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Process for preparing submicron grade superfine calcium carbonate dispersion particle

An ultra-fine calcium carbonate, sub-micron technology, applied in the direction of calcium carbonate/strontium/barium, etc., can solve problems such as low yield per unit volume, complicated process control, and complex process control

Active Publication Date: 2009-09-30
建德华明科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses a lower concentration of milk of lime, repeated multi-step operations, complex process control, and low yield per unit volume
[0009] Chinese Patent Application No. 200410025155.7 discloses a method for producing ultrafine calcium carbonate dispersible particles by a two-step carbonization method. At first, the method needs to synthesize nano-calcium carbonate as a seed crystal, and then add the seed crystal to the milk of lime slurry, and In the presence of additives, two-step carbonization synthesizes dispersible calcium carbonate particles with a controllable particle size of 0.1-1 μm. The process control is relatively complicated.

Method used

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  • Process for preparing submicron grade superfine calcium carbonate dispersion particle

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] First prepare 15L of calcium hydroxide lime milk with a weight concentration of 10% and a temperature of 30°C, then add 9.6g of ammonium chloride, stir evenly, and then place the slurry in a In the bubbling carbonization tower, with 25m 3 / h.m 3 The speed of the milk of lime is passed into carbon dioxide gas with a volume content of 20% for carbonization. When the carbonization rate reaches 90%, add 4.8g sodium polypropylene. When the carbonization reaches a pH value of 7, continue to ventilate for 20 minutes and stop the ventilated carbonization. The resulting product is then filtered, dried, pulverized, and observed under a transmission electron microscope. The electron microscope photos are as follows: figure 1 , the shape of the obtained calcium carbonate is cubic or prismatic, the average particle size is 0.2 μm, the particle size distribution is narrow, and the specific surface area is 16m 2 / g (using GB / T2922-1982 "Chemical Reagent Chromatographic Carrier Speci...

Embodiment 2

[0026] First prepare 15L of calcium hydroxide lime milk with a concentration of 10% and a temperature of 55°C, then add 38.8g of sodium sulfate, stir evenly, and then place the slurry in a drum with a height-to-diameter ratio of 8:1 and an inner diameter of 140mm. Soak in the carbonization tower, with 2m 3 / h.m 3 The speed of milk of lime is fed into carbon dioxide gas with a volume content of 40% for carbonization. When the carbonization rate reaches 95%, add 38.4g sodium polypropylene polypropylene. When carbonization reaches a pH value of 6.5, continue ventilation for 30 minutes, stop ventilation carbonization, and then The resulting product was filtered, dried, crushed, and observed under a transmission electron microscope. The obtained calcium carbonate had a cubic or prismatic shape, an average particle size of 0.4 μm, a narrow particle size distribution, and a specific surface area of ​​13 m 2 / g, the oil absorption value is 50DOPg / 100g.

Embodiment 3

[0028] First prepare 15L of calcium hydroxide lime milk with a weight concentration of 12% and a temperature of 40°C, then add 15g of sodium bicarbonate, stir evenly, and then place the slurry in a tank with a height-to-diameter ratio of 8:1 and an inner diameter of 140mm. In the bubbling carbonization tower, with a length of 15m 3 / h.m 3 The speed of lime milk is passed into carbon dioxide gas with a volume content of 30% for carbonization. When the carbonization rate reaches 90%, add 57.6g of sodium dodecylsulfonate. When the carbonization reaches a pH value of 6.5, continue to ventilate for 20 minutes and stop Ventilate and carbonize, then filter, dry, and pulverize the resulting product, and observe under the transmission electron microscope, the obtained calcium carbonate has a cubic or prismatic shape, an average particle size of 0.5 μm, a narrow particle size distribution, and a specific surface area of ​​10.3m 2 / g, the oil absorption value is 48DOPg / 100g.

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Abstract

The invention discloses a preparation method of submicron superfine calcium carbonate dispersed particles. The present invention absorbs the advantages of the bubbling carbonization method, and then according to the basic principles of crystallography, uses a specific crystal form modifier to control the nucleation of crystals and the growth rate of each crystal plane, especially adding a dispersant at the end of the carbonization reaction to adjust The surface charge and space resistance of the particles make the particles have good dispersion. Not only suitable for paper filler and paper coating pigment with high gloss and low viscosity, but also suitable for semi-reinforcing agent and filler in coatings, plastics and other applications.

Description

technical field [0001] The invention relates to a preparation method of calcium carbonate particles suitable for paper, in particular to a preparation method of submicron superfine calcium carbonate particles. Background technique [0002] The submicron ultrafine calcium carbonate particles referred to in the present invention refer to calcium carbonate particles with an average particle size between 0.1 and 1.0 μm, and their appearance can be cubic, prism, rice grain or a mixture of the above shapes. [0003] With the development of papermaking technology, precipitated calcium carbonate has become an indispensable and important raw material for papermaking. High-quality precipitated calcium carbonate needs to have appearance characteristics such as high whiteness, high hiding power, ink fixation and excellent optical properties. Plastics processing requires calcium carbonate fillers with lower oil absorption values ​​(higher fill capacity), high brightness and ease of mixi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18
Inventor 马新胜陈雪梅吴秋芳李福清高玮
Owner 建德华明科技有限公司
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