Method for separating uranium from mixture of uranium dioxide and lanthanide oxide

A lanthanide, uranium dioxide technology, applied in electrodes, electrolysis process, electrolysis components, etc., can solve problems such as poor separation effect, and achieve the effect of simplifying the treatment process

Inactive Publication Date: 2018-05-15
INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the separation effect of LC

Method used

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  • Method for separating uranium from mixture of uranium dioxide and lanthanide oxide
  • Method for separating uranium from mixture of uranium dioxide and lanthanide oxide
  • Method for separating uranium from mixture of uranium dioxide and lanthanide oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Analytical pure anhydrous LiCl 50g, KCl 50g, mix well, dry and dehydrate and place in a corundum crucible.

[0042] (2) Put the corundum crucible with salt in (1) in a high-temperature resistance furnace, and the high-temperature resistance furnace is placed in a glove box. The glove box controls the water and oxygen content to be less than 1ppm, and then heats to 550°C and melts.

[0043] (3) Add 0.23g UO 2 powder and 0.5g La 2 o 3 At the same time, add to the molten salt in (2), then add 3.0gAlCl 3 , Bubbled high-purity Ar gas and stirred for 10 hours to make the reaction fully proceed.

[0044] (4) On the basis of (3), the graphite rod is used as the auxiliary electrode, the Ag / AgCl is used as the reference electrode, and the aluminum sheet electrode is used as the working electrode. A potential of -1.20V is applied to the working electrode to achieve constant potential separation. At the same time, the square wave voltammetry curve is scanned, and the degree...

Embodiment 2

[0048] (1) Analytical pure anhydrous LiCl 45g, KCl 55g, mix well, dry and dehydrate and place in a corundum crucible.

[0049] (2) Put the corundum crucible with salt in (1) in a high-temperature resistance furnace, and the high-temperature resistance furnace is placed in a glove box. The glove box controls the water and oxygen content to be less than 1ppm, and then heats to 500°C and melts.

[0050] (3) Add 0.3g UO 2 powder and 0.5g Nd 2 o 3 At the same time, add to the molten salt in (2), then add 3.0gAlCl 3 , Bubbled high-purity Ar gas and stirred for 10 hours to make the reaction fully proceed.

[0051] (4) On the basis of (3), the graphite rod is used as the auxiliary electrode, the Ag / AgCl is used as the reference electrode, and the aluminum sheet electrode is used as the working electrode. A potential of -1.25V is applied to the working electrode to achieve constant potential separation.

[0052] (5) Take out a small amount of salt in the separation process, and ana...

Embodiment 3

[0056] (1) Analytical pure anhydrous LiCl 44.8g KCl 55.2g, mix well, dry and dehydrate and place in a corundum crucible.

[0057] (2) Put the corundum crucible with salt in (1) in a high-temperature resistance furnace, and the high-temperature resistance furnace is placed in a glove box. The glove box controls the water and oxygen content to be less than 1ppm, and then heats to 550°C and melts.

[0058] (3) 2.18g UO 2 powder and 0.20g La 2 o 3 ,0.20g CeO 2 ,0.20g Sm 2 o 3 At the same time, add in the molten salt melted in (2), then add 6.0g AlCl 3 , Bubbled high-purity Ar gas and stirred for 10 hours to make the reaction fully proceed.

[0059] (4) On the basis of (3), the graphite rod is used as the auxiliary electrode, the Ag / AgCl is used as the reference electrode, and the aluminum sheet electrode is used as the working electrode. A potential of -1.22V is applied to the working electrode to achieve constant potential separation.

[0060] (5) Take out a small amount o...

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Abstract

The invention provides a method for separating uranium from a mixture of uranium dioxide and lanthanide oxide. The method for separating uranium from the mixture of the uranium dioxide and the lanthanide oxide comprises the operation steps that the mixture containing the uranium dioxide and the lanthanide oxide is added into a LiCl-KCl fused salt system, wherein the mixture accounts for 0.2%-5% ofthe fused salt system by mass; and then AlCl3 is added, the uranium dioxide and the lanthanide oxide are dissolved to form a corresponding chloride, an electrode is inserted into the fused salt system, current is applied to the electrode to recover uranium at the cathode in an alloy form, and the lanthanide oxide is still left in fused salt. According to the method, U and lanthanide in the mixture of the UO2 and the lanthanide oxide such as Ln2O3 can be directly separated through an electrochemical method, the process of reducing oxide into metal first and then conducting refining is omitted,and the dry aftertreatment process of oxide spent fuel is simplified.

Description

technical field [0001] The invention belongs to the technical field of molten salt electrolysis, and in particular relates to an electrolytic separation method for radioactive substances. Background technique [0002] For the future advanced nuclear fuel cycle system, dry reprocessing technology has obvious advantages. At present, molten salt electrolytic refining technology is considered to be the most promising dry reprocessing technology. In the advanced nuclear fuel cycle, one of the key steps is the separation of U and other substances in the high burn-up thermal reactor spent fuel and fast reactor spent fuel. These spent fuels have the characteristics of high burnup, high irradiation, and high plutonium content, which makes it difficult for the traditional water reprocessing process using TBP as the extraction agent to meet the separation requirements. In the process of dry reprocessing, water is not used as a solvent, and the main separation steps are carried out at ...

Claims

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Application Information

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IPC IPC(8): C25C3/36C25C7/02
CPCC25C3/36C25C7/025
Inventor 石伟群刘雅兰刘奎袁立永
Owner INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI
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