Lime and limestone are widely used as building materials and important raw materials for many industries. Limestone can be directly processed into stone and burned into quicklime. Lime includes quicklime and hydrated lime. The main component of quicklime is CaO, which is generally massive, pure white, and light gray or light yellow when containing impurities. After absorbing water or adding water, quicklime becomes hydrated lime, also called hydrated lime, and its main component is Ca(OH)2. Slaked lime is mixed into lime slurry, lime paste, lime mortar, etc. , used as coating and tile adhesive. Cement is made by mixing limestone and clay and calcining at high temperature. Glass is a mixture of limestone, quartz sand and soda ash. And melted at high temperature. Limestone is used as a flux to remove gangue in ironmaking. Quicklime is used as slagging material in steelmaking to remove harmful impurities such as sulfur and phosphorus. Calcium carbide (mainly CaC2) is made by the reaction of quicklime and coke in an electric furnace. Soda soda is made from limestone, salt, ammonia and other raw materials through multi-step reaction (Solway method). Caustic soda is made by the reaction of hydrated lime and soda ash (causticization method). Bleached lime is prepared by the reaction of pure lime and chlorine. Calcium chloride, calcium nitrate, calcium sulfite and other important calcium salts are made by chemical processing of limestone. Hydrated lime can remove the temporary hardness of water and be used as a hard water softener. Limestone is calcined into pure powdered calcium carbonate, which is used as filler for rubber, plastic, paper, toothpaste, cosmetics and so on. Alkaline lime made of lime and caustic soda is used as an absorbent of carbon dioxide. Quicklime is used as a desiccant and disinfectant. In agriculture, quicklime is used to prepare pesticides, such as lime-sulfur mixture and Bordeaux mixture. The application of hydrated lime in soil can neutralize the acidity of soil, improve soil structure and provide calcium for plants. Brush lime slurry on the trunk to protect the trees.

Oil is the lifeblood of economic and national strength development. Whoever owns oil will have the development of 2 1 century. It is not only an economic activity to reserve oil and participate in oil futures market trading, but also for the consideration of strategic development goals. Therefore, controlling oil resources is one of the factors leading to the outbreak of the Iraq war. There is an old saying in China that food is the most important thing for the people. Limestone is the grain of cement industry and the lifeblood of cement production. As long as the cement plant produces, limestone is indispensable for a moment. Whoever occupies limestone resources will occupy the development of cement industry. At present, China's cement enterprises are competing for the market, which can also be said to be a dispute over limestone resources. Therefore, large enterprise groups regard the dominant limestone resources as one of the measures to realize their own development strategy.

1. Limestone is a valuable resource with a wide range of uses. Limestone is the trademark name of limestone as a mineral raw material. Limestone is widely used in the history of human civilization because of its wide distribution and easy availability in nature. As an important building material, it has a long mining history. In modern industry, limestone is the main raw material for manufacturing cement, lime and calcium carbide, and it is an indispensable flux limestone in metallurgical industry. After superfine grinding, high-quality limestone is widely used in making paper, rubber, paint, coating, medicine, cosmetics, feed, sealing, bonding and polishing products. According to incomplete statistics, the ratio of limestone consumed in cement production to limestone consumed in building stone, lime production, metallurgical flux and superfine calcium carbonate is 1: 3. Limestone is a non-renewable resource. With the continuous progress of science and technology and the development of nanotechnology, the application field of limestone will be further broadened.