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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

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 through hydrometallurgical recovery technology, but such a separation process will produce a large amount of acid leaching high-level waste liquid, and it is also necessary to provide strict conditions for Pu conversion. Protective measures

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

Experimental program
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Effect test

Embodiment 1

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

[0059] Select kerosene as the basic solvent phase of the first organic phase, add 100mg / mLCA-12 and PC-88a (rare earth recognition capture reagent and mixed dispersant, the ratio of the two is 1:10) to the kerosene and mix thoroughly to obtain first organic phase;

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

[0061] The first step: 300mg simulated spent fuel (mainly composed of U 3 o 8 , where Nd 2 o 3 The content is 16.83%wt)) into 2mL of the above-mentioned second organic phase, and ultrasonically dispersed, so that the spent fuel is uniformly dispersed in the second organic phase.

[0062] The second step: the second organic phase obtained in the first step is directly mixed with the first organic phase (4mL), or a third phase (such a...

Embodiment 2

[0069] Adopt the method identical with embodiment 1, just change kerosene into monounsaturated Omega-9 fatty acid (being called for short oleic acid), the result obtained is substantially the same as that of embodiment 1, specifically see image 3 .

Embodiment 3

[0071] Using the same method of operation as in Example 1, it has been verified that U 3 o 8 All solid state separation of La 2 o 3 Effect. In the first phase, oleic acid or sulfonated kerosene was added with 125 mg / mL of P507 and CA-12, and in the second phase, 1:1 [C 4 mim][Tf 2 N] and [C 4 mim][PF 6 ]. U before separation 3 o 8 Middle La 2 o 3 The content of La 2 o 3 The content of La 2 o 3 content down 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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