Furnace : Furnace is the one which is used to carry out pyrochemical processes in metallurgy.
Furnace has mainly three parts :
1) Hearth : Hearth is the place inside the ore is kept for heating.
2) Chimney : Chimney is the outlet through which flue (waste) gases go out of the furnace.
3) Fire box: Fire box is the part of the furnace where the fuel is kept for burning.