Silica is added to raosted copper during extraction in order to remove:

Silica is added to roasted copper during extraction in order to remove:

Silica is added to roasted copper ore during smelting in order to remove :

Select and write the most appropriate answer from the given alternatives for each sub-question: Silica is added to roasted copper ore during smelting process to remove :

Explain why is silica added into the Bessemer converter during extraction of copper by self-reduction process.