Calcium carbonate is an inorganic compound with the chemical formula of CaCO3, 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 and exists in aragonite, calcite, chalk, limestone, marble,travertine and other rocks. Calcium carbonate is also an important building material, which is widely used in industry It is widely used in the manufacture of plastid,papermaking, rubber, paint, coating, hot melt glue, medicine, cosmetics, feed, sealing bonding, polishing and other products, as well as optical neodymium glass raw materials.