Method for producing high purity nano-level bismuth oxide micro-powder

A production method and technology of bismuth oxide, applied in chemical instruments and methods, nanotechnology, nanotechnology and other directions, can solve the problems of easy wear and tear of liquid metal bismuth, increase production cost, affect production efficiency, etc., and meet the requirements of equipment is not high, Easy-to-control, easy-to-operate effects

Inactive Publication Date: 2008-05-28
HUNAN XIANGYUN FINE CHEM MFG
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Problems solved by technology

Although the process of this invention is short, the long-term contact of the atomizing nozzle of the diversion tube with the overheated liquid metal bismuth is very easy to wear, which seriously affects the production efficiency. In addition, high-pressure oxygen is required for gas atomization, and a slight misoperation will cause an explosion. Safety, but also increased production costs

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  • Method for producing high purity nano-level bismuth oxide micro-powder

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Embodiment Construction

[0022] Now describe the present invention with specific embodiment in conjunction with accompanying drawing.

[0023] A production method of high-purity nano-scale bismuth oxide micropowder, the process steps are as follows:

[0024] a. Add bismuth ingots with a content of 99.99% into an electric arc furnace made of 316L stainless steel, heat and melt the bismuth ingots, and produce bismuth vapor through evaporation under the conditions of a temperature of 1000-1500°C and a pressure of 0.6-0.95 atmospheres;

[0025] b. After the bismuth vapor is sent into the reactor, it merges with the air sent into the reactor, and the high-temperature bismuth vapor is oxidized to form nano-scale solid bismuth oxide particles. At the same time, after the reactor inhales cold air, the flue gas temperature drops to about 170°C , after cooling by water circulation, part of the coarse bismuth oxide powder accumulates at the bottom of the reactor and is discharged back to the electric arc furnace...

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Abstract

The invention relates to a manufacturing method of bismuth oxide fine powder with high purity nanometer grade, which pertains to the technical field of nanometer material preparation technology. The invention uses an electric arc furnace for heating, in which metal bismuth is melted and evaporated. The reaction between the bismuth vapor and the oxygen in air produces the bismuth oxide fine powder with high purity nanometer grade. Since the reaction happens in gas phase, the granularity of the bismuth oxide fine powder with high purity nanometer grade is very fine; the average granularity is no more than 1 micron. Then the bismuth oxide fine powder with high purity nanometer grade is gained by two-level dust collecting. The invention has simple technique and low requirements on a device, dispersant is not required to be added and no toxic and hazardous emissions are produced to influence the environment in the production process.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation technology, in particular to a production method of high-purity nano-scale bismuth oxide micropowder. Background technique [0002] Nano bismuth oxide (Bi 2 o 3 ) powder has a high surface area, and the ratio of the number of surface atoms to the number of volume atoms increases sharply with the decrease of the particle size, thus showing a significant size effect, volume effect, surface effect, and even quantum size effect and the macroscopic tunnel effect. These characteristics make the high-purity nano-scale bismuth oxide powder have some excellent properties as an electronic functional powder doping material, and are widely used in the production of display components, sensitive components, and dielectric ceramic electronic components. It can also be used as a catalyst for organic synthesis, a flame retardant for special glass and chemical fiber products, etc. So nano bism...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G29/00B82B3/00
Inventor 何勇吴祖祥雷日华谢大鹏戴艳平王志雄
Owner HUNAN XIANGYUN FINE CHEM MFG
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