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Example 3.6 An ironmaking blast furnace produces hot metal of the composition: 94% Fe, 1.5% Si, 4% C, 0.15% Mn, 0.1% P and 0.05% S. The charge contains two types of haematite ores: (i) ore A has a high silica content, and (ii) ore B has high limestone content. The coke rate is 800 kg per tonne of hot metal produced. The slag basicity (SO) must be 1.4 in order to achieve low sulphur content in the hot metal, and the | ratio in the exit gases is 2. Calculate per tonne of hot metal produced: (a) the weight of each ore required, (b) the weight of slag produced and sulphur content of the slag (wt %) and (c) the volumes of blast and exit gases. Composition Ore A Ore B Coke Fe 55.3 45.5 0.7 86.0 Mn 0.10 0.07 Si P 0.04 0.08 0.05 0.5 4.0 3.0 S 0.15 SiO2 13.0 CaCO3 7.0 There is no loss of sulphur or fine ore in the exit gases 30.0 5.6 (CaO)