Separation Np from Pu based on reduction-stripping by using hydrazine nitrate as reductant

He YANG; Hu ZHANG; Li LI; Xiaohong HUANG; Riteng WANG

doi:10.11889/j.0253-3219.2016.hjs.39.090301

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Separation Np from Pu based on reduction-stripping by using hydrazine nitrate as reductant

NUCLEAR CHEMISTRY, RADIOCHEMISTRY, RADIOPHARMACEUTICALS AND NUCLEAR MEDICINE | 更新时间：2021-05-24

- Separation Np from Pu based on reduction-stripping by using hydrazine nitrate as reductant
- NUCLEAR TECHNIQUES Vol. 39, Issue 9, Article number: 090301(2016)
- 作者机构：
  
  中国原子能科学研究院放射化学研究所北京 102413
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China
- DOI：10.11889/j.0253-3219.2016.hjs.39.090301
  CLC： TL241.1
- Received：15 January 2016，
  
  Revised：29 April 2016，
  
  Published：2016-09
- 稿件说明：
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He YANG, Hu ZHANG, Li LI, et al. Separation Np from Pu based on reduction-stripping by using hydrazine nitrate as reductant[J]. Nuclear techniques, 2016, 39(9): 090301
DOI：

He YANG, Hu ZHANG, Li LI, et al. Separation Np from Pu based on reduction-stripping by using hydrazine nitrate as reductant[J]. Nuclear techniques, 2016, 39(9): 090301 DOI： 10.11889/j.0253-3219.2016.hjs.39.090301.

摘要

镎的提取和分离是国际后处理领域重点关注的研究课题之一。在Purex流程中，硝酸肼常被用来作为亚硝酸的清扫剂，此外，由于硝酸肼对Np（VI）和Pu（IV）的氧化还原反应具有选择性，理论上可以利用其反应速率上的差异来实现镎与铀钚的分离。为探索硝酸肼分离镎/钚工艺提供可行性，本文采用单级萃取设备研究了硝酸肼还原反萃Np和Pu的过程。通过研究硝酸浓度、硝酸肼浓度和反应温度对还原反萃过程的影响，确定了Np（VI）和Pu（IV）反萃动力学方程和表现活化能。进一步通过动力学方程得出硝酸肼还原反萃Np（VI）和Pu（IV）的半反应时间，并对 Np（VI）/Pu（IV）分离过程的工艺进行了初步探索。

Abstract

Background:

Extraction and separation of neptunium is one of the topics focused in reprocessing.Hydrazine nitrate is often used as a cleaning agent for nitrous acid in the Purex process.In addition

due to the selectivity of hydrazine nitrate for the redox reactions of Np(VI)and Pu(IV)

theoretically the difference of the reaction rate can be used to separate the neptunium from uranium and plutonium.

Purpose:

In order to explore the feasibility of separation for neptunium and plutonium with hydrazine nitrate

this paper adopts the single stage extraction experiments to research the process of reductive stripping of neptunium and plutonium.

Methods:

By investigating the effects of the concentration on nitric acid and hydrazine nitrate

as well as reaction temperature on the reductive stripping process

the Np(VI)and Pu(IV)stripping kinetics equation and apparent activation energy were determined.Further

the half reaction time of reductive stripping Np(VI)and Pu(IV)with hydrazine nitrate can be obtained by means of kinetics equation

and a preliminary exploration for Np(VI)/Pu(IV)separation was carried out.

Results and Conclusion:

The rate equations of the reaction Np(VI)with hydrazine and Pu(IV)with hydrazine were respectively obtained.Further

the half reaction time of reductive stripping Np(VI)and Pu(IV)with hydrazine nitrate can be obtained by means of kinetics equation

and a preliminary exploration for Np(VI)/Pu(IV)separation was carried out

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references

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