CN112723402A - Preparation method of monodisperse spindle-shaped precipitated calcium carbonate - Google Patents
Preparation method of monodisperse spindle-shaped precipitated calcium carbonate Download PDFInfo
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Abstract
The invention discloses a preparation method of monodisperse spindle-shaped precipitated calcium carbonate, which comprises the steps of calcining ores at 850-1000 ℃ to generate quicklime, performing digestion reaction to obtain Ca (OH)2 lime milk, standing, sieving, and adjusting the solid content of the lime milk to 8-10 wt%; preheating the lime milk to 50-80 ℃, conveying the lime milk to a carbonization tower, adding a crystal form control agent and a dispersing agent, introducing carbon dioxide mixed gas, and carrying out carbonation reaction under high-speed stirring, wherein the crystal form control agent is prepared by compounding polyacrylamide and saccharides; the dispersing agent consists of polyethylene glycol and sodium hexametaphosphate; filtering, drying and crushing the calcium carbonate slurry to obtain the spindle-shaped micron calcium carbonate. The spindle-shaped micron calcium carbonate prepared by the method has the advantages of regular shape, good dispersibility, small particle size, narrow particle size distribution, small specific surface area and the like, is simple in preparation process, is easy to realize industrial production, and has good application prospect.
Description
Technical Field
The invention belongs to the technical field of inorganic material preparation, and particularly relates to a preparation method of monodisperse spindle-shaped precipitated calcium carbonate.
Background
The precipitated calcium carbonate has the advantages of low price, easy production, wide sources, no toxicity and the like, and is widely applied to the fields of rubber, papermaking, coating, printing ink, cables, building materials, adhesives, sealants and the like as an important industrial filler. The main preparation methods of precipitated calcium carbonate are two methods, namely a bubbling carbonization method and a double decomposition method, wherein the bubbling carbonization method is commonly used for industrial production, and the double decomposition method is mainly used for mechanism research in laboratories. Precipitated calcium carbonate can be classified into calcite, aragonite, and vaterite according to their crystalline structure. The precipitated calcium carbonate can be in a spindle shape, a needle shape, a rod shape, a cluster shape, a flake shape, a cubic shape, a rice grain shape and the like according to common morphological characteristics. The spindle-shaped calcium carbonate has the characteristics of easy dispersion, good processing performance, high semi-reinforcement and the like, and is widely applied to the fields of rubber, plastic and other polymer processing and the like. In addition, the spindle-shaped light calcium carbonate is also widely noticed and applied in paper making industries such as paper coating, cigarette paper and the like, can greatly improve the surface gloss of paper when being used as a coating pigment of the paper, and can improve the air permeability of the cigarette paper when being used as a filler of the cigarette paper. Meanwhile, the fusiform light calcium carbonate pointed cone structure can effectively improve the retention rate of other coatings of paper, and avoid the problems of transparency increase, strength reduction and the like after the paper is calendered.
Chinese patent CN 102583483B discloses a preparation method of micron spindle composite nano calcium carbonate, which is mainly characterized in that firstly, 10-20% of calcium hydroxide suspension is placed in an environment of 38-42 ℃ and 28-35% of carbon dioxide mixed gas is introduced for carbonization to obtain calcium carbonate suspension, then the calcium carbonate suspension is transferred into an aging tank to be aged for 24 hours by introducing carbon dioxide, and finally calcium hydroxide is supplemented for continuous carbonization, wherein 0.5-1.2% of crystal form control agent is added in the secondary carbonization, wherein the crystal form control agent is one of sucrose, sulfuric acid or sulfate. The preparation process of the invention is complex in process, and in addition, the use amount of carbon dioxide is too high, so that the industrial production control is not easy to realize, and the production cost is increased. The method does not meet the low cost requirement of industrial production, and the crystal form control agent is added in too much amount and does not meet the requirement of industrial production.
