Eriez developed the HydroFloat Separator specifically to treat coarse material. With this new separator, process engineers can now maximize efficiency by designing split-feed flotation circuits where coarse material is treated separately from the fines.
The development of the HydroFloat was based on applying flotation fundamentals to teeter-bed separation. The presence of the fluidized bed increases collision rates beyond that which can be obtained in open flotation cells. As a result, the HydroFloat excels as a scavenging device.
Columns are often discounted as roughers because of the beliefs that a) mechanical cells will provide a higher level of recovery, and, b) higher recovery provides more revenue than higher grades. For simple ores, this is may be true. For more complex ores containing impurities which translate into additional treatment and refining charges, or for mines located in very remote regions, the benefit of being able to produce high grade concentrates even at the expense of a slight reduction in recovery, may make economic sense.