1: sea salt
Sea salt is the oldest salt-making method. The salt crystallized from seawater after evaporation by sunlight can produce 27 kilograms of salt per 1000 kilograms of seawater, most of which are white, but also a small amount of yellowish brown, grayish brown and reddish.
Sea salt comes from the shallow surface, which is easy to be polluted. There are many impurities in raw materials, which are constrained by cost and processing technology. These impurities are not easy to remove, and the purity is lower than that of mineral salt. Because it is directly baked in seawater, there are many trace elements and it is not easy to agglomerate, so it is generally unnecessary to add anti-caking agent.
2. Lake salt
Lake salt, also known as "pool salt", is made by drying raw materials of inland saltwater lakes or salt lakes in salt fields, and the general process is basically the same as sea salt. Generally, the salt content in salt lakes is more than 3.5%. Due to the different mineral components and algae in the lakes, the salt fields show colorful colors such as cyan, white, red, blue and black under the combined action of high temperature and light. Lake salt, like sea salt, is distributed in shallow layer, with more impurities and less purity than mineral salt, but because of its large size.
3. Well mineral salt
Well salt is the salt obtained by extracting shallow surface or underground natural brine by sinking method. The depth of the well is shallower than that of the rock mine, generally ranging from tens of meters to hundreds of meters. You know, what you take out of the well is not massive salt, but dark and thick bittern. Boil this brine in a big pot and you will get the white salt in our eyes. But sometimes, rock salt deposits sometimes coexist with natural brine salt deposits, and with the advent of drilling water solution method for mining rock salt deposits, in some places, they are called "well salt" or "mineral salt" in general.