摘要
LiF-[CaF_(2)/YbF_(3)]-Yb_(2)O_(3)熔盐体系的密度是电解法制备稀土Yb合金的重要参数。本文采用阿基米德法测量和分析在1173~1573 K温度范围内LiF-[CaF_(2)/YbF_(3)]-Yb_(2)O_(3)体系的密度及其变化规律,同时,利用数学模型估测Yb-Ni合金密度,分析电解过程中熔盐与合金的分离性,结果表明:在1173~1573 K温度范围内,(LiF-CaF_(2))eut(eut为熔盐体系共晶点)体系与(LiF-YbF_(3))eut体系密度均随温度升高而线性降低,同时,摩尔体积均随温度线性递增;(LiF-YbF_(3))eut体系过剩体积随温度线性递减;在1173~1573 K温度区间和Yb_(2)O_(3)质量分数在0~4%范围内,当Yb_(2)O_(3)含量一定时,(LiF-CaF_(2))eut-Yb_(2)O_(3)和(LiF-YbF_(3))eut-Yb_(2)O_(3)熔盐体系的密度均随温度升高而线性降低,当温度一定时,(LiF-CaF_(2))eut-Yb_(2)O_(3)体系在0≤x(Yb_(2)O_(3))≤2.5%范围内呈线性递增,而((LiF-YbF_(3))eut-Yb_(2)O_(3)体系在0≤x(Yb_(2)O_(3))≤3.5%范围内呈线性递增;Yb-Ni合金的密度要高于LiF-[CaF_(2)/YbF_(3)]-Yb_(2)O_(3)熔盐体系的密度,在电解过程中易于分离。
The density of LiF-[CaF_(2)/YbF_(3)]-Yb_(2)O_(3) molten salt system is an important parameter for preparing rare earth Yb alloy by electrolysis.In this paper,Archimedes method was used to measure and analyze the density of LiF-[CaF_(2)/YbF_(3)]-Yb_(2)O_(3) system and its changing rule in the temperature range of 1173-1573 K.Meanwhile,mathematical models were used to estimate the density of Yb-Ni alloy and analyze its separation characteristic between molten salt and alloy during electrolysis.The results showed that the density of the system(LiF-CaF_(2))eut and(LiF-YbF_(3))eut system decreased linearly with higher temperature,and the molar volume increased linearly with rising temperature.Moreover,the excess volume of(LiF-YbF_(3))eut system decreased linearly with the temperature.In the range of Yb_(2)O_(3) ratio from 0 to 4wt%with the temperature ranging between 1173 and 1573 K,the density of(LiF-CaF_(2))eut-Yb_(2)O_(3) and(LiF-YbF_(3))eut-Yb_(2)O_(3) molten salt systems decreased linearly as the temperature rised.When the temperature was constant,(LiF-CaF_(2))eut-Yb_(2)O_(3) system increased linearly in the range of 0≤x(Yb_(2)O_(3))≤2.5%,while(LiF-YbF_(3))eut-Yb_(2)O_(3) system increased linearly in the range of 0≤x(Yb_(2)O_(3))≤3.5%.The density of Yb-Ni alloy was higher than that of LiF-[CaF_(2)/YbF_(3)]-Yb_(2)O_(3) molten salt system so that it was easier to be separated by electrolysis.
作者
彭军军
王旭
蔡伯清
石忠宁
任如山
PENG Junjun;WANG Xu;CAI Boqing;SHI Zhongning;REN Rushan(Faculty of Material Metallurgical and Chemistry,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China;School of Metallurgy,Northeastern University,Shenyang 110006,China)
出处
《有色金属科学与工程》
CAS
北大核心
2024年第2期189-194,共6页
Nonferrous Metals Science and Engineering
基金
国家自然科学基金资助项目(52074134
51864018)
江西省教育厅科技项目(GJJ180437)。
关键词
熔盐
密度
阿基米德法
摩尔体积
过剩体积
molten salt
density
Archimedes method
molar volume
excess volume
