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Preparation method of high-purity ultrafine Al2O3 powder

A high-purity, powder-based technology, applied in the preparation of alumina/hydroxide, etc., can solve the problems of complex process and high cost of alumina, and achieve the effects of increased hydrolysis reaction speed, fast movement speed, and shortened reaction process time

Inactive Publication Date: 2014-02-05
NANTONG TADE ELECTRONICS MATERIAL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to overcome the problems of high cost and complex process in the production of alumina in the prior art, the present invention provides a kind of high-purity aluminum as raw material, which is hydrolyzed with strong alkaline ionized water, and the reaction product is calcined at high temperature to prepare high-purity alumina. powder method

Method used

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  • Preparation method of high-purity ultrafine Al2O3 powder
  • Preparation method of high-purity ultrafine Al2O3 powder
  • Preparation method of high-purity ultrafine Al2O3 powder

Examples

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Effect test

Embodiment 1

[0029] A. The ordinary tap water is treated with two-stage reverse osmosis and electronic mixed bed to obtain high-purity water with a resistivity of 12MΩ·cm. Then, in the high-purity water, add an electronic-grade organic base—tetramethylhydroxide at an amount of 0.005mol / L Ammonium, to increase the conductivity of pure water, electrolyze high-purity water to prepare acidic ionized water and strong alkaline ionized water with a pH of 13 respectively;

[0030] B. According to the liquid-solid mass ratio of 7:1, add commercial high-purity metal aluminum powder with a purity of 99.996% (4N) into the strong alkaline ionized water obtained in step A, and heat to 50°C while stirring at a speed of 300 rpm When stirring, make the stirrer rotate forward for 8 minutes, stop for 20 seconds, reverse for 8 minutes, and stop for 20 seconds, and cycle like this; stop heating and stirring until no gas emerges, and then perform solid-liquid separation to obtain a solid product ; In this proces...

Embodiment 2

[0033] A. The ordinary tap water is treated with two-stage reverse osmosis and electronic mixed bed to obtain high-purity water with a resistivity of 13MΩ·cm. Then, in the high-purity water, add an electronic-grade organic base—tetramethylhydroxide in an amount of 0.02mol / L Ammonium to improve the conductivity of pure water, and then electrolyze the high-purity water to prepare acidic ionized water and strong alkaline ionized water with a pH of 12 respectively;

[0034] B. The metal aluminum foil with a purity of ≥99.996% (the metal aluminum foil is rolled) is subjected to the following treatment: wash with the acidic ionized water obtained in step A to remove a small amount of impurity iron remaining on the surface during the processing, and then use the alkali obtained in step A Neutralize with ionized water and wash with pure water; add the treated metal aluminum foil with a purity of ≥99.996% to the strong alkaline ionized water obtained in step A according to the liquid-sol...

Embodiment 3

[0037] A. The ordinary tap water is treated with two-stage reverse osmosis and electronic mixed bed to obtain high-purity water with a resistivity of 15MΩ·cm, and then the high-purity water is used as an electrolyte to add electronic grade organic alkali tetramethylammonium hydroxide at 0.08mol / L to improve the pure water Conductivity, then electrolyze high-purity water to produce acidic ionized water and strong alkaline ionized water with a pH of 14 respectively;

[0038] B. The metal aluminum scraps with a purity of ≥99.999% (the metal aluminum scraps are made by machining and turning) are subjected to the following treatments: wash with the acidic ionized water obtained in step A to remove a small amount of impurity iron remaining on the surface during the processing, and then use The alkaline ionized water obtained in step A is neutralized in water, and then washed with pure water; according to the liquid-solid mass ratio of 4.6:1, the treated aluminum metal scraps with a pu...

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Abstract

The invention provides a preparation method of high-purity ultrafine Al2O3 powder. The preparation method of the high-purity ultrafine Al2O3 powder includes: using high purity water as electrolyte, adding 0.005-0.08mol / L of high purity water into electronic-grade organic base, namely tetramethylammonium hydroxide, and electrolyzing the high purity water to respectively obtain acidic ionized water and highly basic ionized water with pH value more than 12; adding aluminum into the highly basic ionized water, heating under stirring, stopping heating till no gas emerges, and performing solid-liquid separation to obtain a solid product; cleaning and leaching the solid product by the high purity water, dewatering, and calcining the solid product to obtain the high-purity ultrafine Al2O3 powder. The ultrafine Al2O3 powder is high in purity. The whole preparation process is short in flow, purity is easy to control, the process is simple, the cost is low, no toxic and harmful gas or liquid is discharged, and scale production can be achieved.

Description

Technical field [0001] The invention relates to a high-purity ultrafine Al 2 O 3 The powder preparation method specifically relates to a method for preparing high-purity ultrafine alumina powder by reacting strong alkaline ionized water with high-purity aluminum. Background technique [0002] As one of the special functional materials, high-purity ultra-fine alumina has high strength, high hardness, abrasion resistance, corrosion resistance, high temperature resistance, oxidation resistance, good insulation, large surface area, re-operation at low temperatures, deformation and easy forming, etc. The advantages have been widely used in artificial crystals, precision ceramics, catalysts, and rare earth trichromatic phosphors for lamps. With the development of science and technology, higher requirements are put forward for the particle size, purity and uniformity of alumina powder, and the demand for high-purity and ultra-fine alumina powder is also increasing. [0003] At present, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/42
Inventor 王耀东杜信李文
Owner NANTONG TADE ELECTRONICS MATERIAL TECH
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