Method for preparing nano aluminum oxide powder

A nano-alumina and powder technology, applied in alumina/hydroxide preparation, nanotechnology, nanotechnology and other directions, can solve the problems of easy agglomeration of powder, low drying efficiency, slow feeding speed, etc. The effect of explosive nucleation, fast feeding and low cost

Inactive Publication Date: 2008-05-28
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the deficiencies of the above-mentioned technologies, and solve the problems of slow feeding speed, uneven mixing, low drying efficiency, and easy agglomeration of powders in the previous process feeding methods.

Method used

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  • Method for preparing nano aluminum oxide powder
  • Method for preparing nano aluminum oxide powder

Examples

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Embodiment 1

[0028] Al(NO 3 ) 3 The concentration is 0.2mol / L; (NH 4 )HCO 3 The initial concentration of the solution is 2.5mol / L, and the pH value is adjusted to 9.5 with ammonia water; the spray feed rate is 0.4ml / min on the average per square centimeter of the liquid surface area of ​​the ammonium bicarbonate solution by using a sprayer that can control the flow rate. ; (NH 4 )HCO 3 The solution was stirred by strong magnetic force, the stirring speed was 1200r / min, and the reaction time was 2.5h. Add 1% polyethylene glycol in the ammonium bicarbonate solution, (NH 4 )HCO 3 with Al(NO 3 ) 3 The molar ratio is 6, and the temperature is 25°C. The obtained precipitate was aged for 3 hours, washed 4 times with water, then washed 3 times with absolute ethanol, and then dried in a microwave oven. The microwave oven used a power of 300W in the initial drying stage, and a power of 150W in the latter stage. The time used in the front and rear stages were respectively 10min and 30min, an...

Embodiment 2

[0030] Al(NO 3 ) 3 Concentration is 0.3mol / L; (NH 4 )HCO 3 The initial concentration of the solution is 2.5mol / L, and the pH value is adjusted to 9.6 with ammonia water; a sprayer that can control the flow rate is used, and the spray feed rate is 0.3ml / min on the average per square centimeter of the liquid surface area of ​​the ammonium bicarbonate solution. ; (NH 4 )HCO 3 The solution was stirred by strong magnetic force, the stirring speed was 1200r / min, the reaction time was 3h, and 1.5% polyethylene glycol was added in the ammonium bicarbonate solution, (NH 4 )HCO 3 with Al(NO 3 ) 3 The molar ratio is 7, and the temperature is 25°C. The obtained precipitate was aged for 3 hours, washed 4 times with water, then washed 3 times with absolute ethanol, and then dried in a microwave oven. The microwave oven used a power of 300W in the initial drying stage, and a power of 150W in the latter stage. The time used in the front and rear stages were respectively 10min and 30m...

Embodiment 3

[0032] al 2 (SO 4 ) 3 The concentration is 0.2mol / L; (NH 4 )HCO 3 The initial concentration of the solution is 2.5mol / L, and the pH value is adjusted to 9.6 with ammonia water; a sprayer that can control the flow rate is used, and the spray feed rate is 0.3ml / min on the average per square centimeter of the liquid surface area of ​​the ammonium bicarbonate solution. ; (NH 4 )HCO 3 The solution was stirred by strong magnetic force, the stirring speed was 1200r / min, the reaction time was 3h, and 1.5% polyethylene glycol was added in the ammonium bicarbonate solution, (NH 4 )HCO 3 with Al(NO 3 ) 3 The molar ratio is 7, and the temperature is 25°C. The obtained precipitate was aged for 3 hours, washed 4 times with water, then washed 3 times with absolute ethanol, and then dried in a microwave oven. The microwave oven used a power of 300W in the initial drying stage, and a power of 150W in the latter stage. The time used in the front and rear stages were respectively 10min...

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Abstract

The invention relates to a preparation method of nano-alumina powder, and is characterized in that a preparation process embodies that aluminum salt solution atomized by spraying is first sprayed into ammonium bicarbonate solution in a stirred state, then reacting with surfactant added; the mixture obtained is next treated with microwave drying after precipitation, aging, filtration and washing, calcined to obtain the nano-alumina powder. In addition, the dried AACH prepared by the preparation method of the invention can be calcined to obtain nano Gamma-Al2O3 with less conglobation and uniform particle size.

Description

technical field [0001] The invention relates to a method for preparing nano-alumina powder. Background technique [0002] Nano-Al as one of special functional materials 2 o 3 Powder, due to its excellent characteristics of high strength, high hardness, wear resistance, corrosion resistance, high temperature resistance, oxidation resistance, good insulation, large surface area, etc., has been used in chemical catalysts, rare earth three primary color phosphors, integrated circuit chips, single Crystal materials, physical and chemical instruments, artificial bones, laser materials, aviation light source devices and many other high-tech cutting-edge industries have been widely used. Nevertheless, nano-Al 2 o 3 Powder preparation technology still appears to be progressing slowly compared to its application. Especially in its preparation technology, there are many technical and engineering problems. Some of the achievements that have been made are still in the small-scale t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/30B82B3/00
Inventor 颜恒维张树朝刘战伟
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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