Method for preparing hydrophobic silicon dioxide aerogel

A silicon dioxide and hydrophobic technology, applied in the direction of silicon dioxide, silicon oxide, nanotechnology, etc., can solve the problems of insufficient comprehensive utilization of aluminum extraction tailings, achieve high waste utilization, reduce production costs, and be easy to operate Effect

Active Publication Date: 2017-05-31
CHINA SHENHUA ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method with simple preparation process, sufficient waste utilization and excellent performance of the prepared silica airgel in view of the lack of comprehensive utilization of the tailings of the current fly ash acid method for aluminum extraction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Put the aluminum tailings from fly ash into a muffle furnace, calcinate at 700°C for 1 hour in an air atmosphere, take out and cool, wash with distilled water for solid-liquid separation; take the wet tailings and 4mol / L NaOH solution to solidify Liquid mass ratio 1:7, leaching at 80°C for 4 hours, after hot filtration, take the filtrate and use 4mol / L hydrochloric acid to adjust the pH of the solution to 5, let it stand still to obtain a silica hydrosol, and dry it to obtain a silica gel glue. Soak the obtained silica gel in an organic solvent composed of polyethylene glycol and ethanol with a volume ratio of 1:5 for 12 hours, age and remove impurities. The aged gel was placed in a solution with a volume ratio of trimethylchlorosilane and n-hexane of 1:7 for silylation surface modification for 24 hours, dried at room temperature for 2 hours and then slowly heated to a constant temperature of 80°C Dry for 5 hours to obtain a specific surface area of ​​850m 2 / g, a hyd...

Embodiment 2

[0035] Put the aluminum tailings from fly ash into a muffle furnace, calcinate at 850°C for 2 hours in an air atmosphere, take out and cool, wash with distilled water for solid-liquid separation, take the wet tailings and 6mol / L NaOH solution to solidify Liquid mass ratio 1:5, leaching at 100°C for 3 hours, after hot filtration, take the filtrate and use 6mol / L hydrochloric acid to adjust the pH of the solution to 6, let it stand still to obtain silica hydrosol, and dry it to obtain silica gel glue. Soak the obtained silica gel in an organic solvent composed of polyethylene glycol and ethanol with a volume ratio of 1:8 for 24 hours, age and remove impurities. The aged gel was placed in a solution of trimethylchlorosilane and n-hexane with a volume ratio of 1:8 for silylation surface modification for 12 hours, dried at normal pressure and room temperature for 3 hours, and then slowly heated to a constant temperature of 60°C Dry for 10 hours to obtain a specific surface area of...

Embodiment 3

[0037] Put the fly ash aluminum extraction tailings into the muffle furnace, calcinate at 600°C for 2 hours in the air atmosphere, take out and cool, wash with distilled water for solid-liquid separation, take the wet tailings and 5mol / L Na 2 CO 3 The solution was leached at 60°C for 5 hours at a solid-to-liquid mass ratio of 1:9. After hot filtration, the filtrate was taken to adjust the pH of the solution to 5.5 with 5 mol / L hydrochloric acid, and the silica hydrosol was obtained after standing still. silica gel. Soak the obtained silica gel in a solvent composed of polyethylene glycol and ethanol with a volume ratio of 1:4 for 30 hours, age and remove impurities. The aged gel was placed in a solution of trimethylchlorosilane and n-hexane with a volume ratio of 1:6 for silylation surface modification for 32 hours, dried at normal pressure and room temperature for 4 hours and then slowly heated to a constant temperature of 90°C Dry for 7 hours to obtain a specific surface a...

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Abstract

The invention belongs to the field of comprehensive utilization of solid waste, and discloses a method for preparing hydrophobic silicon dioxide aerogel from fly ash acid process aluminum extraction tailings as raw materials. The method comprises the following steps of performing high-temperature calcination on the fly ash acid process aluminum extraction tailings; performing washing by distilled water; performing strong alkali leaching; then, regulating the pH value of the leaching liquid by inorganic strong acid and performing still standing; performing drying to prepare gel; performing aging, silanization surface modification treatment and washing on the obtained gel; finally, performing normal pressure drying to obtain the hydrophobic silicon dioxide aerogel material with excellent property. The waste is sufficiently utilized; the characteristics of simple process and low cost are realized; the method is applicable to scaled production and application; the prepared aerogel has large specific surface area, high porosity and excellent performance.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of solid waste, and relates to a preparation method of silica airgel. Background technique [0002] Airgel is a lightweight nano-porous amorphous solid material formed by the condensation of colloidal particles. , Optical, thermal and other properties are obviously different from the corresponding macroscopic glassy materials. The particularity of the properties of airgel leads to the broadness of its application prospect. [0003] The most common aerogels are silica aerogels. As a new type of material with controllable structure, silica airgel has many unique properties, such as low refractive index, low elastic modulus, low thermal conductivity, strong adsorption, etc., in Cherenkov It has broad application prospects in many fields such as detectors, catalysts and catalyst carriers, and high-efficiency thermal insulation coatings. At present, silica airgel is mainly prepared by sol-g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/16B82Y40/00
CPCC01B33/16C01P2004/64C01P2006/12C01P2006/16
Inventor 王丽萍王永旺张玮琦郭昭华李超图亚池君洲陈东
Owner CHINA SHENHUA ENERGY CO LTD
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