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Mullite-corundum composite ceramic as well as preparation method and application thereof

A composite ceramic and mullite technology, which can be used in other household appliances, ceramic material production and application, etc., can solve the problems of failure to achieve high-value utilization, complex processes, and differences in ceramics.

Pending Publication Date: 2021-04-27
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

There are still many problems to be solved in the above technologies, such as the low utilization rate of high-alumina fly ash, complicated process, high cost, poor product quality, differences in ceramics produced in different batches, and failure to realize high-value utilization, etc.

Method used

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  • Mullite-corundum composite ceramic as well as preparation method and application thereof
  • Mullite-corundum composite ceramic as well as preparation method and application thereof
  • Mullite-corundum composite ceramic as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0076] The fly ash used in this example is the fly ash of a thermal power plant in the Inner Mongolia Autonomous Region, wherein the content of alumina is 46wt%, and the content of silicon dioxide is 39wt%. The production of mullite-corundum composite ceramics in this example is based on figure 1 process flow.

[0077] (1) fly ash is mixed with the NaOH alkali solution of 2.5mol / L with concentration, the ratio of the volume of described NaOH alkali solution and the quality of fly ash is 10L / g, and the closed reactor carries out activation reaction, and reaction temperature is 95°C, the reaction time is 3 hours, fully stirred, after the reaction is completed, the slurry is filtered, washed, and dried to obtain activated fly ash as a ceramic raw material;

[0078] (2) After sieving the activated fly ash, the activated fly ash with D1<20μm accounts for 50% of the total mass, the activated fly ash with 20μm≤D2<30μm accounts for 40% of the total mass, and the activated fly ash with...

Embodiment 2

[0082] This example adopts the fly ash of a thermal power plant in Shanxi Province, wherein the content of alumina is 52wt%, and the content of silicon dioxide is 42wt%. The production of mullite-corundum composite ceramics in this embodiment is based on figure 1 process flow.

[0083] (1) The fly ash raw material is added in the high-temperature, high-pressure homogeneous reactor, and the fly ash is mixed with the NaOH alkali solution of 5mol / L with a concentration, and the ratio of the volume of the NaOH alkali solution to the mass of the fly ash is 5L / g, closed reactor for activation reaction, the reaction temperature is 150°C, the reaction time is 0.5h, fully stirred, after the reaction is completed, the slurry is filtered, washed, and dried to obtain activated fly ash as a ceramic raw material;

[0084] (2) After the activated fly ash is sieved, the activated fly ash of D1<20 μm accounts for 80% of the total mass, and the activated fly ash of 30 μm≤D3≤50 μm accounts for 2...

Embodiment 3

[0087] This example adopts the fly ash of a thermal power plant in Tianjin, wherein the content of alumina is 42wt%, and the content of silicon dioxide is 36wt%. The production of mullite-corundum composite ceramics in this embodiment is based on figure 1 process flow.

[0088] (1) The fly ash raw material is added in the high temperature and high pressure homogeneous reactor, and the fly ash is mixed with the NaOH alkali solution of 1mol / L with a concentration, and the ratio of the volume of the NaOH alkali solution to the mass of the fly ash is 10L / g, closed reactor for activation reaction, the reaction temperature is 150 °C, the reaction time is 5h, fully stirred, after the reaction is completed, the slurry is filtered, washed, and dried to obtain activated fly ash as a ceramic raw material;

[0089] (2) After sieving the activated fly ash, the activated fly ash with D150μm Fly ash accounts for 10% of the total mass. Mix it, then add water and mix evenly to obtain a materi...

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Abstract

The invention relates to mullite corundum composite ceramic as well as a preparation method and an application thereof. The method comprises the following steps: (1) mixing fly ash with an alkali solution, carrying out alkali activation treatment to obtain activated fly ash, and carrying out particle size grading on the activated fly ash to obtain activated fly ash with different particle sizes; (2) compounding the activated fly ash with different particle sizes to obtain compounded fly ash, and carrying out a molding process on the compounded fly ash to obtain a ceramic blank; and (3) sintering the ceramic body to obtain the mullite-corundum composite ceramic. According to the invention, through the alkali activation modification process, the firing temperature of the ceramic is significantly reduced, the energy consumption in the ceramic production process can be saved in a large range, the fly ash with different particle sizes is compounded, so that the ceramic is close to the most compact state during molding, and the ceramic sintered in the state can achieve significant improvement of the strength of the ceramic.

Description

technical field [0001] The invention belongs to the field of resource utilization of industrial solid waste and the invention of new ceramic materials, and specifically relates to a mullite-corundum composite ceramic, its preparation method and application. Background technique [0002] Fly ash is a kind of solid waste after high-temperature combustion of coal. It has become the largest single pollution source of industrial solid waste. The discharge and storage of a large amount of fly ash is harmful to the environment and human body. The resource utilization of fly ash It means a lot. The high-alumina fly ash is a kind of fly ash unique to my country. It is mainly composed of mullite, corundum, amorphous silica and unburned residual carbon particles. Its chemical composition is alumina and silica. Mainly. At present, the scope of comprehensive utilization of fly ash is developing rapidly, especially in construction and building materials, polymer composite materials, agri...

Claims

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Application Information

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IPC IPC(8): C04B33/135
CPCC04B33/1352C04B2235/6562C04B2235/6567C04B2235/96C04B2235/9692C04B2235/9669Y02P40/60
Inventor 马淑花王天元王晓辉
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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