Limestone: The main mineral component is calcite. Mineral particles and crystal structures are rare, the surface is smooth, and it is in the form of small particles. Hardness varies, and some dense limestones can be polished. The colors are black, gray, white, yellow and brown. Limestone contains lime formed from sea water, hence its name. The main component of natural minerals such as marble, limestone, chalk, and rocks is calcium carbonate. Limestone is the trade name for limestone as a mineral raw material. Limestone has been widely used in the history of human civilization because of its wide distribution in nature and easy access. As an important building material, it has 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. After ultra-fine grinding, high-quality limestone is widely used It is used in the manufacturing of paper, rubber, paint, coating, medicine, cosmetics, feed, sealing, bonding, polishing and other products. According to incomplete statistics, the ratio of limestone consumed in cement production to the sum of building stones, lime production, metallurgical fluxes, and ultrafine calcium carbonate is 1:3. Limestone is a non-renewable resource. With the continuous advancement of science and technology and the development of nanotechnology, the application fields of limestone will be further expanded.