How long to heat pyrite to turn it into iron?

To convert pyrite (iron sulfide, FeS2) into iron, it typically requires heating to temperatures around 1200-1400°C (2192-2552°F) in the presence of a reducing agent, such as carbon. This process, known as smelting, not only removes sulfur but also reduces the iron content. The exact time needed for heating can vary depending on the method and scale of the operation, but generally, it can take several hours to achieve complete reduction.