KR20180023930A - Manufacturing Method of natural salt using sea water - Google Patents

Abstract

The present invention relates to a manufacturing method of natural salt using sea water which comprises the following: a water purifying step of filtering sea water to remove impurities contained in the sea water; an ozone sterilizing step of sterilizing the seat water by supplying ozone to the sea water; a crystallizing step of spraying the sea water onto a salt crystal plate and heating and crystallizing the same into salt; a moisture drying step of drying and removing moisture of the crystallized salt; and an impurity removing step of removing impurities from the crystallized salt. The present invention provides a manufacturing method of natural salt using sea water capable of mass-producing natural salt having the quality equivalent to that of bay salt by using sea water at lower costs.

Description

{Manufacturing Method of Natural Salt using sea water}

The present invention relates to a method for producing a natural salt using seawater.

The salt commonly used is sodium chloride (NaCl), which is divided into edible and industrial. The edible salt is widely used in everyday life such as food seasoning and salting in the home, such as food manufacturing and processing, and industrial salt is widely used in various fields of industry.

Salt is produced from seawater, rock salt, salt or underground functions as raw materials and can be classified into sun salt, rock salt, purified salt or disinfectant depending on the production method. Salt accounts for two-thirds of the world's consumption of salt, salt and salt, which is produced by evaporation of seawater in our country, is traditionally preferred and widely used because it harmonizes with our food.

Since 2008, Korea has been recognized as a food source of minerals and is produced in the natural state in the tidal flats. As a rare resource worldwide, interest and demand are increasing, and there is a demand for a technology to produce higher quality sun salt.

The method of producing sea salt in a salt troposphere does not prevent the inflow of pollutants contained in seawater and impurities such as sand, mud, and other insoluble matter by producing the surface sea water of the coast under the outdoor conditions exposed to the pollution. In addition, the bottom surface of salt crystals of salt is composed of PVC laminate, P.V.C., P.P. The bottom material of the system is oxidized and corroded, and harmful components which are not suitable for the food are eluted and decomposed and are introduced into the sun salt. In addition, the method of producing the salt from the salt is limited in terms of the production time limit and the increase of the production amount, so that it is limited to the high quality salt demand of the rapidly growing food market.

On the other hand, the purified salt is produced by crystallizing only pure sodium chloride in seawater. Since the purified salt is made of pure sodium chloride in which all the minerals are completely removed, the sodium chloride content is high and the salty taste is strong, and the demand is not increased due to the lack of harmony with our food.

The present invention provides a natural salt production method using seawater capable of mass production of a natural salt having a quality equivalent to that of sun-salt by using seawater at a lower cost.

The present invention also provides a method for producing a natural salt using seawater in which the inflow of impurities or harmful components is fundamentally blocked or minimized, and the loss of mineral components is minimized.

The method for producing natural salt using seawater according to the present invention is characterized by including a purification step of filtering a function to remove impurities contained in the function, and a crystallization step of spraying, spraying and heating the function to crystallize into salt .

The natural salt production method using the seawater may further include a water drying step of drying and removing the moisture of the crystallized salt after the crystallization step, wherein the ozone sterilizing step of sterilizing ozone by supplying ozone to the function is performed after the purification step, The foreign substance removing step for removing the foreign substance from the crystallized salt proceeds, and the ultraviolet sterilizing step for sterilizing the salt by irradiating the salt after the foreign substance removing step may be performed.

In addition, the natural salt production method using seawater may include a first filtering step of filtering the function using a screen filter, and a step of storing the filtered function in a sedimentation tank for a predetermined time to precipitate non- A filtration step of passing the function through a filtration layer formed of sand and activated carbon to remove impurities, and a second filtration step of filtering the function by using a hollow fiber membrane filter, Process.

The crystallization step may include a function injection step of injecting the function into the salt crystal plate and a function crystallization step of crystallizing the function, and the function injection step and the hydrate crystallization step may be carried out sequentially or concurrently.

The functional crystallization process may be performed by heating the above-mentioned function at a crystallization temperature of 80 to 200 ° C, spraying the above function to a heating plate heated to the above crystallization temperature, or heating the above-mentioned crystallization temperature after the above- .

Also, in the moisture drying step, the salt is heated to a drying temperature of 80 to 150 ° C. to dry and remove moisture contained in the salt, and the salt is removed by a far infrared ray lamp, a far infrared ray ceramic heater, .

