CN1395470A

CN1395470A - Method for manufacturing pure salt

Info

Publication number: CN1395470A
Application number: CN01803722A
Authority: CN
Inventors: 吴圣恩; 金鸿
Original assignee: Hoseo University
Current assignee: Hoseo University
Priority date: 2000-01-12
Filing date: 2001-01-12
Publication date: 2003-02-05
Also published as: KR100427012B1; WO2001067893A1; US20030012726A1; KR20010069159A

Abstract

Provide is a method for manufacturing pure salt. The pure salt manufacturing method includes the steps of heating solar salt at 200 DEG C to dry moisture contained therein, placing the dried salt in a heating kiln and heating the same at 1300 DEG C to be liquefied for primary melting, diluting the molten salt with clean water to sediment heavy metals or impurities contained therein, separating only brine from the resulting material and heating the same to evaporate moisture contained therein, heating moisture-evaporated salt to produce crystallized salt, placing the crystallized salt in the heating kiln and heating the same at 1500 DEG C for secondary melting, diluting the secondarily molten salt with clean water to secondarily sediment heavy metals or impurities contained therein, separating unsedimented brine and heating the same to produce crystallized salt, placing the crystallized salt in the heating kiln and heating the same at 1800 DEG C for third melting, diluting the thirdly molten salt with clean water to sediment impurities contained therein, separating unsedimented brine and heating the same to produce crystallized salt, placing the crystallized salt in the heating kiln and heating the same at 2000 DEG C for fourth melting, separating an upper layered portion of the molten salt from a lower layered portion, coagulating the separated molten salt and pulverizing the coagulated salt to produce powdered salt. Thus, various heavy metals contained in solar salt are effectively removed, thereby obtaining harmless salt.

Description

Produce the method for pure salt

Technical field

The present invention relates to the preparation method of salt, relate in particular to by from solar salt shan, removing various impurity and prepare the method for nontoxic pure salt such as heavy metal.

Background technology

By making solar salt shan from evaporation of seawater water.Recently, because pollution of the sea, the solar salt shan that makes with contaminated seawater contains each heavy metal species composition or impurity.Known multiple finished salt, they prepare by removing impurity contained in the solar salt shan, and its working method also is known.The salt that known process is crossed comprise reproduce salt, smoke salt, wash salt manufacturing, bamboo salt, purified salt etc.

Reproduce salt by solar salt shan is water-soluble, in 100-200 ℃ of boiling dissolved solar salt shan and recrystallization in pot.But the shortcoming of reproducing salt is effectively to remove heavy metal or impurity.

The preparation of smoking salt is at first to toast solar salt shan 1-4 hour at 400-450 ℃ in the reaction and drying stove, and second 550-600 ℃ of baking 30 minutes to 4 hours, and the 3rd 700-800 ℃ of baking 4 hours.Organic substance and arsenic (As) are removed in first baking procedure basically.Oxide compound and cadmium (Cd) are removed at second baking procedure, and the oxide compound of plumbous (Pd), heat-stable organic substance or calcic (Ca) or magnesium (Mg) is removed at the 3rd baking procedure.But this method has related to the operation of complicated adjusted stepwise temperature.More disadvantageously, if every Buwen's degree is regulated out of true, objectionable impurities can not be removed, and has only removed mineral substance.

Wash salt manufacturing by pulverizing, washing, dehydration and dry preparation, thereby the content of insoluble substance is lowered to 0.02% or lower, magnesium chloride and sodium sulfate are reduced to 0.05% or lower.Wash salt manufacturing and have bigger crystallization and hard.Therefore, when washing salt manufacturing itself when the food grade salt, when its add when grinding prevent that salt agglomerative additive from using the time, it becomes and is not suitable as food grade salt.

The preparation of bamboo salt is that solar salt shan is placed thick bamboo tube, with the opening of clay sealing thick bamboo tube, repeats to toast the thick bamboo tube 8 times of sealing in 1000-1300 ℃ pot.Spray rosin powder improves storing temperature on the fire of wood combustion then, 1300-1700 ℃ of baking.At this, contained elements A s combines with iron in sulphur, rosin or the bamboo and is converted into alkaline matter in the solar salt shan, and it helps human body.But by heating solar salt shan in higher temperature, heavy metal or impurity contained in the solar salt shan can not be removed fully.

The preparation of purified salt is by seawater being passed through ion-exchange membrane, only extracting NaCl, is highly purified.In addition, because purified salt is impure hardly, that is, highly cleans, and have the constant size, it is widely used as family, food or factory level salt.But the production of purified salt is disadvantageous method on energy consumption.

Summary of the invention

In order to address the above problem, the purpose of this invention is to provide a kind ofly by removing contained method of producing pure salt in the solar salt shan fully such as the impurity that is harmful to human body of heavy metal, this salt is nontoxic and delicious.

