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Method for extracting and separating thorium ions by using ion liquid extraction-supercritical CO2 reverse extraction technology

A technology of ionic liquid and thorium ion, which is applied in the field of nuclear fuel cycle to achieve the effect of improving extraction capacity, broad application prospect and avoiding pollution

Inactive Publication Date: 2013-04-17
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, combining the ionic liquid extraction system with sc-CO 2 The combination of back-extraction technology to realize the extraction and back-extraction of thorium ions from the aqueous phase has not been reported yet.

Method used

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  • Method for extracting and separating thorium ions by using ion liquid extraction-supercritical CO2 reverse extraction technology
  • Method for extracting and separating thorium ions by using ion liquid extraction-supercritical CO2 reverse extraction technology
  • Method for extracting and separating thorium ions by using ion liquid extraction-supercritical CO2 reverse extraction technology

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Experimental program
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Effect test

Embodiment l

[0028] Embodiment 1, ionic liquid extracts thorium ion

[0029] When carrying out the extraction experiment, take 0.5ml of ionic liquid containing a certain amount of CMPO (purchased from STREM, USA, product number: 15-3500) and 0.5ml of an aqueous phase containing a certain amount of thorium ions or an aqueous phase containing thorium ions and other ions After shaking for at least 2 hours, the phases were separated by centrifugation, and the upper aqueous phase was taken to analyze the concentration of thorium ions (arsenazo III method or inductively coupled plasma atomic emission spectrometry ICP-AES), and the concentration of thorium ions extracted into the ionic liquid phase was determined by subtraction method Obtained, thus obtain the extraction rate E or distribution ratio D.

[0030]CMPO is used as an extractant to extract thorium ions in the aqueous phase: C containing 0.006mol / L CMPO 2 mimNTf 2 It can quantitatively extract 0.002 mol / L thorium ions from the aqueous...

Embodiment 2

[0034] Embodiment 2, supercritical CO 2 Stripping CMPO / C n mimNTf 2 -Th 4+ Thorium ions in the system

[0035] In the stripping experiment, centrifuge the Th-enriched ionic liquid phase from the water phase, take the ionic liquid phase and place it in a supercritical extraction kettle, set the temperature and pressure of the reaction, select the dynamic extraction mode, and add the corresponding entrainer conduct experiment. After the stripping was completed, the ionic liquid sample was taken for microwave digestion, and the concentration of residual metal ions was measured by ICP-AES. The stripping efficiency was obtained by subtraction method from the known total concentration of metal ions in the ionic liquid phase.

[0036] Supercritical CO 2 Stripping CMPO / C n mimNTf 2 / Th 4+ The invention of the system: with CMPO / C 2 mimNTf 2 / Th 4+ Take the system as an example, under the conditions of 200atm and 40°C, TOPO / acetonitrile solution is selected as the entrainer. ...

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Abstract

The invention discloses a method for efficiently extracting thorium ions from water phase and efficiently reversely extracting the thorium ions from ion liquid phase by combining with the ion liquid extraction-supercritical CO2 reverse extraction technology. The method adopts ion liquid as thinner and adopts CMPO as extraction agent to efficiently extract out the thorium ions from water solution, and the extraction distribution ratio is up to more than 103; then from an ion liquid system loaded with the thorium ions, the efficient reverse extraction of the thorium ions in different ion liquid extraction systems with acetonitrile solution of TRPO as entrainer by using the supercritical CO2 extraction technology, and the reverse extraction efficiency can be up to more than 99 percent. The method adopts the ion liquid as the thinner, so that the extraction capacity of the system to the thorium ions can be largely improved. sc-CO2 is used as the thinner in the reverse reaction process, so that the loss of the ion liquid in the reverse extraction process can be furthest reduced, the pollution to the ion liquid is avoided, and the reverse extraction efficiency is improved.

Description

technical field [0001] The invention belongs to the field of nuclear fuel cycle, in particular to a method for extracting supercritical CO by using ionic liquid 2 Back extraction technology is a method of extracting and separating thorium ions from the aqueous phase. Background technique [0002] Thorium is one of the most important nuclear fuels in current nuclear energy utilization, and its mining, extraction, and separation are of great significance to the further sustainable development of nuclear energy. [0003] The research on thorium mainly involves two aspects: one is the extraction of thorium elements from associated rare earth minerals (front-end treatment); the other is the separation of uranium and thorium elements (back-end treatment in the thorium-uranium cycle). Liquid-liquid solvent extraction is an effective method for extracting and separating metal ions, but the extraction process requires the use of a large amount of flammable and toxic organic solvents...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B60/02C22B3/38C22B3/40
CPCY02P10/20
Inventor 沈兴海付婧陈庆德
Owner PEKING UNIV
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