nature like FeO acidic flux like SiO2 is added to the gangue.
CaO(s) + SiO2(s)––––> CaSiO3(l)
FeO(s) + SiO2(s) ––––> FeSiO3(l)
Let is see:
Furnace: Furnace is the one which is used to carry out pyrochemical processes in metallurgy. We have mainly three parts in a furnace known as Hearth, Chimney and fire box.
Hearth is the place inside the furnace where the ore is kept for heating purpose.
Chimney is the outlet through which flue (waste) gases go out of the furnace.
Fire box is the part of the furnace where the fuel is kept for burning. In Blast furnace both fire box and hearth are combined in big chamber Chimney Ore which accommodates both ore and fuel. Reverberatory furnace has both fire box and hearth separated, but the vapours (flame) obtained due to the burning of the fuel touch the ore in the hearth and heat it. In furnaces like retort furnaces there is no direct contact between the hearth or fire box and even the flames do not touch the ore.
