mixing the obtained intermediate product with 2-chloromethyl pyridine hydrochloride, and adjusting the pH for the second time to obtain the rare earth selective adsorption material. The preparation method of the rare earth selective adsorption material is simple, the raw materials are mature chemical products, and the method is easy to realize large-scale production. The prepared rare earth selective adsorption material can selectively adsorb rare earth elements, the pH of the adsorption environment is consistent with the actual low-concentration rare earth element wastewater, the concentration of the adsorbed rare earth elements is as low as 10 mg / L, the adsorption effect is excellent in a high-salt environment with a concentration of 5 g / L, the adsorption and desorption can be recycled, and the method is economical and practical.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of element recovery, and relates to an adsorption material, in particular to a rare earth selective adsorption material and a preparation method and application thereof. BACKGROUND

[0002] Rare earth is called the vitamin of industry, and plays a vital role in smelting, chemical industry, high-tech industry and military industry. A large amount of high-salt wastewater containing low-concentration rare earth elements is usually generated in the process of rare earth mineral development, rare earth material processing and recovery. The wastewater often contains a large amount of salt, mainly chlorides. Since rare earth elements have high economic value, if the low-concentration rare earth in the wastewater is not recovered, not only resources will be wasted, but also environmental pollution will be caused. At present, the methods for recovering rare earth elements mainly include solvent extraction, liquid membrane separation, ion exchange and reverse osmosis. These methods are suitable for recovering high-concentration rare earth metal ions under conditions with less salt interference, and have the disadvantages of high cost and low efficiency.

[0003] CN104294063A discloses a method for recovering rare earth from low-concentration rare earth solution. The method uses acidic phosphorus extractants with PKa values greater than 4 and less than 3.5 for multiple extractions in sequence to obtain a high-concentration chlorinated rare earth solution. The method can effectively enrich low-concentration rare earth elements, but the process steps are complicated and multiple types of organic reagents are used.

[0004] CN105861831A discloses a method for recovering rare earth from rare earth salt solution by precipitation. The method uses a calcium-magnesium alkaline compound to mix with an ammonium-containing solution for a precipitation reaction, precipitates the rare earth elements, and then performs solid-liquid separation to obtain a rare earth precipitate. The method uses a chemical reaction to precipitate and enrich rare earth elements, which inevitably introduces chemicals and generates a precipitate waste liquid.

[0005] Activated carbon is an inorganic adsorption material with a large specific surface area, multiple types of surface functional groups and low cost. The adsorption of metals by activated carbon is mainly physical adsorption, which has the advantages of simple process, no introduction of chemicals and no waste generation.

[0006] CN111203182A discloses a modified activated carbon for adsorbing phenol and a preparation method and application thereof. The method modifies the activated carbon by sequentially using an oxidizing agent for oxidation and microwave irradiation, and the obtained modified activated carbon can adsorb phenol in cigarette smoke.

[0007] CN102513061A discloses a modified activated carbon and a preparation method and application thereof. The method performs oxidation, ammoniation and methylation treatment on the surface of the activated carbon to obtain the modified activated carbon, which can be used for adsorbing perchlorate in drinking water.

[0008] In the prior art, there is little research on the process method for selective adsorption of rare earth elements. In addition, in a high-salt solution system, the adsorption effect of conventional adsorption materials on low-concentration elements in high-salt wastewater is significantly reduced due to the influence of coexisting ions.

[0009] Therefore, in view of the deficiencies in the prior art, it is necessary to provide a rare earth selective adsorption material and a preparation method and application thereof. SUMMARY

[0010] The purpose of the present application is to provide a rare earth selective adsorption material and a preparation method and application thereof, which can effectively selectively adsorb low-concentration rare earth elements in a high-salt solution, and the adsorption material can be reused.

