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A kind of preparation technology of spherical nano-calcium carbonate

A nano-calcium carbonate and preparation technology, applied in the direction of calcium carbonate/strontium/barium, nanotechnology, calcium/strontium/barium compounds, etc., can solve the problems of low production efficiency, wide particle size distribution, and poor uniformity of nano-calcium carbonate , to achieve the effect of uniform size, shortened reaction time and high production efficiency

Active Publication Date: 2019-07-30
李岳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a preparation process of spherical nano-calcium carbonate to solve the problems of low production efficiency, large particle size, wide particle size distribution and poor uniformity in the preparation of nano-calcium carbonate by intermittent bubbling

Method used

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  • A kind of preparation technology of spherical nano-calcium carbonate
  • A kind of preparation technology of spherical nano-calcium carbonate
  • A kind of preparation technology of spherical nano-calcium carbonate

Examples

Experimental program
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Effect test

Embodiment 1

[0023] (1) Place weighed 60kg of quicklime with an activity of 360mL on the feeding platform of the digester; raise the temperature of 420kg of water to 60°C as digested water; turn on the digester; add digested water to 2% of the effective digestion volume of the digester / 3, add water and quicklime to the remaining water, gradually add to the digester, digest for about 10 minutes, pass through a suspension separator and a 240-mesh circular vibrating sieve to obtain refined milk of lime.

[0024] (2) Adjust the concentration of milk of lime to 8 degrees Baume, and then add the contained CaCO 3 1% industrial white sugar on a dry basis was used as a crystal form control agent to obtain a carbonized initial slurry.

[0025] (3) Put the initial carbonization slurry into an atmospheric jacketed glass reactor, the initial carbonization temperature is 20°C / 25°C / 30°C / 35°C, and the carbonization process is controlled to a maximum of 40°C, The stirring speed is 900r / min, the flow rate...

Embodiment 2

[0031] (1) Place weighed 60kg of quicklime with an activity of 360mL on the feeding platform of the digester; raise the temperature of 420kg of water to 50°C / 60°C / 70°C as digested water; turn on the digester; add the digested water to the digester 2 / 3 of the effective digestion volume of the digester, add the remaining water while adding quicklime, and gradually add it into the digester, digest for about 10 minutes, pass through the suspension separator and 240-mesh circular vibrating sieve to obtain refined lime milk;

[0032] (2) Adjust the concentration of lime milk to 8 Baume degrees, and then add CaCO contained in lime milk 3 1% crystal form control agent (industrial white sugar) of dry mass to obtain carbonized initial slurry;

[0033] (3) Put the initial carbonization slurry into an atmospheric jacketed glass reactor, adjust the initial carbonization temperature to 25°C, the maximum temperature shall not exceed 35°C, the stirring speed is 900r / min, and the flow rate of...

Embodiment 3

[0039] (1) Place weighed 60kg of quicklime with an activity of 360mL on the feeding platform of the digester; raise the temperature of 420kg of water to 60°C as digested water; turn on the digester; add digested water to 2% of the effective digestion volume of the digester / 3 place, add water and quicklime to the remaining water, gradually add to the digester, digest for about 10 minutes, pass through the suspension separator and 240-mesh circular vibrating sieve to obtain refined milk of lime;

[0040] (2) Adjust the concentration of milk of lime to 8 degrees Baume, CaCO 3 1% industrial white sugar crystal form control agent of dry basis quality, gets initial slurry;

[0041] (3) Put the carbonized initial slurry into an atmospheric jacketed glass reactor, the carbonization start temperature is 25°C, the maximum temperature is not more than 35°C, and the stirring speed is controlled at 800r / min / 900r / min / 1000r / min, carbon dioxide (purity 52%) gas flow rate is 3L / min, one-tim...

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Abstract

The invention discloses a technology for preparing spherical nanometer calcium carbonate. The nanometer calcium carbonate is prepared from highly active quicklime and a carbon dioxide gas with the purity being 50% by using a normal-pressure jacketed glass reactor as a reaction device; the activity of the highly active quicklime is 340-360; the carbon dioxide gas with the purity being 50% is prepared through mixing a carbon dioxide gas with the purity being 99% with air; and a continuous carbonization process is adopted, that is the preparation of the nanometer calcium carbonate is continuouslycompleted in the same reaction device. The introduction rate of the mixed gas is 3 L / min, and a ratio of the introduction amount of the carbon dioxide mixed gas every minute to the amount of a slurryin the glass reactor is 3:0.8. The spherical nanometer calcium carbonate prepared through the method has the advantages of good particle dispersion, uniform particle size in 50-80 nm, structured morphology and high purity; and the preparation technology has the advantages of great shortening of the carbonization reaction time, high production efficiency, increase of the utilization rate of the reaction device, and suitableness for being promoted and applied in industrial production.

Description

technical field [0001] The invention relates to a production process of nano calcium carbonate, in particular to a preparation process of spherical nano calcium carbonate. Background technique [0002] Nano-calcium carbonate is a new type of ultra-fine solid powder material developed in the 1980s. It is widely used in industries such as rubber, plastics, papermaking, chemical building materials, inks, coatings, sealants and adhesives. Its particle size ranges from 10nm to 100nm. between. At present, the preparation methods of nano calcium carbonate mainly include continuous spray carbonization method, high gravity carbonization method, intermittent bubbling carbonization method and so on. Among them, the production efficiency of the continuous spray multi-stage carbonization method is relatively high, and the utilization of carbon dioxide is relatively high, but the operability of its stable production is relatively poor, and the particle size distribution range of the fina...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18B82Y40/00
CPCB82Y40/00C01F11/181C01F11/183C01P2004/03C01P2004/04C01P2004/32C01P2004/52C01P2004/64
Inventor 宋军保宋海玉周鑫龙宋梦燕李岳
Owner 李岳
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