What is the phenomenon of using seawater to dry salt?

The drying of salt in seawater is a physical change. Salt drying in seawater refers to the evaporation of water in seawater through a series of processes to obtain sea salt. The traditional method of extracting salt from seawater is "salt field method". The enhanced evaporation method of seawater salt drying relates to liquid evaporation technology. The main method of extracting salt from seawater is "salt field method", which is an ancient method and is still widely used today. In this way. We should choose large flat beaches and build salt pans in areas with mild climate and abundant sunshine.

Seawater-evaporative crystallization-bittern precipitation (containing magnesium ions, bromine ions, iodine ions, etc. ) and crude salt (containing sodium ion, chloride ion, magnesium ion, sulfate ion, etc. )-Barium chloride, sodium hydroxide and sodium carbonate are added in turn. Removing impurities, filtering to obtain precipitate and filtrate, adding dilute hydrochloric acid solution, evaporating and crystallizing to obtain pure salt (sodium chloride).