CN113772706A - Preparation method of short column-shaped micron calcium carbonate - Google Patents
Preparation method of short column-shaped micron calcium carbonate Download PDFInfo
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- CN113772706A CN113772706A CN202111252471.8A CN202111252471A CN113772706A CN 113772706 A CN113772706 A CN 113772706A CN 202111252471 A CN202111252471 A CN 202111252471A CN 113772706 A CN113772706 A CN 113772706A
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- C—CHEMISTRY; METALLURGY
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- 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
- C01F11/182—Preparation of calcium carbonate by carbonation of aqueous solutions and characterised by an additive other than CaCO3-seeds
- C01F11/183—Preparation of calcium carbonate by carbonation of aqueous solutions and characterised by an additive other than CaCO3-seeds the additive being an organic compound
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- C—CHEMISTRY; METALLURGY
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- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
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- 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
- C01P2004/20—Particle morphology extending in two dimensions, e.g. plate-like
Abstract
The invention discloses a preparation method of short columnar micron calcium carbonate, which comprises the steps of adding a first crystal form control agent into Ca (OH)2 suspension, and aging for 24-72 hours to obtain refined lime milk; the first crystal form control agent comprises one or more of 2-methyl-2-ethylsuccinic acid, 2-methyl-2-ethylmalonic acid and 2-methylsuccinic acid; conveying the refined lime milk to a bubbling carbonization reaction kettle, introducing mixed gas containing carbon dioxide to carry out a carbonation reaction, adding a second crystal type to control continuous carbonization until the pH value of the slurry is less than or equal to 7 when the reaction is carried out until the pH value of the slurry is = 10-11, and stopping the reaction; the second crystal form control consists of trihydroxy stearic acid glyceride, ethylene bis stearamide and glycerol trihydroxy methyl propane; and dehydrating, drying, crushing and screening the reacted slurry to obtain the short column-shaped micron-sized calcium carbonate. The calcium carbonate prepared by the method has a micron short column structure, is narrow in particle size distribution, regular in appearance and good in dispersity, and provides more diversified appearances for the field of calcium carbonate.
Description
Technical Field
The invention relates to the technical field of calcium carbonate preparation, in particular to a preparation method of short columnar micron calcium carbonate.
Background
Calcium carbonate is an important inorganic material, and has the advantages of low price, easy production, wide source, no toxicity and the like. The calcium carbonate products with different forms have different application fields, the needle-shaped calcium carbonate has high oil absorption and better wear resistance, and can prevent the pollution of thermal induction oil when being applied to a thermal induction coating agent; the cubic calcium carbonate has good dispersibility, and can greatly improve the reinforcing property of rubber when added into rubber mixing; the spherical calcium carbonate has a simple structure, plays a role of a bearing when added into lubricating oil, and greatly improves the lubricating performance; the spindle-shaped calcium carbonate has good effect on improving the gloss and smoothness of the surface of paper; at present, calcium carbonate with different appearances is prepared by controlling the process and using different additives, so that the product has higher application performance and additional value and is still a hot spot for the development of the calcium carbonate industry.
Patent CN00802411.1 provides a method for producing a cylindrical calcium carbonate having excellent dispersibility, an average short diameter of primary particles of 0.1 to 0.5 μm, an average long diameter of primary particles of 0.15 to 1.5 μm, an aspect ratio of 1.5 to 3.0, and a shape of rice grains, corset or angular falling off. In a method for producing calcium carbonate by reacting calcium hydroxide with carbon dioxide, a hydroxyl group-containing organic compound is added in a proportion of 20 to 200 parts by weight relative to 100 parts by weight of a raw material calcium source converted to calcium oxide, and a carbonation reaction is performed. The calcium carbonate prepared by the method has good dispersibility, but a large amount of organic compounds are added, so that the production cost is high, the water pollution is serious, the filtered water is difficult to reuse after the reaction, and the industrial production is difficult to realize.
