How is salt formed and how does it come from?

There are mineral salts and salts purified from seawater.

In industry, salt is dried in seawater (also called the saltfield method) or boiled in well water or salt lake water to precipitate salt crystals. The prepared salt contains more impurities and is called raw salt. Coarse salt can be dissolved, precipitated, filtered, and evaporated to produce refined salt.

Salt contains impurities such as barium salts, chloride, magnesium, lead, arsenic, zinc, sulfate, etc. We stipulate that the content of barium should not exceed 20 mg kg. Too much magnesium and calcium in salt can make salt bitter, and too much fluoride can also cause poisoning.

In recent years, many experiments have confirmed that salt intake is associated with the development of hypertension, and excessive salt intake in the diet can cause hypertension.

In order to eliminate the harm of iodine deficiency and protect the health of citizens, the state adopts comprehensive prevention and control measures based on long-term iodized salt (hereinafter referred to as iodized salt) to eliminate the harm of iodine deficiency.

Extended Information: Things to look out for.

First, buy less and eat in time.

Buy a small amount and buy it again after eating to prevent iodine sublimation. Because potassium iodate will decompose and volatilize under the conditions of heat, light, wind and humidity.

Second, avoid high temperatures.

Avoid putting iodized salt on high temperatures when cooking soup. When iodized salt is added to the wok sauté, the consumption rate of iodine is only 10%, and the consumption rate of iodized salt in the middle is 60%. The consumption rate of iodized salt is 90%. When eating cold dishes, the consumption rate of iodized salt can reach 100%.

Third, avoid long-term storage in containers.

If iodized salt is exposed to sunlight and air for a long time, iodine can easily evaporate. It is best to put it in a stained glass bottle. Cover tightly with the back and store tightly sealed.

Fourth, avoid adding vinegar.

Iodine is destroyed when it binds to acids. According to tests, if vinegar is added at the same time as cooking, the iodine consumption rate decreases by 40% to 60%. In addition, when iodized salt meets acidic vegetables, such as sauerkraut, the consumption rate also decreases.

The general methods used are mainly moisture absorption, brine, crystallization, salt collection and salt washing.

The coarse salt obtained after evaporation is dissolved, precipitated, filtered, evaporated to obtain refined salt, and finally other elements are added according to the needs of the actual situation.

1. Absorb the tide. Nachao is actually the process of extracting raw materials for the production of raw salt. Seawater is the raw material for the production of salt, and in order to ensure the normal progress of production, we must do everything possible to ensure the quality of the raw materials.

2. Halogen. The brine concentration is gradually increased, and finally it is concentrated into saturated brine.

3. Crystallization. When the salt concentration reaches saturation, it can be precipitated in crystal form.

4. Collect salt. It is to put away the grown salt manually or mechanically.

Salt originated in China, the ancient Chinese called natural salt "halogen", and the solid crystals of salt water after manual processing were called "salt". In industry, salt is dried in seawater and salt lake water is boiled to precipitate salt crystals, and the salt prepared in this way is called coarse salt. Then dissolved, precipitated, filtered, and evaporated to obtain refined salt.

There are four major salt lakes in China, namely Qinghai Chaka Salt Lake, Qinghai Qarhan Salt Lake, Shanxi Yuncheng Salt Lake, and Xinjiang Balikun Salt Lake, ranking first in the world in salt production. Salt is the main salty taste in dishes, which has the effect of improving umami and increasing taste. The amount of salt should be appropriate, as excessive salt not only affects the taste of the dish, but also is not conducive to human health.

The raw materials** of salt can be divided into 4 categories: sea salt, lake salt, well salt and mineral salt. The salt obtained from drying seawater is called "sea salt"; The salt produced by mining modern salt lake mines is called "lake salt"; The salt prepared by using the sinking method to absorb the superficial or underground natural brine is called "well salt"; The salt obtained from the mining of ancient rock salt deposits is called "mineral salt".

Because rock salt deposits sometimes coexist with natural brine salt mines, coupled with the advent of the drilling water solution method for mining rock salt deposits, there is also a common name of "well salt" and "mineral salt" - "well salt", or generally known as "mineral salt".

In daily life, it is customary to refer to sodium chloride as "salt" for short. In addition to edible (commonly known as table salt), sodium chloride is widely used as a chemical raw material (known as industrial salt), and the statistical chronology of the National Bureau of Statistics takes "raw salt" as the general term.

