The temperature of the slag zone in the metallurgy of iron using blast furnace is

Options

A. `1500 - 1600^(@)C`
B. `400-700^(@)C`
C. `800-1000^@C`
D. `1200-1500^(@)C`

Answer

C

Explanation

Slag formation zone is the central zone in the blast furnace where the temperature varies from `800-1000^@ C`. Here, limestone decomposes into CaO and `CO_2`.
`CaCO_(3) overset(1000^@ C) rarr CaOH + CO_2`
CaO acts as a flux as it combines with silica present as an impurity (gangue) to form a fusible slag of `CaSiO_3`.
`CaO + SiO_(2) overset(1000^@C) rarr underset("Slag")(CaSiO_3)`