CA2635023C - Control of particle size of aragonite precipitated calcium carbonate - Google Patents
Control of particle size of aragonite precipitated calcium carbonate Download PDFInfo
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- CA2635023C CA2635023C CA2635023A CA2635023A CA2635023C CA 2635023 C CA2635023 C CA 2635023C CA 2635023 A CA2635023 A CA 2635023A CA 2635023 A CA2635023 A CA 2635023A CA 2635023 C CA2635023 C CA 2635023C
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- suspension
- calcium hydroxide
- aragonite
- calcium carbonate
- aqueous solution
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/18—Carbonates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/02—Oxides or hydroxides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/03—Particle morphology depicted by an image obtained by SEM
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/10—Particle morphology extending in one dimension, e.g. needle-like
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The present invention is related to a method of controlling particle sizes of aragonite-type precipitated calcium carbonate comprising the steps of manufacturing various-sized calcium hydroxide through the hydration reaction of CaO, which is caustic lime, while changing the solid-liquid ratio of caustic lime and the initial reaction temperature to 10 ~ 80 ~G stabilizing calcium hydroxide by adding the aqueous solution of sodium hydroxide to the suspension of calcium hydroxide; supplying the aqueous solution of sodium carbonate while stirring the suspension in the above stabilizing step; and washing, filtering, and drying the above suspension of calcium carbonate.
Description
CONTROL OF PARTICLE SIZE OF
ARAGONITE PRECIPITATED CALCIUM CARBONATE
[Technical Field]
The present invention is related to a method for manufacturing aragonite-type precipitated calcium carbonate according to the homogeneous precipitation reaction between calcium hydroxide and aqueous solution of sodium carbonate. Particularly, the present invention is related to a method for manufacturing aragonite particles having various sizes by making the suspension of calcium hydroxide having various sizes by changing the solid-liquid ratio of the hydration reaction of caustic lime, and using sodium carbonate and sodium hydroxide.
[Background Art]
Precipitated calcium carbonate is an inorganic material which is not soluble in pure water, has a proper specific gravity, and has properties such as a high whiteness, non-combustibility, etc. It is applicable extensively as inorganic filler in various industrial areas such as rubber, paint, plastic, paper, cosmetics, and toothpaste industries.
Particularly, aragonite-type precipitated calcium carbonate is needle shaped and has a very large aspect ratio (ratio of the size with respect to the length of crystals). It may be substituted as a new functional in organic material
ARAGONITE PRECIPITATED CALCIUM CARBONATE
[Technical Field]
The present invention is related to a method for manufacturing aragonite-type precipitated calcium carbonate according to the homogeneous precipitation reaction between calcium hydroxide and aqueous solution of sodium carbonate. Particularly, the present invention is related to a method for manufacturing aragonite particles having various sizes by making the suspension of calcium hydroxide having various sizes by changing the solid-liquid ratio of the hydration reaction of caustic lime, and using sodium carbonate and sodium hydroxide.
[Background Art]
Precipitated calcium carbonate is an inorganic material which is not soluble in pure water, has a proper specific gravity, and has properties such as a high whiteness, non-combustibility, etc. It is applicable extensively as inorganic filler in various industrial areas such as rubber, paint, plastic, paper, cosmetics, and toothpaste industries.
Particularly, aragonite-type precipitated calcium carbonate is needle shaped and has a very large aspect ratio (ratio of the size with respect to the length of crystals). It may be substituted as a new functional in organic material
2 that can grant the mechanical functionality as well as optical functionality since its strength may be enhanced, its whiteness may be improved, and its opaqueness may be controlled owing to the complicated surface structure of the needle shape when it is used as a filler of rubbers, plastics, and coating materials, or an industrial material for pigments for paper.
Since the above-described aragonite may have been applied to many more areas by controlling its particle sizes or aspect ratios of the needle shape, the technology of controlling its particle sizes has been developed continuously.
The present invention is devised in order to solve the problems with prior art.
[Summary of the Invention]
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the process particularly pointed out in the written description and claims hereof, as well as the appended drawings.
The present invention is to provide a new method for manufacturing aragonite with controlled particle sizes and aspect ratios using the suspension of calcium hydroxide
Since the above-described aragonite may have been applied to many more areas by controlling its particle sizes or aspect ratios of the needle shape, the technology of controlling its particle sizes has been developed continuously.
The present invention is devised in order to solve the problems with prior art.
