Optimization of the proportion of lump ores based on the basic properties and interaction reactions of iron-bearing materials

Abstract

Incorporating natural lump ore into the blast furnace plays a crucial role in lowering production expenses and minimizing carbon emissions during the ironmaking process. In this paper, based on the study of the basic properties and interaction reactions of iron-bearing materials, the focus is on investigating the influence of different lump ore ratios on the softening-melting properties of the integrated burden. The findings indicate that among the five iron-bearing materials, the pellet exhibits the least reducibility. Additionally, lump ore L-B demonstrates inferior thermal decrepitation properties as well as low-temperature reduction disintegration properties. There is an interactive reaction between acidic iron-bearing materials (lump ore and pellet) and high basicity sinter, and the interaction between them is different. The main product of high-temperature interaction is CaFeSiO₄, which is beneficial to improving the relatively poor softening properties of acidic iron-bearing materials themselves. When the proportion of sinter in the integrated burden is 75%, increasing the lump ore with strong interactive reactions to replace the pellet with weak interactive reactions, the optimal proportion of the lump ore to be used is 22%. The properties of different types of iron-bearing materials vary significantly. Based on this, the structure of the blast furnace burden can be optimized, thereby enhancing the smelting efficiency of the blast furnace and reducing production costs.