Method for enriching uranium and thorium from water phase by using cloud point extraction technology

A technology for extracting uranyl ions in an aqueous phase, applied in the field of enriching uranium and thorium, can solve the problems of poor effect, no effect, and limited cloud point extraction application, and achieve high-efficiency extraction performance and good application prospects

Inactive Publication Date: 2013-04-17
PEKING UNIV
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  • Application Information

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Problems solved by technology

Acidic extractants such as dibenzoyl (DBM) and 1-(pyridylazo)-2-naphthol (PAN) are also used for cloud point extraction of UO 2 2+ 、Th 4+ Medium, but there is basically no effect under acidic conditions
In practical applications, such as nuclear fuel reprocessing, the acidity of the solution is often at a high

Method used

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  • Method for enriching uranium and thorium from water phase by using cloud point extraction technology
  • Method for enriching uranium and thorium from water phase by using cloud point extraction technology
  • Method for enriching uranium and thorium from water phase by using cloud point extraction technology

Examples

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Example Embodiment

[0022] Example 1. UO is extracted from the water phase using cloud point extraction 2 2+ Or Th 4+

[0023] In the extraction experiment, the quantitative surfactant TX-114, the extraction agent TOPO, ionic liquid, uranyl ion (UO 2 2+ ) Or thorium ion (Th 4+ ) Solution and NaNO 3 Solution, distilled water three times to make up to 10mL. After shaking, keep the temperature at 70°C for 2h, centrifuge while hot, and analyze the U(VI) or Th(IV) concentration of the upper water phase (determination method: ICP-AES or inductively coupled plasma emission spectroscopy). The concentration of U(VI) or Th(IV) extracted into the surfactant phase is determined by the difference subtraction method, thereby obtaining the extraction rate E.

[0024] Without additional acid and the concentration of TX-114 in the aqueous solution is 0.01mol / L, the concentration of TOPO is 0.0005mol / L, NaNO 3 Under the condition of the concentration of 0.1mol / L, do not add or add different C n mimNTf 2 Ionic liquids f...

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Abstract

The invention discloses a method for enriching U (VI) or Th (IV) from a water phase by using cloud point extraction. The method adopts trialkyl phosphine oxide as extraction agent, TX-114 as surfactant and CnmimNTf2 hydrophobic ion liquid as additive to efficiently extract and separate out UO22+ or Th4+ from water solution under different conditions, wherein the water solution contains uranyl ions or thorium ions; and the ion strength of an extraction system is greater than or equal to 0.05 mol/L. The acidity range of the water phase adaptive to the method is large, so that the uranium and thorium ions can be remarkably extracted from the neutral condition to 2 mol/L HNO3. The cloud point extraction process is environment-friendly; and the method has wide prospects in the fields, such as uranyl enrichment and detection and the like.

Description

technical field [0001] The invention belongs to the field of nuclear fuel cycle, in particular to a method for enriching uranium and thorium from water phase by cloud point extraction. Background technique [0002] Uranium is the most important nuclear fuel in nuclear energy utilization at present, and thorium is a potential resource for nuclear energy utilization. At the same time, both are biologically pathogenic. Based on the application prospect and toxicity of uranium and thorium, it is very important to effectively enrich, separate and detect uranium and thorium in environmental and biological samples. [0003] Cloud point extraction (CPE) technology is a new type of separation and enrichment technology developed in recent years. It mainly uses the solubilization and phase separation of non-ionic surfactant solution to achieve the enrichment and separation of solutes. For non-ionic surfactant solutions, when the temperature is higher than a certain value, the solutio...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B60/02
CPCY02P10/20
Inventor 沈兴海高嵩孙涛祥陈庆德
Owner PEKING UNIV
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