JP2007145628A - Vaterite type calcium carbonate having crossed disk-like, hamburger-like or disk-like shape and its manufacture method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide vaterite type calcium carbonate having a crossed disk-like, hamburger-like or disk-like shape, which hardly contains impurities and is usable in wide-ranging fields and in which the particle size of highly-dispersible particles is controlled, and to provide a method for manufacturing vaterite type calcium carbonate. <P>SOLUTION: Vaterite type calcium carbonate having the crossed disk-like, hamburger-like or disk-like shape, which has 1-20 μm disk-like standard particle size, is manufactured by preparing an aqueous solution containing water-soluble calcium salt of 0.1-1 mol/L concentration and another aqueous solution containing water-soluble carbonate of 0.1-1 mol/L concentration and reacting the water-soluble calcium salt with the water-soluble carbonate at 5-60°C reaction temperature by dripping the former solution in the latter solution or the latter solution in the former solution for 0.1-10 hours while accelerating/decelerating the rotational speed of an agitator. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a method for producing a vaterite-type calcium carbonate having a crossed disk shape, a hamburger shape, or a disk shape with disk-shaped calcium carbonate as basic particles. More specifically, the present invention relates to a vaterite-type calcium carbonate having a discoidal shape, a hamburger shape, or a disc shape, which is made of a discoidal calcium carbonate having a good dispersibility and having a controlled particle size and containing almost no impurities. The present invention relates to a method for efficiently producing in a short time and with a simple operation.

The carbon dioxide method is widely adopted as an industrial production method for calcium carbonate. The production process by this production method includes the calcination of limestone, the digestion and carbonation process, the foreign matter removal process, the cleaning of limestone calcined exhaust gas, and the petrified emulsion. The process of introduction into the system is necessary, and complicated processes and devices are necessary. Moreover, there is a problem of impurities mixed in from limestone, and its use is limited to industrial products or foods. In order to expand the use, it is necessary to go through a process for purifying lime milk that removes impurities from limestone, which complicates the process and apparatus for that purpose and has the disadvantage of increasing manufacturing costs.
On the other hand, the solution method has the advantage of eliminating impurities, simplifying the manufacturing apparatus, and reducing the manufacturing cost. However, the shape of calcium carbonate produced by the solution method that has been proposed so far is almost spherical and has limited applications.

As a method for producing calcium carbonate in the form of a plate, oval and petal,
There is a description of a method of carbonizing plate-like calcium hydroxide with carbon dioxide at a high temperature (“Gypsum and Lime” No. 196 (hereinafter referred to as Non-Patent Document 1)).
JP-A-61-219717 (hereinafter referred to as Patent Document 1) states that “a method of producing plate-like calcium carbonate by bringing a basic calcium carbonate in a plate-like form into contact with carbon dioxide gas at a temperature of 200 ° C. or higher. Is described.
In JP-A-11-314915 (hereinafter referred to as Patent Document 2), “a specific point in time during the carbonation reaction by introducing carbon dioxide into a methanol suspension containing a specific amount of quicklime and / or slaked lime and a specific amount of water” To adjust the temperature in the reaction system to a specific temperature, specify the time for the electrical conductivity in the reaction system to reach a specific value from the start of the carbonation reaction, and carry out the carbonation reaction. There is a description of "manufacturing method".
Patent No. 3362239 (hereinafter referred to as Patent Document 3) “Carbonating reaction is carried out in the presence of organic amine compound under the condition that carbon dioxide is introduced into lime milk to form a basic calcium carbonate in the form of a plate. Has proposed a method for synthesizing plate-like calcium carbonate.
Japanese Patent Application Laid-Open No. 1-108117 (hereinafter referred to as Patent Document 4) describes “a method of producing a vaterite spherical calcium carbonate by stirring and mixing a calcium ion solution and a carbonate ion solution”.
Patent No. 3376826 (hereinafter referred to as Patent Document 5) “Introduces carbon dioxide into lime milk coexisting with a condensed phosphate compound, and forms a new condensed phosphate compound under the basic calcium carbonate production conditions in the form of a plate. By repeatedly introducing carbon dioxide into the coexisting lime milk, and agglomerating the primary particles of basic calcium carbonate with a plate-like structure into spherical shapes, by contacting with carbon dioxide under heating, the carbonation is terminated Method for synthesizing porous spherical calcium carbonate "

