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Preparation method of SiO2 aerogel

A silicon dioxide and aerogel technology, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problems of reducing the production cost of aerogel, insufficient comprehensive utilization ability of fly ash acid residue, etc., and achieve low density and environmental impact. Small, the effect of reducing production costs

Inactive Publication Date: 2016-11-16
CHINA SHENHUA ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of this, the purpose of the present invention is to provide a method for preparing silica airgel with fly ash acid slag as raw material, and to solve the problem of insufficient comprehensive utilization ability of fly ash acid slag at present, a new method is provided. Fly ash acid slag utilization ideas and technology, at the same time, the process equipment of this method is simple, can greatly reduce SiO 2 Airgel Production Costs

Method used

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  • Preparation method of SiO2 aerogel
  • Preparation method of SiO2 aerogel

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preparation example Construction

[0037] The preparation embodiment of fly ash acid slag

[0038] The raw material is circulating fluidized bed pulverized coal produced by a thermal power plant, and its chemical composition is shown in Table 1.

[0039] Table 1 CFB fly ash chemical composition (wt%)

[0040]

[0041]

[0042] Get the fluidized bed fly ash, pulverize to 200 orders, add water and make the slurry that solid content is 33wt%, use vertical ring magnetic separator (referring to Chinese patent CN102145905A, and its whole content is introduced into this paper), at field strength of Magnetic separation under 15,000 GS twice, obtain the filter cake that solid content is 37.5wt% after the press filtration of plate and frame filter press; In described filter cake, add the industrial hydrochloric acid that concentration is 28wt% to carry out acid dissolution reaction, in hydrochloric acid The molar ratio of HCl to alumina in fly ash is 5:1, the reaction temperature is 150°C, the reaction pressure is...

Embodiment 1

[0050] Mix 1kg of residue with 5L of sodium hydroxide (mass fraction is 15%) solution, place in a reaction kettle, set the reaction temperature to 90°C, and the reaction time to be 120min; obtain the filtrate after filtration, pass the filtrate through strong acid benzene Ethylene cation exchange resin to obtain silicic acid with a pH value of 2 to 3, then dissolve P123 in ethanol solution, and then slowly add P123 solution to the silicic acid solution under stirring conditions, the mass ratio of silicic acid to P123 is 1.3, stir for 3 hours, use 1mol / l ammonia solution to adjust the pH of the solution to 5, stir for 1min, and after the reaction is over, let the reactants stand still to produce SiO 2 Hydrogel; after the obtained hydrogel is left to stand and aged in water for 24 hours, soak the prepared gel with n-hexane for 24 hours, then move the prepared gel into a drying oven, keep the temperature at 70°C for 4 hours, and then put the prepared gel Place in ethanol solution...

Embodiment 2

[0053] Mix 1kg of residue with 5L of sodium hydroxide (mass fraction is 15%) solution, place in a reaction kettle, set the reaction temperature to 90°C, and the reaction time to be 120min; obtain the filtrate after filtration, pass the filtrate through strong acid benzene Ethylene cation exchange resin to obtain silicic acid with a pH value of 2 to 3, then dissolve P123 in a solution of ethanol and hydrochloric acid, and then slowly add P123 solution to the silicic acid solution under stirring conditions, the mixture of silicic acid and P123 The mass ratio is 1.3, stirred for 3 hours, the pH of the solution is adjusted to 5 with 1mol / l ammonia water, stirred for 1 minute, and the hydrosol is obtained after the reaction is completed; the obtained hydrogel is aged for 24 hours to obtain a gel, soaked in n-hexane Prepare the gel for 24 hours, then move the prepared gel to a drying oven, keep the temperature at 70°C for 4h, then place the prepared gel in an ethanol solution acidifi...

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Abstract

The invention discloses a method for preparing silicon dioxide airgel. The acid slag of fly ash is alkali-dissolved to obtain a sodium silicate solution; then, SiO is obtained through resin exchange and adding a template agent. 2 hydrosol; then the hydrosol is left to age to form a hydrogel, and then the gel is soaked in n-hexane for solvent replacement. After the solvent replacement, the template agent is removed; finally, the gel surface is treated with a silane coupling agent. After modification and drying, SiO can be obtained 2 airgel. In this paper, the solid waste fly ash acid slag is used as the raw material instead of the expensive organosilicon compound, and the templating agent is added at the same time, and the ordered mesoporous SiO can be prepared by the method of normal pressure drying or vacuum drying and surface modification. 2 Airgel not only greatly reduces the production cost and equipment cost, but also improves the safety of the drying process, and the resulting product has excellent performance.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of solid waste, and in particular relates to a method for preparing silica airgel by using fly ash acid slag as a raw material. Background technique [0002] SiO 2 Airgel is a new type of amorphous solid-state nanomaterial that is aggregated by nanoscale particles and uses air as the dispersion medium. The unique properties of this new material mainly include high transparency in the visible light region, low thermal conductivity, low sound velocity, and high specific surface area. Based on these properties, SiO 2 Aerogels are widely used in high-efficiency thermal insulation systems, acoustic impedance and radioluminescent devices, liquid rocket propulsion, and catalyst supports. [0003] SiO 2 The traditional synthesis method of airgel is to use organic alkoxide as silicon source, adopt sol-gel process, and combine supercritical drying to prepare. However, the traditional process do...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/16
CPCC01B33/16C01P2006/10C01P2006/12C01P2006/14C01P2006/16
Inventor 池君洲陈东魏存弟蒋引珊王连蒙高钱王丽萍夏俊鑫张小东夏茂盛
Owner CHINA SHENHUA ENERGY CO LTD
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