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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.
Variations of the blast furnace, such as the Swedish electric blast furnace, have been developed in countries which have no native coal resources. Lead blast furnaces Blast furnaces are currently rarely used in copper smelting, but modern lead smelting blast furnaces are much shorter than iron blast furnaces and are rectangular in shape.