Precious metal recovery

Simple but effective carbon regeneration kilns

Restoring fouled carbon is a more cost-effective and sustainable approach than continuously purchasing it new. With a simple, single-tube design and focus on high-quality components, our carbon regeneration kilns offer effective carbon restoration – and will last the life of you mine.

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Key benefits of our automated laboratories

  • Extend carbon life

    Our simple, low-temperature carbon-regeneration process avoids overheating or damaging the carbon during regeneration cycles. The result is high-reactivated carbon activity with enduring carbon life.

  • Cost-effective and efficient process

    Our process is simple and avoids overcomplicating the regeneration process with extra steps. For example, pre-drying of the carbon is not required; we use the entrained moisture to provide essential process steam. Taken together, it’s a cost-effective and efficient process that offers lowest overall lifecycle costs.

  • Low maintenance

    The low temperature and heat transfer rates employed in our process lead to low thermal stress on the kiln while slowing high-temperature corrosion. Oversized bearings, trunnions, and kiln tyres also increase dependability and promote long equipment life. In fact, our kilns often outlast the mine with only minimal maintenance requirements.

  • Reduce need for skilled labour

    We all know the mining industry needs more skilled labour. This lack can make it hard to attract the people you need to run your mineral processing lab, especially when the mine is in a remote location. With their reduced for human involvement, automated laboratories negate that challenge, ensuring a reliable and accurate flow of sample data, regardless of staffing concerns.

Our carbon regeneration kilns

Activated carbon is an effective – but expensive – concentrator of gold and silver owing to its high adsorption capacity in cyanide leach circuits. However, organic fouling of the carbon over time decreases the metal loading capacity of the carbon and results in precious metal loss. Our carbon regeneration kilns solve this problem by restoring the activity of fouled carbon, reducing the need to buy more carbon and lowering fouled carbon disposal costs. We offer throughputs of 0.5 to 20 tonnes per day, with custom larger kilns available on request, and various heating options (propane, natural gas, fuel oil, and electric).

Models

Comparison of our carbon regeneration kilns

Installed kW
60
120
Tube size (depth, inches x length, feet)
24 x 22
24 x 22
Overall dimensions (length x width x height, feet)
30 x 7 x 7
30 x 7 x 7
Approximate weight (lbs)
16,100
16,100

Carbon handling  

FLS carbon handling systems are designed to reduce carbon attrition through the process. All carbon transfer pumps feature recessed impellers for gentle transfer while all carbon transfer lines feature long sweep (5 dia.) elbows. Carbon handling tanks feature flanged and cone bottoms for smooth carbon removal with spay nozzles ensuring complete carbon extraction.  

 

Carbon sizing screen 

The vibratory carbon sizing screen is sized to the carbon transfer rate to provide optimal separation of fine carbon and carbon slurry, resulting in the appropriately sized carbon for the adsorption circuit.  

 

Mercury abatement systems 

For circuits containing mercury, mercury abatement systems are available that meet the most stringent emissions requirements.  

Maintenance & service of our carbon regeneration kilns

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 recovery, minimise downtime, and ensure the safe and efficient operation of your FLS systems and equipment.

Learn more about FLS service centres

Frequently asked questions

FAQs for column flotation cells

A carbon regeneration kiln is a specialist type of rotary kiln used to restore fouled activated carbon to its original adsorption capabilities.

Fouled carbon is heated to volatilise or decompose adsorbed impurities, cleaning and reactivating the carbon. It is then cooled before being reused. 

Carbon regeneration is more cost-effective than purchasing new activated carbon. Recycling carbon also reduces waste, and the environmental impact associated with activated carbon production. 

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