New method for removing rare earth element in spent fuel

A spent fuel and organic phase technology, applied in solid separation, flotation, etc., can solve the problems of acid leaching high-level waste liquid, reducing the thermal conductivity of uranium dioxide, etc., and achieve high economic benefits, reduced risks, and low costs Effect

Active Publication Date: 2015-12-30
INST OF MODERN PHYSICS CHINESE ACADEMY OF SCI +1
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Problems solved by technology

In addition, the presence of rare earth elements will reduce the thermal conductivity of uranium dioxide
At present, the rare earth elements are generally removed from the spent fuel by acid leaching series liquid-liquid extraction throu

Method used

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  • New method for removing rare earth element in spent fuel
  • New method for removing rare earth element in spent fuel
  • New method for removing rare earth element in spent fuel

Examples

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Example Embodiment

[0057] Example 1

[0058] Prepare the ionic liquid-containing two-phase organic flotation separation system of the present invention:

[0059] Choose kerosene as the basic solvent phase of the first organic phase, add 100mg / mL CA-12 and PC-88a (rare earth identification capture reagent and mixed dispersant, the ratio of the two is 1:10) into the kerosene and mix it fully. First organic phase

[0060] Will [C n mim][Tf 2 N] (n is 4) and [C n Py][PF 6 ] (n is 4) Mix thoroughly at a volume ratio of 1:1 (mL:mL) to obtain a second organic phase.

[0061] Step 1: Put 300mg of simulated spent fuel (mainly composed of U 3 O 8 , Where Nd 2 O 3 The content is 16.83%wt)) added to 2mL of the above-mentioned second organic phase, ultrasonically dispersed, so as to uniformly disperse the spent fuel into the second organic phase.

[0062] The second step: directly mix the second organic phase obtained in the first step with the first organic phase (4mL), or further add a third phase (such as water) (...

Example Embodiment

[0068] Example 2

[0069] Using the same method as in Example 1, except that kerosene was replaced by monounsaturated Omega-9 fatty acid (oleic acid for short), the results obtained were basically the same as those in Example 1. See details image 3 .

Example Embodiment

[0070] Example 3

[0071] Using the same operating method as in Example 1, it was verified that U 3 O 8 Mid-to-solid separation La 2 O 3 Effect. The first phase is oleic acid or sulfonated kerosene with 125mg / mL P507 and CA-12, the second phase is 1:1 [C 4 mim][Tf 2 N] and [C 4 mim][PF 6 ]. Before separation U 3 O 8 Middle La 2 O 3 The content of 4.25%, using the method of the present invention, after 3 closed loop separation, La 2 O 3 The content of La is reduced to 2.41%. After 6 closed loop separation, La 2 O 3 The content is reduced to 1.95%.

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Abstract

The invention provides an ionic-liquid-containing dual-organic-phase flotation separation system and a method for removing rare earth elements in spent fuel. The system comprises a first organic phase (also called as an upper layer phase or phase 1) which comprises a basic solvent phase consisting of one or a plurality of the following substances: multi-chain organic alkane solvent, organic ester solvent, oleic acid fatty acid solvent and naphthenic acid solvent; a second organic phase (also called as a lower layer phase or phase 2) which is a composite phase of first type ionic liquid and second type ionic liquid, wherein the first type ionic liquid is imidazole ionic liquid and the second type ionic liquid is selected from pyridine, pyrrole, tertiary ammonium or other functionalized ionic liquid. Through a multistage tandem differential flotation process, the direct all-solid separation of rare earth elements from spent fuel can be effectively realized.

Description

technical field [0001] The invention belongs to the technical field of rare earth separation, in particular to a new method for all solid-state separation of lanthanum actinide phases, which is used for effectively removing neutron poison rare earth elements in spent fuel. Background technique [0002] There are some rare earth elements in spent fuel, such as La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, etc., which are called neutron poisons, because these rare earth elements have large neutron cross-sections and are strong neutralizers. Neutron absorbers contribute significantly (approximately 50%) to the neutron accumulation of spent fuel. In addition, the presence of rare earth elements will reduce the thermal conductivity of uranium dioxide. At present, the rare earth elements are generally removed from spent fuel by acid leaching series liquid-liquid extraction through hydrometallurgical recovery technology, but this separation process will produce a large amount of acid leaching h...

Claims

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Application Information

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IPC IPC(8): B03D1/00
Inventor 杨帆范芳丽秦芝
Owner INST OF MODERN PHYSICS CHINESE ACADEMY OF SCI
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