A kind of preparation of sio from fly ash 2 -al 2 o 3 Method for compounding aerogel materials

A technology of composite airgel and fly ash, applied in the field of mesoporous materials, achieves the effect of low cost, short process and short process

Active Publication Date: 2021-06-11
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • A kind of preparation of sio from fly ash <sub>2</sub> -al <sub>2</sub> o <sub>3</sub> Method for compounding aerogel materials
  • A kind of preparation of sio from fly ash <sub>2</sub> -al <sub>2</sub> o <sub>3</sub> Method for compounding aerogel materials
  • A kind of preparation of sio from fly ash <sub>2</sub> -al <sub>2</sub> o <sub>3</sub> Method for compounding aerogel materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1 (see the process flow figure 2 )

[0032] (1) Mix the fly ash and sodium hydroxide (mass ratio is 1:0.8) uniformly, place it in a muffle furnace, and calcinate at 350°C for 2 hours.

[0033] (2) Grind the alkali fusion mixture obtained in step (1), take 5 g of the alkali fusion mixture, add 30 ml of hydrochloric acid (5 mol / L) and 40 ml of deionized water, and stir until the reaction is complete.

[0034] (3) Filter the mixed solution in step (2) to obtain a solution containing silicon and aluminum.

[0035] (4) Ammonia water (0.25mol / L) was added to the solution obtained in step (3), and the pH of the solution was controlled to be 2.7.

[0036] (5) After aging the gel obtained in step (4) for 1 day, wash it twice with deionized water.

[0037] (6) The gel obtained in step (5) is replaced with anhydrous ethanol for solvent replacement, and dried in an oven at 45° C. for 3 hours and at 75° C. for 12 hours.

Embodiment 2

[0038] Example 2 (see the process flow figure 2 )

[0039] (1) Mix the fly ash and sodium hydroxide (mass ratio is 1:1) evenly, place it in a muffle furnace, and calcine at 400 ° C for 1.5 hours.

[0040] (2) Grind the alkali fusion mixture obtained in step (1), take 6 g of the alkali fusion mixture, add 25 ml of hydrochloric acid (5 mol / L) and 30 ml of deionized water, and stir until the reaction is complete.

[0041] (3) Filter the mixed solution in step (2) to obtain a solution containing silicon and aluminum.

[0042] (4) Ammonia water (0.35mol / L) was added to the solution obtained in step (3), and the pH of the solution was controlled to be 2.9.

[0043] (5) After aging the gel obtained in step (4) for 2 days, wash it three times with deionized water.

[0044] (6) The gel obtained in step (5) is replaced with anhydrous ethanol for solvent replacement, and dried in an oven at 45° C. for 3 hours, 65° C. for 12 hours, and 75° C. for 12 hours.

Embodiment 3

[0045] Example 3 (see the process flow figure 2 )

[0046] (1) Mix the fly ash and sodium hydroxide (mass ratio is 1:1.2) evenly, place it in a muffle furnace, and calcine it at 500°C for 1 hour.

[0047] (2) Grind the alkali fusion mixture obtained in step (1), take 4 g of the alkali fusion mixture, add 35 ml of hydrochloric acid (5 mol / L) and 35 ml of deionized water, and stir until the reaction is complete.

[0048] (3) Filter the mixed solution in step (2) to obtain a solution containing silicon and aluminum.

[0049] (4) Ammonia water (0.5mol / L) was added to the solution obtained in step (3), and the pH of the solution was controlled to be 3.1.

[0050] (5) After aging the gel obtained in step (4) for 3 days, wash with deionized water 4 times.

[0051] (6) The gel obtained in step (5) was replaced by anhydrous ethanol, and dried in an oven at 45°C for 3 hours, 55°C for 6 hours, 65°C for 12 hours, and 75°C for 12 hours.

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Abstract

A preparation of SiO from fly ash 2 ‑Al 2 o 3 The method for composite airgel belongs to the field of mesoporous materials. Using fly ash as raw material, by mixing fly ash and sodium hydroxide evenly, calcining in a muffle furnace for a certain period of time to obtain an alkali fusion mixture, mixing and stirring the alkali fusion mixture with hydrochloric acid solution, and separating solid and liquid to obtain silicon, aluminum liquid phase; at room temperature, under the condition of constant stirring, ammonia water is added dropwise to the liquid phase containing silicon and aluminum to promote the liquid phase to undergo a gel reaction to obtain a wet gel; after aging, wash with deionized water, solvent replacement and Dry under normal pressure to get SiO 2 ‑Al 2 o 3 Composite airgel. In the whole technological process of the present invention, the solid waste fly ash is utilized with high added value; the cost is low, the process is short, and the whole preparation cycle only needs 3 days; the synthesized SiO 2 ‑Al 2 o 3 The specific surface area of ​​the composite airgel is about 900m 2 / g; After calcination at 900°C for 2 hours, it still maintains an amorphous structure and has good thermal stability.

Description

technical field [0001] The invention belongs to the field of mesoporous materials, in particular to the synthesis of SiO by using fly ash as a raw material 2 -Al 2 O 3 Methods of compounding aerogel materials. Background technique [0002] Aerogel is a porous solid material formed by a three-dimensional network structure of nanoparticles and filled with air. The porosity can reach 80%-99.8%, the typical pore size is 1-100nm, and the specific surface area is usually 200-1200m 2 / g, the density varies from 0.003-0.5g / m 3 ((1) A. Soleimani Dorcheh, M.H. Abbasi, Journal of Materials Processing Tech, 2008, 199(1-3): 10-26.). Due to these characteristics, aerogels have great application potential in thermal insulation materials, thermal insulation materials, separation materials, and low dielectric constant materials. [0003] with SiO 2 or Al 2 O 3 Aerogel compared to Al 2 O 3 -SiO 2 The composite aerogel has better high temperature performance and thermal stability, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/158C01F7/06
CPCC01B33/1585C01F7/0693C01P2004/82
Inventor 郭敏申满满张梅
Owner UNIV OF SCI & TECH BEIJING
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