Uranium adsorption method

Abstract

The invention discloses a uranium adsorption method. The uranium adsorption method comprises the following steps: (1) mixing paraffin containing 6-10 carbon atoms with a span emulsifier to obtain a continuous phase; the preparation method comprises the following steps: mixing 1-vinyl imidazole, N, N-methylene bisacrylamide and azodiisobutyronitrile to obtain a dispersed phase; wherein on the basis of 45 mL of 1-vinyl imidazole, the use amount of the N, N-methylene bisacrylamide is 3 to 7 g, and the use amount of the span emulsifier is 10 to 30 mL; adding the dispersed phase into the continuous phase, heating to T1, and then heating to T2 to obtain the uranium adsorption material, wherein T1 ranges from 85 DEG C to 95 DEG C, the time from the initial temperature to T1 ranges from 1.5 h to 2.5 h, and T2 ranges from 95 DEG C to 110 DEG C; (2) placing the uranium adsorption material in a uranium solution for adsorption; the pH value of the uranium solution is 4.5-6. By adopting the uranium adsorption method, the uranium adsorption capacity of the uranium adsorption material can be improved.

Description

Technical Field

[0001] The invention relates to a uranium adsorption method. Background Art

[0002] Nuclear energy is an important clean energy source that replaces fossil fuels and reduces environmental pollution in many ways. Uranium is the main raw material for nuclear energy. However, the mining of uranium mines on land will produce a large amount of uranium-containing wastewater, causing serious environmental pollution and endangering human health. It also leads to a shortage of uranium resources on land. The uranium resources in the ocean are abundant. Extracting uranium from seawater can solve the problem of energy shortage and reduce the environmental problems caused by land mining.

[0003] The adsorption method for extracting uranium is considered to be an applicable and reliable method due to its simple operation, low cost, high efficiency and environmental friendliness. Summary of the invention

[0004] The object of the present invention is to provide a uranium adsorption method, which can improve the uranium adsorption capacity of a uranium adsorption material.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions.

[0006] The uranium adsorption method of the present invention comprises the following steps:

[0007] (1) mixing a chain alkane containing 6 to 10 carbon atoms and a Span emulsifier to obtain a continuous phase; mixing 1-vinylimidazole, N,N-methylenebisacrylamide and azobisisobutyronitrile to obtain a dispersed phase; wherein, based on 45 mL of 1-vinylimidazole, the amount of N,N-methylenebisacrylamide is 3 to 7 g, and the amount of the Span emulsifier is 10 to 30 mL;

[0008] Add the dispersed phase to the continuous phase and heat to T1, and then heat to T2 to obtain a uranium adsorbent material; wherein T1 is 85-95°C, the time from the initial temperature to T1 is 1.5-2.5h, and T2 is 95-110°C;

[0009] (2) placing the uranium adsorption material in a uranium solution for adsorption; the pH value of the uranium solution is 4.5-6.

[0010] Preferably, based on 45 mL of 1-vinyl imidazole, the amount of N,N-methylenebisacrylamide used is 4 to 5 g, which helps to improve the uranium adsorption performance of the uranium adsorption material.

[0011] Preferably, based on 45 mL of 1-vinyl imidazole, the amount of the Span emulsifier is 15 to 25 mL, which helps to improve the uniformity of the uranium adsorbent material and obtain a uranium adsorbent material with a suitable particle size.

[0012] Preferably, T1 is 88-92° C. Preferably, the time from the initial temperature to T1 is 1.8-2 hours. This helps the reaction proceed smoothly and obtains a uranium adsorption material with a high uranium adsorption capacity.

[0013] Preferably, T2 is 100-105° C. The time for heating from T1 to T2 can be 1.5-8 hours, preferably 5-6 hours. This helps the reaction proceed smoothly and obtains a uranium adsorption material with a high uranium adsorption capacity.

[0014] Preferably, the pH of the uranium solution is 5 to 5.5. The pH of the uranium solution can be adjusted by sodium hydroxide and nitric acid. Such adsorption conditions are helpful to improve the uranium adsorption capacity of the uranium adsorption material.

[0015] According to the uranium adsorption method of the present invention, preferably, the chain alkane containing 6 to 10 carbon atoms is selected from one or more of isooctane and heptane; and the Span emulsifier is selected from one or more of Span60, Span80 and Span83.

