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Preparation process of spindle-shaped 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 problem of low production efficiency, wide particle size distribution and poor uniformity of spindle-shaped nano-calcium carbonate and other problems, to achieve the effect of shortened carbonization reaction time, uniform particle size and stable production quality

Active Publication Date: 2018-03-13
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 spindle-shaped 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 spindle-shaped nano-calcium carbonate by intermittent bubbling

Method used

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  • Preparation process of spindle-shaped nano calcium carbonate
  • Preparation process of spindle-shaped nano calcium carbonate
  • Preparation process of spindle-shaped nano calcium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Place weighed 100kg of quicklime with an activity of 420mL on the feeding platform of the digester; raise the temperature of 500kg of water to 60°C as digested water; turn on the digester; add the digested water to 2% of the effective digestion volume of the digester / 3, add water and quicklime to the remaining water, gradually add it into the digestion machine, stop the digestion for 45 minutes, and pass it through a 240-mesh circular vibrating sieve to obtain milk of lime.

[0030] (2) Maintain the condition of 20-25 ℃, adjust the concentration of lime milk to 8 degrees Baume, add Ca(OH) in lime milk 2 1.0% crystal form control agent A (industrial white sugar) and 0.8% crystal form control agent B (polyphosphate) on a dry basis to obtain an initial slurry.

[0031] (3) will be 0.08m 3 The initial slurry is pumped into the effective reaction volume of 0.08m 3 In the primary carbonization tower, high-purity carbon dioxide (concentration = 95% mixed gas, the rest ...

Embodiment 2

[0037] (1) Place weighed 100kg of quicklime with an activity of 380mL on the feeding platform of the digester; raise the temperature of 500kg of water to 60°C as digested water; turn on the digester; add the digested water to 2% of the effective digestion volume of the digester / 3, add water and quicklime to the remaining water, gradually add it into the digestion machine, stop the digestion for 40 minutes, and pass it through a 240-mesh circular vibrating sieve to obtain milk of lime.

[0038] (2) Maintain the condition of 20-25 ℃, adjust the concentration of lime milk to 8 degrees Baume, add Ca(OH) in lime milk 2 1.0% crystal form control agent A (industrial white sugar) and 0.8% crystal form control agent B (polyphosphate) on a dry basis to obtain an initial slurry.

[0039] (3) will be 0.08m 3 The initial slurry is pumped into the effective reaction volume of 0.08m 3 In the primary carbonization tower, carbon dioxide (concentration = 65% mixed gas, the rest is air) is i...

Embodiment 3

[0045] (1) Place weighed 100kg of quicklime with an activity of 360mL on the feeding platform of the digester; raise the temperature of 500kg 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 it into the digestion machine, stop the digestion for 45 minutes, and pass it through a 240-mesh circular vibrating sieve to obtain milk of lime.

[0046] (2) Maintain the condition of 20-25 ℃, adjust the concentration of lime milk to 8 degrees Baume, add Ca(OH) in lime milk 2 1.0% crystal form control agent A (industrial white sugar) and 0.8% crystal form control agent B (polyphosphate) on a dry basis to obtain an initial slurry.

[0047] (3) will be 0.08m 3 The initial slurry is pumped into the effective reaction volume of 0.08m 3 In the primary carbonization tower, carbon dioxide (concentration = 32% mixed gas, the rest is air) is intro...

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Abstract

The invention discloses a preparation process of spindle-shaped nano calcium carbonate. High-activity quicklime and carbon dioxide are used as raw materials, and a two-stage carbonization tower is used as reaction equipment for reaction preparation; and the two-stage carbonization tower is formed by serially connecting a primary carbonization tower with a secondary carbonization tower, the effective reaction volume ratio of the primary carbonization tower to the secondary carbonization tower is 1: 4, and the effective reaction volume ratio of the feeding amount of carbon dioxide in every carbonization tower per hour to the carbonization tower is 3-5 L / min: 0.8 L. The spindle-shaped nano calcium carbonate prepared by the method has the advantages of good particle dispersity, uniform size, draw ratio being 200: 40 nm, regular shape, high purity, good dispersion effect and the like. Moreover, the carbonization reaction time of the provided preparation process is greatly shortened, the production efficiency is high, meanwhile, the utilization rate of the reaction equipment is increased, and thus, the preparation process is suitable for being popularized and used 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 spindle-shaped 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18B82Y40/00
CPCB82Y40/00C01F11/181C01P2004/03C01P2004/30C01P2004/51Y02P20/141
Inventor 宋军保宋海玉周鑫龙李岳宋梦燕
Owner 李岳
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