The current method of extracting salt from seawater is mainly the use of seawater solar salt, which utilizes the method of separation of substances is? a

About the current method of extracting salt from seawater is mainly the use of seawater salt, which utilizes the separation of substances is?a share the following:

Sea water salt is a traditional method of salt production, the main use of the principle of separation of substances by evaporation and precipitation. Salt, in terms of classification there are well salt, sea salt, pool salt, rock salt and so on.

From the point of view of the composition includes iron, calcium, zinc, potassium, sodium, iodine and other nutrients, people use salt is a kind of salt, refers to the sodium-rich salt, that is, sodium chloride. Salt is also an important element that the human body cannot lack, and has a role in regulating human activity.

The specific steps are as follows:

1, collection of seawater:

First of all, we should collect seawater from the natural environment, and generally the collection area should be far away from the land, to avoid being polluted.

2, filtration of seawater:

Collected seawater needs to be removed from the impurities, filtering seawater can be used to use a simple wooden boards or limestone "filter pool", or the use of modern equipment such as filters or filters.

3, heated seawater:

Filtered seawater is poured directly into a pool and heated under the sun, where the water in the seawater slowly evaporates, leaving behind ions such as sodium and chlorine.

4, unclogging crystals, fishing salt residue:

After the seawater has been evaporated and concentrated for several months, there will be many crystals dissolved in the seawater, and if they are not cleaned up in time, these crystals will clog the surface layer above the salt pond, affecting the evaporation of seawater. Therefore, it is necessary to clean the salt pond by dredging the crystals and fishing the salt residue.

5. Sun-drying and harvesting:

After a long wait and careful care, during the evaporation of seawater, the ion concentration reaches a certain standard and the remaining seawater becomes more and more concentrated. When the salt content reaches a certain level, a large number of white crystals will appear, and these white crystals are the table salt we need. At this point, by drying these crystals and collecting them, you can get high quality sea salt.

In a nutshell, sea salt drying mainly utilizes the principle of evaporation and precipitation separation of substances, through the continuous evaporation of water in seawater, so that the concentration of salt gradually increases until it can be condensed into salt crystals. Eventually, the salt crystals are picked up and dried to obtain salt. Because of the simplicity and low cost of this method, it is still widely used in some areas.