Chinese patent CN 107792872B discloses a process for preparing spindle-shaped nano calcium carbonate, which is mainly characterized in that a secondary carbonization tower is used for carbonization in the carbonization process, and the carbonization process comprises the following steps of performing high activity carbonizationMixing and digesting quicklime and slaking water according to the mass ratio of 1:5, sieving to obtain lime milk, adjusting the concentration of the lime milk to 6-8 Baume degrees under the condition of 20-25 ℃, and then adding a dry matrix Ca (OH)20.8-1.2% of crystal form control agent A industrial white sugar and crystal form control agent B polyphosphate by mass to obtain initial slurry. Then pumping the initial slurry into a first-stage carbonization tower, and introducing carbon dioxide to carbonize until the pH value of the slurry reaches 9. And standing and aging the slurry in the first-stage carbonization tower for 72h, pumping the slurry into a second-stage carbonization tower, continuously carbonizing until the pH value of the slurry reaches 6.8-7, and stopping carbonization to obtain reaction slurry. The process of the invention has the disadvantages of too long time consumption, too many types and quantities of added crystal form control agents and high process cost, thus being not beneficial to industrial production.
Japanese patent JP2000086237A provides a method for preparing small particle size spindle-shaped calcium carbonate, which is characterized in that soluble zinc salt is added into lime milk, wherein the soluble zinc salt referred to in the patent comprises zinc chloride, zinc sulfate, zinc nitrate and the like. The patent indicates that the grain diameter of the product is mainly controlled by the addition amount of the additive, and the addition amount of the metal zinc element is 0.01-5% of the mass of the calcium hydroxide. When the addition amount is too low, the control of morphology and particle size cannot be achieved, and the product agglomeration is serious due to the excessively high addition amount, so that the method is not suitable for practical application.
The patent WO0149610A1 provides a preparation method of spindle-shaped calcium carbonate, which is characterized in that before carbonization or before the carbonization rate reaches 20%, carbonate solution with the molar ratio of 0.01-1% of calcium hydroxide is added into lime milk, and the dropping time is 30-60 min. The method needs strict control of the dropping time of the carbonate, has harsh conditions and is not suitable for expanded production.
Patent CN97180466.4 provides a method for preparing calcium carbonate for use as a paper filler or coating pigment for coated paper in the causticizing step of a sulfate or alkaline pulping process, characterized in that it comprises the steps of: in a first step, in quicklime, (a) white liquor is added to a concentration of said quicklime of 0.5 to 60% by weight based on the weight of quicklime before digestion, wherein said quicklime is produced in said causticizing step and/or is introduced from outside the step and contains 0.1 to 10% by weight of calcium carbonate based on the weight of quicklime; or (b) adding green liquor to a concentration of the quicklime of 20 to 60% by weight based on the weight of the quicklime before digestion and digesting the quicklime with stirring or kneading to obtain milk of lime and/or slurry of lime, and then in a second step, subjecting the milk of lime and/or slurry of lime to a causticization reaction at a reaction temperature of 20 to 105 ℃ by continuously adding the amount of green liquor required for preparing white liquor produced in the causticization step at a feed rate of 0.02 to 0.5cc (green liquor)/min/g (quicklime). The method is limited in the papermaking industry and is not suitable for the development of calcium carbonate in various industries.
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 provides a preparation method of monodisperse spindle-shaped precipitated calcium carbonate, aiming at the problems that the existing spindle-shaped micron carbon is easy to cluster, irregular in appearance and wide in particle size distribution. The spindle-shaped micron calcium carbonate prepared by the method has the advantages of regular appearance, good dispersity, small particle size, narrow particle size distribution and smaller specific surface area.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a preparation method of monodisperse spindle-shaped precipitated calcium carbonate comprises the following steps:
(1) calcining the ore at 850-1000 ℃ to generate quicklime, performing digestion reaction to obtain Ca (OH)2 lime milk, standing, sieving, and adjusting the solid content of the lime milk to 8-10 wt%;
(2) preheating the lime milk to 50-80 ℃, conveying the lime milk to a carbonization tower, adding a crystal form control agent and a dispersing agent, introducing carbon dioxide mixed gas, carrying out carbonation reaction under high-speed stirring, and stopping the reaction when the pH value of the slurry is 7-7.5; the crystal form control agent is prepared by compounding polyacrylamide and saccharides; the dispersing agent consists of polyethylene glycol and sodium hexametaphosphate;
(3) filtering, drying and crushing the calcium carbonate slurry to obtain the spindle-shaped micron calcium carbonate.