[0011] To achieve the purpose of the present application, the following technical solutions are adopted:

[0012] In a first aspect, the present application provides a preparation method of a rare earth selective adsorption material, which comprises the following steps:

[0013] (1) mixing activated carbon and a silane coupling agent in a medium and adjusting the pH for the first time to obtain an intermediate product;

[0014] (2) mixing the intermediate product obtained in step (1) with 2-chloromethylpyridine hydrochloride and adjusting the pH for the second time to obtain a rare earth selective adsorption material.

[0015] The preparation method provided by the present application uses activated carbon as a substrate, utilizes the amino group of the silane coupling agent as a grafting site for 2-methylpyridine hydrochloride, grafts a pyridine group on the surface of the activated carbon, utilizes the pyridine group to coordinate and complex rare earth ions, and realizes high-selective adsorption of rare earth elements. The preparation process is simple, mature chemical products are used as raw materials, and scale production can be easily realized. The prepared adsorption material has good stability and adsorption performance, can selectively adsorb rare earth elements in a solution, realizes recovery of rare earth elements, can be reused, and has low cost.

[0016] Preferably, the volume ratio of the activated carbon to the medium in step (1) is (0.05-1):1, which can be 0.05:1, 0.1:1, 0.3:1, 0.5:1, 0.8:1 or 1:1, but is not limited to the listed values, and other values not listed in the value range are also applicable.

[0017] Preferably, the medium in step (1) comprises deionized water and ethanol.

[0018] Preferably, the volume ratio of the ethanol to deionized water is (1-9):1, for example, it can be 1:1, 1:3, 1:5, 1:7 or 1:9, but is not limited to the listed values, and other values not listed in the value range are also applicable.

[0019] Preferably, the first pH adjustment in step (1) is 3-6, for example, it can be 3, 4, 5 or 6, but is not limited to the listed values, and other values not listed in the value range are also applicable.

[0020] Preferably, the amount of silane coupling agent used in step (1) is 0.5-15% of the volume of the medium, for example, it can be 0.5%, 3%, 5%, 8%, 10%, 12% or 15%, but is not limited to the listed values, and other values not listed in the value range are also applicable.

[0021] Preferably, the temperature of the first mixing in step (1) is 25-80°C, for example, it can be 25°C, 40°C, 50°C, 65°C or 80°C, but is not limited to the listed values, and other values not listed in the value range are also applicable.

[0022] Preferably, the time of the first mixing in step (1) is 1-14h, for example, it can be 1h, 5h, 7h, 10h, 12h or 14h, but is not limited to the listed values, and other values not listed in the value range are also applicable.

[0023] Preferably, the mass ratio of the intermediate product to 2-chloromethylpyridine hydrochloride in step (2) is (0.4-2):1, for example, it can be 0.4:1, 0.5:1, 1:1, 1.5:1 or 2:1, but is not limited to the listed values, and other values not listed in the value range are also applicable.

[0024] Preferably, the second pH adjustment in step (2) is 5-8, for example, it can be 5, 6, 7 or 8, but is not limited to the listed values, and other values not listed in the value range are also applicable.

[0025] Preferably, the reagent for the second pH adjustment in step (2) includes sodium carbonate.

[0026] Preferably, the medium for the mixing in step (2) includes ethanol and / or deionized water.

[0027] Preferably, the temperature of the second mixing in step (2) is 45-79°C, for example, it can be 45°C, 50°C, 60°C, 70°C or 79°C, but is not limited to the listed values, and other values not listed in the value range are also applicable.

[0028] Preferably, the second mixing in step (2) is performed for 3-10 hours, for example, 3 hours, 5 hours, 7 hours, 9 hours or 10 hours, but not limited to the listed values, other values not listed in the range of values are also applicable.

[0029] Preferably, the first dispersion is performed before the first mixing in step (1).

[0030] Preferably, the method of the first dispersion comprises ultrasonic.

[0031] Preferably, the first dispersion is performed for 1-20 minutes, for example, 1 minute, 5 minutes, 10 minutes, 15 minutes or 20 minutes, but not limited to the listed values, other values not listed in the range of values are also applicable.

