Calcium carbonate is neutral, basically insoluble in water and soluble in hydrochloric acid. It is one of the common substances on the earth and exists in aragonite, calcite, chalk, limestone, marble, travertine and other rocks. It is also the main component of animal bones or shells.
Use:
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, polishing and other 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.
Extended data
General situation and geographical distribution of calcium carbonate resources in China;
China is one of the countries with abundant limestone resources in the world. Except Shanghai, Hong Kong and Macao, it is distributed in all provinces, cities and autonomous regions of China. According to the statistics of the Geological Center of the former National Bureau of Building Materials, the distribution area of limestone in China is 438,000 KM2 (excluding Tibet and Taiwan Province Province), accounting for about 1/20 of the land area, and limestone resources that can be used as cement raw materials account for about 1/4 ~ 1/3 of the total resources.
The reserves are widely distributed in 29 provinces, municipalities and autonomous regions except Shanghai, among which Shaanxi Province ranks first in the country, followed by Anhui Province, Guangxi Autonomous Region and Sichuan (including Chongqing) provinces, with reserves of 3.4-3 billion tons, while Shandong, Hebei, Henan, Guangdong, Liaoning, Hunan and Hubei provinces have reserves of 3-2 billion tons. Heilongjiang, Zhejiang, Jiangsu, Guizhou, Jiangxi, Yunnan, Fujian, Shanxi, Xinjiang, Jilin, Inner Mongolia, Qinghai, Gansu 13 provinces each have 2-10 billion tons of reserves, and Beijing, Ningxia, Hainan, Tibet and Tianjin each have 500-200 million tons of reserves.
Baidu encyclopedia-calcium carbonate
Baidu encyclopedia-limestone