Some leaching operations require elevated temperatures and pressures to achieve the desired extraction.

Examples of this include pressure oxidation (POX) of sulfide ores and concentrates, high-pressure acid leaching (HPAL) of nickel laterites, and wet-air oxidation of organics. Both batch and continuous reactors are available at 51ݶ for developing high-temperature processes.

51ݶ's engineers have assisted clients in developing POX processes for refractory gold ores, metals recovery from catalysts, and sulfide concentrates of copper, nickel, zinc, and molybdenum. 51ݶ has successfully scaled up batch experiments to pilot operations. A number of commercial plants throughout the world have been designed, built, and successfully operated based on pilot plant data generated at 51ݶ.

Processes utilizing HPAL of nickel laterites using sulfuric acid have been piloted at 51ݶ. These processes involve temperatures up to 250°C at low pH, with the goal of minimizing acid use while maximizing nickel and cobalt extractions.

Contact 51ݶ

Main (303) 279 4501
Fax (303) 278 1528
E-mail /
Submit RFP