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A method for preparing nanometer ellipsoidal calcium carbonate particles

A calcium carbonate and ellipsoid technology is applied in the field of preparation of nano-ellipsoid calcium carbonate particles to achieve the effects of reducing energy consumption, large surface area and lowering production costs

Inactive Publication Date: 2017-11-10
GUANGXI UNIV FOR NATITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no report on the preparation of nano-ellipsoidal calcium carbonate particles in non-aqueous solvents without crystal form control agents and surfactants.

Method used

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  • A method for preparing nanometer ellipsoidal calcium carbonate particles
  • A method for preparing nanometer ellipsoidal calcium carbonate particles
  • A method for preparing nanometer ellipsoidal calcium carbonate particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A kind of preparation method of nanometer ellipsoidal calcium carbonate particle, concrete processing step is as follows:

[0029] (1) Add 20 parts by mass of calcium oxide to 100 parts of a mixed solvent of ethanol and butanol with a mass ratio of 3.8:1, and stir to prepare Ca(OH) 2 suspension, and then cool the suspension to 10°C in an ice bath;

[0030] (2) The cooled Ca(OH) 2 The suspension is sent to the carbonization reactor. At room temperature, carbon dioxide is blown from the bottom of the carbonization reactor at a large flow rate of 200mL / min. When the pH=7, the CO2 injection is stopped. 2 , then transferred to a vacuum distiller, heated to 75°C, and the pressure was -1.3KPa, and the solvent was recovered to obtain nanometer calcium carbonate solid particles;

[0031] (3) The calcium carbonate solid particles are pulverized by conventional methods to obtain nano-elliptical calcium carbonate products.

[0032] The bulk density of the nano-ellipsoidal calciu...

Embodiment 2

[0034] A kind of preparation method of nanometer ellipsoidal calcium carbonate particle, concrete processing step is as follows:

[0035] (1) Add 20 parts by mass of calcium oxide to 200 parts of methanol and glycerol mixed solvent with a mass ratio of 2.5:1, and stir to prepare Ca(OH) 2 suspension, and then cool the suspension to 7°C in an ice bath;

[0036] (2) The cooled Ca(OH) 2 The suspension is sent to the carbonization reactor. At room temperature, carbon dioxide is blown from the bottom of the carbonization reactor at a large flow rate of 250mL / min. When the pH=7.5, the CO2 is stopped. 2 , then transferred to a stirred atmospheric distiller, stirring at a rotating speed of 70r / min, heating to 170°C, recovering the solvent, recovering the solvent, and obtaining nanometer calcium carbonate solid particles;

[0037] (3) The calcium carbonate solid particles are pulverized by conventional methods to obtain nano-elliptical calcium carbonate products.

[0038] The bulk de...

Embodiment 3

[0040] A kind of preparation method of nanometer ellipsoidal calcium carbonate particle, concrete processing step is as follows:

[0041](1) Add 20 parts by mass of calcium oxide to 150 parts of a mixed solvent of methanol and acetonitrile with a mass ratio of 3.5:1, and stir to prepare Ca(OH) 2 suspension, and then cool the suspension to 8°C in an ice bath;

[0042] (2) The cooled Ca(OH) 2 The suspension is sent to the carbonization reactor. At room temperature, carbon dioxide is blown from the bottom of the carbonization reactor at a large flow rate of 300mL / min. When the pH=7.2, the CO2 is stopped. 2 , then transferred to a stirred atmospheric distiller, stirred at a rotating speed of 100r / min, heated to 75°C, recovered the solvent, and obtained nanometer calcium carbonate solid particles;

[0043] (3) The calcium carbonate solid particles are pulverized by conventional methods to obtain nano-elliptical calcium carbonate products.

[0044] The bulk density of the nano-el...

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Abstract

A method for preparing nanometer ellipsoidal calcium carbonate particles is disclosed. The method includes dissolving calcium oxide into a non-water solvent to prepare a Ca(OH)2 suspension, cooling the suspension through an ice bath to 5-15 DEG C, conveying the cooled suspension to a carbonization reactor, bubbling carbon dioxide into the reactor from the bottom of the reactor at a high flow rate that is 200-400 mL / min without the need of heating until the pH is 7-7.5, transferring a product to a distiller, continuously stirring the product under atmospheric pressure or performing vacuum distillation to recover the solvent to obtain nanometer calcium carbonate solid particles, and crushing the calcium carbonate solid particles according to a conventional process to obtain a nanometer ellipsoidal calcium carbonate product. According to the preparing method, the nanometer ellipsoidal calcium carbonate particles are synthesized by adopting the calcium oxide and the carbon dioxide as raw materials in a non-water solvent system without the need of a crystal form controlling agent or a surfactant, application effects of calcium carbonate are improved, and a novel route for developing a novel use of calcium carbonate is provided.

Description

technical field [0001] The invention belongs to the technical field of inorganic powder preparation, in particular to a method for preparing nano-elliptical calcium carbonate particles. Background technique [0002] Calcium carbonate has been widely used in rubber, paper, paint, medicine, cosmetics and other industries and departments. Although different industries have different requirements on the morphology, mixed crystal particle size and surface properties of calcium carbonate, the synthesis of calcium carbonate materials with controllable morphology and structure is one of the hotspots of current research. With the help of various additives, the solution-synthesized The method can prepare calcium carbonate with controllable shape, size and structure. [0003] At present, there are a large number of literature reports on the preparation of calcium carbonate with spherical morphology, but they are generally limited to aqueous solution systems, and the morphology of calc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18B82Y40/00
CPCC01F11/184C01P2002/72C01P2004/03C01P2004/32C01P2004/62C01P2006/11C01P2006/12
Inventor 袁爱群王耀宣周泽广朱勇黄增尉韦冬萍马少妹熊文
Owner GUANGXI UNIV FOR NATITIES
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