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Iron sulfide exists in liquid form chemically, and in metallurgy it is also known as pyrite or a sulfur-enhancing agent. It is primarily used in steelmaking and casting processes. The actual amount of iron sulfide used in metallurgy is not large, as sulfur is considered a harmful substance in smelting; however, an appropriate amount of sulfur can improve the quality of the products. In steelmaking, for example, adding an appropriate amount of iron sulfide can enhance the machinability of the steel. In casting, the addition of iron sulfide also serves to improve the quality of the castings. When producing graphite cast iron, adding iron sulfide can help improve the distribution pattern of graphite, thereby enhancing its quality! Everything has two sides; just because iron sulfide is a harmful substance, it shouldn’t be discarded. The key is to make use of iron sulfide effectively in order to improve the quality of metallurgical products! Iron sulfide is a brownish-black lumpy substance ； Melting point: 1193–1199°C, density: 4.74 grams per cubic centimeter ； Insoluble in water, soluble in acidic aqueous solutions, with hydrogen sulfide being produced simultaneously ； It oxidizes easily when heated in air; sulfur is obtained by heating it in a vacuum to over 1100°C. Ferrous sulfide can be produced by the direct reaction of two elements, or it can be obtained by reacting an iron(II) salt solution with an alkali metal sulfide. In the laboratory, it can be used to generate hydrogen sulfide gas ； It can also be used in the ceramic and paint pigment industries.