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[Chemical Knowledge]：Manufacturing method and process of silicon micropowder

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The manufacturing method
of silicon powder
1. overview

silicon powder is an important raw material for chemical production, widely used in electronics, ceramics, coatings, plastics and other fields. With the continuous progress of science and technology, the manufacturing method of silicon powder has been continuously developed and improved. This article will introduce several common silicon micropowder manufacturing methods.

2. physical method

physical method is to crush natural quartz sand or fused quartz into micron or submicron powder by mechanical crushing, ball milling, jet milling, etc. The advantages of this method are simple process and low cost, but the product has low purity and wide particle size distribution.

1. mechanical grinding method

mechanical grinding method is the natural quartz sand or fused quartz through crushing, grinding, classification and other processes, made of silicon powder. The key equipment of this method is the mill and classifier, the commonly used mill has a ball mill, Raymon mill, jet mill and so on.

2. Airflow grinding method

Airflow grinding method is the use of high-speed airflow to accelerate the material to supersonic speed, so that the material in the nozzle collision, friction and crushing. This method has fine particle size and high purity, but large equipment investment and high energy consumption.

3. chemical method

chemical method is a method of preparing silicon powder through chemical reaction, including gas phase method, liquid phase method and solid phase method.

1. gas phase method

gas phase method is through the silane gas oxidation reaction at high temperature, the generation of silica particles, the collection, processing to obtain silicon powder. This method has high product purity, narrow particle size distribution, but large equipment investment and high energy consumption.

2. liquid phase method

liquid phase method is through the chemical reaction in the solution, the generation of silica particles, after separation, drying to obtain silica powder. Commonly used liquid phase methods include sol-gel method, hydrolysis method, etc. This method has high product purity and controllable particle size distribution, but the process is more complex.

3. solid phase method

solid phase method is through the chemical reaction between solid materials, generate silica particles, by crushing, classification of silicon powder. This method has simple process and low cost, but the product purity is low.

4. synthesis method

synthesis method is a method of preparing silicon micropowder by combining the advantages of physical and chemical methods. The commonly used comprehensive methods are mechanical chemical method, physical chemical method and so on.

mechanochemical method is through the chemical reaction under the action of mechanical force, the generation of silicon dioxide particles, and then crushed, classified to obtain silicon powder. This method combines the advantages of mechanical crushing and chemical reaction, and the product has high purity and narrow particle size distribution.

physical and chemical method is a combination of physical and chemical methods, first in the solution to generate silica particles, and then by mechanical grinding or jet mill grinding to obtain silicon powder. This method has high product purity and controllable particle size distribution, but the process is more complex.

5. Conclusion There are many manufacturing methods for

silicon powder, and each method has its advantages, disadvantages and scope of application. When choosing a manufacturing method, it is necessary to consider factors such as product requirements, equipment conditions and production costs. In the future, with the continuous progress of science and technology and the improvement of environmental protection requirements, the manufacturing method of silicon powder will be continuously improved and optimized.

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