The natural salt production method using seawater according to the present invention produces a natural salt by spraying water treatment and disinfection function from seawater so that the mineral component contained in seawater is preserved and the loss of mineral component is minimized, There is an effect that a natural salt can be produced.

In addition, the natural salt production method using seawater according to the present invention produces a natural salt which is instantly crystallized by spraying or spraying a concentrated salt water-containing function on a salt crystal plate after a water treatment, sterilization and disinfection treatment, so that impurities or harmful components It is possible to fundamentally block or minimize the occurrence of the problem.

In addition, in the method for producing natural salt using seawater of the present invention, functional natural salt having various functions can be produced by adding various functional materials to a function purified by seawater.

In addition, the natural salt production method using seawater according to the present invention regulates the amount of spraying of the function by spraying concentrated water from the seawater into fine particles and crystallizing the sprayed functional particles instantaneously or in a short time to produce a natural salt There is an effect that the size of the natural salt crystal particles produced by controlling the size of the sprayed functional particles can be varied.

1 is a flow chart of a method for producing natural salt using seawater according to an embodiment of the present invention.
2 is a configuration diagram of an apparatus for producing natural salt using seawater according to an embodiment of the present invention.
3 is a specific configuration diagram of the integer module of FIG.
FIG. 4 is a configuration diagram of a transfer heating module in which the transfer module and the heating module shown in FIG. 2 are formed integrally.
FIG. 5 is a configuration diagram of a transfer heating module according to another embodiment corresponding to FIG. 4;

Hereinafter, a method for producing natural salt using seawater according to an embodiment of the present invention will be described with reference to the accompanying drawings.

First, a natural salt production method using seawater according to an embodiment of the present invention will be described.

1 is a flow chart of a method for producing natural salt using seawater according to an embodiment of the present invention.

1, a method of manufacturing natural salt using seawater according to an embodiment of the present invention includes steps of integrating step S10, sterilizing step S20, crystallizing step S30, drying moisture S40, (S70). The natural salt production method using the seawater may further include a foreign substance removal step (S50) and an ultraviolet sterilization step (S60).

The natural salt production method using the seawater uses a function that is concentrated from seawater or seawater and has a salt concentration of at least a predetermined level, and preferably, a natural salt is prepared using a function of a salt concentration of 21 wt% or more. Also, the function may be a function having a salinity of 10 or more and preferably 20 or more. In addition, the function may be a function derived from a salt evaporation site producing a conventional salt, or a condensed water or seawater by directly evaporating seawater. In the following description, the function is produced by evaporating seawater. It can be used to mean sea water.

The integer step S10 is a step of filtering the function to remove impurities contained in the seawater or the function. The impurities may be components such as sand, gravel, suspended solids, various organic substances, and other insoluble substances. The above function may include various harmful impurities due to evaporation of seawater by bringing it out of the salt evaporation site producing the existing sun salt. Therefore, the seawater or the function must remove impurities before crystallization into salt. On the other hand, the integer step S10 may be omitted when the seawater or the function contains no impurities.

The purification step S10 may be performed by various processes or a plurality of processes for removing impurities. For example, the integer step S10 may be a primary filtering step, a precipitation step, and a filtration step. The primary filtering process filters the function using at least one screen filter. The first filtering process filters and removes impurities of a relatively large size included in the function. The screen filter is formed to have an appropriate mesh according to the size of the impurity contained in the function. In addition, the screen filter may be formed of a plurality of filters having different meshes. In the precipitation step, the filtered function is stored in a sedimentation tank for a predetermined time to precipitate and remove non-soluble impurities having a specific gravity higher than that of the function. Floating impurities are removed by flocculation and aggregation. In addition, the precipitation step previously removes components precipitated before the salt crystallization contained in the function. The filtration process passes a function through the filtration layer formed of sand and activated carbon to remove fine impurities that have not been removed in the course of the filtration. The average diameter of the sand is about 0.5 to 2.0 mm. The filtration process removes impurities of 0.1-1 mm in size.

Also, the integer step S10 may further include a second filtering step. The second filtering process filters the function using a hollow fiber membrane filter. The hollow fiber membrane filter passes the beneficial minerals to the human body and removes harmful components such as fine impurities, heavy metals, and bacteria. In addition, the second filtering process may filter the function using the reverse osmosis filter.

The sterilization step (S20) is a step of sterilizing the function by ozone treatment. The sterilization step (S20) removes ammonia, trihalomethal, odor or virus contained in the function by using the sterilizing power of ozone. The method of supplying ozone may be a general method applied in the purification process. For example, the ozone may be supplied to the function in the form of bubbles or nanobubbles. The sterilization step (S20) may preferably proceed for about 3 to 10 minutes. The function processed in the sterilization step (S20) has a water quality satisfying the drinking water quality standard, except for the salinity component.

