Ferrous sulfide is an important chemical mineral raw material, primarily used in the production of sulfuric acid. It is also partially utilized as a chemical raw material to produce sulfur and various sulfur-containing compounds. It plays a significant role in industries such as rubber, friction materials, papermaking, textiles, food, matches, and agriculture. As a filler in friction materials, it has a certain proportion and provides good friction-enhancing effects, achieving a favorable friction coefficient while reducing braking noise.