Question
The following reactions take place in the blast furnace in the preparation of impure iron. Identify the reaction pertaining to the formation of the slag.
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Fe2O3 (s) + 3CO (g) → 2 Fe (l) +3CO2 (g)
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CaCO3 (s) → CaO (s) + CO2 (g)
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CaO (s) +SiO2 → CaSiO3 (s)
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2C (s) + O2 (g) → 2 CO(g)
Solution
C.
CaO (s) +SiO2 → CaSiO3 (s)
A slag is an easily fusible material which is formed when gangue still present in the roasted or the calcined ore combines with the flux. For example, in the metallurgy of iron, CaO (flux) combines with silica gangue to form easily fusible calcium silicate (CaSiO3) slag.
CaO + SiO2 → CaSiO3 (slag)
