WO2013039360A2

WO2013039360A2 - Ionized calcium aqueous solution and a production method therefor

Info

Publication number: WO2013039360A2
Application number: PCT/KR2012/007406
Authority: WO
Inventors: 김미영
Original assignee: 주식회사 시로미
Priority date: 2011-09-16
Filing date: 2012-09-17
Publication date: 2013-03-21
Also published as: KR20130030015A; KR101347276B1; WO2013039360A3

Abstract

The present invention relates to an ionized calcium aqueous solution and to a production method therefor. More specifically, the invention relates to: an ionized calcium aqueous solution which has the effects of maximising the absorption of calcium into the bodies of livestock and promoting metabolism and vital functions in livestock; and to a production method therefor. The production method for the ionized calcium aqueous solution constituting the present invention provides a high-purity stable alkaline ionized calcium aqueous solution which achieves a high concentration with a pure calcium content of between 94 and 97% and in which the hydrogen ion concentration is from pH 12 to 13, thereby having the effect of increasing absorption and consequently maximising calcium efficacy when used in food additives, calcium ion drinks, animal feed, farmed fish feed, agricultural ionized calcium and the like. In addition, when the ionized calcium aqueous solution constituting another facet of the present invention is fed to livestock as an additive in feed, it has the effect of increasing the storage period by suppressing denaturing and microbial growth in the livestock feed, and minimising consequent loss of nutrients, and increasing the bodily absorption of calcium.

Description

Calcium ionized solution and preparation method thereof

The present invention relates to an aqueous calcium ion solution and a method for manufacturing the same, and more particularly, to an aqueous calcium ion solution and a method for producing the same, which maximize the absorption of calcium into the body of animals and promote metabolism and biological function of the animals. It is about.

In order to increase the intracellular absorption of calcium, calcium must be ionized to be water soluble. Calcium ions (Ca 2+) derived from calcium carbonate contained in limestone, etc., require a long time to naturally exist in the groundwater, and limestone itself is hard rock and does not easily dissolve in water.

In order to overcome this point, there is a manufacturing technology of artificial porous ceramic sintered body of clay mineral using elvan, illite and limestone for elution of calcium ions, but there is a problem in that reliability is lowered during commercialization.

In addition, when lime calcium containing a large amount of ash is accumulated as a soil improver by the simple firing of shellfish, the calcium calcification in the soil may be accelerated, and the lime calcium is used as a feed supplement, but there is a limit of insolubility.

As a method of ultra high temperature calcination to overcome this point, there is a manufacturing technique of calcium ion having a hydrogen ion concentration (pH) that can be applied to humans or animals after removing impurities by high temperature calcination of carbon and coke together with shells. . At this time, even if technically reasonable conditions of firing, it is difficult to overcome the variation in the pH and calcium content of the product according to the conditions of the given material. Therefore, there was a problem in that the reliability of the content and specification of the ingredients in the process of commercialization.

The present invention has been made to overcome the problems and limitations as described above,

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for preparing an aqueous calcium ion solution to stabilize the content and specification of calcium ion and to thereby maintain an appropriate level of trace elements, and to maintain an appropriate pH.

In addition, another object of the present invention is to increase the shelf life by inhibiting the alteration and bacterial generation of livestock feed, thereby minimizing the loss of nutrients, ionization that can be used as a livestock feed that can increase the body absorption rate of calcium It is to provide an aqueous solution of calcium.

In order to achieve the above object, the present invention provides the following specific problem solving means.

Method for producing an aqueous calcium ion solution according to the present invention, washing step of removing foreign matter and impurities through the washing of shells; A high temperature firing step of heating and calcining the dried shellfish to produce calcium oxide by removing organic substances and residual toxicity contained in the dried shellfish; Grinding the calcium oxide to produce a calcium oxide powder; A stirring step of preparing a calcium oxide solution by mixing and stirring the calcium oxide powder and water; Supplying saturated steam to the container containing the calcium oxide solution, inducing an ionic reaction by generating static electricity in the container to produce an ionized calcium solution; And a hydrogen ion concentration adjusting step of adding the soft water treated water or pure water to the ionized calcium aqueous solution to maintain the hydrogen ion concentration at pH 12-13.

