How is cast iron extracted from iron pyrites?
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Iron pyrites (FeS2) is not directly used as an ore for the extraction of iron because it contains quite high percentage of sulphur. Due to high content of sulphur it is primarily us for the manufacture of H2SO4, For this purpose it is burnt in air to get SO2:
4FeS2 + 11O2 → 2Fe2O3 + 8SO2 ↑
SO2 is converted into SO3 which is absorbed in water get H2SO4. The residual FeO3 formed during burning of FeS2is reduced to iron in blast furnace
4FeS2 + 11O2 → 2Fe2O3 + 8SO2 ↑
SO2 is converted into SO3 which is absorbed in water get H2SO4. The residual FeO3 formed during burning of FeS2is reduced to iron in blast furnace
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