A building thermal insulation material prepared by fly ash aerogelization

A technology for building thermal insulation and thermal insulation materials, applied in the field of thermal insulation materials for buildings, can solve the problems of uneven thermal insulation effect of materials and high impurity content of silica aerogel, achieve significant market application value, and ensure uniformity of components , the effect of reducing production costs

Inactive Publication Date: 2019-01-18
GUYUAN KAIYUAN ENERGY SAVING BUILDING MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the current process of using fly ash to prepare silica airgel, there is no corresponding purification treatment for fly ash. Most of them directly react fly ash with alkali to obtain silica gel, and then pass Silica airgel is obtained by drying under normal pressure, which will lead to high impurity content in the silica airgel, resulting in uneven heat insulation effect of the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Add primary fly ash to industrial waste sulfuric acid, set the temperature of industrial waste sulfuric acid at 30°C, and adjust its pH value to 3-4 under the conditions of stirring speed of 100 rpm, and carry out primary Fly ash surface pretreatment, and then filtered to obtain pretreated fly ash powder, the mass ratio of primary fly ash and industrial waste sulfuric acid is 1:5;

[0027] (2) The pretreated fly ash powder obtained in step (1) is roasted at high temperature, and sintered in a vacuum muffle furnace. During the sintering process, the air pressure of 100 is maintained, the temperature is set to 300°C, and the roasting activation time is set to 10 minutes. After the roasting is completed, through ball mill mechanical grinding, hard steel balls can be used for ball mill mechanical grinding, and the ball milling time is 2 hours to obtain activated fly ash;

[0028] (3) Mix the activated fly ash with the alkali solution in proportion to react at 70°C. The ...

Embodiment 2

[0032] (1) Add secondary fly ash to industrial waste hydrochloric acid, set the temperature of industrial waste hydrochloric acid at 40°C, and adjust its pH value to 3-4 under the conditions of stirring speed of 200 rpm to carry out coal pulverization Ash surface pretreatment, and then filtered to obtain pretreated fly ash powder, the mass ratio of fly ash and industrial waste sulfuric acid is 1:1;

[0033] (2) The pretreated fly ash powder obtained in step (1) is roasted at high temperature and sintered in a vacuum muffle furnace. During the sintering process, the pressure of 300 Pa is maintained, the temperature is set at 400°C, and the roasting activation time is set at 30 minutes. , after the roasting is completed, through the mechanical grinding of the ball mill, the mechanical grinding of the ball mill can adopt stainless steel balls, and the ball milling time is 3 hours to obtain activated fly ash;

[0034](3) Mix the activated fly ash with alkali sodium hydroxide solut...

Embodiment 3

[0038] (1) Add ultra-fine fly ash to industrial waste nitric acid, set the temperature of waste nitric acid to 60°C, and adjust the pH value to 3-4 under the conditions of setting the temperature of waste nitric acid to 60°C and stirring speed to 3-4, and carry out fly ash Surface pretreatment, then obtain pretreated fly ash powder through filtration, the mass ratio of fly ash and waste nitric acid is 5:1;

[0039] (2) The pretreated fly ash powder obtained in step (1) is roasted at high temperature and sintered in a vacuum muffle furnace. During the sintering process, the pressure of 500 Pa is maintained, the temperature is set at 500°C, and the roasting activation time is set at 50 minutes. , after the roasting is completed, through ball mill mechanical grinding, ball mill mechanical grinding can adopt tungsten carbide balls, and the ball milling time is 4 hours to obtain activated fly ash;

[0040] (3) Mix the activated fly ash with the ammonium fluoride solution at 90°C in...

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PUM

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Abstract

The invention provides a building heat preservation and thermal insulation material prepared by aerogelation of flyash. Firstly, the flyash reacts with industrial waste acid, surface pretreatment is conducted on the flyash, impurity ions are dissolved into the industrial waste acid, then repeated high-temperature roasting and alkalization treatment are conducted, gelation is conducted on the surface of the flyash, then a body of the flyash is connected, powder is mutually connected, a network skeleton is formed, and then silicon dioxide aerogel is obtained through a normal-pressure drying reaction. The building heat preservation and thermal insulation material is low in cost, in-situ gelation is conducted on the flyash, the micropore distribution of the obtained heat preservation and thermal insulation material is uniform, and the strength is high; and waste is turned into things of value while the environment pollution problem is solved, and the utilization value of the flyash is increased.

Description

technical field [0001] The invention relates to the field of functional material preparation, in particular to a building thermal insulation material prepared by fly ash aerogelization. Background technique [0002] Airgel is the lightest solid in the world. It is a porous condensed matter with a three-dimensional network structure as a scaffold filled with a gas dispersion medium. Airgel materials have the advantages of large specific surface area, high porosity, low thermal conductivity, low density, and strong doping adsorption capacity. Broad application prospects. The main component of airgel is silica material, and the silicon source used to prepare silica airgel is usually ethyl orthosilicate, polyethoxydisiloxane, methyltrimethoxysilane, tetrachloride Organosilicon compounds such as silicon, which are expensive. Since the main component of fly ash is silica, there are currently invention patents that use fly ash as a silicon source, which greatly reduces the produ...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C04B30/00C04B38/00C04B20/02
CPCC04B20/023C04B30/00C04B2201/32C04B18/08C04B2103/302C04B38/0045C04B38/0074
Inventor陈庆曾军堂陈兵王镭迪
OwnerGUYUAN KAIYUAN ENERGY SAVING BUILDING MATERIAL CO LTD