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Effects of ZrO2 on the physicochemical properties of NaCl-KCl molten salt system for the purification of crude ZrCl4
Received date: 2020-08-21
Online published: 2021-07-13
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.
Yifei Hou , Ni Bai , Jian Sun , Lina Jiao , Dianchun Ju . Effects of ZrO2 on the physicochemical properties of NaCl-KCl molten salt system for the purification of crude ZrCl4[J]. Inorganic Chemicals Industry, 2021 , 53(7) : 63 -67 . DOI: 10.19964/j.issn.1006-4990.2020-0476
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