Study on sulphide capacity of CaO-SiO 2-Al 2O 3-MgO-Fe tO slags

Abstract

The sulphide capacity of CaO-SiO 2-Al 2O 3-MgO-Fe tO slags was studied at 1773 K using gas-slag equilibrium techniques. Utilizing a Pt crucible, the slag was equilibrated with a mixture of gases, namely, CO, CO 2, SO 2 and N 2 to provide the partial pressure of oxygen and sulphur. It was shown that at fixed Fe tO and Al 2O 3 contents and a fixed {(%CaO)+(%MgO)}/(%SiO 2) ratio, the sulphide capacity decreases with increasing MgO content. At a constant (%CaO)/(%SiO 2) ratio and constant MgO and Al 2O 3 contents, increasing the Fe tO content of the slags also results in an increase of the sulphide capacity. The rising basicity of (%CaO)/(%SiO 2) from 1.0 to 1.4 at fixed MgO, Fe tO and Al 2O 3 contents significantly increases the sulphide capacity.