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Method for preparing mullite-corundum ceramic from high-aluminum fly ash

A technology for high-alumina fly ash and mullite, which is applied in the field of preparing mullite-corundum ceramics, can solve the problems of low addition amount of fly ash, difficulty in realizing resource utilization of fly ash, etc. The effect of good comprehensive practical performance and large stockpile

Inactive Publication Date: 2020-03-03
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Although there are many methods for preparing mullite-corundum products using fly ash as raw materials in the prior art, there are generally problems such as too low amount of fly ash and the need to add additional additives. Maximize resource utilization

Method used

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  • Method for preparing mullite-corundum ceramic from high-aluminum fly ash

Examples

Experimental program
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Effect test

Embodiment 1

[0047] In this example, the fly ash of a thermal power plant in the Inner Mongolia Autonomous Region is used as a raw material, and the mullite-corundum ceramics are prepared according to the following steps:

[0048] (1) Ball mill the high-aluminum fly ash to -200 mesh, then add it to a high-temperature and high-pressure reactor, mix it with a NaOH solution with a concentration of 1mol / L according to a liquid-solid ratio of 2:1, and close the reactor to stir for activation reaction , the reaction temperature is 150°C, and the reaction time is 24h. After the reaction is completed, the slurry is filtered, washed, and dried to obtain activated fly ash;

[0049] (2) Add water to the activated fly ash obtained in step (1), control the moisture content of the activated fly ash to 15wt%, then place the powder in the mold and utilize a tablet press to form, the molding pressure is 10MPa, dry After getting the green body;

[0050] (3) Put the green body obtained in step (2) into an e...

Embodiment 2

[0053] In this example, the fly ash of a thermal power plant in Shanxi Province is used as a raw material, and the mullite-corundum ceramics are prepared according to the following steps:

[0054] (1) Ball mill the high-aluminum fly ash to -200 mesh, then add it to a high-temperature and high-pressure reactor, mix it with a NaOH solution with a concentration of 5mol / L according to a liquid-solid ratio of 2:1, and close the reactor to stir for activation reaction , the reaction temperature is 50°C, and the reaction time is 10h. After the reaction is completed, the slurry is filtered, washed, and dried to obtain activated fly ash;

[0055] (2) Add water to the activated fly ash obtained in step (1), control the moisture content of the activated fly ash to 10wt%, then place the powder in the mold and utilize a tablet press to form, the molding pressure is 25MPa, dry After getting the green body;

[0056] (3) Place the green body obtained in step (2) in an electric heating furnac...

Embodiment 3

[0059] In this example, the fly ash of a thermal power plant in Tianjin is used as a raw material, and the mullite-corundum ceramics are prepared according to the following steps:

[0060] (1) Ball mill the high-aluminum fly ash to -200 mesh, then add it to a high-temperature and high-pressure reactor, mix it with a NaOH solution with a concentration of 2mol / L according to a liquid-solid ratio of 10:1, close the reactor and stir for activation reaction , the reaction temperature is 90°C, and the reaction time is 3h. After the reaction is completed, the slurry is filtered, washed, and dried to obtain activated fly ash;

[0061] (2) Add water to the activated fly ash obtained in step (1), control the moisture content of the activated fly ash to 8wt%, then place the powder in the mold and utilize a tablet press to form, the molding pressure is 50MPa, dry After getting the green body;

[0062] (3) Place the green body obtained in step (2) in an electric heating furnace for sinter...

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Abstract

The invention provides a method for preparing mullite-corundum ceramic from high-aluminum fly ash. The method comprises the following steps: mixing high-aluminum fly ash and an alkaline solution, andheating to carry out an activation reaction to obtain activated fly ash; carrying out pressure molding on the activated fly ash in a mold to obtain a raw billet; and sintering the raw billet to obtainthe mullite-corundum ceramic product. According to the invention, high-aluminum fly ash is used as a raw material, and is sintered after being subjected to alkali activation modification, so that a ceramic product with excellent mechanical properties and excellent fire resistance is obtained; compared with the traditional preparation process, the method of the invention has characteristics of wide raw material source, low cost, simple process, low energy consumption and the like, only uses the fly ash as the raw material to completely replace the traditional ceramic raw material so as to significantly reduce the mullite-corundum ceramic production cost, can achieve the resource utilization of industrial solid waste, integrates economic and environmental benefits, and is suitable for large-scale popularization.

Description

technical field [0001] The invention relates to the field of resource utilization of industrial solid waste and the invention of new ceramic materials, in particular to a method for preparing mullite-corundum ceramics by using high-alumina fly ash. Background technique [0002] Fly ash is a solid waste after high-temperature combustion of coal powder in power plants, and high-alumina fly ash is a kind of fly ash unique to my country, which is mainly composed of mullite, corundum, amorphous silica and unburned Composed of carbon residue particles, its chemical composition is mainly alumina and silica. High aluminum fly ash is not only a solid waste, but also an available resource. At present, the scope of comprehensive utilization of fly ash is developing rapidly, especially in construction and building materials, polymer composite materials, agriculture, forestry and animal husbandry, etc., but it is mainly extensive and simple reuse, and refined and high value-added industr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/185C04B35/10C04B35/622C04B35/626
CPCC04B35/10C04B35/185C04B35/62204C04B35/62605C04B2235/6562C04B2235/6567C04B2235/96
Inventor 马淑花罗扬王晓辉郑诗礼
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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