Method for preparing nano mullite powder from coal-based kaolin

A technology for coal-based kaolin and mullite powder, which is applied in the field of nanomaterials or ceramic materials, can solve the problems of no single-phase nanomullite powder, etc., and achieves the effects of short cycle, easy availability and uniform crystal size.

Inactive Publication Date: 2012-09-19
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] So far, there is still no literature report on the prep

Method used

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  • Method for preparing nano mullite powder from coal-based kaolin
  • Method for preparing nano mullite powder from coal-based kaolin
  • Method for preparing nano mullite powder from coal-based kaolin

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0034] Example 1

[0035] Activated kaolin: Using kaolin as the raw material, the temperature is raised to 1000°C at a temperature rise rate of 10°C / min, and then to 1400°C at a temperature rise rate of 5°C / min. After keeping it for 2 hours, it is naturally cooled.

[0036] Take 10g of activated kaolin as a reference, take 16g of NaOH and 100mL of distilled water; put the activated kaolin into a beaker containing NaOH solution and stir with a glass rod; seal the beaker on a magnetic heating stirrer for stirring and heating; When the temperature rises to 100°C, move the beaker to a water bath at 100°C for constant temperature hydrothermal reaction; take out the beaker after 4h, fully wash the powder in the beaker until it is neutral, vacuum and filter at 105°C After being completely dried, nano-mullite powder can be obtained.

Example Embodiment

[0037] Example 2

[0038] Activated kaolin: Using kaolin as the raw material, the temperature is raised to 1000°C at a temperature rise rate of 10°C / min, and then to 1400°C at a temperature rise rate of 5°C / min. After keeping it for 2 hours, it is naturally cooled.

[0039] Take 10g of activated kaolin as a benchmark, take 12g of NaOH and 100mL of distilled water; put the activated kaolin into a beaker containing NaOH solution and stir with a glass rod; seal the beaker on a magnetic heating stirrer for stirring and heating; When the temperature rises to 80°C, move the beaker to a water bath at 80°C for constant-temperature hydrothermal reaction; take out the beaker after 5h, fully wash the powder in the beaker until it is neutral, vacuum and filter at 105°C After being completely dried, nano-mullite powder can be obtained.

Example Embodiment

[0040] Example 3

[0041] Activated kaolin: Using kaolin as the raw material, the temperature is raised to 1000°C at a temperature rise rate of 10°C / min, and then to 1400°C at a temperature rise rate of 5°C / min. After keeping it for 2 hours, it is naturally cooled.

[0042] Take 10g of activated kaolin as a reference, take 16g of NaOH and 100mL of distilled water; put the activated kaolin into a beaker containing NaOH solution and stir with a glass rod; seal the beaker on a magnetic heating stirrer for stirring and heating; When the temperature rises to 100°C, move the beaker to a 100°C water bath for constant temperature hydrothermal reaction; after 3 hours, take out the beaker, fully wash the powder in the beaker until it is neutral, vacuum and filter it at 105°C After being completely dried, nano-mullite powder can be obtained.

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Abstract

The invention discloses a method for preparing nano mullite powder from coal-based kaolin, which comprises the following steps: calcining to activate the raw material coal-based kaolin, and carrying out alkali fusion reaction to prepare the nano mullite powder. Compared with the existing preparation method, the product prepared by the method disclosed by the invention is single-phase nano mullite powder, the raw material is natural mineral which is cheap and accessible, and the invention has the advantages of simple equipment and short period, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a method for preparing nano-mullite powder by using coal series kaolin, which belongs to the technical field of nano-materials or ceramic materials. Background technique [0002] Mullite is an aluminate mineral of aluminum, which is SiO 2 ~Al 2 o 3 It is the only crystalline compound that exists stably in the system under normal pressure. Mullite has many excellent physical properties, such as low expansion coefficient, low thermal conductivity, low creep, low dielectric constant, high thermal shock resistance and high strength, etc. It can be used not only as engineering materials, but also as advanced refractory materials Widely used in metallurgy, glass, ceramics, chemistry, electric power, national defense, gas and cement industries. [0003] However, there is no natural mullite mine with economic value in the world, and all the mullite needed by industry is artificially synthesized mullite. [0004] Nano mullite not o...

Claims

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Application Information

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IPC IPC(8): C01B33/26C04B35/185C04B35/626B82Y40/00
Inventor 童玲欣李金洪王相
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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