Conversion of Concentrated Ore to Oxide Question:- What is Roasting? Question:- What is Calcination? :- What is Reduction of Metal Oxide to Metal? :- What is Hydrometallurgy? :- What is Hydrometallurgy Process? :- What is Pyrometallurgy? :- What is Pyrometallurgy Process? :- What is Oxidation Reaction? :- What is Electrometallurgy?