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CN-121972001-A - Ionic liquid-liquid phase separation system and application thereof in separating strontium and yttrium

CN121972001ACN 121972001 ACN121972001 ACN 121972001ACN-121972001-A

Abstract

The application relates to the technical field of separation, in particular to an ionic liquid-liquid phase separation system and application thereof in separating strontium and yttrium. The ionic liquid-liquid phase separation system comprises an anionic surfactant and an organic base, wherein the octanol-water partition coefficient (log P) of the anionic surfactant is more than or equal to 1.0. The application provides an ionic liquid-liquid phase separation system and application thereof in separating strontium and yttrium, which can efficiently and environmentally-friendly realize the separation of strontium and yttrium.

Inventors

  • WANG WENTAO
  • YAN RUIHAN
  • YAN TAIHONG
  • CAO ZHI
  • WANG JUNLI
  • WANG HUI

Assignees

  • 中国原子能科学研究院

Dates

Publication Date
20260505
Application Date
20260212

Claims (10)

  1. 1. The ionic liquid-liquid phase separation system is characterized by comprising an anionic surfactant and an organic base, wherein the octanol-water partition coefficient (log P) of the anionic surfactant is greater than or equal to 1.0.
  2. 2. The ionic liquid-liquid phase separation system as claimed in claim 1, wherein the organic base comprises one or more of dodecylprimary amine, benzylamine, n-octylamine and diphenylethylenediamine.
  3. 3. The ionic liquid-liquid phase separation system as claimed in claim 1 or 2, wherein the anionic surfactant comprises one or more of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, sodium dodecyl sulfonate, sodium stearate and sodium phosphatidate.
  4. 4. The ionic liquid-liquid phase separation system according to any one of claims 1 to 3, wherein the molar ratio of the anionic surfactant to the organic base is 1 (0.5 to 2).
  5. 5. The application of the ionic liquid-liquid phase separation system in separating strontium and yttrium according to any one of claims 1-3, which is characterized by comprising the steps of mixing an anionic surfactant, an organic base and a mixed metal salt solution to obtain a mixed solution; wherein the metal ions in the mixed metal salt solution comprise strontium ions and yttrium ions, The strontium comprises one or more of 84 Sr、 86 Sr、 87 Sr、 88 Sr、 89 Sr and 90 Sr, Yttrium comprises one or more of 89 Y、 90 Y and 86 Y.
  6. 6. The application of the ionic liquid-liquid phase separation system according to claim 5, wherein the mass concentration ratio of the strontium ions to the yttrium ions in the mixed metal salt solution is (1-5000): 1.
  7. 7. The use of the ionic liquid-liquid phase separation system according to claim 5 or 6, wherein the mass concentration of the strontium ions in the mixed metal salt solution is1 mg/L-100000 mg/L, and/or, The mass concentration of the yttrium ions is 1 mg/L-100 mg/L.
  8. 8. The use of an ionic liquid-liquid phase separation system according to any one of claims 5-7 for separating strontium and yttrium, wherein the pH of the mixed solution is 6.5-9.
  9. 9. The use of an ionic liquid-liquid phase separation system according to any one of claims 5 to 8 for separating strontium and yttrium, wherein the original pH value of the mixed metal salt solution is 6 or less.
  10. 10. The application of the ionic liquid-liquid phase separation system according to any one of claims 5-8 in separating strontium and yttrium, wherein the method for separating strontium and yttrium comprises the following steps: Mixing an anionic surfactant, an organic base, a mixed metal salt solution with a pH value of below 6 and a pH regulator at a temperature of 5-55 ℃ to obtain a mixed solution with a pH value of 6.5-9, wherein the mass volume ratio of the mixture of the anionic surfactant and the organic base to the mixed metal salt solution is 0.1-0.5 g/mL, metal ions in the mixed metal salt solution comprise strontium ions and yttrium ions, strontium comprises 90 Sr, and yttrium comprises 90 Y.

