Numerical simulation during vacuum sublimation purification of metal Tm(Ⅱ):Effect of Operation Conditions
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- 英文论文题名：Numerical simulation during vacuum sublimation purification of metal Tm(Ⅱ):Effect of Operation Conditions
- 论文作者：Xiao-wei ZHANG ; Qiong ZHU ; Rui-ying MIAO ; Dao-gao WU ; De-hong CHEN ; Zhi-qiang WANG ; Shi-hong YAN
- 英文论文作者：Xiao-wei ZHANG ; Qiong ZHU ; Rui-ying MIAO ; Dao-gao WU ; De-hong CHEN ; Zhi-qiang WANG ; Shi-hong YAN ; National Engineering Research Center for Rare Earth Materials ; General Research Institute for Nonferrous Metals ; and Grirem Advanced Materials Co.LTD.
- 年：2016
- 作者机构：National Engineering Research Center for Rare Earth Materials,General Research Institute for Nonferrous Metals,and Grirem Advanced Materials Co.LTD.;
- 英文论文关键词：sublimation purification ; numerical simulation ; meal Tm ; temperature field ; sublimation velocity
- 会议召开时间：2016-09-06
- 会议录名称：2016全国稀土冶炼与环境保护技术交流会会刊
- 语种：英文
- 分类号：TF845
- 学会代码：ZGXT
- 会议名称：2016全国稀土冶炼与环境保护技术交流会
- 会议地点：中国广西南宁
- 主办单位：中国稀土学会环境保护专业委员会、中国稀土学会化学和湿法冶金专业委员会、中国稀土学会火法冶金专业委员会
- 学会名称：中国稀土学会
- 页数：7
- 文件大小：696k
- 原文格式：O
- 会议级别：全国
摘要
Two important operating parameters of heater temperature and the thickness of solid metal Tm has been considered,and the temperature distribution in the sublimation furnace has been simulated by a 2-D axis-symmetric heat transfer model.The simulation results indicate that,the temperature increases gradually in the solid metal and metallic vapor in the lower part of the crucible,reaches the maximum approximately in the middle of the crucible,and the temperature profiles are similar with various heater temperature;the mean temperature at upper surface of solid metal is about 30℃ lower than heater temperature in the beginning of sublimation purification process,the sublimation velocity calculated by simulation is lower than the value calculated by heater temperature,and the dimensionless ratio increases 54.3%to 83.3%with the heater temperature increasing;as the purification continues,the thickness of solid metal decreases correspondingly,the temperature difference of mean temperature at upper surface of solid metal to the heater temperature increases gradually,the maximum temperature difference is up to 98.4 ℃ when the heater temperature is1400℃ and thickness is 10 mm;the temperature difference between the upper and lower surface of solid metal increases with the heater temperature increasing,and it decreases as the sublimation purification continues,it decreases the range of 2.1-5.3℃ when the thickness is 10 mm;the sublimation velocity calculated by simulation results is lower than that calculated by the heater temperature,and it further decreases with the sublimation purification.
Two important operating parameters of heater temperature and the thickness of solid metal Tm has been considered,and the temperature distribution in the sublimation furnace has been simulated by a 2-D axis-symmetric heat transfer model.The simulation results indicate that,the temperature increases gradually in the solid metal and metallic vapor in the lower part of the crucible,reaches the maximum approximately in the middle of the crucible,and the temperature profiles are similar with various heater temperature;the mean temperature at upper surface of solid metal is about 30℃ lower than heater temperature in the beginning of sublimation purification process,the sublimation velocity calculated by simulation is lower than the value calculated by heater temperature,and the dimensionless ratio increases 54.3%to 83.3%with the heater temperature increasing;as the purification continues,the thickness of solid metal decreases correspondingly,the temperature difference of mean temperature at upper surface of solid metal to the heater temperature increases gradually,the maximum temperature difference is up to 98.4 ℃ when the heater temperature is1400℃ and thickness is 10 mm;the temperature difference between the upper and lower surface of solid metal increases with the heater temperature increasing,and it decreases as the sublimation purification continues,it decreases the range of 2.1-5.3℃ when the thickness is 10 mm;the sublimation velocity calculated by simulation results is lower than that calculated by the heater temperature,and it further decreases with the sublimation purification.
Two important operating parameters of heater temperature and the thickness of solid metal Tm has been considered,and the temperature distribution in the sublimation furnace has been simulated by a 2-D axis-symmetric heat transfer model.The simulation results indicate that,the temperature increases gradually in the solid metal and metallic vapor in the lower part of the crucible,reaches the maximum approximately in the middle of the crucible,and the temperature profiles are similar with various heater temperature;the mean temperature at upper surface of solid metal is about 30℃ lower than heater temperature in the beginning of sublimation purification process,the sublimation velocity calculated by simulation is lower than the value calculated by heater temperature,and the dimensionless ratio increases 54.3%to 83.3%with the heater temperature increasing;as the purification continues,the thickness of solid metal decreases correspondingly,the temperature difference of mean temperature at upper surface of solid metal to the heater temperature increases gradually,the maximum temperature difference is up to 98.4 ℃ when the heater temperature is1400℃ and thickness is 10 mm;the temperature difference between the upper and lower surface of solid metal increases with the heater temperature increasing,and it decreases as the sublimation purification continues,it decreases the range of 2.1-5.3℃ when the thickness is 10 mm;the sublimation velocity calculated by simulation results is lower than that calculated by the heater temperature,and it further decreases with the sublimation purification.
引文
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[3]Jiang Y J,Hao Z Z,Dai Q,Yang J Y,Zhang X Q,Qiu D M.Measurement and theoretical computation of the distillation rate of metallic terbium[J].Rare earth(in Chin),1999,20(6):11.
[4]Jiang Y J,Hao Z Z,Zhang X Q,Dai Q.Discussion on the factors affecting purification of rare earth metals by vacuum distillation[J].Rare earth(in Chin),2003,24(4):60.
[5]Zhang X Q,Jiang Y J,Dai Q.Preparation of highpurity matallic gadolinium by the vacuum distillation method[J].Sciences Technology of Baotou Steel(Group)Corporation(in Chin),2007,33(3):17.
[6]Li G D,Liu Y L.Study on technology and optimization of purifying scandium metal by vacuum distillation method[J].Journal of Chinese Society of Rare Earth(in Chin),2000,18(2):183.
[7]Zhang Z Q,Wang Z Q,Chen D H,Miao R Y,Zhu Q,Zhang X W,Zhou L,Li Z A.Purification of praseodymium to 4N5+purity[J].Vacuum,2014,102:67.
[8]lonov A M,Nikiforova T V,Rytus N N.Aspects of the purification of volatile rare earth metals by UHV sublimation:Sm,Eu,Tm,Yb[J].Vacuum,1996,47(6-8):879.
[9]Chen X H,Xie L Y,Liu B S,Qiao W H.Distribution of temperature field in the process of reduction-distillation during the thermal reduction of Sm203 with La metal[J].Rare earth(in Chin),2007,28(3):82.
[10]Zhang X W,Wang Z Q,Miao R Y,Li Z A,Jin X L.Numerical simulation of temperature field in vacuum sublimation of rare earth metals Tm(Ⅰ)[J].Journal of Rare Earths,2013,31(2):180.