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A kind of preparation method of spherical micronano grade calcium carbonate

A micro-nano, calcium carbonate technology, applied in the direction of calcium carbonate/strontium/barium, chemical instruments and methods, calcium/strontium/barium compounds, etc., can solve problems such as shortage, achieve high degree of spherification, concentrated particle size distribution, cost reduction effect

Inactive Publication Date: 2019-03-26
GUANGXI UNIV FOR NATITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem that the present invention aims to solve is to overcome the defect in the prior art that lacks a simple and easy method for preparing spherical nano-calcium carbonate that does not use organic additives and has a high product sphericity, and provides a spherical micro-nano-scale The preparation method of calcium carbonate

Method used

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  • A kind of preparation method of spherical micronano grade calcium carbonate
  • A kind of preparation method of spherical micronano grade calcium carbonate
  • A kind of preparation method of spherical micronano grade calcium carbonate

Examples

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Embodiment 1

[0039] A preparation method for spherical micro-nano calcium carbonate, comprising the following steps:

[0040] (1) Dissolve ammonium carbonate in deionized water to prepare NH 4 + The concentration is 1.2mol / L, add 0.1g of the additive potassium hexacyanoferrate, stir with magnetic stirring at 300r / min to form solution A, the concentration of the additive in solution A is 1mg / L;

[0041] (2) Calcium chloride was dissolved in deionized water to prepare a solution with a concentration of 1 mol / L to form solution B.

[0042] (3) Use a peristaltic pump to drop solution A into solution B at a rate of 2661 ul / min, then continue to stir in solution B at 300 r / min, and react for 2 hours after the addition is complete. During the reaction, the reaction temperature was controlled at 30° C. with a cryostat.

[0043] (4) After the reaction is complete, the product obtained in step (3) is washed with water, suction filtered, and dried, wherein the drying temperature is 110°C. The dry...

Embodiment 2

[0047] A preparation method for spherical micro-nano calcium carbonate, comprising the following steps:

[0048] (1) Dissolve ammonium carbonate in deionized water to prepare NH 4 + The concentration of the solution is 2mol / L, adding 0.15g of sodium pyrophosphate as an additive, and stirring with a magnetic stirrer at 30r / min to form a solution A, and the concentration of the additive in solution A is 1.5mg / L.

[0049] (2) Calcium chloride is dissolved in deionized water to prepare Ca2+ A solution with a concentration of 1 mol / L forms solution B.

[0050] (3) Add solution A dropwise to solution B at a rate of 2664ul / min with a peristaltic pump, then continue to stir in solution B at 300r / min, and react for 1.5 hours after the addition is complete. During the reaction, the reaction temperature was controlled at 30° C. with a cryostat.

[0051] (4) After the reaction is complete, the product obtained in step (3) is washed with water, suction filtered, and dried, wherein the d...

Embodiment 3

[0055] A preparation method for spherical micro-nano calcium carbonate, comprising the following steps:

[0056] (1) Dissolve ammonium carbonate in deionized water to prepare NH 4 + The concentration of the solution is 1.5 mol / L, add 0.15 g of sodium trimetaphosphate as an additive, and stir at 300 r / min with a magnetic stirrer to form a solution A. The additive concentration in solution A is 1.5mg / L.

[0057] (2) Calcium chloride is dissolved in deionized water to prepare Ca 2+ A solution with a concentration of 1.5 mol / L forms solution B.

[0058] (3) Add solution A dropwise to solution B at a rate of 2668ul / min with a peristaltic pump, then continue to stir in solution B at 300r / min, and react for 2 hours after the addition is complete. During the reaction, the reaction temperature was controlled at 30° C. with a cryostat.

[0059] (4) After the reaction is complete, the product obtained in step (3) is washed with water, suction filtered, and dried, wherein the drying ...

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Abstract

The invention discloses a preparation method of spherical micro-nano calcium carbonate. The preparation method comprises the following steps of (1) preparing an ammonium carbonate-additive solution or ammonium bicarbonate-additive solution, wherein the concentration of NH4<+> is 0.5 to 4mol / L, the concentration of an additive is 1 to 2mg / L, and the additive is selected from potassium ferricyanide, L-glutamic acid, polyvinylpyrrolidone, beta-cyclodextrin, sodium polyphosphate, pentaerythritol, sodium pyrophosphate, monosodium phosphate, sodium phosphate, sodium hexametaphosphate, sodium trimetaphosphate or sodium tetraborate; (2) preparing a calcium salt solution, wherein the concentration of Ca<2+> is 1 to 3mol / L; (3) dripping the solution in step (1) into the calcium salt solution at the rate of 2000 to 4000ul / min, reacting for 1 to 4h at the temperature of 20 to 50 DEG C, and stirring at the rate of 200 to 400r / min during dripping and reaction; (4) washing, sucking and filtering, and drying; (5) fetching out a filter cake, and uniformly crushing. The preparation method has the advantages that the technology is simple, the implementing is easy, and the environment-friendly and pollution-free effects of materials are realized.

Description

technical field [0001] The invention relates to a method for preparing spherical micro-nano calcium carbonate. Background technique [0002] Calcium carbonate is widely used in various chemical industries as a filler. However, due to the ultra-fine particle size of nano-scale calcium carbonate, its crystal structure and surface electronic structure change, resulting in quantum size effect, small size effect, surface effect and macroscopic quantum effect that ordinary calcium carbonate does not have. Compared with conventional materials, it shows superior performance in terms of catalyst, photothermal resistance and melting point. It is also widely used. In plastics, it can improve the dimensional stability, hardness and rigidity of plastic products, improve the rheological properties of plastics, and improve the heat resistance of plastic products. The ink added with nano-calcium carbonate is comparable to traditional ink fillers. Ratio, showing excellent dispersibility, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18
CPCC01F11/182C01P2004/03C01P2004/32C01P2004/60C01P2004/61C01P2004/62
Inventor 蓝平关欣张金彦廖安平蓝丽红李媚卢彦越黄泽晓黄宏就黄宝英
Owner GUANGXI UNIV FOR NATITIES
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