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Process for preparing needle-like bismuth oxide powder

A preparation process and technology of bismuth oxide, applied in inorganic chemistry, bismuth compounds, chemical instruments and methods, etc., can solve the problems of nitrogen oxide gas environmental pollution and high cost, and achieve a wide adjustable range of parameters, low production cost, and repeatability. strong effect

Inactive Publication Date: 2014-07-16
HUNAN XIANGYUN FINE CHEM MFG
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  • Description
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AI Technical Summary

Problems solved by technology

However, this method uses nitric acid to dissolve and produce nitrogen oxide gas, causing serious pollution to the environment, and the cost is also high

Method used

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  • Process for preparing needle-like bismuth oxide powder
  • Process for preparing needle-like bismuth oxide powder

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Embodiment Construction

[0016] The present invention is described further below by embodiment, and its purpose is only to better understand content of the present invention. Therefore, the examples given do not limit the protection scope of the present invention.

[0017] attached figure 1 In order to be shown as a preparation process of acicular bismuth oxide powder, the steps are as follows:

[0018] (1) Add bismuth nitrate crystals into deionized water to make slurry, and stir with a stirrer; control the solid-liquid mass volume ratio = 1:2g / ml; and heat to 70°C under the stirring condition of 280r / min, and keep the temperature constant;

[0019] (2) Prepare a sodium hydroxide solution with a concentration of 7mol / L; in order to control the purity, the prepared sodium hydroxide raw material is selected from caustic soda;

[0020] (3) Add the sodium hydroxide solution prepared in step (2) into the prepared slurry in step (1) dropwise at a constant speed, and control the stirrer to keep stirring a...

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Abstract

The invention discloses a process for preparing needle-like bismuth oxide powder, and belongs to the fields of micro-powder materials and synthesis technology. The process is characterized by taking bismuth nitrate crystal, bismuth subnitrate and bismuth hydroxide as raw materials, taking sodium hydroxide as a precipitator, adopting adding reaction and adjusting synthesis process parameters, so as to obtain the bismuth oxide powder which is good in dispersibility and obvious in needle shape. The bismuth oxide powder is a spindle needle stick in morphology, the particle size is scattered and even, the diameter is about 1-2mu m, the length is 10-20mu m, the draw ratio is greater than 10, and the purity is over 99.95%. The preparation method provided by the invention is free of environmental pollution, simple and convenient in technology and process, wide in adjustable parameter range, strong in repeatability, and low in production cost, and massive industrial production can be carried out.

Description

technical field [0001] The invention relates to a preparation process of bismuth oxide, in particular to a preparation process of acicular bismuth oxide powder, and belongs to the technical field of micropowder materials and synthesis. Background technique [0002] Bismuth oxide micropowder is an important functional material with unique physical and chemical properties and is widely used in various fields. Especially in the electronics industry as an important doped powder material, it can be used as a template seed crystal for functional ceramics, using grain orientation techniques such as hot pressing, hot forging, casting and screen printing to induce grain orientation Growth, preparation of textured functional materials and other fields. Thereby greatly improving the electrical properties of functional materials. [0003] The traditional methods for preparing bismuth oxide include fire method and wet method. The fire method is to first concentrate and crystallize the ...

Claims

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Application Information

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IPC IPC(8): C01G29/00
Inventor 肖辉吴祖祥周贱华
Owner HUNAN XIANGYUN FINE CHEM MFG
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