Descriptions | Calcium sulfide (CaS) is an inorganic compound, in which calcium (Ca) and sulfur (S) are bound by ionic bonds. It is a white or pale yellow crystalline solid at room temperature and pressure, with certain hygroscopicity and corrosiveness. Calcium sulfide is mainly used for producing sulfuric acid, manufacturing fertilizers (such as gypsum), building materials (such as gypsum boards), agricultural amendments (as soil amendments, increasing soil organic matter content and improving structure), and as raw materials for certain chemical products. In industrial production, it can be obtained by reacting limestone (CaCO3) with sulfur (S) after high-temperature calcination. Due to its easy solubility in water to form a calcium sulfate solution, it is also used in sewage treatment as a precipitant to help remove certain harmful substances. It should be noted that calcium sulfide should avoid direct contact with the skin and eyes during use to prevent irritation and corrosion. |