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Method and apparatus for preparing blue tungsten oxide by ammonium paratungstate self-reduction

A technology of blue tungsten oxide and ammonium paratungstate, applied in the direction of tungsten oxide/tungsten hydroxide, etc., can solve problems such as air pollution, increased processing costs, and impact on health

Inactive Publication Date: 2006-01-25
XIAMEN GOLDEN EGRET SPECIAL ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the preparation of blue tungsten oxide by the above method needs to feed ammonia or nitrogen, hydrogen mixed gas or hydrogen at the discharge port, it is necessary to increase the consumption of the fed ammonia, etc., resulting in an increase in processing costs; and decomposed by ammonium paratungstate Most of the ammonia gas is drawn out by the fan at the feed inlet and discharged into the atmosphere, which pollutes the atmosphere and affects the health of the people.

Method used

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  • Method and apparatus for preparing blue tungsten oxide by ammonium paratungstate self-reduction
  • Method and apparatus for preparing blue tungsten oxide by ammonium paratungstate self-reduction

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Embodiment 1

[0029] Embodiment one, see figure 1 Shown, a kind of ammonium paratungstate of the present invention prepares the method for blue tungsten oxide, is to use ammonium paratungstate 5(NH 4 ) 2 O·12WO 3 ·5H 2 O is the raw material, and ammonium paratungstate 5 (NH 4 ) 2 O·12WO 3 ·5H 2 O, heat the furnace tube, ammonium paratungstate 5 (NH 4 ) 2 O·12WO 3 ·5H 2 O is heated and decomposed into tungsten trioxide WO 3 , Ammonia NH 3 and water vapor H 2 O, its chemical reaction formula is as follows:

[0030]

[0031] In the furnace tube, make full use of tungsten oxide WO X is ammonia NH 3 Decomposition of good catalytic properties, the above thermal decomposition of ammonia NH 3 further decomposed into nitrogen gas N 2 and hydrogen H 2 , and its chemical reaction formula is as follows:

[0032]

[0033] Then by controlling a certain reaction temperature and proper furnace gas pressure, in the furnace tube, hydrogen H 2 Tungsten trioxide WO 3 Reduced ...

Embodiment 2

[0045] Embodiment two, see figure 1 Shown, a kind of ammonium paratungstate of the present invention prepares the method for blue tungsten oxide, and the difference of embodiment one is that ammonium paratungstate 5(NH 4 ) 2 O·12WO 3 ·5H 2 When O is heated, its heating temperature is set at 600°C; while the reaction temperature in the furnace tube is set at 750°C; the furnace gas pressure is adjusted to 1.5 mbar.

Embodiment 3

[0046] Embodiment three, see figure 1 Shown, a kind of ammonium paratungstate of the present invention prepares the method for blue tungsten oxide, and the difference of embodiment one is that ammonium paratungstate 5(NH 4 ) 2 O·12WO 3 ·5H 2 When O is heated, its heating temperature is set at 500°C; while the reaction temperature in the furnace tube is set at 650°C; the pressure of the furnace gas is adjusted to 0.5 mbar.

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Abstract

The invention discloses a method and apparatus for preparing blue tungsten oxide by ammonium paratungstate self-reduction, wherein the discharging end of the preparing apparatus is provided with sealed discharger, a cooling device, an air exhaust fan and an air vent, the preparation comprises loading the ammonia paratungstate into the furnace tube of the preparing apparatus, heating the furnace tube, so as to decompose the ammonia paratungstate into WO3, ammonia gas NH3 and water vapor H2O, further decomposing the NH3 into nitrogen N2 and hydrogen H2, controlling the reaction temperature and combustion gas pressure so as to deacidize the tungsten trioxide WO3 into blue tungsten oxide.

Description

technical field [0001] The invention belongs to metal smelting technology, in particular to a method and a device for preparing blue tungsten oxide by self-reduction of ammonium paratungstate. Background technique [0002] Blue tungsten oxide can be used to make tungsten powder. Tungsten is one of the most refractory metals, with a melting point as high as 3410°C. It has high hardness, strong ductility, and is not eroded by air at room temperature. Powder has a wide range of applications, such as the preparation of high specific gravity alloys, used in automatic watch pendulums, telecommunication vibrators, aircraft balance boards, anti-x-rays, alpha-rays, gamma-ray protection boards, etc.; can also be used to prepare electrical alloys , such as high voltage contacts, etc. At present, the method of producing blue tungsten oxide at home and abroad is to use ammonium paratungstate as the raw material, and use ammonia gas at the discharge port, or nitrogen and hydrogen mixed g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G41/02
Inventor 吴冲浒吴其山陈金铃林高安张庆国
Owner XIAMEN GOLDEN EGRET SPECIAL ALLOY