Process for extraction of metal from an ore or concentrate containing nickel and/or cobalt
AssigneeCominco Engineering Services Ltd.
InventorDavid L. Jones
Life of this patent
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Abstract
A process for the extraction of metal from an ore or concentrate which contains nickel and/or cobalt values and other metals, comprises subjecting the ore or concentrate to acid leaching under pressure at pH≦2 to obtain a liquor containing nickel and/or cobalt values, subjecting the liquor to a first precipitation stage at pH of about 5 to 6 to produce a solid containing non nickel and non cobalt metals and a resultant solution containing the nickel and/or cobalt values and subjecting the resultant solution to a second precipitation stage at a pH of about 7 to 8 to produce a solid containing nickel and/or cobalt.
Claims34
A process for the extraction of metal from an ore or concentrate, containing nickel and/or cobalt values and other metals, comprising the steps of:
- subjecting the ore or concentrate to acid leaching under pressure, at pH≦2, to obtain a liquor containing nickel and/or-cobalt values in addition to non-nickel and non-cobalt metals;
- subjecting the liquor to a first precipitation stage at a pH of about 5 to 6 to produce a solid containing the non-nickel and non-cobalt metals and a resultant solution containing the nickel and/or cobalt values;
- subjecting the resultant solution to a second precipitation stage at a pH of about 7 to 8 to produce a solid containing nickel and/or cobalt and a nickel and cobalt depleted liquor, wherein said acid leaching under pressure comprises pressure oxidation in the presence of oxygen and an acidic solution containing halide and sulphate ions.
Dependencies are inferred from the claim text.