At this time, in the high temperature firing step, it is preferable to heat and fire shellfish dried for 1 to 3 hours at a temperature of 1100 ~ 2000 ℃. This is the temperature and time necessary to allow the dried shellfish to be completely fired, and thus the temperature and time can be adjusted according to the application. At this time, in order to promote complete calcining and calciumation of the shellfish, it is preferable to gradually raise the temperature from 1100 ° C to the final temperature of 2000 ° C over 1 to 3 hours to heat and calcine the dried shellfish.

Furthermore, when it is intended to be used as a livestock feed additive for constant temperature animals such as mammals or birds, it is preferable to heat and calcined dried shellfish for 2 to 3 hours in the range of 1100 to 1600 ° C. Of course, even in this case, it is preferable that the firing temperature is gradually increased gradually over 2 to 3 hours from the initial temperature of 1100 ° C to the final temperature of 1600 ° C. This is because when the calcium ionized aqueous solution is used as an additive for livestock animals for constant temperature animals, the effect can be seen even if the particles are somewhat large or the ionization degree is lower, and the sensitivity to the components is less than that of the fish.

On the other hand, the particle size of the calcium oxide powder pulverized in the crushing step is preferably 20㎛ or less, the particle size can be adjusted depending on whether the aqueous solution of calcium ionization is used. For example, when added to aquaculture feed, it is desirable to limit the particle size of the calcium oxide powder to 10 μm or less in consideration of the sensitivity of the fish, which is a transgenic animal, but for feed additives of livestock such as mammals or birds, which are relatively less sensitive. This is because even if the particle size of the calcium oxide powder is set to 20㎛, it is not too much.

In the stirring step, it is preferable to mix and stir the calcium oxide powder at a ratio of 0.1 to 2 parts by weight with respect to 100 parts by weight of water, because the calcium oxide powder is best ionized in water when mixing and stirring at this weight ratio. In addition, the stirring time in the stirring step is preferably stirred for 2 to 5 hours after mixing, when used as an additive for livestock feed for constant temperature animals such as mammals and birds, it is preferable to stir for 2 to 4 hours, and relatively When the particle size is small, it is preferable to stir for 3 to 5 hours because the degree of ionization should be increased by dispersing it evenly in water.

In addition, the pressure of the saturated steam supplied in the ion reaction step is preferably 1.4 ~ 5MPa.

In addition, the method for producing an aqueous calcium ion solution according to the present invention, the ion reaction step of each step constituting the calcium oxide solution injection step of injecting the calcium oxide solution into the container; An electrostatic generating step of generating static electricity by water droplets generated while supplying saturated steam having a temperature of about 300 ° C. or less and a pressure of 1.4 to 5 MPa to the vessel; An ion reaction inducing step of inducing an ionic reaction by stirring the inside of the container while maintaining a constant pressure inside the container; A first saturated steam discharge step of discharging saturated steam in the container to a first pressure reducing tank to balance pressure between the inside of the container and the inside of the first pressure reducing tank; A second saturated steam discharging step of discharging saturated steam in the container to a second pressure reducing tank having a volume larger than that of the first pressure reducing tank after closing the first pressure reducing tank; And an ionizing calcium aqueous solution obtaining step of obtaining the aqueous calcium ionization solution in the first and second decompression tanks.

On the other hand, the aqueous solution of calcium ion which is another aspect of the present invention is characterized in that it is produced by the above production method.

According to the present invention, the method for preparing an aqueous calcium ion solution reaches a high concentration such that the content of pure calcium reaches 94 to 97%, and provides a high purity stable alkaline ionized calcium aqueous solution having a hydrogen ion concentration of pH 12 to 13, thereby adding food additives and calcium. When applied to ionic beverages, animal feeds, farmed fish feeds, agricultural ionized calcium, etc., the absorption rate in the body is high when used, thereby maximizing the effect of calcium.

In addition, the ionized calcium aqueous solution according to the present invention increases the shelf life by inhibiting the alteration and bacterial generation of animal feed when used in animal feed, minimizes the loss of nutrients, and increases the body absorption rate of calcium by absorbing calcium It is effective in reducing intestinal gas generated by deficiency, ascites caused by calcium metabolic disorder, lowering immunity due to calcium deficiency, and lowering skin mucus.

1 is a process chart showing a manufacturing process of an aqueous calcium ion solution according to an embodiment of the present invention.