Japanese Patent Laid-Open No. 61-219717 JP 11-314915 A Japanese Patent No. 3362239 Japanese Patent Laid-Open No. 1-108117 Japanese Patent No. 3376826 N. Yasue, Yoshiaki Tsuchida, Kenichi Tanaka, Yasuo Arai, Heat Carbonation of Hexagonal Plated Calcium Hydroxide and Properties of Carbonate, Gypsum and Lime, Japan, Gypsum Lime Society, 1986, No. 196,121

However, in Non-patent Document 1 and Patent Document 1, solid plate-like calcium calcium hydroxide or basic calcium carbonate is brought into contact with gaseous carbon dioxide to carbonate to produce calcium carbonate. It requires energy and further requires a long time for carbonation, resulting in high costs and not suitable for industrial production. Furthermore, the form of calcium carbonate to be generated is a plate shape, which is different from the crossed disk shape, the hamburger shape or the disk shape of the present invention.
The production method of Patent Document 2 is a method in which a large amount of alcohol is added to lime milk and carbonated with carbon dioxide gas. At the same time, equipment and cost are required to recover alcohol, and the cost increases. It is unsuitable for pharmacopoeia and food additive standards and is not suitable for industrial production. Furthermore, the form of calcium carbonate to be produced is spherical or elliptical spherical, and is different from the crossed disk shape, hamburger shape or disk shape of the present invention.
In the production method of Patent Document 3, carbonation is performed under basic calcium carbonate generation conditions when carbon dioxide gas is introduced into lime milk, and an amine compound is adsorbed on the surface of the generated calcium carbonate because an amine compound is added when basic calcium carbonate is generated. Therefore, it becomes unsuitable for Japanese Pharmacopoeia and food additive standards, and the range of use is limited. Furthermore, the form of calcium carbonate to be generated is a plate shape, which is different from the crossed disk shape, the hamburger shape or the disk shape of the present invention.
The production method of Patent Document 4 is a reaction of a soluble calcium salt and a soluble carbonate, but is a vaterite type crystal because of rapid mixing, but the particle form becomes spherical and the crossed disk shape, hamburger shape or disk shape of the present invention. Different from form.
In the production method of Patent Document 5, carbonic acid gas is introduced into lime milk coexisting with a condensed phosphate compound, and lime milk coexisting with a new condensed phosphate compound is produced under the basic calcium carbonate production conditions in the form of a plate. Addition and introduction of carbon dioxide gas are repeated twice or more to produce spherical aggregates of basic calcium carbonate particles having a plate-like structure, which are brought into contact with carbon dioxide gas under heating to perform carbonation. It is a method of synthesizing porous spherical calcium carbonate by finishing.
Because lime milk is used, it is unsuitable for the Japanese Pharmacopoeia due to impurities in lime milk derived from limestone, and the carbonation process of basic spherical calcium carbonate is a reaction between solid and carbon dioxide, and a large amount of thermal energy is involved in the reaction. In addition, it takes a long time for carbonation, resulting in high costs and not suitable for industrial production. Furthermore, the form of the produced porous spherical calcium carbonate is a plate-like spherical aggregate, which is different from the crossed disk shape, hamburger shape or disk shape of the present invention.

The present invention aims to dramatically expand the uses, and in industrial use, the dispersibility is improved and the physical properties are improved from the plate-like form due to the improvement of conventional processing steps and the increased usage. The purpose of this work is to make the shape of calcium carbonate that is improved and has a compounding effect into a disk shape and to control the particle diameter, and by using this calcium carbonate carbonate to cross and stacking in a hamburger shape, the range of use The purpose is to dramatically expand the.

In addition, a large amount of heat energy is not used for the carbonation reaction, and no organic solvent such as alcohol is used. The production method is suitable for industrial production, and since no organic amine compound is added as an additive, there is no adsorption of the organic amine compound to the produced calcium carbonate. Furthermore, soluble calcium salts and soluble carbonates that are raw materials Since high-purity products are easily available at low cost from the market, the obtained calcium carbonate conforms to the Japanese Pharmacopoeia and food additive standards, and an aqueous solution of soluble calcium salt and carbonate is added dropwise. By making the reaction, a method suitable for industrial production, synthesizing disk-shaped vaterite-type calcium carbonate and crossing this disk-shaped calcium carbonate Nbanga - are intended to be laminated to form.
The present invention is a monodispersed, disk-shaped vaterite-type calcium carbonate that can be used in a wide range of fields and can be efficiently and economically produced in a short time and with simple equipment and operation. An object of the present invention is to provide an industrially advantageous method capable of further expanding the use range by crossing disk-like calcium carbonate or laminating them in a hamburger shape.

