em 5.) == 700 kg/THM Direct-indirect reduction in the blast furnace. Calculate the percentage indirect reduction of iron oxide from the following data: Coke rate (85% fixed carbon) THM= tons hot metal Top gas volume 3,50 Nm /kg coke Top gas analysis 14,5% CO2, 28,5% CO, 57% N2 Carbon in iron 3,5% Oxygen in air 21% 0 (79% N) Density of oxygen 1,43 kg/Nm Total oxygen combined with iron as Fe, 0, Fe, 400 kg/THM -2.3 . Carbon consumed by metalloids 12 kg/THM 204 Loide