Figure 2 shows a graph showing the results for the growth experiments of the flounder fed with the feed added as an additive to the halibut calcium aqueous solution prepared in accordance with an embodiment of the flounder and the flounder fed with the general feed.

Figure 3 is the blood of the halibut fed the feed with the addition of the aqueous solution of ionized calcium prepared according to an embodiment of the present invention as a feed additive and the blood of the halibut fed the normal feed to measure the aspartic acid amino-transferase (AST) The graph shows the results.

Figure 4 is a graph showing the results of measuring the glucose (Glucose) by collecting the blood of the olive flounder fed the feed and the general feed fed with the calcium ionized aqueous solution prepared according to an embodiment of the present invention as a feed additive .

Figure 5 shows the results of measuring the lysozyme activity by collecting the slime and the slime of the halibut fed the feed with the feed added to the ionized calcium aqueous solution prepared according to an embodiment of the present invention as a feed additive It is a graph.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1. Cleaning step (S100)

In the washing step, foreign substances and impurities are removed by washing shellfish and dried. Shell (Shell, 貝殼) refers to the inorganic secretion formation to protect the molluscs in mollusks, where shells may be used such as oyster shells, shell shells.

2. High temperature firing step (S200)

Subsequently, the dried shellfish is heated and calcined in the high temperature baking step to remove organic matter and residual toxicity contained in the dried shellfish, thereby preparing calcium oxide.

In this case, calcium oxide may be prepared by heating and firing the dried shellfish at 1100 ° C. to 2000 ° C. for 1 to 3 hours. In this case, calcium oxide may be prepared by heating and firing the dried shellfish at an initial temperature of 1100 ° C. and gradually raising the temperature to a final temperature of 2000 ° C.

In the high temperature firing step, calcium carbonate (CaCO ₃ ), which is a constituent of shellfish, is calcined and converted to calcium oxide (CaO) in solid state.

3. Grinding step (S300)

Calcium oxide powder is prepared by grinding the calcium oxide prepared in the high temperature firing step. At this time, it is preferable to grind using a wet ball mill.

At this time, the particle diameter of the pulverized calcium oxide powder may be 20㎛ or less. If the particle size of the calcium oxide powder exceeds 20㎛ is because there is a problem that is not well mixed when preparing a calcium oxide solution by mixing with water. On the other hand, in order to obtain an ionized calcium solution used as a fish feed additive, it is preferable to grind to have a particle diameter of 10㎛ or less, because the calcium oxide powder of 10㎛ or less size is better mixed with water.

4. Stirring step (S400)

In the stirring step, the calcium oxide powder and water are mixed and stirred to prepare a calcium oxide solution. The calcium oxide solution prepared here is strongly alkaline.

At this time, the mixed weight ratio of water and calcium oxide powder is preferably 0.1 to 2 parts by weight of calcium oxide powder based on 100 parts by weight of water. Because if the weight ratio of calcium oxide powder to 100 parts by weight of water exceeds 2 parts by weight may not be sufficiently mixed in water, if less than 0.1 parts by weight prepared aqueous solution of calcium ion may not supply enough calcium in the body Because. Therefore, when the weight ratio is maintained, the calcium oxide powder is well mixed with water, and when used as a feed additive as an aqueous solution of calcium ion, it exhibits the effect of supplying sufficient calcium in the body.

Meanwhile, the calcium oxide solution may be prepared by mixing the calcium oxide powder and water, followed by stirring for 2 to 5 hours. At this time, the calcium oxide powder is evenly mixed with water by stirring for 2 to 5 hours. On the other hand, when preparing an aqueous calcium ion solution used as additives for fish feed it is good to stir for about 3 to 5 hours to finely disperse the fine calcium oxide powder mixed in water well.

5. Ion reaction step (S500)

Saturated steam is supplied to a vessel containing the calcium oxide solution prepared in the stirring step (S400) to generate an electrostatic reaction in the vessel to prepare an ionized calcium aqueous solution.

First of all, saturated steam generated in a boiler generates some condensation due to the temperature drop in the vessel, which results in the formation of droplets. The generated droplets collide or rub against each other, thereby generating static electricity. In addition, the supplied air is expelled by the supplied saturated steam, and saturated steam also penetrates into the calcium oxide solution. The static electricity accumulated in the droplets reaches the container either directly or through calcium oxide solution.

