Theoretical and Experimental Research on the Purification of Metal Ytterbium by Vacuum Distillation
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℃ .
万方数据
维普
