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Method for simultaneously preparing SiO2 aerogel and zeolite by utilizing fly ash

A technology of fly ash and airgel, which is applied in the field of simultaneous preparation of SiO2 airgel and zeolite by using fly ash to achieve the effect of convenient and easy process, reducing working time and improving processing efficiency

Inactive Publication Date: 2009-09-23
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, SiO is simultaneously prepared from industrial waste fly ash as raw material. 2 Airgel and zeolite materials have not been reported yet

Method used

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  • Method for simultaneously preparing SiO2 aerogel and zeolite by utilizing fly ash
  • Method for simultaneously preparing SiO2 aerogel and zeolite by utilizing fly ash
  • Method for simultaneously preparing SiO2 aerogel and zeolite by utilizing fly ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] ① Preparation of water glass solution

[0055] The fly ash was treated at 600°C for 3 hours, boiled in a boiling water bath to remove impurities for 2 hours, and then reacted with sodium hydroxide aqueous solution for hydrothermal synthesis. 12wt%, the reaction temperature is 100°C, and the reaction time is 4h; 30ml of hot deionized water (60-80°C) is added to replenish the volatilized water when the reaction is 2h. The reaction mixture was filtered with a vacuum pump to obtain a primary filtrate, and the filter residue was washed with 300ml deionized water and filtered to obtain a secondary filtrate. After the two filtrates were mixed, they were evaporated and concentrated in a water bath at 70°C to 80°C to 100ml to obtain a water glass solution with a modulus of 0.71; at the same time, the filter residue was collected for the preparation of zeolite materials.

[0056] ② Preparation of SiO 2 Hydrogels

[0057] Take 40ml of the prepared water glass solution, adjust t...

Embodiment 2

[0066] ① Preparation of water glass solution

[0067] Fly ash was subjected to high temperature treatment at 700°C for 2 hours, and then carried out hydrothermal synthesis reaction with aqueous sodium hydroxide solution. Add 30ml of hot deionized water at 2h to replenish the evaporated moisture; the reaction mixture was filtered with a vacuum pump to obtain a primary filtrate, the filter residue was washed with 300mL of deionized water and suction filtered to obtain a secondary filtrate, and the two obtained After the filtrates are mixed, they are evaporated and concentrated to 80 ml in a water bath at 70° C. to 80° C. to obtain a water glass solution with a modulus of 0.79; meanwhile, filter residues are collected for preparing zeolite materials.

[0068] ② Preparation of SiO 2 Hydrogels

[0069] Take 20ml of the prepared water glass solution and mix it fully with 30ml of deionized water, and then perform ion exchange with styrene cation exchange resin activated by 4% hydro...

Embodiment 3

[0078] ① Preparation of water glass solution

[0079] The fly ash was treated at 600°C for 2 hours, boiled in a boiling water bath to remove impurities for 2 hours, and then hydrothermally synthesized with sodium hydroxide aqueous solution. The reaction alkali-slag ratio was 0.5, the concentration of NaOH solution was 18wt%, and the reaction temperature was 100°C , the reaction time is 4h, 30ml of hot deionized water is added to supplement the volatilized water when the reaction is 2h; the reaction mixture is filtered with a vacuum pump to obtain a filtrate, and the filter residue is washed with 300ml of deionized water and filtered to obtain a second The filtrate, after mixing the obtained filtrate twice, evaporated and concentrated to 100ml in a water bath at 70°C to 80°C to obtain a water glass solution with a modulus of 0.43.

[0080] ② Preparation of SiO 2 Hydrogels

[0081] Take 40ml of the prepared water glass solution, adjust the pH value to 10 with 2mol / l sulfuric a...

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Abstract

The invention relates to a method for simultaneously preparing SiO2 aerogel and zeolite by utilizing fly ash, belonging to the technical field of the high-efficiency resource utilization of solid wastes and chemical material preparation. The method is as follows: the fly ash is firstly processed by high-temperature activation and then carries out hydro-thermal synthesis reaction with a sodium hydroxide water solution, soluble glass is catalyzed by a sulphuric acid with certain concentration, or the solution carries out cation exchange resin and is then processed by base catalysis to obtain SiO2 gel; aquagel is processed by solvent exchange / surface modification by utilizing a mixed solution of alcohols / alkanes solvent and trimethylchlorosilane, and the SiO2 aerogel is obtained under the condition of normal pressure and dryness; the fly ash is reacted with NaOH and then filtered to obtain filter residue, and the filter residue is further reacted with the NaOH so as to synthesize fly ash zeolite. The invention is not only a new way of the high-efficiency recycling of the solid wastes, but also a new technical method of the low-cost preparation of the SiO2 aerogel and the zeolite.

Description

technical field [0001] The invention relates to a high-efficiency resource utilization method of fly ash, which uses cheap industrial waste slag fly ash to prepare SiO 2 A method for airgel and zeolite, in particular to a process for simultaneously preparing airgel and fly ash zeolite from fly ash. Background technique [0002] Fly ash is a fine granular substance collected by a dust collector after pulverized coal is burned at high temperature in a boiler. The main chemical components of fly ash are oxides of silicon and aluminum, a small amount of oxides such as calcium and iron, and some carbon. my country is the world's largest producer and consumer of coal. Currently, the annual discharge of fly ash is about 180 million tons. It will increase rapidly accordingly, so it is increasingly important to increase the research and development of proper handling and comprehensive utilization of fly ash. Fly ash is a special resource mainly containing silicon and aluminum chemi...

Claims

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Application Information

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IPC IPC(8): C01B33/14C01B39/02C01B33/158
Inventor 史非刘敬肖宋凯
Owner DALIAN POLYTECHNIC UNIVERSITY
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