1.

What isthe role of limstonein theextractionof ironfromitsoxides ?

Answer»

Solution :Eitherlimestone itself or CaO obtained by itsthermaldecomposition actsas abasicfluxin theextractionof ironfromitsoxides. Itremoves acidicimpurityof` SiO_2`presentin the oxide ore to form FUSIBLE calciumsilicate SLAG.
`UNDERSET ("Basic flux")(CaCO_3(s)) +underset ("ACIDIC IMPURITY")(SiO_2(s)) overset (1123K) to underset ("Cal.silicate")(CaSiO_3(slag)) + CO_2(g) `
Altrnatively,
`""CaCO_3(s) overset (1123K) toCaO(s) + CO_2(g) `
`""underset ("Basic flux")(CaO(s)) +underset ("Acidic impurity")(SiO_2(s)) overset (1123K)tounderset ("Cal.silicate")(CaSiO_3(slag)) `


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