Selective pressure leaching of Fe (II)-rich limonitic laterite ores from Indonesia using nitric acid

► Nitric acid pressure leaching was used to treat Fe (II)-rich limonitic laterite ores. ► Ni, Co and Fe can be extracted selectively under milder pressure leaching conditions. ► Major parameters affecting extractions of target elements were determined. ► Behavior of iron as well as nickel and cobalt in the leaching process was clarified. ► A certain amount of acid can be saved and low residual acid is needed in the process.