[Summary of the Invention]
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the process particularly pointed out in the written description and claims hereof, as well as the appended drawings.
The present invention is to provide a new method for manufacturing aragonite with controlled particle sizes and aspect ratios using the suspension of calcium hydroxide
3 manufactured by controlling the solid-liquid ratios and changing the initial reaction temperature in the step of hydration of CaO, which is the caustic lime component manufactured by the calcination of limestone.
Another objective of the present invention_to provide a new method for manufacturing calcium hydroxide having various particle sizes.
It is still another object of the present invention to provide a method of manufacture of highly functional and high-value-added aragonite-type precipitated calcium carbonate by improving the aspect ratio and production yield through the manufacture of precipitated calcium carbonate by using the aqueous solution reaction of sodium carbonate.
The method for manufacturing aragonite according to the present invention to solve the above-described pr_oblems is a new method enabling the control of various sizes comprising the steps of manufacturing the caustic lime by calcination of limestone; manufacturing the suspension of calcium hydroxide through the hydration reaction while changing the solid-liquid ratio and the initial reaction temperature of water using the solid-liquid ratio of caustic lime to water of 1 to 30 or greater parts by weight, preferably, 1 to 30 - 70 parts by weight; manufacturing aragonite-type sedimentary calcium carbonate through the homogeneous precipitation reaction of the aqueous solution of sodium carbonate by adding sodium
Another objective of the present invention_to provide a new method for manufacturing calcium hydroxide having various particle sizes.
It is still another object of the present invention to provide a method of manufacture of highly functional and high-value-added aragonite-type precipitated calcium carbonate by improving the aspect ratio and production yield through the manufacture of precipitated calcium carbonate by using the aqueous solution reaction of sodium carbonate.
The method for manufacturing aragonite according to the present invention to solve the above-described pr_oblems is a new method enabling the control of various sizes comprising the steps of manufacturing the caustic lime by calcination of limestone; manufacturing the suspension of calcium hydroxide through the hydration reaction while changing the solid-liquid ratio and the initial reaction temperature of water using the solid-liquid ratio of caustic lime to water of 1 to 30 or greater parts by weight, preferably, 1 to 30 - 70 parts by weight; manufacturing aragonite-type sedimentary calcium carbonate through the homogeneous precipitation reaction of the aqueous solution of sodium carbonate by adding sodium
4 hydroxide and sodium carbonate to the above suspension of calcium hydroxide; and obtaining aragonite by washing, filtering, and drying the above aragonite-type sedimentary calcium carbonate.
The above method for manufacturing aragonite-type sedimentary calcium carbonate is characterized by comprising the steps of manufacturing the suspension in which calcium hydroxide is dispersed in distilled water; stabilization in which the aqueous solution of sodium hydroxide is added to the suspension of calcium hydroxide produced during the above step of manufacture of the suspension; and mixing so that the suspension of calcium carbonate having a constant concentration is formed by supplying the aqueous solution of sodium carbonate at a fixed rate while mixing the above suspension of calcium hydroxide.
Since CaO used in the present invention reacts with water readily in the air, and therefore, it is difficult to secure CaO having proper characteristics, CaO is dehydrated at 700 C
for about 1 hour before the hydration reaction of CaO in the present invention. In the step of manufacturing calcium hydroxide having various particle sizes according to the present invention, the ratio of mixing CaO and water is changed, an aqueous solution having the solid-liquid ratio of 1 20 - 70 preferably is filled into a reactor, and the hydration reaction is progressed by varying the initial temperature of water for the hydration reaction to be 10 - 90 C
In the present invention, the solid-liquid ratio, i.e., the ratio of mixing water and CaO, is not greatly limited, but it is preferable that the ratio of Ca0 to water is 1 to about
The above method for manufacturing aragonite-type sedimentary calcium carbonate is characterized by comprising the steps of manufacturing the suspension in which calcium hydroxide is dispersed in distilled water; stabilization in which the aqueous solution of sodium hydroxide is added to the suspension of calcium hydroxide produced during the above step of manufacture of the suspension; and mixing so that the suspension of calcium carbonate having a constant concentration is formed by supplying the aqueous solution of sodium carbonate at a fixed rate while mixing the above suspension of calcium hydroxide.
