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Process for preparing submicron grade superfine calcium carbonate dispersion particle

An ultra-fine calcium carbonate, submicron-level technology, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of complex process control, low yield per unit volume, complex process control, etc.

Active Publication Date: 2006-01-25
建德华明科技有限公司
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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
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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 height-diameter ratio of 8:1 and an inner diameter of 140mm In the bubble carbonization tower, to 25m 3 / h.m 3 The speed of lime milk is carbon dioxide gas with a volume content of 20% for carbonization. When the carbonization rate reaches 90%, 4.8 g of sodium polypropylene is added. When the carbonization reaches the pH value of 7, the ventilation is continued for 20 minutes, and the ventilation carbonization is stopped. Then the product obtained is filtered, baked, pulverized, observed under a transmission electron microscope, and the electron microscope photo is as follows figure 1 , the morphology 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 16 m 2 / g (us...

Embodiment 2

[0026] First prepare 15 L of calcium hydroxide lime milk with a concentration of 10% and a temperature of 55 ° C, add 38.8 g of sodium sulfate, stir evenly, and then place the slurry in a drum with a height-diameter ratio of 8:1 and an inner diameter of 140 mm. bubble carbonation tower, with 2m 3 / h.m 3 The speed of lime milk is to pass carbon dioxide gas with a volume content of 40% for carbonization. When the carbonization rate reaches 95%, add 38.4g sodium polypropylene. When the carbonization reaches the pH value of 6.5, continue to ventilate for 30 minutes, stop ventilating carbonization, and then The obtained product is filtered, dried, pulverized, and observed under a transmission electron microscope. The obtained calcium carbonate has 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 15 L of calcium hydroxide lime milk with a weight concentration of 12% and a temperature of 40 ° C, then add 15 g of sodium bicarbonate, stir evenly, and then place the slurry in a liquid with a height-diameter ratio of 8:1 and an inner diameter of 140 mm. In the bubble carbonization tower, with 15m 3 / h.m 3 The speed of the milk of lime is to pass carbon dioxide gas with a volume content of 30% for carbonization. When the carbonization rate reaches 90%, add 57.6g of sodium dodecyl sulfonate, and when the carbonization reaches the pH value of 6.5, continue to ventilate for 20 minutes and stop. Aerated carbonization, then the obtained product was filtered, dried, pulverized, and observed under a transmission electron microscope. The obtained calcium carbonate was cubic or prismatic in shape, with an average particle size of 0.5 μm, a narrow particle size distribution, and a specific surface area of ​​10.3 m. 2 / g, the oil absorption value is 48DOPg / 100g. ...

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Abstract

A process for preparing the dispersed submicron-class calcium carbonate particles used for paper, paint, plastics, etc features that the merits of bubbling-carbonizing method and the basic principle of crystallography are used and the particular crystal form regulator and disperser are used to control the performance of crystals and the dispersion of particles.

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 ultrafine 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 ranging from 0.1 to 1.0 μm, and their morphology can be cubic, prismatic, rice-like or a mixture of the above. [0003] With the development of papermaking technology, precipitated calcium carbonate has become an indispensable and important raw material in the papermaking industry. High-quality precipitated calcium carbonate requires appearance properties such as high whiteness, high hiding power, ink fixation and excellent optical properties. Plastics processing requires calcium carbonate fillers to have lower oil absorption values ​​(larger loadings), high brightness and ease of mixi...

Claims

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Application Information

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Patent Type & Authority Applications(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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