NdF_(3)-LiF-Nd_(2)O_(3)-NdF_(2)熔盐体系结晶行为的研究  

Study on Crystallization Behavior of NdF_(3)-LiF-Nd_(2)O_(3)-NdF_(2) Molten Salt System

作　　者：姜银举[1,2] 段超 邓永春[1,2] 辛文彬[1,2] 唐家悦[1,2] 樊文军 JIANG Yin-ju;DUAN Chao;DENG Yong-chun;XIN Wen-bing;TANG Jia-yue;FAN Wen-jun(School of Materials and Metallurgy,Inner Mongolia University of Science&Technology,Baotou 014010,China;Inner Mongolia Autonomous Region Engineering Research Center for Clean Extraction and Application of Light Rare Earth,Inner Mongolia University of Science&Technology,Baotou 014010,China)

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010 [2]内蒙古科技大学轻稀土清洁提取与应用内蒙古自治区工程研究中心,内蒙古包头014010

出　　处：《稀有金属与硬质合金》2024年第2期1-5,共5页Rare Metals and Cemented Carbides

基　　金：国家重点研发计划项目(2022YFC2905800);内蒙古自治区直属高校基本科研业务费项目(037,052)。

摘　　要：氟化物体系稀土氧化物熔盐电解过程中,熔盐的结晶析出行为显著影响电解过程,为此本文针对NdF_(3)-LiF-Nd_(2)O_(3)、NdF_(3)-LiF-NdF_(2)以及NdF_(3)-LiF-Nd_(2)O_(3)-NdF_(2)三种熔盐体系(NdF_(3)和LiF质量比固定为85∶15),采用降温黏度曲线测定熔盐的结晶温度,通过X射线衍射分析结晶物相。结果表明:NdF_(3)-LiF-Nd_(2)O_(3)和NdF_(3)-LiF-NdF_(2)熔盐体系中,随着熔盐中Nd_(2)O_(3)或NdF_(2)含量的增加,熔盐的结晶温度升高,熔盐的结晶物相分别为NdOF和NdF_(2);NdF_(3)-LiF-Nd_(2)O_(3)-NdF_(2)熔盐体系中,当Nd_(2)O_(3)含量为2%~3%、NdF_(2)含量为1%~3%时,熔盐结晶温度在981~988℃范围内,且NdOF与NdF_(2)共结晶。适当提高电解槽底部温度、改善底部熔盐的流动性,是抑制稀土熔盐电解过程熔盐结晶析出的有效方法。In the molten salt electrolysis process of rare earth oxide in fluoride system,the crystallization behavior of the molten salt significantly affects the electrolysis process.The study investigated three molten salt systems,namely NdF_(3)-LiF-Nd_(2)O_(3),NdF_(3)-LiF-NdF_(2),and NdF_(3)-LiF-Nd_(2)O_(3)-NdF_(2)(with a fixed mass ratio of NdF_(3) to LiF of 85∶15),to measure the crystallization temperature of the molten salt using the cooling viscosity curve and analyze the crystalline phase by XRD.The results show that in the molten salt systems of NdF_(3)-LiF-Nd_(2)O_(3) and NdF_(3)-LiF-NdF_(2),the crystallization temperature of the molten salt increases with the increase in Nd_(2)O_(3) or NdF_(2) content,and the crystalline phases are NdOF and NdF_(2),respectively.In the molten salt system of NdF_(3)-LiF-Nd_(2)O_(3)-NdF_(2),when the Nd_(2)O_(3) content is in the range of 2%~3%with the NdF_(2) content in the range of 1%~3%,the crystallization temperature of the molten salt is in 981~988℃,and NdOF cocrystallizes with NdF_(2).To inhibit the crystallization and precipitation of the molten salt during the molten salt electrolysis process of rare earth,effective measures could be taken by appropriately increasing the temperature at the bottom of the electrolysis cell and improving the flowability of the molten salt at the bottom.

关 键 词：熔盐电解 NdF_(3)-LiF-Nd_(2)O_(3)-NdF_(2) 黏度 结晶温度 结晶物相 

分 类 号：TF845.6[冶金工程—有色金属冶金]