Patent CN200610023337.X provides a method for controlling the morphology of calcium carbonate, the first step is: dissolving a flowing carrier in an organic solvent, stirring at a high speed, putting the solution into a porous membrane with a clean surface, soaking for 24-48 hours, taking out the membrane, and wiping the surface oil phase clean by using filter paper for later use. The second step is that: preparing a sodium carbonate solution and a calcium chloride solution, respectively placing the sodium carbonate solution and the calcium chloride solution on two sides of the membrane to be used in the first step, adding about 1% of additives into one side of the sodium carbonate solution, wherein the type of the additives depends on the shape to be prepared, adding different additives into different shapes, reacting for 0.1-48 hours, centrifuging and cleaning precipitates in one side of the sodium carbonate solution to obtain a cubic, spherical and shuttleCaCO in shape of column or nano sheet3And (3) obtaining the product. The invention is easy to influence and control the shape and structure of the crystal, the reaction system is relatively stable, the operation is relatively simple, but the method takes calcium chloride and sodium carbonate as raw materials, the precipitated calcium carbonate is produced by adopting a double decomposition reaction method, the raw materials are relatively cheap, the limestone is expensive, and the production cost is high compared with the bubbling carbonization method for preparing the precipitated calcium carbonate.
Patent CN201310629781.6 is a rod-like light calcium carbonate and its preparation method, the rod-like light calcium carbonate has an average short diameter of primary particles of 0.1-0.2 μm, an average long diameter of primary particles of 0.3-2.0 μm, an aspect ratio of 3-20 and a shape mainly in the shape of a rod and/or a cylinder or a needle. The preparation method comprises the following steps: digesting with medium-burned lime and hot water according to the proportion of 1:4-10, then passing through a 60-120 mesh vibrating screen and removing impurities through a hydrocyclone separator to obtain refined slurry, adding a compound crystal form control agent, uniformly stirring, introducing kiln gas for carbonization until the pH value is 6.5-7, stopping carbonization, and dehydrating, drying, crushing and screening the reaction solution to obtain light calcium carbonate. The shape of the calcium carbonate produced by the method is mainly rod-shaped, and the cylindrical proportion is small.
The patent CN 103571235A provides a preparation method of prismatic biological calcium carbonate, which comprises the steps of taking shells as raw materials, washing, soaking and separating the shells in a sodium hydroxide solution or a potassium hydroxide solution to obtain a shell prismatic layer, adding water and one grinding aid of polyacrylic acid, sodium polyacrylate, sodium hexametaphosphate and sodium silicate into the crushed shell prismatic layer for grinding, finally dehydrating and washing to obtain a filter cake, diluting the filter cake again, adding stearic acid, calcium stearate and zinc stearate serving as surface modifiers for modification, and preparing the prismatic biological calcium carbonate. The method for preparing the prismatic calcium carbonate has the disadvantages of troublesome process and complex operation, and the shell is used as a raw material, so that the industrial production is difficult to realize.
The above background disclosure is only for the purpose of assisting understanding of the inventive concept and technical solutions of the present invention, and does not necessarily belong to the prior art of the present patent application, and should not be used for evaluating the novelty and inventive step of the present application in the case that there is no clear evidence that the above content is disclosed at the filing date of the present patent application.
Disclosure of Invention
The invention aims to provide a preparation method of micron-sized calcium carbonate with narrow particle size distribution, good dispersibility and short columnar appearance.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of short-column-shaped micron calcium carbonate comprises the following steps:
s1 calcining limestone to obtain calcium lime, digesting, reacting, and sieving to obtain Ca (OH)2Suspending liquid, adjusting the solid content of the suspending liquid to 5-10%, adding a first crystal form control agent, and aging for 24-72 hours to obtain refined lime milk; the first crystal form control agent comprises one or more of 2-methyl-2-ethylsuccinic acid, 2-methyl-2-ethylmalonic acid and 2-methylsuccinic acid;
s2, conveying the refined lime milk to a bubbling carbonization reaction kettle, introducing mixed gas containing carbon dioxide to carry out a carbonation reaction, adding a second crystal type to control continuous carbonization until the pH value of the slurry is less than or equal to 7 when the reaction is carried out until the pH value of the slurry is = 10-11, and stopping the reaction; the second crystal form control consists of trihydroxy stearic acid glyceride, ethylene bis stearamide and glycerol trihydroxy methyl propane;
and S3, dehydrating the reacted slurry, drying, crushing and screening to obtain the short column-shaped micron-sized calcium carbonate.
The scheme of the invention is further optimized as follows: the addition amount of the crystal form control agent is 1-3% of the dry weight of calcium carbonate in the suspension.
The scheme of the invention is further optimized as follows: the addition amount of the second crystal form control agent is 0.5-1.5% of the dry weight of the calcium carbonate.