Since CaO used in the present invention reacts with water readily in the air, and therefore, it is difficult to secure CaO having proper characteristics, CaO is dehydrated at 700 C
for about 1 hour before the hydration reaction of CaO in the present invention. In the step of manufacturing calcium hydroxide having various particle sizes according to the present invention, the ratio of mixing CaO and water is changed, an aqueous solution having the solid-liquid ratio of 1 20 - 70 preferably is filled into a reactor, and the hydration reaction is progressed by varying the initial temperature of water for the hydration reaction to be 10 - 90 C
In the present invention, the solid-liquid ratio, i.e., the ratio of mixing water and CaO, is not greatly limited, but it is preferable that the ratio of Ca0 to water is 1 to about
5 20 - 60. If the ratio is less than 20, it is not desirable in that there is no big difference in particle sizes of the suspension of calcium hydroxide produced although the initial reaction temperature is changed; and if it is greater than 60, it is not recommended since there are problems in productivity.
Also, the initial reaction temperature refers to the temperature raised when there is water only in the reactor, which is controlled to be 10 - 90- Cfor the reaction. If it is below 10 C it is not desirable in that the particle sizes of calcium hydroxide are not changed greatly even if the solid-liquid ratio is changed; and if it is higher than 90 C; it is not desirable both in that the particle size is rather reduced, and it is difficult to control the heat of reaction.
As to the reactor for the hydration of CaO of the present invention, a reactor filled with water and equipped with a thermostatic water bath for maintaining a constant temperature, an impeller for mixing, and a thermometer for measuring the temperature is used.
Further, hydrated calcium hydroxide is transferred to a manufacturing device for aragonite-type precipitated calcium carbonate and reacted. The manufacturing device for aragonite-
Also, the initial reaction temperature refers to the temperature raised when there is water only in the reactor, which is controlled to be 10 - 90- Cfor the reaction. If it is below 10 C it is not desirable in that the particle sizes of calcium hydroxide are not changed greatly even if the solid-liquid ratio is changed; and if it is higher than 90 C; it is not desirable both in that the particle size is rather reduced, and it is difficult to control the heat of reaction.
As to the reactor for the hydration of CaO of the present invention, a reactor filled with water and equipped with a thermostatic water bath for maintaining a constant temperature, an impeller for mixing, and a thermometer for measuring the temperature is used.
Further, hydrated calcium hydroxide is transferred to a manufacturing device for aragonite-type precipitated calcium carbonate and reacted. The manufacturing device for aragonite-
6 PCT/KR2005/004688 type sedimentary calcium carbonate according to the present invention is comprised of a reactor in which the suspension of calcium hydroxide and the aqueous solution of sodium carbonate are mixed; a thermostatic water bath filled with water and equipped with the above reactor and a temperature control means so that the inside of the reactor is maintained at a constant temperature; a supplying part inserted into the above reactor; an injector of sodium carbonate installed at the pipe extended outside of the reactor from the supplying part so that the amount of supply of the aqueous solution of sodium carbonate is controlled by a flowmeter; a rotating axis installed in such a way that it penetrates the cover of the above reactor and rotates; a stirring wing installed at the inner cross-section of the above rotating axis; and a stirrer equipped with a motor installed at the outer cross-section of the above rotating axis for mixing the suspension of calcium hydroxide and carbon dioxide. In the reactor for manufacturing the above aragonite, the following steps for manufacturing calcium carbonate are performed: the transfer of the suspension of calcium hydroxide manufactured to the above reactor for manufacturing calcium hydroxide to the reactor;
stabilization by supplying the aqueous solution of sodium hydroxide to the above suspension; mixing and stirring by supplying the aqueous solution of sodium carbonate at a constant rate; and washing, filtering, and drying.
stabilization by supplying the aqueous solution of sodium hydroxide to the above suspension; mixing and stirring by supplying the aqueous solution of sodium carbonate at a constant rate; and washing, filtering, and drying.
7 Here, in the above step of stabilization, 0.1 - 0.2 moles of the suspension of calcium hydroxide and 0.1 - 2.0 moles of the aqueous solution of sodium hydroxide are mixed. And in the above step of stirring, 0.1 - 1.5 moles of the aqueous solution of sodium carbonate is added to the suspension of calcium hydroxide at a rate of 1 10 mL/minute and reacted maintaining the temperature at 10 ~ 80 C. The above numbers of moles of calcium hydroxide and sodium hydroxide are within the range facilitating the manufacture of single-phase aragonite in the present invention. And if the rate of the addition of aqueous solution of sodium carbonate is lower than the above rate of addition, the rate of reaction may be too slow; and if it is higher than the above rate of addition, it may be difficult to manufacture aragonite having homogeneous physical properties since the reaction heat is too high. It is preferable to use alcohols to wash the above manufactured aragonite.
