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

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What is a flux? - Chemistry (Theory)

Question

What is a flux?

Short Answer

Solution

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

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Chapter 8: d-and ƒ-Block Elements - QUESTIONS FROM ISC EXAMINATION PAPERS [Page 509]