Dy_(2)O_(3),Cu_(2)O在LiF-DyF_(3)熔盐体系的溶解度研究  

Solubility of Dy_(2)O_(3)and Cu_(2)O in LiF-DyF_(3)Molten Salt System

作　　者：陈淑梅 廖春发[1] 焦芸芬[1] 伍昕宇 王旭[1] 蔡伯清 Chen Shumei;Liao Chunfa;Jiao Yunfen;Wu Xinyu;Wang Xu;Cai Boqing(Institute of Metallurgy and Chemical Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China)

机构地区：[1]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》2023年第2期347-354,共8页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金项目(52204360);江西省离子型稀土资源绿色开发与高值利用国家重点实验室培育计划项目(20194AFD44003);江西理工大学高层次人才科研专项项目资助。

摘　　要：以LiF-DyF_(3)为熔盐,电解Dy_(2)O_(3),Cu_(2)O制备Dy-Cu合金过程中,明确Dy_(2)O_(3),Cu_(2)O溶解度是制定合理加料制度、提高电解效率的关键。采用等温饱和法研究了Dy_(2)O_(3),Cu_(2)O溶解平衡时间,考察了温度、DyF_(3)浓度对单一氧化物(Dy_(2)O_(3)或Cu_(2)O)及混合氧化物(Dy_(2)O_(3)与Cu_(2)O)溶解度的影响,通过最小二乘法对溶解度数据进行了拟合,建立了温度、DyF_(3)浓度与Dy_(2)O_(3),Cu_(2)O溶解度之间的数学回归方程。研究结果表明,Dy_(2)O_(3),Cu_(2)O在LiF-DyF_(3)熔盐中溶解平衡的时间分别为110,120 min,溶解反应为吸热反应。相同温度下,随熔盐中DyF_(3)浓度增大,Dy_(2)O_(3)的溶解度逐渐增大,Cu_(2)O溶解度变化较小;在温度为910~1030℃,熔盐中DyF_(3)浓度为15%~40%(摩尔分数)时,Dy_(2)O_(3),Cu_(2)O溶解度分别为0.55%~3.45%,0.39%~0.52%。In the process of preparing Dy-Cu alloy by electrolysis of Dy_(2)O_(3)and Cu_(2)O with LiF-DyF_(3)as molten salt,clarifying the solubility of Dy_(2)O_(3)and Cu_(2)O is the key to formulate reasonable feeding system and improve electrolysis efficiency.In this paper,the dissolution equilibrium time and solubility of Dy_(2)O_(3)and Cu_(2)O were determined by isothermal saturation method.The effects of temperature and DyF_(3)concentration on the solubility of single oxide(Dy_(2)O_(3)or Cu_(2)O)and mixed oxide(Dy_(2)O_(3)and Cu_(2)O)were investigated.The mathematical regression equation between temperature,DyF_(3)concentration and the solubility of Dy_(2)O_(3)and Cu_(2)O was established by least-squares fitting data.The results show that the dissolution equilibrium time of Dy_(2)O_(3)and Cu_(2)O in LiF-DyF_(3)molten salt is 110 and 120 min,respectively.The dissolution reaction is endothermic reaction.At the same temperature,the solubility of Dy_(2)O_(3)gradually increases with the increase of the concentration of DyF_(3)in the molten salt,while the solubility of Cu_(2)O changes little.When the temperature is from 910 to 1030℃and the molar concentration of DyF_(3)in the molten salt is from 15%to 40%,the solubility values of Dy_(2)O_(3)and Cu_(2)O are 0.55%~3.45%and 0.39%~0.52%,respectively.

关 键 词：熔盐 溶解平衡时间 溶解度 Dy_(2)O_(3) Cu_(2)O 

分 类 号：TF845[冶金工程—有色金属冶金]