The scheme of the invention is further optimized as follows: the mass ratio of trihydroxy stearic acid glyceride, ethylene bis stearamide and glycerol trihydroxy methyl propane in the second crystal control agent is 1: 1.
the scheme of the invention is further optimized as follows: the carbonation reaction is carried out at the temperature of 50-80 ℃, the stirring speed of 300-500 r/min and the carbon dioxide concentration of 10-20% in the mixed gas.
The scheme of the invention is further optimized as follows: and step S1, calcining for 5-10 hours at the temperature of 1000-1300 ℃.
The scheme of the invention is further optimized as follows: and step S1, the digestion reaction is carried out at 40-80 ℃ under the condition that the mass ratio of the quicklime to the water is 1: 5-8.
The scheme of the invention is further optimized as follows: the drying is carried out at the temperature of 110-120 ℃.
Compared with the prior art, the invention has the advantages and beneficial effects that:
1. the method of the invention is carried out on Ca (OH)22-methyl-2-ethylsuccinic acid, 2-methyl-2-ethylmalonic acid or 2-methylsuccinic acid added into the suspension can be adsorbed on CaCO in the growth process of the calcium carbonate carbide crystal3On the particles, influence the growth process of calcium carbonate crystals and thus the CaCO produced3The morphology of the calcium carbonate is promoted to be short columnar.
2. In the method, a second crystal control agent consisting of hyperdispersant trihydroxy stearate, ethylene bis stearamide and glycerol trihydroxy methyl propane is added in the later stage of carbonation reaction to promote the dispersion of calcium carbonate particles, so that micron short-column calcium carbonate with narrow particle size distribution, regular appearance and good dispersibility is prepared.
3. The method has the advantages of simple and feasible preparation process, low production cost, good economic benefit and social benefit, easy realization of industrial production and contribution to the morphological diversity of calcium carbonate.
Drawings
FIG. 1 is a scanning electron micrograph of calcium carbonate prepared in example 1;
FIG. 2 is a scanning electron micrograph of calcium carbonate prepared in example 2;
FIG. 3 is a scanning electron micrograph of calcium carbonate prepared in example 3;
FIG. 4 is a scanning electron micrograph of calcium carbonate prepared in example 4;
FIG. 5 is a scanning electron micrograph of calcium carbonate prepared in comparative example 1;
FIG. 6 is a scanning electron micrograph of calcium carbonate prepared in comparative example 2;
FIG. 7 is a scanning electron micrograph of calcium carbonate prepared in comparative example 3;
fig. 8 is a scanning electron micrograph of the calcium carbonate prepared in comparative example 4.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A preparation method of short-column-shaped micron calcium carbonate comprises the following steps:
s1, calcining limestone at 1000 ℃ for 5h to obtain quick lime, and mixing the quick lime with water at 80 ℃ according to a mass ratio of 1:5, carrying out digestion reaction, sieving by a 100-mesh sieve to obtain Ca (OH)2Suspending liquid, adjusting the solid content of the suspending liquid to 10%, adding 2-methyl-2-ethylsuccinic acid with 3% of the dry weight of calcium carbonate, and aging for 72h to obtain refined lime milk;
s2, conveying the refined lime milk to a bubbling carbonization reaction kettle, controlling the carbonization temperature of the slurry to be 80 ℃, stirring at 500 r/min, introducing mixed gas with the carbon dioxide concentration of 20% to perform carbonation reaction until the pH value of the slurry is =10, adding a second crystal form with the calcium carbonate dry basis mass of 1.5% to control continuous carbonization until the pH value is less than or equal to 7, and stopping the reaction; the second crystal form is controlled by a mass ratio of 1:1:1, trihydroxy stearic acid glyceride, ethylene bis stearamide and glycerol trihydroxy methyl propane;
s3, dehydrating the reacted slurry, drying for 24h at 120 ℃, crushing and screening to obtain the short column-shaped micron-sized calcium carbonate.
The calcium carbonate prepared in this example was subjected to a scanning electron microscope test, and the test result is shown in fig. 1. As can be seen from figure 1, the calcium carbonate has the structure of short column-shaped micron calcium carbonate, narrow particle size distribution, uniform particle size, regular appearance and good dispersibility.
