ISSN: 1003-6326
CN: 43-1239/TG

Vol. 21    No. 1    January 2011

Leaching behavior of metals from limonitic laterite ore by
high pressure acid leaching
GUO Xue-yi, SHI Wen-tang, LI Dong, TIAN Qing-hua
(School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China)
Abstract: The leaching behavior of metals from a nickeliferous limonitic laterite ore was investigated by high pressure acid leaching process for the extraction of nickel and cobalt. The effects of sulfuric acid added, leaching temperature, leaching time and liquid/solid (L/S) ratio on metals extraction were examined. More than 97% Ni, 96% Co, 93% Mn, 95% Mg and less than 1% Fe are extracted under optimum conditions. Analysis of the high pressure acid leaching residue by chemical and XRD analysis indicates that the residual iron and sulfur are mainly present in phases of hematite and alunite, respectively. The high pressure leaching process provides a simple and efficient way for the high recovery of nickel and cobalt from laterite ore, leaving residue as a suitable iron resource.
Key words: high pressure acid leaching; limonitic laterite; leaching behavior; nickel
Superintended by The China Association for Science and Technology (CAST)
Sponsored by The Nonferrous Metals Society of China (NFSOC)
Managed by Central South University (CSU)