Jul 07, 2017 · The main uses of limestone in iron and steel industry are (i) as a fluxing material, and (ii) other usage which consists of desulphurizing agent, coating of moulds of pig casting machine, neutralizing of acidic water, water treatment, waste water (effluent) treatment, flue gas treatment, and sludge and sewage treatment.

Limestone is used in iron extraction to remove impurities from the iron and becomes molten slag. The calcium carbonate (CaO3) in limestone abolically reacts, forming calcium oxide (CaO) and carbon dioxide (CO2). CaO is highly reactive when subjected to the extreme heat of the furnace. CaO can react with impure iron, such as iron sulfide (FeS).

May 08, 2013 · In iron and steel Industry, limestone and dolomite are used both in ironmaking and steelmaking. Limestone and lime products are used as fluxing material both in ironmaking and in steelmaking. Basically limestone is used as a slag former, while dolomite is used as a slag former, slag modifier and as a refractory material.

The main role of limestone in extraction of iron is to decomposes in hot furnace and form the calcium oxide.

During the extraction of iron from haematite ore, limestone acts as a flux. Limestone decomposes froming CaO which reacts with silica forming slag. C aC O3. . → C aO +C O2. . C aO+S iO2. . →C aS iO3.