A. O. Khudorozhkova, A. V. Isakov, A. A. Kataev, A. A. Redkin, Yu. P. Zaykov.
ABSTRACT
The densities of KF–KCl–KI melts at a molar ratio of KF/KCl of 0.8 and 2, depending on the KI content, were measured using the hydrostatic weighing method. The measurements were carried out in an inert atmosphere using structural materials resistant to the studied melts. The density of melts (45 mol. % KF–55 mol % KCl)–KI and (66 mol % KF–34 mol % KCl)–KI with a KI content from 0 to 100% in the temperature range 973–1073 K was measured. It was established that the addition of potassium iodide to the KF – KCl melt leads to an increase in density. The temperature dependences of the density of the melts were described using linear functions. It was revealed that KI increases the coefficient of the temperature dependence of density. Density data for KF–KCl–KI melts were used to calculate molar volumes. Dependences of changes in molar volume on temperature and composition of melts are presented. It was found that the molar volumes of the studied melts are close to the values calculated by the additivity rule, which indicates that the starting salts are mixed together without noticeable chemical interaction.
KEYWORDS
salt melts, density, molar volume, potassium fluoride, potassium chloride, potassium iodide
DOI:10.31857/S0235010620030044