GATE 2021 MT – Question 46

A blast furnace uses hematite ore with 80% $Fe_2O_3$ and 20% gangue. Coke use is 600 kg per ton hot metal, with 85% C and 15% ash. Hot metal is 95.5% Fe and 4.5% C. Ore use and slag production per ton hot metal, respectively, are ______. Atomic weights O = 16, C = 12, N = 14, Fe = 56; all compositions are wt.%; 1 ton = 1000 kg. Assume ore gangue and coke ash form slag, while ore $Fe_2O_3$ is consumed in producing hot metal.