Phase Equilibria Studies in the CaO-SiO_2-Al_2O_3-MgO System with CaO/SiO_2 Ratio of 1.10

摘要

Phase equilibria and liquidus temperatures in the CaO-SiO_2-Al_2O_3-MgO system with CaO/SiO_2 weight ratio of 1.10 have been experimentally determined by means of high temperature equilibration and quenching technique followed by electron probe X-ray microanalysis. Isotherms in the interval of 20 K between 1 613 and 1 733 K were determined in the primary phase fields of dicalcium silicate, wollastonite, merwinite, periclase, spinel and melilite that are relevant to ironmaking slags. Effects of Al_2O_3, MgO and CaO/SiO_2 ratio on the liquidus temperatures have been discussed to assist optimum operation of iron blast furnace. Compositions of the solid solutions corresponding to the liquidus have been accurately measured that will be used for development of the thermodynamic database.