Saturation vapour pressure and thermodynamic properties of potassium solutions in molten binary mixtures of its halides

✍ Scribed by M.V. Smirnov; V.M. Ivenko

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 731 KB
• Volume: 35
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(90)87040-9

✦ Synopsis

The saturation vapour pressure of potassium solutions in molten binary mixtures of KF + KCl, KF + KBr, KF + KI, KC1 + KI with molar ratios of their components being 39, 1: 1, 1:3, and in equimolar mixtures of KCI+KBr and KBr+ KI was measured as a function of temperature and the metal concentration by a statistical method. A device with a sylphon zero-manometer was used, the gas space of which was minimized to reduce changes in the composition of the melts caused by the evaporation of their components. Potassium partial pressure was determined. It deviates from additive quantities towards greater values. The deviations grow as the molar ratio of lighter and heavier halide anions replacing each other in the melts increases. The potassium activity coefficient calculated from experimental data as a function of temperature and the composition of the melts is much greater than unity. It diminishes as the metal concentration and the molar fraction of the heavier salt components are raised. Potassium partial excess Gibbs energy was computed for all the melts under study.