Effect of Slag Basicity and FeO Concentration on Slag–carbonaceous Material Interaction During Melting in Direct Reduced Iron-Based Electric Arc Furnace

The use of biochar can reduce fossil CO2 emissions from direct reduced iron (DRI)-based electric arc furnace (EAF) steelmaking. The effect of slag B2 basicity and FeO concentration on the interaction between pinebark-based biochar and TiO2- and V2O5-bearing DRI-based EAF slag was examined. For this, a carbonaceous material slag module (CSM) was prepared by placing a slag briquette on a biochar substrate, and the CSM underwent optical dilatometry (OD) at 1773 K in an argon atmosphere to assess the slag swelling index. It revealed that the slags with a B2 basicity of 1.5 and an FeO concentration of 40 wt.