Preparation method of silicon dioxide aerogel

A technology of silica and airgel, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve the problem of not being able to prepare airgel particles that meet the requirements, airgel is not enough to meet the application, air condensation Problems such as high content of glue impurities, etc., achieve the effect of reducing requirements, improving safety performance, and reducing energy consumption

Inactive Publication Date: 2015-10-07
ZHUO DA NEW MATERIAL TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, the airgel prepared from the existing fly ash contains a large amount of impurities, there is no better method to remove the impurity ions in the gel,

Method used

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  • Preparation method of silicon dioxide aerogel

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preparation example Construction

[0037] Such as figure 1 Shown, the preparation method of silica airgel of the present invention, comprises the steps:

[0038] (1) Preparation of sol

[0039] According to the mass ratio of fly ash (or coal gangue): sodium carbonate (or calcium carbonate, potassium carbonate) of 1:0.3~1:0.6, take fly ash and sodium carbonate, mix them and grind them mechanically, at a temperature above 870°C , heat preservation and calcining for 240min~300min to obtain the calcined product;

[0040] According to the ratio of adding 10L~30L sulfuric acid solution per 1Kg calcined product, mix the calcined product with sulfuric acid solution, react at room temperature for 10min~20min, the sulfuric acid concentration is 2mol / l~5mol / l, and pump the reacted material filter to obtain the filtrate, and the filtrate is processed by removing the cation exchange resin, and the resulting solution is adjusted to a pH value of 4~6 or 8~10 by an alkali solution to obtain a silica sol, and the alkali solut...

Embodiment 1

[0057] The preparation method of silica airgel of the present invention, comprises the steps:

[0058] (1) Preparation of sol

[0059] Take fly ash and sodium carbonate according to the mass ratio of fly ash: sodium carbonate of 1:0.3, mix them, grind them mechanically, and heat-preserve and calcinate for 240min at a temperature above 870°C to obtain a calcined product;

[0060] According to the ratio of adding 10L sulfuric acid solution per 1Kg calcined product, mix the calcined product with sulfuric acid solution, react at room temperature for 10min, the sulfuric acid concentration is 2mol / l, suction filter the reacted material to obtain the filtrate, pass the filtrate through Remove the cation exchange resin for treatment, and adjust the pH value of the obtained solution to 4 through an alkali solution to obtain a silica sol. The alkali solution can be a sodium hydroxide solution or a water glass solution.

[0061] 2. Silica sol gelation

[0062] The silica sol was left t...

Embodiment 2

[0070] The preparation method of silica airgel of the present invention, comprises the steps:

[0071] (1) Preparation of sol

[0072] According to the mass ratio of coal gangue: calcium carbonate is 1:0.4, coal gangue and calcium carbonate are taken, mixed, mechanically pulverized, and kept for calcination at a temperature above 870°C for 260min to obtain a calcined product;

[0073] According to the ratio of adding 20L sulfuric acid solution per 1Kg calcined product, mix the calcined product with sulfuric acid solution, react at room temperature for 15min, the sulfuric acid concentration is 4mol / l, suction filter the reacted material to obtain the filtrate, pass the filtrate through Remove the cation exchange resin for treatment, and adjust the pH value of the obtained solution to 6 through an alkali solution to obtain a silica sol. The alkali solution can be a sodium hydroxide solution or a water glass solution.

[0074] 2. Silica sol gelation

[0075] The silica sol was ...

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Abstract

The invention provides a preparation method of silicon dioxide aerogel, which can reduce the cost and prolong the service life of equipment. The preparation method comprises the following steps: (1) preparing sol; (2) gelatinizing silicon sol; (3) alcoholizing; (4) carrying out the surface hydrophobic modification; (5) drying at the normal pressure. According to the preparation method of the silicon dioxide aerogel, industrial waste slag-coal powder which is low in price and rich in resource is used as a raw material to substitute an organic silicon source high in price, so that the application cost is greatly reduced; the normal-pressure drying substitutes the supercritical drying, so that on one hand, the requirement of the entire process on the equipment is greatly lowered, the safety performance is greatly improved, and on the other hand, the operation cost is greatly reduced; moreover, the corrosion to the equipment is reduced, the requirement on the equipment is greatly lowered, the water washing is not needed, the energy consumption is reduced, the water resource is saved, and more energy conservation and environmental protection can be realized.

Description

technical field [0001] The present invention relates to a kind of, especially a kind of preparation method of silica airgel. Background technique [0002] Silica airgel is a porous material with low density, high specific surface area, and low thermal conductivity. It has a continuous network structure. , thermal, optical, and acoustic properties, so it has broad application prospects in the fields of thermal insulation materials and photocatalytic materials. [0003] In order to obtain silica airgel with a porous structure, the method currently used is mainly to use tetraethyl orthosilicate as the silicon source, and it is prepared by sol-gel and supercritical processes. This preparation method has high raw material costs, high Problems such as complex process and high risk restrict its large-scale industrial production and use in various fields. [0004] my country is the world's largest producer and consumer of coal. The output of industrial fly ash is huge, and the o...

Claims

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Application Information

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IPC IPC(8): C01B33/158
Inventor 刘建波杨卓舒刘国强邝清林冯强陈赓车君超
Owner ZHUO DA NEW MATERIAL TECH GRP
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