To achieve these goals, a kind of method of producing pure salt is provided, comprise step: solar salt shan is placed heating and drying furnace, contained moisture in predetermined temperature heat drying solar salt shan, place the liquefaction of heating and drying furnace heat that it is melted first exsiccant salt, water dilution fused salt with cleaning, contained heavy metal or impurity in the deposited salt, from the material that obtains, only isolate salt solution, contained moisture content in the heating evaporation salt solution, heating evaporation the salt of moisture to generate crystal salt, place heating and drying furnace it to be melted for the second time crystal salt in the temperature heating molten higher than head, the water dilution fused salt second time with cleaning, precipitate wherein contained heavy metal or impurity for the second time, separate unprecipitated salt solution and heating generation crystal salt, crystal salt is placed heating and drying furnace and in the temperature heating higher than fusing for the second time it melted for the third time, water with cleaning dilutes fused salt for the third time, precipitate wherein contained impurity, separate unprecipitated salt solution and heating generation crystal salt, crystal salt is placed heating and drying furnace, make its 4th time fusing in the temperature heating higher than fusion for the third time, the top section of melting salt is separated with underclad portion, the isolating melting salt that condenses grinds agglomerative salt and generates powder salt.

In the method for pure salt produced according to the invention, heating, precipitation repeat with separating and melting, and the fusing step is carried out with the Heating temperature that rises gradually, can remove heavy metal contained in the various solar salt shans and impurity in per step, finally removes fully.

Description of drawings

With reference to accompanying drawing, by a detailed description of the preferred embodiments, above-mentioned purpose and advantage of the present invention will become more obvious, wherein:

Accompanying drawing 1 is the schema of the method for pure salt produced according to the invention.

Embodiments of the present invention

Hereinafter the preferred embodiment of the invention will be described.

Solar salt shan is placed heating and drying furnace, about 200 ℃ temperature heating 1 hour with dry solar salt shan in contained moisture.Exsiccant salt places heating and drying furnace to liquefy to carry out the fusing first time 1300 ℃ of heating again.Fused salt dilutes with heavy metal contained in the deposited salt or impurity with the water of cleaning.From the material that obtains, only separate salt solution, be heated transpiring moisture, thereby obtain crystal salt.

Place heating and drying furnace to carry out the fusing second time crystal salt 1500 ℃ of heating.The salt of fusing with heavy metal contained in the deposited salt or impurity, only separates salt solution with the water dilution of cleaning from the material that obtains for the second time, generates crystal salt by it.

Place heating and drying furnace to melt for the third time crystal salt 1800 ℃ of heating.The salt of fusing with precipitated impurities, therefrom only separates salt solution with the water dilution of cleaning for the third time, generates crystal salt by it.

Then, place heating and drying furnace to carry out the 4th fusing 2000 ℃ of heating crystal salt, then the top section of melting salt is separated with underclad portion, isolating melting salt condenses.Grind agglomerative salt and generate powder salt.

Another embodiment of the invention is described now.

Solar salt shan is placed heating and drying furnace, 1200 ℃ of heating, fusion, sterilization then.Melting salt heats so that swim in the impurity that will the be removed burning of the top section of melt solution at 1500 ℃.Only separate 1/3rd remaining melting salts.This process triplicate is to extract pure salt.The pure salt that condenses and extract grinds then and makes powder salt.

As mentioned above, the method for pure salt produced according to the invention, fusion, precipitation and separate and repeat to remove each heavy metal species and impurity contained in the solar salt shan thus fully, thereby to obtain harmless salt for several times.In addition, once can produce a large amount of salt, therefore improve productivity.

Commercial Application

In salt production method according to the present invention, effectively remove solar salt by the processing solar salt In contained heavy metal or other impurity and produce pure salt. So the salt of preparation not only can be used as Food grade salt also can be used as additive and is used for medicine or medicinal product, cleans eyes and treatment Or prevention mouth disease. In addition, this salt itself can be used for removing internal organ refuse or massage skin.

Claims

1, a kind of method of producing pure salt comprises step:

Solar salt shan is placed heating and drying furnace, contained moisture in 200 ℃ of heat drying solar salt shans;

Place heating and drying furnace it to be melted first exsiccant salt 1300 ℃ of heating liquefaction;

Water with cleaning dilutes fused salt with heavy metal contained in the deposited salt or impurity;

From the material that obtains, only isolate salt solution, contained moisture content in the heating evaporation salt solution;

Heating evaporation the salt of moisture to generate crystal salt;

Place heating and drying furnace it to be melted for the second time crystal salt 1500 ℃ of heating;

With the water dilution of cleaning for the second time fused salt with wherein contained heavy metal or the impurity of precipitation for the second time;

Separate unprecipitated salt solution and heating generation crystal salt;

Crystal salt is placed heating and drying furnace and 1800 ℃ of heating it melted for the third time;

Water with cleaning dilutes fused salt for the third time with the wherein contained impurity of precipitation;

Separate unprecipitated salt solution and heating generation crystal salt;

Crystal salt is placed heating and drying furnace, make its 4th time fusing 2000 ℃ of heating;

The top section of melting salt is separated with underclad portion;

Isolating melting salt condenses; With

Grind agglomerative salt and generate powder salt.

2, a kind of method of producing pure salt comprises step:

Solar salt shan is placed heating and drying furnace,, then melting salt is sterilized at 1200 ℃ of heating and meltings;

Melting salt is heated so that swim in the impurity that will the be removed burning of the top section of melt solution at 1500 ℃;

Only separate 1/3rd remaining melting salts and repeat said process for several times to extract pure salt; With

The pure salt that condenses and extract grinds then and makes powder salt.