European Direct Reduced Iron and Alternative Ironmaking Conference - IRONMASTERS 2022

The reduction of CO2 emission is one of important issue for the sustainable production of steel in EAF(Electric Arc Furnace). The way to decrease CO2 emissions can be achieved by reducing the use of electrical energy, and by increasing the use of chemical energy without carbon based materials. In general, the chemical energy of EAF can be improved by the heats of oxidation reaction and the carbon combustion. However, by adding carbon based materials into the molten steel, carbon is not dissolved completely due to its high melting points, and floated to the slag layer due to low density. On the other hand, Al dross is a by-products of Al smelting process and it includes 20~30 mass% of metallic aluminium. The oxidation reaction heat of aluminium in Al-dross is three times higher than that of carbon. In the prior study, the dissolution behaviour of carbon and aluminium in a fuel mixture of coke and Al-dross were measured. The influence of mixing ratio of coke and Al-dross on the dissolution rate constants of carbon and aluminium in molten steel was reported. In this study, the optimized mixing ratio of coke and Al-dross was calculated by the oxidation reaction heat and the formation of Al2O3 in slag. After dissolution of oxidation materials with optimized ratio, the temperature changes in molten steel was measured with oxygen blowing and simulated by the coupled reaction model.