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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

AI Technical Summary

Problems solved by technology

[0008] So far, there is still no literature report on the preparation of single-phase nano-mullite powder from natural ores.

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

Embodiment 1

[0035] Activated kaolin: use kaolin as raw material, raise the temperature up to 1000°C at a rate of 10°C / min, then increase to 1400°C at a rate of 5°C / min, keep warm for 2 hours and then cool naturally.

[0036] Take 10 g of activated kaolin as a benchmark, take 16 g of NaOH and 100 mL of distilled water; put the activated kaolin into a beaker equipped with NaOH solution, and stir with a glass rod; the beaker is sealed and placed on a magnetic heating stirrer to stir and heat up; When the temperature rises to 100°C, move the beaker to a water bath at 100°C for a constant temperature hydrothermal reaction; take out the beaker after 4 hours, fully wash the powder in the beaker until it is neutral, vacuum filter and store at 105°C Nano mullite powder can be obtained after complete drying.

Embodiment 2

[0038] Activated kaolin: use kaolin as raw material, raise the temperature up to 1000°C at a rate of 10°C / min, then increase to 1400°C at a rate of 5°C / min, keep warm for 2 hours and then cool naturally.

[0039]Taking 10 g of activated kaolin as a benchmark, take 12 g of NaOH and 100 mL of distilled water; put the activated kaolin into a beaker equipped with NaOH solution and stir with a glass rod; the beaker is sealed and placed on a magnetic heating stirrer to stir and heat up; 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 5 hours, fully wash the powder in the beaker until it is neutral, vacuum filter and dry at 105°C Nano mullite powder can be obtained after complete drying.

Embodiment 3

[0041] Activated kaolin: use kaolin as raw material, raise the temperature up to 1000°C at a rate of 10°C / min, then increase to 1400°C at a rate of 5°C / min, keep warm for 2 hours and then cool naturally.

[0042] Take 10 g of activated kaolin as a benchmark, take 16 g of NaOH and 100 mL of distilled water; put the activated kaolin into a beaker equipped with NaOH solution, and stir with a glass rod; the beaker is sealed and placed on a magnetic heating stirrer to stir and heat up; When the temperature rises to 100°C, move the beaker to a water bath at 100°C for a constant temperature hydrothermal reaction; take out the beaker after 3 hours, fully wash the powder in the beaker until it is neutral, vacuum filter and dry at 105°C Nano mullite powder can be obtained after complete drying.

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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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