真空铝热还原法制备高纯金属锶工艺  

Purity Control in Producing Metallic Strontium Using Vacuum Aluminothermic Reduction

作　　者：于金[1] 吴三械[2] 李国庆[1] 董岩[1] 谈荣生[1] 朱鸣芳[1] 

机构地区：[1]东南大学材料科学与工程学院,江苏南京211189 [2]南京大学化学化工学院,江苏南京210008

出　　处：《机械工程材料》2007年第12期37-40,共4页Materials For Mechanical Engineering

基　　金：国家高技术研究发展计划资助项目(2003AA32X050)

摘　　要：对真空铝热还原法制备高纯金属锶的纯度控制进行了热力学分析;探讨了锶、钡和钙的临界还原温度、蒸气压等热力学参数差异,并制定了制备高纯金属锶的工艺。结果表明:BaO最不稳定最容易被还原,CaO最稳定最难被还原,SrO介于中间;随着温度增加,锶饱和蒸气压增大,越容易被蒸馏;在1 273 K左右,锶饱和蒸气压约为钙的2.4倍,杂质钙不容易被蒸馏提纯,而锶饱和蒸气压约为钡的28.5倍,杂质钡容易被蒸馏提纯;以优等品工业碳酸锶和Al99.80牌号纯铝为原料,优化工艺为还原温度(1 050±20)℃,气压0.01 kPa,还原15 h,可以获得高纯金属锶,w(Sr)≥99.5%,w(Ba)<0.20%,w(Ca)<0.05%。Purity control in producing metallic strontium using vacuum aluminothermic reduction was analysed by thermodynamic calculation.The differentiae of the critical reduction temperature and vapor pressure of Sr,Ba and Ca were discussed,and the purity of metallic strontium was controled.The results showed that BaO was the most unstable one to be reduced easily,CaO was the most stable one to be reduced dificultly,and SrO was in between.The vapor pressure of Sr increased with higher temperature,resulting in easy d...

关 键 词：锶 铝热还原法 真空蒸馏 提纯 

分 类 号：TF827.2[冶金工程—有色金属冶金]