Question

What is a flux?

Answer 1

1. Flux is a substance added during smelting to remove impurities by forming slag.
2. It chemically combines with impurities to make a fusible compound that separates from the metal.
3. The choice of flux depends on impurity type (e.g., CaO for acidic impurities, SiO₂ for basic).
4. The lighter slag floats and is removed, leaving purer metal.