To provide a method for recovering nickel and cobalt by leaching laterite ore, in which iron is not precipitated as the thermodynamically unstable jarosite compound.
The method for recovering nickel and cobalt from laterite ore by performing atmospheric pressure leaching to the laterite ore includes the processes of: (a) after mining laterite ore, separating the ore into low magnesium-containing ore fraction and high magnesium-containing ore fraction; (b) slurrying the ore fractions separately; (c) performing a primary leaching to the low magnesium-containing ore fraction by using strong sufuric acid; and (d) performing a secondary leaching after the primary leaching, in which iron is precipitated as iron-oxide or iron-hydroxide by introducing the high magnesium-containing slurry, wherein the sulfur acid spouted during precipating the iron is used for leaching the high magnesium ore fraction.
COPYRIGHT: (C)2010,JPO&INPIT
GILLASPIE JAMES D
ADELE LEWS CORALIE
DAVID NEUDORF
STEVEN BARNETT
| JP2003514109A | 2003-04-15 |
Kurata Masatoshi
Satoshi Kono
Makoto Nakamura
Yoshihiro Fukuhara
Takashi Mine
Toshio Shirane
Sadao Muramatsu