Research on the Precise Addition of Scrap Steel Based on Molten Iron Conditions During the Converter Smelting Process

Abstract

Scrap steel is an important raw material in converter smelting. Increasing the weight of scrap steel can both improve energy recovery rate and reduce the consumption of auxiliary materials. However, due to the fluctuation in raw material conditions and the dispatch hysteresis of the scrap steel, conservative approaches are often adopted during the addition weight of the scrap steel. This study identified the key influencing factors of the scrap ratio in the converter and proposed a scrap addition principle based on molten iron conditions. To solve the problem of precise addition of scrap steel, this study proposed a combined scrap steel addition mode and established a burdening calculation model, making the weight of added scrap steel adjustable during the smelting process. This work can guide the energy in the furnace to converge towards the product and improve the energy recovery rate in the converter. The industrial experiments of this scrap steel addition mode showed that the average scrap ratio increased by 2.13%, the consumption of lime per ton of steel decreased by 1.5 kg/t, the consumption of iron ore per ton decreased by 1.52 kg/t, and the production of steel slag per ton decreased by 10.2 kg/t, significantly reducing costs and increasing efficiency.

Graphical Abstract