Ferrous Oxide Activity in FeO-TiO_2-CaO-Al_2O_3 System

摘要

Ferrous oxide activity has been determined in molten synthetic slag mixtures of the quaternary system FeO-TiO_2-CaO-Al_2O_3 at constant levels of Al_2O_3. Furthermore, in the course of determining the FeO activity in this quaternary system, the ternary system FeO-CaO-Al_2O_3 was also investigated at 1 450℃. The technique used to measure the ferrous oxide activity in the investigated systems was the well established one of gas-slag-metal equilibration in which molten slags contained in armco iron crucibles are exposed to a flowing gas mixture with a known oxygen potential until equilibrium has been attained. After equilibration, the final chemical analysis of the slags give compositions having a particular ferrous oxide activity corresponding to the oxygen potential of the gas mixture. The effect of Al_2O_3 additions on the FeO activity was determined. The results are presented as a series of iso-activity curves on pseudo-ternary diagrams. The interdependence between the ferrous oxide activities and slag composition was also studied.