强化沉淀反应结晶过程制备纳米稀土氧化物的工艺开发  

Technology Development of Preparation of Nanometer Rare Earth Oxides by Chemical Enhanced Process in Precipitation Crystallization

作　　者：田皓[1] 崔建国[1] 王荣[1] 高婷 陈禹夫 张洋 Tian Hao;Cui Jianguo;Wang Rong;Gao Ting;Chen Yufu;Zhang Yang(State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization,Baotou Research Institute of Rare Earth,State Engineering Research Centre of Rare Earth Metallurgy and Functional Materials,Baotou 014030,China)

机构地区：[1]白云鄂博稀土资源研究与综合利用国家重点实验室,包头稀土研究院,稀土冶金及功能材料国家工程研究中心,内蒙古包头014030

出　　处：《中国稀土学报》2020年第4期467-473,I0001,共8页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金重点项目(51634005);内蒙古自然科学基金重大项目(2016ZD03);中国北方稀土课题项目(BFXT2017D0008)资助。

摘　　要：采用液相沉淀法以CeCl3为铈源,NH4HCO3为沉淀剂,快速反应生成无定形沉淀,再引入较低压力和温度的强化条件,制备出晶型完整、分散性良好的球形纳米稀土氧化物。利用X射线衍射、扫描电子显微镜、粒度分析和热重-差热分析等测试方法对晶相组成、晶体粒度、形貌特征和热分解过程进行了研究,推测出化学反应原理并分析了晶体的形成过程。结果表明:在不使用分散剂条件下,通过晶型转变的控制能够获得符合市场需求的纳米球形稀土氧化物,该工艺容易进行工业推广。This paper researched the preparation technology of nanometer rare earth oxides.Amorphous precursors were synthesized by liquid phase precipitation with cerium chloride as cerium sources and ammonium bicarbonate as precipitant in a short time.Spherical nanometer rare earth oxides with good crystal and homogeneous dispersion were prepared via lower pressure and temperature in chemical process.Crystal phase structure,powder particle size,morphology features and thermal-decomposition process were studied by means of X-ray diffraction(XRD),scanning electron microscope(SEM),differential thermal/thermo-gravimetric analyzer(TG-DTA)and particle size measurement.According to the analysis results,the principle of chemical reaction and the formation process of crystal were deduced.The results showed that nano spherical rare earth oxides met the market demand can be prepared by controlling of crystal transfer without dispersant.Furthermore this process is easy to be applied in industry.

关 键 词：纳米稀土氧化物 无定形 晶体 制备 表征 

分 类 号：O614.33[理学—无机化学]