In mineral classification during beneficiation, which fluid medium is commonly employed to carry and stratify particles?

Introduction / Context:
Classifiers separate particles based on settling velocity in a fluid. Depending on the size range and the process, the fluidizing medium can be air or water.

Concept / Approach:
Hydraulic classifiers and hydrocyclones use water; they are ubiquitous for ores and sands. Air classifiers and cyclones use air for dry separations and are preferred when water is undesirable or when drying is costly. The choice depends on particle size, density, moisture sensitivity, and downstream processing.

Final Answer:
Either air or water (depending on device and size range)