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Method for preparing Al2O3-SiO2 aerogel

An al2o3-sio2, aerogel technology, applied in silica, alumina/aluminum hydroxide, silica and other directions, can solve problems such as aerogels that have not yet been found

Active Publication Date: 2015-05-06
CHINA SHENHUA ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, up to now, no direct preparation of Al from fly ash has been found. 2 o 3 -SiO 2 Airgel reports

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Fly ash and hydrochloric acid are mixed according to the ratio of 0.8:1, acid leaching reaction is carried out at 150°C for 2 hours, and the crude aluminum chloride solution and silica filter cake are obtained by filtration; the crude aluminum chloride solution is passed through LG-726 ion exchange The resin column is used for iron removal, the temperature is 80°C, the speed is 3 times the resin volume / h, the way of passing the column is bottom-in and top-out, and the resin column adopts a single-column method to obtain pure aluminum chloride solution; The sodium is dosed according to the mass ratio of 1:2, reacted at 100°C to obtain a sodium silicate solution; pass the sodium silicate solution through IR-120 strong acidic cation exchange resin to obtain a silicic acid solution with a pH value of 2.4, and pass through the column The speed is 20mL / min; after the impurity-removed aluminum chloride solution and the silicic acid solution are mixed according to the molar rati...

Embodiment 2

[0046] Fly ash and hydrochloric acid are mixed according to the ratio of 0.65:1, acid leaching reaction is carried out at 120°C for 2 hours, and the crude aluminum chloride solution and silica filter cake are obtained by filtration; the crude aluminum chloride solution is passed through LG-726 ion exchange The resin column is used for iron removal, the temperature is 80°C, the speed is 3 times the resin volume / h, the way of passing the column is bottom-in and top-out, and the resin column adopts a single-column method to obtain pure aluminum chloride solution; The sodium is dosed according to the mass ratio of 1:2, reacted at 100°C to obtain a sodium silicate solution; pass the sodium silicate solution through IR-120 strong acidic cation exchange resin to obtain a silicic acid solution with a pH value of 2.6, and pass through the column The speed is 30mL / min; after the impurity-removed aluminum chloride solution and the silicic acid solution are mixed according to the molar rat...

Embodiment 3

[0048] Fly ash and hydrochloric acid are mixed according to the ratio of 0.8:1, acid leaching reaction is carried out at 150°C for 2 hours, and the crude aluminum chloride solution and silica filter cake are obtained by filtration; the crude aluminum chloride solution is passed through LG-726 ion exchange The resin column is used for iron removal, the temperature is 80°C, the speed is 2 times the resin volume / h, the way of passing the column is bottom-in and top-out, and the resin column adopts a single-column method to obtain pure aluminum chloride solution; silica filter cake and hydrogen oxidation The sodium is dosed according to the mass ratio of 1:3, reacted at 90°C to obtain a sodium silicate solution, and the mass fraction of the sodium hydroxide solution is 20%; the sodium silicate solution is passed through IR-120 strongly acidic cation exchange resin to obtain The silicic acid solution with a pH value of 2.6 is passed through the column at a speed of 30mL / min; after t...

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PUM

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Abstract

The invention discloses a method for preparing porous aluminum oxide aerogel from coal ash. The method comprises the following steps: a, carrying out acid leaching; b, removing iron with an aluminum salt solution; c, preparing silicic acid; d, preparing Al2O3-SiO2 gel; e, aging the Al2O3-SiO2 gel; and f, carrying out supercritical drying. Compared with the conventional method, the method disclosed by the invention has the advantages of low energy consumption, cheap raw materials, low production cost, broad technology conditions and the like.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of solid waste, in particular to an Al 2 o 3 -SiO 2 Airgel preparation method. Background technique [0002] Airgel is a gelled material whose dispersion medium is gas. It has a nanoporous structure and is widely used in heat insulation and sound insulation, high-energy particle detectors, drug carriers, catalysts, catalyst carriers, nuclear waste storage, and cosmic dust collection. devices and other fields. So far, people have successfully synthesized many kinds of aerogels, including: C, SiO 2 、TiO 2 and Al 2 o 3 Wait. al 2 o 3 Aerogels undergo phase transitions during high-temperature heating, leading to shrinkage, which limits their application range. Studies have shown that in Al 2 o 3 Si, La, Ba and other elements are introduced into the airgel to form binary or multi-component oxide aerogels, which can increase the Al 2 o 3 High temperature stability of airgel. al ...

Claims

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Application Information

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IPC IPC(8): C01B33/16C01F7/02
Inventor 郭昭华
Owner CHINA SHENHUA ENERGY CO LTD
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