Oxygen Equilibrium and the Solubility of MgO in CaO-Fe_tO-MgO-SiO_2(<5mass%)-?M_xO_y Slags and Molten Iron

摘要

Oxygen equilibrium and the solubility of MgO have been measured in the CaO-Fe_tO-MgO-SiO_2 (<=5 mass%)-?M_xO_y slag in equilibrium with liquid iron in the temperature range of 1550 to 1700°C. The effect of oxides on the MgO solubility, and a method for calculating the solubility of MgO using slag composition and temperature.were discussed. The solubility of MgO is increased with increasing temperature and Fe_tO content, and with decreasing basicity (C/S). The effect of ?M_xO_y on the solubility of MgO is a dilution effect due to the increase in slag volume. The activity and activity coefficient of Fe_tO decreased with increasing basicity (B). The effect of temperature on the activity was negligible. The value of ?=Fe~(3+)/Fe~(2+) increased with the increase of the slag basicity (B") and the decrease of the Fe_tO content in the slag.