Further, the addition amount of the crystal form control agent is 0.05-0.1% of the mass of the quicklime.
Further, the saccharide is one or more of fructose, glucose, maltose, trehalose, lactose and sucrose.
Further, the mass ratio of the polyacrylamide to the saccharides is 1-3: 3-5.
Furthermore, the addition amount of the dispersant is 0.5-2.0% of the mass of the quicklime.
Further, the mass ratio of polyethylene glycol to sodium hexametaphosphate in the dispersing agent is 3-5: 1-3.
Further, the high-speed stirring is carried out at the rotation speed of 900-1200 rpm/min.
Further, the volume concentration of carbon dioxide in the mixed gas is 10-20%, and the volume flow is 1-4m3/h。
Further, the drying is oven forced air drying; the drying temperature is 60-90 ℃, and the drying time is 18-24 h.
In order to ensure the monodisperse spindle-shaped micron calcium carbonate, the invention is realized based on the following principle: 1. carbonation is carried out using lime slurries with a lower degree of supersaturation (low solids content) with the aim of: (a) the calcium carbonate can reduce the influence of impurities entering the crystal to the uniform growth of the crystal in the crystallization process; (b) the supersaturation degree difference of each crystal face of calcium carbonate in the crystallization process is reduced, and the crystal growth sequence is prevented from being damaged to further influence the integrity of the crystal structure; (c) the viscosity of the lime slurry is reduced to ensure the uniformity of the reaction temperature and avoid the secondary nucleation from damaging the uniformity of the crystals. 2. Polyacrylamide and saccharides were used as crystal form control agents for the purpose of: (a) by saccharide hydroxy with Ca2+The activation energy of the calcium carbonate crystallization process is reduced through electrostatic adsorption, the existence of small crystal nuclei is stabilized, and the aggregation and growth of the crystal nuclei are inhibited; (b) adding polyacrylamide to improve dispersibility and inhibition between particlesThe crystal nucleus is gathered and grown, so that the crystal form control agent can be interlaced and coated on the surface of calcium carbonate in the process of forming calcium carbonate by carbonization, and the crystal form appearance is regular and stable. 3. High rotational speeds are used, with the aim of: the materials are uniformly distributed, the difference of local saturation is reduced, and the crystal is ensured to grow as nucleus in the same time as far as possible. 4. A lower carbon dioxide concentration is used for the purpose of: the supersaturation degree of carbonate ions in a reaction system is reduced, the generation number of crystal nuclei is reduced, and the growth of twin crystal nuclei is prevented from damaging the integrity of spindle crystallization. 5. Polyethylene glycol and sodium hexametaphosphate are used as dispersing agents, so that the dispersibility among particles is improved, and the processability of calcium carbonate is improved.
Compared with the prior art, the invention has the advantages and beneficial effects that:
the spindle-shaped micron calcium carbonate prepared by the method has the advantages of regular shape, good dispersibility, small particle size, narrow particle size distribution, small specific surface area and the like, is simple in preparation process, is easy to realize industrial production, and has good application prospect.
Drawings
FIG. 1 is a 30000 SEM photograph of monodisperse micron calcium carbonate of example 1;
FIG. 2 is a 30000 SEM photograph of monodisperse micron calcium carbonate of example 2;
FIG. 3 is a 10000 SEM photograph of monodisperse micron calcium carbonate of example 1;
FIG. 4 is a 10000 SEM photograph of monodisperse micron calcium carbonate of example 2;
FIG. 5 is a 5000 SEM photograph of monodisperse micron calcium carbonate of example 1;
fig. 6 is a 5000 x SEM photograph of monodisperse micron calcium carbonate of example 2.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments. It should be emphasized that the following description is merely exemplary in nature and is not intended to limit the scope of the invention or its application.
