Cement is a mixture of limestone, clay and other materials processed by high temperature calcination. Glass is made from limestone, quartz sand, soda ash and other mixtures, and obtained by high temperature melting, iron with limestone used as flux to remove gangue. In steelmaking limestone is used to form slag materials to remove sulfur, phosphorus and other harmful impurities. Calcium carbide (main ingredient is CaC2) is from the limestone and coke reacted in the furnace. Soda ash is produced by limestone, salt, ammonia and other raw materials through multi-step reaction (Solvay method). Soda limestone and soda ash reaction (Caustic method) make caustic soda. Using pure limestone and chlorine reaction to bleach. The chemical processing of limestone make the calcium chloride, calcium nitrate, calcium sulfite etc. Limestone is used to soften water and can remove temporary hardness of the water. Burning Limestone mining process into a more pure calcium carbonate powder, is used as filler of rubber, plastic, paper, toothpaste, cosmetics, etc. The soda lime made by caustic soda with lime for carbon dioxide absorbent. Quicklime is used as a dryer and disinfectant. In agriculture, lime sulfur mixture is mixed with lime, as well as Bordeaux mixture and other pesticides. The application of hydrated lime to the soil can neutralize the soil acidity and improve soil structure, supply plant-available calcium. Brush the tree trund with lime liquid can protect trees.