NdF3-LiF-Nd2O3-NdF2熔盐体系结晶行为的研究
Study on Crystallization Behavior of NdF3-LiF-Nd2O3-NdF2 Molten Salt System
姜银举 1段超 1邓永春 1辛文彬 1唐家悦 1樊文军1
作者信息
- 1. 内蒙古科技大学材料与冶金学院,内蒙古包头 014010;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
- 折叠
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NdF3-LiF-Nd2O3、NdF3-LiF-NdF2以及NdF3-LiF-Nd2O3-NdF2三种熔盐体系(NdF3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:NdF3-LiF-Nd2O3和NdF3-LiF-NdF2熔盐体系中,随着熔盐中Nd2O3或NdF2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NdF2;NdF3-LiF-Nd2O3-NdF2熔盐体系中,当Nd2O3含量为2％～3％、NdF2含量为1％～3％时,熔盐结晶温度在981～988 ℃范围内,且NdOF与NdF2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.
Abstract
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 mol-ten salt systems,namely NdF3-LiF-Nd2O3,NdF3-LiF-NdF2,and NdF3-LiF-Nd2O3-NdF2(with a fixed mass ratio of NdF3 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 NdF3-LiF-Nd2O3 and NdF3-LiF-NdF2,the crystallization temperature of the molten salt increa-ses with the increase in Nd2O3 or NdF2 content,and the crystalline phases are NdOF and NdF2,respective-ly.In the molten salt system of NdF3-LiF-Nd2O3-NdF2,when the Nd2O3 content is in the range of 2％～3％with the NdF2 content in the range of l％～3％,the crystallization temperature of the molten salt is in 981～988 ℃,and NdOF cocrystallizes with NdF2.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/NdF3-LiF-Nd2O3-NdF2/黏度/结晶温度/结晶物相Key words
molten salt electrolysis/NdF3-LiF-Nd2O3-NdF2/viscosity/crystallization temperature/crystalline phase引用本文复制引用
基金项目
国家重点研发计划(2022YFC2905800)
内蒙古自治区直属高校基本科研业务费项目(037)
内蒙古自治区直属高校基本科研业务费项目(052)
出版年
2024
NETL
NSTL
万方数据