The crystallization step (S30) is a step of injecting a function and heating and crystallizing it into salt. At this time, the produced salt is formed into a pure natural salt containing almost no impurities and containing a mineral component. The crystallization step (S30) may be separated into a function injection process and a water crystallization process and proceed sequentially. The function is sprayed by means of spraying or spraying means, such as a nozzle, and is preferably sprayed in the form of droplets of fine water droplets. The above function is sprayed or sprayed onto a salt crystal plate such as a rotary conveying belt, a cylindrical rotary plate or a continuous rotary type circular plate, and is heated to a crystallization temperature of 80 to 200 DEG C and crystallized into a salt. In the crystallization step (S30), the functional injection process and the functional crystallization process may be performed at about the same time. At this time, the salt crystal plate such as the conveyance belt, the cylindrical rotary plate, or the continuous rotary type circular plate maintains the preheated state at the crystallization temperature of 80 to 200 ° C. That is, the water is evaporated and crystallized to be formed of salt while being contacted with the salt crystal plate while being sprayed. The above-mentioned function is contacted with the salt pre-heated to the crystallization temperature while being sprayed, so that water can be evaporated and crystallized into salt. If the crystallization temperature is too low, the crystallization of the function may be insufficient or may take a long time to crystallize. If the crystallization temperature is too high, moisture may evaporate within a very short time and crystallization of the salt may become incomplete.

The function may be sprayed by a nozzle in a spray or spray spray manner. The nozzle may be a general nozzle used for spraying water, and may preferably be formed of a corrosion-resistant stainless steel or ceramic material.

The crystallization step (S30) may adjust the particle size of the salt to be crystallized by adjusting the droplet size of the sprayed function or the amount of the sprayed function. The salt may be formed to have a size of about 0.1 to 2 mm. For example, when the function is sprayed in the form of a fine water droplet, the size of the salt to be crystallized becomes small. Also, when the water drop size of the function is large, the particle size of the generated salt is also large. Therefore, the salt to be crystallized in the crystallization step (S30) does not need to be crushed separately to adjust its size.

In the crystallization step (S30), crystallization of the salt proceeds due to the evaporation of water and the combination of chlorine ion and sodium ion in a state in which the function is uniformly spread on the salt crystal plate having uniform temperature and hydrophilicity, It takes about several minutes. Therefore, the crystallization step (S30) can crystallize the salt in a short time to increase the production amount of salt. In addition, the crystallization step (S30) can supply the energy required for the crystallization of the salt by uniformly irradiating sunlight to a salt crystal plate such as a conveyance belt, a cylindrical rotary plate, or a continuous rotation type circular plate passing through a cover made of a transparent material.

The moisture drying step (S40) is a step of drying and removing moisture contained in the crystallized salt. The crystallized salt may contain condensed water contained therein or surface water present on the surface. The salt is heated to a drying temperature of 80 to 150 DEG C to remove moisture, and is heated to a temperature lower than the crystallization temperature of the crystallization step (S30). The salt may be heated using a far-infrared lamp, a far-infrared ceramic heater, or heated air heated to a predetermined temperature. In addition, in the moisture drying step (S40), the gaseous components contained in the salt may also be removed together.

In addition, the moisture drying step (S40) can remove the moisture of the salt by irradiating sunlight with light. Particularly, when the sunlight is condensed and irradiated to the salt, moisture of the salt can be removed more efficiently. Also, in the case of drying the salt using sunlight, the water drying step (S40) may have the same effect as that of producing the salt in the conventional salt trough.

On the other hand, when the salt is not sufficiently removed in the crystallization step (S30) and the drying step (S40), an additional drying step using a separate roller kiln can be performed.

The foreign substance removing step (S50) is a step of finally selecting and removing the foreign substances contained in the crystallized salt. The salt may be a foreign substance which is not sufficiently removed even if it is produced by using the purified function, and foreign substances may be introduced during the production process. Accordingly, the foreign substance removing step (S50) selectively removes foreign substances contained in the salt. The foreign matter removing step may be performed using a white sorter and a visual inspection. Since the salt is white or translucent, foreign matter can easily be distinguished when passing through a white sorter.

