1, sea salt: sea salt is the most common source of salt, and its production process is mainly to extract salt from seawater by drying or evaporation. The salt drying method is to introduce seawater into the salt field, use the sun and wind to evaporate water, and finally leave salt particles. Evaporation method is to introduce seawater into the salt field and evaporate the water by heating, leaving salt. The quality of sea salt varies with the purity of the sea water from which it comes. Generally speaking, the purer the seawater, the better the quality of sea salt.
2. Well salt: Well salt is mined from underground saline aquifer. Under suitable geological conditions, groundwater will dissolve a large number of minerals, including sodium chloride. Well salt can be extracted by pumping groundwater through drilling and then extracting salt through evaporation and crystallization. The quality of well salt also varies with the mineral content of groundwater.
3. Lake salt: Lake salt mainly comes from inland salt lakes. Salt Lake is a lake rich in minerals. Usually due to geological movement or climate change, water evaporates, and minerals dissolved in water gradually precipitate to form salt. The method of mining lake salt is similar to sea salt, and salt is extracted by sun drying or evaporation. The quality of lake salt is also affected by the geological and climatic conditions of the salt lake.
4. Mineral salt: Mineral salt is mined from underground salt mines. Salt mine is a kind of mineral containing a lot of sodium chloride, which is usually associated with other minerals. After mining salt ore, it is necessary to crush and screen the ore to extract salt. The quality of mineral salt is influenced by the geological conditions of salt mine.
Matters needing attention in buying salt
1. Choose formal channels: Choose reputable merchants and formal channels to buy salt, such as large supermarkets and food specialty stores. Avoid buying bulk salt or fake and inferior products with unknown sources.
2. Check the packaging: When buying salt, pay attention to check whether the packaging is intact, and whether the information on the packaging such as production date, shelf life, manufacturer, address and contact number is complete. Choose products with shorter production date to ensure fresh salt.
3. Inspection marks: The packaging of regular salt products should have "QS" quality and safety marks and "GB/T 546 1" national standard marks. In addition, you can also check the origin, raw materials, quality grade and other information of salt, and choose the product that suits you.