Pyrite is separated from the air by high temperature to produce iron and sulfur. The equation is FeS2 = = = Fe+2S.

Calcination in air produces iron oxide and sulfur dioxide. This formula is often tested, especially the numerical coefficient is 4. 1 1.2.8. The chemical equation is 4fe2+11o 2 = 2fe2o3+8so2.

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