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Method for extracting and separating uranyl ions from water phase containing zirconium ions and lanthanide ions

A technology for separating uranyl ions and uranyl ions, which is applied in the field of nuclear fuel cycle, can solve problems such as difficult separation of zirconium ions, achieve high selective extraction performance, improve extraction capacity, and wide range of aqueous acidity

Inactive Publication Date: 2012-11-14
PEKING UNIV
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Problems solved by technology

In traditional organic solvent extraction systems (such as the Purex process), it is difficult to separate zirconium ions from uranyl ions; Selective extraction separation still needs to be studied
At the same time, since CMPO has a good extraction efficiency for lanthanide ions in traditional organic solvents, the extraction and separation of uranyl ions and lanthanide ions in ionic liquid systems cannot be obtained by analogy with existing technologies, and it also needs to be carried out. Research

Method used

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  • Method for extracting and separating uranyl ions from water phase containing zirconium ions and lanthanide ions
  • Method for extracting and separating uranyl ions from water phase containing zirconium ions and lanthanide ions
  • Method for extracting and separating uranyl ions from water phase containing zirconium ions and lanthanide ions

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Embodiment 1

[0018] Embodiment 1, extract UO from aqueous phase 2 2+

[0019] When performing extraction experiments, take 0.5mL of ionic liquid containing a certain amount of CMPO and 0.5mL of an aqueous phase containing a certain amount of uranyl ions, zirconium ions (lanthanide ions) and a certain amount of nitric acid, mix thoroughly, then shake for 30min, and centrifuge to separate the phases Then take the upper water phase to analyze the concentration of uranyl ions, zirconium ions, and lanthanide ions (ICP-AES). or distribution ratio D.

[0020] When different ionic liquids containing 0.02mol / L CMPO extract 0.01mol / L uranyl ions in the presence of 0.01mol / L zirconium ions, the extraction rate varies with the concentration of nitric acid in the aqueous phase, as figure 1 shown. for C 2 mimNTf 2 system, increasing the concentration of nitric acid in the aqueous phase slightly decreased the extraction rate of uranyl ions as a whole. for C 4 mimNTf 2 、C 6 mimNTf 2 、C 8 mimNT...

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Abstract

The invention discloses a method for extracting and separating uranyl ions from a water phase containing zirconium ions and lanthanide ions. The method taking a hydrophobic ionic liquid as a diluent and taking octyl (phenyl)-N, N-diisobutyl carbonoyl methyl-phosphine oxide (CMPO) as an extracting agent comprises the following steps of: extracting and separating out the uranyl ions efficiently from the water phase containing the zirconium ion and / or the lanthanide ions, wherein the zirconium ions and the lanthanide ions are not extracted or are low in extracted ratio. The method is suitable for a large water phase acid degree range, and the uranyl ions can be selectively extracted from the moderate condition to 4mol / L of HNO3. The ion liquid nearly has volatility, and the using process is environment-friendly. The method provided by the invention has wide application prospect in the field of nuclear fuel cycle.

Description

technical field [0001] The invention relates to the field of nuclear fuel cycle, in particular to a method for extracting and separating uranyl ions from an aqueous phase containing zirconium ions and lanthanide ions. Background technique [0002] Uranium is currently the most important nuclear fuel in nuclear energy utilization, and its mining, extraction, and separation are of great significance to the sustainable development of nuclear energy. Currently, solvent extraction is an indispensable means for the separation and purification of uranium in the nuclear fuel cycle. Various liquid-liquid extraction processes for uranium have been developed, such as the Purex process. However, these liquid-liquid extraction processes will use certain volatile organic solvents such as kerosene, and the single extraction efficiency is not very high, and in the extraction process, other metal ions such as zirconium are difficult to combine with uranyl ions. Separation usually requires ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/38C22B60/02
CPCY02P10/20
Inventor 沈兴海孙涛祥陈庆德
Owner PEKING UNIV
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