The sulphide capacity of CaO-SiO₂-Al₂O₃-MgO(-FeO) smelting reduction slags

TL;DRAbstract

The effects of MgO and FeO contents on the sulphide capacity of Corex slags were investigated at 1773 K using gas/slag equilibrium technique as a fundamental study for stabilising Corex operational conditions. The gradual substitution of MgO for CaO at a fixed basicity [B = {(%CaO)+(%MgO)}/(%SiO2)] decreased the sulphide capacities of CaO-SiO2-Al2C3-MgO slags. The addition of FeO into the CaO-SiO2-Al2O3-MgO slags at the fixed (%CaO)/(%SiO2) ratio, MgO and Al2O3 contents significantly increased the sulphide capacities. The sulphide capacity decreased according to the increasing Al2O3 content at the fixed (%CaO)/(%SiO2) ratio, MgO and FeO content. Based on the previously reported and present values of sulphide capacities, the sulphide capacity as a function of slag composition on the mole fraction base at 1773 K was expressed by the formula of log CS = XCaO – 3.89 XSiO2 – 3.18 XAl2O3 – 0.55 XMgO + 2.43 XFeO – 2.61. In addition, the relationship between the sulphide capacity and optical b

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