摘要
(LiF-CeF_(3))_(eut.)-CeO_(2)熔盐体系粘度和电导率是深度影响电解制备Ce-Fe合金的重要传输特性,对解析熔盐结构也具有重要参考价值。本文采用等温饱和法确定CeO_(2)在温度1173~1423 K范围内共晶(LiF-CeF_(3))_(eut.)中的溶解度,运用旋转法和连续变化电导池常数(CVCC)法分别测定CeO_(2)溶解度范围内(LiF-CeF_(3))_(eut.)-CeO_(2)体系在1173~1373 K范围的粘度和电导率,并解析“粘度-电导率”的关联关系。结果表明:温度1173~1423 K范围内(LiF-CeF_(3))_(eut.)体系中CeO_(2)溶解度在2.62%~2.94%区间线性增加。在CeO_(2)溶解度范围内,(LiF-CeF_(3))_(eut.)-CeO_(2)体系粘度随温度在1173~1373 K区间内增大非线性减小,同时,当温度一定时,体系的粘度在CeO_(2)溶解度范围随浓度增加呈非线性增大。在CeO_(2)溶解度范围内,(LiF-CeF_(3))_(eut.)-CeO_(2)体系的电导率在1173~1373 K区间随温度线性递增,同时,温度一定时,随CeO_(2)浓度增加而线性递减。体系的粘度由“高温(1273~1373 K)-低浓度(S_(ceO2)><1.5%)”区间向“低温(1173~1273 K)-高浓度(S_(ceO2)>>2.5%)”区间过渡过程中逐渐增加,等值区非线性扩展。电导率由“高温(1273~1373 K)-低浓度(S_(ceO2)><1.25%)”区域向“低温(1173~1273 K)-高浓度(S_(ceO2)>>2.5%)”区域变化过程中逐渐减小,等值区线性扩展。在温度1173~1373 K区间CeO_(2)溶解范围内(LiF-CeF_(3))_(eut.)-CeO_(2)体系的“粘度-电导率”之间为指数递减关系。
The viscosity and conductivity of molten salt system of(LiF-CeF_(3))_(eut.)-CeO_(2)are important transport characteristics that deeply affect the electrolytic preparation of Ce-Fe alloy,and at the same time,their correlation is of great value to the analysis of molten salt structure.In this study,the solubility of CeO_(2)in eutectic(LiF-CeF_(3))_(eut.)system was determined by isothermal saturation method in the temperature range of 1173-1423 K,andthe viscosity and conductivity of(LiF-CeF_(3))_(eut.)-CeO_(2)system with different concentrations were measured by rotating method and continuously changing conductivity cell constant(CVCC)method,respectively,and the correlation was analyzed.The results show that the solubility of Ce0_(2)in the(LiF-CeF_(3))_(eut.)system increases linearly in the interval of 2.62%-2.94%in the temperature range of 1173-1423 K.The viscosity of the(LiF-CeF_(3))_(eut.)-CeO_(2)system decreases nonlinearly with increasing temperature in the range of CeO_(2)solubility within the interval of 1173-1373 K.At the same time,the viscosity of the system increases nonlinearly with increasing concentration in the range of CeO_(2)solubility when the temperature is certain.The conductivity of the(LiF-CeF_(3))_(eut.)-CeO_(2)system increases linearly with temperature in the 1173-1373 K interval over the Ce02 solubility range,while it decreases linearly with increasing CeO_(2)concentration at a certain temperature.The viscosity of the system gradually increase from the"high temperature(1273-1373 K)-low concentration(S_(ceO2)<1.5%)"interval to the"low temperature(1173-1273 K)-high concentration(Sceo,>2.5%)"interval.The conductivity gradually decreasesduring the transition from"high temperature(1273-1373 K)-low concentration(Sc.o,<1.25%)"to"low temperature(1173-1273 K)-high concentration(S_(ceO2)>2.5%)",with a nonlinear expansion of the isopycnal region.The isotropic region is linearly expanding with a gradual decrease.There is an exponential decreasing relationship between the temperature(1173-1373 K)and the"viscosity-conductivity"below the saturated CeO_(2)concentration range.
作者
赖江源
王旭
廖春发
蓝桥发
吴迪
Lai Jiangyuan;Wang Xu;Liao Chunfa;Lan Qiaofa;Wu Di(College of Metallurgical Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China;Jiangxi Ionic Rare Earth Engineering Research Co.,Ltd.,Ganzhou 341000,China)
出处
《中国稀土学报》
北大核心
2025年第4期797-802,共6页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金项目(52074134)
国家重点研发计划课题(2022YFC2905205)资助。
关键词
粘度
电导率
熔盐
旋转法
连续变化电导池常数
稀土
viscosity
conductivity
molten salt
rotation method
continuous variation of conductivity cell constant
rare earths