[0016] More preferably, the paraffin is isooctane. More preferably, the Span emulsifier is Span80.

[0017] According to the uranium adsorption method of the present invention, preferably, based on 45 mL of 1-vinyl imidazole, the amount of the alkane containing 6 to 10 carbon atoms is 150 to 300 mL, and the amount of azobisisobutyronitrile is 0.05 to 0.5 g.

[0018] More preferably, the amount of the alkane containing 6 to 10 carbon atoms is 200 to 250 mL based on 45 mL of 1-vinylimidazole.

[0019] More preferably, the amount of azobisisobutyronitrile used is 0.1 to 0.2 g based on 45 mL of 1-vinylimidazole.

[0020] According to the uranium adsorption method of the present invention, preferably, the chain alkane containing 6 to 10 carbon atoms and the Span emulsifier are stirred at 30 to 60° C. for 0.5 to 5 hours to obtain a continuous phase.

[0021] More preferably, the paraffin containing 6 to 10 carbon atoms and the Span emulsifier are stirred at 40 to 50° C. More preferably, the stirring time is 1 to 2 hours, which helps to improve the uniformity of the continuous phase.

[0022] According to the uranium adsorption method of the present invention, preferably, the temperature is kept at T2 for 0.5 to 3 hours. More preferably, the temperature is kept at T2 for 1 to 2 hours.

[0023] According to the uranium adsorption method of the present invention, preferably, the concentration of the uranium solution is 80-100 mg / L.

[0024] More preferably, the concentration of the uranium solution is 90-95 mg / L.

[0025] According to the uranium adsorption method of the present invention, preferably, the mass volume ratio of the uranium adsorption material to the uranium solution is (0.05-0.2) g / 100 mL.

[0026] More preferably, the mass volume ratio of the uranium adsorbent material to the uranium solution is (0.1-0.15) g / 100 mL.

[0027] According to the uranium adsorption method of the present invention, preferably, a static adsorption method is adopted, and the adsorption time is 6 to 15 hours.

[0028] More preferably, the adsorption time is 8 to 10 hours.

[0029] According to the uranium adsorption method of the present invention, preferably, the uranium adsorption material is placed in a uranium solution and then statically adsorbed in a shaking table; the rotation speed of the shaking table is 100-200 r / min.

[0030] More preferably, the rotation speed of the shaking table is 150-170 r / min.

[0031] According to the uranium adsorption method of the present invention, preferably, the uranium adsorption capacity of the uranium adsorption material is ≥65 mg / g.

[0032] More preferably, the uranium adsorption capacity of the uranium adsorption material is ≥ 68 mg / g. In certain embodiments, the uranium adsorption capacity of the uranium adsorption material is 68-70 mg / g.

[0033] The invention adopts a specific method to prepare the uranium adsorption material, and the uranium adsorption material is used to adsorb uranium in a uranium solution under specific conditions to improve the uranium adsorption capacity of the uranium adsorption material. DETAILED DESCRIPTION

[0034] The present invention is further described below in conjunction with specific embodiments, but the protection scope of the present invention is not limited thereto.

[0035] Here is the test method:

[0036] Uranium adsorption capacity: Uranium solution concentration is C o , in mg / L; take the supernatant of the adsorbed uranium solution and determine its uranium concentration as C, in mg / L. Calculate the uranium adsorption capacity (Q) of the uranium adsorption material according to the following formula:

[0037] Q=[(C o -C)×0.1] / 0.1.

[0038] Example 1

[0039] 230 mL of isooctane and 21 mL of Span80 were stirred at 40°C for 1 h to obtain a continuous phase.

[0040] 45 mL of 1-vinylimidazole, 5 g of N,N-methylenebisacrylamide and 0.1 g of azobisisobutyronitrile were mixed to obtain a dispersed phase.

[0041] The dispersed phase is added to the continuous phase and heated to 90°C after 2 hours, and then to 100°C after 6 hours. The temperature is kept at 100°C for 1 hour to volatilize isooctane and obtain uranium adsorption material.

[0042] 0.1 g of uranium adsorption material was placed in 100 mL of uranium solution with a concentration of 91 mg / L, and then statically adsorbed in a shaker for 8 hours to obtain the adsorbed material. The shaker speed was 150 r / min. The pH of the uranium solution was 5. The pH of the uranium solution was adjusted by sodium hydroxide and nitric acid.

