Question

The main reactions occurring in blast furnace during extraction of iron from haematite are

• A. $ F{{e}_{2}}{{O}_{3}}+3CO\xrightarrow[{}]{{}}2Fe+3C{{O}_{2}} $
• B. $ FeO+Si{{O}_{2}}\xrightarrow[{}]{{}}FeSi{{O}_{3}} $
• C. $ F{{e}_{2}}{{O}_{3}}+3C\xrightarrow[{}]{{}}2Fe+3CO $
• D. $ CaO+Si{{O}_{2}}\xrightarrow[{}]{{}}CaSi{{O}_{3}} $

Answer 1

Answer: (A)

$ F{{e}_{2}}{{O}_{3}}+3C\xrightarrow[{}]{{}}2Fe+3CO, $ reaction does occur in the blast furnace at temperatures above 1123 K when almost all the $ F{{e}_{2}}{{O}_{3}} $ has already been reduced to Fe. Hence, it is not the main reaction. $ CaC{{O}_{3}} $ decomposes around 1123 K to give $ CaO $ .Since, below this temperature, $ ~FeO $ has already been reduced to Fe. So, $ ~FeO $ does not combine with $ Si{{O}_{2}} $ to form slag, $ FeSi{{O}_{3}} $ . Main reactions which occur in the blast furnace are $ F{{e}_{2}}{{O}_{3}}+3CO\xrightarrow[{}]{{}}2Fe+3C{{O}_{2}} $ $ CaO+Si{{O}_{2}}\xrightarrow[{}]{{}}CaSi{{O}_{3}} $