Acid resistance of goethite in nickel laterite ore from Western Australia. Part I: The relationship between goethite morphologies and acid leaching performance
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Nickel containing goethite in laterite ores shows extreme variability in heap leaching performance. This has been difficult to characterise making utilisation of these ores for heap leaching problematic. The variability of the leaching performance is demonstrated for selected samples using atmospheric pressure leaching. Quantitative mineralogical analysis based on X-ray diffraction, crystallite morphology from transmission electron microscopy imaging and the chemical composition measured by energy dispersive X-ray spectrometry of the pre- and post-leached laterite ore samples suggests acid resistant (slow leaching) goethite is paragenetically interlaced with silica or kaolinite. Caustic digestion is shown to be effective in breaking up cementation frameworks and liberating the goethite interlaced by silica or kaolinite. Large single domain goethite and high chromium substituted goethite are also identified in the slow leaching samples. A better understanding of the microstructure of the acid resistant laterite ores is expected to lead to improvement in the hydrometallurgical processing for these ores.
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X-ray diffraction line profile analysis of acid-resistant goethite in Western Australian nickel laterite oreWang, X.; Li, J.; McDonald, R.; Van Riessen, Arie; Hart, R. (2015)The goethite peaks in synchrotron and laboratory X-ray powder diffraction (XRPD) patterns of an acid-resistant nickel laterite ore sample from a site in Western Australia exhibit a 'super-Lorentzian' shape. The method for ...
Acid resistance of goethite in nickel laterite ore from Western Australia. Part II. Effect of liberating cementations on acid leaching performanceWang, Xiaodong; McDonald, R.; Hart, Robert; Li, J.; van Riessen, Arie (2014)The acid resistance of some West Australian laterite ores has been reported to be associated with its cementation structure at submicron level. Although closely related, iron and silicon are found not to be intimately ...
Wang, Kai (2012)Atmospheric leaching (AL) of low-grade nickel laterite ores can produce a pregnant leach solution (PLS) containing significant amounts of impurities such as trivalent iron, aluminium and chromium ions. Purification of PLS ...