混合熔融Li2CO3-Na2CO3-K2CO3体系表面张力计算

熔融碳酸盐是一种良好的热载体和反应介质，其表面张力直接影响反应体系中熔盐分布和界面反应。在熔融盐离子半径和Butler方程的基础上，建立了熔融混合碳酸盐Li2CO3-Na2CO3-K2CO3体系的表面张力计算模型，考察了温度和熔盐组分对表面张力的影响。结果表明：模型计算的表面张力值与实际测量值比较吻合；熔融碳酸盐纯物质的表面张力随着阳离子的静电势（Z/r）的增大而逐渐减小；Li2CO3-Na2CO3-K2CO3体系中，熔盐的表面张力随着温度的升高而减小；混合熔融盐表面张力随着Li2CO3含量的增加而逐渐增大，随着K2CO3含量的增加而逐渐减小。

Evaluation of surface tension for molten Li2CO3-Na2CO3-K2CO3 system

Molten carbonate salt is a good thermal carrier and reaction medium.Surface tension directly affects the interfacial reaction and the distribution of molten salt in reaction system.On the basis of the ionic radii of the components and Butler′s equation，a calculating model is developed for determining the surface tension of the molten Li2CO3-Na2CO3-K2CO3 carbonate ternary system.The effects of temperature and composition on surface tension of molten salt were investigated.Compared with the calculated values of surface tension as well as the data available in the literature，the results showed that the present model was working well.The surface tension of the pure molten carbonate decreased with increasing the electrostatic potential of cations in molten salt.The surface tension in Li2CO3-Na2CO3-K2CO3 system increased with in increasing of the Li2CO3 content.And with the increasing of the K2CO3 content，the surface tension decreased.