Cement is made by mixing limestone and clay and calcining at high temperature. Glass is made by mixing limestone, quartz sand, soda ash, etc. and melting at high temperature. Limestone is used as a flux in ironmaking to remove gangue. Steelmaking uses quicklime as a slag-making material to remove harmful impurities such as sulfur and phosphorus. Calcium carbide (the main component is CaC2) is made by reacting quick lime with coke in an electric furnace. Soda ash is made from limestone, common salt, ammonia and other raw materials through a multi-step reaction (Solvay method). Caustic soda is produced by the reaction of slaked lime and soda ash (causticizing method). Bleached by the reaction of pure hydrated lime and chlorine. Chemical processing of limestone is used to make calcium chloride, calcium nitrate, calcium sulfite and other important calcium salts. Slag removes the temporary hardness of water and is used as a hard water softener. Limestone is calcined and processed into relatively pure powdery calcium carbonate, which is used as a filler for rubber, plastics, paper, toothpaste, cosmetics, etc. Soda lime made from lime and caustic soda is used as carbon dioxide absorbent. Quicklime is used as a desiccant and disinfectant. In agriculture, quicklime is used to prepare lime sulfur mixture, Bordeaux liquid and other pesticides. The application of slaked lime in the soil can neutralize the acidity of the soil, improve the structure of the soil, and supply calcium required by plants. Brush the trunk with lime mortar to protect the trees. Active lime price
There is an old saying in China that people take food as their destiny, and destiny also. Limestone is the grain of the cement industry and the lifeblood of cement production. As long as a cement plant produces, it is inseparable from limestone for a moment. Whoever owns the limestone resources will own the development of the cement industry. At present, the battle for cement companies in China to compete for the market can also be said to be a battle for limestone resources. Therefore, large enterprise groups have taken advantage of limestone resources as one of the measures to achieve their own development strategies.
1. Limestone is a valuable resource with a wide range of uses. Limestone is the trade name of limestone as a mineral raw material. Limestone has been widely used in the history of human civilization for its widely distributed and easily accessible nature. 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. Excellent limestone is widely ground after ultra-fine grinding. Used in the manufacture of paper, rubber, paint, coatings, medicine, cosmetics, feed, sealing, bonding, polishing and other products. According to statistics, the ratio of the sum of limestone and building stone consumed in cement production, lime production, metallurgical flux, and limestone consumed by ultra-fine calcium carbonate is 1: 3. Limestone is a non-growthable resource. With the continuous progress of science and technology and the development of nanotechnology, the application field of limestone will be further expanded.
2. China is one of the countries with rich limestone mineral resources in the world. Except for Shanghai, Hong Kong and Macau, it is distributed in all provinces, municipalities and autonomous regions. According to the statistics of the Geological Center of the former National Building Materials Bureau, the distribution area of limestone reaches 438,000 km2 (excluding Tibet and Taiwan), which accounts for about 1/20 of the land area. Among them, the amount of limestone resources available for cement raw materials accounts for about 1 / 4 to 1/3. In order to meet the needs of environmental protection, ecological balance, prevention of soil erosion, landscape tourism, etc., especially with the continuous improvement and implementation of China's small town construction plans, the amount of cement limestone available will also decrease.