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Magnetic particle extractive agent and method for isolating radionuclide

A technology of radionuclide and magnetic particles, which is applied in the field of radioactive waste liquid treatment, can solve problems such as affecting application, instability, and difficult desorption, and achieve continuous large-scale separation, easy desorption, and high selectivity.

Inactive Publication Date: 2008-07-30
NAT INST FOR RADIOLOGICAL PROTECTION & NUCLEAR SAFETY CHINESE CENT FOR DISEASE CONTROL & PREVENTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in these studies, the extractant is physically adsorbed on the surface of the magnetic particles, which is unstable, which makes the magnetic separation efficiency low, desorption is difficult, and it is difficult to realize the reuse of magnetic particles, which affects its application.

Method used

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  • Magnetic particle extractive agent and method for isolating radionuclide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1, Magnetic Fe 3 o 4 Gel preparation

[0039] Weigh 8.6 g FeCl 2 and 23.6 g FeCl 3 , dissolved in 500ml of water, heated to 80°C, passed nitrogen into the container, poured 25ml of 25% ammonia water into the aqueous solution, and immediately started dripping oleic acid at a rate of 0.5ml / min until the aqueous solution became clear. Continue to keep the temperature for 1 hour, separate it with a magnet, and wash it repeatedly with deionized water to obtain a black agglomerate magnetic Fe 3 o 4 gel. The transmission electron microscope test showed that the average size of the particles was 8 nanometers.

Embodiment 2

[0040] Embodiment 2, the preparation of magnetic polymer particles

[0041] Get 20 grams of magnetic Fe prepared by embodiment 1 3 o 4 For the gel, add 150ml of methyl acrylate and 10ml of divinylbenzene crosslinking agent to the organic phase, stir to form an oil phase magnetic colloid; add 10 grams of polyvinyl alcohol emulsifier to 500ml of deionized water, and stir at 50°C Prepare the water phase in 60 minutes; mix the water phase and the oil phase to obtain an oil-in-water emulsion system, add 4 grams of oil-soluble initiator benzoyl peroxide, and stir at 80 ° C for 6 hours to carry out polymerization reaction to obtain magnetic polymethyl acrylate Ester pellets. The magnetic nano-Fe in the magnetic polymethyl acrylate particles 3 o 4 Granules make up about 10%.

[0042] It should be noted that the preparation of crosslinked polymers is not limited to the crosslinking of methyl acrylate and divinylbenzene, but other acrylic esters and vinylbenzene polymers can be sel...

Embodiment 3

[0044] Embodiment 3, the immobilization and radionuclide of magnetic particle extractant (nanometer magnetic microsphere-polymer-dibenzo-18-crown 6) 90 Separation of Sr

[0045] (1) Immobilization of crown ethers on the surface of magnetic particles

[0046] Mix 5 grams of magnetic polymethyl acrylate particles prepared in Example 2 with 150 ml of ethylenediamine, and stir and react at a constant temperature of 50°C for 0.5 hours. During this process, amine groups are formed on the surface of the magnetic polymethyl acrylate particles; Dialdehyde, stirred and reacted at 50°C for about 4 hours, during which the amine groups on the surface of the magnetic polymethyl acrylate particles were converted into aldehyde groups; finally, 1 gram of 4-aminodibenzo-18-crown 6 was added, and stirred at 50°C for about 4 hours. After 4 hours, the magnetic particle extractant containing dibenzo-18-crown 6 on the surface was obtained, wherein the crown ether concentration was 0.5 mmol / g. Acco...

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Abstract

The invention discloses finished magnetic-particle extractant combined with magnetic nanometer microspheres, a preparation method thereof and application thereof in separation of radioactive species. The extractant consists of magnetic fine particles carrying separated functional groups of radioactive species. Nanometer particles of magnetism Fe3O4 are dispersed inside a polymer. A layer of ingredients selected from crown ether and ramification thereof or neutral phosphorus (TBP, TOPO) ramification and tertiary amine (TOA) ramification connected with chemical bonds is arranged on the surface of the polymer. The magnetic particle extractant can be directly added to solution containing radioactive species, and is stirred at a room temperature. The magnetic extractant is separated out with the applied magnetic field to separate radioactive species. The invention is integrated with the advantages of simple operation of magnetic separation and high selectivity of extraction separation, and can separate target radioactive species out from complicated radioactive liquid waste containing one or a plurality of kinds of <90>Sr and actinide elements. The magnetic-particles can be desorbed easily, and can be used repeatedly without producing secondary waste. In addition, by adopting the invention, continuous large-scale separation can be completed.

Description

Technical field: [0001] The invention relates to the field of radioactive waste liquid treatment, in particular to a magnetic particle extractant combined with nanometer magnetic particles and having a special effect on separating radionuclides, a preparation method and application thereof. Background technique: [0002] The treatment and disposal of radioactive waste is one of the important measures to ensure the safety of the public and the environment and the sustainable development of nuclear energy. The separation of radioactive waste liquid is an important part of radioactive waste treatment. The developed processes include: American TRUEX process, Japanese DIDPA process, French DIAMEX process and Russian RT-2 plant full separation process, etc. Tsinghua University has developed the TRPO process for the separation of high-level radioactive waste liquid, and the China Institute of Atomic Energy has also developed the CMP process and pod ether process. All of these proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/04H01F1/42C08L33/08C08K3/22B01D11/04
Inventor 吉艳琴李金英苏旭
Owner NAT INST FOR RADIOLOGICAL PROTECTION & NUCLEAR SAFETY CHINESE CENT FOR DISEASE CONTROL & PREVENTION
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