In addition to sea salt, pond salt and well salt, there were varieties of earth salt, rock salt and sand salt in ancient China. Nuzhen, who lives in the northeast of China, produced leaf salt, and a kind of "crystal salt" was discovered by ethnic minorities in the northwest in ancient times. It is said that this kind of salt is mostly produced on rocks, colorless and transparent, and it is painless to eat. Li Shizhen called this salt "Kai" in Compendium of Materia Medica. Salt is a necessity for human life. It has the functions of regulating the balance and distribution of water in human body and maintaining the balance of body fluids. Proper intake of salt is good for health. In recent years, our government has implemented universal salt iodization to prevent iodine deficiency. At present, salt is a state monopoly commodity, and iodized salt is also produced by a salt company designated by the government to ensure that it can provide qualified iodized salt for the people. There are many records about the function of salt in Chinese ancient books. For example, salt has the effects of "reducing fire, moistening dryness and expelling wind", "wiping teeth and fixing teeth, clearing away heat and infiltrating dampness" and "treating beriberi exclusively". In modern times, salt is more widely used. According to the statistics of relevant departments, there are as many as10.4 million kinds of products related to salt, and food, chemical industry, smelting, ceramics, glass, medicine and other industries are inseparable from salt. At present, the output of potash fertilizer in China is less than one tenth of the demand, and it takes a lot of foreign exchange to import potash fertilizer every year. The proven reserves of potash fertilizer in Qaidam Basin in Qinghai account for more than 90% of the country, which has become a potential economic growth point for the development of the western region. As the largest crude salt production base in China, Shandong Province has an annual crude salt production capacity of 8 million tons, accounting for about a quarter of the total national output. In addition to raw salt, Shandong's salt chemical industry and salt mariculture are also among the best in the country. The main products are refined salt, all kinds of bromine-based deep-processed products, soda ash, prawns, shellfish and Yantian organisms, and more than 60 varieties. Salt making method: salt is dried in seawater or boiled in well water or salt lake to precipitate salt crystals. The salt made in this way has many impurities and is called raw salt. Crude salt can be dissolved, precipitated, filtered and evaporated to produce refined salt. You can't eat crude salt, you can only eat refined salt.
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