[Brief Description of the Drawings]
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the purpose, advantages, and principles of the invention.
In the drawings,
[Brief Description of the Drawings]
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the purpose, advantages, and principles of the invention.
In the drawings,
8 Figure 1 shows particle sizes of calcium hydroxide according to changes in the initial reaction temperature and the solid-liquid ratio of the hydration reaction;
Figure 2 shows particle sizes of calcium hydroxide and subsequent particle sizes of aragonite-type precipitated calcium carbonate according to the initial reaction temperature;
F'igure 3 shows the SEM photograph of aragonite-type precipitated calcium carbonate; and Figure 4 shows the yields of aragonite-type precipitated calcium carbonate according to the initial reaction temperature of hydration.
[Description of the Preferred Embodiments of the Invention]
Hereinafter, the present invention is illustrated in terms of a few preferred embodiments of the present invention as follows:
<Preferred Embodiment 1>
Changes in the diameter of calcium hydroxide according to the conditions for hydration reaction The hydration reaction was performed under two conditions of 1 : 25 and 1 : 40 for the rate-liquid ratio of CaO to water in order to have the initial temperature of the inside of the
Figure 2 shows particle sizes of calcium hydroxide and subsequent particle sizes of aragonite-type precipitated calcium carbonate according to the initial reaction temperature;
F'igure 3 shows the SEM photograph of aragonite-type precipitated calcium carbonate; and Figure 4 shows the yields of aragonite-type precipitated calcium carbonate according to the initial reaction temperature of hydration.
[Description of the Preferred Embodiments of the Invention]
Hereinafter, the present invention is illustrated in terms of a few preferred embodiments of the present invention as follows:
<Preferred Embodiment 1>
Changes in the diameter of calcium hydroxide according to the conditions for hydration reaction The hydration reaction was performed under two conditions of 1 : 25 and 1 : 40 for the rate-liquid ratio of CaO to water in order to have the initial temperature of the inside of the
9 reactor constant in the temperature range of 10 - 75 C The reaction time was for 30 minutes, and the rate of stirring was maintained to be constant at 400 rpm.
Since CaO, used as a sample in the hydration reaction, reacted with water readily even in the air, it was dehydrated at 700 C for 1 hour right before the hydration reaction. The particle size of calcium hydroxide produced after the hydration reaction was measured by using ELS-8000 (Otsuka Electronics Company), and the results of the measurement were shown in Figure 1. As seen in Figure 1, the particle size was smaller when the solid-liquid ratio was 1. 40 than when it was 1 : 25, and the particle size was changed greatly as the initial reaction temperature was increased, i.e., at a temperature higher than 50'C; thus enabling the manufacture of calcium hydroxide having various diameters.
<Preferred Embodiment 2>
Affect of the particle size of calcium hydroxide on the size of aragonite The 1.5-mole suspension of calcium hydroxide having various part.icle sizes manufactured in Preferred Embodiment 1 shown in Figure 2 was mixed with the 1.0-mole aqueous solution of sodium hydroxide, and 1.5-mole aqueous solution of sodium carbonate was added to the above mixture at a rate of 3 mL/minute and reacted at 55 C for 2 hours. The relationship between the particle size of aragonite and that of calcium hydroxide was shown in Figure 2, and the purity of single-phase aragonite was measured by using SEM (Leo 1455VP) 5 photograph shown in Figure 3 and x-ray diffraction pattern.
The results of the measurement are shown in figure 4.
As shown in Figure 3, single-phase needle-shaped aragonite sedimentary calcium carbonate was obtained irrespective to its diameter, i.e., with any diameter, and the
Since CaO, used as a sample in the hydration reaction, reacted with water readily even in the air, it was dehydrated at 700 C for 1 hour right before the hydration reaction. The particle size of calcium hydroxide produced after the hydration reaction was measured by using ELS-8000 (Otsuka Electronics Company), and the results of the measurement were shown in Figure 1. As seen in Figure 1, the particle size was smaller when the solid-liquid ratio was 1. 40 than when it was 1 : 25, and the particle size was changed greatly as the initial reaction temperature was increased, i.e., at a temperature higher than 50'C; thus enabling the manufacture of calcium hydroxide having various diameters.
