Separation and purification method of ruthenium in irradiation uranium target

A separation, purification and irradiation technology is applied in the field of separation and purification of ruthenium in irradiated uranium targets, which can solve the problems of inability to take into account the decontamination effect and the need for mass spectrometry measurement, and achieves good decontamination effect, high recovery rate and reasonable conditions. Applicable Effects

Active Publication Date: 2014-06-25
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] In order to solve the problems of separation and purification of ruthenium by the existing oxidation extraction-reduction stripping method, the decontamination effect and the need for mass spectrometry cannot be taken into account, and a method for separation and purification of ruthenium in irradiated uranium targets is provided.

Method used

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  • Separation and purification method of ruthenium in irradiation uranium target
  • Separation and purification method of ruthenium in irradiation uranium target
  • Separation and purification method of ruthenium in irradiation uranium target

Examples

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Effect test

Embodiment 1

[0020] A method for separating and purifying ruthenium in an irradiated uranium target adopts an oxidation extraction-reduction stripping method, and the steps are as follows:

[0021] (1) Dissolve the irradiated uranium target with hot nitric acid, and after the solution is cooled, extract twice with 30% TBP kerosene to separate and remove uranium and plutonium;

[0022] (2) Evaporate the raffinate to dryness, dissolve the obtained substance in sulfuric acid with a concentration of 0.6mol / L, add Ce(SO 4 ) 2 The sulfuric acid with a concentration of 0.6mol / L oxidizes ruthenium to RuO 4 ;

[0023] (3) Add carbon tetrachloride to extract RuO 4 ;

[0024] (4) Take the organic phase and wash it twice with sulfuric acid with a concentration of 0.6mol / L;

[0025] (5) Using ascorbic acid aqueous solution with a concentration of 0.03 mol / L as the aqueous reverse extraction of ruthenium to obtain a ruthenium reverse extraction solution.

[0026] The test results of Example 1 are ...

Embodiment 2

[0033] A method for separating and purifying ruthenium in an irradiated uranium target adopts an oxidation extraction reduction stripping method, and the steps are as follows:

[0034] (1) Dissolve the irradiated uranium target with hot nitric acid, and after the solution is cooled, extract twice with 30% TBP-kerosene to separate and remove uranium and plutonium;

[0035] (2) Evaporate the raffinate to dryness, dissolve the obtained substance with sulfuric acid with a concentration of 0.4mol / L, add Ce(SO 4 ) 2 The sulfuric acid with a concentration of 0.4mol / L oxidizes ruthenium to RuO 4 ;

[0036] (3) Add carbon tetrachloride to extract RuO 4 ;

[0037] (4) Take the organic phase and wash it twice with sulfuric acid with a concentration of 0.4mol / L;

[0038] (5) Using ascorbic acid aqueous solution with a concentration of 0.01 mol / L as the aqueous reverse extraction of ruthenium to obtain a ruthenium reverse extraction solution.

Embodiment 3

[0040] A method for separating and purifying ruthenium in an irradiated uranium target adopts an oxidation extraction-reduction stripping method, and the steps are as follows:

[0041] (1) Dissolve the irradiated uranium target with hot nitric acid, and after the solution is cooled, extract twice with 30% TBP-kerosene to separate and remove uranium and plutonium;

[0042] (2) Evaporate the raffinate to dryness, dissolve the obtained substance with sulfuric acid with a concentration of 0.8mol / L, add Ce(SO 4 ) 2 The sulfuric acid with a concentration of 0.8mol / L oxidizes ruthenium to RuO 4 ;

[0043] (3) Add carbon tetrachloride to extract RuO 4 ;

[0044] (4) Take the organic phase and wash it twice with sulfuric acid with a concentration of 0.8mol / L;

[0045] (5) Using ascorbic acid aqueous solution with a concentration of 0.08 mol / L as the aqueous reverse extraction of ruthenium to obtain a ruthenium reverse extraction solution.

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Abstract

The invention relates to a method for separating and purifying a chemical element by use of an oxidation extraction-reduction back-extraction method. In order to solve the problems that the existing oxidation extraction-reduction back-extraction method can not give consideration to the needs for decontamination effect and mass-spectrometer measurement when in separation and purification of ruthenium and the like, the invention provides a separation and purification method of ruthenium in an irradiation uranium target. With an oxidation extraction-reduction back-extraction method, the separation and purification method comprises the following steps of: (1) dissolving the irradiation uranium target with hot nitric acid, and extracting to remove uranium and plutonium; (2) evaporating the raffinate to dryness, dissolving the obtained substrate with dilute sulphuric acid, and adding dilute sulphuric acid containing Ce(SO4)2 to oxidize ruthenium into RuO4; (3) adding carbon tetrachloride to extract RuO4; (4) washing the organic phase with dilute sulphuric acid twice; and (5) performing back extraction of ruthenium by taking the aqueous solution of dilute ascorbic acid as an aqueous phase to obtain ruthenium back-extraction liquid. The separation and purification method provided by the invention realizes a good decontamination effect and a high yield of ruthenium; the selected oxidation and reduction back-extraction conditions are reasonable and appropriate; and the ruthenium back-extraction liquid can be directly subjected to mass-spectrometer measurement.

Description

technical field [0001] The invention relates to a method for separating and purifying chemical elements by using an oxidation extraction-reduction stripping method, in particular to a method for separating and purifying ruthenium in an irradiated uranium target. Background technique [0002] The fission yield of ruthenium is high, and the yield of each isotope of ruthenium produced by fission of uranium and plutonium is quite different, so the isotope composition of fission ruthenium may be related to the burnup of spent fuel. Due to the complex matrix of irradiated samples or waste liquid samples, it is necessary to separate ruthenium from the matrix in order to achieve isotope analysis of fission ruthenium. At the same time, because elements such as Mo and Pd interfere with the mass spectrometry analysis of ruthenium isotopes, the separation and purification method of ruthenium requires It has a high decontamination coefficient for these fission products, and the separated...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/26C22B11/00
Inventor 常志远赵永刚张继龙郝小娟朱留超
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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