Introduction

The expansion of the semiconductor industry has resulted in approximately 30% -40% of materials being discarded in the form of scraps or waste chips during silicon wafer processing, leading to the waste of high-purity silicon resources and environmental pollution. The purification of primary silicon has high energy consumption and significant cost fluctuations, while the cost of recovering silicon powder is only 30% -50% of primary silicon and can reduce carbon emissions. The global carbon neutrality policy promotes the resource utilization of electronic waste. With the technological breakthrough of PNMP milling precision equipment, waste silicon wafers are efficiently converted into controllable particle size and low impurity silicon powder through mechanical milling, becoming a key path for the closed-loop of the industrial chain.

Working principle

The PNMP mill applies pressure and shear force to silicon wafers through the high-speed rotation of vertical grinding rollers and grinding discs, achieving micrometer level pulverization; The crushed silicon powder is separated by a turbine classification system, and the qualified particle size powder is collected. The coarse particles are automatically returned to the grinding chamber for cyclic processing to ensure uniform particle size.

Processing advantages

High compatibility grinding: The vertical grinding roller and grinding disc structure can stably grind high hardness silicon wafers, achieving micron level uniform grinding, suitable for photovoltaic and chip level silicon powder preparation;
Accurate particle size control: The grading system supports 15-100 mesh adjustment, flexibly matching the particle size requirements of different application scenarios;
Clean production: fully enclosed nitrogen protection combined with dust removal device to suppress dust diffusion and silicon powder oxidation, ensuring semiconductor grade purity;
Efficient operation and maintenance: The dual cooling technology of water and air avoids equipment overheating, and the quick opening design of the host door cover simplifies tool replacement and internal cleaning, reducing maintenance costs;
Durable and reliable: using SKF bearings, Siemens motors and other brand accessories to ensure long-term stable operation and reduce downtime losses;
Customized Expansion: Provides diversified accessories and production line solutions, which can be flexibly configured according to budget and recycling scale, achieving a closed-loop of cost reduction and efficiency improvement.