<Preferred Embodiment 2>
Affect of the particle size of calcium hydroxide on the size of aragonite The 1.5-mole suspension of calcium hydroxide having various part.icle sizes manufactured in Preferred Embodiment 1 shown in Figure 2 was mixed with the 1.0-mole aqueous solution of sodium hydroxide, and 1.5-mole aqueous solution of sodium carbonate was added to the above mixture at a rate of 3 mL/minute and reacted at 55 C for 2 hours. The relationship between the particle size of aragonite and that of calcium hydroxide was shown in Figure 2, and the purity of single-phase aragonite was measured by using SEM (Leo 1455VP) 5 photograph shown in Figure 3 and x-ray diffraction pattern.
The results of the measurement are shown in figure 4.
As shown in Figure 3, single-phase needle-shaped aragonite sedimentary calcium carbonate was obtained irrespective to its diameter, i.e., with any diameter, and the
10 yield of aragonite with calcite suppressed was shown to be 90%
or greater as shown in Figure 4.
As shown in Figure 2, the diameter of aragonite was increased as the diameter of calcium hydroxide was increased, and it was possible to obtain large-sized aragonite particles when the initial reaction temperature was 50 C or higher during the hydration reaction for manufacturing calcium hydroxide.
The reasons for this seemed to be that the particle size of calcium hydroxide was maximized if the initial temperature of hydration reaction was 50 C or higher, and the particle size of the product was increased greatly if the particles of calcium hydroxide were produced by sodium carbonate since the rate of elution of Caz+ in the particles was lowered as the specific surface area was reduced according to the particle size and the rate of growth of aragonite was fast.
[Industrial Applicability]
or greater as shown in Figure 4.
As shown in Figure 2, the diameter of aragonite was increased as the diameter of calcium hydroxide was increased, and it was possible to obtain large-sized aragonite particles when the initial reaction temperature was 50 C or higher during the hydration reaction for manufacturing calcium hydroxide.
The reasons for this seemed to be that the particle size of calcium hydroxide was maximized if the initial temperature of hydration reaction was 50 C or higher, and the particle size of the product was increased greatly if the particles of calcium hydroxide were produced by sodium carbonate since the rate of elution of Caz+ in the particles was lowered as the specific surface area was reduced according to the particle size and the rate of growth of aragonite was fast.
[Industrial Applicability]
11 In the hydration reaction of CaO according to the present invention, calcium hydroxide having various sizes was obtained unexpectedly by controlling the initial reaction temperature.
Particularly, provided in the present invention is a new method for manufacturing large- and various-particle-sized needle-shaped aragonite-type calcium carbonate by the homogeneous precipitation reaction of the particles of calcium hydroxide in the aqueous solution of sodium carbonate as the particle size of calcium hydroxide was increased at temperatures higher than 50 C
Accordingly, a simple, economic, new, and reproducible method for manufacturing aragonite, through highly functional and high-value-added aragonite-type sedimentary calcium carbonate may be manufactured by increasing its aspect ratio and yield of production, is provided in the present invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the disclosed process and product without departing from the scope or spirit of the invention. Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
Particularly, provided in the present invention is a new method for manufacturing large- and various-particle-sized needle-shaped aragonite-type calcium carbonate by the homogeneous precipitation reaction of the particles of calcium hydroxide in the aqueous solution of sodium carbonate as the particle size of calcium hydroxide was increased at temperatures higher than 50 C
Accordingly, a simple, economic, new, and reproducible method for manufacturing aragonite, through highly functional and high-value-added aragonite-type sedimentary calcium carbonate may be manufactured by increasing its aspect ratio and yield of production, is provided in the present invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the disclosed process and product without departing from the scope or spirit of the invention. Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
Claims (2)
1. A method of controlling a size of particles of aragonite-type sedimentary calcium carbonate comprising the steps of:
calcining limestone (Ca(OH)2) to obtain a caustic lime of CaO;
dehydrating the CaO at 700°C for about an hour;
manufacturing a suspension of calcium hydroxide in which the size of particles and an aspect ratio in the suspension can be controlled by changing a solid-liquid ratio and an initial reaction temperature by performing reaction at the initial reaction temperature of over 50 to 80°C using a ratio of the dehydrated CaO to water of 1 to about 20 - 60;
stabilizing said suspension of various-sized calcium hydroxide by adding an aqueous solution of sodium hydroxide to said suspension of various-sized calcium hydroxide;
manufacturing a suspension of calcium carbonate by continuously adding an aqueous solution of sodium carbonate to said suspension of various-sized calcium hydroxide at a speed of 1-10ml/minutes while stirring said stabilized suspension of various-sized calcium hydroxide; and washing, filtering, and drying said suspension of calcium carbonate.