Example 1
A preparation method of monodisperse spindle-shaped precipitated calcium carbonate comprises the following steps:
(1) calcining the ore at 950 ℃ for 3 hours to generate quicklime, carrying out digestion reaction on the quicklime and water according to the mass ratio of 2:11 to obtain Ca (OH)2 lime milk, standing, sieving, and adjusting the solid content of the lime milk to 9.5 wt%;
(2) preheating the lime milk to 60 ℃, conveying the lime milk to a carbonization tower, adding a crystal form control agent accounting for 0.075 percent of the mass of the quicklime and a dispersing agent accounting for 1.2 percent of the mass of the quicklime, introducing carbon dioxide mixed gas with the volume content of 18 percent, and controlling the volume flow to be 2.0m3Performing carbonation reaction under high-speed stirring at 900 rpm/min, stopping the reaction when the pH value of the slurry reaches 7.5, and compounding the crystal form control agent with polyacrylamide and trehalose in a mass ratio of 2: 3; the dispersing agent consists of polyethylene glycol and sodium hexametaphosphate in a mass ratio of 3: 1;
(3) filtering the calcium carbonate slurry, drying by blowing in an oven at 70 ℃ for 20 h, and crushing to obtain spindle-shaped micron calcium carbonate.
The calcium carbonate prepared by the embodiment is detected by a scanning electron microscope, and the detection result is shown in fig. 1, 3 and 5, and it can be seen from the figure that the calcium carbonate prepared by the embodiment is spindle-shaped, has regular morphology and good dispersion degree.
Example 2
A preparation method of monodisperse spindle-shaped precipitated calcium carbonate comprises the following steps:
(1) calcining the ore at 900 ℃ for 4 hours to generate quicklime, carrying out digestion reaction on the quicklime and water according to the mass ratio of 2:11 to obtain Ca (OH)2 lime milk, standing, sieving, and adjusting the solid content of the lime milk to 8.5 wt%;
(2) preheating the lime milk to 70 ℃, conveying the lime milk to a carbonization tower, adding a crystal form control agent accounting for 0.09 percent of the mass of the quicklime and a dispersing agent accounting for 1.0 percent of the mass of the quicklime, introducing carbon dioxide mixed gas accounting for 15 percent of the volume content, and enabling the volume flow to be 3.0m3Performing carbonation reaction under high-speed stirring at 1200 rpm/min, stopping the reaction when the pH value of the slurry reaches 7.5, and compounding the crystal form control agent with polyacrylamide and maltose according to the mass ratio of 1: 4; the dispersing agent consists of polyethylene glycol and sodium hexametaphosphate in a mass ratio of 4: 1;
(3) filtering the calcium carbonate slurry, drying by blowing in an oven at 80 ℃ for 18h, and crushing to obtain spindle-shaped micron calcium carbonate.
The calcium carbonate prepared by the embodiment is detected by a scanning electron microscope, and the detection result is shown in fig. 2, 4 and 6, and it can be seen from the figure that the calcium carbonate prepared by the embodiment is spindle-shaped, has regular appearance and good dispersion degree.
Example 3
A preparation method of monodisperse spindle-shaped precipitated calcium carbonate comprises the following steps:
(1) calcining the ore at 1000 ℃ for 2.5h to generate quicklime, and carrying out digestion reaction on the quicklime and water according to the mass ratio of 2:11 to obtain Ca (OH)2Standing lime milk, sieving, and adjusting the solid content of the lime milk to 9.0 wt%;
(2) preheating the lime milk to 60 ℃, conveying the lime milk to a carbonization tower, adding a crystal form control agent accounting for 0.1 percent of the mass of the quicklime and a dispersing agent accounting for 0.8 percent of the mass of the quicklime, introducing carbon dioxide mixed gas with the volume content of 13 percent, and controlling the volume flow to be 3.0m3Performing carbonation reaction under high-speed stirring at 1000 rpm/min, stopping the reaction when the pH value of the slurry reaches 7.5, and compounding the polyacrylamide and sucrose in a mass ratio of 1:3 to form the crystal form control agent; the dispersing agent consists of polyethylene glycol and sodium hexametaphosphate in a mass ratio of 5: 1;
(3) filtering the calcium carbonate slurry, drying by blowing in an oven at 90 ℃ for 18h, and crushing to obtain spindle-shaped micron calcium carbonate.
