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Preparation method of tungsten oxide (WO3) nanometer powder

A nano-powder, tungsten oxide technology, applied in the direction of tungsten oxide/tungsten hydroxide, nanotechnology, nanotechnology, etc., can solve the problems that the industrial scale is difficult to meet the requirements, the tungsten oxide is difficult to meet the particle size requirements, and the preparation cost rises.

Active Publication Date: 2015-07-15
康硕(山西)智能制造有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

[0006] However, the tungsten oxide (WO) produced by the above-mentioned pyrolysis method 3 ) particle size is relatively coarse, usually the particle size of the product obtained from APT raw material is 10-20μm, while the particle size of the product obtained from tungstic acid raw material is 3-10μm
In order to obtain higher chemical activity in the subsequent processing and better promotion of alloys with special requirements, tungsten oxide (WO) is often required 3 ) has a finer particle size and a larger specific surface area, which makes the tungsten oxide (WO) prepared by the traditional pyrolysis method 3 ) is becoming more and more difficult to meet the granularity requirements
People began to turn the research to other tungsten oxide (WO 3 ) preparation method, such as the gas phase method, although the gas phase method can obtain finer tungsten oxide (WO) such as tens of nm 3 ) powder, but its preparation cost is greatly increased compared with the pyrolysis method, and the industrial scale is difficult to meet the requirements

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  • Preparation method of tungsten oxide (WO3) nanometer powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] First, ammonium paratungstate (APT) with a particle size of about 5 μm and a purity greater than 99.9wt% was selected as the reaction raw material, distilled water was added to the reaction vessel, and stirred with an electromagnetic stirrer at a stirring speed of 180-200r / min, and lemon was added while stirring. acid solution;

[0023] Second, after waiting for the citric acid solution to completely dissolve and mix evenly, add high-purity ammonium paratungstate (APT) to the reaction vessel while stirring, and finally calculate the molar ratio of ammonium paratungstate (APT) to citric acid to be 3;

[0024] Third, after the high-purity ammonium paratungstate (APT) has been added, add ammonia water with a concentration of 30%, and stir evenly to obtain a reaction solution;

[0025] Fourth, the reaction solution is concentrated in an evaporation container, and the concentrated solution is dried in a drying device at 150-160° C. to obtain a precursor;

[0026] Fifth, the...

Embodiment 2

[0028] First, ammonium paratungstate (APT) with a particle size of about 5 μm and a purity greater than 99.9wt% was selected as the reaction raw material, distilled water was added to the reaction vessel, and stirred with an electromagnetic stirrer at a stirring speed of 180-200r / min, and lemon was added while stirring. acid solution;

[0029] Second, after the citric acid solution is completely dissolved and mixed evenly, add high-purity ammonium paratungstate (APT) to the reaction vessel while stirring, and finally the molar ratio of ammonium paratungstate (APT) to citric acid is calculated as 1.5;

[0030] Third, after the high-purity ammonium paratungstate (APT) has been added, add ammonia water with a concentration of 30%, and stir evenly to obtain a reaction solution;

[0031] Fourth, the reaction solution is concentrated in an evaporation container, and the concentrated solution is dried in a drying device at 150-160° C. to obtain a precursor;

[0032] Fifth, the precu...

Embodiment 3

[0034] First, ammonium paratungstate (APT) with a particle size of about 5 μm and a purity greater than 99.9wt% was selected as the reaction raw material, distilled water was added to the reaction vessel, and stirred with an electromagnetic stirrer at a stirring speed of 180-200r / min, and lemon was added while stirring. acid solution;

[0035] Second, after waiting for the citric acid solution to completely dissolve and mix evenly, add high-purity ammonium paratungstate (APT) to the reaction vessel while stirring, and finally calculate the molar ratio of ammonium paratungstate (APT) to citric acid to be 1;

[0036] Third, after the high-purity ammonium paratungstate (APT) has been added, add ammonia water with a concentration of 30%, and stir evenly to obtain a reaction solution;

[0037] Fourth, the reaction solution is concentrated in an evaporation container, and the concentrated solution is dried in a drying device at 150-160° C. to obtain a precursor;

[0038] Fifth, the...

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Abstract

The invention relates to a pyrolytic preparation method of nanometer-level tungsten oxide (WO3) powder. The tungsten oxide (WO3) nanometer powder with grain diameters uniformly distributed is obtained by adopting preferred raw material composition including APT (Ammonium Paratungstate), citric acid and ammonia water according to a corresponding proportion that the mole ratio of the APT to the citric acid is calculated to 1.5 as well as in combination with matched preparation process parameters that the flow rate of oxygen is 55 ml / minute and the heat treatment temperature is 520 DEG C in terms of each gram of precursors.

Description

technical field [0001] The present invention relates to a kind of tungsten oxide (WO 3 ) preparation method, especially a kind of tungsten oxide (WO 3 ) The pyrolysis preparation method of nanometer powder. Background technique [0002] Tungsten oxide (WO 3 ) is a yellow-green powder, which is an important oxide of tungsten. It is mainly used to manufacture W powder and WC powder, that is, tungsten rod, tungsten wire and cemented carbide 3 ) main terminal object. [0003] Today's tungsten oxide (WO 3 ) preparation method is mainly calcination pyrolysis method, wherein the raw material of pyrolysis mainly involves ammonium paratungstate (APT) and tungstic acid (H 2 WO 4 ), and the corresponding thermal decomposition formulas are: [0004] 5(NH 4 ) 2 O·12WO 3 ·5H 2 O=12WO 3 +10NH 3 +10H 2 O(1), [0005] h 2 WO 4 = WO 3 +H2O (2), [0006] However, the tungsten oxide (WO) produced by the above-mentioned pyrolysis method 3 ) particle size is relatively coarse,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G41/02B82Y30/00
Inventor 刘亚静
Owner 康硕(山西)智能制造有限公司