Numerical simulation during vacuum sublimation purification of metal Tm (I): model foundation and validation  

作　　者：张小伟 苗睿瑛 陈德宏 王志强 李宗安 颜世宏 金小礼 

机构地区：[1]General Research Institute for Nonferrous Metals,Grirem Advanced Materials Co. Ltd. [2]School of Materials Science and Engineering,Shanghai University

出　　处：《Journal of Rare Earths》2013年第2期180-185,共6页稀土学报（英文版）

基　　金：Project supported by National Hi-Tech R&D Program of China(863Program,2011AA03A409);Major State Basic Research Development Program of China(973Program,2012BA01207)

摘　　要：The thermo physical parameters of Tm vapor and the range of sublimation temperature were determined by vapor pressure of metal Tm, and a 2-D axis-symmetric heat transfer model was developed to investigate the temperature distribution in sublimation furnace. The simulation results showed that, due to the heat loss at crucible bottom, the temperature of crucible, solid metal and Tm vapor increased with crucible height increasing, reached the maximum value in the middle of crucible in height direction, and then decreased rapidly; at the outside surface of condenser, the temperature decreased sharply; with heating body temperature of 1000oC, the mean temperature at upper surface of solid Tm was 22oC higher than that on the lower surface, the mean temperature of upper surface of solid Tm was about 32oC lower than that of heating body, and the calculated sublimation velocity was 8.16g/cm2/h, which was only 54.4% of sublimation velocity calculation by heating body temperature.The thermo physical parameters of Tm vapor and the range of sublimation temperature were determined by vapor pressure of metal Tm, and a 2-D axis-symmetric heat transfer model was developed to investigate the temperature distribution in sublimation furnace. The simulation results showed that, due to the heat loss at crucible bottom, the temperature of crucible, solid metal and Tm vapor increased with crucible height increasing, reached the maximum value in the middle of crucible in height direction, and then decreased rapidly; at the outside surface of condenser, the temperature decreased sharply; with heating body temperature of 1000oC, the mean temperature at upper surface of solid Tm was 22oC higher than that on the lower surface, the mean temperature of upper surface of solid Tm was about 32oC lower than that of heating body, and the calculated sublimation velocity was 8.16g/cm2/h, which was only 54.4% of sublimation velocity calculation by heating body temperature.

关 键 词：vacuum sublimation Tm vapor temperature field numerical simulation 

分 类 号：TF845[冶金工程—有色金属冶金]