Example 4
A preparation method of monodisperse spindle-shaped precipitated calcium carbonate comprises the following steps:
(1) calcining the ore at 1000 ℃ for 2.5h to generate quicklime, carrying out digestion reaction on the quicklime and water according to the mass ratio of 2:11 to obtain Ca (OH)2 lime milk, standing, sieving, and adjusting the solid content of the lime milk to 9.0 wt%;
(2) preheating the lime milk to 60 ℃, conveying the lime milk to a carbonization tower, adding a crystal form control agent accounting for 0.1 percent of the mass of the quicklime and a dispersing agent accounting for 0.8 percent of the mass of the quicklime, and introducing carbon dioxide accounting for 10 percent of the volume contentMixed gas with volume flow of 2.0m3Performing carbonation reaction under high-speed stirring at 1000 rpm/min, stopping the reaction when the pH value of the slurry reaches 7.5, and compounding the polyacrylamide and sucrose in a mass ratio of 1:3 to form the crystal form control agent; the dispersing agent consists of polyethylene glycol and sodium hexametaphosphate in a mass ratio of 5: 1;
(3) filtering the calcium carbonate slurry, drying by blowing in an oven at 90 ℃ for 18h, and crushing to obtain spindle-shaped micron calcium carbonate.
Comparative example 1
A preparation method of monodisperse spindle-shaped precipitated calcium carbonate comprises the following steps:
(1) calcining the ore at 950 ℃ for 3 hours to generate quicklime, carrying out digestion reaction on the quicklime and water according to the mass ratio of 2:11 to obtain Ca (OH)2 lime milk, standing, sieving, and adjusting the solid content of the lime milk to 15 wt%;
(2) preheating the lime milk to 60 ℃, then conveying the lime milk to a carbonization tower, adding a crystal form control agent accounting for 0.075% of the mass of the quicklime and a dispersing agent accounting for 1.2%, introducing a carbon dioxide mixed gas accounting for 33% of the volume content, carrying out carbonation reaction under high-speed stirring at 150 rpm/min, stopping the reaction when the pH value of slurry reaches 7.5, wherein the crystal form control agent is prepared by compounding polyacrylamide and trehalose in a mass ratio of 2: 3; the dispersing agent consists of polyethylene glycol and sodium hexametaphosphate in a mass ratio of 3: 1;
(3) and filtering the calcium carbonate slurry, drying by blowing in an oven at the drying temperature of 70 ℃ for 20 h, and crushing to obtain the calcium carbonate.
Comparative example 2
A preparation method of monodisperse spindle-shaped precipitated calcium carbonate comprises the following steps:
(1) calcining the ore at 950 ℃ for 3 hours to generate quicklime, carrying out digestion reaction on the quicklime and water according to the mass ratio of 2:11 to obtain Ca (OH)2 lime milk, standing, sieving, and adjusting the solid content of the lime milk to 9.5 wt%;
(2) preheating the lime milk to 60 ℃, conveying the lime milk to a carbonization tower, and adding trehalose crystal form control with the mass of 0.075 percent of quicklime1.2 percent of dispersant, and carbon dioxide mixed gas with the volume content of 18 percent is introduced, and the volume flow is 2.0m3Performing carbonation reaction under high-speed stirring at 900 rpm/min, and stopping reaction when the pH value of the slurry reaches 7.5; the dispersing agent consists of polyethylene glycol and sodium hexametaphosphate in a mass ratio of 3: 1;
(3) and filtering the calcium carbonate slurry, drying by blowing in an oven at the drying temperature of 70 ℃ for 20 h, and crushing to obtain the calcium carbonate.
