提取稀土金屬的電化學(xué)研究
本文關(guān)鍵詞: 釹電解 陽(yáng)極過(guò)程 陰極過(guò)程 陽(yáng)極效應(yīng) 氟熔鹽 出處:《華東理工大學(xué)》2015年碩士論文 論文類(lèi)型:學(xué)位論文
【摘要】:LiF-NdF3-Nd2O3是目前制備釹金屬及其合金的主要電解質(zhì)體系,研究該體系的陽(yáng)極過(guò)程以及陰極過(guò)程對(duì)釹電解工藝參數(shù)的選擇具有義。所以研究該體系中提取稀土金屬釹的電化學(xué)過(guò)程有重要的理論意義和實(shí)際意義。論文采用循環(huán)伏安法表征了LiF-NdF3-Nd2O3熔鹽體系中氧離子和氟離子在陽(yáng)極過(guò)程。氧離子的陽(yáng)極過(guò)程包括在無(wú)氣體析出條件下,氧化產(chǎn)物的吸附和陽(yáng)極氣體逸出下的氧離子氧化兩部分。在吸附部分,氧離子的氧化峰電位和峰電流密度均隨著Nd203含量的增加而增大,無(wú)氣體析出條件下,氧化產(chǎn)物的吸附過(guò)程為擴(kuò)散控制和電化學(xué)控制共同控制。在有氣體逸出條件下,氧離子氧化的控制過(guò)程為電化學(xué)控制。討論了Nd203含量、溫度、電極面積對(duì)氧離子氧化和陽(yáng)極效應(yīng)臨界電位的影響。氟離子的氧化起始電位從陽(yáng)極效應(yīng)的臨界電位開(kāi)始,反向掃描過(guò)程中的臨界電位是一個(gè)不變的電位。在陰極過(guò)程的研究中,運(yùn)用循環(huán)伏安法和方波法表征了釹離子的陰極過(guò)程。釹離子在還原過(guò)程中存在多步還原過(guò)程,并通過(guò)轉(zhuǎn)移電子數(shù)計(jì)算表征,分為Nd3+→Nd2+,Nd2+ →Nd,Nd3+→Nd三個(gè)過(guò)程,并確定了三個(gè)過(guò)程的還原電位。Nd3+→Nd2+的還原過(guò)程為擴(kuò)散控制,而Nd2+→Nd,Nd3+→Nd的控制過(guò)程為電化學(xué)反應(yīng)控制和擴(kuò)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.
【學(xué)位授予單位】:華東理工大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類(lèi)號(hào)】:TF845;TQ150
【參考文獻(xiàn)】
相關(guān)期刊論文 前10條
1 曹鐵平;李躍軍;;稀土納米材料的特性及應(yīng)用[J];長(zhǎng)春師范學(xué)院學(xué)報(bào);2007年06期
2 吳勇;;軟化學(xué)合成方法在稀土材料中的應(yīng)用[J];太原城市職業(yè)技術(shù)學(xué)院學(xué)報(bào);2011年12期
3 孟憲玲,楊化濱,王軍紅,周作祥;稀土氧化物對(duì)二次鋅電極性能的影響[J];電化學(xué);2005年01期
4 趙桂芳;熔鹽電解制取稀土金屬過(guò)程的一般規(guī)律[J];江西有色金屬;1988年02期
5 陸慶桃,葉云蔚,李國(guó)勛,葉尚云;氯化釹熔鹽電解的陰極過(guò)程[J];中國(guó)稀土學(xué)報(bào);1991年01期
6 張志宏,焦士琢,吳迪武,劉文淮;氧化物電解法制備釹鐵合金的研究[J];稀土;1993年01期
7 呂宏纓,胡瑞生,沈岳年,郝冬梅;稀土型高溫燃燒催化劑在天然氣發(fā)電中的應(yīng)用[J];稀土;2001年03期
8 徐秀芝,魏緒鈞,馮法倫,李學(xué)舜;在氟鹽體系中鑭離子陰極過(guò)程的研究[J];稀土;1994年04期
9 梁行方,馬宏軍,段淑貞,石青榮,王新東;在氟鹽體系中釹離子陰極過(guò)程的研究[J];稀土;1999年04期
10 王桂華;王祥生;朱鴻民;;Electroanalytical Study of Electrode Processes on Carbon Anode in Lithium Fluoride and Neodymium Fluoride Melt[J];Journal of Rare Earths;2007年S1期
相關(guān)碩士學(xué)位論文 前1條
1 陳瓊;熔鹽電解制備鎂鋰鋁及鎂鋰鋁基合金[D];哈爾濱工程大學(xué);2011年
,本文編號(hào):1525181
本文鏈接:http://sikaile.net/kejilunwen/huagong/1525181.html