Yuan Lei tells you about the production technology of superfine silicon powder.

Release time:

2024-01-29 09:37


Yuan Lei tells you about the production technology of superfine silicon powder.


Silicon powder is a functional powder material processed from quartz. It has high insulation, high thermal conductivity, high thermal stability, acid and alkali resistance, wear resistance, low thermal expansion coefficient, low dielectric constant and other characteristics. It is widely used in copper clad laminate industry, epoxy plastic sealing material industry, electrical insulation material industry and adhesive industry.



1, silicon powder production process.
The production of silicon powder is mainly based on physical crushing, which can be divided into dry process and wet process:
  • Dry process flow: feeding → grinding → classification → collection → packaging;
  • Wet process: feeding → grinding → drying → depolymerization → classification → collection → packaging.
Dry product process is simple, low production cost, the general silicon powder production enterprises are selected this process.
Compared with dry products, wet products need drying and depolymerization process, the process is complex, the production cost is higher, less enterprises use this process, for the cut point (large particle cutting point) below 5 microns ultra-fine and need surface treatment products are more suitable for the use of this process.


2. Silicon powder grinding equipment
For the dry process, grinding and classification equipment is critical.
(1) Grinding equipment
Silicon powder grinding equipment will be mainly selectedBall MillThe energy consumption of the ball mill is relatively low and the production capacity is large.
For some products with high purity requirements, you can usestream millBecause the gas flow mill will not introduce the grinding medium, but the gas flow mill energy consumption is relatively high, the production capacity is low.
(2) Grading equipment
The silicon micropowder classification equipment is a general air classifier, which not only affects the cut point of the product, but also affects the grinding efficiency and energy consumption. Because in the grinding process, often only a part of the powder to meet the particle size requirements, has reached the particle size requirements of the product if not separated out in time, it will cause the material is broken, and this part of the powder will be too fine and easy to agglutination again into large particles, thus affecting the grinding efficiency.
In order to produce products with low cut point, the requirements for equipment are relatively high. On the one hand, the crushing efficiency of the equipment should be high enough to produce enough fine particles. On the other hand, the classification ability of the classifier should be strong enough and the classification accuracy should be high enough, so as to ensure that the fine particles that have been crushed in place can be fully classified into the product without bringing in large particles (I. e., ensuring cut point).


3, silicon powder production technology status.
In fact, for the same process, the finer the particle size of the product, the lower the cut point, the higher the energy consumption, the lower the production energy, the more serious the equipment wear, the more obvious the increase in production cost, and the higher the cost.
Taking the dry production of silicon micropowder by ball mill as an example, the relative production capacity changes with the cut point (taking the product production capacity of 25μm cut point as 100) as shown in the following figure, it can be seen that the production capacity decreases sharply with the gradual decrease of the product cut point.


Variation of silicon powder production capacity with cut point

In recent years, with the progress of domestic equipment, only in terms of particle size, some domestic silicon micropowder manufacturers can already produce 13μm cut silicon micropowder products, only a few domestic and foreign manufacturers can produce 8μm cut and 6μm cut products, while only a few domestic and foreign manufacturers can master this technology for 5μm cut, 4μm cut and 3μm cut products. For example, Jiangsu Lianrui New Materials Co., Ltd. is one of the few enterprises at home and abroad that can produce 8μm cut, 6μm cut, 5μm cut, 4μm cut and 3μm cut series products.





Tell, cut, product, silicon micropowder, equipment, process, grinding, production, classification,.

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