Example 2
A preparation method of short-column-shaped micron calcium carbonate comprises the following steps:
s1 calcining limestone at 1300 deg.C for 10h to obtain quicklime, digesting at 40 deg.C with water at a ratio of lime to water of 1:8, and sieving with 100 mesh sieve to obtain Ca (OH)2Suspending liquid, adjusting the solid content of the suspending liquid to 5%, adding 2-methyl-2-ethylsuccinic acid with 3% of the dry weight of calcium carbonate, and aging for 24h to obtain refined lime milk;
s2, conveying the refined lime milk to a bubbling carbonization reaction kettle, controlling the carbonization temperature of the slurry to be 50 ℃, stirring at 300 r/min, introducing mixed gas with the carbon dioxide concentration of 10% to perform carbonation reaction until the pH value of the slurry is =11, adding a second crystal form with the calcium carbonate dry basis mass of 0.5% to control continuous carbonization until the pH value is less than or equal to 7, and stopping the reaction; the second crystal form is controlled by a mass ratio of 1:1:1, trihydroxy stearic acid glyceride, ethylene bis stearamide and glycerol trihydroxy methyl propane;
s3, dehydrating the reacted slurry, drying for 24h at 110 ℃, crushing and screening to obtain the short column-shaped micron-sized calcium carbonate.
The calcium carbonate prepared in this example was subjected to a scanning electron microscope test, and the test result is shown in fig. 2. As can be seen from FIG. 2, the calcium carbonate has a short column-shaped micron calcium carbonate structure, narrow particle size distribution, uniform particle size, regular appearance and good dispersibility.
Example 3
A preparation method of short-column-shaped micron calcium carbonate comprises the following steps:
s1 calcining limestone at 1100 deg.C for 10h to obtain quicklime, digesting at 60 deg.C with lime-water mass ratio of 1:6, and sieving with 100 mesh sieve to obtain Ca (OH)2Suspending liquid, adjusting the solid content of the suspending liquid to 5%, adding 2-methyl-2-ethylmalonic acid accounting for 2% of the dry weight of calcium carbonate, and aging for 24h to obtain refined lime milk;
s2, conveying the refined lime milk to a bubbling carbonization reaction kettle, controlling the carbonization temperature of the slurry to be 70 ℃, stirring at 400 r/min, introducing mixed gas with the carbon dioxide concentration of 15% to perform carbonation reaction until the pH value of the slurry is =11, adding a second crystal type with the calcium carbonate dry basis mass of 1% to control continuous carbonization until the pH value is less than or equal to 7, and stopping the reaction; the second crystal form is controlled by a mass ratio of 1:1:1, trihydroxy stearic acid glyceride, ethylene bis stearamide and glycerol trihydroxy methyl propane;
s3, dehydrating the reacted slurry, drying for 24h at 120 ℃, crushing and screening to obtain the short column-shaped micron-sized calcium carbonate.
The calcium carbonate prepared in this example was subjected to a scanning electron microscope test, and the test result is shown in fig. 3. As can be seen from FIG. 3, the calcium carbonate has a short column-shaped micron calcium carbonate structure, narrow particle size distribution, uniform particle size, regular appearance and good dispersibility.
Example 4
A preparation method of short-column-shaped micron calcium carbonate comprises the following steps:
s1 calcining limestone at 1200 deg.C for 7h to obtain quicklime, digesting at 50 deg.C according to lime-water mass ratio of 1:7, and sieving with 100 mesh sieve to obtain Ca (OH)2Suspending liquid, adjusting the solid content of the suspending liquid to 10%, adding 2-methylsuccinic acid with the weight of 1.5% of the dry weight of calcium carbonate, and aging for 48h to obtain refined lime milk;
s2, conveying the refined lime milk to a bubbling carbonization reaction kettle, controlling the carbonization temperature of the slurry to be 65 ℃, stirring at 300 r/min, introducing mixed gas with the carbon dioxide concentration of 13% to perform carbonation reaction until the pH value of the slurry is =10, adding a second crystal form with the calcium carbonate dry basis mass of 0.8% to control continuous carbonization until the pH value is less than or equal to 7, and stopping the reaction; the second crystal form is controlled by a mass ratio of 1:1:1, trihydroxy stearic acid glyceride, ethylene bis stearamide and glycerol trihydroxy methyl propane;
s3, dehydrating the reacted slurry, drying for 24h at 120 ℃, crushing and screening to obtain the short column-shaped micron-sized calcium carbonate.
The calcium carbonate prepared in this example was subjected to a scanning electron microscope test, and the test result is shown in fig. 4. As can be seen from FIG. 4, the calcium carbonate has a short column-shaped micron calcium carbonate structure, narrow particle size distribution, uniform particle size, regular appearance and good dispersibility.
