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    Overview. High Pressure Acid Leach (HPAL) is a process used to extract nickel and cobalt from laterite ore bodies. The HPAL process utilizes elevated temperatures (roughly 255 degrees Celsius), elevated pressures (roughly 50 bar or 725 psi), and sulfuric acid to separate nickel and cobalt from the laterite ore.

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    High Pressure Acid Leaching (HPAL) The technology of Pressure Acid Leaching (PAL) which was developed in Cuba (Moa Bay) in the 1950's using a process now owned by Sherritt. It was developed for laterite ores which are difficult to concentrate. Process Challenges

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