[0043] The uranium adsorption capacity of the uranium adsorption material is 68.3 mg / g.

[0044] Comparative Example 1

[0045] 230 mL of isooctane and 21 mL of Span80 were stirred at 40°C for 1 h to obtain a continuous phase.

[0046] 45 mL of 1-vinylimidazole, 5 g of N,N-methylenebisacrylamide and 0.1 g of azobisisobutyronitrile were mixed to obtain a dispersed phase.

[0047] The dispersed phase is added to the continuous phase and heated to 90°C after 2 hours, and then to 100°C after 6 hours. The temperature is kept at 100°C for 1 hour to volatilize isooctane and obtain uranium adsorption material.

[0048] 0.1 g of uranium adsorption material was placed in 100 mL of uranium solution with a concentration of 91 mg / L, and then statically adsorbed in a shaker for 8 hours to obtain the adsorbed material. The shaker speed was 150 r / min. The pH of the uranium solution was 2. The pH of the uranium solution was adjusted by sodium hydroxide and nitric acid.

[0049] The uranium adsorption capacity of the uranium adsorbent material is 12.1 mg / g.

[0050] Comparative Example 2

[0051] 230 mL of isooctane and 21 mL of Span80 were stirred at 40°C for 1 h to obtain a continuous phase.

[0052] 45 mL of 1-vinylimidazole, 5 g of N,N-methylenebisacrylamide and 0.1 g of azobisisobutyronitrile were mixed to obtain a dispersed phase.

[0053] The dispersed phase is added to the continuous phase and heated to 90°C after 2 hours, and then to 100°C after 6 hours. The temperature is kept at 100°C for 1 hour to volatilize isooctane and obtain uranium adsorption material.

[0054] 0.1 g of uranium adsorption material was placed in 100 mL of uranium solution with a concentration of 91 mg / L, and then statically adsorbed in a shaker for 8 hours to obtain the adsorbed material. The shaker speed was 150 r / min. The pH of the uranium solution was 4. The pH of the uranium solution was adjusted by sodium hydroxide and nitric acid.

[0055] The uranium adsorption capacity of the uranium adsorbent material is 32.3 mg / g.

[0056] Comparative Example 3

[0057] 230 mL of isooctane and 21 mL of Span80 were stirred at 40°C for 1 h to obtain a continuous phase.

[0058] 45 mL of 1-vinylimidazole, 5 g of N,N-methylenebisacrylamide and 0.1 g of azobisisobutyronitrile were mixed to obtain a dispersed phase.

[0059] The dispersed phase is added to the continuous phase and heated to 90°C after 2 hours, and then to 100°C after 6 hours. The temperature is kept at 100°C for 1 hour to volatilize isooctane and obtain uranium adsorption material.

[0060] 0.1 g of uranium adsorption material was placed in 100 mL of uranium solution with a concentration of 91 mg / L, and then statically adsorbed in a shaker for 8 hours to obtain the adsorbed material. The shaker speed was 150 r / min. The pH of the uranium solution was 7. The pH of the uranium solution was adjusted by sodium hydroxide and nitric acid.

[0061] The uranium adsorption capacity of the uranium adsorption material is 47.2 mg / g.

[0062] Comparative Example 4

[0063] 230 mL of isooctane and 21 mL of Span80 were stirred at 40°C for 1 h to obtain a continuous phase.

[0064] 45 mL of 1-vinylimidazole, 2 g of N,N-methylenebisacrylamide and 0.1 g of azobisisobutyronitrile were mixed to obtain a dispersed phase.

[0065] The dispersed phase is added to the continuous phase and heated to 90°C after 2 hours, and then to 100°C after 6 hours. The temperature is kept at 100°C for 1 hour to volatilize isooctane and obtain uranium adsorption material.

[0066] 0.1 g of uranium adsorption material was placed in 100 mL of uranium solution with a concentration of 91 mg / L, and then statically adsorbed in a shaker for 8 hours to obtain the adsorbed material. The shaker speed was 150 r / min. The pH of the uranium solution was 5. The pH of the uranium solution was adjusted by sodium hydroxide and nitric acid.

