Forced-air flotation cells

Delivering nextSTEP performance in forced-air flotation

Featuring the patented nextSTEP rotor/stator, FLS forced-air flotation cells improve recovery and grade, while reducing power requirements by 15-40% compared to any other forced-air flotation cell design on the market.

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Key benefits of forced-air flotation cells

  • Improve mineral recovery and enhance grade

    The nextSTEP rotor/stator is located at the bottom of the flotation cell, resulting in a stabler froth surface and deeper froth layer. This improves mineral recovery and delivers better separation of valuable minerals from gangue, leading to a higher-grade concentrate.

  • Lowest energy consumption

    The shape and matched profile of the rotor/stator combination optimises energy transfer from the mechanism to the slurry. This design results in best-in-class energy efficiency, lower wear rates, and optimised metallurgical performance.

  • Long wear life

    Even wear patterns extend the nextSTEP rotor/stator’s operating life, reducing maintenance costs and downtime. The rotor can also run in reverse to further increase the mechanisms' life. In many cases, nextSTEP mechanisms demonstrates a wear life twice that of similar equipment.

Our forced-air flotation cells

FLS froth cameras provide a clear image and analysis of froth movement over the launder, allowing for improved control of the flotation circuit and further optimizing performance.

Automatically adjust recovery rate based on an algorithm that works with froth cameras and online sample analysers. 

Optimise the froth pull rate of the entire row with additional crowding to low pulling cells

Services of forced-air flotation cells

The experts at the FLS Minerals Testing and Research Centre help fine tune your flotation systems to ensure optimal performance. Equipped with a range of testing and analysis equipment, we determine the optimal sizing, configuration, and operating practices for your application. Operating flotation cells are supported by a global network of service centres, offering full-lifecycle technical assistance. Our service engineers travel regularly to sites for equipment inspections and audits, to supervise maintenance, and to deliver tailored training. Meanwhile, FLS spare and wear parts deliver long service life and ensure the performance of your attrition scrubbers does not degrade over time.

Learn more about FLS service centres

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Frequently asked questions

FAQs for column flotation cells

A forced-flotation cell is a type of flotation device used in mineral processing to separate valuable minerals from waste (gangue). They use an external air blower to introduce air into the slurry through a hollow shaft and holes in the rotor. The rotor/stator shear and disperse the air into small bubbles onto which mineral particles attach and rise to the surface and can then be collected into overflow launders. In comparison, self-aspirated flotation cells pull air into the slurry via a vacuum created by the motion of the rotor. 

Forced-air flotation allows for better control over air flow and distribution than self-aspirated flotation cells, allowing optimised mixing of air and slurry for enhanced contacting and attachment. Rotor/stators are located at the bottom of the cell, creating a stabler and deeper froth layer for enhanced recovery and higher-grade concentrate production. The rotor location also helps reduce any sanding build-up and the bottom of the cell.  

Forced-air flotation cells can be used to separate a wide range of metals and minerals and in rougher, scavenger, and cleaner flotation applications. 

Yes! Converting to nextSTEP flotation is simple and low risk. The existing mechanism assembly is utilised. Rotor and stator are attached with adaptor flange and baseplate respectively, and drive sheaves replaced to optimise speed. The FLS conversion process is thorough and proven - with many successful retrofits already undertaken in flotation cells ranging in size for 1.7m3 to 250m3.

FLS offers rectangular nextSTEP flotation cells with active volumes of 1.7m3 to 2.8m3 and round flotation cells with active volumes from 5 m3 to 600m3.

The main factors that drive flotation cell selection are required retention time, desired tonnage, percent solids used for processing, specific gravity of the solids, and estimated concentrate pull rate. These values can be determined by performing thorough laboratory or pilot testing of representative feed material.