Purification of High Purity Pr by Electron Beam Refining
详细信息 查看官网全文
- 英文论文题名：Purification of High Purity Pr by Electron Beam Refining
- 论文作者：Qiong Zhu ; Ruiying Miao ; Zhiqiang Wang ; Xiaowei Zhang ; Dehong Chen ; Lin Zhou ; Zongan Li
- 英文论文作者：Qiong Zhu ; Ruiying Miao ; Zhiqiang Wang ; Xiaowei Zhang ; Dehong Chen ; Lin Zhou ; Zongan Li ; General Research Institute for Nonferrous Metals ; National Engineering Research Center for Rare Earth Materials
- 年：2016
- 作者机构：General Research Institute for Nonferrous Metals,National Engineering Research Center for Rare Earth Materials;
- 英文论文关键词：praseodymium ; electron beam melting ; high purity ; removal impurities
- 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：6
- 文件大小：711k
- 原文格式：O
- 会议级别：全国
摘要
In this paper,electron-beam furnace was used to purify 99.8%industrial pure praseodymium.It studied the effect of melting parameters of the electron beam such as different power and melting time on the impurities extraction,and analyzed the distribution of the impurity element in the praseodymium ingot.The results show that the purities of praseodymium are all lower than 99.95%after purifying,and the main impurity elements Si,Ca,Mg,Fe,Mn,Al,Ni,Co,Cu,Pb,Zn,Cd and Cr were not detectable or at very lower values following the purification.The impurity ratios of Mo and W show no purification with the growth of time,otherwise,the impurity ratios illustrate increase to some extent.The elements Ti were partially removed,the higher the power and time,the better the removal efficiency of impurities.However,with time extended,Ni/NiO no longer reduces and tends to stabilized.The melt temperature was estimated by praseodymium weight loss and measured chemistry changes.Impurity ratios Ni/NiO calculated using Langmuir's equation for ideal vaporization into a vacuum are in good agreement with measured values.The segregation effect cause the solute atoms redistribute in the solid and liquid phases.The loss rate of praseodymium grows linearly with the time and power increase.
In this paper,electron-beam furnace was used to purify 99.8%industrial pure praseodymium.It studied the effect of melting parameters of the electron beam such as different power and melting time on the impurities extraction,and analyzed the distribution of the impurity element in the praseodymium ingot.The results show that the purities of praseodymium are all lower than 99.95%after purifying,and the main impurity elements Si,Ca,Mg,Fe,Mn,Al,Ni,Co,Cu,Pb,Zn,Cd and Cr were not detectable or at very lower values following the purification.The impurity ratios of Mo and W show no purification with the growth of time,otherwise,the impurity ratios illustrate increase to some extent.The elements Ti were partially removed,the higher the power and time,the better the removal efficiency of impurities.However,with time extended,Ni/NiO no longer reduces and tends to stabilized.The melt temperature was estimated by praseodymium weight loss and measured chemistry changes.Impurity ratios Ni/NiO calculated using Langmuir's equation for ideal vaporization into a vacuum are in good agreement with measured values.The segregation effect cause the solute atoms redistribute in the solid and liquid phases.The loss rate of praseodymium grows linearly with the time and power increase.
In this paper,electron-beam furnace was used to purify 99.8%industrial pure praseodymium.It studied the effect of melting parameters of the electron beam such as different power and melting time on the impurities extraction,and analyzed the distribution of the impurity element in the praseodymium ingot.The results show that the purities of praseodymium are all lower than 99.95%after purifying,and the main impurity elements Si,Ca,Mg,Fe,Mn,Al,Ni,Co,Cu,Pb,Zn,Cd and Cr were not detectable or at very lower values following the purification.The impurity ratios of Mo and W show no purification with the growth of time,otherwise,the impurity ratios illustrate increase to some extent.The elements Ti were partially removed,the higher the power and time,the better the removal efficiency of impurities.However,with time extended,Ni/NiO no longer reduces and tends to stabilized.The melt temperature was estimated by praseodymium weight loss and measured chemistry changes.Impurity ratios Ni/NiO calculated using Langmuir's equation for ideal vaporization into a vacuum are in good agreement with measured values.The segregation effect cause the solute atoms redistribute in the solid and liquid phases.The loss rate of praseodymium grows linearly with the time and power increase.