Comparative example 1
A preparation method of short-column-shaped micron calcium carbonate comprises the following steps:
s1, calcining limestone at 1300 ℃ for 10 hours to obtain quicklime, carrying out digestion reaction at the temperature of water for digestion of 40 ℃ according to the mass ratio of lime to water of 1:8, sieving by a 100-mesh sieve to obtain Ca (OH)2 suspension, adjusting the solid content of the suspension to 5%, adding 2-methyl-2-ethylsuccinic acid accounting for 3% of the dry weight of calcium carbonate, and aging for 24 hours to obtain refined lime milk;
s2, conveying the refined lime milk to a bubbling carbonization reaction kettle, controlling the carbonization temperature of the slurry to be 50 ℃, stirring at 300 r/min, introducing mixed gas with the carbon dioxide concentration of 10% to carry out carbonation reaction until the pH value is less than or equal to 7, and stopping the reaction;
and S3, dehydrating the reacted slurry, drying for 24 hours at 110 ℃, crushing and screening to obtain the calcium carbonate product.
The calcium carbonate product prepared in the comparative example 1 is tested by a scanning electron microscope, and the test result is shown in fig. 5, and it can be seen from the figure that the calcium carbonate has a spindle-shaped micron calcium carbonate structure, wide particle size distribution, irregular morphology and poor dispersibility.
Comparative example 2
A preparation method of short-column-shaped micron calcium carbonate comprises the following steps:
s1, calcining limestone at 1000 ℃ for 5h to obtain quick lime, and mixing the quick lime with water at 80 ℃ according to a mass ratio of 1:5, carrying out digestion reaction, sieving by a 100-mesh sieve to obtain Ca (OH)2 suspension, adjusting the solid content of the suspension to 10%, adding 2-methyl-2-ethylsuccinic acid accounting for 3% of the dry weight of calcium carbonate, and aging for 72h to obtain refined lime milk;
s2, conveying the refined lime milk to a bubbling carbonization reaction kettle, controlling the carbonization temperature of the slurry to be 80 ℃, stirring at 500 r/min, introducing mixed gas with the carbon dioxide concentration of 20% to carry out carbonation reaction until the pH value is less than or equal to 7, and stopping the reaction;
s3, dehydrating the reacted slurry, drying for 24h at 120 ℃, crushing and screening to obtain the short column-shaped micron-sized calcium carbonate.
The calcium carbonate prepared in the comparative example was subjected to a scanning electron microscope test, and the test result is shown in fig. 6. As can be seen from FIG. 6, the calcium carbonate has a short column-shaped micron calcium carbonate structure, but has wide particle size distribution, uneven particle size, irregular shape, agglomeration phenomenon and poor dispersibility.
Comparative example 3
A preparation method of short-column-shaped micron calcium carbonate comprises the following steps:
s1, calcining limestone at 1000 ℃ for 5h to obtain quick lime, and mixing the quick lime with water at 80 ℃ according to a mass ratio of 1:5, carrying out digestion reaction, sieving by a 100-mesh sieve to obtain Ca (OH)2Suspending liquid, adjusting the solid content of the suspending liquid to 10%, adding 2-methyl-2-ethylsuccinic acid with 3% of the dry weight of calcium carbonate, and aging for 72h to obtain refined lime milk;
s2, conveying the refined lime milk to a bubbling carbonization reaction kettle, controlling the carbonization temperature of slurry to be 80 ℃, stirring at 500 r/min, introducing mixed gas with the carbon dioxide concentration of 20% to perform carbonation reaction until the pH value of the slurry is =10, adding trihydroxystearin with the calcium carbonate dry basis mass of 1.5% to continue carbonization until the pH value is less than or equal to 7, and stopping reaction;
s3, dehydrating the reacted slurry, drying for 24h at 120 ℃, crushing and screening to obtain the short column-shaped micron-sized calcium carbonate.
The calcium carbonate prepared in this example was subjected to a scanning electron microscope test, and the test result is shown in fig. 7. Fig. 7 shows that the calcium carbonate is short-column-shaped micron calcium carbonate, and compared with example 1, the calcium carbonate has the advantages of wide particle size distribution, uneven particle size, relatively irregular morphology and small agglomeration.