The ultraviolet sterilization step S60 is a step of sterilizing the salt-removed salt by irradiating ultraviolet rays. The salt is prepared using a sterilized function by ozone treatment, but may include bacteria that have not been sterilized or bacteria that have been introduced during the process. Therefore, the salt is irradiated with ultraviolet rays to remove the bacteria.

The salt collection step (S70) is a step of collecting the finished salt after sterilization. The salt is collected in a separate container. At this time, the salt can be sorted by size using a vibrating screen or a sieve having holes of a predetermined size.

According to the natural salt production method using seawater, a function having seawater or a certain salinity concentration can be mass-produced by spraying and heating a salt crystal plate rotating or moving at a high speed to produce crystallized salt in a short time. In addition, since the natural salt production method using the seawater has a purification and sterilization step, it is possible to produce a salt which is hygienic and of good quality. In addition, the natural salt production method using the seawater does not remove the mineral component at the purification stage It is possible to produce natural salt with good balance of minerals.

Hereinafter, an apparatus for producing a natural salt for a natural salt production method using seawater according to an embodiment of the present invention will be described.

2 is a configuration diagram of an apparatus for producing natural salt using seawater according to an embodiment of the present invention. 3 is a specific configuration diagram of the integer module of FIG. FIG. 4 is a configuration diagram of a transfer heating module in which the transfer module and the heating module shown in FIG. 2 are formed integrally. FIG. 5 is a configuration diagram of a transfer heating module according to another embodiment corresponding to FIG. 4;

2 and 3, the natural salt production apparatus includes a water purification and sterilization module 110, a spray module 120, a transfer module 130, a heating module 140, a moisture drying module 150, Removal module 160 and an ultraviolet sterilization module 170. As shown in FIG. The natural salt production apparatus is an embodiment for realizing the natural salt production method using seawater according to an embodiment of the present invention and may be formed in various configurations including various heating modules for implementing the crystallization step.

The water purification and sterilization module 110 may include a precipitation tank 111, a filtration tank 113, and an ozone supply nozzle 115. In addition, the water purification and sterilization module 110 may include a screen filter 112, a filtration layer 114, and a hollow fiber filter 116. The water and ozone sterilizing module 110 purifies a function produced by evaporating and concentrating seawater from a salt evaporation paper producing conventional sun salt by filtration, precipitation and filtering, Sterilize or deodorize. The water purification and ozone sterilization module 110 may be formed in various structures. The sedimentation tank 111 and the filtration tank 113 may be integrally formed.

The sedimentation tank 111 has a screen filter 112 therein and filters and temporarily stores the function to remove impurities contained in the function. The calcium carbonate is precipitated by precipitating calcium carbonate contained in the function and precipitating and removing the insoluble and quartz having a high specific gravity. The fine floating mineral is collected and removed. The function passed through the function inlet pipe provided on the sedimentation tank is sent to the filtration tank 113. The filtration tank 113 is provided with a filtration layer 114 formed of sand and activated carbon. The filtration tank 113 further filters the impurities to remove impurities having a size of 0.1 to 1 mm. The average diameter of the sand is about 0.5 to 2.0 mm. The hollow fiber membrane filter 116 may be located on the upper or lower portion of the filtration layer in the filtration tank 113 or may be formed between the precipitation tank 111 and the filtration tank 113. The hollow fiber membrane filter 116 passes the beneficial minerals to the human body and removes harmful components such as fine impurities, heavy metals, and bacteria. The ozone injection nozzle 115 is inserted into the settling tank 111 or the filtration tank 113 and sterilizes the function by supplying ozone to a function contained therein. Meanwhile, the ozone spray nozzle 115 may be coupled to a separate sterilization tank (not shown). The sterilization tank may be connected to the filtration tank 113 to store the filtered function.

The injection module 120 includes an injection pipe 121 and an injection nozzle 123. The injection module 120 may further include a jetting housing 125. The injection module 120 injects a function supplied from the water purification and ozone sterilization module 110 through the injection nozzle 121 through the injection nozzle 121. The injection nozzle 123 may be formed of a general nozzle used for spraying water, and is formed of a corrosion-resistant material. The injection nozzle 123 may have various structures capable of controlling spraying or spraying size and amount of the sprayed function. The injection housing 125 may be formed to fix the injection nozzle 123, prevent the function from scattering, and to fix the injection nozzle 123 to the upper part.

