Method for extracting and separating cesium ions from aqueous phase

A technology in cesium ion and water phase, which is applied in the field of nuclear fuel cycle and achieves the effect of good application prospect, improved extraction capacity and wide adaptability

Inactive Publication Date: 2010-02-03
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the extraction of cesium ions by the c...

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Embodiment 1, extracting Cs from neutral aqueous phase containing cesium ions +

[0019] When carrying out the cesium ion extraction experiment, take 0.5ml containing a certain amount of BPC6 (purchased from Tsinghua University Institute of Nuclear and New Energy Technology) C n mimNTf 2 Ionic liquid (purchased from the Green Chemistry Center of Lanzhou Institute of Chemistry and Physics, Chinese Academy of Sciences, website www.ionicliquid.org) and 0.5ml of aqueous phase containing a certain amount of cesium ions, adding tracer radioactivity to the system 134 Cs, fully mixed, oscillated, and centrifuged to separate phases, respectively take the upper and lower phases and measure the counts of the two phases with an automatic γ counter, thereby obtaining the extraction rate E or distribution ratio D.

[0020] The cesium ion-containing aqueous phase adopted in the present embodiment is neutral, and Cs + The concentration is 0.01mol / L, without other interfering ions. ...

Embodiment 2

[0026] Example 2, extracting Cs from acidic aqueous phase containing cesium ions +

[0027] The aqueous phase containing cesium ions used in this example is acidic and does not contain other interfering ions.

[0028] Using C containing BPC6 concentration of 0.015mol / L n mimNTf 2 Ionic liquids (purchased from the Green Chemistry Center of Lanzhou Institute of Chemistry and Physics, Chinese Academy of Sciences, website www.ionicliquid.org) have different effects on Cs in aqueous phase with different acid concentrations. + ([Cs + ] is 0.01mol / L) to extract, and the results are shown in Table 2.

[0029] Table 2

[0030]

[0031] With the cesium ion extraction rate (E / %) in table 2 and the concentration of nitric acid in the aqueous phase, see figure 2 .

[0032] Depend on figure 2 It can be seen that the addition of nitric acid will make the system + The extraction performance is generally decreased. But even when the concentration of nitric acid in the aqueous ph...

Embodiment 3

[0033] Example 3, Extracting Cs from simulated high-level radioactive waste +

[0034] When carrying out the cesium ion extraction experiment, take 0.5ml containing a certain amount of BPC6 (purchased from Tsinghua University Institute of Nuclear and New Energy Technology) C n mimNTf 2 Ionic liquid (purchased from the Green Chemistry Center of Lanzhou Institute of Chemistry and Physics, Chinese Academy of Sciences, website www.ionicliquid.org) and 0.5ml of aqueous phase containing a certain amount of cesium ions and other ions or compounds, adding tracer radioactivity to the system 134 Cs, fully mixed, oscillated, and centrifuged to separate phases, respectively take the upper and lower phases and measure the counts of the two phases with an automatic γ counter, thereby obtaining the extraction rate E or distribution ratio D.

[0035] The cesium ion-containing aqueous phase adopted in this embodiment (simulated high-level waste liquid, wherein [HNO 3 ]=1.3mol / L) is shown in...

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Abstract

The invention discloses a method for extracting and separating cesium ions from an aqueous phase. In the method, hydrophobic ion liquid serves as a diluting agent and 25, 27-2(2-propoxy) calixarene [4]-26, 28-crown-6 serves as an extracting agent so as to extract cesium ions from an aqueous solution containing cesium ions. The method can be used for efficiently extracting the cesium ions from theaqueous phase, and the extracting distribution ratio can reach more than 10<3> at most. Ion liquid almost has no volatility, thus the system is environmental-friendly. The extracting system of the invention has a wide applicable range to different aqueous phase conditions and has favorable application prospect in the related field of extracting the cesium ions from high activity liquid waste.

Description

technical field [0001] The invention relates to the field of nuclear fuel cycle, in particular to a method for extracting and separating cesium ions from spent fuel reprocessing high-level waste liquid. Background technique [0002] 137 Cs is a high heat-releasing nuclide present in the high-level waste liquid formed by the reprocessing of spent fuel, with a half-life of 30.17 years. It is one of the main sources of radioactivity and heat release in the high-level waste liquid. must be removed prior to final geological disposal. At the same time, the separated 137 Cs can also replace 60 Co is used as a radiation source for scientific research or industrial production. Currently, for spent fuel high-level liquid waste 137 The separation of Cs has also carried out various researches at home and abroad. The extraction agents used are mainly crown ethers and calixaryncrown compounds, and the solvents used are various volatile organic solvents, such as n-octanol, nitro Arom...

Claims

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Application Information

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IPC IPC(8): C22B3/36C22B26/10
CPCY02P10/20
Inventor 沈兴海徐超高宏成陈庆德
Owner PEKING UNIV
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