[0032] Preferably, the first washing and the first drying are performed in sequence after the first mixing in step (1).

[0033] Preferably, the first drying is performed at a temperature of 25-60℃, for example, 25℃, 30℃, 40℃, 50℃ or 60℃, but not limited to the listed values, other values not listed in the range of values are also applicable.

[0034] Preferably, the first drying is performed for 3-12 hours, for example, 3 hours, 5 hours, 8 hours, 10 hours or 12 hours, but not limited to the listed values, other values not listed in the range of values are also applicable.

[0035] Preferably, the second dispersion is performed before the second mixing in step (2).

[0036] Preferably, the method of the second dispersion comprises ultrasonic.

[0037] Preferably, the second washing and the second drying are performed in sequence after the second mixing in step (2).

[0038] Preferably, the second drying is performed at a temperature of 35-60℃, for example, 35℃, 40℃, 45℃, 50℃, 55℃ or 60℃, but not limited to the listed values, other values not listed in the range of values are also applicable.

[0039] Preferably, the second drying is performed for 6-12 hours, for example, 6 hours, 7 hours, 8 hours, 9 hours, 10 hours, 11 hours or 12 hours, but not limited to the listed values, other values not listed in the range of values are also applicable.

[0040] In a second aspect, the present application provides a rare earth selective adsorption material, which is prepared by the preparation method of the first aspect.

[0041] In a third aspect, the present application provides a use of the rare earth selective adsorption material according to the second aspect, wherein the rare earth selective adsorption material is used for adsorbing rare earth elements.

[0042] Compared with the prior art, the present application has the following beneficial effects:

[0043] The preparation method of the rare earth selective adsorption material provided by the present application has a simple preparation process, and the raw materials used are mature chemical products, which are easy to realize large-scale production. The prepared rare earth selective adsorption material can selectively adsorb rare earth elements, and the pH of the adsorption environment used is consistent with the actual low-concentration rare earth element wastewater. The concentration of the adsorbed rare earth elements can be as low as 10 mg / L. The rare earth selective adsorption material can maintain excellent adsorption effect in a high-salt environment of 5 g / L, and can realize the cyclic use of adsorption and desorption, and has good economic practicability. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 is a scanning electron microscope image of the activated carbon in Example 1.

[0045] Figure 2 is a scanning electron microscope image of the intermediate product obtained in step (1) in Example 1.

[0046] Figure 3 is a scanning electron microscope image of the rare earth selective adsorption material prepared in Example 1.

[0047] Figure 4 is a nitrogen adsorption-desorption curve diagram of the activated carbon, the intermediate product and the rare earth selective adsorption material in Example 1.

[0048] wherein, AC is activated carbon; AC-NH is the intermediate product; and AC-NH-PY is the rare earth selective adsorption material.

[0049] Figure 5 is a BJH pore size distribution curve diagram of the activated carbon, the intermediate product and the rare earth selective adsorption material in Example 1.

[0050] wherein, AC is activated carbon; AC-NH is the intermediate product; and AC-NH-PY is the rare earth selective adsorption material.

[0051] Figure 6 is a concentration diagram of the rare earth elements adsorbed by the activated carbon and the rare earth selective adsorption material in Example 1.

[0052] wherein, C0 is the original concentration of the element; AC is activated carbon; and AC-NH-PY is the rare earth selective adsorption material. DETAILED DESCRIPTION

[0053] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0054] To clearly illustrate the technical solution of the present invention, the rare earth selective adsorption material prepared in the embodiments of the present invention was tested for its rare earth element adsorption effect: the rare earth selective adsorption material prepared in the embodiments was added to a rare earth mixed solution at a concentration of 1 g / L for adsorption. The pH of the rare earth mixed solution was 5, and it contained 10 mg / L of Dy, La and Yb elements respectively. After adsorption for 10 h, the change in the rare earth element content in the rare earth mixed solution before and after adsorption was measured, and the adsorption rate was calculated.