引文
[1]T.Ikeda,N.Nishikawa,N.Yamauchi,K.Miyazaki,H.Hattori,Y.Shinoda,T.Shimada,M.Maeda,in:R.Bakish(Ed.),Proceedings Electron Beam Melting and RefiningState of the Art 2000,Bakish Materials Corp,Englewood,NJ,2000,pp.143-148.
[2]A.Powell,U.Pal,J.van den Avyle,B.Damkroger,J.Szekely,Analysis of multicomponent evaporation in electron beam melting and refining of titanium alloys,Metallurgical and Materials Transactions B,1997,28(6)1227-1239
[3]J.C.S Pires,J.Otubo,A.F.B.Braga,P.R.Mei,The purification of metallurgical grade silicon by electron beam melting,Journal of Materials Processing Technology 169(2005)21-25.
[4]Katsutoshi ONO and KIM YONG HWAN,Electron Beam Melting and Refining of Niobium,ISIJ International,Vol.32(1992),No.5,pp.650-655.
[5]E.K.Ohriner,Purification of iridium by electron beam melting,Journal of Alloys and Compounds 461(2008)633-640.
[6]Walter W.Koste,Electron beam processing of interconnection structures in multi-layer ceramic modules,Metallurgical and Materials Transactions B,1971,2(3)729-731
[7]K.Vutova,V.Vassileva,E.Koleva,E.Georgieva,G.Mladenov,D.Mollov,M.Kardjiev,Investigation of electron beam melting and refining of titanium and tantalum scrap,Metallurgical and Materials Transactions B,210(2010)1089-1094
[8]Watakabe S,Suzuki K,Nishikawa K.Control of chemical compositions of Ti-6AI-4V alloy during melting by electron beam furnace.ISIJ International 1992;32:625 e9.
[9]Langmuir I,The vapor pressure of metallic tungsten,The Physical Review 1913;2:329-42.
[10]D.R.Lide,Handbook of Chemistry and Physics,83rd ed.,CRC Press,2002,pp.4-134 to 4-136 and 6-66 to 6-93.
[11]HU Gengxiang,CAI Xun,RONG Yonghua,Fundamentals of Material Science(Shanghai,Shanghai Jiaotong University Press,2006)p.267
[2]A.Powell,U.Pal,J.van den Avyle,B.Damkroger,J.Szekely,Analysis of multicomponent evaporation in electron beam melting and refining of titanium alloys,Metallurgical and Materials Transactions B,1997,28(6)1227-1239
[3]J.C.S Pires,J.Otubo,A.F.B.Braga,P.R.Mei,The purification of metallurgical grade silicon by electron beam melting,Journal of Materials Processing Technology 169(2005)21-25.
[4]Katsutoshi ONO and KIM YONG HWAN,Electron Beam Melting and Refining of Niobium,ISIJ International,Vol.32(1992),No.5,pp.650-655.
[5]E.K.Ohriner,Purification of iridium by electron beam melting,Journal of Alloys and Compounds 461(2008)633-640.
[6]Walter W.Koste,Electron beam processing of interconnection structures in multi-layer ceramic modules,Metallurgical and Materials Transactions B,1971,2(3)729-731
[7]K.Vutova,V.Vassileva,E.Koleva,E.Georgieva,G.Mladenov,D.Mollov,M.Kardjiev,Investigation of electron beam melting and refining of titanium and tantalum scrap,Metallurgical and Materials Transactions B,210(2010)1089-1094
[8]Watakabe S,Suzuki K,Nishikawa K.Control of chemical compositions of Ti-6AI-4V alloy during melting by electron beam furnace.ISIJ International 1992;32:625 e9.
[9]Langmuir I,The vapor pressure of metallic tungsten,The Physical Review 1913;2:329-42.
[10]D.R.Lide,Handbook of Chemistry and Physics,83rd ed.,CRC Press,2002,pp.4-134 to 4-136 and 6-66 to 6-93.
[11]HU Gengxiang,CAI Xun,RONG Yonghua,Fundamentals of Material Science(Shanghai,Shanghai Jiaotong University Press,2006)p.267