[0067] The uranium adsorption capacity of the uranium adsorbent material is 37.7 mg / g.

[0068] Comparative Example 5

[0069] 230 mL of isooctane and 21 mL of Span80 were stirred at 40°C for 1 h to obtain a continuous phase.

[0070] 45 mL of 1-vinylimidazole, 8 g of N,N-methylenebisacrylamide and 0.1 g of azobisisobutyronitrile were mixed to obtain a dispersed phase.

[0071] The dispersed phase is added to the continuous phase and heated to 90°C after 2 hours, and then to 100°C after 6 hours. The temperature is kept at 100°C for 1 hour to volatilize isooctane and obtain uranium adsorption material.

[0072] 0.1 g of uranium adsorption material was placed in 100 mL of uranium solution with a concentration of 91 mg / L, and then statically adsorbed in a shaker for 8 hours to obtain the adsorbed material. The shaker speed was 150 r / min. The pH of the uranium solution was 5. The pH of the uranium solution was adjusted by sodium hydroxide and nitric acid.

[0073] The uranium adsorption capacity of the uranium adsorption material is 23.4 mg / g.

[0074] Comparative Example 6

[0075] Except for the following steps, the rest is the same as Example 1:

[0076] The dispersed phase was added to the continuous phase and heated, and the temperature was raised to 100° C. after 2 hours. The temperature was kept at 100° C. for 1 hour to volatilize the isooctane and obtain the uranium adsorbent material.

[0077] The uranium adsorption capacity of the uranium adsorption material is 49.7 mg / g.

[0078] The present invention is not limited to the above-mentioned embodiments. Without departing from the essential content of the present invention, any deformation, improvement and substitution that can be conceived by those skilled in the art shall fall within the scope of the present invention.

Claims

1. A uranium adsorption method, characterized in that: The steps include: (1) mixing a chain alkane containing 6 to 10 carbon atoms and a Span emulsifier to obtain a continuous phase; mixing 1-vinylimidazole, N,N-methylenebisacrylamide and azobisisobutyronitrile to obtain a dispersed phase; wherein, based on 45 mL of 1-vinylimidazole, the amount of N,N-methylenebisacrylamide is 3 to 7 g, and the amount of the Span emulsifier is 10 to 30 mL; Add the dispersed phase to the continuous phase and heat to T1, and then heat to T2 to obtain a uranium adsorbent material; wherein T1 is 85-95°C, the time from the initial temperature to T1 is 1.5-2.5h, and T2 is 95-110°C; (2) placing the uranium adsorption material in a uranium solution for adsorption; the pH value of the uranium solution is 4.5-6.

2. The uranium adsorption method according to claim 1, characterized in that: The chain alkane containing 6 to 10 carbon atoms is selected from one or more of isooctane and heptane; the Span emulsifier is selected from one or more of Span60, Span80 and Span83.

3. The uranium adsorption method according to claim 1, characterized in that: Based on 45 mL of 1-vinyl imidazole, the amount of the alkane containing 6 to 10 carbon atoms is 150 to 300 mL, and the amount of azobisisobutyronitrile is 0.05 to 0.5 g.

4. The uranium adsorption method according to claim 1, characterized in that: Stir a chain alkane containing 6 to 10 carbon atoms and a Span-type emulsifier at 30 to 60° C. for 0.5 to 5 hours to obtain a continuous phase.

5. The uranium adsorption method according to claim 1, characterized in that: Keep warm at T2 for 0.5 to 3 hours.

6. The uranium adsorption method according to claim 1, characterized in that: The concentration of uranium solution is 80-100 mg / L.

7. The uranium adsorption method according to claim 1, characterized in that: The mass volume ratio of the uranium adsorption material to the uranium solution is (0.05-0.2) g / 100 mL.

8. The uranium adsorption method according to claim 1, characterized in that: The static adsorption method is adopted, and the adsorption time is 6 to 15 hours.

9. The uranium adsorption method according to claim 1, characterized in that: The uranium adsorption material is placed in the uranium solution and then statically adsorbed in a shaking table; the rotation speed of the shaking table is 100-200r / min.

10. The uranium adsorption method according to any one of claims 1 to 9, characterized in that: The uranium adsorption capacity of the uranium adsorption material is ≥65 mg / g.