| In a smelting reduction furnace, slag viscosity has much influence on the smooth tapping operation. In this study, the high temperature properties of slags sampled from a melter-gasifier were examined by the viscosity and melting temperature measurements. The effects of chemical composition changes and high temperature slag phases were considered. The effect of char or TiN as a second phase on the slag viscosity was also discussed. In the ironmaking slag system such as the CaO-MgO-SiO₂-Al₂O₃, the slag temperature played an important role in high temperature slag properties in terms of slag viscosity. The modified basicity, i.e., [(CaO+MgO)/(SiO₂+Al₂O₃)] turned out to be a better guidance for slag chemistry control, compared with the conventional basicies like CaO/SiO₂ and (CaO+ MgO)/SiO₂. |
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