The coke in the charge of blast furnace
Answer is:
supplies heat to reduce ore and melt the iron
Explanation:
The slag from the blast furnace
* is used as a ballast for rail road
* is mixed with tar for road making
* consists of calcium, aluminum and ferrous silicates
Cupola Furnace is a melting device which used to melt cast iron, Bronze and other alloying elements are melted. It is mainly used to convert pig iron to cast iron.
Cupola furnace is employed for melting scrap metal or pig iron for production of various cast irons. It is also used for production of nodular and malleable cast iron.