calcining limestone (Ca(OH)2) to obtain a caustic lime of CaO;
dehydrating the CaO at 700°C for about an hour;
manufacturing a suspension of calcium hydroxide in which the size of particles and an aspect ratio in the suspension can be controlled by changing a solid-liquid ratio and an initial reaction temperature by performing reaction at the initial reaction temperature of over 50 to 80°C using a ratio of the dehydrated CaO to water of 1 to about 20 - 60;
stabilizing said suspension of various-sized calcium hydroxide by adding an aqueous solution of sodium hydroxide to said suspension of various-sized calcium hydroxide;
manufacturing a suspension of calcium carbonate by continuously adding an aqueous solution of sodium carbonate to said suspension of various-sized calcium hydroxide at a speed of 1-10ml/minutes while stirring said stabilized suspension of various-sized calcium hydroxide; and washing, filtering, and drying said suspension of calcium carbonate.
2. The method of controlling a size of particles of aragonite-type sedimentary calcium carbonate of Claim 1, characterized in that:
0.1-0.2 moles of said aqueous solution of sodium hydroxide is put into and mixed with 0.1-2.0 moles of said suspension of various-sized calcium hydroxide in said stabilizing step.
0.1-0.2 moles of said aqueous solution of sodium hydroxide is put into and mixed with 0.1-2.0 moles of said suspension of various-sized calcium hydroxide in said stabilizing step.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020050136061A KR100720859B1 (en) | 2005-12-30 | 2005-12-30 | Control of particle size of aragonite precipitated calcium carbonate |
| KR10-2005-0136061 | 2005-12-30 | ||
| PCT/KR2005/004688 WO2007078016A1 (en) | 2005-12-30 | 2005-12-31 | Control of particle size of aragonite precipitated calcium carbonate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2635023A1 CA2635023A1 (en) | 2007-07-12 |
| CA2635023C true CA2635023C (en) | 2012-06-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2635023A Active CA2635023C (en) | 2005-12-30 | 2005-12-31 | Control of particle size of aragonite precipitated calcium carbonate |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR100720859B1 (en) |
| CA (1) | CA2635023C (en) |
| WO (1) | WO2007078016A1 (en) |
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| DK2442749T3 (en) | 2009-06-15 | 2019-05-27 | Cartiheal 2009 Ltd | FIXED FORMS OF REPAIR OF TISSUE |
| MX2014003524A (en) | 2011-09-23 | 2014-07-14 | Unilever Nv | Oral care compositions. |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2652032B2 (en) * | 1988-04-12 | 1997-09-10 | 丸尾カルシウム株式会社 | Method for producing aragonite crystalline calcium carbonate |
| KR950001788B1 (en) * | 1988-09-16 | 1995-03-02 | 마루오 칼슘 가부시끼가이샤 | Method of preparaing aragonite form of caco3 |
| US6190633B1 (en) * | 1996-12-09 | 2001-02-20 | Nippon Paper Industries Co., Ltd. | Process for preparing calcium carbonate |
| JP3874978B2 (en) * | 2000-01-18 | 2007-01-31 | 日本製紙株式会社 | Method for producing calcium carbonate and sodium hydroxide |
| JP3808263B2 (en) * | 2000-01-18 | 2006-08-09 | 日本製紙株式会社 | Method for producing calcium carbonate |
| US6685908B1 (en) * | 2000-03-06 | 2004-02-03 | 3P Technologies Ltd. | Precipitated aragonite and a process for producing it |
| KR100561230B1 (en) * | 2004-05-18 | 2006-03-15 | 한국지질자원연구원 | MANUFACTURING METHOD OF ARAGONITE PRECIPITATED CALCIUM CARBONATE BY HOMOGENEOUS PRECIPITATION OF CaOH2 AND NaCO3 SOLUTION REACTION |
-
2005
- 2005-12-30 KR KR1020050136061A patent/KR100720859B1/en active IP Right Grant
- 2005-12-31 WO PCT/KR2005/004688 patent/WO2007078016A1/en active Application Filing
- 2005-12-31 CA CA2635023A patent/CA2635023C/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| KR100720859B1 (en) | 2007-05-23 |
| WO2007078016A1 (en) | 2007-07-12 |
| CA2635023A1 (en) | 2007-07-12 |
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