Heavy calcium carbonate referred to as heavy calcium, which is made of limestone with high quality and processed into white powder by lime mill. Its main ingredient is CaCO3. The heavy calcium has the characteristics of high whiteness, good purity, soft hue and stable chemical composition. Heavy calcium is usually used as a filler, widely used in artificial floor tiles, rubber, plastic, paper, paint, paint, ink, cable, building supplies, food, textile, feed, toothpaste and other daily chemical industries. As a filler, it can increase the volume of the product and reduce production. It can increase the volume of the rubber, improve the workability of the rubber, enhance the strength of the rubber, and adjust the hardness of the rubber.