Process for enhanced acid leaching of laterite ores

C - Chemistry – Metallurgy – 22 – B

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C22B 3/08 (2006.01) C22B 3/10 (2006.01) C22B 23/00 (2006.01)

Patent

CA 2597440

A process for the recovery of nickel and cobalt from a nickeliferous laterite ore including the steps of : a) providing a nickeliferous laterite ore and separating that ore into its low magnesium limonite fraction and high magnesium saprolite fraction; b) treating the limonite fraction in acid solution in a primary high pressure leach step to produce a primary leach slurry; c) 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.

L'invention concerne un processus de récupération de nickel et de cobalt à partir d'une latérite nickélifère. Ledit processus consiste à (a) fournir un minerai de latérite nickélifère et séparer ce minerai en une fraction de limonite à faible teneur en magnésium et en une fraction de saprolite à teneur élevée en magnésium, (b) traiter ladite fraction de limonite dans une solution acide lors d'une étape primaire de lixiviation de pression élevée afin de produire une suspension de lixiviation primaire, (c) ajouter la fraction de saprolite à la suspension de lixiviation primaire de façon à entamer la précipitation de fer en tant que goethite et/ hématite, tandis que de l'acide est libéré simultanément de la précipitation de fer, en vue d'effectuer une étape secondaire de lixiviation à pression atmosphérique, ce qui produit une suspension de lixiviation secondaire, toute l'eau utilisée dans la préparation de suspensions de minerais et/ou de solutions acides renfermant une composition ionique qui permet d'éviter sensiblement la formation de jarosite.

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