Limestone is added to the blast furnace to help remove impurities from the iron ore, such as silica. When limestone is heated, it decomposes to form calcium oxide, which reacts with impurities in the ore to form slag, which can be easily removed.
Coke is added as a reducing agent in the blast furnace. It burns at a high temperature in the presence of oxygen to produce carbon monoxide, which then reacts with the iron ore to reduce it to iron. The coke also provides the heat needed for the reaction to take place.
What is the use of limestone and coke in the blast furnace used in extraction of iron
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