提取稀土金属的电化学研究

发布时间：2018-02-22 19:59

本文关键词： 钕电解阳极过程阴极过程阳极效应氟熔盐　出处：《华东理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：LiF-NdF3-Nd2O3是目前制备钕金属及其合金的主要电解质体系,研究该体系的阳极过程以及阴极过程对钕电解工艺参数的选择具有义。所以研究该体系中提取稀土金属钕的电化学过程有重要的理论意义和实际意义。论文采用循环伏安法表征了LiF-NdF3-Nd2O3熔盐体系中氧离子和氟离子在阳极过程。氧离子的阳极过程包括在无气体析出条件下,氧化产物的吸附和阳极气体逸出下的氧离子氧化两部分。在吸附部分,氧离子的氧化峰电位和峰电流密度均随着Nd203含量的增加而增大,无气体析出条件下,氧化产物的吸附过程为扩散控制和电化学控制共同控制。在有气体逸出条件下,氧离子氧化的控制过程为电化学控制。讨论了Nd203含量、温度、电极面积对氧离子氧化和阳极效应临界电位的影响。氟离子的氧化起始电位从阳极效应的临界电位开始,反向扫描过程中的临界电位是一个不变的电位。在阴极过程的研究中,运用循环伏安法和方波法表征了钕离子的阴极过程。钕离子在还原过程中存在多步还原过程,并通过转移电子数计算表征,分为Nd3+→Nd2+,Nd2+ →Nd,Nd3+→Nd三个过程,并确定了三个过程的还原电位。Nd3+→Nd2+的还原过程为扩散控制,而Nd2+→Nd,Nd3+→Nd的控制过程为电化学反应控制和扩散控制共同控制。
[Abstract]:LiF-NdF3-Nd2O3 is the main electrolyte system for the preparation of neodymium and its alloys. It is meaningful to study the anode process and cathodic process of the system for the selection of process parameters of neodymium electrolysis. Therefore, it is of great theoretical and practical significance to study the electrochemical process of neodymium extraction from the system. The anodic process of oxygen ion and fluorine ion in LiF-NdF3-Nd2O3 molten salt system was characterized by cyclic voltammetry. The oxidation peak potential and peak current density of oxygen ions increased with the increase of Nd203 content in the adsorbed part and the oxygen ion oxidation under anodic gas escape condition, and the oxygen ion oxidation peak potential and peak current density increased with the increase of Nd203 content in the adsorbed part. The adsorption process of oxidation products is controlled by diffusion control and electrochemical control. Under the condition of gas escape, the process of oxygen ion oxidation is controlled by electrochemistry. The content of Nd203, temperature and temperature are discussed. The effect of electrode area on the critical potential of oxygen ion oxidation and anodic effect. The initial oxidation potential of fluorine ion begins with the critical potential of anodic effect, and the critical potential during reverse scanning is a constant potential. The cathodic process of neodymium ion was characterized by cyclic voltammetry and square wave method. There was a multi-step reduction process in the process of neodymium ion reduction, which was characterized by calculating the number of transferred electrons and divided into Nd3. 鈫扤d2 ,Nd2. 鈫扤d,Nd3. 鈫扤D three processes and the reduction potential. ND 3 of the three processes have been determined. 鈫扵he reduction process of Nd2 is diffusion control, while Nd2. 鈫扤d,Nd3. 鈫扵he control process of ND is controlled by electrochemical reaction control and diffusion control.
【学位授予单位】：华东理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TF845;TQ150

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