Features of Bivalent and Trivalent Iron Oxide Reduction from Slag with Carbon

Liquid-phase reduction of bi- (FeO) and trivalent (Fe2O3) iron from slag with activated coal is studied: BAU (wood) and KAD (bituminous). Kinetic relationships are obtained for reduction at 1450°C from slag with an initial overall iron content Fetot ≈ 5%. It is shown that regardless of the type of coal liquid-phase reduction of iron to metal from slag with a preponderance of Fe2O3 is difficult compared with slag containing mainly FeO, and requires preliminary reduction of trivalent to bivalent iron. A relationship is established for the rate of liquid-phase reduction on carbon reducing agent properties (structure porosity, ash content, sulfur content). The greater reducing capacity of BAU coal compared with KAD correlates with the lower ash and sulfur content of BAU coal.