As a result of diligent research, the inventor of the present application has made use of the advantage of the simplicity of the solution method in order to achieve the above-mentioned problem, and soluble carbonate in soluble calcium salt, or soluble calcium salt in soluble carbonate, temperature conditions, dropping rate and By conducting a carbonation reaction by controlling the stirring speed, a method for synthesizing discoidal vaterite-type calcium carbonate as primary particles was found, and due to the difference in the stirring speed in this reaction, the form of the produced vaterite-type calcium carbonate is It has been found and realized to change to a crossed disk shape, a hamburger shape or a disk shape.
The soluble calcium salt of the present invention includes calcium chloride, calcium bromide, calcium iodide, calcium nitrate, calcium nitrite, calcium formate, calcium acetate, calcium ascorbate, calcium lactate, calcium citrate, and calcium gluconate. If it is soluble, it may be used alone or in combination of two or more. The soluble carbonate may be used alone or in combination of two or more, as long as it is soluble in sodium carbonate, potassium carbonate, ammonium carbonate or sodium hydrogen carbonate water. When producing the vaterite-type intersecting disc-like, disc-like and hamburger-like calcium carbonate, the concentration of each soluble calcium salt and soluble carbonate at this time is 0.1-1 mol / L, preferably 0.3-0. 0.7 mol / L is good, and the dropping time is 0.1 to 10 hours, preferably 0.5 to 2 hours.
In the production of the intersecting disc-shaped vaterite type calcium carbonate, the reaction temperature is 20 to 65 ° C., preferably 35 to 55, and the stirring speed is 50 to 1000 rpm or less, preferably 300 to 300 rpm for the turbine type stirring blade. 800 rpm is good.
In the production of hamburger-like vaterite-type calcium carbonate, the reaction temperature is 5 to 50 ° C., preferably 20 to 40 ° C. The stirring speed is 500 to 1500 rpm, preferably 750 to 1250 rpm for the turbine type stirring blade. Is good.
In the production of disk-shaped vaterite type calcium carbonate, the reaction temperature is 5 to 50 ° C., preferably 20 to 45, and the stirring speed is more than 1200 rpm, preferably 1500 rpm or more for the turbine type stirring blade.
The method for producing the vaterite-type intersecting disc-shaped, hamburger-shaped disc-shaped or disc-shaped calcium carbonate according to the present invention comprises the steps of dropping a soluble calcium salt aqueous solution into a soluble carbonate aqueous solution or dropping a soluble carbonate aqueous solution into a soluble calcium salt aqueous solution. It is characterized by changing the temperature and stirring conditions. The particle size of the calcium carbonate to be produced is a vaterite type calcium carbonate having a crossed disc shape, a hamburger shape or a disc shape with 1 to 20 μm.

When the solution concentration is less than 0.1 mol / L, since the concentration of the produced calcium carbonate is low, it takes time for filtration and drying, resulting in poor productivity and not industrial. On the other hand, when the solution concentration exceeds 1 mol / L, the reaction becomes non-uniform and the production of calcite cubic calcium carbonate increases, resulting in a mixture of disk-like vaterite calcium carbonate and calcite cubic calcium carbonate. A homogeneous reaction product is obtained. Furthermore, when the dropping time is less than 0.1 hour, it becomes the same as the mixing reaction, and the generation of spherical particles increases and becomes nonuniform. On the other hand, when the dropping time exceeds 6 hours, the production of calcite cubic calcium carbonate increases and becomes non-uniform.

The production temperature range of the calcium carbonate of the present invention is 5 to 65 ° C., but the production temperature range is different depending on each form, and the product form at a temperature other than the temperature range is slightly different. In the crossed disc shape, when the specified temperature is exceeded, the vaterite type crystal is not generated and the aragonite type crystal is generated and the form is also columnar or needle-like. The shape is similar to the shape. In the hamburger shape, an elliptical shape is generated at a temperature lower than the specified temperature. However, when the temperature exceeds the specified temperature, a mixture of a crossed disk shape and a hamburger shape is formed. In the disk shape, when the specified temperature is exceeded, calcite-type crystals and aragonite-type crystals start to form, and the form also becomes cubic, columnar, or needle-like, and when the temperature is lower than the specified temperature, calcite-type crystals are formed and the form is also It becomes a cubic shape.

