07-14
If you've noticed coarse particles—material that should be reporting to the underflow—showing up in your hydrocyclone overflow, you're facing one of the most common and frustrating problems in mineral processing. Coarse solids in the overflow (often called "overflow run coarse" or "coarse misplacement") impacts downstream processes, reduces recovery, and can lead to environmental compliance issues.
The good news: most causes are identifiable and fixable—often without replacing the entire cyclone. This article walks through the most common causes, diagnostic approaches, and corrective actions, drawing on both industry research and decades of real-world field experience.