A Multimode Smelting Strategy for Converter Smelting Based on Novel Molten Iron Classification Methods

Abstract

Owing to the complexity of converter reactions and the inevitable fluctuations of raw materials, developing a universal smelting strategy suitable for all converter conditions is challenging. Therefore, this study introduces a multimode smelting strategy based on a novel classification method to categorize molten iron. In this method, the molten iron is classified into four regions based on the comprehensive effects of Si and P contents. Specific smelting strategies are recommended for the molten iron in each region. These strategies include adjustments to slag basicity, charging schemes, and the blowing mode of the lance. These multimode smelting strategies are implemented in actual production. The results indicate satisfactory optimization of production processes, including stable production, cost reduction, and increased efficiency. Consequently, the dephosphorization rate increases by 1.22%, the lime consumption per ton of steel decreases by 2.41 kg t−1, and the average basicity of steel slag decreases by 0.21. This strategy provides preliminary guidance before the initiation of the smelting process to improve efficiency, reduce consumption, and standardize the operations.