The portion where the static electricity flows in the calcium oxide solution is locally heated to rise in temperature and ion structure, but the current is not continuously flowing and the amount of power is small, so the temperature rise is small. In addition, since the average temperature in the container does not rise above the temperature of the saturated steam supplied, harmful components hardly occur.

In addition, since saturated steam is filled in the container, even if sparks are generated by the flow of static electricity, it is prevented from being flammed by flammable gas or the like.

Thus, by using the heat, pressure and static electricity of saturated steam, a stable water-soluble ionization calciumation action occurs.

Meanwhile, since the vessel and the stirring means are made of a chargeable material, ionization may be promoted according to the following mechanism. When the vessel and the stirring means are charged and provided in an insulated state with respect to the base, the calcium oxide solution, the vessel and the stirring means have positive or negative charges (electrostatic) due to friction with the calcium oxide solution. Accumulates. On the other hand, the saturated steam heated and pressurized is supplied in the container, and since this saturated vapor penetrates into the inside of the calcium oxide solution, the electrical resistance inside the calcium oxide solution decreases, so that electricity easily flows.

Here, the charging property means that the electrical resistance is large and that the added calcium oxide solution can be positively or negatively charged. The charging may be performed either positively or negatively.

For example, when a certain amount of negative charge is accumulated in the calcium oxide solution when positive charge is accumulated in the vessel and the stirring means, the charge flows through the inside of the calcium oxide solution and into the vessel and the stirring means. Since the calcium oxide solution is agitated, the amount of charge collection varies with each part, and the path and time through which the charge flows also differ. In addition, since saturated steam is filled in the container, the electrical resistance is not too high or the static electricity is not collected too much. Therefore, the static electricity is discharged little by little, and instantaneously generates heat in the discharge path during discharge, while the calcium oxide solution is converted into a stable aqueous solution of calcium ionization. However, since discharge is not carried out continuously, it does not become a high temperature, the entire temperature in the container does not increase significantly at the set temperature by heating steam, and water suppresses the generation of harmful components.

In this case, the pressure of the saturated steam supplied to the container including the calcium oxide aqueous solution may be 1.4 to 5 MPa.

On the other hand, the ion reaction step (S500) is a calcium oxide solution injection step (S510) specifically injecting the calcium oxide solution into the container; An electrostatic generating step (S520) in which static electricity is generated by water droplets generated while supplying saturated steam having a temperature of about 300 ° C. or less and a pressure of 1.4 to 5 MPa to the vessel; An ion reaction inducing step (S530) of inducing an ionic reaction by stirring the inside of the container while maintaining a constant pressure in the container; A first saturated steam discharge step (S540) of discharging saturated steam in the container to a first pressure reducing tank to achieve a pressure balance between the inside of the container and the first pressure reducing tank; A second saturated steam discharge step (S550) of discharging saturated steam in the container to a second pressure reducing tank having a volume larger than that of the first pressure reducing tank after closing the first pressure reducing tank; And an aqueous calcium ion solution acquisition step (S560) of obtaining the aqueous calcium ionization solution from the first pressure reducing tank and the second pressure reducing tank.

6. Hydrogen ion concentration adjusting step (S600)

Hydrogen ion concentration is maintained at pH 12-13 by adding soft water or pure water to the calcium ionized solution.

Herein, soft water treated water refers to water whose hardness is adjusted to less than 0 to 60 mg / L, and pure water treated water refers to water from which impurities including hardness components are removed.

On the other hand, the aqueous solution of calcium ion prepared according to the embodiment of the present invention can be used as additives of fish feed, additives of livestock feed, calcium ionized drinks and calcium fortification of plants, but is not limited thereto.

In the case of using as a feed additive for fish, such as a flatfish, such as flounder, the dried shellfish was gradually heated up to 1300 to 2000 ° C. so that the total heating and calcining time was 2 to 3 hours. In addition, the calcium oxide produced in the high temperature firing step was pulverized with a wet ball mill to have a particle size of 8㎛, and then mixed with water and stirred. At this time, the water and calcium oxide powder was mixed in a ratio of 1 weight ratio of calcium oxide powder to 100 parts by weight of water and then stirred for 5 hours to prepare a calcium oxide solution. Saturated steam with a pressure of 4 MPa was supplied to the vessel containing the prepared calcium oxide solution to induce an ionic reaction to prepare a calcium ionized aqueous solution. The prepared was added to the feed for the flounder and then fed to the flounder. In case of fry, 10 times diluted with water is used, but it is preferable to use it without diluting as it becomes adult.

