熔盐电解制备Dy-Cu合金及其电极还原过程研究  

Research on Electrolytic Reduction Process and Preparation of Dy-Cu Alloy by Electrolysis in Molten Salt

作　　者：陈淑梅 廖春发[1] 蔡伯清 王旭[1] 焦芸芬[1] 曾颜亮[1] CHEN Shu-mei;LIAO Chun-fa;CAI Bo-qing;WANG Xu;JIAO Yun-fen;ZENG Yan-liang(Faculty of Materials Metallurgy and Chemistry,Jiangxi University of Science and Technology,Ganzhou 341000,China)

机构地区：[1]江西理工大学材料冶金化学学部,江西赣州341000

出　　处：《稀有金属与硬质合金》2020年第4期1-5,11,共6页Rare Metals and Cemented Carbides

基　　金：国家自然科学基金(51674126,51564015);江西省自然科学基金(20161BAB206142)。

摘　　要：采用LiF-DyF3为基础熔盐电解质,Dy2O3、Cu2O为电解原料,采用熔盐电解法制备了Dy-Cu中间合金。利用扫描电镜(SEM)、能谱仪(EDS)及X射线衍射仪(XRD)对电解产物的形貌及物相组成进行分析;通过循环伏安法分析Dy(Ⅲ)、Cu(Ⅰ)在钨阴极的电极还原过程。结果表明,LiF-DyF3(24mol%)-3%Dy2O3-1%Cu2O体系下,控制温度970℃、电解时间1.0 h,可制备Cu-Dy中间合金且合金主要物相为CuDy;当电解过程稳定进行时,相同阴极电流密度下,槽电压的变化较小,而随着阴极电流密度的提高,槽电压逐渐增大,电流效率先升高后降低;在LiF-DyF3(24mol%)熔盐体系内,Dy2O3、Cu2O电极还原过程都是一步完成,Dy(Ⅲ)在钨电极上还原电位在-0.6^-0.4 V附近;Cu(Ⅰ)在钨电极上还原电位在-0.6 V附近。Dy-Cu master alloy was prepared by molten salt electrolysis using LiF-DyF3 as basic molten electrolyte and Dy2O3 and Cu2O as raw materials.The morphology and phase composition of the electrolytic products were analyzed by scanning electron microscope(SEM),energy dispersive spectrometer(EDS) and X-ray diffractometer(XRD).The electrolysis reduction process of Dy(Ⅲ) and Cu(Ⅰ) in tungsten cathode was investigated by cyclic voltammetry.The results show that Dy-Cu master alloy with the main phase of CuDy can be prepared in LiF-DyF3(24 mol%)-3%Dy2O3-1%Cu2O system at 970 ℃ for 1.0 h.When the electrolysis process is stable,cell voltage changes little with the same cathode current density.However,with the increase of cathode current density,the cell voltage gradually increases,and the current efficiency firstly increases and then decreases.In LiF-DyF3(24 mol%) molten salt system,the electrolysis reduction process of Dy2O3 and Cu2O is completed in one step.The reduction potential of Dy(Ⅲ) on tungsten electrode is about-0.6^-0.4 V,and that of Cu(Ⅰ) on tungsten electrode is about-0.6 V.

关 键 词：熔盐电解 LiF-DyF3体系 Dy-Cu中间合金 Dy2O3 CU2O 循环伏安曲线 

分 类 号：TF845.3[冶金工程—有色金属冶金]