the slag is lighter then molten iron and to floats on the surface of the iron. the formation of prevents the oxidation of iron. d. zone of reduction:-this is the most important zone and has temperature of 600-700 0 c. in this zone fe 2 o 3 is reduced to iron by co in three steps. 3fe 2 o 3 + co → 2fe 3 o 4 + co 2
extraction of metals. extraction of iron.. iron is extracted from its ore in the blast furnace.. the main iron ore is called haematite. haematite is iron(iii) oxide - fe 2 o 3. the iron ore contains impurities mainly silica (silicon dioxide). limestone (calcium carbonate) is added to the iron ore which reacts with the silica to form molten calcium silicate in the blast furnace.
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extraction of iron from haematite. 1. concentration: haematite ore being oxide ore is concentrated by gravity separation process using hydraulic separator. the oxide is being heavier settles to the bottom while lighter impurities come to the surface and is removed. 2. calcination:-