The method can remove sulfur as a detrimental impurity in the iron ore concentrates while extracting iron and reducing silicon of the iron ores without considering the influence of numerous foams generated by an oil foamer on an iron separation process, lowers the medicament cost, simplifies the process flow, is easy to implement in production, can be widely used for the iron increase, desulfurization and silicon reduction of magnetite separation plants and hematite separation plants, and can also be used for the desulfurizing and silicon reducing flotation of limonite, martite and semi-martite.

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