Method for preparing aerogel by taking urban incineration waste ash as raw material through normal-pressure drying

A technology of incinerating garbage and drying at atmospheric pressure, applied in chemical instruments and methods, silica, inorganic chemistry, etc., to achieve the effects of reducing pollution, low equipment prices, good economic and environmental benefits

Pending Publication Date: 2021-09-03
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a method for preparing aerogels by drying under normal pressure with urban incineration garbage ash as a raw material, using urban incineration garbage ash as a raw material to prepare silica airgel, which not only solves the problem of urban incineration garbage ash , and solved the raw material source of silica airgel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A method for preparing airgel by drying under normal pressure with municipal incineration garbage ash as raw material comprises the following steps:

[0035] (1) Mix the municipal incineration garbage ash with 2mol / l sodium hydroxide solution, the mass ratio of urban incineration garbage ash to sodium hydroxide is 1:3, heat to boil and continue to stir for 1.5h, and obtain sodium silicate solution after filtration;

[0036] (2) passing the obtained sodium silicate solution through a strong acid type cation exchange resin to obtain a silicic acid solution with pH=1;

[0037] (3) adjust the pH to 4 to generate a gel with a concentration of 1mol / l ammonia, and age in the mother liquor, and the aging time is 1d;

[0038] (4) The aged wet gel was replaced with absolute ethanol for 1 day;

[0039] (5) Use trimethylchlorosilane and trimethylchlorosilane solution with a molar ratio of 3:4 for surface modification, modification 1d;

[0040] (6) The modified wet gel was dried u...

Embodiment 2

[0043] A method for preparing airgel by drying under normal pressure with municipal incineration garbage ash as raw material comprises the following steps:

[0044] (1) Mix the urban incineration garbage ash with 2mol / l sodium hydroxide solution, the mass ratio of the urban incineration garbage ash to sodium hydroxide is 1:3, heat to boil and keep stirring for 2h, and obtain the sodium silicate solution after filtering;

[0045] (2) passing the obtained sodium silicate solution through a strong acid type cation exchange resin to obtain a silicic acid solution with pH=1;

[0046] (3) adjust the pH to 4 to generate a gel with a concentration of 1mol / l ammonia, and age in the mother liquor, and the aging time is 1d;

[0047] (4) The aged wet gel was replaced with absolute ethanol for 1 day;

[0048] (5) Surface modification with a trimethylchlorosilane solution having a molar ratio of trimethylchlorosilane and n-hexane of 3:2, modification 1d;

[0049] (6) The modified wet gel ...

Embodiment 3

[0052] A method for preparing airgel by drying under normal pressure with municipal incineration garbage ash as raw material comprises the following steps:

[0053] (1) Mix the municipal incineration garbage ash with 2mol / l sodium hydroxide solution, the mass ratio of urban incineration garbage ash to sodium hydroxide is 1:4, heat to boil and keep stirring for 2.5h, and obtain sodium silicate solution after filtration;

[0054] (2) passing the obtained sodium silicate solution through a strong acid type cation exchange resin to obtain a silicic acid solution with pH=1;

[0055] (3) adjust the pH to 4 to generate a gel with a concentration of 1mol / l ammonia, and age in the mother liquor, and the aging time is 1d;

[0056] (4) The aged wet gel was replaced with absolute ethanol for 1 day;

[0057] (5) Use trimethylchlorosilane and trimethylchlorosilane solution with a molar ratio of 3:3 for surface modification, modification 1d;

[0058] (6) The modified wet gel was dried under ...

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Abstract

The invention relates to a method for preparing aerogel by taking urban incineration waste ash as a raw material through normal-pressure drying, which comprises the following steps: (1) mixing the urban incineration waste ash with a sodium hydroxide solution, heating and boiling the mixture, continuously stirring the mixture, and filtering the mixture to obtain a sodium silicate solution; (2) enabling the obtained sodium silicate solution to pass through strong acid type cation exchange resin to obtain a silicic acid solution; (3) adjusting the pH value with ammonia water to generate gel, and aging; (4) carrying out solution replacement on the aged wet gel by using absolute ethyl alcohol; (5) carrying out surface modification by using a trimethylchlorosilane solution; and (6) carrying out normal-pressure drying treatment on the modified wet gel to obtain the silicon dioxide aerogel. Compared with the prior art, the method has the advantages that the urban incineration waste ash is used as the raw material to prepare the silicon dioxide aerogel, so that the treatment problem of the urban incineration waste ash is solved, and the raw material source of the silicon dioxide aerogel is also solved.

Description

technical field [0001] The invention relates to a method for preparing silicon dioxide airgel, in particular to a method for preparing airgel by drying under normal pressure with urban incineration garbage ash as raw material. Background technique [0002] With the development of my country's economy, the rapid increase of population, the continuous expansion of urban scale and the continuous improvement of people's living standards, the output of municipal solid waste is also growing rapidly. The traditional domestic waste landfill method is no longer suitable for the requirements of environmental protection. The incineration of urban domestic waste has the advantages of less land occupation, easy site selection, short processing time, significant reduction, complete harmlessness and recyclable waste incineration waste heat power generation. And other advantages have become the primary solution for many cities to solve the garbage problem. However, after domestic waste is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/158C01B33/14
CPCC01B33/1585C01B33/14C01P2006/32
Inventor 孙振平张挺闫珠华葛好升穆帆远
Owner TONGJI UNIV
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