Method for separating neptunium from uranium product by TEVA-UTEVA extraction chromatographic column

A chromatographic column and product technology, applied in the field of nuclear fuel cycle, can solve the problems of complex separation process and low recovery rate, and achieve the effects of simple separation process, small column volume, and reduced time required for separation

Active Publication Date: 2014-07-30
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] The present invention overcomes the disadvantages of low recovery rate and complicated separation process in the prior art, and provides a single price adjustment in the whole separation process, simple separation process, high recovery rate and precision, high separation efficiency, stable recovery, and the use of TEVA- UTEVA Extraction Chromatography Column Separation of Uranium and Neptunium Ratio of 10 6 :1 Method for Neptunium in Uranium Samples

Method used

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  • Method for separating neptunium from uranium product by TEVA-UTEVA extraction chromatographic column
  • Method for separating neptunium from uranium product by TEVA-UTEVA extraction chromatographic column
  • Method for separating neptunium from uranium product by TEVA-UTEVA extraction chromatographic column

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] as per figure 1As shown in the schematic diagram of the separation process, take 1 mL of uranium sample, adjust the concentration of nitric acid to 2 mol / L, then add 0.1 mL of 0.5 mol / L ferrous sulfamate (FS) solution, let it stand for 5 to 10 minutes, and reduce neptunium to Np(Ⅳ); put the sample after acid adjustment and price adjustment on TEVA extraction column, use 10mL1.5mol / LHNO 3 -0.05mol / L FS mixed solution to rinse uranium; then use 5mL2mol / L HNO 3 -0.2mol / L H 2 C 2 o 4 The neptunium in the TEVA extraction chromatography column was eluted, and the eluent was collected. Add 5mL2mol / L HNO to the eluent 3 After shaking well, put the solution on the UTEVA extraction chromatography column, and use 3mL2mol / L HNO 3 -0.1mol / L H 2 C 2 o 4 The distribution of uranium on the UTEVA column is basically not affected by elution, while Np(IV) has a strong elution ability, but the elution effect on U(VI) is poor, so that neptunium can be separated from a large amount ...

Embodiment 2

[0041] Take 1mL of uranium sample, adjust the acidity of nitric acid to 3mol / L, then add 0.1mL of 0.5mol / L ferrous sulfamate (FS) solution, let it stand for 5-10 minutes, and reduce neptunium to Np(IV); The sample after acid adjustment and price adjustment is put on the TEVA extraction column, using 10mL3mol / L HNO 3 -0.05mol / LFS mixed solution to wash uranium; then use 5mL2mol / L HNO 3 -0.2mol / L H 2 C 2 o 4 The neptunium in the TEVA extraction chromatography column was eluted, and the eluent was collected. Add 10mL2mol / L HNO to the eluent 3 After shaking well, put the solution on the UTEVA extraction chromatography column, and use 3mL2mol / L HNO 3 -0.1mol / L H 2 C 2 o 4 The distribution of uranium on the UTEVA column is basically not affected by elution, while Np(IV) has a strong elution ability, but the elution effect on U(VI) is poor, so that neptunium can be separated from a large amount of uranium.

Embodiment 3

[0043] In order to verify the effect of the present invention for separating neptuntium in a large amount of uranium, this example prepared a certain ratio of simulated neptuntium separation in uranium products before the experiment.

[0044] (1) Configuration of simulated samples

[0045] The simulation sample is prepared according to the ratio of uranium, neptunium and plutonium in the uranium product, and the sample matrix solution is 3.0mol / L HNO 3 , whose composition is shown in Table 2.

[0046] Table 2 Composition of simulated samples

[0047]

[0048] (2) Determination of simulated samples

[0049] Take 1mL sample, add 0.1mL of 0.5mol / L ferrous sulfamate (FS) solution, let it stand for 5-10 minutes, and reduce neptunium to Np(IV); put the sample after acid adjustment and price adjustment on TEVA extraction column, use 10mL3mol / LHNO 3 -0.05mol / LFS mixed solution to wash uranium; then use 5mL2mol / LHNO 3 -0.2mol / LH 2 C 2 o 4 The neptunium in the TEVA extraction...

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Abstract

The invention discloses a method for separating neptunium (Np) from a uranium product by a TEVA-UTEVA extraction chromatographic column. The method comprises the following steps: (1) adding an acidic solution and a reducing agent into the uranium product to stabilize the neptunium into Np (IV), separating the neptunium from the uranium by a TEVA levextrel resin, and desorbing the neptunium by the mixed solution of nitric acid and oxalic acid; and (2) allowing the eluent to pass through a UTEVA extraction chromatographic column to further purify the neptunium. According to the method provided by the invention, the two separation processes only need one-time price adjustment and are simple; the method is high in recovery rate, precision and separation efficiency and stable in recovery; and the neptunium is separated from the uranium product with the ratio of the uranium to the neptunium of 106:1 by the TEVA-UTEVA extraction chromatographic column.

Description

technical field [0001] The invention relates to the technical field of nuclear fuel cycle, in particular to a method for separating neptunium in a large amount of uranium products by using a TEVA-UTEVA extraction chromatography column. Background technique [0002] Neptunium is a highly toxic element, and the control requirements for neptunium in uranium products after nuclear fuel reprocessing are very strict. Therefore, the analysis of neptunium content in uranium products at the back end of the nuclear fuel cycle is very important. However, the content of neptunium in the uranium products of nuclear fuel reprocessing is very low, and the analysis is difficult. Whether using radioactive analysis methods or mass spectrometry methods, constant uranium has a great influence on the measurement. Therefore, it is particularly important to establish an accurate, reliable, simple and easy separation method for uranium and neptunium. [0003] At present, in the operating procedur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B60/02
Inventor 苏玉兰金花应浙聪赵胜洋
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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