摘要
采用一种喷雾造粒-氟化-焙烧的技术路线制备球形氟氧化钇粉体。利用扫描电子显微镜(SEM)、X射线衍射(XRD)、热重差示扫描量热法(TG-DSC)对样品的微观形貌、物相、受热时发生重量的变化等进行表征,用Flynn-Wal1-Ozawa(FWO)法求出生成YOF反应的活化能。结果表明,在喷雾造粒-氟氧化过程中氢氧化钇转变氟氧化钇;在焙烧过程中,YF_(3)与O_(2)发生氧化转型,物相转变过程表达为YF_(3)→Y_(5) O_(4) F_(7)→YOF;确定了氢氧化钇前驱体最佳热处理温度为200℃,氟化后氧化转型最佳焙烧温度为800℃,制备的氟氧化钇粉体分散性好,为微米级多孔球形。
Spherical yttrium oxyfluoride powder was prepared by a spray granulation fluorination calcination process.Scanning Electron Microscopy(SEM),X-ray diffraction(XRD)and thermogravimetry differential thermal analysis(TG-DSC)were used to characterize the micro morphology,phase and weight changes of the samples when heated.The activation energy of YOF reaction was calculated by Flynn-Wal1-Ozawa(FWO)method.The results show that yttrium hydroxide is transformed into yttrium fluoride in the process of spray granulation fluorination;During roasting,YF_(3) and O_(2) undergo oxidative transformation,and the phase transformation process is expressed as YF_(3)→Y_(5) O_(4) F_(7)→YOF;The optimum heat treatment temperature of yttrium hydroxide precursor is 200℃,and the optimum roasting temperature of oxidation transformation after fluorination is 800℃.The prepared yttrium fluoride powder has good dispersion and is micron porous spherical.
作者
陶博
谢紫玉
钟佐华
胡佳乐
刘宇
杨幼明
张小林
TAO Bo;XIE Ziyu;ZHONG Zuohua;HU Jiale;LIU Yu;YANG Youming;ZHANG Xiaolin(Faculty of Materials Metallurgy Chemistry,Jiangxi University of Science and Technology,Ganzhou 341000,China;National Engineering Technology Research Center for Efficient Development and Utilization of Ionic Rare Earth Resources,Ganzhou 341000,China)
出处
《有色金属工程》
CAS
北大核心
2022年第12期1-7,共7页
Nonferrous Metals Engineering
基金
国家自然科学基金资助项目(51774155)
江西省教育厅科学技术研究项目(GJJ210839)
江西理工大学博士科研基金(205200100515)。
关键词
氟氧化钇
物相变化
喷雾造粒
动力学
yttrium oxyfluoride
phase change
spray granulation
dynamics