[0055] Example 1

[0056] This embodiment provides a method for preparing a rare earth selective adsorption material, the method comprising the following steps:

[0057] (1) Using a mixture of ethanol and deionized water in a volume ratio of 3:1 as a medium, activated carbon was added, with a volume ratio of activated carbon to medium of 0.5:1. After ultrasonic dispersion for 10 min, silane coupling agent was added, and the pH was adjusted to 3.5 with HCl. After standing for 1 h, the pH did not change. The mixture was added to a 500 mL three-necked flask and reacted at 70 °C for 6 h. After the reaction was completed, the reaction medium was removed by vacuum filtration. The mixture was repeatedly washed with deionized water and ethanol until no precipitate was formed when the washed liquid was added to silver sulfate solution. The washed intermediate product was placed in a vacuum drying oven and dried at 40 °C for 12 h to obtain the intermediate product.

[0058] (2) The intermediate product obtained in step (1) was ultrasonically dispersed in ethanol and the pH was adjusted to 7 with Na2CO3. 2-Chloromethylpyridine hydrochloride was added at a mass ratio of 1:1 between the intermediate product and 2-chloromethylpyridine hydrochloride. The mixture was placed in a 500 mL three-necked flask and reacted at 79 °C for 6 h. After the reaction was completed, the reaction medium was removed by vacuum filtration. The mixture was repeatedly washed with deionized water and ethanol until no precipitate was formed when the washed liquid was added dropwise to silver sulfate solution. Then it was placed in a vacuum drying oven and dried at 40 °C for 12 h to obtain rare earth selective adsorption material.

[0059] In this embodiment, the scanning electron microscope (SEM) images of activated carbon (denoted as AC), activated carbon grafted with the intermediate product silane coupling agent obtained in step (1) (denoted as AC-NH), and the obtained rare earth selective adsorption material (denoted as AC-NH-PY) are shown below. Figure 1 , Figure 2 , Figure 3 As shown, there are no indistinguishable changes on the surfaces of the three materials; the nitrogen adsorption-desorption curves are as follows. Figure 4 As shown in the figure, the BJH aperture distribution curve is as follows:Figure 5 As shown in Table 1, the pore size data, it can be seen that the specific surface area, pore size of the three materials change little, the material stability is good, the synthesis process has little effect on the physical properties of the material; the N content change is shown in Table 2, and the rare earth element adsorption results are shown in Table 3. Figure 6 As shown in Table 1, the pore size data, it can be seen that the specific surface area, pore size of the three materials change little, the material stability is good, the synthesis process has little effect on the physical properties of the material; the N content change is shown in Table 2, and the rare earth element adsorption results are shown in Table 3.

[0060] The rare earth element adsorption results of the rare earth selective adsorption material prepared in this example are listed in Table 3.

[0061] Example 2

[0062] The preparation method of the rare earth selective adsorption material provided in this example comprises the following steps:

[0063] (1) The volume ratio of ethanol and deionized water is 1:1, and the volume ratio of activated carbon and medium is 0.05:1. After ultrasonic dispersion for 1 min, silane coupling agent is added, and HCl is used to adjust the pH to 6. After standing for 1 h, the pH has no change. Add 500 mL three-necked flask in the condition of 25℃ and react for 14 h. After the reaction is completed, the reaction medium is removed by suction filtration, and the cleaned intermediate product is placed in a vacuum drying oven at 25℃ and dried for 8 h to obtain the intermediate product.

[0064] (2) The intermediate product obtained in step (1) is ultrasonically dispersed in ethanol and the pH is adjusted to 5 using Na2CO3. According to the mass ratio of intermediate product to 2-chloromethylpyridine hydrochloride of 0.4:1, 2-chloromethylpyridine hydrochloride is added, and placed in a 500 mL three-necked flask and reacted at 60℃ for 3 h. After the reaction is completed, the reaction medium is removed by suction filtration, and the cleaned intermediate product is placed in a vacuum drying oven at 35℃ and dried for 8 h to obtain the rare earth selective adsorption material.

