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A method for separating uranium and molybdenum by fluorination using nitrogen trifluoride as fluorinating agent

A technology for chemical separation of uranium and nitrogen trifluoride, which is applied in separation methods, chemical instruments and methods, and dispersed particle separation, etc., and can solve the problems of complex recovery of high-purity molybdenum elements, low separation efficiency of uranium and molybdenum, and complicated operations. , to achieve the effect of reducing the generation of radioactive waste, stable properties and low chemical toxicity

Active Publication Date: 2021-05-18
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

[0005] The technical problem to be solved by the present invention is to overcome the defects in the prior art that the separation efficiency of uranium and molybdenum is low, the operation is complicated, and the flow process for recovering high-purity molybdenum is relatively complicated, and a nitrogen trifluoride-based Fluorinating agent, a method to achieve efficient separation of uranium and molybdenum by precisely controlling the fluorination reaction temperature

Method used

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  • A method for separating uranium and molybdenum by fluorination using nitrogen trifluoride as fluorinating agent
  • A method for separating uranium and molybdenum by fluorination using nitrogen trifluoride as fluorinating agent
  • A method for separating uranium and molybdenum by fluorination using nitrogen trifluoride as fluorinating agent

Examples

Experimental program
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Effect test

Embodiment 1

[0058] Example 1UF 4 Separation of uranium and molybdenum in a mixture with molybdenum

[0059] (1) 5.0g UF 4 A mixture of molybdenum and molybdenum (wherein UF 4 Mass 4.0g, Mo powder 1.0g) placed in the reactor, cover the reactor lid, replace the atmosphere in the reactor with high-purity argon.

[0060] (2) Heating the reactor to raise the temperature from room temperature to 350°C, keep it warm for 2 hours, and pass a mixed gas of nitrogen trifluoride and argon (NF 3 The volume fraction is 20%), flow is 0.3L / min, adopts Fourier transform infrared spectrometer to monitor reactor outlet gas, the result is as follows figure 2 shown; two-stage MgF 2 Adsorption column recovery of MoF 6 product, the temperature of the adsorption column is 125°C; after 70min, the MoF in the outlet gas 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.

[0061] (3) After continuing to heat th...

Embodiment 2

[0063] Embodiment 2UO 2 Separation of uranium and molybdenum in a mixture with molybdenum

[0064] (1) Add 3.0g UO 2 A mixture of molybdenum and molybdenum (wherein UO 2 Mass 2.8g, Mo powder 0.2g) placed in the reactor, cover the reactor lid, replace the atmosphere in the reactor with high-purity argon.

[0065] (2) Heating the reactor to raise the temperature from room temperature to 400°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, the reactor outlet gas is monitored by Fourier transform infrared spectrometer; the MoF is recovered by two-stage cold trap 6 products, the condensing temperature is -40°C; after 20 minutes, the MoF in the outlet gas 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.

[0066] (3) After continuing to heat the reactor to raise the temperature to 550°C, ...

Embodiment 3

[0068] Example 3LiF-BeF 2 Separation of Uranium and Molybdenum in Molten Salt System

[0069] (1) 50g LiF-BeF 2 Molten salt (of which UF 4 Mass 5.0g, Mo mass 0.5g) placed in the reactor, cover the reactor lid, replace the atmosphere in the reactor with high-purity argon.

[0070] (2) Heating the reactor to raise the temperature from room temperature to 450°C, keep it warm 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, and the gas at the outlet of the reactor is monitored by a Fourier transform infrared spectrometer; two-stage MgF 2 Adsorption column recovery of MoF 6 product, the temperature of the adsorption column is 110°C; after 40min, the MoF in the outlet gas 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.

[0071] (3) After continuing to heat the reactor to raise the temperature to 700°C...

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Abstract

The invention discloses a method for fluorinating and separating uranium and molybdenum by using nitrogen trifluoride as a fluorinating agent. A mixture A composed of substances containing uranium elements, a substance containing molybdenum elements, and a molten salt; the content of the uranium element is greater than or equal to 10ppb; and / or, the content of the molybdenum element is greater than or equal to 10ppb; 2) Heating the reactor in stages, the first stage is heated from room temperature to 250-450°C, and a mixed gas of nitrogen trifluoride and inert gas is introduced to recover the reaction product containing molybdenum; 3) The second stage consists of At the end of the first stage, the temperature is heated to 450-850°C, and the mixed gas is continuously introduced to recover the reaction product containing uranium. The method provided by the invention can not only realize efficient separation of U-Mo, but also realize stable long-term operation of equipment.

Description

technical field [0001] The invention belongs to the field of nuclear energy industry technology and dry metallurgy technology, and specifically relates to a method for fluorinating and separating uranium and molybdenum by using nitrogen trifluoride as a fluorinating agent. Background technique [0002] In the uranium conversion of nuclear fuel pretreatment and spent fuel dry reprocessing uranium recovery process, the fluorination and volatilization process is a treatment method that can quickly and efficiently obtain uranium products. The principle is to use the traditional fluorinating agent F 2 , Convert uranium-containing substances (such as uranium oxide, uranium tetrafluoride, metal uranium and uranium nitride, etc.) into volatile uranium hexafluoride, so as to realize the separation and recovery of uranium. In the process of fluorination reaction to recover uranium, due to the F 2 Strong oxidation and weak fluorination selectivity, the Mo isotope produced by fission w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/02C22B60/02C22B7/00C22B34/34
CPCC22B7/002C22B34/34C22B60/0213Y02P10/20
Inventor 牛永生孙理鑫胡聪伟窦强李晴暖
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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