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公开(公告)号：EP1851346A1
公开(公告)日：2007-11-07
申请号：EP06704863.7
申请日：2006-02-13
CPC分类号： C22B23/043 , C22B23/0461
摘要： 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.
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