Calcium carbonate is a valuable resource for a wide range of uses
Limestone is the trade name for limestone as a mineral raw material. Limestone is widely used in the history of human civilization because of its wide distribution and easy access in nature. As an important building material, it has a long history of mining. In modern industry, limestone is the main raw material for the manufacture of cement, lime and calcium carbide. It is an indispensable flux limestone in the metallurgical industry. High-quality limestone is widely used after ultra-fine grinding. Used in the manufacture of paper, rubber, paint, paint, medicine, cosmetics, feed, sealing, bonding, polishing and other products. According to incomplete statistics, the ratio of limestone and building stone consumed by cement production, lime production, metallurgical flux, and superfine calcium carbonate consumption limestone is 1:3. Limestone is a non-renewable resource. With the continuous advancement of science and technology and the development of nanotechnology, the application of limestone will be further broadened.
Overview of China's calcium carbonate resources and their geographical distribution
China is one of the countries with rich limestone resources in the world. In addition to Shanghai, Hong Kong and Macao, it is distributed in all provinces, municipalities and autonomous regions. According to the statistics of the former National Building Materials Bureau Geological Center, the distribution area of ​​limestone in China is 438,000 KM2 (excluding Tibet and Taiwan), accounting for 1/20 of the country's land area. The limestone resources that can be used as cement raw materials account for about the total resources. 1/4 to 1/3. In order to meet environmental protection, ecological balance, prevention of soil erosion, landscape tourism and other aspects, especially with the continuous improvement and implementation of China's small town construction planning, the amount of cement limestone mining will be reduced. Seventy-eight thousand cement limestone mines have been discovered in the country, of which 1,286 have proven reserves, including 257 large deposits, 481 medium-sized, and small 486 (the ore reserves are more than 80 million tons for large scale, 4000-8000). Ten thousand tons of medium-sized, less than 40 million tons is small), with a total of 54.2 billion tons of ore reserves, including 50.4 billion tons of limestone reserves, accounting for 93%; and 3.8 billion tons of marble reserves, accounting for 7%. The reserves are widely distributed in 29 provinces, municipalities and autonomous regions except Shanghai. Among them, Shaanxi has 4.9 billion tons of reserves, which is the highest in the country; the rest are Anhui Province, Guangxi Autonomous Region, Sichuan (including Chongqing), and each has its own Reserves of 3-4 to 3 billion tons; Shandong, Hebei, Henan, Guangdong, Liaoning, Hunan, and Hubei provinces each have reserves of 3 to 2 billion tons; Heilongjiang, Zhejiang, Jiangsu, Guizhou, Jiangxi, Yunnan, Fujian, Shanxi, Xinjiang, and Jilin The provinces of Inner Mongolia, Qinghai and Gansu each have a reserve of 2 billion to 1 billion tons; the five provinces of Beijing, Ningxia, Hainan, Tibet and Tianjin each have a reserve of 500-200 million tons.
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