In the production of sea salt in China, the salt drying method is generally adopted, which is also called "beach salt drying method", that is, the coastal beach is used to build a dam to open up a salt field, and seawater is pumped by tidal waves to attract seawater to fill the pool, which is evaporated by sunlight into brine. When the concentration of brine evaporates to 25 degrees Pompeii, sodium chloride precipitates out, which is the original salt.
The production of crude salt by solarization has the advantages of energy saving and low cost. However, due to the influence of geography and climate, it is impossible to build salt pans on all coastal beaches, and it is impossible to dry salt in all seasons. Air drying, long sunshine time, large evaporation and high salt production, on the contrary, low production. In salt fields in northern China, only March to165438+1October is the salt drying season.
Extended data
Sea salt can supplement trace elements in human body. No matter what kind of food contains trace elements, it is limited. At present, sea salt contains the most trace elements, which is determined by the production technology and raw materials of sea salt.
The production process of sea salt is to bring seawater into the beach field and use natural conditions such as sunlight and wind to evaporate and concentrate the precipitated sodium chloride. The production process is pure natural green products. In the process of sea salt precipitation, trace elements in seawater will also be brought out with the precipitation of sodium chloride.
Seawater contains more than 80 kinds of elements, most of which are beneficial elements, because it is a slow process from seawater concentration on the beach to sodium chloride crystallization and precipitation, which takes about one year. During this period, most of the heavy metal elements in the concentrated seawater were greatly reduced.
On the one hand, heavy metals are deposited and concentrated at the bottom of the pond during seawater concentration. Second, different algae grow in the primary concentration ponds along the coast and in the tidal flat, including cyanobacteria, brown algae, green algae, red algae, diatoms and so on. These algae adsorb copper ions, cadmium ions, lead ions, nickel ions, zinc ions, tin ions and copper ions.
Therefore, sea salt is not only a simple condiment, but also the best supplementary source of trace elements in human body. Choosing sea salt to supplement the deficiency of trace elements in food can balance the human body's demand for trace elements.
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