HydroFloat® Flotation

Eriez Flotation Division’s Managing Director Eric Bain Wasmund recently spoke about the benefits of Coarse Particle Flotation at the Conference of Metallurgists. 

View the full presentation here. 


The first in fluidized-bed flotation with more than 50 units installed worldwide!

Eriez, a world leader in separation technology, has designed the new HydroFloat® Separator for coarse particle mineral concentration delivering the capacity of a density separator while maintaining the selectivity of a flotation device. Using a novel aeration system to disperse fine bubbles into a fluidized-bed environment, the HydroFloat Separator significantly increases the selective recovery of coarse particles by applying flotation fundamentals to gravity separation.

Can be applied to:

  • Coal
  • Iron Ore
  • Industrial Minerals
  • Base Metals
  • Sulfides

Applications include:

  • Coarse Recovery in Split-Feed Flotation Circuits
  • Tailings Scavenging
  • Flash Flotation in Grinding Circuits


The HydroFloat® Separator is an aerated fluidized-bed (or teeter-bed) separator. The synergistic effect of combining flotation with gravity concentration results in an outcome that cannot be achieved by either approach alone.

Air bubbles are dispersed by the fluidization system, percolate through the hindered-setting zone and attach to the hydrophobic component altering its density and rendering it sufficiently buoyant to float and be recovered. The use of the dense phase, fluidized bed eliminates axial mixing, increases coarse particle residence time and improves the flotation rate through enhanced bubble-particle interactions. As a result, the rate of recovery is high for both fully-liberated and semiliberated particles.

HydroFloat® Separators Improve Coarse Particle Recovery through:

  • Increased bubble/particle collision rates
  • Increased bubble/particle sliding time
  • Increased residence time
  • Decreased mixing
  • Decreased turbulence and detachment
  • Decreased buoyancy restrictions

Mike Mankosa, Ph.D, and Eriez Executive Vice President of Global Technology, co-authored three technical papers at the 2016 International Mineral Processing Congress (IMPC) focusing on the various coarse particle flotation applications.

Read and download the paper, titled:

View all publications on our Technical Papers page.

Laboratory-scale HydroFloat® units are available for small-scale testing on Eriez' Lab Equipment website.




    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.

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    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.

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Copper 2019 - Newcrests Industry First Application of Eriez HydroFloat Technology for Copper Recovery

Originally presented at Copper 2019. In the face of declining copper head grades and a tightening regulatory environment around the use of wet tailings dams, the processing of copper ores at coarser particle sizes has become a focal point for the industry.
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COM 2020 presentation -Regino et al

Slide deck for Regino et al HydroFloat case-study at Cozamin
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Regino et al COM 2020 HydroFloat -final

Paper on Cozamin case-study looking at the tail scavenging and coarse gangue rejection application for the HydroFloat
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Cadia HydroFloat Case Study

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Cadia HydroFloat Case Study (Spanish)

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Flotation taking its coarse - Mining Magazine

Originally appeared in Mining Magazine, August 2019. As ore grades decline, mining companies are looking for ways to improve the processing efficiency of these ores and reduce treatment costs. Coarse flotation is one solution, finds Ailbhe Goodbody
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Coarse-particle flotation applied to copper sulfide ores

Presented at Perumin 2017 and was published in Mineria Magazine (Peru) 2018
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Eriez Fertilizer

Eriez Flotation Division has developed several technologies that can improve the separation of fertilizer minerals through flotation.
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Flotacion de particulas gruesas aplicada a minerales sulfurados de cobre

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The Benefits of Coarse Particle Flotation

Test work shows there are numerous benefits not just in reducing capital and operating costs, but also for improving sustainability and environmental efforts.
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Hydrofloat Separator Brochure

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Zanin et al, Procemin 2015, HydroFloat exploits
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New Approaches in Gold Recovery - Technical Bulletin

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Evaluacion del HF flotacion de particulas gruesas Expomin2017

HydroFloat Presentation at Expomin, Guadalajara 2017
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HydroFloat paper from Expomin 2017 in Guadaljara
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Coarse particle flotation CMP Toronto 2017-20170902

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White Paper: A New Paradigm in Sulfide Processing

Originally appeared in Engineering & Mining Journal. By classifying flotation feed at a point where coarse recovery deteriorates, the existing flotation circuit can be optimized to improve performance.
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A New Paradigm in Sulphide Processing

By classifying flotation feed at a point where coarse recovery deteriorates, the existing flotation circuit can be optimized to improve performance.
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This Changes Everything: Coarse Partcile Flotation

Radically improve the traditional processing circuit using Coarse Particle Flotation. Recover particles as large as 800 microns with as little as 1% mineral surface expression.
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Meeting the Needs of an Exacting Market: Potash

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Energy Reducing Flotation Improvements

HydroFloat and StackCell systems radically improve separation and recovery of Coarse & Fines particles.
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ALS Metallurgy CMP 2017 - Coarse Particle Flotation

HydroFloat Presentation by Peter Mehrfert ALS Kamloops, at CMP 2017
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Mehrfert CMP2017 - Coarse Particle Flotation Paper

Peter Mehrfert's (ALS Kamloops) paper on the HydroFloat, presented at the National CMP in Ottawa, 2017
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Significance of Exposed Grain Surface Area in Coarse Particle Flotation of Low-Grade Gold Ore With The HydroFloat Technology

Originally presented at IMPC 2016 by Mike Mankosa, Ph.D (3 of 3)
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Implementation of the HydroFloat Technology at the South Fort Meade Mine

Performance of this hydraulic separator in the field
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Testing of the HydroFloat Separator for Coal Cleaning Applications

This article describes the theoretical basis for the development of the HydroFloat separator and provides an overview of performance data obtained from recent field trials.
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Flotación de Finos y Gruesos Aplicada a la Recuperación de Minerales de Cobre

Tamaño de las partículas: lograr mayor las recuperaciones metalúrgicas de flotación
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Flotation Technology for Coarse and Fine Particle Recovery

Challenges associated with conventional froth flotation equipment
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Coarse Gold Recovery Using Flotation in a Fluidized Bed

Eriez has developed a flotation cell that uses fluidized water to enhance flotation of coarse particles.
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HydroFloat®: Una Nueva Tecnología Eco-Eficiente para el Procesamiento de Oro

HydroFloat®: Una Nueva Tecnología Eco-Eficiente para el Procesamiento de Oro
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Split-Feed Circuit Design for Primary Sulfide Recovery

Originally presented at IMPC 2016 by Mike Mankosa, Ph.D (2 of 3)
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