Smelting of iron is carried out in
Blast furnace
Blast furnace: It is a special type of furnace made of steel plates. The inner surface is lined with fire-bricks and other refractory material. It has double cup and cone arrangement. Also, while in operation, a blast of hot preheated air is blown using tuyeres such that the temperature decreases from the bottom to the top. It is used for iron extraction
Reverberatory furnace is used for roasting and smelting.
Muffle furnace may be used in extraction of Zinc.
Electric furnace is used in steel making