1. A blast furnace burden contains 160 kg Fe2O3, 54 kg SiO2, 20 kg Al2O3, 100 kg CaCO3, and 70 kg C. For smelting this burden, 266 Nm3 of dry air is used. The produced hot metal just contains 4 percent C and 1 percent Si, the balance being iron. It is assumed that 99% iron in the burden enters the hot metal.

The remaining oxides and iron (as FeO), will form the slag, whereas CO2 from the limestone is expelled and mixes with the furnace gas. Carbon in the top gas is present partly as CO2 and CO and there is no free oxygen in this gas.

1. Calculate the weight of the hot metal produced, as well as the weight and composition of the slag, per ton of burden;
2. Calculate the volume and composition of the furnace gas / 1 ton of burden.
3. Make a critical mass balance analysis.