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Method for separating trivalent actinide and lanthanide ions based on synergistic effect

A synergistic effect and actinide technology, applied in nuclear engineering, radioactive purification, etc., can solve the problems of insufficient attention to the regulation of the trivalent lanthanum actinium ion species, and achieve the effects of expanding applicability, improving stability, and good application prospects

Active Publication Date: 2018-04-24
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In addition, in the research on the separation of trivalent lanthanum actinide from dithiophosphinic acid, the current research focuses on the regulation of dithiophosphinic acid species in the organic phase (concentration, saponification degree, etc.), while for the aqueous phase Insufficient attention has been paid to the regulation of the species state of trivalent lanthanum actinide ions in

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Use bis(2,4,4-trimethylpentyl)dithiophosphinic acid as the extractant, and dilute with kerosene (an alkane mixture) to form an organic phase. The concentration of the extractant in the organic phase is 0.5mol / L, extraction reaction occurs with the water phase, the water phase is added with formic acid and tracer 241 Am and 151,152 The pH of Eu is 3.7 acidic aqueous solution, the concentration of formic acid in the water phase is 0.05mol / L; the volume ratio of the organic phase and the water phase is 1, the two phases are mixed and stirred for 5 minutes, centrifuged, and the Am and the organic phase and the water phase are measured. Eu content, the extraction rate of Am is 82%, the extraction rate of Eu is less than 0.05%, and the pH change of raffinate is less than 0.04.

Embodiment 2

[0026] Two (o-trifluoromethylphenyl) dithiophosphinic acid is used as the extractant, and diluted with toluene to form an organic phase, the concentration of the extractant in the organic phase is 0.3mol / L, and an extraction reaction occurs with the aqueous phase, The aqueous phase is supplemented with acetic acid and tracer 241 Am and 151,152 Eu and 2mmol / L Eu 3+ and Nd 3+ The pH is 2.5 acidic aqueous solution, the concentration of acetic acid in the water phase is 0.02mol / L, the volume ratio of the organic phase and the water phase is 0.4, the two phases are mixed and stirred for 5 minutes, centrifuged, and the Am and Eu in the organic phase and the water phase are measured , Nd content, the extraction rate of Am is 85%, the extraction rate of Eu is less than 0.2%, the extraction rate of Nd is less than 1%, and the pH change of raffinate is <0.02.

Embodiment 3

[0028] Use butyl octyl dithiophosphinic acid as the extractant, and dilute it with n-dodecane to form an organic phase. The concentration of the extractant in the organic phase is 0.75mol / L, and an extraction reaction occurs with the water phase, and the water phase is added Has lactic acid and tracer 241 Am and 151, 152 The pH of Eu is 3.2 acidic aqueous solution, the concentration of lactic acid in the water phase is 0.01mol / L; the volume ratio of the organic phase and the water phase is 2, the two phases are mixed and stirred for 5 minutes, centrifuged, and the Am, Eu content, the extraction rate of Am is 88%, the extraction rate of Eu is less than 0.2%, and the pH change of raffinate is <0.03.

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Abstract

The invention discloses a method for separating trivalent actinide and lanthanide ions based on the synergistic effect. Fat-soluble dithiophosphiic acid is used as an extracting agent and is diluted with a diluent to form an organic phase, and the organic phase and an aqueous phase are subjected to an extraction reaction, wherein the aqueous phase is an acidic aqueous solution containing the trivalent actinide and lanthanide ions, and a water-soluble organic weak acid complexing agent is added into the acidic aqueous solution. The trivalent actinide and lanthanide ions are extracted through the synergistic effect of the extracting agent and the complexing agent, the volume ratio of the organic phase to the aqueous phase is 0.2-2, and the pH value of the acidic aqueous solution is 2-4. Themethod is good in separation performance, good in stability and easy and convenient to operate.

Description

technical field [0001] The invention belongs to the technical field of nuclear fuel cycle and radioactive waste liquid treatment, and specifically relates to a method for separating trivalent actinide and lanthanide ions based on a synergistic effect. Background technique [0002] A large amount of radioactive waste is generated during the nuclear fuel cycle. At present, both in the development of nuclear weapons and in the application of civilian nuclear energy, a large amount of high-level radioactive liquid waste is left behind, and it is imminent to properly solve the problem of its disposal. [0003] The "separation-transmutation" method is an advanced strategy for treating high-level waste liquid, that is, the chemical separation method is used to selectively separate the actinide elements, which account for a small proportion but are highly toxic, from the high-level waste liquid. Accelerators or reactors convert it into stable or short-lived nuclides, and the residu...

Claims

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Application Information

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IPC IPC(8): G21F9/06G21F9/12
CPCG21F9/06G21F9/125
Inventor 徐超孙涛祥陈靖
Owner TSINGHUA UNIV
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