This post was last edited by chen-jun-1024 on 2010-11-5 14:15 Industrial salt is also called "sodium chloride". It is widely used in industry and is one of the most basic raw materials in the chemical industry. It is called the "mother of the chemical industry". Among the main products of the basic chemical industry, hydrochloric acid, caustic soda, soda ash, ammonium chloride, chlorine, etc. are mainly produced using industrial salt as raw materials. Large amounts of sodium chloride are needed in the organic synthesis industry. In addition, it is also used in soap manufacturing, ceramics, glass production, daily chemicals, oil drilling, drilling working fluids, completion fluids, petrochemical dehydration fluids, early strength agents in the construction industry, coagulants in the production of coatings, latex coagulants in the rubber industry, and additives in the paper industry. Additives and deinking of waste paper, inorganic chemical raw materials and sulfate removal agents in the chemical industry, coagulant of sodium alginate, prevention and control of rot of wheat, apples, cabbage, etc. and food preservatives, preparation of metallic sodium and other sodium compounds, steel heat treatment medium, etc. Salt is also widely used in water treatment, road snow removal, refrigeration and refrigeration, etc. In the chemical industry, a large amount of raw salt and processed salt are used as raw materials to produce chemical products such as chlorine, bleaching powder, caustic soda and soda ash. The main components of salt are chlorine and sodium. The "salt" used for food and the "salt" used in industry have the same chemical composition, but they have different uses. Because raw salt is a product of nature, refined salt is also obtained by simple processing of raw salt. In addition to the main component sodium chloride, it also contains a variety of impurities, so it cannot be called sodium chloride. Instead, only one word "salt" is used by convention to specifically refer to products with sodium chloride as the main component, such as raw salt, sea salt, well salt, rock salt, iodized salt, non-iodized salt, refined salt, large salt, crushed salt, washed salt, etc. If it is a salt with other chemical components, be sure to name its specific trade name or chemical name, such as soda ash, baking soda, red vitriol, anhydrous sulfate, potassium nitrate, potassium chloride, diammonium hydrogen phosphate, etc. It must not be called "industrial salt" in general. According to the classification of raw materials for the production of salt products, it can be divided into three categories: sea salt, mine salt and lake salt. 1. Sea Salt China is the second largest salt-producing country in the world, and its sea salt content ranks first in the world. China's coastline, starting from the mouth of the Yalu Salt Farm in the north to the mouth of the Beilun River in Guangxi in the south, is more than 18,000 kilometers long and is the main distribution area of the sea salt bittern industry. With the Yangtze River as the boundary, the salt areas in the five provinces of Liaoning, Hebei, Tianjin, Shandong and Jiangsu to the north of the Yangtze River are called the northern sea salt area. ; The salt areas in the five provinces of Zhejiang, Fujian, Guangdong, Guangxi and Hainan south of the Yangtze River are called the Southern Sea Salt Area. The northern sea salt area is suitable for large-scale production of sea salt due to its better climate and tidal flat conditions, and is the main body of domestic sea salt production. The sun-dried salt production mother liquor is called bittern, which is rich in potassium, magnesium, bromine and other elements in seawater, and is the raw material for extracting a variety of chemical products. 2. Mine salt China’s mine salt areas include provinces and cities such as Sichuan, Hubei, Hunan, Yunnan, Jiangxi, Henan, Chongqing and Anhui. In addition, mineral salt is also found in Jiangsu, Shandong, Guangdong, Gansu, Shaanxi and other provinces. In recent years, the annual output of mine salt has reached more than 1,000 tons, accounting for more than 1.4% of the country's total salt production. 3. Lake Salt China has many salt lakes * * . Starting from the Greater Hinggan Mountains in the northeast, along the Yinshan Mountains - the salt field at the eastern end of the Qilian Mountains - the northern part of the Gangdise Mountains, there are nearly a thousand salt lakes with an area of more than 1km². Qinghai, Xinjiang, Inner Mongolia and Tibet are the four provinces and regions with the most concentrated distribution of salt lakes in China, and are also the areas with the most concentrated distribution of salt lakes in the world. As the main salt used in northwest China, lake salt has developed rapidly in recent years, with output reaching more than 3 million tons.