Smelting is the process of melting a metal ore in order to separate the metal from other elements.
Smelting is an important part of making metal things. It is a hot and dangerous process.
Examples:
The smelting of iron ore produces iron.
Smelting is used to make many different kinds of metal.
The workers are doing the smelting.
The smelting process is very hot.
The smelting of gold is a very old process.
I saw the smelting on TV.