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 The effects of popularization, adjustable viscosity index, and simple process

Active Publication Date: 2021-01-12
浙江天石纳米科技股份有限公司
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  • Abstract
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  • 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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  • Preparation method of light calcium carbonate powder for papermaking coating
  • Preparation method of light calcium carbonate powder for papermaking coating

Examples

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, and the working temperature in the calcination zone is controlled at 900 ℃, and the blast calcination is maintained at a low flow rate for 24 hours to obtain a purity of not less than 93% and an activity of 90 ℃. 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; Filter through 80-mesh, 120-mesh, 200-mesh and 325-mesh sieves successively to remove large particles of impurities. After removing fine impurities with high specific gravity through a suspension separator, pump them into the aging tank for 12 hours to obtain raw calcium hydroxide slurry. The calcium raw slurry is pumped...

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°C 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 slurry, and the calcium hydroxide raw Pump the slurry 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 ca...

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; Filter through 80-mesh, 120-mesh, 200-mesh and 325-mesh sieves successively to remove large particles of impurities. After removing fine impurities with high specific gravity through a suspension separator, pump them into the aging tank for 12 hours to obtain raw calcium hydroxide slurry. The calcium 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...

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Abstract

The invention relates to a preparation method of light calcium carbonate powder, and provides a preparation method of light calcium carbonate powder for papermaking coating aiming at the problem thatthe viscosity of light calcium carbonate is relatively high and is not beneficial to papermaking coating. The preparation method comprises the following steps: calcining limestone to prepare quick lime, putting the quick lime into an ashing machine, and carrying out wet digestion to obtain calcium hydroxide slurry; removing impurities, separating, pumping into a curing tank, aging to obtain calcium hydroxide raw pulp, and regulating the mass concentration and temperature of the calcium hydroxide raw pulp; then adding a water-soluble plant macromolecular compound into the calcium hydroxide rawpulp, uniformly stirring, pumping into a circulating bubbling carbonizer for carbonation reaction, pumping out calcium carbonate cooked pulp after the reaction is finished, and separating and dehydrating to obtain light calcium dehydrated powder; and drying and screening the light calcium carbonate dehydrated powder to obtain the light calcium carbonate powder. The water-soluble plant macromolecular compound is used for regulating and controlling the crystallization and growth process of calcium carbonate particles, the low-viscosity light calcium carbonate powder is prepared, the technological process is simple, the stability is high, and industrial production can be achieved.

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 Applications(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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