A production method for synthesizing calcium silicate with high activity and low alkali content

A production method and technology of alkali content, applied in the field of calcium silicate, can solve the problems of high residual alkali content of synthetic calcium silicate, large amount of washing water, etc., and achieve well-developed pore structure, water-saving alkali removal, and high whiteness. Effect

Active Publication Date: 2020-04-10
临沂三禾生物质科技有限公司
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Problems solved by technology

[0005] In order to solve the problem of high residual alkali content of synthetic calcium silicate and large amount of washing water, improve product quality, meet the requirements of papermaking production and use, and improve the papermaking application technology of synthetic calcium silicate, the purpose of the present invention is to provide a synthetic calcium silicate Production method of calcium silicate with high activity and low alkali content

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  • A production method for synthesizing calcium silicate with high activity and low alkali content

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preparation example Construction

[0044] A further preferred preparation method comprises the following steps:

[0045] ①Mix milk of lime, water glass and water and react at 45°C for 100 minutes to obtain a reaction liquid; wherein the mass ratio of milk of lime, water glass and water is 1:1:25; the solid content of the milk of lime is 160g / L;

[0046] ②One-stage washing and dehydration: add water-resistant agent to the reaction solution obtained in step ①, stir evenly, and dehydrate to the first centrifuge until the solid content of the filter cake is 30%; the mass ratio of the reaction solution obtained in step ① to the water-resistant agent is 100:0.3%; the water repellent is polyacrylate;

[0047] The lye obtained by dehydration can be reused in the following steps: add water glass to the lye after a section of washing and dehydration for pretreatment, the modulus of the water glass solution after pretreatment is 0.8, and the concentration is 20g / L in terms of silicon dioxide , and then return to step ①...

Embodiment 1

[0055] A production method for synthesizing high-activity, low-alkali-content calcium silicate, comprising the following steps:

[0056] 1. 75kg milk of lime, 100kg water glass and 2000kg water were mixed, and reacted for 90 minutes at 30°C to obtain a reaction solution; the solid content of the milk of lime was 150g / L;

[0057] ② One-stage washing and dehydration: add water-resistant agent to the reaction solution obtained in step ①, stir evenly, and dehydrate to the first centrifuge until the solid content of the filter cake is 15%; the mass ratio of the reaction solution obtained in step ① to the water-resistant agent is 100:0.1%; the water-resistant agent is polyacrylate;

[0058] ③ Multi-stage washing and dehydration: put the filter cake from the first centrifuge into the dispersion tank, add 3 times the weight of water to it, redisperse into a slurry, and then dehydrate. After each dehydration operation, the solid content of the filter cake reaches 15 %, repeated operat...

Embodiment 2

[0061] A production method for synthesizing high-activity, low-alkali-content calcium silicate, comprising the following steps:

[0062] ①Mix milk of lime, water glass and water and react at 60°C for 120 minutes to obtain a reaction liquid; wherein the mass ratio of milk of lime, water glass and water is 1.5:1:30; the solid content of the milk of lime is 180g / L;

[0063] ② One-stage washing and dehydration: add water-resistant agent to the reaction solution obtained in step ①, stir evenly, and dehydrate to the first centrifuge until the solid content of the filter cake is 45%; the mass ratio of the reaction solution obtained in step ① to the water-resistant agent is 100:0.5%; the water-resistant agent is melamine formaldehyde resin;

[0064] ③Multi-stage washing and dehydration: put the filter cake from the first centrifuge into the dispersion tank, add 3~10 times the weight of water to it, re-disperse into a slurry, and then dehydrate. After each dehydration operation, the ...

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Abstract

The invention discloses a production method for synthesis of high activity and low alkali content calcium silicate. Based on the traditional 3-5 stages of washing, a water repellent agent and a dealkalization assistant are respectively added during the first stage of washing and dehydration and the last stage of washing and dehydration to reach the purposes of water saving and efficient removal ofalkali, wherein the water repellent agent added in the first stage of washing and dehydration is an alkali-resistant and hydrophobic high polymer, aluminum ions in the aluminum salt of the dealkalization assistant added in the last stage of washing and dehydration can react with sodium hydroxide in calcium silicate to produce water and aluminum hydroxide precipitate, thus reaching the dealkalization purpose. The preparation method provided by the invention has the advantages of simple and flexible operation, no influence on the existing calcium silicate synthesis process, and no need for adding of extra large equipment, and only needs adding of storage and adding equipment for corresponding assistant. At the same time, the method provided by the invention can substantially reduce the washing water consumption for synthesis of calcium silicate and reduce the consumption emission of water in the production process. In general, the method provided by the invention is highly operable andis easy for industrialization popularization and use.

Description

technical field [0001] The invention relates to the technical field of calcium silicate, in particular to a production method for synthesizing calcium silicate with high activity and low alkali content. Background technique [0002] The previous research and production show that synthetic calcium silicate is an excellent papermaking raw material, which can be used as paper functional filler, retention aid and thickening agent for paper production. After adding synthetic calcium silicate in the papermaking process, it can be obviously Increase the ash content of the paper, reduce the amount of plant fiber, and the high adsorption of synthetic calcium silicate helps to retain other fillers or fine components in the slurry, and greatly reduce the white water concentration. In addition, the advantages of light weight and large bulk of synthetic calcium silicate can give paper good bulk. In short, the use of synthetic calcium silicate in papermaking has significant economic and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/24C01F7/34
CPCC01B33/24C01F7/34C01P2004/61C01P2006/11C01P2006/12C01P2006/65
Inventor 郭建文王成海刘敬存郭庆凯
Owner 临沂三禾生物质科技有限公司
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