Comparative example 3
A preparation method of monodisperse spindle-shaped precipitated calcium carbonate comprises the following steps:
(1) calcining the ore at 950 ℃ for 3 hours to generate quicklime, carrying out digestion reaction on the quicklime and water according to the mass ratio of 2:11 to obtain Ca (OH)2 lime milk, standing, sieving, and adjusting the solid content of the lime milk to 9.5 wt%;
(2) preheating the lime milk to 60 ℃, conveying the lime milk to a carbonization tower, adding a polyacrylamide crystal form control agent accounting for 0.075 percent of the mass of the quicklime and a dispersing agent accounting for 1.2 percent of the mass of the quicklime, introducing carbon dioxide mixed gas with the volume content of 18 percent, and controlling the volume flow to be 2.0m3Performing carbonation reaction under high-speed stirring at 900 rpm/min, and stopping reaction when the pH value of the slurry reaches 7.5; the dispersing agent consists of polyethylene glycol and sodium hexametaphosphate in a mass ratio of 3: 1;
(3) and filtering the calcium carbonate slurry, drying by blowing in an oven at the drying temperature of 70 ℃ for 20 h, and crushing to obtain the calcium carbonate.
Comparative example 4
A preparation method of monodisperse spindle-shaped precipitated calcium carbonate comprises the following steps:
(1) calcining the ore at 950 ℃ for 3 hours to generate quicklime, carrying out digestion reaction on the quicklime and water according to the mass ratio of 2:11 to obtain Ca (OH)2 lime milk, standing, sieving, and adjusting the solid content of the lime milk to 9.5 wt%;
(2) preheating the lime milk to 60 ℃, conveying the lime milk to a carbonization tower, adding a crystal form control agent accounting for 0.075 percent of the mass of the quicklime and a polyethylene glycol dispersant accounting for 1.2 percent of the mass of the quicklime, and introducing dioxide accounting for 18 percent of the volume contentCarbon mixed gas with volume flow of 2.0m3Performing carbonation reaction under high-speed stirring at 900 rpm/min, stopping the reaction when the pH value of the slurry reaches 7.5, and compounding the crystal form control agent with polyacrylamide and trehalose in a mass ratio of 2: 3;
(3) and filtering the calcium carbonate slurry, drying by blowing in an oven at the drying temperature of 70 ℃ for 20 h, and crushing to obtain the calcium carbonate.
Comparative example 5
A preparation method of monodisperse spindle-shaped precipitated calcium carbonate comprises the following steps:
(1) calcining the ore at 950 ℃ for 3 hours to generate quicklime, carrying out digestion reaction on the quicklime and water according to the mass ratio of 2:11 to obtain Ca (OH)2 lime milk, standing, sieving, and adjusting the solid content of the lime milk to 9.5 wt%;
(2) preheating the lime milk to 60 ℃, conveying the lime milk to a carbonization tower, adding a crystal form control agent accounting for 0.075% of the mass of the quicklime and a sodium hexametaphosphate dispersant accounting for 1.2%, introducing carbon dioxide mixed gas accounting for 18% of the volume, wherein the volume flow rate is 2.0m3/h, carrying out carbonation reaction under high-speed stirring at 900 rpm/min, stopping the reaction when the pH value of slurry reaches 7.5, and compounding polyacrylamide and trehalose according to the mass ratio of 2:3 to form the crystal form control agent;
(3) and filtering the calcium carbonate slurry, drying by blowing in an oven at the drying temperature of 70 ℃ for 20 h, and crushing to obtain the calcium carbonate.
The calcium carbonates prepared in examples 1 to 4 of the present invention and comparative examples 1 to 5 were subjected to a product performance test according to a conventional method, and the test results are shown in table 1.
