PHASE EQUILIBRIA STUDY OF THE CaO-'Fe_2O_3'-SiO_2 SYSTEM IN AIR TO SUPPORT IRON SINTERING PROCESS OPTIMISATION

摘要

Phase equilibria studies of the CaO-Fe_2O_3-SiO_2 system in air from 1200°C to 1260°C have been carried out at Fe-rich region with particular focus on the phase chemistry of Silico-Ferrite of Calcium (SFC) phase and associated equilibria. The measurements have been made possible through the use of a modified experimental technique involving high temperature equilibration, rapid quenching followed by electron probe X-ray micro analysis (EPMA). The compositions and temperatures determining the limits of the primary phase field of the SFC phase have been determined for the first time. Isothermal sections for 1220°C, 1240°C, 1255°C and 1260°C have been measured and the liquidus in the SFC primary phase field has also been determined.