Si Powder 160M

With the rise and rapid development of my country's polysilicon and organic silicon industries, the demand for silicon powder processing and production continues to expand, which greatly increases the potential risk of explosion during silicon powder processing. The fine powder control requirement in the domestic silicone industry is: 45 μm fine powder ≤ 3.0%, but in actual production, the content of 45 μm fine silicon powder is generally 10%~20%.

High Purity Silicon Metal Powder 160M

1. Conditions for explosion during silicon powder processing
       Silicon powder processing is to process large silicon blocks into powders with smaller particle sizes. The smaller the particle size of silicon powder, the easier it is to suspend, the larger the surface area, the faster the combustion speed, the faster the pressure rise, and the greater the explosion pressure. Because the initial explosive air wave of dust will raise the deposited dust, it will reach the explosive concentration in the new space and generate a secondary explosion. Such continuous explosions can cause great damage.

Ferrosilicon Powder 160m

2. The process of dust explosion during silicon powder processing
      crushing or grinding process
      According to the different principles of powder making and the nature of the force, the crushing process is divided into methods such as extrusion, impact and grinding. In general, crushing and grinding operations require the use of multiple forces at the same time. The crushing process is either due to air separation (such as a vertical mill that selects silicon particles of 48 mesh to 325 mesh under the action of wind, and sends them to the dust collector in the equipment) or due to mechanical force (such as a cyclone mill system) It will cause a large amount of dust to fly and form a silica powder cloud, that is, the dust suspended in the equipment is within the explosive concentration range.
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Silicon Metal Powder 160M

High Purity Silicon Metal Powders 160M

At present, silicon powder transportation basically adopts continuous and automated transportation. The main conveying equipment includes bucket elevators, belt conveyors/chain bucket conveyors, electric vibration conveying and pneumatic conveying. During the transportation process, the level difference of the transported dust material and the size of the dust removal wind determine the degree of dust flying and the density of the gas phase. The greater the density of the gas phase, the greater the danger. In addition, static electricity will also be generated due to the impact of chains and chain buckets during transportation by bucket elevators, and friction and impact between materials, equipment, and pipes. For example, friction in gas transportation and belt transportation will generate static electricity.

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