The process of salt tanning in seawater other than evaporation? Thanks!

Salt drying in seawater is one of the most traditional salt production practices, commonly known in China as the salt field method.

The main process is:

The salt field is generally divided into two parts: the evaporation pool and the crystallization pool. Seawater is first introduced into the evaporation pool, the sun evaporates water to a certain extent, and then poured into the crystallization pool, continue to sunlight, seawater will become a saturated solution of salt, and then sunlight will gradually precipitate salt.

If a little more detailed, there is a bitter brine precipitation process, because seawater in addition to salt, but also contains a lot of other substances, especially magnesium chloride (also an important chemical raw material), this thing has a great impact on the quality of salt, because of the taste of very bitter, so it is called the bitter brine.

Modern processing technology includes:

Sea water - evaporation crystallization - precipitation of bitter brine (containing magnesium ions, bromide ions, iodine ions, etc.) and crude salt (containing sodium ions, chloride ions, magnesium ions, sulfate ions, etc.), to where Crude salt is obtained.

If you want to get pure salt, you have to add barium chloride, sodium hydroxide and sodium carbonate in turn. Remove impurities - filter - get precipitate and filtrate - add dilute hydrochloric acid solution - evaporation and crystallization --Get pure salt (sodium chloride)