Particulates in hydrometallurgy: Part I. Characterization of laterite acid leach residues

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Two different laterite samples were leached with sulfuric acid in the 25-275°C temperature range in order to evaluate the effects of ore type and leaching conditions on the settling behavior of the leach residues. The initial solids, as well as the leach residues, were characterized by X-ray diffraction, electrophoretic mobility, particle size analyses, and chemical analyses. From the results, Ore No. 1 was found to be a limonitic-type material, whereas Ore No. 2 a transitional laterite ore. The conversion of goethite to hematite was enhanced as the temperature and/or leaching time was increased. Moreover, as the leaching temperature increased, the concentrations of Ni and Co progressively increased in solution, whereas the impurities rose through a maximum and then decreased. Particle size growth increased with temperature increase. Electrophoretic mobility shifted to less acidic values.

Original languageEnglish (US)
Pages (from-to)1123-1131
Number of pages9
JournalMetallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
Issue number6
StatePublished - Dec 1 1995

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry


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