The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 14, 2009
Filed:
Aug. 14, 2007
Houyuan Liu, Shortland, AU;
Damien Gary Ignatius Krebs, Kengsington, AU;
Houyuan Liu, Shortland, AU;
Damien Gary Ignatius Krebs, Kengsington, AU;
Abstract
A process is described for the recovery of nickel and cobalt from a nickeliferous laterite ore including the steps of: providing a nickeliferous laterite ore and separating that ore into its low magnesium limonite fraction and high magnesium saprolite fraction; treating the limonite fraction in acid solution in a primary high pressure leach step to produce a primary leach slurry; adding the saprolite fraction to the primary leach slurry to initiate precipitation of iron as goethite and/or hematite, while simultaneously releasing further acid from the iron precipitation, to effect a secondary atmospheric leach step, producing a secondary leach slurry; wherein all water used to prepare the ore slurries and/or acid solutions has an ionic composition that substantially avoids jarosite formation.