Comparative example 4
A preparation method of short-column-shaped micron calcium carbonate comprises the following steps:
s1, calcining limestone at 1000 ℃ for 5h to obtain quick lime, and mixing the quick lime with water at 80 ℃ according to a mass ratio of 1:5, carrying out digestion reaction, sieving by a 100-mesh sieve to obtain Ca (OH)2Suspending liquid, adjusting the solid content of the suspending liquid to 10%, adding 2-methyl-2-ethylsuccinic acid with 3% of the dry weight of calcium carbonate, and aging for 72h to obtain refined lime milk;
s2, conveying the refined lime milk to a bubbling carbonization reaction kettle, controlling the carbonization temperature of the slurry to be 80 ℃, controlling the stirring speed to be 500 r/min, introducing mixed gas with the carbon dioxide concentration of 20% to perform carbonation reaction until the pH value of the slurry is =10, adding a second crystal control agent with the calcium carbonate dry basis mass of 1.5% to continue carbonization until the pH value is less than or equal to 7, and stopping the reaction; the second crystal form control agent is prepared from the following components in a mass ratio of 1:1 ethylene bis stearamide and glycerol trihydroxy methyl propane;
s3, dehydrating the reacted slurry, drying for 24h at 120 ℃, crushing and screening to obtain the short column-shaped micron-sized calcium carbonate.
The calcium carbonate prepared in this example was subjected to a scanning electron microscope test, and the test result is shown in fig. 8. Fig. 8 shows that the calcium carbonate is short-column-shaped micron calcium carbonate, and compared with example 1, the calcium carbonate has the advantages of wide particle size distribution, uneven particle size, relatively irregular morphology and small agglomeration.
The foregoing is a more detailed description of the invention in connection with specific/preferred embodiments and is not intended to limit the practice of the invention to those descriptions. It will be apparent to those skilled in the art that various substitutions and modifications can be made to the described embodiments without departing from the spirit of the invention, and such substitutions and modifications are to be considered as within the scope of the invention.
Claims (8)
1. A preparation method of short-column-shaped micron calcium carbonate is characterized by comprising the following steps:
s1 calcining limestone to obtain calcium lime, digesting, reacting, and sieving to obtain Ca (OH)2Suspending liquid, adjusting the solid content of the suspending liquid to 5-10%, adding a first crystal form control agent, and aging for 24-72 hours to obtain refined lime milk; the first crystal form control agent comprises one or more of 2-methyl-2-ethylsuccinic acid, 2-methyl-2-ethylmalonic acid and 2-methylsuccinic acid;
s2, conveying the refined lime milk to a bubbling carbonization reaction kettle, introducing mixed gas containing carbon dioxide to carry out a carbonation reaction, adding a second crystal type to control continuous carbonization until the pH value of the slurry is less than or equal to 7 when the reaction is carried out until the pH value of the slurry is = 10-11, and stopping the reaction; the second crystal form control consists of trihydroxy stearic acid glyceride, ethylene bis stearamide and glycerol trihydroxy methyl propane;
and S3, dehydrating the reacted slurry, drying, crushing and screening to obtain the short column-shaped micron-sized calcium carbonate.
2. The method for preparing short columnar micron calcium carbonate according to claim 1, wherein: the addition amount of the crystal form control agent is 1-3% of the dry weight of calcium carbonate in the suspension.
3. The method of preparing short columnar micron calcium carbonate according to claim 2, wherein: the addition amount of the second crystal form control agent is 0.5-1.5% of the dry weight of the calcium carbonate.
4. The method of preparing short columnar micron calcium carbonate according to claim 3, wherein: the mass ratio of trihydroxy stearic acid glyceride, ethylene bis stearamide and glycerol trihydroxy methyl propane in the second crystal control agent is 1:1: 1.
5. The method for preparing short columnar micron calcium carbonate according to claim 1, wherein: the carbonation reaction is carried out at the temperature of 50-80 ℃, the stirring speed of 300-500 r/min and the carbon dioxide concentration of 10-20% in the mixed gas.
6. The method for preparing short columnar micron calcium carbonate according to claim 1, wherein: and step S1, calcining for 5-10 hours at the temperature of 1000-1300 ℃.
7. The method for preparing short columnar micron calcium carbonate according to claim 1, wherein: and step S1, the digestion reaction is carried out at 40-80 ℃ under the condition that the mass ratio of the quicklime to the water is 1: 5-8.
8. The method for preparing short columnar micron calcium carbonate according to claim 1, wherein: the drying is carried out at the temperature of 110-120 ℃.
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