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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AI-Extracted Technical Summary

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...

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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.

Application Domain

Flotation

Technology Topic

SolventIon +12

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Examples

Experimental program(5)

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) (1mL) as an interlayer phase, and vortex to make the two phases Or evenly mix the three phases.

[0063] The third step: stand still or centrifuge at low speed to separate the two phases.

[0064] Fourth step: Take out the upper first organic phase (kerosene phase) separated in the third step, centrifuge at high speed, take the clear liquid and add it to the second step as the first organic phase for repeated use, and repeat this multiple times operating.

[0065] Step 5: Centrifuge the second organic phase separated in Step 3 at high speed, and measure the XRF of the solid collected in the separation. The result is as follows figure 2 Shown; the obtained clarified second organic phase is reused in the first step, and the operation can be repeated many times.

[0066] figure 2 The results of 6-cycle series separation are given in the article. XRF detects the content of neodymium oxide in the raw material. From figure 2 It can be seen that for the first cycle, the Nd 2 O 3 The removal rate of 54%, after three cycles, the Nd 2 O 3 The removal rate of 87%, after six cycles, the Nd 2 O 3 The removal rate reached 96%. It can be seen that the method of the present invention has a high removal rate of rare earth elements in spent fuel.

[0067] The distribution of the substances between the two organic phases before and after the phase separation in the third step is as follows: Figure 4 with Figure 5 Shown. Among them, the lower black powder is uranium oxide (U 3 O 8 ); Figure 5 The powder in the middle and upper part (white-blue powder) is neodymium oxide (Nd is used as the representative element of fission rare earth elements in spent fuel).

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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Promote environmental protection
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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

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Examples

Example Embodiment

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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