China's salt production has always been dominated by sea salt, followed by lake salt and mine salt. Due to the great influence of climate on the production of sea salt, and the fact that the sea salt farms are mostly distributed in the eastern coastal areas, in order to balance and coordinate the production of salt industry, the production of mine salt and lake salt in the interior has developed rapidly in the past 10 years, so the proportion of sea salt in salt production has decreased.

Salt is the most commonly used non-metallic mineral raw material in the world, and it is a necessity for people's survival. With the development of the chemical industry, the development of new application fields and the increase of population year by year, the demand for salt is increasing, so salt occupies a very important position in the national economy and people's livelihood. Salt consumption is one of the important indicators to measure the level of industrialization of a country.

China is the world's largest salt producer, and the production of sea salt from seawater ranks first in the world. The total production of sea salt, lake salt and mine salt ranks second in the world, second only to the United States.

Salt is a chemical compound, which is generally composed of metal ions and non-metal ions, the most common are sodium chloride, calcium nitrate, ferrous sulfate, etc., sodium chloride is salt.

Where does salt come from? It is said that the temperature of the universe is constantly changing and decreasing, resulting in the production of more active sodium and chloride elements, which usually exist in nature with sodium chloride, and sodium chloride is the main component of table salt, these salts will be precipitated from the soil with volcanic eruptions and rainwater, and when the rain fades, the salt will remain on the surface of the earth and form a saline-alkali land.

In industry, seawater is used to dry salt, or well water is used to boil salt, and the water is evaporated in the heating process to precipitate salt crystals, but the salt impurity content obtained in this way is relatively large.

Sea salt is sunburned, evaporated to remove water, and sun-dried.

1. Absorb the tide. 2. Halogen. 3. Crystallization. 4. Collect salt.

Table salt refers to different sea salt, well salt, mineral salt, lake salt, soil salt, etc.

In the industry, salt is dried by seawater (also known as salt pan method) or boiled salt with well water and salt lake water to precipitate salt crystals. The table salt prepared in this way contains more impurities, which is called coarse salt. Coarse salt can be dissolved, precipitated, filtered, and evaporated to obtain refined salt.

Table salt contains impurities such as barium salts, chloride, magnesium, lead, arsenic, zinc, sulfate, etc. We stipulate that the barium content should not exceed 20mg kg. Excessive magnesium and calcium content in table salt can make the salt bitter, and high fluoride content can also cause poisoning.

In recent years, many trials have confirmed that salt intake is related to the incidence of hypertension, and excessive dietary salt intake can cause hypertension.

In order to eliminate the harm of iodine deficiency and protect the health of citizens, the state adopts comprehensive prevention and control measures based on long-term iodized salt (hereinafter referred to as iodized salt) to eliminate the harm of iodine deficiency.

Salt is a kind of substance produced by the combination of metal ions, ammonium ions, acid radicals, and non-metallic ions.

A lot of edible salt is extracted from seawater, which is obtained by drying seawater to evaporate its water to extract coarse salt, and then processing coarse Zhenglu salt into refined salt.

The purchased salt contains essential nutrients for the human body, but if we eat too much salt, it will have a lot of bad effects on our body, so we must control the amount of salt when we usually cook.

1. In China, the salt processed and produced is mainly brother god sea salt, well mine salt, and lake salt.

2. There are two causes of sea salt: one is that hundreds of rivers return to the sea, and the large and small rivers on the land dissolve a certain amount of salt, and the rivers flow into the sea endlessly. According to some data, the amount of river water flowing into the sea every year accounts for about 1/4500 of the entire seawater, and after tens of millions of years, the water continues to evaporate, inject, and reciprocate, while the salt accumulates, constituting a certain salt content of today's coarse seawater; The second is volcanic eruptions, oceanographic research has proved that submarine volcanoes are far more than terrestrial volcanoes, in the volcanic ejecta, contains soluble compounds, and its chemical composition is similar to the salts in the seawater, so there is salt dissolution dust in the seawater when the ocean is generated.

3. Causes of well salt: Mine salt resources are divided into burial.

Salt is a combination of metal ions, ammonium ions, acid ions, and non-metal ions. Salt contains nutrients that the human body needs, but it should not be eaten too much, otherwise it will cause adverse effects on our body.

Salt is a kind of metal ions, ammonium ions and acid ions, non-metallic Litan mu combined to produce a substance, it is a condiment that we often use in our lives, and most of the salty taste in those dishes is given by it.

A lot of the edible salt we usually eat is extracted from seawater, which is obtained by drying seawater to evaporate its water to extract coarse salt, and then processing coarse salt into refined salt.

The salt we buy contains essential nutrients for human nanomorphism, but if we eat too much salt, it will have a lot of bad effects on our body.