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A method for preparing calcium silicate powder by liquid-phase dynamic hydrothermal synthesis

A dynamic hydrothermal, calcium silicate powder technology, applied in the direction of silicate, alkaline earth metal silicate, etc., can solve the problem of the large difference in the composition and microstructure of fly ash, affecting the structural properties and performance of materials, powder The stability requirements of coal ash components are relatively high, and the effects of easy industrialization and promotion, small changes in synthesis process and equipment, and simple and feasible preparation process are achieved.

Active Publication Date: 2020-07-28
内蒙古普诺思新材料科技有限公司
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Problems solved by technology

This causes high energy consumption in the reaction process of preparing sodium silicate solution from fly ash desiliconization. In addition, under this process condition, the washing after fly ash desiliconization also produces a large amount of washing water. After calcium silicate synthesis and filtration washing Correspondingly, a large amount of dilute lye needs to be recycled and concentrated for reuse, which also intensifies the energy and water consumption of lye recycling in the later stage
[0005] 2. Fly ash produced by power plants is affected by many factors such as coal composition, power plant furnace structure, and operating conditions, resulting in large differences in the composition and microstructure of fly ash in the same region, and fly ash in different regions. greater difference
Therefore, the use of amorphous silicon oxide in fly ash as the siliceous raw material for the synthesis of calcium silicate has the problem of high stability requirements for fly ash components, resulting in insufficient sources of raw materials and large regional restrictions.
[0006] 3. In the calcium silicate prepared by the traditional process, the siloxy and silanol functional groups on the surface are combined by water molecules, and some of the functional groups are connected with the Na in the unwashed dilute lye. + Ions are closely combined, resulting in poor surface activity, low specific surface area and low oil absorption value of calcium silicate powder. In addition, calcium silicate is not pulverized during the drying process, and a large number of fine particles are agglomerated into large particles under the action of bound water. , directly affects the structural properties and performance of the material, and does not maximize the properties of calcium silicate

Method used

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  • A method for preparing calcium silicate powder by liquid-phase dynamic hydrothermal synthesis
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  • A method for preparing calcium silicate powder by liquid-phase dynamic hydrothermal synthesis

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Experimental program
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Effect test

Embodiment 1

[0041] Take SiO 2 Content 99.2%, Fe 2 o 3 Content of 0.015%, MgO content of 0.01%, 20g of high-purity quartz sand with a moisture content of 2.5%, use a pulverizer to finely grind the particle size below 0.1mm, and then add it to 81.43g of sodium hydroxide solution with a concentration of 14%, and stir Finally, a slurry is formed. Under this condition, the mass ratio of sodium oxide and quartz sand on a dry basis is controlled to be 0.5:1. The temperature of the slurry is raised to 185°C and 1.2Mpa. The reaction is carried out for 2.5 hours under this condition. After the reaction, the slurry is solidified. The liquid is separated, and the crude sodium silicate solution is finely filtered through a leaf filter, and the solid waste is returned to the quartz sand feed port for recycling, and the obtained sodium silicate solution has a SiO 2 The concentration is 115g / L, and it is used as the siliceous raw material for the hydrothermal synthesis of calcium silicate.

[0042] Af...

Embodiment 2

[0050] Take SiO 2 Content 99.6%, Fe 2 o 3 Content 0.010%, MgO content 0.008%, 20g of high-purity quartz sand with a moisture content of 2.8%, use a pulverizer to finely grind to a particle size of less than 0.1mm, then add it to 81.43g of a 14% sodium hydroxide solution, and stir Finally, a slurry is formed. Under this condition, the mass ratio of sodium oxide and quartz sand on a dry basis is controlled to be 0.6:1. The temperature of the slurry is raised to 195°C and 1.9Mpa. The reaction is carried out for 3 hours under this condition. After the reaction, the slurry is subjected to solid-liquid Separate, and finely filter the crude sodium silicate solution through a leaf filter, and return the solid waste to the quartz sand feed port for recycling, and the obtained sodium silicate solution has a SiO 2 The concentration is 95g / L, and it is used as a siliceous raw material for hydrothermally synthesizing calcium silicate.

[0051] After crushing, stone washing and grading, ...

Embodiment 3

[0054] Take SiO 2 Content 98.9%, Fe 2 o 3 Content of 0.009%, MgO content of 0.006%, 20g of high-purity quartz sand with a moisture content of 2.2%, use a pulverizer to finely grind to a particle size of less than 0.1mm, and then add it to 75g of a sodium hydroxide solution with a concentration of 16%. After stirring Form a slurry. Under this condition, the mass ratio of sodium oxide and quartz sand on a dry basis is controlled to be 0.6:1. The temperature of the slurry is raised to 205°C and 2.1Mpa. The reaction is carried out for 3.5 hours under this condition. After the reaction, the slurry is subjected to solid-liquid Separate, and finely filter the crude sodium silicate solution through a leaf filter, and return the solid waste to the quartz sand feed port for recycling, and the obtained sodium silicate solution has a SiO 2 The concentration is 115g / L, and it is used as the siliceous raw material for the hydrothermal synthesis of calcium silicate.

[0055] After crushin...

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Abstract

The invention relates to a method of preparing calcium silicate powder by a liquid phase dynamic hydrothermal synthesis method and belongs to the technical field of hydrated calcium silicate. The method comprises the steps of preparing lime emulsion and a sodium silicate solution, controlling a mole ratio of CaO to SiO2 in the sodium silicate solution and the lime emulsion to be 0.95-1.05, and a water-solid mass ratio to be (5-15):1, performing uniform mixing, heating to 75-100 DEG C, controlling heating and reaction time to be 1-2.5h, and a stirring rate to be 100-400rpm, and after a reactionis finished, performing washing, dealkalization, surface treatment, drying and pulverization on a product to form the calcium silicate powder, wherein the lime emulsion is prepared by roasting limestone into active quicklime and then performing digestion, purification and dilution; an effective calcium CaOr concentration of the lime emulsion is controlled to be 140-220g / L; the sodium silicate solution is prepared by alkali dissolution and dilution of high purity quartz sand; and contents of SiO2 and Na2O in the obtained sodium silicate solution are controlled to be 35-140g / L and 50-80g / L respectively. The prepared powder has very good reinforcement performance and chemical bonding performance, and better chemical adsorption performance; and a microstructure of the powder is a loose poroushornet nest-like particle aggregate formed by stacking fold sheets.

Description

technical field [0001] The invention belongs to the technical field of hydrated calcium silicate, and relates to a method for preparing calcium silicate powder by a liquid-phase dynamic hydrothermal synthesis method. The present invention uses quartz sand and limestone as raw materials, and utilizes a hydrothermal synthesis process and a specific post-treatment method to prepare calcium silicate powder materials. There are siloxyl and silanol functional groups on the surface of the prepared powder materials, which have strong reinforcement. performance and chemical bonding performance, and has strong chemical adsorption performance; the microstructure of the material is a loose and porous particle aggregate similar to a hornet's honeycomb formed by the accumulation of folded sheets. Background technique [0002] The synthetic calcium silicate powder material is a kind of calcium silicate hydrate, and its chemical formula is CaO·SiO 2 ·nH 2 O, the phase composition is mainl...

Claims

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Application Information

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IPC IPC(8): C01B33/24
CPCC01B33/24C01P2004/61C01P2006/11C01P2006/12C01P2006/16C01P2006/17C01P2006/40C01P2006/65
Inventor 徐鹏齐建军
Owner 内蒙古普诺思新材料科技有限公司
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