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. The gas contained 28%CO and 12%CO2. Required: per ton of pig iron made: (1) The weight of ore used (2) The weight of slag made (3) The volume of the blast-furnace gas Prob. 4: In the furnace of prob. 3, the blast is preheated to 650C. The gases leave the top of the furnace at 250C. Required: A heat balance of the furnace