Role of limestone in the manufacture of pg iron from hematite
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Limestone is known as one of the vital raw materials used in production of iron and steel. ... Silica and alumina are the main impurities of limestone. The limestone which is used in iron making is required to contain at least 85 % of calcium carbonate and a low percentage of alumina limestone is added to convert this into slag which melts and runs to the bottom. The heat of the furnace decomposes the limestone to give calcium oxide. ... The calcium silicate melts and runs down through the furnace to form a layer on top of the molten iron. It can be tapped off from time to time as slag.
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