Thermodynamic properties and vaporization processes of the ionic silicate melts
Advantages of high temperature mass spectrometric method to study thermodynamic properties and vaporization processes of the ionic silicate melts up to the temperature 2500 K are illustrated. Information on the vaporization processes and thermodynamic properties of binary and multicomponent silicate systems containing Na2O, Cs2O, Rb2O, MgO, CaO, SrO, BaO, PbO, ZnO, B2O3, Al2O3 and TiO2, obtained by high temperature mass spectrometric method is discussed. Various types of vapour species were found over these silicate melts studied such as the associated, dissociated and polymerized products of vaporization. It was shown that the content of vapour over multicomponent silicate systems was in agreement with the composition of the gaseous phase over the corresponding binary systems. The regularities of the vaporization of corresponding binary and multicomponent silicate systems according to the position of oxide modifier in the Periodic table of atoms were also illustrated and discussed from the point of view of the acid-base concept. Results on determination of thermodynamic functions in the ionic silicate systems mentioned were considered taking into account the main requirements for the confirmation of their reliability. Thermodynamic functions of these systems showed various signs of the deviations from the ideal behaviour. For modeling of these thermodynamic properties of the ionic silicate melts studied the ideal associated solution model and the general lattice theory of associated solutions were used. Using these approaches the different levels of deviation from the ideality in the silicate melts studied were clarified.
Silicate melts vaporization thermodynamics high temperature mass spectrometry
Valentina STOLYAROVA
Dept. of Chemistry, Saint Petersburg State University, 198504, Russia
国际会议
Ninth International Conference on Molten Slags,Fluxes and Salts(第九届国际熔渣、溶剂与熔盐学术会议 MOLTEN12)
北京
英文
1-14
2012-05-27（万方平台首次上网日期，不代表论文的发表时间）