Step 1: Firstly the raw materials iron ore (Haematite, Fe 2 O 3), coke (carbon) and limestone (calcium carbonate, CaCO 3) is added from the top of the blast furnace. I will discuss the reason for adding limestone later on. Just to give a simple idea, for now, it helps to remove some of the impurities.
The function of the limestone; Cast iron; Steel; Steelmaking: the basic oxygen process; Types of iron and steel; Some environmental considerations. Environmental problems in mining and transporting the raw materials; Extracting iron from the ore. Recycling; Contributors