The transfer module 130 may include a transfer shaft 131 and a transfer belt 133 including a salt crystal plate that forms a crystal of salt. The transfer module 130 is formed to extend in one direction from the lower part of the injection module 120. The transfer module 130 transfers a function of injecting the toner onto the upper surface of the conveyance belt 133, which is rotated by the rotation of the conveyance shaft 131 formed on both sides of the conveyance module 130. Here, the conveyance belt 133 functions as a salt crystal plate in which a function to be injected is crystallized. The conveyance belt 133 is heated to a crystallization temperature of 80 to 200 캜 which is a crystallization temperature of the salt. The conveying module 130 may be formed as a general conveyor system. However, the transfer module 130 is formed of a corrosion-resistant material as a whole because the transfer module 130 is a module in which a function of concentration of saline is injected. The conveyance belt 133 may be formed of a ceramic coated material having a surface structure that facilitates crystallization and peeling, and may be formed of a metal material such as stainless steel to prevent further contamination of the salt. . The conveying module 130 is formed by blocking or sealing the conveying belt 133 so that the function of the conveying belt 133 does not flow out to both sides or the lower part of the conveying belt 133.

In addition, the transfer module 130 may further include a preheating means 134 for heating the function to be injected. That is, the conveyance belt 133 is heated by the separate preheating means 134. The conveying belt 133 is heated by the rotation of the conveying shaft 131 while being preheated to a predetermined temperature so that the moisture of the function is partially evaporated first. When the conveyance belt 133 is heated, it is preferably made of a metal material having good thermal conductivity such as stainless steel.

The conveying module 130 may further include a conveying plate 135 that is mounted on the upper surface of the conveying belt 133 and is conveyed. The transfer plate 135 is transferred while being placed on the upper surface of the conveyance belt 133 so that a function is sprayed on the surface. The transfer plate 135 may be formed of a metal material such as stainless steel, a ceramic tile, or a ceramic plate to prevent further contamination of the salt. Further, a ceramic coating layer may be further formed on the surface of the transfer plate 135. The transfer plate 135 may be heated by a separate preliminary heating means 136 installed therein. Accordingly, the function of spraying onto the upper surface of the transfer plate 135 is such that the moisture is partially evaporated first.

The heating module 140 includes a heating housing 141 and a heating unit 143. The heating module 140 may further include hot air blowing means (not shown). The heating module 140 is located on the rear side of the injection module 120 and heats the function of being injected and delivered from the injection nozzle 123 to crystallize. In addition, the heating module 140 can supply hot air blowing air to the hot air blowing means to crystallize it more quickly.

The heating housing 141 is formed in a box shape so that the conveyance belt 133 or the heating plate 135 to be conveyed is transferred from the lower portion to the inside portion. Accordingly, the heating housing 141 blocks the sprayed function from the outside.

The heating means 143 is located inside the heating housing 141 and is heated to a temperature of 80 to 200 ° C to crystallize the salt into a salt. The heating means 143 is formed of a heating element such as a heating wire. Further, the heating means 143 may be formed by means for supplying hot air from the outside. In addition, the heating means 143 may further include a means for irradiating ultraviolet rays of the sun through a separate solar irradiation facility.

The moisture drying module 150 is formed with a drying housing 151 and drying means 153. The moisture drying module 150 dries and removes moisture contained in the crystallized salt (a).

The drying housing 151 is formed in a hollow box shape so that the conveyance belt 133 or the heating plate 135 to be conveyed is conveyed from the lower side or the inside side. The drying housing 151 allows the crystallized salt (a) to be blocked from the outside.

The drying means 153 is located inside the drying housing 151 and heats the crystallized salt a at a drying temperature of 80 to 150 ° C to remove water contained in the salt a and dry it. The drying means 153 may be formed by a heating means such as a far infrared ray lamp or a far infrared ray ceramic heater. That is, the drying unit 153 irradiates the far infrared ray to the crystallized salt (a), and the salt (a) is heated to the drying temperature and dried. The drying means 153 may be hot air heated to a drying temperature supplied from the outside.

On the other hand, the dry-type drying module 150 may be formed as a means for collecting and irradiating sunlight. In this case, the moisture drying module 150 may further include a solar room inlet means for extending outdoors to allow solar light to be collected, or for introducing sunlight outside the building into the interior of the building . The moisture drying module 150 uses a drying means 153 as an auxiliary heating means and a transparent window for passing sunlight through the drying housing 151 is formed. Further, the moisture drying module 150 is further provided with means for collecting solar light, though not specifically shown.

The foreign matter removing module 160 includes a sorting device such as a white sorting device. The foreign substance removing module 160 removes minute foreign substances generated during the production of salt.