On the other hand, when the calcium ionized aqueous solution was used as an additive to the olive flounder for the entire period, it was used by adding 1 g of calcium ionized aqueous solution to 1 kg of olive flounder.

Table 1 below shows the hydrogen ion concentration according to the content ratio of the calcium oxide powder of the aqueous solution of calcium ionized according to Example 1 of the present invention.

Table 1

Calcium ionized solution (g / 10mL)	pH measurement
0.01	12.340
0.02	12.387
0.03	12.394
0.04	12.411
0.05	12.412

As the calcium oxide powder dissolved in 10 ml of water increases from 0.01 g to 0.05 g, the pH value gradually increases from 12.340 to 12.412. The calcium oxide powder becomes more alkaline as it is dissolved in water.

Table 2 below shows the results of disinfection, pH change and dissolution rate of the calcium ionized aqueous solution prepared according to Example 1 of the present invention.

TABLE 2

Distilled water	Measuring time	OD value (600)	pH	Presence of sediment
40 ml	Early	0.005	12.785	U
40 ml	After 1hr	0.010	12.592	radish
50 ml	Early	0.005	12.662	U
50 ml	After 1hr	0.010	12.512	radish

O.D. when the amount of distilled water is 40 or 50 ml. The value increases from 0.005 to 0.010 after 1 hour and the precipitate disappears after 1 hour.

Figure 2 is a graph showing the results for the growth experiments of the flounder (experimental group) and the flounder (control group) fed the feed supplemented with the additives to the flounder feed prepared by the aqueous solution of ionized calcium prepared according to Example 1 of the present invention It is shown.

The experimental group had an average body weight of 154 g and a control group of 144 g on May 14, the early stage of the experiment. As a result of the two-month comparison experiment, the final mean weight of the experimental group on July 13 was 283g and the control group was 254g. Initially, there was a difference of about 10g, but after two months of feeding different feeds, there was a weight difference of about 30g.

Table 3 below shows the mean weight, survival rate and weight gain rate of the experimental and control groups.

TABLE 3

division	Experimental group	Control
Early breeding failure	6,209	6,232
Final breeding failure	5,419	5,420
Initial average weight (g)	154	144
Final average weight (g)	283	254
Survival rate (%)	87.3	86.6
% Weight gain	83.8	76.4

Period: 2011.5.14 ~ 7.14

The survival rate of the experimental group was 87.3%, higher than the 86.6% of the control group, the weight gain rate was 83.8% in the experimental group, 76.4% in the control group and the ion calcium aqueous solution prepared according to the embodiment of the present invention was used as a feed additive. It can be seen that the efficacy of.

FIG. 3 shows the blood of the flounder (experimental group) fed with the feed added with the aqueous calcium ionized solution prepared according to Example 1 as a feed additive and the blood of the flounder (control group) fed with the general feed, and aspartate amino group transfer. The graph shows the result of measuring enzyme (AST).

In the experimental group, the AST value was about 9U / L, whereas in the control group, the amount of aspartic acid aminotransferase was high in the experimental group.

4 is a blood glucose of the olive flounder (experimental group) fed with the feed added to the ionized calcium aqueous solution prepared according to Example 1 as a feed additive and the blood of the flounder (control) fed the normal feed glucose (Glucose) This graph shows the result of the measurement.

In the experimental group was about 60mg / dL, while the control group was measured to be less than 50mg / dL, the amount of glucose was high in the experimental group.

Figure 5 is a lysozyme (Lysozyme) by collecting the slime of the flounder (experimental group) and the halibut (control group) fed the feed with the feed added the calcium ionized aqueous solution prepared according to Example 1 of the present invention as a feed additive This graph shows the result of measuring activity.

The experimental group was about 0.009 unit / mL, whereas the control group was measured at about 0.008 unit / mL, so the lysozyme activity was high in the experimental group.

The aqueous calcium ion solution prepared according to Example 1 of the present invention is easily absorbed into the cell body without the aid of an absorption promoter such as vitamin D3, thereby maximizing the efficacy of the calcium ion when absorbed into the cell body.

