Calcium carbonate is not a salt. Calcium carbonate is an inorganic compound with the chemical formula CaCO?, commonly known as limestone, limestone, stone powder, etc. Calcium carbonate is alkaline, basically insoluble in water, and soluble in hydrochloric acid. It is one of the common substances on the earth. It is found in rocks such as aragonite, calcite, chalk, limestone, marble, and travertine. It is also the main component of some animal bones or shells. Calcium carbonate is also an important building material and is widely used in industry.

Calcium carbonate is a white fine crystalline powder, tasteless and odorless. There are two forms: amorphous and crystalline. The crystal form can be divided into orthorhombic crystal system and hexagonal crystal system (calcium carbonate anhydrous is colorless orthorhombic crystal, calcium carbonate hexahydrate is colorless monoclinic crystal, columnar or rhombus, with a density of 2.93g/cm3.

Calcium carbonate is the trade name of limestone, a precious resource with a wide range of uses. Limestone has been widely used in the history of human civilization because of its wide distribution and easy access in nature. Building materials have a long history of mining. In modern industry, limestone is the main raw material for manufacturing cement, lime, and calcium carbide. It is an indispensable flux limestone in the metallurgical industry. High-quality limestone is widely used in papermaking after ultra-fine grinding. , rubber, paint, coating, medicine, cosmetics, feed, sealing, bonding, polishing and other products.