Table 1: performance test results of calcium carbonate prepared by the invention
| Product(s) | D50（μm） | D97（μm） | BET（m2/g） |
| Example 1 | 2.772 | 6.133 | 4.1687 |
| Example 2 | 2.714 | 6.067 | 4.9053 |
| Example 3 | 2.617 | 6.573 | 5.4092 |
| Example 4 | 2.703 | 6.459 | 4.1060 |
| Comparative example 1 | 4.169 | 9.167 | 10.3473 |
| Comparative example 2 | 3.579 | 8.716 | 9.1692 |
| Comparative example 3 | 4.219 | 9.125 | 7.164 |
| Comparative example 4 | 2.918 | 8.173 | 8.169 |
| Comparative example 5 | 3.182 | 9.020 | 8.764 |
From the test results, the calcium carbonate product prepared by the method has the advantages of micron-level particle size range, small particle size, narrow particle size distribution and small specific surface area; as can be seen from comparative example 1, the prepared calcium carbonate products also have great differences by changing the preparation process conditions of the calcium carbonate; compared with the comparative examples 2 and 3, after the crystal form control agent is changed, the particle size is enlarged, the distribution is wider and not uniform enough, and the specific surface area is increased; comparing 4 and 5, the change of the dispersant not only changes the specific surface area of the calcium carbonate, but also has certain influence on the particle size, further showing that the dispersant can inhibit the agglomeration among the particles.
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 (9)
1. A preparation method of monodisperse spindle-shaped precipitated calcium carbonate is characterized by comprising the following steps: the method comprises the following steps:
(1) calcining the ore at 850-1000 ℃ to generate quicklime, performing digestion reaction to obtain Ca (OH)2 lime milk, standing, sieving, and adjusting the solid content of the lime milk to 8-10 wt%;
(2) preheating the lime milk to 50-80 ℃, conveying the lime milk to a carbonization tower, adding a crystal form control agent and a dispersing agent, introducing carbon dioxide mixed gas, carrying out carbonation reaction under high-speed stirring, and stopping the reaction when the pH value of the slurry is 7-7.5; the crystal form control agent is prepared by compounding polyacrylamide and saccharides; the dispersing agent consists of polyethylene glycol and sodium hexametaphosphate;
(3) filtering, drying and crushing the calcium carbonate slurry to obtain the spindle-shaped micron calcium carbonate.
2. The method of preparing monodisperse spindle-shaped precipitated calcium carbonate according to claim 1, characterized in that: the addition amount of the crystal form control agent is 0.05-0.1% of the mass of the quicklime.
3. The method of preparing monodisperse spindle-shaped precipitated calcium carbonate according to claim 1, characterized in that: the saccharide is one or more of fructose, glucose, maltose, trehalose, lactose and sucrose.
4. The method of preparing monodisperse spindle-shaped precipitated calcium carbonate according to claim 3, characterized in that: the mass ratio of the polyacrylamide to the saccharides is 1-3: 3-5.
5. The method of preparing monodisperse spindle-shaped precipitated calcium carbonate according to claim 1, characterized in that: the addition amount of the dispersant is 0.5-2.0% of the mass of the quicklime.
6. The method of preparing monodisperse spindle-shaped precipitated calcium carbonate according to claim 5, characterized in that: the mass ratio of polyethylene glycol to sodium hexametaphosphate in the dispersant is 3-5: 1-3.
7. The method of preparing monodisperse spindle-shaped precipitated calcium carbonate according to claim 1, characterized in that: the high-speed stirring is carried out at the rotating speed of 900-1200 rpm/min.
8. The method of preparing monodisperse spindle-shaped precipitated calcium carbonate according to claim 1, characterized in that: the volume concentration of carbon dioxide in the mixed gas is 10-20%, and the volume flow is 1-4m3/h。
9. The method of preparing monodisperse spindle-shaped precipitated calcium carbonate according to claim 1, characterized in that: the drying is drying by blast of an oven; the drying temperature is 60-90 ℃, and the drying time is 18-24 h.
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