In other words, it is possible to directly ingest and absorb, and to add a predetermined amount to fish and livestock feed as a main ingredient or auxiliary material, so that the water-soluble ionized calcium contained in the feed inhibits the deterioration of the feed and the generation of bacteria to increase the shelf life. . This minimizes the loss of nutrients and adds water-soluble ionized calcium to make calcium ionization easier to eat, and increases the body's absorption of calcium to make up for the lack of calcium in the feed, thereby increasing the metabolism of fish and plants and animals. Promotes biological function

In particular, it prevents immunity as well as growth by preventing intestinal gas generation caused by lack of calcium absorption of fish, which is caused by deficiency of calcium metabolism, multiple occurrences of fish due to calcium metabolism disorders, immunity deterioration due to calcium deficiency, and deterioration of skin mucus due to lack of calcium. Increasing the survival rate can increase the profitability and competitiveness of the aquaculture industry.

On the other hand, the embodiments of the present invention disclosed in the specification and drawings are merely presented specific examples to aid understanding, and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention can be carried out in addition to the embodiments disclosed herein.

The present invention reaches a high concentration of pure calcium content of 94-97%, and provides a high purity stable alkaline ionized calcium aqueous solution in which hydrogen ion concentration is pH 12-13, food additives, calcium ion drink, animal feed, aquaculture It can be applied to fish feed, agricultural calcium ion, etc.

Claims

A washing step of removing foreign matters and impurities by washing shellfish and then drying them;

A high temperature firing step of heating and calcining the dried shellfish to produce calcium oxide by removing organic substances and residual toxicity contained in the dried shellfish;

Grinding the calcium oxide to produce a calcium oxide powder;

A stirring step of preparing a calcium oxide solution by mixing and stirring the calcium oxide powder and water;

Supplying saturated steam to the container containing the calcium oxide solution, inducing an ionic reaction by generating static electricity in the container to produce an ionized calcium solution; And

And a hydrogen ion concentration adjusting step of adding a softened water or purely treated water to the aqueous solution of calcium ion to maintain a hydrogen ion concentration of pH 12 to 13; and a method for producing an aqueous calcium ion solution.
The method of claim 1,

In the high temperature baking step,

Method for producing an aqueous calcium ion solution, characterized in that for heating at 1100 ~ 2000 ℃, dried shellfish for 1 to 3 hours and calcining.
The method of claim 2,

In the high temperature baking step,

A method for producing an aqueous calcium ion solution, comprising heating and calcining dried shellfish by gradually raising the temperature from an initial temperature of 1100 ° C to a final temperature of 2000 ° C.
The method of claim 1,

The particle size of the calcium oxide powder pulverized in the grinding step is a method for producing an aqueous calcium ion solution, characterized in that 20㎛ or less.
The method of claim 1,

In the stirring step, the calcium oxide powder is mixed and stirred at a ratio of 0.1 to 2 parts by weight with respect to 100 parts by weight of water.
The method of claim 5,

Method for producing an aqueous calcium ion solution, characterized in that for stirring for 2 to 5 hours after mixing water and calcium oxide powder in the stirring step.
The method of claim 1,

Pressure of saturated steam supplied in the ion reaction step is a method for producing an aqueous calcium ion solution, characterized in that 1.4 ~ 5MPa.
The method according to any one of claims 1 to 7,

The ion reaction step,

Calcium oxide solution injection step of injecting the calcium oxide solution into the container;

An electrostatic generating step of generating static electricity by water droplets generated while supplying saturated steam having a temperature of about 300 ° C. or less and a pressure of 1.4 to 5 MPa to the vessel;

An ion reaction inducing step of inducing an ionic reaction by stirring the inside of the container while maintaining a constant pressure in the container;

A first saturated steam discharge step of discharging the saturated steam in the container to a first pressure reducing tank to achieve a pressure balance between the inside of the container and the first pressure reducing tank;

A second saturated steam discharging step of discharging saturated steam in the container to a second pressure reducing tank having a volume larger than that of the first pressure reducing tank after closing the first pressure reducing tank; And

And a calcium ionized aqueous solution obtaining step of obtaining the aqueous calcium ionized solution in the first reduced pressure tank and the second reduced pressure tank.
An aqueous calcium ion solution prepared by the method of any one of claims 1 to 7.
Aqueous calcium ion solution prepared by the method of claim 8.