The sterilizing module 170 is formed with an ultraviolet irradiation unit 171. The sterilization module is located on the rear side of the foreign substance removal module. The sterilization module 170 irradiates the crystallized salt (a) with ultraviolet rays to sterilize the microbial bacteria at the final stage of the production process.

Referring to FIG. 4, the natural salt production apparatus may include a transfer module 230 and a transfer module 230, which are integrally formed with the transfer module and the heating module. The transfer heating module 230 may include a rotary shaft 231, a cylindrical rotary plate 233, a heating unit 235, and a transfer guide plate 237. The cylindrical rotating plate 233 is rotated by the rotating shaft 231 and heated to the crystallization temperature by the heating means 235. The cylindrical rotating plate 233 heats the function of spraying by the spray nozzle 123 on the outer circumferential surface to evaporate moisture and crystallize the salt a. Therefore, the cylindrical rotary plate 233 functions as a salt crystal plate in which the sprayed function is crystallized into a salt. The cylindrical rotating plate 233 is heated to a crystallization temperature of 80 to 200 ° C which is a crystallization temperature of the salt. The transfer guide plate 237 transfers the salt (a) crystallized on the outer peripheral surface of the cylindrical rotating plate 233 to the moisture drying module 150. The conveying guide plate 237 may be formed of a conveyor belt. In this case, the moisture drying module 150 may be formed on the outer circumferential portion of the cylindrical rotating plate 233 or on the transport guide plate 237 at a position apart from the position where the function is sprayed.

5, the transfer heating module 330 may include a circular plate 331, a separation plate 333, heating means (not shown), and a transfer guide plate 335. The circular plate 331 is rotated by a rotating shaft (not shown) located at a lower portion thereof and is heated to a crystallization temperature by a heating means (not shown) located below. The circular plate 331 heats the function of the upper surface sprayed by the spray nozzle 123 to crystallize it into salt a. Therefore, the circular plate 331 functions as a salt crystal plate in which a function to be injected is crystallized. The circular plate 133 is heated to a crystallization temperature of 80 to 200 ° C which is a crystallization temperature of the salt. The separation plate 333 prevents the function of the injection nozzle 123 and the crystallized salt from mixing. The transfer guide plate 335 separates the crystallized salt from the outside of the rotary plate 231 and transfers it to the moisture drying module 150. In this case, the moisture drying module 150 may be formed on the upper portion of the circular plate 331 at a position spaced apart from the position where the function is injected, or may be formed on the upper portion of the transfer guide plate 335.

110: integer module 120: injection module
130: feed module 140: heating module
150: moisture drying module 160: foreign matter removing module
170: sterilization module
230, 330: Feed Heating Module

Claims (6)

An integer step of filtering the function to remove impurities contained in the function, and
And crystallizing the salt by spraying, spraying and heating the above-mentioned function. The method according to claim 1,
After this purification step
The ozone sterilizing step for sterilizing ozone by supplying the ozone to the function proceeds,
After the crystallization step
A moisture drying step of drying and removing moisture of the crystallized salt, and
A foreign matter removing step for removing foreign matters from the crystallized salt is performed,
After the foreign matter removal step
Wherein the ultraviolet sterilization step of sterilizing the salt by irradiating ultraviolet rays is performed. The method according to claim 1,
The integer steps
A first filtering step of filtering the function using a screen filter,
A sedimentation step of storing the filtered function in a sedimentation tank for a predetermined period of time to sediment and remove non-spoiled impurities, and floating and coagulating the spoiled impurities;
A filtration step of passing the above function through a filtration layer formed of sand and activated carbon to remove impurities, and
And a second filtering step of filtering the function by using a hollow fiber membrane filter. The method according to claim 1,
Wherein the crystallization step includes a function injection step of injecting the function onto the salt crystal plate and a function crystallization step of crystallizing the function,
Wherein the functional injection step and the hydrate crystallization step are carried out sequentially or simultaneously. 5. The method of claim 4,
The functional crystallization process is performed by heating the above-mentioned function at a crystallization temperature of 80 to 200 ° C,
Wherein the process is performed by spraying the above function onto a heating plate heated to the crystallization temperature or by heating to the crystallization temperature after spraying the above function. 3. The method of claim 2,
In the water drying step, the salt is heated to a drying temperature of 80 to 150 ° C to dry the water contained in the salt,
Wherein the salt is heated by a far-infrared lamp, a far-infrared ceramic heater, a hot wind or a condensed sunlight.

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