[0065] The rare earth element adsorption results of the rare earth selective adsorption material prepared in this example are listed in Table 3.

[0066] Example 3

[0067] The preparation method of the rare earth selective adsorption material provided in this example comprises the following steps:

[0068] (1) The ethanol and deionized water were mixed in a volume ratio of 9:1 as a medium, activated carbon was added, the volume ratio of activated carbon to medium was 1:1, and after ultrasonic dispersion for 20 min, silane coupling agent was added, HCl was used to adjust the pH to 3, and after standing for 1 h, the pH had no change, 500 mL of three-necked flask was added, and the reaction was carried out at 80°C for 1 h, after the reaction was completed, the reaction medium was removed by suction filtration, and deionized water and ethanol were repeatedly washed until no precipitate was generated when the washed liquid was added dropwise into silver sulfate solution, and then it was placed in a vacuum drying box and dried at 60°C for 3 h to obtain an intermediate product;

[0069] (2) The intermediate product obtained in step (1) was ultrasonically dispersed in ethanol and adjusted to pH 5 using Na2CO3, 2-chloromethylpyridine hydrochloride was added according to a mass ratio of intermediate product to 2-chloromethylpyridine hydrochloride of 2:1, placed in a 500 mL three-necked flask, and reacted at 45°C for 10 h, after the reaction was completed, the reaction medium was removed by suction filtration, and deionized water and ethanol were repeatedly washed until no precipitate was generated when the washed liquid was added dropwise into silver sulfate solution, and then it was placed in a vacuum drying box and dried at 60°C for 6 h to obtain a rare earth selective adsorption material.

[0070] The rare earth element adsorption results of the rare earth selective adsorption material prepared in this example are listed in Table 3.

[0071] Example 4

[0072] This example provides a preparation method of a rare earth selective adsorption material, compared with example 1, in step (1), the volume ratio of ethanol to deionized water is 19:1, and the rest is the same as example 1.

[0073] The rare earth element adsorption results of the rare earth selective adsorption material prepared in this example are listed in Table 3.

[0074] Example 5

[0075] This example provides a preparation method of a rare earth selective adsorption material, compared with example 1, in step (1), the volume ratio of ethanol to deionized water is 0.5:1, and the rest is the same as example 1.

[0076] The rare earth element adsorption results of the rare earth selective adsorption material prepared in this example are listed in Table 3.

[0077] Example 6

[0078] This example provides a preparation method of a rare earth selective adsorption material, compared with example 1, in step (1), the pH is adjusted to 2, and the rest is the same as example 1.

[0079] The rare earth element adsorption results of the rare earth selective adsorption material prepared in this example are listed in Table 3.

[0080] Example 7

[0081] The present example provides a preparation method of a rare earth selective adsorption material. Compared with Example 1, in step (1), the pH is adjusted to 7, and the rest are the same as Example 1.

[0082] The rare earth element adsorption results of the rare earth selective adsorption material prepared in the present example are listed in Table 3.

[0083] Example 8

[0084] The present example provides a preparation method of a rare earth selective adsorption material. Compared with Example 1, in step (2), the medium in the reaction is replaced by deionized water, and the rest are the same as Example 1.

[0085] The rare earth element adsorption results of the rare earth selective adsorption material prepared in the present example are listed in Table 3.

[0086] Example 9

[0087] The present example provides a preparation method of a rare earth selective adsorption material. Compared with Example 1, in step (2), the mass ratio of the intermediate product to 2-chloromethylpyridine hydrochloride is controlled to be 0.1:1, and the rest are the same as Example 1.

