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The preparation method of active calcium silicate

A technology of active calcium silicate and desiliconization liquid, applied in silicate, alkaline earth metal silicate, climate sustainability, etc., can solve the problems of reducing the average particle size of active calcium silicate particles and the high content of large particles, Achieve the effect of reducing particle size, simple operation and strong operability

Active Publication Date: 2015-12-09
DATANG INT HIGH ALUMINA COAL R & D CENT
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of active calcium silicate, which solves the problem of high content of large particles caused by flocculation in active calcium silicate, can effectively reduce the large particles in active calcium silicate, and reduce the active calcium silicate. The average particle size of calcium silicate particles reduces the impact on the papermaking process and the quality of paper products

Method used

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  • The preparation method of active calcium silicate

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Effect test

Embodiment 1

[0022] Fly ash desiliconization solution with a solid content of 60g / L and milk of lime with a solid content of 160g / L were added to the reaction tank, and mixed with commercially available sodium metaphosphate for reaction to obtain active calcium silicate slurry. The molar ratio of calcium to silicon in lime milk and fly ash desiliconization liquid is 1:1, the reaction temperature is controlled at about 90°C, the reaction time is 40min, and the stirring speed can be 300r / min. The dosage of sodium metaphosphate is 1.0% of the dry weight of fly ash desiliconization liquid and milk of lime. After the reaction is completed, the obtained product slurry is sieved through a 100-mesh sieve, and then the sieved slurry is dried to obtain active calcium silicate, and the active calcium silicate is washed three times with water above 60°C to remove residual alkali.

[0023] The active calcium silicate specific surface area that the present embodiment obtains is 100-300m 2 / g, oil abso...

Embodiment 2

[0025] Active calcium silicate was prepared by the method in Example 1, except that the amount of sodium metaphosphate was 1.5% of the dry weight of fly ash desiliconization liquid and milk of lime.

[0026] The active calcium silicate specific surface area that the present embodiment obtains is 100-300m 2 / g, oil absorption value 150-300g / 100g, true density 1.2-1.5g / cm 3 , the bulk density is 0.15-0.30g / cm 3 , the pH value is 8-10 (tested under 20% solid content). The active calcium silicate obtained in this embodiment was tested for particle size, and the results are shown in Table 1.

Embodiment 3

[0028] Active calcium silicate was prepared by the method in Example 1, except that the amount of sodium metaphosphate was 2.0% of the dry weight of fly ash desiliconization liquid and milk of lime.

[0029] The active calcium silicate specific surface area that the present embodiment obtains is 100-300m 2 / g, oil absorption value 150-300g / 100g, true density 1.2-1.5g / cm 3 , the bulk density is 0.15-0.30g / cm 3 , the pH value is 8-10 (tested under 20% solid content). The active calcium silicate obtained in this embodiment was tested for particle size, and the results are shown in Table 1.

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Abstract

The invention provides a preparation method of activated calcium silicate. The method comprises the following steps: mixing lime milk, pulverized ash desilliconization liquid and a particle size control agent for reaction to obtain activated calcium silicate slurry, wherein the particle size control agent is one of pyrophosphate, metaphosphate, polyphosphate, polyacrylic ester and polyacrylate, the addition amount of pyrophosphate, metaphosphate or polyphosphate is 0.2-2.5% of dry weight of the pulverized ash desilliconization liquid and lime milk, and the addition amount of polyacrylic ester or polyacrylate is 0.05-0.5% of dry weight of the pulverized ash desilliconization liquid and lime milk. According to the preparation method, large particles in the activated calcium silicate can be effectively reduced, and the influence on the papermaking process and the quality of paper products can be reduced.

Description

technical field [0001] The invention relates to a preparation method of active calcium silicate, which belongs to the field of non-metallic mineral processing and application. Background technique [0002] Active calcium silicate has the advantages of high porosity and strong adsorption. It is an excellent papermaking raw material and can be used as paper functional filler, retention aid and thickening agent for paper production. [0003] Studies have shown that the main reason why active calcium silicate has this characteristic is that the powder particles are honeycomb-shaped micron-sized particles composed of nano-sheets combined with each other. However, the edges of the nano-sheets show strong nano-characteristics, and they will adsorb each other, and are easy to agglomerate, resulting in large flocculent particles. For the papermaking system, the large flocculent particles produced by the agglomeration of active calcium silicate particles will make it difficult to sie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/24
CPCC01B33/24C04B28/18C04B18/08C01P2006/10C01P2006/11C01P2006/12C01P2006/19Y02W30/91C04B22/16C04B24/2641C04B20/023C04B12/04C04B28/24
Inventor 孙俊民王成海张战军陈杨高志军魏晓芬徐鹏
Owner DATANG INT HIGH ALUMINA COAL R & D CENT
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