There are these methods of making edible salt: the sun salt method, the salt burning method, the evaporation crystallization method, the compression crystallization method and so on.

One, the sun-dried salt method

The natural seawater or underground salt water is poured directly onto a flat salt field, allowing the water to evaporate, leaving behind the sun-dried salt. This is the most primitive method of salt production and one of the simplest.

Two, burning salt method

The natural seawater or underground salt water poured into the pot, with high temperature heating and evaporation of water, leaving the formation of salt blocks. This method is called the "fire method" and is a moderately difficult method of making salt.

Three, evaporation and crystallization method

The brine will be evenly added to large-scale evaporation and crystallization apparatus, through the heating and continuous evaporation, the ions gradually crystallized, so that the salt is separated. This method requires specialized equipment and skills, and careful control of temperature, concentration and other factors.

Four, compression crystallization method

The brine is attacked into a high-pressure environment and the water is evaporated with a high-pressure evaporator, so that the salt is analyzed and made into various shapes of salt. This method requires a high degree of technical and equipment support and is usually used for industrial salt production.

Types of edible salt:

1, well salt: well salt, by drilling a well to extract the underground brine made of salt is called well salt. Well salt, there are wells to have salt. Unlike sea salt and lake salt contained in the water, well salt is buried in the ground, to mine well salt, the first thing to do is to drill a well.

2, sea salt: sea salt is a kind of edible salt, is the introduction of seawater into the salt flats, after the sun, evaporation, crystallization and become. It is characterized by not adding any anti-caking agent.

3, pool salt: pool salt, also known as lake salt, is one of the earliest salts discovered and exploited by the ancestors.

4, rock salt: rock salt, chemical composition of sodium chloride, crystals are isometric crystal system hexahedral crystal halide. In the salt lake or lagoon with potassium rock salt and gypsum *** birth. Rock salt can be used as food seasoning and preservatives, is an important chemical raw material.

Reference for the above: Baidu Encyclopedia-Edible Salt