As described above, the method for producing calcium carbonate according to the present invention comprises adding a soluble carbonate aqueous solution dropwise to a soluble calcium salt aqueous solution or adding a soluble calcium salt aqueous solution to a soluble carbonate aqueous solution at a certain concentration, reaction temperature, dropping time and stirring. It is a production method for producing a vaterite-type intersecting disc shape, a hamburger disc shape or a disc-like calcium carbonate only by reacting under conditions. Compared with the plate or oval spherical calcium carbonate production methods that have been announced so far, no special heat energy is required, and since organic solvents such as methanol are not used, the recovery cost of organic solvents and special The recovery equipment is unnecessary, and the addition of organic amine compound, which is a special additive, is unnecessary, so that the purity of calcium carbonate increases, and further, the produced vaterite type cross disk shape, hamburger disk shape or disk-like carbonic acid form. Since calcium is monodispersed and the particle size is controlled, the application is dramatically expanded and can be used in a wide range of business fields.
In addition, since the production apparatus is simple and the operation is simple, it is an industrially advantageous method for producing a vaterite-type crossed disk, hamburger or disk-shaped calcium carbonate that can be manufactured efficiently and economically.

The present invention relates to a vaterite-type crossed disc, hamburger, or disc-like calcium carbonate characterized by performing a carbonation reaction by dropping a soluble carbonate aqueous solution or a soluble calcium salt aqueous solution into a soluble calcium salt aqueous solution or a soluble carbonate aqueous solution. It is a manufacturing method.
An aqueous solution of a highly pure water-soluble calcium salt and / or hydrate thereof is prepared at a concentration of 0.1 to 1 mol / L, preferably 0.3 to 0.7 mol / L. Separately, an aqueous solution having a concentration of 0.3 to 0.7 mol / L is prepared from a highly pure water-soluble carbonate and / or hydrate thereof. If the solution concentration is less than 0.1 mol / L, a large amount of cubic calcium carbonate is produced, and at the same time, the concentration of calcium carbonate is low, so that it takes time for filtration and drying, resulting in poor productivity and not industrial. When the solution concentration is less than 0.1 mol / L, since the concentration of the produced calcium carbonate is low, it takes time for filtration and drying, resulting in poor productivity and not industrial. When the solution concentration exceeds 1 mol / L, the reaction becomes heterogeneous and the production of calcite-type cubic calcium carbonate increases, resulting in a mixture of disk-like vaterite-type calcium carbonate and calcite-type cubic calcium carbonate, resulting in a heterogeneous reaction. Product. At this time, the molar ratio of calcium ions to carbonate ions is preferably 1: 1, and if the molar ratios are different, unreacted calcium ions or carbonate ions remain in the solution, and the effective resources are discarded. Not.

  When the dropping time is 0.5 to 2 hours and the dropping time is less than 0.1 hour, the production of the vaterite-type spherical particles increases as in the mixing reaction, and the disk-shaped vaterite-type calcium carbonate and the vaterite-type spherical calcium carbonate A mixture is formed and becomes non-uniform. When the dropping time exceeds 4 hours, the generation of calcite-type cubic calcium carbonate increases little by little, and a mixture of disk-like vaterite-type calcium carbonate and calcite-type cubic calcium carbonate is generated, resulting in spread of non-uniformity. When the dropping time exceeds 10 hours, calcite-type cubic calcium carbonate is mainly produced.

  The reaction temperature is in the range of 5 to 60 ° C., but a vaterite-type intersecting disc shape, a hamburger-like disc shape or a disc-like shape disc-like calcium carbonate is produced. ~ 35 ° C is optimal, and 30-45 ° C is optimal for discs, and the produced vaterite-type intersecting disc, hamburger or disc-like calcium carbonate has a particle size of 1 to 20 µm and is a vaterite by X-ray diffraction. The content is 90% or more. When the reaction temperature is 60 ° C. or higher, the production of aragonite needle-like or columnar calcium carbonate increases, resulting in a non-uniform product. When the temperature is 20 ° C. or less, agglomerates of disk-like vaterite-type calcium carbonate increase. However, when agitator and ultrasonic stirring are used in combination, the content of the vaterite is 60% or more with good dispersion even when the reaction temperature is 20 ° C. or less. A hamburger disk or disk-shaped vaterite-type calcium carbonate is produced. When the reaction temperature is less than 5 ° C., almost no discoidal vaterite-type calcium carbonate is generated, and it is not economical because a large amount of heat energy is used for cooling.

