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Method for extracting and separating uranyl ions from aqueous phase

A technology for separating uranyl ions and uranyl ions, which is applied in the field of nuclear fuel cycle, can solve the problems of not many, the extraction rate of uranyl ions is not very high, and achieves the effects of good application prospects, improved extraction capacity, and wide adaptability

Inactive Publication Date: 2011-05-18
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In general, there are not many reports on the extraction and separation of uranyl ions using ionic liquid systems, and in the reported studies, the extraction rate of uranyl ions is not very high, especially when the traditional extraction agent tributyl phosphate is used. , it is often necessary to maintain a high acidity of the solution in order to have a certain extraction effect on uranyl ions

Method used

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  • Method for extracting and separating uranyl ions from aqueous phase
  • Method for extracting and separating uranyl ions from aqueous phase
  • Method for extracting and separating uranyl ions from aqueous phase

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1. Extraction of UO from neutral aqueous phase containing uranyl ions 2 2+

[0018] When carrying out the uranyl ion extraction experiment, take 0.5 ml of ionic liquid containing a certain amount of CMPO (purchased from STREM, USA, product number: 15-3500) and 1.0 ml of an aqueous phase containing a certain amount of uranyl ions and other ions or compounds, Mix well, then vibrate for 30 minutes, after centrifugation and phase separation, take the upper aqueous phase to analyze the concentration of uranyl ions (Arsenazo III method). than D.

[0019] C containing different concentrations of CMPO 2 mimNTf 2 For uranyl ions ([UO 2 2+ ]=0.01mol / L) in the aqueous solution of uranyl ion extraction, the results are shown in Table 1.

[0020] Table 1

[0021]

[0022] With the uranyl ion extraction rate (E / %) and CMPO concentration plotting in table 1, the results are shown in figure 1 .

[0023] Depend on figure 1 It can be seen that under neutral conditio...

Embodiment 2

[0024] Example 2, Extraction of UO from the acidic aqueous phase containing uranyl ions 2 2+

[0025] The aqueous phase containing uranyl ions used in this example is acidic and does not contain other interfering ions.

[0026] Using C containing CMPO concentration of 0.020mol / L n mimNTf 2 Effect of ionic liquids on uranyl ions ([UO 2 2+ ]=0.005mol / L, and the concentration of nitric acid is 0-3mol / L) for extraction, and the extraction rates are all substantially greater than 70%. The results are shown in Table 2.

[0027] Table 2

[0028]

[0029] With the uranyl ion extraction rate (E / %) in table 2 and the concentration of nitric acid in the aqueous phase, the results are shown in figure 2 .

[0030] Depend on figure 2 It can be seen that when different ionic liquids containing 0.02mol / L CMPO extract 0.005mol / L uranyl ions, the extraction rate changes with the concentration of nitric acid in the aqueous phase. Specifically, for C 4 mimNTf 2 、C 6 mimNTf 2 s...

Embodiment 3

[0032] Example 3, Extraction of UO from the aqueous phase containing uranyl ions and interfering ions such as sodium and potassium 2 2+

[0033] With 0.02mol / L CMPO / C 4 mimNTf 2 Extract 0.005mol / L UO 2 2+ system as an example, when the water phase contains 0.05mol / L~0.5mol / L of inorganic salt NaNO 3 or KNO 3 , the extraction rate of 0.005mol / L uranyl ions in the system is between 72-76% (see Table 3 for details), which is slightly lower than the extraction rate (79%) of the system for uranyl ions in the absence of inorganic salts, indicating that NaNO 3 or KNO 3 It has little effect on the extraction of uranyl ions from the system.

[0034] table 3

[0035]

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Abstract

The invention discloses a method for extracting and separating uranyl ions from an aqueous phase. In the method, hydrophobic ion liquid serves as a diluting agent and octyl phenyl group-N, N-diisobutylamine formacyl methylphosphineoxide serves as an extracting agent so as to extract uranyl ions from an aqueous solution containing the uranyl ions. The method can be used for efficiently extracting the cesium ions from the aqueous phase, and the extracting distribution ratio can reach more than 10<3> at most. The method has a wide applicable range to different aqueous phase acidity conditions, and can be used for extracting the cesium ions from neutral conditions to 3MHNO3; ion liquid serves as a diluting agent, and phenomena which are disadvantageous to technology such as emulsification in the process of extracting the cesium ions do not exist. Ion liquid almost has no volatility, thus the system is environmental-friendly. To sum up, the method of the invention has favorable application prospect in the field of nuclear fuel recycling.

Description

technical field [0001] The invention relates to the field of nuclear fuel cycle, in particular to a method for extracting and separating uranyl ions from water phase. Background technique [0002] Uranium is currently the most important nuclear fuel in nuclear energy utilization, and its mining, extraction, and separation are of great significance to the sustainable development of nuclear energy. Currently, solvent extraction is an indispensable means for the separation and purification of uranium in the nuclear fuel cycle. Various liquid-liquid extraction processes for uranium have been developed, such as the Purex process. However, these liquid-liquid extraction processes all use certain volatile organic solvents such as kerosene, and the efficiency of single extraction is not very high, and multi-stage extraction is usually required. Uranyl ion is a main chemical form of uranium in aqueous solution. Using ionic liquids instead of toxic, flammable and volatile organic so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/38C22B60/02
CPCY02P10/20
Inventor 沈兴海徐超高宏成陈庆德
Owner PEKING UNIV
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