[0088] The rare earth element adsorption results of the rare earth selective adsorption material prepared in the present example are listed in Table 3.

[0089] Example 10

[0090] The present example provides a preparation method of a rare earth selective adsorption material. Compared with Example 1, in step (2), the mass ratio of the intermediate product to 2-chloromethylpyridine hydrochloride is controlled to be 2.5:1, and the rest are the same as Example 1.

[0091] The rare earth element adsorption results of the rare earth selective adsorption material prepared in the present example are listed in Table 3.

[0092] Example 11

[0093] The present example provides a preparation method of a rare earth selective adsorption material. Compared with Example 1, in step (2), the pH is adjusted to 4, and the rest are the same as Example 1.

[0094] The rare earth element adsorption results of the rare earth selective adsorption material prepared in the present example are listed in Table 3.

[0095] Example 12

[0096] The embodiment provides a preparation method of a rare earth selective adsorption material, wherein in step (2), the pH is adjusted to 9, and the rest is the same as in the embodiment 1.

[0097] The rare earth element adsorption results of the rare earth selective adsorption material prepared in the embodiment are shown in Table 3.

[0098] Embodiment 13

[0099] The embodiment provides a preparation method of a rare earth selective adsorption material, and the rare earth selective adsorption material prepared in the embodiment is the same as in the embodiment 1.

[0100] NaCl is added into the rare earth mixed solution to reach a concentration of 0.1 g / L, the rare earth selective adsorption material prepared in the embodiment is used to adsorb the solution, and the obtained rare earth element adsorption results are shown in Table 3.

[0101] Embodiment 14

[0102] The embodiment provides a preparation method of a rare earth selective adsorption material, and the rare earth selective adsorption material prepared in the embodiment is the same as in the embodiment 1.

[0103] NaCl is added into the rare earth mixed solution to reach a concentration of 5 g / L, the rare earth selective adsorption material prepared in the embodiment is used to adsorb the solution, and the obtained rare earth element adsorption results are shown in Table 3.

[0104] Embodiment 15

[0105] The embodiment provides a preparation method of a rare earth selective adsorption material, and the rare earth selective adsorption material prepared in the embodiment is the same as in the embodiment 1.

[0106] CaCl2 is added into the rare earth mixed solution to reach a concentration of 0.1 g / L, the rare earth selective adsorption material prepared in the embodiment is used to adsorb the solution, and the obtained rare earth element adsorption results are shown in Table 3.

[0107] Embodiment 16

[0108] The embodiment provides a preparation method of a rare earth selective adsorption material, and the rare earth selective adsorption material prepared in the embodiment is the same as in the embodiment 1.

[0109] CaCl2 is added into the rare earth mixed solution to reach a concentration of 5 g / L, the rare earth selective adsorption material prepared in the embodiment is used to adsorb the solution, and the obtained rare earth element adsorption results are shown in Table 3.

[0110] Table 1

[0111] BET specific surface area (m 2 / g) Pore volume (ml / g) 3 / g) Average pore size (nm) AC 989.1345 1.069712 4.3259 AC-NH 896.909 0.987416 4.4036 AC-NH-PY 828.1826 0.940891 4.5444

[0112] Table 2

[0113] N content (%) AC 1.055 AC-NH 1.635 AC-NH-PY 1.77

[0114] Table 3

[0115]

[0116]

[0117] As can be seen from Table 3:

[0118] The rare earth selective adsorption material prepared by the preparation method has good selective adsorption effect on rare earth elements, and the adsorption rate of Dy, La and Yb elements can reach 71.19%, 37.66% and 75.5% respectively when the adsorption material is prepared by the preferred process condition of the application. Compared with Example 1, in Examples 4-12, the adsorption material is prepared by using process parameters beyond the preferred process parameters of the application, which affects the grafting of the group on the surface of the activated carbon, so the selective adsorption effect is decreased.

