La_(2)O_(3)在LaF_(3)-LiF熔盐体系的溶解度研究  

Solubility of La_(2)O_(3) in LaF_(3)-LiF Fluoride Molten Salts

作　　者：梁鑫 陈淑梅[1,2] 洪侃 陈东英[1] 李忠岐[1] 赖耀斌[1] 徐建兵[1] Liang Xin;Chen Shumei;Hong Kan;Chen Dongyin;Li Zhongqi;Lai Yaobing;Xu Jianbin(Ganzhou Nonferrous Metallurgy Research Institute,Ganzhou 341000,China;School of Metallurgical and Chemical Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China)

机构地区：[1]赣州有色冶金研究所冶金研究室,江西赣州341000 [2]江西理工大学材料冶金化学学部,江西赣州341000

出　　处：《中国稀土学报》2021年第4期594-600,共7页Journal of the Chinese Society of Rare Earths

基　　金：江西省重点研发项目(20192BBE50027)资助。

摘　　要：La_(2)O_(3)溶解度对熔盐电解制备金属La及其合金有重要影响。利用等温饱和法考察了LaF_(3)含量、温度对La_(2)O_(3)在LaF_(3)-LiF熔盐体系中溶解度的影响,并采用最小二乘法对数据进行了分析,建立了LaF_(3)含量、温度与La_(2)O_(3)溶解度之间的数学回归方程。研究结果表明:La_(2)O_(3)溶解度与温度、LaF_(3)含量均为正向性线性关系,随温度的升高而线性增大;在合适的温度下,随熔盐中LaF_(3)含量的升高而线性增大;La_(2)O_(3)溶解度(S)与温度(t)、LaF_(3)含量(ω)的关系可以表示为:S=1×10^(-4)ω·t-0.085ω-0.003t+3.60(ω≤75%),通过此方程计算不同温度、体系下La_(2)O_(3)溶解度,对电解法生产金属La有一定指导意义。The solubility of La_(2)O_(3) plays an important role in the preparation of lanthanum and lanthanum alloys by molten salt electrolysis. The influence of LaF_(3) content and temperature on the solubility of La_(2)O_(3) in LaF_(3)-LiF molten salt system was studied by isothermal saturation method. The mathematical regression equation of La_(2)O_(3) solubility between LaF_(3) content and temperature by the least square method. The results indicated that: in the LaF_(3)-LiF molten salt, the solubility of La_(2)O_(3) increases linearly with the increase of temperature and LaF_(3) content. It increases linearly with the increase of temperature, and increases linearly with the increase of LaF_(3) content in molten salt at a suitable temperature;the relationship of La_(2)O_(3)(S) between the temperature(t) and LaF_(3) content(ω) is: S=1×10^(-4)ω·t-0.085ω-0.003t+3.60(ω≤75%). This equation can be used to calculate the solubility of La_(2)O_(3) on different temperatures and systems. The equation would be guide significance for the production of lanthanum metal by electrolysis.

关 键 词：La_(2)O_(3) LaF_(3)-LiF 溶解度 熔盐 数学模型 

分 类 号：TF845.6[冶金工程—有色金属冶金]