Introducing the

Sepro
Frontier Bowl

Innovative new bowl geometry with a parabolic riffle profile

20% higher recovery on high-grade ore with coarse gold particles
50% higher recovery on low-grade ore with fine gold particles
47% reduction in cyclone overflow grade in industrial trials

Sepro Frontier Bowl gold recovery comparison chart

The Sepro Frontier bowl achieves significantly higher gold recoveries than the Knelson™ and the Falcon bowl under many test conditions.

Whether you’re looking to recover coarse gold particles or fine gold, the Frontier bowl is likely going to immediately improve your operation’s output.

The Sepro Frontier utilizes the concentration mechanisms from both the Knelson™ and Falcon concentrators. This makes the Sepro Frontier Bowl a superior choice in many mining operations.

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How does it work?

The concept behind the parabolic riffle profile was to create a bowl with riffles on both sides of the dynamic slurry face. We wanted a smooth path for slurry flow up the bowl wall. The bottom riffles begin with a relative angle of 30 degrees and progressively decrease in angle until the top riffles are vertical.

The bottom riffles are exposed to the slurry flow, creating an eddy current zone of high turbulence. The top riffles are not directly exposed to the slurry flow, creating a non-turbulent zone of particle separation and recovery. In between is a transition zone where the angle of the bowl wall is equal to the angle of the dynamic slurry face.

This design dramatically improves overall gold recovery across a range of ore types, gold grades, and particle sizes.

Have You Ever Wondered?

There have been anecdotal reports that the Knelson™ recovers more coarse gold particles, and the Falcon recovers more fine gold particles. Previously, no one has published any rigorous, controlled experiments at the industrial scale to determine the relative performance of these two types of gold centrifuges for both fine and coarse gold.

What if you could perform better for both?

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Watch the breakdown of our whitepaper by
Andrew Gillis, PhD

Improve Your Operations with Minimal Hassle

Sepro produced a Frontier™ bowl that fit as a direct replacement part in a Knelson™ XD48 gravity concentrator. The bowl was installed at a gold mine in North America currently operating two Knelson™ XD48 gravity concentrators with the standard Knelson™ riffle profile.

Here’s what we found.

Tests were run on each bowl over two days, using the standard plant settings for feed rate, bowl speed, fluidization flow rate, and concentration cycle times. The standard Knelson™ bowl achieved a cyclone overflow grade of 11.0 g/t Au while the Sepro Frontier™ bowl reduced the cyclone overflow grade to 5.8 g/t Au, a 47% improvement. This resulted in a 3x improvement in gravity gold recovery.

Sepro Frontier Gold-Copper Ore and Gold-Silver Ore comparison chart In pilot testing, we also observed 20% higher recovery on high-grade ore and 50% higher recovery on low-grade ore.

The Frontier™ bowl achieved these recovery improvements under all test conditions. From this information, we can infer that combining both concentration mechanisms (along with a smooth transition zone) dramatically improves overall gold recovery across a range of ore types, gold grades and particle sizes.

Based on the significantly higher performance of the Frontier™ bowl, it is a clear choice to use over any competing designs in the market.

Here are some of the benefits of the Frontier bowl as compared to traditional bowl profiles

20% higher recovery on high-grade ore with coarse gold particles
47% improvement in industrial trials, reducing cyclone overflow grade from 11.0g/t Au to 5.8 g/t Au
50% higher recovery on low-grade ore with fine gold particles
Improved gold recovery from 18% to 54%, a relative increase of 300%

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