The use of calcium salts or carbonates that are sparingly or insoluble in water, or the use of either calcium salts or carbonates with soluble salts and the other with sparingly soluble or insoluble salts, the reaction does not go well. Crossed disk, hamburger or disk calcium carbonate is not produced.
Hereinafter, although an example and a comparative example of the present invention explain, the present invention is not limited at all by these.

  Reagent-grade calcium chloride 5.55 g is dissolved in 100 ml of warm water at 50 ° C. Reagent-grade sodium carbonate (5.30 g) was dissolved in 100 ml, and this solution was continuously added dropwise over 1 hour while stirring the calcium chloride solution with a turbine-type stirrer at 500 rpm. After completion of dropping, the mixture was filtered and washed with water, and then dried at 110 ° C. for 12 hours. The powder X diffraction result of this dry solid was shown in FIG. 1. As a result of analyzing this spectrum, the content of vaterite was 97%. The results of observation with a scanning electron microscope are shown in FIG. From the photograph, it was crossed disk-like calcium carbonate in which 5 to 20 crystals of disk-like crystals having a basic particle diameter of 5 to 15 μm were bonded and grown in a crossing manner. As a result of chemical analysis, the content of calcium carbonate was 99.9% or more.

  7.36 g of reagent-grade calcium chloride dihydrate is dissolved in 200 ml of warm water at 40 ° C. Reagent-grade sodium carbonate (5.30 g) was dissolved in 100 ml, and this solution was continuously added dropwise over 1 hour while stirring the calcium chloride solution at 1000 rpm with a turbine-type stirrer. After completion of dropping, the mixture was filtered, washed with water, and then dried at 110 ° C. for 12 hours. As a result of analyzing the powder X-ray diffraction measurement spectrum of this dry solid, the content of vaterite was 96%. As a result of observation with a scanning electron microscope, it was a hamburger-like calcium carbonate in which disk-like crystals having a particle diameter of 8 to 12 μm overlapped in a hamburger shape from FIG. As a result of chemical analysis, the content of calcium carbonate was 99.9% or more.

7.36 g of reagent-grade calcium chloride dihydrate is dissolved in 200 ml of warm water at 40 ° C. Reagent-grade sodium carbonate (5.30 g) was dissolved in 100 ml, and this solution was continuously added dropwise over 1 hour while stirring the calcium chloride solution with a turbine-type stirrer at 3000 rpm. After completion of dropping, the mixture was filtered, washed with water, and then dried at 110 ° C. for 12 hours. As a result of analyzing the powder X-ray diffraction measurement spectrum of this dry solid, the content of vaterite was 92%. The results of scanning electron microscope observation are shown in FIG. From the photograph, it was a disk-like crystal having a particle diameter of 5 to 10 μm. As a result of chemical analysis, the content of calcium carbonate was 99.9% or more.
[Comparative Example 1]

The same procedure as in Example 2 was repeated, except that the sodium carbonate solution was mixed with the calcium chloride solution within 1 minute. As a result of analyzing the powder X diffraction spectrum of the obtained dry solid, the content of vaterite was 90%. The results of observation with a scanning electron microscope are shown in FIG. The particle size was 2-4 μm spherical vaterite and cubic calcite. As a result of chemical analysis, the content of calcium carbonate was 99.9% or more.
[Comparative Example 2]

  Example 3 was repeated except that the reaction temperature was 15 ° C. As a result of analyzing the powder X diffraction spectrum of the obtained dry solid, the content of vaterite was 92%. As a result of observation with a scanning electron microscope, as a result, a disc-like form having a primary particle size of 1 to 10 μm was agglomerated at random, resulting in a disc-like calcium carbonate aggregate having poor dispersibility. As a result of chemical analysis, the content of calcium carbonate was 99.9% or more.

  The same procedure as in Example 1 was conducted except that 3.68 g of calcium chloride dihydrate and 5.90 g of calcium nitrate tetrahydrate were dissolved in 200 ml of warm water at 40 ° C. The result of having measured the powder X diffraction of the obtained dry solid substance is a figure, and the content rate of vaterite was 94%. As a result of observation with a scanning electron microscope, the particle diameter was a crossed disk shape of 3 to 6 μm. As a result of chemical analysis, the content of calcium carbonate was 99.9% or more.

