Sunday, 29 March 2020
Eriez® Case for Coarse Flotation

Eriez® Case for Coarse Flotation

The Eriez® Flotation Division (EFD) provides advanced engineering, metallurgical testing and innovative flotation technology for the mining and minerals processing industries. Most recently, EFD has concentrated on improving flotation efficiency, especially in areas where conventional technology comes up short. Eriez is currently working with industrial partners to quantify the benefit of applying their coarse fluidized-bed flotation technology, the HydroFloat™ Separator, to base metals and sulphides.

Eriez HydroFloat has the potential to revolutionize concentrator design. This technology synergistically combines fluidized-bed separation with flotation to achieve a level of recovery that cannot be attained using conventional technologies alone. As a result, valuable minerals can now be recovered at a size approaching and exceeding 850 microns. This ability has a direct positive impact on concentrator capacity and profitability.

In the time-tested traditional approach, minerals are very finely ground until nearly complete liberation is achieved to facilitate recovery in conventional flotation cells. In comparison, the HydroFloat operates treating particles at a size an order of magnitude larger. It has the ability to recover both liberated and composite particles with minimal mineral surface expression. The resultant increase in grind size has the direct benefit of lowering grinding costs and simultaneously increasing plant capacity.

One of the many large-scale pilot plants installed around the globe

One of the many large-scale pilot plants installed around the globe

Multiple large-scale industrial pilot plants have been installed and have shown that the HydroFloat technology is able to produce a reject that is essentially devoid of value, or contains so little value that further grinding is uneconomical. This scavenging ability is a result of the higher flotation rates derived from the synergistic effect of combining flotation with fluidized-bed separation. As a result, only the particles recovered by the HydroFloat need further grinding and the coarse tail can be discarded – leaving more room for additional feed.

University data show that when the HydroFloat technology is implemented directly in the grinding circuit of a typical concentrator, there is the potential to increase capacity by up to 25% depending on the liberation and hardness characteristics of the ore. The pilot plant studies have also shown there is clear benefit when using this technology to scavenge the final tail from existing concentrators to recover coarse values that are typically missed by conventional mechanical cells.

This revolutionary technology from Eriez is expected to lead to a paradigm shift in how concentrators are designed. The direct benefits are clear with an increase in plant capacity and simultaneous reductions in grinding costs for energy and media consumption. The indirect benefits of producing a coarse tail may be even greater in terms of improved water recovery and the resultant reduction in carbon footprint.

EFD provides advanced engineering, metallurgical testing and innovative flotation technology for the mining and minerals processing industries. Strengths in process engineering, equipment design and fabrication position EFD as a leader in minerals flotation systems around the world.  Eriez manufactures and markets these products through 12 international facilities located on six continents.  For more information, please call 613 8401 7400, email or visit


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