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Preparation process of nano calcium carbonate

A nano-calcium carbonate and preparation process technology, applied in the directions 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: 2017-03-29
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 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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  • Preparation process of nano calcium carbonate
  • Preparation process of nano calcium carbonate
  • Preparation process of nano calcium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Place weighed 100kg of quicklime with an activity of 380 on the feeding platform of the digester; raise the temperature of 500kg of water to 50°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 digestion machine, digest for 45 minutes, stop digestion, pass through an 80-mesh circular vibrating sieve to obtain lime milk;

[0021] (2) Maintain at 20-25°C, adjust the concentration of milk of lime to 10 degrees Baume, add Ca(OH) in milk of lime 2 An industrial white sugar crystal form control agent of 1.0% by dry basis to obtain initial slurry;

[0022] (3) will be 0.08m 3 The initial slurry is pumped into the effective reaction volume of 0.08m 3 In the first-stage carbonization tower, carbon dioxide with a purity of 99.5% is introduced, and the flow rate of high-purity carbon dioxide is controlled to be 2.5m 3 / h, keep th...

Embodiment 2

[0026] (1) Place weighed 100kg of quicklime with an activity of 360 on the feeding platform of the digester; raise the temperature of 500kg of water to 50°C as digested water; turn on the digester; add the digested water to 2% of the effective digestion volume of the digester / 3 place, add water and quicklime to the remaining water, gradually add it to the digestion machine, digest for 40 minutes, stop digestion, use 80-mesh circular vibrating sieve to get milk of lime;

[0027] (2) Maintain at 20-25°C, adjust the concentration of milk of lime to 10 degrees Baume, add Ca(OH) in milk of lime 2 An industrial white sugar crystal form control agent of 0.8% on a dry basis to obtain an initial slurry;

[0028] (3) will be 0.08m 3 The initial slurry is pumped into the effective reaction volume of 0.08m 3 In the first-stage carbonization tower, carbon dioxide with a purity of 99% is introduced, and the flow rate of high-purity carbon dioxide is controlled to be 2m 3 / h, keep the te...

Embodiment 3

[0032](1) Place weighed 100kg of quicklime with an activity of 370 on the feeding platform of the digester; raise the temperature of 500kg of water to 50°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 45 minutes, stop digestion, use 80-mesh circular vibrating sieve to get milk of lime;

[0033] (2) Maintain at 20-25°C, adjust the concentration of milk of lime to 10 degrees Baume, add Ca(OH) in milk of lime 2 An industrial white sugar crystal form control agent of 1.2% on a dry basis to obtain an initial slurry;

[0034] (3) will be 0.08m 3 The initial slurry is pumped into the effective reaction volume of 0.08m 3 In the first-stage carbonization tower, carbon dioxide with a purity of 99.7% is introduced, and the flow rate of high-purity carbon dioxide is controlled to be 3m 3 / h, keep the temperature in th...

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Abstract

The invention discloses a preparation process of nano calcium carbonate. High-activity quicklime and high purity carbon dioxide are adopted as the raw materials, and a three-stage carbonization tower is taken as the reaction equipment to carry out reaction for preparation of nano calcium carbonate. The high-activity quicklime has an activity degree of 360-380; the purity of the high purity carbon dioxide is greater than or equal to 99%; and the three-stage carbonization tower is formed by series connection of a first stage carbonization tower, a second stage carbonization tower and a third stage carbonization tower of different capacities in order, the effective reaction volume ratio of the first stage carbonization tower, the second stage carbonization tower and the third stage carbonization tower is 1:4:16, and the introduction amount per hour of the high purity carbon dioxide in each carbonization tower and the effective reaction volume of the carbonization tower are in a ratio of 2-3:0.08. The nano calcium carbonate prepared by the method provided by the invention has the advantages of good particle size dispersion and uniform size distribution in the range of 20-30nm, regular morphology and high purity, etc. Also, the preparation process provided by the invention greatly shortens the carbonization reaction time, has high production efficiency, also improves the utilization of the reaction equipment, and is suitable for popularization and application in industrial production.

Description

technical field [0001] The invention relates to the field of preparation of calcium carbonate, in particular to a preparation process of nanometer 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 final prep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18B82Y40/00
CPCB82Y40/00C01F11/181C01P2004/03C01P2004/64C01P2006/80
Inventor 宋海玉宋梦燕冯一章谭和宋
Owner 李岳
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