Dissolve 11.04 g of reagent grade calcium chloride dihydrate in 200 ml of warm water at 55 ° C. Reagent-grade sodium carbonate (10.37 g) was dissolved in 100 ml, and this solution was continuously added dropwise over 1 hour while stirring the calcium chloride solution with a turbine-type stirrer at 700 rpm. After completion of dropping, the mixture was filtered, washed with water, and then dried at 110 ° C. for 12 hours. As a result of measuring the powder X diffraction of this dry solid, the content rate of the vaterite was 90%. As a result of observation with a scanning electron microscope, it was found to be intersecting disc-like calcium carbonate in which 5 to 20 disc-like crystals having a basic particle diameter of 4 to 8 μm were bonded and grown in an intersecting manner. As a result of chemical analysis, the content of calcium carbonate was 99.9% or more.
[Comparative Example 3]

The same procedure as in Example 1 was performed except that the reaction temperature was 70 ° C. As a result of measuring the powder X diffraction of the obtained dry solid, vaterite is the main component, a small amount of vaterite and calcite are recognized, and the content of aragonite is 91%. As a result of observation with a scanning electron microscope, The particle size was a mixture of needles, columns, and cubes having a size of 1 to 10 μm.

10.30 g of reagent-grade calcium chloride dihydrate is dissolved in 200 ml of warm water at 35 ° C. 7.42 g of reagent-grade sodium carbonate was dissolved in 100 ml, and this solution was continuously added dropwise over 3 hours while stirring the calcium chloride solution with a turbine-type stirrer at 1500 rpm. After completion of dropping, the mixture was filtered, washed with water, and then dried at 110 ° C. for 12 hours. As a result of analyzing the powder X-ray diffraction measurement spectrum of this dry solid, the content of vaterite was 92%. As a result of observation with a scanning electron microscope, it was a hamburger-like calcium carbonate in which disk-like crystals having a particle diameter of 5 to 8 μm overlapped in a hamburger shape from FIG. As a result of chemical analysis, the content of calcium carbonate was 99.9% or more.

(Example 1) which is an X-ray-diffraction figure of a cross disk-like vaterite type calcium carbonate. (Example 1) which is a scanning electron micrograph showing the particle | grain structure of a cross disk-like vaterite type | mold calcium carbonate. It is a scanning electron micrograph showing the particle structure of a vaterite type hamburger calcium carbonate (Example 2). It is a scanning electron micrograph showing the particle structure of disk-like vaterite type calcium carbonate (Example 3). It is a scanning electron micrograph showing the particle structure of vaterite spherical calcium carbonate (Comparative Example 1).

Claims (5)

Vaterite-type calcium carbonate having a 1-20 μm crossed disk shape and a hamburger-like shape in which soluble carbonate and soluble calcium salt are stirred and reacted in an aqueous solution and stacked as basic particles. Manufacture of vaterite-type calcium carbonate having a 1-20 μm crossed disk shape, hamburger shape or disk shape formed by stacking disk-shaped calcium carbonate obtained by stirring soluble carbonate and soluble calcium salt in an aqueous solution as basic particles Method. The vaterite according to claim 2, wherein the soluble carbonate is at least one selected from sodium carbonate, potassium carbonate, or ammonium carbonate, and the soluble calcium salt is at least one selected from calcium chloride, calcium nitrate, or calcium lactate. Type calcium carbonate production method. The concentration of the soluble carbonate and soluble calcium salt is 0.1 to 1 mol / L, the dropping time is 0.1 to 10 hours, and the reaction temperature is 5 to 60 ° C. The manufacturing method of the vaterite type | mold calcium carbonate which made cross disk shape, a hamburger shape, or the disk shape form by making the disk-shaped calcium carbonate of description into a basic particle and changing a stirring state. The method for producing a crossed disk-shaped vaterite-type calcium carbonate, wherein changing the stirring state according to any one of claims 2 to 4 is a reaction condition of a reaction temperature of 20 to 65 ° C and a rotation speed of 50 to 1000 rpm. ,
A reaction temperature of 5 to 50 ° C. and a rotational speed of 500 to 1500 rpm.
A method for producing a disk-shaped vaterite-type calcium carbonate having a reaction temperature of 5 to 50 ° C. and a rotation speed of 1200 to 5000 rpm.