Metso has unveiled its groundbreaking Cu POX leaching solution, a cutting-edge hydrometallurgical process designed to enhance copper sulphide leaching efficiency while prioritizing environmental sustainability. This innovative technology addresses the growing challenges of changing ore compositions and depleting deposits, offering a scalable and flexible solution for the mining industry.
At the heart of the process is Metso’s proprietary OKTOP Autoclave unit, which oxidizes copper concentrate under high pressure and temperature. This generates a copper-bearing pregnant leach solution (PLS), which is further processed through solvent extraction and electrowinning (SX-EW) to produce high-purity LME Grade A copper cathodes.
Petteri Pesonen, Metso’s Copper Hydrometallurgy Technology Manager, explained, “The Cu POX leaching process uses high-temperature oxidation to convert sulphide sulphur into sulphate and sulphuric acid, ensuring efficient copper dissolution with recovery rates of up to 99%. It also minimizes environmental impact by reducing emissions and optimizing resource use, such as through closed-loop water systems.”
The technology is designed to integrate seamlessly with existing SX-EW infrastructure and can enhance heap leaching operations by supplementing PLS production as resources diminish. Metso provides comprehensive support, from batch testing and pilot trials to plant commissioning and training, ensuring a smooth implementation process.
In a related development, Metso secured a contract with Barrick Gold in September 2024 to supply key process equipment for the Lumwana copper project in Zambia, further solidifying its position as a leader in copper processing innovation.
