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

Zhanyuan LIU; Hu ZHANG; Riteng WANG; Yongzhi NING

doi:10.11889/j.0253-3219.2017.hjs.40.090301

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

NUCLEAR CHEMISTRY, RADIOCHEMISTRY, RADIOPHARMACEUTICALS AND NUCLEAR MEDICINE | 更新时间：2021-05-19

- Separation Np from Pu based on reduction-stripping by using methyl hydrazine as reductant
- NUCLEAR TECHNIQUES Vol. 40, Issue 9, Article number: 090301(2017)
- 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.0253-3219.2017.hjs.40.090301
  CLC： TL241.1
- Received：09 January 2017，
  
  Revised：29 March 2017，
  
  Published：10 September 2017
- 稿件说明：
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Zhanyuan LIU, Hu ZHANG, Riteng WANG, et al. Separation Np from Pu based on reduction-stripping by using methyl hydrazine as reductant[J]. Nuclear techniques, 2017, 40(9): 090301
DOI：

Zhanyuan LIU, Hu ZHANG, Riteng WANG, et al. Separation Np from Pu based on reduction-stripping by using methyl hydrazine as reductant[J]. Nuclear techniques, 2017, 40(9): 090301 DOI： 10.11889/j.0253-3219.2017.hjs.40.090301.

摘要

镎的提取和分离是后处理领域重点关注的研究课题之一。甲基肼作为一种有机无盐试剂，其还原Np（Ⅵ）的速率快于还原Pu（Ⅳ）的速率，理论上可以利用其反应速率上的差异来实现镎与钚的分离。为了探索甲基肼还原反萃分离镎、钚的可行性，本文采用单级萃取池研究了甲基肼还原反萃Np（Ⅵ）和Pu（Ⅳ）的过程。通过考察还原剂浓度、硝酸浓度以及反应温度和搅拌速率等条件对甲基肼还原反萃Np（Ⅵ）和Pu（Ⅳ）过程的影响，确定了Np（Ⅵ）和Pu（Ⅳ）反萃动力学方程和表观活化能。通过所得的动力学方程得出甲基肼还原反萃Np（Ⅵ）和Pu（Ⅳ）的半反应时间，并对Np（Ⅵ）和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 focused research topics in the field of reprocessing. As an organic salting-free reductant

because of its reduction rate differences between Np(Ⅵ) and Pu(Ⅳ)

methyl hydrazine (MMH) has the potential to separate Np/Pu.

Purpose

In this study

the feasibility of applying MMH to reductive stripping separate Np/Pu was evaluated.

Methods

The reductive back-extraction dynamics of Np(Ⅵ) and Pu(Ⅳ) by MMH were investigated using a single-stage extraction device.

Results

By investigating the effects of the concentration for nitric acid and methyl hydrazine nitrate

as well as reaction temperature on the reductive stripping process

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

Conclusion

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.

关键词

Keywords

references

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Related Institution

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北京萃取应用技术研究所

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