Method for industrially continuously preparing nano tungsten powder

A technology of nano-tungsten powder and tungsten trioxide, which is applied in the direction of nanotechnology, can solve the problems of reduced reaction rate and W particle growth, and achieves the effects of low agglomeration, uniform particle size distribution, and reduced production costs

Active Publication Date: 2018-01-12
CHONGYI ZHANGYUAN TUNGSTEN
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Gas-phase reduction of tungsten oxide (WO) by hydrogen 3 ) is a common method to prepare nano-tungsten powder, however, the reduction of tungsten oxide with hydrogen will generate WO 2 (OH) 2 (g) Mesophase, which reduces the reaction rate and leads to the growth of W particles

Method used

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  • Method for industrially continuously preparing nano tungsten powder
  • Method for industrially continuously preparing nano tungsten powder
  • Method for industrially continuously preparing nano tungsten powder

Examples

Experimental program
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Effect test

Embodiment 1

[0062] Separately place 50g tungsten trioxide and 16.82g (the molar ratio of zinc to tungsten trioxide is 1.2:1) zinc powder in the first-stage reaction zone in the high-temperature tube furnace, and place 50g tungsten trioxide ( In order to ensure that the elemental zinc is completely recovered), the N 2 The air in the high-temperature tube furnace is exhausted, and the low-temperature zinc reduction reaction is carried out at 450 ° C. The reduction time is 60 minutes to obtain a mixture of zinc oxide and nano-tungsten powder; hydrogen is introduced into the high-temperature tube furnace, and a period of Raise the temperature of the reaction zone to 900°C, raise the temperature of the second-stage reaction zone to 400°C, and keep it warm for 120 minutes. In the first-stage reaction zone, nano-tungsten powder is obtained, and in the second-stage reaction zone, a mixture containing nano-tungsten powder and zinc oxide is obtained. XRD, SEM and BET detection and analysis were car...

Embodiment 2

[0067]Separately place 50g tungsten trioxide and 21.03g (the molar ratio of zinc to tungsten trioxide is 1.5:1) zinc powder in the first-stage reaction zone in the high-temperature tube furnace, and place 50g tungsten trioxide ( In order to ensure that the elemental zinc is completely recovered), the N 2 The air in the high-temperature tube furnace is exhausted, and the low-temperature zinc reduction reaction is carried out at 500 ° C. The reduction time is 60 minutes to obtain a mixture of zinc oxide and nano-tungsten powder; hydrogen gas is introduced into the high-temperature tube furnace, and a period of The temperature of the reaction zone is raised to 900°C, the temperature of the second-stage reaction zone is raised to 450°C, and the temperature is kept for 60 minutes. The nano-tungsten powder is obtained in the first-stage reaction area, and the mixture containing nano-tungsten powder and zinc oxide is obtained in the second-stage reaction area. The mixture of zinc oxi...

Embodiment 3

[0072] Separately place 50g tungsten trioxide and 16.82g (the molar ratio of zinc to tungsten trioxide is 1.2:1) zinc powder in the first-stage reaction zone in the high-temperature tube furnace, and place 50g tungsten trioxide ( In order to ensure that the zinc element is completely recovered), Ar gas is introduced to discharge the air in the high-temperature tube furnace, and a low-temperature zinc reduction reaction is carried out at 600 ° C. The reduction time is 120 minutes to obtain a mixture of zinc oxide and nano-tungsten powder; Introduce hydrogen into the high-temperature tube furnace, raise the temperature of the first-stage reaction zone to 950°C, raise the temperature of the second-stage reaction zone to 500°C, and keep it warm for 120 minutes. Nano-tungsten powder is obtained in the first-stage reaction zone, and nano- A mixture of tungsten powder and zinc oxide. The mixture of zinc oxide and nano-tungsten powder obtained by reducing tungsten trioxide with zinc i...

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Abstract

The invention discloses a method for industrially continuously preparing nano tungsten powder. The method comprises the steps that (1) zinc elementary substances and first tungsten trioxide are placedin a first reaction zone in a high temperature tube furnace at intervals, second tungsten trioxide is placed in a second reaction zone, the zinc elementary substances are volatilized and are in contact reaction with first tungsten trioxide, and a mixture of first zinc oxide and nano tungsten powder is obtained; (2) hydrogen is introduced into the high temperature tube furnace, first zinc oxide isconveniently reduced through hydrogen, zinc steam is volatilized, and a nano tungsten powder product is obtained; (3) volatilized zinc steam is in contact reaction with second tungsten trioxide, anda mixture of second zinc oxide and nano tungsten powder is obtained; (4) the nano tungsten powder product in the first reaction zone is taken out, the mixture of second zinc oxide and nano tungsten powder is moved into the first reaction zone, and third tungsten trioxide is placed in the second reaction zone; and (5) the steps (2), (3) and (4) are repeated and circularly operated. According to themethod, industrial continuous production of nano tungsten powder can be achieved.

Description

technical field [0001] The invention belongs to the field of metal smelting, in particular, the invention relates to a method for industrially and continuously preparing nano-tungsten powder. Background technique [0002] The traditional method of preparing tungsten powder from tungstate (commonly used ammonium paratungstate) is divided into two steps. First, tungstate is converted into tungsten oxide by calcination, and then tungsten oxide is reduced to tungsten powder under hydrogen atmosphere. The initial preparation method of ultra-fine tungsten powder is to improve the original method of preparing tungsten powder by reducing tungsten oxide with hydrogen, mainly by reducing the thickness of the reduction material layer, reducing the reduction temperature and increasing the flow rate of hydrogen reduction, etc., in the traditional push boat method Fine tungsten powder is produced in a furnace or a converter. Gas-phase reduction of tungsten oxide (WO) by hydrogen 3 ) is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22B82Y40/00
Inventor 黄泽辉邓登飞
Owner CHONGYI ZHANGYUAN TUNGSTEN
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