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Device and method for preparing nanometer tungsten trioxide powder using ultrasonic spray microwave drying method

An ultrasonic spray and microwave drying technology, applied in the direction of tungsten oxide/tungsten hydroxide, etc., can solve the problems of large equipment, large powder loss, low drying efficiency, etc., and achieve the effect of good adaptability, good uniformity, uniform and stable particles

Inactive Publication Date: 2005-08-24
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It solves the problems of low drying efficiency, large powder loss and huge equipment in the spray heat conversion technology, and proposes an equipment that integrates ultrasonic spray and microwave drying to achieve fast and efficient powder production

Method used

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  • Device and method for preparing nanometer tungsten trioxide powder using ultrasonic spray microwave drying method
  • Device and method for preparing nanometer tungsten trioxide powder using ultrasonic spray microwave drying method
  • Device and method for preparing nanometer tungsten trioxide powder using ultrasonic spray microwave drying method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Under the effect of liquid pump 7, ammonium tungstate solution (tungstate radical content is 150g / liter) is transported in the ultrasonic spray device 8 through pipeline from liquid storage tank 6 with the speed of 10ml / s; Under the ultrasonic wave action of 1700KHz, The ammonium tungstate solution is crushed into mist droplets of about 1 μm; the mist droplets are heated and pre-dried by the conveying pipeline 9 and then transported to the microwave dryer 10. Using 2450MHz continuous microwave, the mist droplets are dried at a rate of 0.8Kg / KW h Speed ​​dehydration, ammonium tungstate undergoes a chemical reaction, decomposes ammonia gas, and at the same time obtains solid particle nano WO 3 , under gravity, the nano-WO 3 The powder gathers at the bottom of the reaction tower, and the nano WO 3 The powder is collected into bucket 12.

Embodiment 2

[0026] Under the action of the liquid pump 7, the ammonium tungstate solution with a tungstate concentration of 550g / liter is transported from the liquid storage tank 6 to the ultrasonic spray device 8 through a pipeline at a speed of 25ml / s; under the action of ultrasonic waves with a frequency of 3600KHz, The ammonium tungstate solution is crushed into mist droplets of about 0.3 μm; the mist droplets are transported to a microwave dryer, and the mist droplets are dehydrated at a drying speed of 1Kg / KW h by using a 915MHz continuous microwave, and the ammonium tungstate is heated to produce chemical Reaction, ammonia gas is decomposed, and solid particle nano WO is obtained at the same time 3 , the powder is deposited at the bottom of the reaction chamber, and the nano-WO 3 The powder is collected into bucket 12.

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Abstract

An apparatus for preparing WO3 nanoparticles is composed of liquid material delivering unit, ultrasonic atomizer, microwave generator, and power collector. Its preparing process includes such steps as ultrasonic atmozing of ammonium tungstate solution, delivering while predrying, microwave drying, and thermodecomposing of ammonium tungstate to obtain WO3 nanoparticles.

Description

technical field [0001] The invention belongs to WO 3 The technical field of powder preparation, especially provides a kind of ultrasonic spray microwave drying preparation nano tungsten trioxide (WO 3 ) powder device and method. Background technique [0002] Nano WO 3 Powder is an important industrial raw material, which can be used to prepare nano-tungsten powder and nano-tungsten carbide (WC) powder; in addition, nano-WO 3 It has a strong absorption capacity for electromagnetic waves, can be used as an excellent absorbing material in the use of solar energy, and can be used as an important invisible material in the military; nano-scale WO 3 The powder has a huge specific surface and significant surface effect, and is a good catalyst; as a transition metal compound, nano-WO 3 It also has semiconducting properties and is a very potential sensitive material for NO x 、H 2 S, NH 3 And many other gases are sensitive. [0003] Currently common preparation WO 3 The method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/02
Inventor 郭志猛卢广锋金雪华李燏
Owner UNIV OF SCI & TECH BEIJING
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