Project Background: With the rapid development of semiconductor packaging, copper clad laminates (CCL), and the photovoltaic industry, market requirements for high-purity silica micropowder (crystalline quartz / fused silica powder) have become increasingly stringent. A well-known U.S. high-performance materials supplier planned to expand its electronic-grade silica micropowder jet mill production line and required a grinding system capable of high capacity, ultrafine particle size, and zero metal contamination.
Core Challenges:
- Extremely high hardness: Silicon micropowder has a Mohs hardness of up to 7, causing severe abrasion to conventional metal equipment.
- Strict purity requirements: As the product is used in high-end electronic applications, iron (Fe) and other metal contamination must be strictly avoided.
- Particle size control: The material must be precisely controlled at D90: 9.8 μm, with a very narrow particle size distribution.
Solution: Epic Powder Fully Ceramic-Lined Silica Micropowder Jet Mill Production Line
To meet the customer’s demanding requirements, Epic Powder designed a customized automated production line centered on the MQW Series Fluidized Bed Jet Mill.
Key Configuration and Process
- Equipment model: Epic Powder MQW Series Jet Milling Production Line
- Full ceramic protection (critical):
All material-contact parts—including the feeding system, inner wall of the grinding chamber, classifier wheel, and discharge pipelines—are fully lined with alumina or silicon carbide ceramics.
This design completely eliminates metal contamination caused by mechanical wear during grinding, ensuring excellent product whiteness and purity. - High-efficiency classification system:
Equipped with a high-precision vertical single (or multi) turbine classifier. The classifier wheel speed is controlled by variable frequency drives, achieving 100% interception of oversized particles.
Key Project Parameters and Results
After on-site commissioning and continuous operation, the production line fully met—and in some aspects exceeded—the customer’s expectations:
- Processed material: High-purity quartz sand / silicon micropowder
- Final product fineness: D90: 9.8 μm (smooth particle size distribution, no coarse particle contamination)
- Production capacity: 500 kg/h (stable output)
- Metal contamination increase: Nearly zero (meets electronic-grade packaging material standards)
- Energy efficiency: By optimizing nozzle configuration and system pressure drop, overall energy consumption was reduced by approximately 15% compared with conventional jet mills.