摘要
明确Pr_(6)O_(11)在LiF-PrF_(3)熔盐中溶解度及溶解机制是镨电解生产过程中,建立合适加料制度、提高电解效率的关键。采用等温饱和法研究了Pr_(6)O_(11)在LiF-PrF_(3)熔盐中的溶解度与溶解平衡时间,考察了温度、PrF_(3)含量对Pr_(6)O_(11)溶解度的影响,并通过物相分析、热分析法对Pr_(6)O_(11)在LiF-PrF_(3)熔盐的溶解行为进行了探讨。研究结果表明,Pr_(6)O_(11)在LiF-PrF_(3)熔盐中溶解平衡的时间为7 h,溶解过程为吸热过程,在温度为1223~1323 K,PrF_(3)含量为70%~90%范围内,Pr_(6)O_(11)在熔盐中的溶解度为0.23%~3.29%,且升高温度、增加熔盐中PrF_(3)含量均会使Pr_(6)O_(11)溶解度增大;Pr_(6)O_(11)溶解于熔盐过程中,与LiF-PrF_(3)熔盐发生反应生成了PrOF与Li_(2)PrF_(6)。
Determining the solubility and dissolution mechanism of Pr_(6)O_(11) in LiF-PrF_(3) molten salts is crucial for establishing an appropriate feeding system and improving electrolysis efficiency in the production of praseodymium.The solubility of Pr_(6)O_(11) in LiF-PrF_(3) melts and the equilibrium time for dissolution were investigated using an isothermal saturation method.The effects of temperature and PrF_(3) content on the solubility of Pr_(6)O_(11) were examined,and the dissolution behavior of Pr_(6)O_(11) in LiF-PrF_(3) molten salts was explored through phase and thermal analysis.The results show that the equilibrium time for the dissolution of Pr_(6)O_(11) in LiF-PrF_(3) molten salts is 7 h,and the dissolution reaction is endothermic.At temperatures ranging from 1223 and 1323 K and with PrF_(3) content between 70%to 90%,the solubility of Pr_(6)O_(11) in the molten salts ranges from 0.23%to 3.29%.Additionally,as the temperature increases and the PrF_(3) content in the molten salt rises,the solubility of Pr_(6)O_(11) increases.During the dissolution process,Pr_(6)O_(11) reacts with the LiF-PrF_(3) molten salts to form PrOF and Li_(2)PrF_(6).
作者
彭栩堃
赖晨妍
陈淑梅
廖春发
李立清
谭明阳
江超
焦芸芬
Peng Xukun;Lai Chenyan;Chen Shumei;Liao Chunfa;Li Liqing;Tan Mingyang;Jiang Chao;Jiao Yunfen(School of Metallurgical Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China)
出处
《中国稀土学报》
北大核心
2026年第1期52-58,共7页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金项目(52204360)
江西省教育厅项目(GJJ210809)
江西省自然科学基金重点项目(20224ACB203010)资助。
关键词
熔盐电解
等温饱和法
溶解度
LiF-PrF_(3)熔盐
稀土
molten salt electrolysis
dissolution equilibrium time
solubility
LiF-PrF_(3)molten salt
rare earths