Description

Ionic liquid-liquid phase separation system and application thereof in separating strontium and yttrium Technical Field The application relates to the technical field of separation, in particular to an ionic liquid-liquid phase separation system and application thereof in separating strontium and yttrium. Background Strontium-90 (90 Sr) is one of the main fission products in high level waste liquid, and has obvious biotoxicity and environmental migration capability. The decay daughter yttrium-90 (90 Y) is a pure beta - emitter, the maximum beta ray energy reaches 2.28 and MeV, and the method has extremely important application value in the nuclear medicine fields of cancer radioimmunotherapy, radiation embolism therapy and the like. Isolation of 90 Y in high purity from 90 Sr ("cow" technology) is a key step to achieve a continuous stable supply of 90 Y. Currently, common techniques for strontium yttrium separation include precipitation, extraction chromatography, solvent extraction, and the like. The precipitation method has the advantages of simple process, complicated steps, limited yield and easy introduction of impurities, and the extraction chromatography can reduce the dosage of organic solvents by fixing the extractant on a solid phase carrier, but has the problems of high resin preparation cost, poor irradiation stability, reduced column efficiency, complex leaching process and the like. The solvent extraction method is one of the most mature strontium-yttrium separation processes at present, and typical extractants comprise di- (2-ethylhexyl) phosphoric acid (HDEHP), crown ethers, phosphonate compounds and the like. The method realizes separation by means of different affinities of metal ions between an organic phase and a water phase, and has a higher separation coefficient. However, the technology must use a large amount of volatile organic solvents (such as n-dodecane, kerosene, xylene and the like) as diluents, so that safety risks such as fire and explosion exist, secondary organic wastes are generated by solvent volatilization and irradiation degradation, the treatment cost of radioactive organic waste liquid is increased, and adverse effects are caused on the environment and operation safety. Disclosure of Invention The application provides an ionic liquid-liquid phase separation system and application thereof in separating strontium and yttrium, which can efficiently and environmentally-friendly realize the separation of strontium and yttrium. The technical scheme of the application is realized as follows: The first aspect of the application firstly provides an ionic liquid-liquid phase separation system, which comprises an anionic surfactant and an organic base, wherein the octanol-water partition coefficient (log P) of the anionic surfactant is greater than or equal to 1.0. In some embodiments, the organic base comprises one or more of dodecylprimary amine, benzylamine, n-octylamine, and diphenylethylenediamine. In some embodiments, the anionic surfactant comprises one or more of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, sodium dodecyl sulfonate, sodium stearate, and sodium phosphatidate. In some embodiments, the molar ratio of the anionic surfactant to the organic base is 1 (0.5-2). The second aspect of the application provides an application of the ionic liquid-liquid phase separation system in separating strontium and yttrium, which comprises the step of mixing an anionic surfactant, organic base and mixed metal salt solution to obtain a mixed solution, wherein metal ions in the mixed metal salt solution comprise strontium ions and yttrium ions, strontium comprises one or more of 84Sr、86Sr、87Sr、88Sr、89 Sr and 90 Sr, and yttrium comprises one or more of 89Y、90 Y and 86 Y. In some embodiments, the mass concentration ratio of the strontium ions to the yttrium ions in the mixed metal salt solution is (1-5000): 1. In some embodiments, the mass concentration of the strontium ions in the mixed metal salt solution is 1mg/L to 100000mg/L, and/or the mass concentration of the yttrium ions is 1mg/L to 100mg/L. In some embodiments, the pH of the mixed solution is 6.5-9. In some embodiments, the mixed metal salt solution has an initial pH of 6 or less. In some embodiments, the method for separating strontium and yttrium comprises the steps of mixing an anionic surfactant, an organic base, a mixed metal salt solution with a pH value of less than 6 and a pH regulator at a temperature of 5-55 ℃ to obtain a mixed solution with a pH value of 6.5-9, wherein the mass-volume ratio of the mixture of the anionic surfactant and the organic base to the mixed metal salt solution is 0.1-0.5 g/mL, metal ions in the mixed metal salt solution comprise strontium ions and yttrium ions, strontium comprises 90 Sr, and yttrium comprises 90 Y. The application has the following beneficial effects: The application provides an ionic liquid-liquid phase separation system and application thereof in separating