Metso introduces sustainable copper sulfide concentrates leaching process

Metso has announced the launch of its Cu POX leaching process, designed to enhance copper extraction efficiency while minimizing environmental impact. This advanced hydrometallurgical method addresses the industry’s evolving needs as ore compositions change and sustainability demands increase.

The Cu POX process is specifically designed for the treatment of copper sulfide concentrates at lower capacities. It is centered around Metso’s proprietary OKTOP® Autoclave unit, which facilitates the oxidation of copper concentrate under high pressure and temperature. This process generates a copper-bearing pregnant leach solution (PLS), which is further processed through solvent extraction and electrowinning (SX-EW) to recover high-purity LME Grade A cathodes.

“Copper sulfide minerals require specialized leaching conditions to achieve high recovery rates. Metso’s Cu POX leaching technology utilizes high-temperature oxidation to convert sulfide sulfur into sulfate and sulfuric acid, ensuring efficient copper dissolution. This process delivers copper recovery rates of up to 99%, optimizing metal extraction while reducing environmental impact through emissions reduction and efficient resource use,” said Petteri Pesonen, Technology Manager, Copper Hydrometallurgy at Metso.

The Cu POX process is designed for flexibility and scalability, accommodating various capacities and raw material compositions. Its pre-engineered process and equipment package allow for rapid production ramp-up and seamless integration with existing SX-EW infrastructure. Additionally, the Cu POX plant can be implemented to enhance current heap leaching operations by supplementing or replacing depleting heap leaching PLS production.

Metso offers comprehensive support for Cu POX implementation, including batch testing, modeling, pilot testing, engineering, equipment supply, plant commissioning, and operator training. The company also provides ongoing services, spare parts, and digital solutions to optimize process efficiency and plant performance.

Source and Photo: Metso