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During the period of cooling and hardening from its molten state, BF slag can be cooled in several ways to form any of several types of BF slag products. Blast Furnace: Combustion material and ore are supplied from the top while an air flow is supplied from the bottom of the chamber.
How Iron and Steel Work. A worker covers the steel slag poured on the ground with sandy soil at a stainless steel factory. Â­The more advanced way to smelt iron is in a blast furnace. A blast furnace is charged with iron ore, charcoal or coke (coke is charcoal made from coal) and limestone (CaCO3Â­). Huge quantities of air blast in at the bottom of the furnace, and the calcium in the limestone combines with the silicates to form slag.