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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, which is applied in the field of preparing blue tungsten oxide by self-reduction of ammonium paratungstate, can solve problems such as affecting health, air pollution, and increasing consumption.

Inactive Publication Date: 2005-03-16
XIAMEN GOLDEN EGRET SPECIAL ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Owing to adopting above-mentioned method to prepare blue tungsten oxide, ammonia gas or nitrogen, hydrogen mixed gas or hydrogen gas need to be passed into the discharge port, need to increase consumption of the ammonia gas etc. that pass into, cause processing cost to increase; And by ammonium paratungstate Most of the decomposed ammonia gas is drawn out by the fan at the feed inlet and discharged into the atmosphere, polluting the atmosphere and affecting people's health

Method used

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  • 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 in a well-sealed container, that is, a furnace tube, feed ammonium paratungstate 5 (NH 4 ) 2 O·12WO 3 ·5H 2 O, heat the furnace tube, and 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 t...

Embodiment 2

[0045] Embodiment two, see figure 1 Shown, a kind of method of ammonium paratungstate of the present invention prepares 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 method of ammonium paratungstate of the present invention prepares 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 adopt ammonia gas at the discharge port or a mixture of nitrogen and hy...

Claims

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Application Information

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Patent Type & Authority Applications(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
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