Our gravity concentration equipment provides the most effective solution in the field of gravity separation for industry-best recovery of gold and other precious metals. Designed for versatile operation, it suits many applications and fits any circuit size.
Built on 40 years of innovation, our Knelson gravity concentrators are designed to capture the maximum amount of gold per cycle. They are the only enhanced gravity concentrator on the market with a fully fluidized bed, allowing for upgrading throughout the entire cone surface.
We have improved the design of our Knelson gold concentrators to increase uptime and facilitate easier maintenance. Unit internals are rubber-lined to protect against abrasion, while stainless steel parts offer better value and longer service life. The latest design also features fewer parts and an automated lubrication system to further reduce maintenance needs.
Unlike other gravity concentration equipment on the market, Knelson concentrators can operate at feed densities of up to 75% solids. This means they can be installed in multiple locations within the metal recovery process, making the system more versatile.
The Knelson™ Semi-Continuous Gravity Concentrator sets the benchmark for gravity gold recovery. Renowned for its superior performance in fine gold and precious metal recovery, it is the definitive choice for hard rock and alluvial mining operations worldwide.
Available in a range of model sizes, the concentrator supports capacities from laboratory scale to 1,000 tonnes of solids per hour. It integrates enhanced centrifugal force with a fluidised bed process, delivering consistently high recovery rates of gold, silver and platinum group metals – even under variable feed conditions.
The Knelson™ QS70 model is the highest-capacity batch concentrator on the market, capable of processing up to 1,000 tonnes per hour. This represents a 20% increase over the next largest model in our range and outperforms two of the largest competing units combined.
Whether scaling up production or optimising existing circuits, Knelson™ concentrators offer proven technology, unparalleled efficiency, and long-term operational value.
The Knelson™ Continuous Gravity Concentrator is engineered to exceed the operational limits of semi-batch recovery systems. Purpose-built for high-throughput mineral recovery, it is the only continuous concentrator leveraging proprietary fluidised-bed technology – eliminating inefficient flowing film separation and avoiding particle locking and dewatering at high G-forces.
Operating on the same proven principles as the Knelson™ Batch Gravity Concentrator, this unit provides a truly continuous concentrate stream while simultaneously processing new feed. Downtime for concentrate removal is eliminated, as discharge is managed by pinch valves at the base of the fluidised rings, allowing for seamless concentrate release without halting production.
The system incorporates automated control for real-time optimisation of key parameters – including fluidisation water, G-force, and cycle time – ensuring consistent performance across a broad range of plant conditions.
Highly versatile, the Knelson™ Continuous Gravity Concentrator is ideal for gold and PGM recovery, flotation concentrates, industrial minerals, tin and coal applications – including efficient ash separation. It delivers continuous, high-efficiency recovery with minimal operator intervention, making it a vital asset in any modern mineral processing operation.
Our patented GX concentrating cone lies at the heart of our latest-generation Knelson QS concentrators, an innovative step in metallurgical performance. Zone separator nozzles provide effective control and distribution of fluidisation water across the entire cone, facilitating the highest possible recovery of coarse and fine gold.
The GX cone features tangential introduction of fluidized water into the concentrating rings, avoiding ratholing and dead spots. It also allows thorough flushing of the unit without the need for expensive and unnecessary variable frequency drives.
We designed the Knelson gravity concentrator with a low centre of gravity and to be hung rather than supported from below, eliminating overall vibration. In contrast, similar products on the market can face problems with vibration if the feed is not properly diluted.
Knelson gravity concentrators are designed to reduce component parts, simplify construction, and reduce manufacturing time. These measures cut maintenance costs without impacting recovery rates or capacity.
Our Aftermarket Department offers reliable and timely supply of spares and wear parts, ensuring minimal downtime and optimal equipment performance. Our specialists are also readily available to provide ongoing operational support. Whether it’s technical advice, troubleshooting or circuit optimization, we work closely with mine site teams to ensure the longevity and efficiency of the equipment throughout its lifecycle.
Additionally, we offer comprehensive support services, including circuit audits, preventive maintenance programs, training for mine operators and maintenance personnel, and detailed reporting on equipment performance. Our goal is to help maximise productivity, minimise downtime, and ensure the safe and efficient operation of our clients’ mining assets.
Downstream processing of gravity-produced concentrate involves leaching. For a seamless gravity circuit operation, we recommend the Consep Acacia intensive cyanidation system. Featuring an up-flow fluidised reactor specifically designed for the leaching of Knelson concentrates, the Consep Acacia system creates the ideal solid-liquid interaction, maximising gold leaching reaction kinetics without the need for mechanical agitation or drum rotation, and typically achieving recoveries of more than 95%, often over 98%. Over 20 years, it has become the market leader in its field, maintaining an unblemished installation success rate with its reliability, simplicity and productivity.
FAQs for Gravity Concentrators