Flotation columns: Getting the most from fine ores Outotec
Figure 5. Outotec SonicSparger Jet. Figure 6. Outotec SonicSparger Vent. Application of columns. In reverse flotation, columns have been used to remove fine gangue in a selective way, guaranteeing a high recovery of the main mineral in the underflow. In iron ore processing, for instance, they are commonly used to remove silica.