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A kind of preparation method of light calcium carbonate powder for papermaking coating

A light calcium carbonate powder and coating technology, which is applied in calcium carbonate/strontium/barium, papermaking, paper coating, etc., can solve the problems of high viscosity of light calcium carbonate unfavorable for papermaking coating, etc., and achieves easy industrial production and application Promote, reduce viscosity, and adjust viscosity index

Active Publication Date: 2022-04-19
浙江天石纳米科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome the problem that the high viscosity of light calcium carbonate is unfavorable for papermaking coating, the present invention provides a preparation method of light calcium carbonate powder for papermaking coating, and uses water-soluble plant macromolecular compounds to regulate the crystallization and growth of calcium carbonate particles process to produce low-viscosity light calcium carbonate powder, the process is simple, high stability, green and environmental protection, and can realize industrial production

Method used

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  • A kind of preparation method of light calcium carbonate powder for papermaking coating
  • A kind of preparation method of light calcium carbonate powder for papermaking coating

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Experimental program
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Effect test

Embodiment 1

[0026] (1) Send the limestone that has been washed, removed and air-dried into a fully automatic vertical kiln. The working temperature in the calcination zone is controlled at 900°C, and the low flow rate is maintained for 24 hours by blasting to calcine to obtain a purity of not less than 93% and an activity of 90°C. min of quicklime;

[0027] (2) The above-mentioned quicklime is sent to the squirrel cage ash machine after the coal ash and powder are removed by the drum sieve, and the wet digestion is carried out under the conditions of the liquid-solid ratio of 6.0 and the digestion temperature of 65 ℃ to obtain a low-viscosity calcium hydroxide slurry; Successively filter through 80 mesh, 120 mesh, 200 mesh and 325 mesh screens to remove large particle impurities, remove high specific gravity fine impurities through suspension separator, pump into the aging tank for 12 hours to obtain calcium hydroxide raw slurry, hydrogen Calcium oxide raw slurry is pumped into the carbon...

Embodiment 2

[0031] (1) with embodiment 1;

[0032] The above-mentioned quicklime is sent to the squirrel cage ash machine after the coal ash and powder are removed by the drum sieve, and the wet digestion is carried out under the conditions of the liquid-solid ratio of 6.0 and the digestion temperature of 65 ℃ to obtain a low-viscosity calcium hydroxide slurry; Mesh, 120 mesh, 200 mesh and 325 mesh screens to filter out large particles of impurities, after the suspension separator removes fine impurities with high specific gravity, pump them into the aging tank for 12 hours to obtain raw calcium hydroxide pulp, and the calcium hydroxide raw pulp Pump it into the carbonization workshop, adjust its mass concentration to 13±0.1%, and the temperature to 35±0.5°C;

[0033] Add 1.0% dextran and 1.0% water-soluble starch (both based on the solid content of calcium hydroxide) to the raw calcium hydroxide slurry, stir evenly and pump into 30 m 3 In the high-throughput circulating bubbling carboni...

Embodiment 3

[0036] (1) Same as (1) of Embodiment 1;

[0037] (2) The above-mentioned quicklime is sent to the squirrel cage ash machine after the coal ash and powder are removed by the drum sieve, and the wet digestion is carried out under the conditions of the liquid-solid ratio of 6.0 and the digestion temperature of 65 ℃ to obtain a low-viscosity calcium hydroxide slurry; Successively filter through 80 mesh, 120 mesh, 200 mesh and 325 mesh screens to remove large particle impurities, remove high specific gravity fine impurities through suspension separator, pump into the aging tank for 12 hours to obtain calcium hydroxide raw slurry, hydrogen Calcium oxide raw slurry is pumped into the carbonization workshop, and its mass concentration is adjusted to 13±0.1% and the temperature is 30±0.5°C;

[0038] (3) Add 1.5% water-soluble starch and 0.5% hydroxycellulose (both based on the solid content of calcium hydroxide) to the raw calcium hydroxide slurry, stir evenly and pump into 30m 3 In t...

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Abstract

The present invention relates to a preparation method of light calcium carbonate powder. Aiming at the problem that the high viscosity of light calcium carbonate is unfavorable for papermaking coating, a preparation method of light calcium carbonate powder for papermaking coating is provided, comprising the following steps: Calcining limestone first to prepare quicklime, then putting the quicklime into a lime machine for wet digestion to obtain calcium hydroxide slurry, after removing impurities and separating, pump it into the aging tank to age to obtain calcium hydroxide raw slurry, and adjust the mass concentration of calcium hydroxide raw slurry and temperature; then add water-soluble plant macromolecular compounds to the raw calcium hydroxide slurry, stir well and pump into the circulating bubbling carbonization tower for carbonation reaction, pump out the cooked calcium carbonate slurry after the reaction, separate and dehydrate to obtain light calcium dehydration powder; light calcium dehydrated powder is dried and sieved to obtain light calcium carbonate powder. The invention utilizes the water-soluble plant macromolecular compound to regulate the crystallization and growth process of calcium carbonate particles to prepare light calcium carbonate powder with low viscosity. The process is simple and stable, and industrial production can be realized.

Description

technical field [0001] The invention relates to a preparation method of light calcium carbonate powder, in particular to a preparation method of light calcium carbonate powder for papermaking coating. Background technique [0002] Light calcium carbonate (PCC) has been used as a coating pigment for paper production for a long time. Compared with heavy calcium carbonate (GCC), it has inherent advantages in purity, whiteness, particle regularity and particle size distribution. Therefore, PCC The smoothness, smoothness, opacity and printability of the coating are much higher than those of GCC. However, due to many physical and chemical reaction processes, calcium calcium acid has obvious characteristics of ultra-fine particles and high porosity, large particle gaps, large surface charge polarity, good interface activity, and strong water absorption, making its slurry under the same conditions The viscosity of the material is much higher than that of GCC with a relatively inert...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18D21H19/38
CPCC01F11/181C01F11/182D21H19/385C01P2006/12C01P2004/61
Inventor 田伟周新民翁超唐成
Owner 浙江天石纳米科技股份有限公司
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