Conveying ultrafine powders (e.g., <75 μm): which conveyor type is generally preferred for reliable transport over distance?

Introduction / Context:
Very fine powders fluidize easily and can dust or segregate on belts and in screws. Pneumatic conveying suspends particles in air, enabling controlled, enclosed transport.

Concept / Approach:
Pneumatic systems (dilute or dense phase) provide high enclosure, minimal spillage, and low mechanical degradation for ultrafines. Belts suffer from windage and dust; screws may compact or smear fine powders and have higher leakage/dusting at clearances.

Final Answer:
Pneumatic conveyor