Because its salt crystals contain minerals, the salt crystals are blue-black, and the salt particles are large and pure, and the salt taste is mellow, so it is an ideal edible salt. But it contains many impurities, such as sediment, gypsum, mirabilite and so on. These impurities are undesirable in edible salt. Therefore, the salt in Qinghai Lake needs to be refined or purified to become edible salt.
The salt in Qinghai Lake is crude salt, which is the crystallization of seawater or brine in salt wells, salt ponds and salt springs after frying and drying, that is, natural salt, which is unprocessed large-grain salt. The main component is sodium chloride, but it is easy to deliquesce in the air because of impurities such as magnesium chloride, so pay attention to humidity when storing.
Introduction of China Sea Salt Production Method
Sunbathing method, also known as beach sunbathing method, is to use coastal beaches to build dams and open salt pans, draw water through moisture absorption, attract seawater to fill pools, and turn them into brine through sunlight evaporation. When the concentration of brine evaporates to 25 Baume degrees, sodium chloride precipitates out, which is the original salt. The process of producing crude salt by solarization is generally divided into four processes: absorbing moisture, making brine, crystallizing and collecting salt.
After the production of sea salt is completed, it will be piled up manually or mechanically. In order to maintain the unique characteristics of sea salt, Tianjin Hangu Salt Factory adopted the only domestic vacuum salt-making technology of saturated brine in salt fields to retain beneficial elements such as calcium, potassium and magnesium in seawater to the maximum extent. When the raw brine enters the production system, it must go through more than ten processes, such as yarn filtration, membrane filtration, evaporation, crystallization and separation, and finally form the product.