Sulfide ores are roasted to:

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Sulfide ores are roasted in air to convert the metal sulfides to metal oxides. This process is also known as calcination. The metal oxides are then reduced to the corresponding metals by different methods such as electrolysis or smelting. Roasting also helps to remove volatile impurities from the ore and to make the separation of the metal sulfide from other components easier. However, the primary purpose of roasting is to convert the metal sulfides to metal oxides.

Sulfide Ores Are Roasted To