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Method for preparing high-purity ultrafine Al2O3 powder

A high-purity, powder-based technology, applied in alumina/hydroxide preparation, aluminate/alumina/aluminum hydroxide purification, etc., can solve the problems of incomplete aluminum reaction, long production cycle and high production cost, and achieve Fast response, low cost, and easy operation

Inactive Publication Date: 2012-06-13
NANTONG TADE ELECTRONICS MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN10157511A, CN1374252A respectively reported the process method of preparing high-purity Al2O3 by reacting quaternary ammonium base with aluminum, choline and aluminum; above-mentioned two kinds of methods use expensive organic base in large quantities, and production cost is higher
N101332997A reported a method for preparing high-purity aluminum oxide by hydrolysis of ultrasonically activated metal aluminum; Chinese patent 1121359C reported the use of rapid cooling atomization technology to prepare active aluminum powder, and then carried out hydrolysis reaction to prepare high-purity aluminum oxide powder. method, the above two methods all have the problem of incomplete aluminum reaction and have certain limitations
CN1286724C reported the method of adopting ball milling hydrolysis, using mechanical force to promote the hydrolysis reaction of water and metal aluminum to prepare high-purity aluminum oxide powder. This method has low cost but long production cycle

Method used

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  • Method for preparing high-purity ultrafine Al2O3 powder
  • Method for preparing high-purity ultrafine Al2O3 powder
  • Method for preparing high-purity ultrafine Al2O3 powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Prepare materials according to the following mass percentages:

[0036] Metal aluminum 10%

[0037] Catalyst 0.001%

[0038] Water 89.999%;

[0039] Among them, water is high-purity water, which is water with a resistivity of 12MΩ·cm after ordinary tap water is treated by conventional two-stage reverse osmosis and electronic mixed bed; commercial high-purity aluminum powder with a purity of 99.996% of metallic aluminum The catalyst is a mixed solution of elemental iodine with a purity of 99.995% and commercially available electronic grade ethanol, with a solid-liquid mass ratio of 1:5;

[0040] (2) After mixing the metal aluminum, water and catalyst in step (1), microwave heating is performed under an electromagnetic wave with a power of 300W and a frequency of 1000MHz for 10 minutes, and then cooled to room temperature to generate aluminum hydroxide precipitate and release Hydrogen, using conventional technology for ventilation during heating and cooling;

[0041] (3) The a...

Embodiment 2

[0043] (1) Prepare materials according to the following mass percentages:

[0044] Metal aluminum 5.996%

[0045] Catalyst 0.004%

[0046] Water 94%;

[0047] Among them, the water is high-purity water, which is water with a resistivity of 13MΩ·cm after ordinary tap water is treated by conventional secondary reverse osmosis and electronic mixed bed; the purity of metal aluminum is 99.999%; it is a rolled metal aluminum sheet , And then washed with high-purity water to remove the remaining impurities on the surface; the catalyst is a mixed solution of elemental iodine with a purity of 99.995% and commercially available electronic grade ethanol, with a solid-liquid ratio of 1:8;

[0048] (2) After mixing the metal aluminum, water and catalyst in step (1), microwave heating is carried out under an electromagnetic wave with a power of 500W and a frequency of 2000MHz for 30 minutes, and then cooled to room temperature to generate aluminum hydroxide precipitate and release Hydrogen, using c...

Embodiment 3

[0051] (1) Prepare materials according to the following mass percentages:

[0052] Metal aluminum 8%

[0053] Catalyst 0.002%

[0054] Water 91.998%;

[0055] Among them, the water is high-purity water, which is water with a resistivity of 14MΩ·cm after ordinary tap water is treated by conventional two-stage reverse osmosis and electronic mixed bed; the purity of metal aluminum is 99.997%; it is aluminum foil made by machining , And then washed with high-purity water to remove the remaining impurities on the surface; the catalyst is a mixed solution of elemental iodine with a purity of 99.995% and commercially available electronic grade ethanol, with a solid-liquid ratio of 1:10;

[0056] (2) After mixing the metal aluminum, water and catalyst in step (1), microwave heating is carried out under an electromagnetic wave with a power of 250W and a frequency of 5000MHz for 5 minutes, and then cooled to room temperature to generate aluminum hydroxide precipitate and release Hydrogen, using...

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Abstract

The invention provides a method for preparing high-purity ultrafine Al2O3 powder. The method comprises the following steps of: uniformly mixing metal aluminum, water and a catalyst in a certain ratio, performing microwave heating, cooling to room temperature, obtaining an aluminum hydroxide precipitate, and discharging hydrogen; and washing the aluminum hydroxide precipitate through high-purity water, and performing suction filtration, dehydration and calcination to obtain 4 to 5N high-purity ultrafine Al2O3 powder. In the whole preparation process, a flow is short, a process is simple, the reaction speed is high, energy consumption and cost are low, the purity is easy to control, toxic and harmful gases and liquid are not generated, high-efficiency large-scale production can be performed, and obvious economic benefits and social benefits can be produced.

Description

[0001] Technical field [0002] The present invention relates to high purity ultrafine Al 2 O 3 The preparation method of the powder belongs to the technical field of the preparation of aluminum oxide powder. Background technique [0003] In recent years, high-purity aluminum oxide has been widely used in the production of integrated circuit substrates, transparent high-pressure sodium lamps, tri-color phosphors, functional single crystals, precision instruments and aviation functions due to its good electrical, thermal, mechanical and optical properties. Device. With the development of science and technology, and with the wide application of high-purity aluminum oxide in the technical fields of materials, information, energy, biology, ocean and space, the particle size, purity and uniformity of aluminum oxide powder Higher requirements have been put forward, and the demand for high-purity and ultra-fine aluminum oxide powder is also increasing. [0004] Metal aluminum has high ch...

Claims

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Application Information

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IPC IPC(8): C01F7/42C01F7/46
Inventor 杜信王耀东李文
Owner NANTONG TADE ELECTRONICS MATERIAL TECH
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