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:
Aug. 26, 2008
Filed:
Mar. 14, 2003
Houyuan Liu, Shortland, AU;
James D. Gillaspie, Yellowknife, AU;
Coralie Adele Lewis, Black Hill, AU;
David Neudorf, Oakville, CA;
Steven Barnett, Hendra, AU;
Houyuan Liu, Shortland, AU;
James D. Gillaspie, Yellowknife, AU;
Coralie Adele Lewis, Black Hill, AU;
David Neudorf, Oakville, CA;
Steven Barnett, Hendra, AU;
QNI Technology Pty. Ltd., Queensland, AU;
Abstract
An atmospheric leach process in the recovery of nickel and cobalt from lateritic ores, said processing including the steps of: a) separating the lateritic ore into a low magnesium containing ore fraction, and a high magnesium containing ore fraction by selective mining or post mining classification; b) separately slurrying the separated ore fractions; c) leaching the low magnesium containing ore fraction with concentrated sulphuric acid as a primary leach step; and d) introducing the high magnesium content ore slurry following substantial completion of the primary leach step and precipitating iron as goethite or another low sulphate containing form of iron oxide or iron hydroxide, wherein sulphuric acid released during iron precipitation is used to leach the high magnesium ore fraction as a secondary leach step.