Method for extract salt from seawater

The method for extract salt from seawater is as follows:

1, solar evaporation method: it is a very old salt-making method, and it is also a common method still in use at present. This method is to build many ponds similar to rice fields on the shore for drying salt. The process of salt making includes moisture absorption, brine making, crystallization, salt mining, storage and transportation. Tidal absorption is to accumulate seawater with high salt content in the restored salt field.

2. Frozen salt production: it is a technology for producing sea salt in high-latitude countries, such as Russia and Sweden. The principle of this method is that seawater freezes when it is cooled to the freezing point of seawater. The ice formed by seawater has little salt and is basically pure water. Removing water is equivalent to evaporation of water in salt dry process, and the remaining concentrated brine can be used to make salt.

3. Electrodialysis is a new salt-making method with the development of seawater desalination industry. It makes full use of a large number of "mother liquor" with high salt content produced by seawater desalination as raw materials to produce salt. Compared with salt field method, electrodialysis method saves a lot of land, is not affected by seasons, has less investment and saves manpower.

Brief introduction of seawater salt drying;

1, salt drying in seawater refers to a series of processes of evaporating water in seawater 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.

2. In the past, the method of plane evaporation was used to dry salt by seawater evaporation, and the contact area between salt water and flowing air containing unsaturated water vapor was limited to the plane area of salt field. The method of spraying salt water at a certain height or at a certain pressure and height expands the contact area between salt water solution and flowing air containing unsaturated water vapor in a three-dimensional way.