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首页> 外文学位 >Melting temperature variation and electrochemical study of lanthanide elements in lithium chloride-potassium chloride eutectic molten salt.
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Melting temperature variation and electrochemical study of lanthanide elements in lithium chloride-potassium chloride eutectic molten salt.

机译：氯化锂-氯化钾共晶熔融盐中镧系元素的熔融温度变化和电化学研究。

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摘要

The core objective of this project was to provide the supportive information for the pyrochemical reprocessing of spent nuclear fuels. The specific goals were to determine the thermodynamic and electrochemical data base of lanthanide elements in LiCl-KCl eutectic molten salts which is required for the better process control of pyrometallurgical reprocessing of spent fuels. In this thesis, two different scopes related to reprocessing of spent fuels were studied. The first study was to determine the melting temperature variation of LiCl-KCl eutectic mixture in presence of lanthanide elements and the second was study of the reduction behavior of lanthanide elements mixed with LiCl-KCl eutectic. The first study was performed by thermal analysis in order to determine the temperature variations of LiCl-KCl eutectic mixture in the presence of lanthanide elements. The result of single, as well as multi-component lanthanide elements below 5 mol% contain in LiCl-KCl eutectic mixture is presented. The results showed that the lanthanide elements below 5 mol% do not vary the melting temperature significantly. The mixture temperatures are well below the melting temperature of LiCl-KCl eutectic melting temperature. For the second case cyclic voltammetry studies were carried out to determine the changes occurring in reduction potentials when multi-components lanthanide elements are present in molten salt containing LiCl-KCl eutectic mixture. The result of mixtures containing binary, ternary and quaternary systems showed that the initiation of cathodic waves occur at lower cathodic potential than the standard redox potential of the component presents in the system. The cathodic wave potentials are shifted to less negative values, and in some cases closer to -1.7 V Ag/AgCl at 500 °C. This reduction potential is closer to the redox potential of Pu(III)/Pu system. These results indicate that presence of multiple fission products in the LiCl+KCl eutectic could affect the separation kinetics of the actinides.
机译：该项目的核心目标是为乏核燃料的热化学后处理提供支持性信息。具体目标是确定LiCl-KCl共晶熔融盐中镧系元素的热力学和电化学数据库，这对于更好地控制乏燃料的火法后处理是必需的。本文研究了与乏燃料后处理有关的两个不同范围。第一项研究是确定存在镧系元素的LiCl-KCl共晶混合物的熔融温度变化，第二项研究是与LiCl-KCl共晶混合物混合的镧系元素的还原行为。为了确定在镧系元素存在下LiCl-KCl共晶混合物的温度变化，通过热分析进行了第一个研究。给出了LiCl-KCl共晶混合物中含量低于5 mol％的单组分和多组分镧系元素的结果。结果表明，低于5mol％的镧系元素没有显着改变熔融温度。混合物温度远低于LiCl-KCl共晶熔化温度的熔化温度。对于第二种情况，进行了循环伏安法研究，以确定当多组分镧系元素存在于含LiCl-KCl共晶混合物的熔融盐中时，还原电位的变化。包含二元，三元和四元体系的混合物的结果表明，阴极波的引发发生在比系统中存在的组分的标准氧化还原电势低的阴极电势上。阴极波电位在500°C时移到较小的负值，在某些情况下更接近-1.7 V Ag / AgCl。该还原电势更接近Pu（III）/ Pu系统的氧化还原电势。这些结果表明，LiCl + KCl共晶中存在多种裂变产物可能会影响the系元素的分离动力学。

著录项

  • 作者

    Baral, Sudhir.;

  • 作者单位

    University of Nevada, Reno.;

  • 授予单位 University of Nevada, Reno.;
  • 学科 Engineering Nuclear.;Engineering Materials Science.;Engineering Metallurgy.
  • 学位 M.S.
  • 年度 2010
  • 页码 113 p.
  • 总页数 113
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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