Preparation for nanometer anhydrous wolframic acid powder

A tungsten trioxide powder and nanotechnology, applied in the direction of tungsten oxide/tungsten hydroxide, etc., can solve the problems of high cost of surfactants, unsuitability for large-scale powder production, complex reaction process, etc., and achieve simple and easy control of the reaction process, The effect of low cost and avoiding environmental pollution

Inactive Publication Date: 2005-05-11
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0018] The cost of surfactant in this method is relatively high, and the react

Method used

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  • Preparation for nanometer anhydrous wolframic acid powder
  • Preparation for nanometer anhydrous wolframic acid powder
  • Preparation for nanometer anhydrous wolframic acid powder

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Raw materials: ammonium tungstate solution (15%), nitric acid, ammonium carbonate ((NH 4 ) 2 CO 3 ), formic acid (HCOOH)

[0040] Measure 100ml of ammonium tungstate solution into a beaker, add 12g of ammonium carbonate and 3g of formic acid, and stir well; heat the solution to 60°C, add 20ml of nitric acid, and form yellow tungstate gel during stirring; take the gel and place it in a dry place for stirring In a container, stir at a temperature of 150°C for 30 to 50 minutes to obtain light yellow nano WO 3 pink.

Embodiment 2

[0042] Raw materials: ammonium tungstate solution (60%), aqua regia (hydrochloric acid: nitric acid = 1:1), ammonium carbonate ((NH 4 ) 2 CO 3 ), industrial acetic acid (HAc)

[0043]Measure 1000ml of ammonium tungstate solution into a beaker, weigh 120g of ammonium carbonate and 200g of acetic acid, and stir evenly; heat the solution to 75°C, add 270ml of aqua regia, and form a yellow tungstic acid gel during the stirring process; take the gel and place it in In a dry mixer, stir at a temperature of 450°C for 60-80 minutes to obtain light yellow powder WO 3 .

Embodiment 3

[0045] Raw materials: ammonium tungstate solution (38.6%), hydrochloric acid, ammonium bicarbonate (NH 4 HCO 3 ), industrial acetic acid (HAc), measure 100ml of ammonium tungstate solution and pour it into a beaker, add 7g of ammonium bicarbonate and 17g of acetic acid, and stir evenly with a glass rod; then heat the solution and keep stirring; when the solution is heated to 70°C, stop Heat, slowly inject 30ml of concentrated hydrochloric acid, stir the solution while adding, the reaction proceeds rapidly; the solution slowly loses fluidity, and finally forms a yellow gel as the temperature decreases; take out the gel and place it in a crucible, and heat it on an electric furnace , and keep the temperature at about 200°C; stir the gel, the water evaporates, and the intermediate product decomposes. After about 40-60 minutes, the final product WO 3 .

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Abstract

Production for anhydrous wolframic acid powder is carried out by: adding ammonium salt equal to ammonium wolframate mass 5%-90% with (NH4)2WO4 solution as raw material, adding organic acid equal to ammonium wolframate mass 10%-85%, agitating, pouring into strong acid at temperature 40deg.C- 90deg.C, agitating to obtain yellow ortho-tungstic acid gel, putting the ortho-tungstic acid gel into agitating drier, and incinerating at temperature 100deg.C-500deg.C for 1- 4hrs to obtain the end product nanometer WO3. Its advantages include low cost, simple process and no pollution.

Description

technical field [0001] The invention belongs to the technical field of tungsten trioxide powder preparation, and in particular provides a nano-tungsten trioxide (WO 3 ) powder preparation method, the industrialized production of nano tungsten trioxide has been realized. 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 It 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 co...

Claims

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Application Information

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IPC IPC(8): C01G41/02
Inventor 郭志猛卢广锋曲选辉李燏
Owner UNIV OF SCI & TECH BEIJING
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