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Method for preparing superfine alumina powder with non-water precipitation process

A technology of alumina superfine powder and process, applied in the direction of alumina/hydroxide preparation, etc., can solve the problems of long production cycle, difficult industrialization, high energy consumption, etc., and achieve shortened production cycle, good uniformity, The effect of low energy consumption

Active Publication Date: 2016-01-27
JINGDEZHEN CERAMIC INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the non-hydrolytic sol-gel method also has problems such as long production cycle, high energy consumption in the solvent removal process, and difficulty in industrialization.

Method used

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  • Method for preparing superfine alumina powder with non-water precipitation process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Absolute ethanol is used as the oxygen donor (solvent), iodine is used as the catalyst, and anhydrous acetic acid is used as the precipitating agent. Take 200mL of absolute ethanol and place it in a conical flask, add 0.127g of elemental iodine, stir to dissolve, add 2.7g of metallic aluminum powder, heat in an oil bath at 78.4°C (the boiling point of ethanol) and keep boiling for 12 hours until the elemental element of aluminum reacts completely to form off-white ethanol Aluminum solution, after cooling to room temperature, add 17.2mL of anhydrous acetic acid, raise the temperature to 60°C and keep it warm for 6h until the precipitation is complete, then raise the temperature and keep boiling for 8h, centrifuge to remove the solvent and recover, dry at 80°C for 2h, then keep it at 1100°C for 1h to get Aluminum oxide ultrafine powder.

Embodiment 2

[0021] Anhydrous isopropanol is used as oxygen donor (solvent), mercurous chloride is used as catalyst, and anhydrous acetic acid is used as precipitant. Take 100mL of absolute ethanol and place it in a conical flask, add 0.024g of mercurous chloride, stir to dissolve, add 2.7g of metal aluminum wire, heat in an oil bath at 82.5°C (the boiling point of isopropanol) for 6 hours to keep the aluminum element reacted completely Form a light black aluminum isopropoxide solution, cool to room temperature, add 20.6mL of anhydrous acetic acid, stir at room temperature for 12 hours until the precipitation reaction is complete, then raise the temperature and keep boiling the precipitation slurry for 60 hours, remove the solvent by suction filtration and recover, and dry at 85°C for 2 hours Insulate at 1200°C for 5 hours to obtain superfine alumina powder.

Embodiment 3

[0023] Anhydrous n-propanol is used as oxygen donor (solvent), mercuric chloride is used as catalyst, and anhydrous acetic acid is used as precipitant. Take 200mL of absolute ethanol and place it in a conical flask, add 0.272g of mercuric chloride, stir to dissolve, add 2.7g of metal aluminum foil, heat in an oil bath at 97.4°C (the boiling point of isopropanol) and keep boiling for 8 hours. Black aluminum n-propoxide solution, after cooling to 50°C, add 17.2mL of anhydrous acetic acid, keep it warm for 8h until the precipitation reaction is complete, then raise the temperature and keep boiling the precipitated slurry for 24h, press filter to remove the solvent and recover, dry at 100°C for 2h and then 1250°C Insulated for 8 hours to obtain superfine alumina powder.

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Abstract

The invention discloses a method for preparing superfine alumina powder with a non-water precipitation process. Elemental aluminum is taken as an aluminum source, anhydrous low-carbon alcohol is taken as oxygen donor (solvent), anhydrous low-carbon organic acid is taken as a precipitant, a catalyst is dissolved in the low-carbon alcohol oxygen donor (solvent) firstly, then elemental aluminum is added, the materials are subjected to oil-bath heating until the elemental aluminum reacts sufficiently, the anhydrous low-carbon organic acid precipitant is added, after sufficient precipitation reaction, precipitated slurry is subjected to aging and solvent removal treatment, a wet precipitated material is dried and calcined, and the superfine alumina powder is prepared. The method has the outstanding characteristics of simple process, low control requirement, short preparation period, pollution prevention and the like.

Description

technical field [0001] The invention belongs to the technical field of inorganic material preparation, and in particular relates to a method for preparing superfine alumina powder by adopting a non-aqueous precipitation process. Background technique [0002] Alumina has a series of excellent properties such as high melting point, high hardness, high strength, wear resistance and corrosion resistance. It is an important raw material for fine ceramics and is widely used in chemical, energy, automobile, national defense, microelectronics and aerospace fields. Wide, such as alumina is often used to manufacture rotors, pistons, antenna windows, missile windows, bioceramics, chemical sensors, high-pressure sodium lamps, satellite fairings, etc. The cheap and easy-to-obtain characteristics of alumina also make it the most important engineering ceramic material. With the continuous improvement of material requirements with the development of science and technology, the requirements...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/42
Inventor 冯果江伟辉刘健敏张权吴倩苗立峰陈婷
Owner JINGDEZHEN CERAMIC INSTITUTE