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Method for synthesizing submicron spherical bismuth oxide through self-propagating reaction

A submicron-scale, self-propagating technology, applied in chemical instruments and methods, inorganic chemistry, bismuth compounds, etc., can solve problems such as high equipment requirements, short process flow, and expensive raw materials, and achieve rapid reaction process and operator requirements. The effect of low and uniform product morphology

Active Publication Date: 2017-11-21
SUZHOU INSTITUE OF WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the preparation of bismuth oxide by direct precipitation method is low in cost and simple in operation, it is easy to cause local inhomogeneity and agglomeration
The microemulsion method uses toluene as the oil phase, and by selecting a suitable surfactant, nano-Bi with an average particle size of 4-5 nm can be prepared 2 o 3 Powder, its advantages are convenient operation, simple device, uniform particle size, the disadvantage is high cost, not suitable for mass production
Take Bi(OR) 3 (R:CH 2 CH 2 OCH 3 ,Cme 2 Et) as a precursor to synthesize spherical Bi 2 o 3 Polycrystalline powder with a particle size range of 60-120nm, although it has the advantages of low cost, simple equipment, and easy control, but the main problem of this method is the high cost of raw materials
Bi(NO 3 ) 3 Dissolved in an appropriate solvent (such as ethanol / nitric acid or acetic acid), under an oxygen atmosphere, the nano-Bi can also be obtained by flame spray pyrolysis 2 o 3 Powder, this technology has the characteristics of short process flow, high product purity, fine particle size, no pollution, low cost, etc., but has high requirements for equipment and process parameters
In summary, the existing methods for preparing nano-bismuth oxide are difficult to be industrialized due to factors such as expensive raw material costs, high equipment requirements, many process flows, uneven products or agglomeration.

Method used

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  • Method for synthesizing submicron spherical bismuth oxide through self-propagating reaction
  • Method for synthesizing submicron spherical bismuth oxide through self-propagating reaction
  • Method for synthesizing submicron spherical bismuth oxide through self-propagating reaction

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Experimental program
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Embodiment 1

[0030] First, according to 14.6% Al, 62.9% Bi 2 o 3 , 9.6%Al 2 o 3 , 5.1% NaCl, 3.8% CaO, 4% SiO 2 The mass ratio of Al and Bi with a particle size of 200 mesh 2 o 3 、Al 2 o 3 , NaCl, SiO 2 , CaO powder, and then use a stirring device to fully mix them evenly, then put the mixed powder into a vacuum drying oven, and dry at 25°C for 3 hours; then put the dried reactant powder into the reaction chamber of the reaction device Spread a layer of igniting powder evenly on the surface, and insert the electric ignition head of the electronic igniter; cover the collection device directly above the reaction device, press the switch of the electronic igniter to ignite the reactant powder, wait After the reaction, wait for the product to cool naturally, and collect the generated nano-bismuth oxide material on the inner wall of the collection device. The X-ray diffraction and scanning electron microscope characterization results of the product prove that the obtained product is sp...

Embodiment 2

[0032] First, according to 14.8% Al, 68.1% Bi 2 o 3 , 7.5%Al 2 o 3 , 4.3% NaCl, 3% CaO, 2.3% SiO 2 The mass ratio of Al and Bi with a particle size of 200 mesh 2 o 3 、Al 2 o 3 , NaCl, SiO 2, CaO powder, and then use a stirring device to fully mix them evenly, then put the mixed powder into a vacuum drying oven, and dry at 25°C for 3 hours; then put the dried reactant powder into the reaction chamber of the reaction device Spread a layer of igniting powder evenly on its surface, and insert the electric ignition head of the electronic igniter; cover the collection device directly above the reaction device, press the switch of the electronic igniter to ignite the reactant powder, wait After the reaction, wait for the product to cool naturally, and collect the generated nano-bismuth oxide material on the inner wall of the collection device. The X-ray diffraction and scanning electron microscope characterization results of the product prove that the obtained product is sph...

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Abstract

The invention discloses a method for synthesizing a submicron spherical bismuth oxide particle through self-propagating high-temperature technology, belonging to the technical field of preparation technology for ultrafine powder material. The method comprises the following steps: proportionally weighing Al, Bi2O3, Al2O3, NaCl, SiO2 and CaO powder with particle sizes of 200 meshes, carrying out thorough and uniform mixing, then adding mixed powder into a vacuum oven, and carrying out drying at 25 DEG C for 3 hours; then filling the reaction chamber of a reaction device with the dried powder, uniformly spreading a layer of pyrophoric powder on the surface of the dried powder, and inserting the electric ignition head of an electronic ignition device; and finally, allowing a collection device to cover over the reaction device, igniting the reactant powder, and after the reaction is over, collecting a generated superfine bismuth oxide powder material on the inner wall of the collection device. The method has the advantages of simple device, easy operation, low preparation cost, rapid reaction process, large output and high production efficiency.

Description

technical field [0001] The invention belongs to the technical field of ultrafine powder material preparation, and in particular relates to a method for synthesizing submicron spherical bismuth oxide particles by self-propagating reaction. Background technique [0002] Bismuth oxide is an important functional material, which is widely used in various fields such as catalysis, electronic ceramics, solid electrolytes, optoelectronic materials, sensors, microelectronic components and high-temperature superconducting materials. It is not only a good organic synthesis catalyst, ceramic colorant, plastic flame retardant, pharmaceutical astringent, glass additive, high refractive glass and nuclear engineering glass manufacturing and nuclear reactor fuel, but also an important doping powder in the electronics industry Material. In addition to the properties and uses of bismuth oxide with a general particle size, the micro-nano-scale bismuth oxide has a significant quantum size effec...

Claims

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Application Information

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IPC IPC(8): C01G29/00
CPCC01G29/00C01P2002/72C01P2004/03C01P2004/32C01P2004/62C01P2006/80
Inventor 张国栋张楚李明德温佳珉张建强薛龙建
Owner SUZHOU INSTITUE OF WUHAN UNIV