How it works and what it targets
In dry classification, larger or heavier particles tend towards the coarse outlet under centrifugal action, while smaller or lighter particles follow the gas through the wheel. Size, density, shape and agglomeration all influence separation; a classifier is not a sieve with one fixed cut size for every material. Stable feeding and adequate dispersion are prerequisites for performance assessment.
Reference process steps
- 1Feed steadily and disperse agglomerates to establish a separable gas–solid flow.
- 2Adjust wheel speed, airflow and secondary air to separate coarse and fine streams.
- 3Collect streams separately and measure their size and mass for a classification balance.
Configuration and operating conditions
LNC design details
Face seals reduce coarse-particle bypass; secondary air cleans the separation zone and helps detach fines from coarse particles. Choose wheel, liner and wear-part materials for purity, abrasion and cleaning needs.
O-Sepa and throughput trade-offs
An O-Sepa route can be considered for coarser cuts and higher-throughput classification. Compare it with fine LNC separation using cut targets, bypass, recovery, pressure drop and footprint. A configuration name does not replace performance curves at the required conditions.
Information needed for selection
Provide full feed size distribution, density, shape, agglomeration, moisture, coarse-removal or dedusting targets, desired recovery at each outlet and throughput.
Discuss selection inputsTrial and acceptance considerations
Measure feed and each outlet, defining how cut size, recovery and classification efficiency are calculated. One efficiency percentage cannot describe the full separation curve.