1. MSE504 – Tutorial Sept 21
No. 1: Below are some thermodynamic data applicable to the remelting of scrap iron
from 35 to 1600 oC. Use the given data to determine how much(kmol) natural gas(CH4)
has to be used per tonne(1000 kg) of iron recycled. Assume pure stoichiometric O2 for
the combustion of the CH4. Assume everything leaves at 1600 oC.
Total
Latent Enthalpy
Species T(oC) kmol kg Nm3 MJ MJ
Fe 25.000 17.906 1000.000 0.127 0.00 0.00
Fe 1600.000 17.906 1000.000 0.127 1349.53 1349.53
CH4(g) 25.000 1.000 16.043 22.414 0.00 -74.60
O2(g) 25.000 1.000 31.999 22.791 0.00 0.00
CO2(g) 1600.000 1.000 44.010 22.791 83.83 -309.68
H2O(g) 1600.000 1.000 18.015 22.414 66.62 -175.20
O2(g) 1600.000 1.000 31.999 22.791 54.43 54.43
No. 2: Describe how sulphur can be removed from pig-iron in the steelmaking process
No. 3: Explain and discuss the various roles coke play in the iron blast furnace
No. 4: In the BOF, oxygen is used to remove impurities. Discuss what reactions take
place and in which order they happen. How do you know when to stop the oxidation
process
No. 5: An aluminum electrolysis cell has a total cell voltage of 4.5 V, a cell current of
250,000 Amps and a current efficiency of 96%. Calculate:
a) daily aluminum production
b) specific energy consumption(kWHr/kg Al)