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Method for separating uranium and neptunium through fluorination volatilization technology

A technology, fluorination technology, applied in the field of fluorination volatilization separation of uranium and neptunium, can solve the problems of complicated operation, high requirement of extraction agent, inability to achieve continuous operation, etc., and achieve high separation efficiency, stable properties and easy continuous operation Effect

Pending Publication Date: 2022-01-04
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the complex operation of separating uranium and neptunium in the prior art, the high requirement for the extractant, and the inability to achieve continuous defects, and to provide a method for separating uranium and neptunium by fluorination and volatilization technology , realized the efficient separation of uranium and neptunium

Method used

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  • Method for separating uranium and neptunium through fluorination volatilization technology
  • Method for separating uranium and neptunium through fluorination volatilization technology
  • Method for separating uranium and neptunium through fluorination volatilization technology

Examples

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Effect test

Embodiment 1

[0076] Example 1UF 4 Separation of uranium and neptunium in a mixture with Np

[0077] (1) 5.0g UF 4 and 1 mg neptunium elemental mixture, placed in the reactor, cover the reactor lid, and replace the atmosphere in the reactor with high-purity argon.

[0078] (2) Heating the reactor to raise the temperature from room temperature to 450°C, keep it warm for 2 hours, and feed nitrogen trifluoride and argon mixed gas (NF 3 The volume fraction is 20%), the flow rate is 0.3L / min, adopt Fourier transform infrared spectrometer to monitor the reactor outlet gas; adopt two-stage NaF adsorption column to reclaim UF 6 product, the temperature of the adsorption column is 100°C; after 60min, UF in the gas at the outlet of the reactor 6 When the concentration is lower than the lower limit of infrared detection, stop passing nitrogen trifluoride mixed gas at this time.

[0079] (3) After stopping the heating of the reactor to lower the temperature to 350°C, keep it warm for 1h, and feed t...

Embodiment 2

[0081] Embodiment 2UO 2 Separation of uranium and neptunium in a mixture with Np

[0082] (1) Add 3.0g UO 2 The mixture of 1 mg neptunium and elemental neptunium is placed in the reactor, the reactor lid is covered, and the atmosphere in the reactor is replaced with high-purity argon.

[0083] (2) Heating the reactor to raise the temperature from room temperature to 500°C, keep it warm for 1h, and pass a mixed gas of nitrogen trifluoride and argon (NF 3 The volume fraction is 30%), the flow rate is 0.2L / min, adopt Fourier transform infrared spectrometer to monitor the reactor outlet gas; adopt two-stage cold trap to reclaim UF 6 products, the condensing temperature is -40°C; after 120min, UF in the reactor outlet gas 6 When the concentration is lower than the lower limit of infrared detection, stop passing nitrogen trifluoride mixed gas at this time.

[0084] (3) After stopping the heating of the reactor to lower the temperature to 350°C, keep it warm for 1h, and feed the ...

Embodiment 3

[0086] Example 3LiF-BeF 2 Separation of Uranium and Neptunium in Molten Salt System

[0087] (1) 100g LiF-BeF 2 Molten salt (of which UF 4 Mass 5.0g, Np mass 0.5mg; LiF and BeF in eutectic salt 2 The molar ratio is 67:33) placed in the reactor, cover the reactor lid, and replace the atmosphere in the reactor with high-purity argon.

[0088] (2) Heating the reactor to raise the temperature from room temperature to 700°C, keep the temperature for 3 hours, and feed nitrogen trifluoride and argon mixed gas (NF 3 The volume fraction is 10%), the flow rate is 0.5L / min, adopt Fourier transform infrared spectrometer to monitor the reactor outlet gas; adopt two-stage NaF adsorption column to reclaim UF 6 product, the temperature of the adsorption column is 100°C; after 60min, UF in the gas at the outlet of the reactor 6 When the concentration is lower than the lower limit of infrared detection, stop passing nitrogen trifluoride mixed gas at this time.

[0089] (3) After stopping ...

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Abstract

The invention provides a method for separating uranium and neptunium through a fluorinated volatilization technology. The method comprises the following steps that (1), air and water in a reactor are removed, the reactor is filled with a mixture A or a mixture B, the mixture A comprises a substance containing uranium elements and neptunium elements, the mixture B comprises a substance containing uranium elements, a substance containing neptunium elements and fused salt, the substance containing uranium elements comprises uranium elementary substance and / or uranium compound; and the substance containing neptunium elements is neptunium elementary substance and / or neptunium compound; (2), reaction products containing uranium elements are recycled; and (3) the residual product after the uranium elements are recycled is cooled to 350-600 DEG C, mixed gas of fluorine gas and inert gas is introduced, a reaction product containing neptunium elements is recycled; and the reaction temperature in the step 2 is higher than that in the step 3. The method has the advantages that the reaction speed is high, the conversion rate of uranium and neptunium is large, the separation efficiency of uranium and neptunium is high, side reactions are few, the separation selectivity is good, and serialization is easy.

Description

technical field [0001] The invention relates to a method for volatilizing and separating uranium and neptunium by fluorination. Background technique [0002] As an efficient, clean and economical energy, nuclear energy plays an important role in meeting the long-term energy needs of human beings and addressing the greenhouse effect of the environment. Nuclear power generation is the most important aspect of the peaceful use of nuclear energy. With the development of power reactors and people's 237 A deep understanding of Np, a highly toxic and long-lived minor actinide, 237 The limitation of Np content in uranium products has attracted much attention. Since the operating environment of the uranium conversion process has no special protective conditions, it is necessary to strictly control the 237 Np content. on the other hand, 237 Thermal radiation products of Np 238 Pu is an important source of α radiation, with 238 The isotope battery prepared by Pu has relatively h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B60/02C22B7/00
CPCC22B60/0213C22B60/02C22B7/001Y02P10/20
Inventor 孙理鑫牛永生胡聪伟窦强李晴暖
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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