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Preparation method of silicon-aluminum composite aerogel powder

A composite airgel and silica-alumina technology, which is applied in the direction of airgel preparation, silicon compounds, chemical instruments and methods, etc., can solve the problem that the pH value of strong alkali sodium hydroxide is not easy to control, affects the quality of airgel, and cannot be salted Ion removal and other issues, to achieve the effect of shortening the reaction process time, high porosity and specific surface area, and reducing costs

Active Publication Date: 2018-05-08
UNIV OF SCI & TECH LIAONING
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  • Abstract
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  • Claims
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Problems solved by technology

The disadvantage of this method is that because the chloride ions introduced into the silica-alumina gel using hydrochloric acid need 24-48h of water washing to remove chlorine, the process time is prolonged and water resources are wasted.
The disadvantage of this method is that the sulfuric acid catalyzed method introduces sodium sulfate into the silica-alumina gel, and even washing with water for 72 hours cannot completely remove the salt ions in the gel.
The disadvantage of this method is that the pH value of the strong base sodium hydroxide selected by the catalytic method is not easy to control, and the addition of sodium hydroxide will also affect the quality of the airgel

Method used

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Embodiment 1

[0035] A method for preparing silicon-aluminum composite airgel powder by drying under normal pressure with fly ash as raw material, such as figure 1 As shown, the following steps are included: the solid waste fly ash of the coal-fired power plant is pretreated in a high-temperature box-type resistance furnace at 750 ° C for 3 hours. Weigh 10 g of activated fly ash, add 100 mL of 5 mol / L hydrochloric acid solution, and react for 2 hours in a boiling water bath. After the reaction, the solution was subjected to suction filtration, and the filtrate was a yellow transparent liquid, which was recovered for processing, and the filter residue was retained. According to the mass ratio of sodium hydroxide and the first acid stripping filter residue of 0.4, 15wt.% sodium hydroxide solution and the filter residue were subjected to alkali dissolution reaction for 3 hours, and the above reaction was followed by secondary suction filtration, and the filtrate was retained. The filtrate was ...

Embodiment 2

[0037] A method for preparing silicon-aluminum composite airgel powder by drying under normal pressure with fly ash as raw material, such as figure 1 As shown, the following steps are included: the solid waste fly ash of a coal-fired power plant is pretreated in a high-temperature box-type resistance furnace at 700 ° C for 2 hours. Weigh 10 g of activated fly ash, add 100 mL of 4 mol / L hydrochloric acid solution, and react for 3 hours in a boiling water bath. After the reaction, the solution was subjected to suction filtration, and the filtrate was a yellow transparent liquid, which was recovered for processing, and the filter residue was retained. According to the mass ratio of sodium hydroxide and the first acid stripping filter residue of 0.2, 20wt.% sodium hydroxide solution and the filter residue were subjected to alkali dissolution reaction for 3 hours, and the above reaction was followed by secondary suction filtration, and the filtrate was retained. The filtrate was a ...

Embodiment 3

[0039] A method for preparing silicon-aluminum composite airgel powder by drying under normal pressure with fly ash as raw material, such as figure 1 As shown, the following steps are included: the solid waste fly ash of the coal-fired power plant is pretreated in a high-temperature box-type resistance furnace at 750 ° C for 3 hours. Weigh 10 g of activated fly ash, add 100 mL of 6 mol / L hydrochloric acid solution, and react for 3 hours under boiling water bath conditions. After the reaction, the solution was subjected to suction filtration, and the filtrate was a yellow transparent liquid, which was recovered for processing, and the filter residue was retained. According to the mass ratio of sodium hydroxide and the first acid stripping filter residue of 0.6, 10wt.% sodium hydroxide solution and the filter residue were subjected to alkali dissolution reaction for 2 hours, and the above reaction was followed by secondary suction filtration, and the filtrate was retained. The f...

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Abstract

The invention discloses a preparation method of silicon-aluminum composite aerogel powder. The preparation method concretely comprises the following steps of (1) mixing coal ash subjected to high temperature activation treatment and a hydrochloric acid solution to perform acid dissolution reaction, performing suction filtration on an obtained reaction solution, mixing obtained filter residues andan inorganic alkaline solution to perform alkaline dissolution reaction, and performing suction filtration; (2) adopting hydrogen-type cation exchange resin to perform exchange on an obtained silicoaluminate salt solution until a pH value of the solution is 2-3, then adopting ammonia water to catalyze an obtained silicoaluminate solution to perform catalysis until a pH value is 5-7, and then performing ageing; (3) adopting ethanol to perform solvent replacement on obtained silicon-aluminum hydrogel to obtain silicon-aluminum alcogel; (4) adopting a mixed solution of hexamethyldisiloxane and the ethanol to perform surface modification on the silicon-aluminum alcogel; and (5) performing ambient pressure drying, crushing and screening on the silicon-aluminum gel with the hydrophobic surface to obtain the silicon-aluminum composite aerogel powder. The preparation method has the advantages of wide source of raw materials, low cost, simpleness in preparation technology, suitability for industrial production in large scale and the like.

Description

technical field [0001] The invention belongs to the technical field of silica-alumina airgel preparation, and in particular relates to a method for preparing high value-added products using power plant fly ash as a raw material, that is, using the solid waste fly ash of a coal-fired power plant to prepare a heat-insulating, A method of silicon-aluminum composite airgel powder for sound-absorbing materials. Background technique [0002] Fly ash is a by-product of coal-fired power plants, and the annual discharge of fly ash in my country is about 600-700 million tons. The stacking of fly ash not only occupies land, but also causes serious air dust pollution, soil pollution and water resource pollution, which has caused huge pressure on my country's national economic construction and ecological environment. Therefore, the research and development of the comprehensive utilization technology of fly ash, especially the high-end utilization technology is a major issue facing my co...

Claims

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Application Information

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IPC IPC(8): B01J13/00C01B33/158
CPCB01J13/0091C01B33/1585
Inventor 徐静余江龙黄峰赵小蕙张春霞田露窦金孝
Owner UNIV OF SCI & TECH LIAONING
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