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Method for preparing mullite by using modified kaolin clay

A kaolin and mullite technology, which is applied in the field of ceramic material preparation, can solve problems such as reducing the firing temperature of ceramics, and achieve the effects of lowering the firing temperature, destroying the structural order, and improving product quality.

Active Publication Date: 2013-06-26
广东宝丰陶瓷科技发展股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing mullite with modified kaolin at low temperature, aiming at the current problem of preparing mullite from modified kaolin, which reduces the firing temperature of ceramics, saves energy consumption and reduces Reduced production costs and pollutant emissions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Add citric acid and sodium fluoride to water to prepare a modified aqueous solution containing 20% ​​citric acid and 1% sodium fluoride by weight percentage, and add kaolin to the modified solution at a solid-to-liquid weight ratio of 1:1.5 Soak in the solution for 36 hours, filter the solution with suction, wash with distilled water several times, dry at 80° C., and grind into powder to obtain modified kaolin. The modified kaolin is put into a high-temperature furnace, calcined at 870°C, and the high-temperature holding time is 30 minutes to generate acicular mullite.

Embodiment 2

[0019] Add oxalic acid and potassium fluoride to water to prepare a modified aqueous solution containing 10% oxalic acid and 2% potassium fluoride by weight percentage, and add kaolin to the modified solution at a solid-to-liquid weight ratio of 1:2.0 , soaked for 48 hours, suction filtered the solution, washed with distilled water several times, dried at 80°C, and ground into powder to obtain modified kaolin. The modified kaolin is put into a high-temperature furnace, calcined at 850°C, and held at high temperature for 45 minutes to generate acicular mullite.

Embodiment 3

[0021] Add acetic acid and ammonium fluoride to water to prepare a modified aqueous solution containing 2% acetic acid and 5% ammonium fluoride by weight percentage, and add kaolin to the modified solution at a solid-to-liquid weight ratio of 1:2.5 , soaked for 48 hours, suction filtered the solution, washed with distilled water several times, dried at 80°C, and ground into powder to obtain modified kaolin. Put the modified kaolin into a high-temperature furnace, calcinate at 930°C, and hold the high temperature for 110 minutes to obtain acicular mullite.

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Abstract

The invention relates to a method for preparing mullite by using modified kaolin clay, and aims at providing a mullite preparation method which is characterized in that the ceramic firing temperature is reduced, the energy consumption is saved, and the production cost and the pollutant discharge are reduced. The key points are that the method successively comprises the following steps of: 1) preparing a modified water solution containing 2-20wt% of organic acid and 1-5wt% of fluoride; 2) adding one part by mass of kaolin clay into 1.3-1.5 parts by mass of modified water solution prepared in the step 1 for immersing so as to obtain modified kaolin clay; and 3) placing modified kaolin clay obtained from the step 2 into a high temperature furnace for calcination so as to obtain nano-scale needle-shaped mullite. The invention belongs to the technical field of ceramic material preparation.

Description

technical field [0001] The invention relates to a method for preparing mullite, in particular to a method for preparing mullite at low temperature with modified kaolin; it belongs to the technical field of ceramic material preparation. Background technique [0002] Mullite, especially relates to a method for preparing mullite from modified kaolin at low temperature. materials etc. In the production of silicate materials such as ceramics, due to the large silicon-oxygen bond energy of the raw silicate minerals and the high firing temperature, a large amount of energy is required, which not only increases the production cost, but also pollutes the environment. The main crystal phase of traditional ceramics is mullite, which is formed by clay minerals through high-temperature thermal decomposition reaction. The temperature at which mullite is first formed is above 1150°C. The higher formation temperature of mullite directly leads to higher firing temperature of ceramics. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/185C04B35/626
Inventor 张志杰谭越郭福琼杨云山郭志山
Owner 广东宝丰陶瓷科技发展股份有限公司
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