During the extraction of copper , the impurity (FeS) is removed as slag by mixing the contaminated copper ore with silica and coke. The molecular form
During the extraction of copper , the impurity (FeS) is removed as slag by mixing the contaminated copper ore with silica and coke. The molecular formula of slag is
A. `FeSiO_(3)`
B. `Fe_2O_3`
C. `FeSi`(solid)
D. FeSi(vapour)
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Correct Answer - A
Copper pyrite is roasted first and forms `Cu_2S` and `FeS`. In blast furnace in presence of air , it oxidises to `Cu_2O` and `FeO`. The impurity FeO reacts with sand (silica) to form slag. `FeO+SiO_2tounderset("Ferrous Silicate" ("slag"))(FeSiO_3)`
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