[0119] In Examples 13-16, the rare earth selective adsorption material prepared in Example 1 is applied to the solution containing sodium salt or calcium salt for adsorption, and the adsorption effect of the material is not affected, and CaCl2 has a certain promoting effect on adsorption, so it can be seen that the adsorption effect of the adsorption material in the high salt environment is good.

[0120] In summary, the preparation method of the rare earth selective adsorption material provided by the application has simple preparation process, the raw materials used are mature chemical products, and the scale production can be easily realized; the rare earth selective adsorption material prepared can selectively adsorb rare earth elements, the pH of the adsorption environment used is consistent with the actual low-concentration rare earth element wastewater, the concentration of the rare earth elements that can be adsorbed is as low as 10 mg / L, the adsorption effect is good in a high salt environment of 5 g / L, and the cyclic use of adsorption and desorption can be realized, which is economical and practical.

[0121] The applicant declares that the above description is only a specific embodiment of the application, but the protection scope of the application is not limited thereto. It should be understood by those skilled in the art that any changes or replacements within the technical scope disclosed by the application can be easily thought of by those skilled in the art, and all fall within the protection scope and disclosure scope of the application.

Claims

1. A method for producing a rare earth selective adsorbent material, characterized by comprising the steps of: The preparation method comprises the following steps: ​ (1) first mixing and first adjusting pH of the activated carbon and silane coupling agent in a medium, wherein the medium comprises ethanol and deionized water, the volume ratio of the ethanol to the deionized water is (1-9):1, the pH of the first adjusting is 3-6, and an intermediate product is obtained; (2) second mixing and second adjusting pH of the intermediate product obtained in step (1) and 2-chloromethylpyridine hydrochloride, wherein the mass ratio of the intermediate product to the 2-chloromethylpyridine hydrochloride is (0.4-2):1, the medium of the second mixing is ethanol, the pH of the second adjusting is 5-8, and a rare earth selective adsorption material is obtained.

2. The production method according to claim 1, characterized by, In step (1), the volume ratio of the activated carbon to the medium is (0.05-1):

1.

3. The preparation method according to claim 1, characterized in that, In step (1), the amount of the silane coupling agent is 0.5-15% of the volume of the medium.

4. The production method according to claim 1, characterized by, In step (1), the temperature of the first mixing is 25-80℃.

5. The preparation method according to claim 1, characterized in that, In step (1), the time of the first mixing is 1-14h.

6. The method of claim 1, wherein, In step (2), the reagent of the second adjusting pH comprises sodium carbonate.

7. The preparation method according to claim 1, characterized in that, In step (2), the temperature of the second mixing is 45-79℃.

8. The method of claim 1, wherein, In step (2), the time of the second mixing is 3-10h.

9. The method of claim 1, wherein, In step (1), first dispersing is performed before the first mixing.

10. The method of claim 9, wherein, The method of the first dispersing comprises ultrasonic.

11. The preparation method according to claim 9, characterized in that, The time of the first dispersing is 1-20min.

12. The method of claim 1, wherein, In step (1), first washing and first drying are sequentially performed after the first mixing.

13. The method of claim 12, wherein, The temperature of the first drying is 25-60℃.

14. The method of claim 12, wherein, The time of the first drying is 3-12h.

15. The method of claim 1, wherein, In step (2), second dispersing is performed before the second mixing.

16. The method of claim 15, wherein, The method of the second dispersing comprises ultrasonic.

17. The method of claim 1, wherein, In step (2), second washing and second drying are sequentially performed after the second mixing.

18. The method of claim 17, wherein, The temperature of the second drying is 35-60℃.

19. The method of claim 17, wherein, The time of the second drying is 6-12h.

20. A rare earth selective adsorbent material, characterized by, The rare earth selective adsorption material is prepared by the preparation method in any one of claims 1-19.

21. Use of the rare earth selective adsorbent material of claim 20, wherein, The rare earth selective adsorption material is used for adsorbing rare earth elements.

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