Characterization of Weda Bay nickel laterite ore from Indonesia
| Autor: | Saeed Farrokhpay, Odile Laugier, Simon B. Blancher, Michel Cathelineau, Lev Filippov |
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| Přispěvatelé: | GeoRessources, Centre National de la Recherche Scientifique (CNRS)-Université de Lorraine (UL)-Centre de recherches sur la géologie des matières premières minérales et énergétiques (CREGU)-Institut national des sciences de l'Univers (INSU - CNRS), ERAMET RESEARCH SLN, 1 Avenue Albert Einstein, 78190 Trappes, France, ERAMET et LabEx RESSOURCES21, ANR-10-LABX-0021,RESSOURCES21,Strategic metal resources of the 21st century(2010) |
| Rok vydání: | 2019 |
| Předmět: |
Saprolite
Materials science [SDU.STU]Sciences of the Universe [physics]/Earth Sciences chemistry.chemical_element 010501 environmental sciences engineering.material 010502 geochemistry & geophysics 01 natural sciences chemistry.chemical_compound Geochemistry and Petrology Laterite Weda Bay Quartz 0105 earth and related environmental sciences Magnetite Limonite Mineral Serpentine Metallurgy Nontronite QEMSCAN mapping Nickel chemistry [SDU]Sciences of the Universe [physics] visual_art Raman spectroscopy engineering visual_art.visual_art_medium Economic Geology Nickel laterite |
| Zdroj: | Journal of Geochemical Exploration Journal of Geochemical Exploration, Elsevier, 2019, 196, pp.270-281. ⟨10.1016/j.gexplo.2018.11.002⟩ |
| ISSN: | 0375-6742 |
| DOI: | 10.1016/j.gexplo.2018.11.002 |
| Popis: | The association of fine grained Mg Ni silicates with oxy-hydroxides in laterites and saprolites represents challenges for ore processing, in particular, in nickel enrichment. The Weda Bay nickel deposit in Indonesia is a typical example of these complex ores, where clays such as nontronites develop on polyphase serpentinite as protolith. Thus, ores at Weda Bay have a very fine textured and complex mineralogy, which requires a comprehensive mineralogical identification through the use of a series of different types of analytical approaches (i.e. macroscopic and microscopic methods including SEM equipped with energy dispersive X-ray spectrometry (EDS), Raman spectroscopy, Infrared and X-ray fluorescence spectroscopy, and QEMSCAN® mapping). Nickel rich saprolites were found to be principally composed of several types of Mg Ni serpentines, quartz, clays (nontronite in particular) and little amounts of iron hydroxides. Besides, some parts of the deposit were characterized by the development of nontronites at the interface between the saprolite and the limonite zone. Above this zone, the limonite zone is dominated by iron hydroxides as expected, which replace all earlier silicates including serpentine, and contains a significant amount of nickel. The representative composite ore sample contains several nickel bearers with variable nickel grade of 2 to 3%. Exceptionally richer phases such as polygonal Fe (Ni)-rich serpentine were also found with nickel grade of 5 to 10%. Serpentine types as well as other newly formed silicates such as Fe-Mg-(Ni) smectites, are intimately mixed, preventing any mineral separation. Therefore, the only phases which can be separated are quartz and magnetite. This complicates the upgrading of nickel in Weda Bay laterite ore. |
| Databáze: | OpenAIRE |
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