摘要
采用镧热还原蒸馏法对蒸气压较高的稀土元素Sm、Yb和Tm的制备进行了研究,制得了纯度达4N级的稀土金属Sm和Yb,其纯度分别为99.99%和99.993%(质量分数,相对75种杂质元素);对于稀土金属Tm,由于还原温度较高,还原蒸馏产物中La的含量偏高,需要对其进行低温、高真空升华提纯,提纯后纯度达到99.995%(同上)。结果表明,高纯度还原剂La的制备,尤其是La中金属杂质总量的控制,是获得99.99%纯度Sm、Yb和Tm的关键步骤。
High purity rare earth metals, including samarium, ytterbium and thulium, were prepared by vacuum reduction-distillation of each rare earth oxide with lanthanum metal. The results show that the rare earth metals of samarium and ytterbium with 4N-purity are obtained by direct vacuum reduction-distillation, and their purity is 99.99 wt% and 99.993 wt%, respectively, with respect to 75 impurities. There is a high concentration of reductant in thulium metal due to the higher reaction temperature and lower distillation velocity ratio of metallic thulium to lanthanum, so that the sublimation purification with lower temperature and high vacuum is needed. The purified thulium can reach a high purity of 99.995wt% with respect to 75 impurities. Therefore, the preparation of high purity reductant of lanthanum metal, especially of total amount control of metallic impurities, is the key step to obtain 99.99%-purity rare earth metallic samarium, ytterbium and thulium.
作者
张小伟
王志强
陈德宏
李宗安
苗睿瑛
颜世宏
Zhang Xiaowei Wang Zhiqiang Chen Dehong Li Zongan Miao Ruiying Yan Shihong(General Research Institute for Nonferrous Metals, Grirem Advanced Materials Co. LTD., Beijing 100088, China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2016年第11期2793-2797,共5页
Rare Metal Materials and Engineering
基金
National Basic Research Program of China(2012CBA01207)
National High Technology Research and Development Program of China(2011AA03A409)
关键词
真空还原蒸馏
高纯稀土金属
钐
镱
铥
vacuum reduction-distillation
high purity rare earth metals
samarium
ytterbium
thulium
作者简介
张小伟，男，1982年生，博士，高级工程师，北京有色金属研究总院，北京100088，电话：010-82241180，E-mail：0420295@163．com
