Nuclear Techniques ›› 2016, Vol. 39 ›› Issue (9): 90301-090301.doi: 10.11889/j.0253-3219.2016.hjs.39.090301

• NUCLEAR CHEMISTRY, RADIOCHEMISTRY, RADIOPHARMACEUTICALS AND NUCLEAR MEDICINE • Previous Articles     Next Articles

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

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

  1. Department of Radiochemistry, China Institute of Atomic Energy, Beijing 102413, China
  • Received:2016-01-15 Revised:2016-04-29 Online:2016-09-10 Published:2016-09-09
  • Supported by:

    Supported by National Natural Science Foundation of China(No.91326111)

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

Key words: Hydrazine, Reduction stripping, Separation of neptunium and plutonium

CLC Number: 

  • TL241.1