工业上采用NaCl-KCl熔盐体系提纯粗四氯化锆过程中,夹杂物在熔盐体系中富集,造成NaCl-KCl熔盐体系的恶化。利用旋转法、拉筒法和阿基米德原理研究了粗四氯化锆中主要夹杂物二氧化锆对NaCl-KCl熔盐体系表面张力、黏度和密度的影响。结果表明,在660~740 ℃,二氧化锆含量一定的熔盐体系的表面张力随温度的增加而减小,黏度受温度影响较大,当二氧化锆质量分数为0%、10%、15%、20%时密度与温度无关,但当二氧化锆质量分数为5%时,密度受温度的影响较大;温度一定时,熔盐表面张力随二氧化锆含量的增加先保持稳定后迅速减小,黏度随二氧化锆含量的增加逐渐增加,密度随二氧化锆含量的增加先增大后减小随后保持稳定不变。

In the process of industrial purification of crude zirconium tetrachloride by using NaCl-KCl molten salt system,in-clusions are enriched in the molten salt system,causing the deterioration of the NaCl-KCl molten salt system.The effect of the main inclusion ZrO₂on the surface tension,viscosity and density of the NaCl-KCl molten salt system was studied by using the rotation method,the pull tube method and Archimedes principle.The results showed that the surface tension of molten salt system with a certain ZrO₂ content decreased with the increase of temperature between 660~740 ℃,and the viscosity was greatly affected by temperature.When the mass content of ZrO₂ was 0%,10%,15% and 20%,the density was independent of temperature,but when the mass content of ZrO₂ was 5%,the density was greatly affected by temperature.When the tempera-ture is constant,the surface tension of molten salt firstly remained stable and then rapidly decreased with the increase of ZrO₂ content;the viscosity gradually increased with the increase of ZrO₂ content;the density increased firstly and then decreased with the increase of ZrO₂ content and then remained stable and unchanged.