Determination method of high-temperature characteristics of iron-ore sintering based on n(Fe₂O₃)/n(CaO)

The high-temperature characteristics of iron ores play important roles in optimizing ore proportion of sintering, which are tested by using iron-ore fines and analytical reagent CaO as raw materials. Two calculation methods of CaO addition amount based on binary basicity (basicity method) and n(Fe₂O₃)/n(CaO) (mole ratio method), respectively, were employed to evaluate the liquid phase fluidity (LPF) and the capability of calcium ferrite formation (CCFF) of iron ores. The results show that the rule of LPF of iron ores under the mole ratio method is different from that with basicity method. The LPF measured by basicity method has a linear positive correlation with the SiO₂ content, and there is no linear relationship between LPF and Al₂O₃ content or mass loss on ignition, which are inconsistent with the results of the previous study. And the results of CCFF with low SiO₂ content (< 3 wt.%) or high SiO₂ content (> 7 wt.%) based on basicity method cannot reflect the true CCFF. The mole ratio method could successfully solve this problem by reducing the effect of CaO addition amount changes caused by SiO₂ content of iron ores.