Selective electrodeposition of dysprosium in LiCl-KCl-GdCl3-DyCl3 melts at magnesium electrodes: Application to separation of nuclear wastes

Selective electrodeposition of dysprosium in LiCl-KCl-GdCl3-DyCl3 melts at magnesium electrodes: Application to separation of nuclear wastes
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在镁电极上选择性电沉积 LiCl-KCl-GdCl3-DyCl3 熔体中的镝:在核废料分离中的应用

DOI:
10.1016/j.electacta.2013.11.145
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发表时间:
2014-02
影响因子:
6.6
通讯作者:
Yong-de Yan
Yong-de Yan
中科院分区:
材料科学2区
文献类型:
--
作者:
Shu-ming Peng;Mei Li;Ke Ye;Yong-de Yan

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采用循环伏安法、方波伏安法和开路计时电位法研究了773 K时在LiCl-KCl共晶体系中,分别以W和Mg为惰性电极和活性电极时DyCl 3和GdCl 3溶液的电化学行为和萃取效率。在W和Mg电极上,Dy(III)离子通过两个连续步骤被还原成金属镝。以Mg-Dy合金的形式选择性电沉积镝比以纯金属形式容易,而不降低提取率。采用恒电位电解法从GdCl 3和DyCl 3混合溶液中提取Dy。存款的X射线衍射图谱表明有Mg 3 Dy相形成。扫描电子显微镜(SEM)和X射线能谱(EDS)分析结果表明,Dy的加入使合金晶粒细化
The electrochemical behaviour and extraction efficiency of DyCl3and GdCl3solutions were studied by cyclic voltammetry, square wave voltammetry and open-circuit chronopotentiometry in the eutectic LiCl-KCl at 773 K using inert and reactive electrodes, i.e. W and Mg, respectively. On W and Mg electrodes, Dy(III) ions are reduced to metallic dysprosium through two consecutive steps. The selective electrodepositing of dysprosium in a form of Mg-Dy alloys can be easier than that in a pure metallic form, without reduction of the extraction yield. Potentiostatic electrolysis experiments were performed to extract Dy from GdCl3and DyCl3mixtures at magnesium electrodes. XRD patterns of deposit indicated that Mg3Dy phase was formed. Scanning electron microscope (SEM) images with Energy dispersive X-ray Spectroscopy (EDS) showed the grain size was refined with a greater content of Dy in alloys
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