In: Chemistry
Consider an iron blast furnace charged with iron ore, limestone (CaCO3) and coke. The weight analyses of the charge is as follows:
Ore: Fe2O3, 80%; SiO2, 12%; MnO, 1%; Al2O3, 3%; H2O, 4%.
Limestone: SiO2, 4%; H2O,1%; CaCO3 95%.
Coke: SiO2, 10% ; C, 90%.
The ultimate weight analysis of the pig iron gives 93.8% Fe, 4% C, 1.2% Si and 1% Mn. For every ton of pig iron produced, 1750 kg of iron ore and 500 kg of limestone are used and 4200m3 of flue gas is produced.The rational analysis of flue gases gives 58% N2, 26% CO, 12% CO2, and 4% H2O. The reactions occurring in the blast furnace are:
Fe2O3 + 3CO <--> 2Fe + 3CO2
CaCO3 <--> CaO+CO2
C + 1/2 O2 <--> CO
SiO2 + 2C <--> Si + 2CO
MnO+C <--> Mn + CO2
CO2 + C <--> 2CO
Determine the following:
a) Quantity of coke used per ton of pig iron
b) Consumption of air per ton of pig iron
c) Composition of the slag