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Preparation method of high-purity and high-activity nano calcium carbonate

A nano-calcium carbonate, high-activity technology, applied in the direction of calcium carbonate/strontium/barium, nanotechnology, nanotechnology, etc., can solve the problems of the purity and yield of nano-calcium carbonate products, the cumbersome process of impurity removal and purification, etc., to achieve Effects of reducing interaction, improving surface properties, and improving dispersibility

Inactive Publication Date: 2020-07-28
NANNING XIAYANG CHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But using Ca 2+ -H 2 O-CO 3 2- There are impurities such as sodium chloride or sodium nitrate in the preparation method of the reaction system, and the impurity removal and purification process is cumbersome, which has a negative impact on the purity and yield of nano-calcium carbonate products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A kind of preparation method of high-purity, highly active nano-calcium carbonate, it comprises the following steps:

[0021] (1) Stir and mix quicklime and water according to the ratio of quicklime to water mass ratio of 1:4, then add DTPA and continue to stir for 20 minutes to obtain lime slurry, then pass the lime slurry through a 160-mesh sieve to remove slag, and then adjust the lime The solid content of the slurry is 11% for subsequent use; the addition of the DTPA is 13% of the quicklime quality; the calcium oxide content in the quicklime is more than 95%, and the content of silicon dioxide is less than 2%; the stirring speed is 550r / min;

[0022] (2) According to the ratio of dissolving 2.8g melamine per 100ml deionized water, dissolve melamine with deionized water, then heat to 90°C constant temperature, add folic acid to react for 45min under the stirring speed of 250r / min, and naturally cool to 22°C Add calcium stearate and stir and mix again, obtain mixtur...

Embodiment 2

[0027] A kind of preparation method of high-purity, highly active nano-calcium carbonate, it comprises the following steps:

[0028] (1) Stir and mix quicklime and water according to the ratio of quicklime to water mass ratio of 1:3, then add DTPA and continue to stir for 15 minutes to obtain lime slurry, then pass the lime slurry through a 150-mesh sieve to remove slag, and then adjust the lime The solid content of the slurry is 10% for subsequent use; the addition of the DTPA is 10% of the quicklime quality; the calcium oxide content in the quicklime is more than 95%, and the content of silicon dioxide is less than 2%; the stirring speed is 500r / min;

[0029] (2) According to the ratio of dissolving 2g melamine per 100ml deionized water, dissolve melamine with deionized water, then heat to a constant temperature of 85°C, add folic acid to react for 30min while stirring at a speed of 200r / min, and cool naturally to 20°C Then add sodium stearate and stir to mix, obtain mixtu...

Embodiment 3

[0034] A kind of preparation method of high-purity, highly active nano-calcium carbonate, it comprises the following steps:

[0035] (1) Stir and mix quicklime and water according to the ratio of quicklime to water mass ratio of 1:5, then add DTPA and continue to stir for 30 minutes to obtain lime slurry, then pass the lime slurry through a 200-mesh sieve to remove slag, and then adjust the lime The solid content of the slurry is 12% for subsequent use; the addition of the DTPA is 15% of the quicklime quality; the calcium oxide content in the quicklime is more than 95%, and the content of silicon dioxide is less than 2%; the stirring speed is 600r / min;

[0036] (2) According to the ratio of dissolving 3g melamine per 100ml deionized water, dissolve melamine with deionized water, then heat to 95°C constant temperature, add folic acid to react for 50min while stirring at a speed of 300r / min, and cool naturally to 25°C Then add zinc stearate and stir to mix, obtain mixture A; T...

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Abstract

The invention discloses a preparation method of high-purity and high-activity nano calcium carbonate, which comprises the following steps: proportionally stirring and mixing quick lime and water to obtain lime slurry, screening the lime slurry with a 150-200-mesh sieve, and filtering to remove slag for later use; dissolving melamine with deionized water, heating the solution to 85-95 DEG C, keeping the temperature constant, adding folic acid under a stirring condition to react, naturally cooling the reaction product, adding stearate, and stirring and mixing all the components to obtain a mixture A; mixing lime slurry and the mixture A under a stirring condition to obtain a mixture B, then adding carbon dioxide into the mixture B to carry out a carbonization reaction, adding starch into themixed solution B at the same time with stirring and mixing, and then heating the mixture to 50-60 DEG C, keeping the temperature constant, stirring and mixing the mixture for 2-5 hours, filtering themixture, and carrying out vacuum drying to obtain the modified nano calcium carbonate. According to the method, the crystal form of the nano calcium carbonate product is conveniently improved and controlled, and the loose and porous nano calcium carbonate product with a large specific surface area is obtained.

Description

technical field [0001] The invention belongs to the technical field of calcium carbonate production, and in particular relates to a preparation method of high-purity and high-activity nano-calcium carbonate. Background technique [0002] Nano-calcium carbonate is a new type of ultra-fine solid powder material developed in the 1980s, with a particle size between 0.01 and 0.1 μm. Due to the ultra-fine size of nano-calcium carbonate particles, 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. At present, nano-calcium carbonate has been widely used in industries such as rubber, plastics, papermaking, chemical building materials, inks, coatings, sealants and adhesives. At present, nano-calcium carbonate mainly adopts liquid phase method, which can be divided into: Ca 2+ -R-CO 3 2- Reaction system (R is an organic medium...

Claims

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Application Information

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IPC IPC(8): C01F11/18B82Y30/00B82Y40/00
CPCC01F11/183C01F11/185B82Y30/00B82Y40/00C01P2006/80C01P2004/64C01P2006/12
Inventor 韦明
Owner NANNING XIAYANG CHEM TECH CO LTD
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