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Method for separating heating element Sr and metal element Ba from high-level waste

A technology of metal elements and elements, which is applied in the field of post-treatment of high-level radioactive waste in the nuclear industry, can solve the problems of slow adsorption rate, processing cost, increase of secondary waste, difficulty in achieving effective separation of Cs, etc., and achieve good separation effect and selective adsorption strong effect

Inactive Publication Date: 2008-12-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to reduce the H in strongly acidic solution + Cs adsorption is seriously hindered by competitive adsorption. Neutralization and denitrification are essential pretreatments, resulting in a significant increase in treatment costs and secondary waste, and its slow adsorption rate makes it difficult to achieve effective separation of Cs.

Method used

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  • Method for separating heating element Sr and metal element Ba from high-level waste
  • Method for separating heating element Sr and metal element Ba from high-level waste
  • Method for separating heating element Sr and metal element Ba from high-level waste

Examples

Experimental program
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Effect test

Embodiment 1

[0033] The preparation of embodiment 1 adsorbent

[0034] Dissolve 100 grams of TOOD in 500 mL of dichloromethane and mix well; add 200 grams of polymer-coated macroporous SiO 2 (SiO 2 -P) Stir evenly to volatilize most of the dichloromethane until the material is in a nearly dry state, and then vacuum-dry the nearly dry material at 45° C. for 24 hours.

Embodiment 2

[0035] The preparation of embodiment 2 adsorbents

[0036] Dissolve 100 grams of TOOD in 2000 mL of dichloromethane and mix well; add 1000 grams of polymer-coated macroporous SiO 2 (SiO 2 -P) Stir evenly to volatilize most of the dichloromethane until the material is in a nearly dry state, and then vacuum-dry the nearly dry material at 45° C. for 24 hours.

Embodiment 3

[0037] The preparation of embodiment 3 adsorbent

[0038] Dissolve 100 grams of TOOD in 3000 mL of dichloromethane and mix well; add 1500 grams of polymer-coated macroporous SiO 2 (SiO 2 -P) Stir evenly to volatilize most of the dichloromethane until the material is in a nearly dry state, and then vacuum-dry the nearly dry material at 45° C. for 24 hours.

[0039] Separation of heating element Sr and black metal element Ba in high-level radioactive waste

[0040] The adsorbent prepared in Example 1 was filled into a chromatographic column, and the chromatographic column was a glass tube with an inner diameter of 1 cm, an outer diameter of 1.2 cm, and a height of 30 cm.

[0041] The mobile phase flow rate is typically 1.0 mL / min.

[0042] (1) According to the flow process disclosed by the Chinese invention patent application whose document number is CN101143273, the high-level waste is made into a nitrate solution to separate the exothermic elements Cs and Sr, and the chroma...

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Abstract

The invention discloses a method for separating a heating element of Sr and a metallic element of Ba from high-level wastes, comprising the following steps: (1) the concentration of nitric acid in a nitrate solution containing the heating element of Sr and the metallic element of Ba is adjusted to 0.5 to 4 mol / L; (2) after adjusting the concentration of nitric acid, the nitrate solution flows through a chromatographic column filled with a sorbent; the heating element of Sr is adsorbed by the filled sorbent while the metallic element of Ba flows out; (3) chromatographic column adsorbing the heating element of Sr is washed by deionized water and the heating element of Sr is washed out in a form of nitrate. The method of the invention has the advantages of good separation effect, strong preferential adsorption of the sorbent and being capable of separating the heating element of Sr and the metallic element of Ba from the high-level wastes thoroughly.

Description

technical field [0001] The invention relates to the field of reprocessing of high-level radioactive waste in nuclear industry, especially the separation of heating element Sr and metal element Ba in high-level radioactive waste. Background technique [0002] As the high-level radioactive waste (HLLW) produced by spent fuel (SF) reprocessing, its safe treatment and disposal is one of the key links in nuclear fuel cycle technology. According to the national atomic energy development policy, rational and effective use of limited nuclear resources, ensuring safety, nuclear non-proliferation, environmental adaptability, economy, and effective disposal of HLLW through spent fuel reprocessing technology are its basic guidelines. [0003] Spent fuel contains fragmentation products (FP) such as exothermic elements and long-lived (millions of years) minor actinides (MA). and almost all FP elements went into HLLW. For long-lived MA, separation / transmutation technology has been propos...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/24
CPCY02P10/20
Inventor 张安运
Owner ZHEJIANG UNIV
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