Increased fine particle recovery
Specifically designed to maximise fine particle recovery, the Dorr-Oliver flotation cell is the most energy efficient, technically advanced, forced-air flotation machine on the market. Its air dispersion capabilities exceed all competitive forced air designs – an important consideration for fine particle recovery.
Recover more fine particles with forced-air flotation
Superior performance in forced-air flotation
Flotation is about creating the proper energy dissipation rate in the cells to obtain optimal contact between the air bubbles and the particles for extracting the minerals. The function of the rotor/stator is to make bubbles from the forced air, suspend the particles, and create an environment for bubbles and particles to make contact and rise to the top as froth for concentration and collection.
Our forced-air flotation design features a streamlined, high-efficiency rotor that works as a very powerful pump. Working together the stator, these components generate an energy-intensive turbulence zone in the bottom of the cell. The forced-air design allows for control of the air flow.
The well-defined turbulence zone results in multiple passes of unattached particles through the highest energy dissipation area of the cell – where fine particles are driven into contact with the air bubbles.
The creation of effective solids suspension in the cell ensures the ability to restart in even the most difficult of applications.
The stator design, in addition to providing good separation of the cell zones, also serves to redirect the rotor jet uniformly across the tank. This allows dispersion, or distribution, of the maximum amount of air into the cell without disturbing the surface – an important consideration for fine particle recovery. The air dispersion capabilities of our Dorr-Oliver cell design exceed all competitive forced-air designs.
Improved froth handling and high-concentrate grade
By containing the intense circulation energy at the bottom of the cell, the upper zones of the cell remain quiescent, or passive, to maximise recovery of marginally attached coarse particles and minimise the carriage of undesired material.
We have equipped our forced-air flotation tank cells with a uniquely designed, high-efficiency radial launder system that accelerates froth removal as it reaches the surface. Bubble-particle aggregates travel vertically through the froth lattice. The high-efficiency radial launder is shaped to receive the froth uniformly from the cell surface, as well as from the typically heavy-loaded area near the centre of a forced-air machine. On passing over the lip, the froth accelerates to the perimeter of the cell. This unique design rarely requires launder water.
- Well-defined quiescence zone reduces entrainment and gives stable froth
- Maximised concentrate grade
- Maximum froth recovery and reduced coarse particle drop-back through high-efficiency radial launder
- Optimised froth transport
Superior metallurgy, greater availability
The two factors having the strongest impact on a flotation circuit’s performance are metallurgical recovery and flotation cell availability. Our forced-air flotation machines provide superior performance in both of these important areas, while offering additional, distinct advantages.
Superior metallurgical performance: Intense recirculation in a well-defined mixing zone multiplies the chances of contact between mineral particles and air bubbles, providing for greater mineral recoveries and higher concentrate grades.
Greater availability: Non-clogging design of the rotor reduces maintenance requirements, minimising failure, and increases availability. Our flotation mechanisms also can be removed for maintenance without process interruption.
High air dispersion capability: High-shear rotor-stator combination provides a wider range of airflow adjustment than competitive systems, and results in greater control of the flotation process.
Low reagent costs: Air is a natural reagent in the flotation process. Having a wide air dispersion capability permits you to fine-tune your flotation plant to deliver the optimum value for your process.
Easier restarting mechanism: Overhung stator design and the vortex rotor profile keep the pumping channels free of settled solids. This makes restarts easier after unplanned shutdowns.
Lower power consumption: Streamlined pump-action vortex profile rotor and overhung-type stator are more energy-efficient than competitive forced-air flotation units.