Glossary
Limestone
Steel
Along with iron ore and coke, limestone is an important ingredient in blast furnace ironmaking. The function of limestone is to react with impurities introduced by the other two ingredients to form a slag which can be removed from the furnace without contaminating the iron. The heat inside the blast furnace converts limestone into calcium oxide and CO2 gas. Calcium oxide readily reacts with impurities like silica, sulphur, alumina and magnesia to form a slag. This gradually filters down through the furnace to settle on top of the liquid iron where it can be tapped off.
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Very good overview of the weekly steel market.
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