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Method for preparing silica aerogel from desilicication liquid of fly ash

A technology of silica and fly ash, which is applied in the field of solid waste resource utilization, can solve the problems of unusable inorganic salt waste liquid, high cost of raw materials, complicated process, etc., and achieve economic benefit and value, low cost, The effect of mild conditions

Inactive Publication Date: 2017-07-28
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of high cost of raw materials, complicated process and unusable large amount of inorganic salt waste liquid in the preparation process of silica airgel, the purpose of the invention is to provide a method for preparing silica airgel by using fly ash desiliconization liquid The method, the method uses cheap and easy-to-obtain solid waste-fly ash desiliconization liquid as raw material, and cooperates with carbon dioxide resource utilization to prepare silica airgel, which can avoid the generation of a large amount of inorganic salt waste liquid, and has low cost , no secondary pollution, mild conditions, easy industrial production, etc.

Method used

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  • Method for preparing silica aerogel from desilicication liquid of fly ash
  • Method for preparing silica aerogel from desilicication liquid of fly ash

Examples

Experimental program
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Effect test

Embodiment 1

[0059] A preparation method of silica airgel, comprising the steps of:

[0060] (1) Raise the temperature of the fly ash desiliconization solution to 90°C, feed a mixture of carbon dioxide and nitrogen at a temperature of 90°C and a volume ratio of 1:1 at a rate of 1L / min, react at 0.1MPa for 30min, and obtain two Silica wet gel;

[0061] (2) Add a sodium hydroxide solution with a concentration of 1mol / L and a volume 0.5 times the volume of the silica wet gel to the silica wet gel for aging, and age at 50°C for 24h; then use the gel 1 at 50°C Doubling the volume of ethanol for solvent replacement, the solvent replacement was carried out 3 times, each time for 12 hours, to obtain the replacement solution and the silica wet gel after replacement;

[0062] (3) Surface modification of the silica wet gel after replacement-solvent replacement for 48 hours at 0°C, the surface modifier is trimethylchlorosilane, the replacement solvent is a mixed solvent of n-hexane and ethanol, and t...

Embodiment 2

[0065] A preparation method of silica airgel, comprising the steps of:

[0066] (1) Raise the temperature of the desiliconization solution to 80°C, pass through a mixture of carbon dioxide and nitrogen at a temperature of 80°C and a volume ratio of 0.5:1 at a rate of 2L / min, and react at 0.8MPa for 100min to obtain silicon dioxide wet condensation glue;

[0067] (2) Add sodium carbonate solution with a concentration of 2mol / L and isopropanol to the silica wet gel for aging, the volume ratio of sodium carbonate solution:isopropanol:gel is 1:1:1, and age at 60°C 18h; then at 60°C, use 2 times the volume of isopropanol for solvent replacement of the gel. The solvent replacement is performed once for 24 hours to obtain the replacement solution and the substituted silica wet gel; the replacement solution is used to prepare super fine calcium carbonate;

[0068] (3) Surface modification of the substituted silica wet gel at 2°C-solvent replacement for 45 hours, the surface modifier...

Embodiment 3

[0071] A preparation method of silica airgel, comprising the steps of:

[0072] (1) Raise the temperature of the desiliconization solution to 50°C, pass through a mixture of carbon dioxide and helium at a temperature of 50°C and a volume ratio of 100:1 at a rate of 0.01L / min, and react at 1MPa for 300min to obtain silica wet gel;

[0073] (2) Add ammonia solution with a concentration of 0.1mol / L and n-butanol to the silica wet gel for aging, the volume ratio of ammonia solution: n-butanol: gel is 1:10:1, and age at 20°C for 100h ; Then use 0.2 times the volume of the gel to perform solvent replacement with n-butanol at 20°C, and perform solvent replacement 5 times, each time for 48 hours, to obtain a replacement solution and a replaced silica wet gel;

[0074](3) Surface modification of the silica wet gel after replacement-solvent replacement for 40 hours at 5°C, the surface modifier is aminopropyltriethoxysilane, and the replacement solvent is a mixed solvent of n-hexane and...

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Abstract

The invention provides a method for preparing a silica aerogel from desilicication liquid of fly ash. The method comprises the following steps: (1) subjecting the desilicication liquid of fly ash and carbon dioxide gas to a carbonization reaction at 0 to 90 DEG C so as to obtain a wet silica gel; (2) carrying out ageing on the wet silica gel and then subjecting the aged wet silica gel to displacement with a solvent so as to obtain displacement liquid and a displaced wet gel; and (3) carrying out aftertreatment on the displaced wet gel so as to obtain the silica aerogel. The method can prepare the silica aerogel with the cheap and easily available desilicication liquid of fly ash as a raw material under cooperation of recycled carbon dioxide, prevents production of a great amount of waste inorganic salt liquid, realizes cyclic utilization of an alkaline solution and combined production of an ultrafine calcium carbonate product, and has the advantages of low cost, no secondary pollution, mild conditions, suitability for industrial application, etc.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of solid waste, and relates to a method for preparing high-performance materials through synergistic utilization of fly ash and carbon dioxide, in particular to a method for preparing silica airgel by using fly ash desiliconization liquid. Background technique [0002] Fly ash is mainly produced in coal-fired power plants, with huge emissions, and its large-scale stockpiling has led to serious pollution of the atmosphere, water and soil. In recent years, research on the high-value utilization of fly ash has been widely carried out at home and abroad, and many technical routes have been formed, such as extraction of alumina from fly ash, preparation of mullite refractory materials, and oil fracturing proppants. These processes all involve the pre-desilication process of fly ash, which inevitably produces a large amount of highly alkaline desiliconization liquid, the main components of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/158C01F11/18
CPCC01B33/1585C01F11/18
Inventor 李会泉朱干宇王兴瑞
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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