Calcium Carbide CaC₂, commonly known as Dianshi in China, is a critical inorganic chemical compound. Calcium Carbide CaC₂ with the chemical formula CaC₂, is also commonly called carbide. Pure calcium carbide CaC₂ appears as colorless crystals, while industrial grades are typically grayish-black, brown, or black stones with a purple tint at higher purity. It has a density of 2.22 g/cm³ and a melting point around 2300°C.
Its defining chemical property is its violent reaction with water, producing highly flammable acetylene gas (C₂H₂) and calcium hydroxide, accompanied by intense heat release. This reaction is the foundation of its primary industrial applications. And this is the most important using for the Calcium Carbide CaC₂.
Industrially, it is manufactured by calcining quicklime and coke in an electric furnace at a very high temperature. It is mainly used to produce acetylene for metal welding and cutting. It is also a key raw material for making PVC resin, chemical pesticides and calcium cyanamide. In metallurgy, it can be used as a desulfurizer and deoxidizer for steelmaking.
Calcium Carbide CaC₂ is a highly hazardous chemical that reacts violently with water and moisture to produce flammable acetylene gas, so strict storage rules must be followed.
It should be stored in a dry, cool, well-ventilated and fire-proof warehouse. The storage area must be kept completely dry, with no water leakage or humid environment allowed. Keep far away from rain, groundwater and any moisture sources.
