摘要
以NH_(4)HF_(2)､Sc_(2)O_(3)为原料,对干法氟化制备氟化钪的反应机理进行研究,通过SEM对粉末粒径进行分析,XRD对产物进行物相分析,DSC对产物进行热性能分析,试验结果表明,反应中有中间产物(NH_(4))_(3)ScF_(6)生成,且反应机理可分为两部分,一是NH_(4)HF2､Sc_(2)O_(3)在混料阶段发生预氟化反应生成中间产物(NH_(4))_(3)ScF_(6),(NH_(4))_(3)ScF_(6)在氟化炉中受热分解生成ScF_(3);二是预氟化阶段未反应的NH_(4)HF_(2)在氟化炉中受热分解,生成NH_(3)和HF,Sc_(2)O_(3)与HF氟化生成ScF_(3)。
Dry fluorination reaction mechanism of Sc_(2)O_(3)and NH_(4)HF_(2)was investigated.The particle size,phase analysis,thermal performance was analyzed by SEM,XRD and DSC,respectively.The results showed that the intermediate product(NH_(4))_(3)ScF_(6) was generated in the reaction,and the reaction mechanism could be divided into two parts.First,the pre-fluorination reaction of NH_(4)HF_(2)and Sc_(2)O_(3)produced intermediate product(NH_(4))_(3)ScF_(6) during mixing,and(NH_(4))_(3)ScF6 was heated in the fluorination furnace to decompose into ScF_(3).Second,the unreacted NH_(4)HF_(2)during pre-fluorination was heated in the fluorination furnace.It decomposed into NH_(3)and HF,then Sc_(2)O_(3)and HF were fluorinated to generate ScF_(3).
作者
张闻扬
黄培
黄美松
刘华
杨志强
ZHANG Wen-yang;HUANG Pei;HUANG Mei-song;LIU Hua;YANG Zhi-qiang(Hunan Rare Earth Metal Material Institute Co.,Ltd.,Changsha 410126,China;Hunan Key Laboratory for Rare Earth Functional Materials,Changsha 410126,China)
出处
《湖南有色金属》
2022年第2期41-43,共3页
Hunan Nonferrous Metals
基金
湖南省科技创新计划项目(2017 TP1031)。
关键词
干法氟化
中间产物
反应机理
dry fluorination
intermediate product
reaction mechanism
