Prob. 3: A blast furnace makes pig iron containing: C: 3.6%, Si: 1.4, and Fe: 95.0 The ore was 80%Fe2O3,12%SiO2 and 8%Al2O3. The coke ( 1Kg per Kg of pig iron) carried 10%SiO2 and 90%C. The flux ( 0.40Kg perKg of pig iron) was pure CaCO3. Prob. 3: A blast furnace makes pig iron containing: C: 3.6%, Si: 1.4, and Fe: 95.0 The ore was 80%Fe2O3,12%SiO2 and 8%Al2O3. The coke ( 1Kg per Kg of pig iron) carried 10%SiO2 and 90%C. The flux ( 0.40Kg perKg of pig iron) was pure CaCO3