摘要
采用 Miedema模型研究了真空蒸馏提纯金属镱过程中Ca、Mg、Mn等杂质的分离特性及分离规律,并根据理论分析结果开展了不同温度下镱的真空蒸馏提纯实验.计算结果表明:在1 000℃以下杂质Fe、Al、Cu、Ni与Yb的饱和蒸气压差值'p*极大,而杂质 Mg、Ca、Mn与Yb的'p*很小;随着温度降低,分离系数βCa,Yb逐渐增大,而分离系数βMg,Yb和βMn,Yb保持稳定,杂质 Mg、Ca、Mn的挥发速率急剧下降.实验结果表明,在700℃下真空蒸馏可有效去除金属镱中的杂质 Mg、Ca、Mn.
Abstract
The Miedema model was used to study the separation characteristics and rules of Ca,Mg,Mn and other impurities during the vacuum distillation purification of metal ytterbium.Based on the theoretical analysis results,vacuum distillation purification experiments of ytterbium at different temperatures were carried out.The calculation results show that the difference in saturated vapor pressure('p*)between the impurities Fe,Al,Cu,and Ni and Yb is extremely large,while the'p* between the impurities Mg,Ca,and Mn and Yb is very small below 1 000℃ .As the temperature decreases,the separation coefficient βCa,Yb gradually increases,βMg,Yb and βMn,Yb remain stable,and the volatilization rate of the impurities Mg,Ca,and Mn decreases sharply.The experimental results show that vacuum distillation can effectively remove the impurities Mg,Ca,and Mn in metal ytterbium at 700℃ .
基金项目
国家重点研发计划项目(2022YFC2905203)
湖南省十大技术攻关项目(2023GK1080)
维普
万方数据