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- W2271979897 abstract "Complex mineralogy and chemistry of low grade nickel (Ni) laterite ores make them unamenable to significant upgrading prior to hydrometallurgical extraction of the value metals. Atmospheric acid leaching (AL) of these ores often faced with challenges such as high reagent consumption, low Ni and pay metal cobalt (Co) extraction rates and mediocre yields. In this study, effect of SO2 addition and slurry solid loading on H2SO4 leaching behaviour and Ni/Co extraction of saprolitic ore was investigated. Isothermal, 4 h batch leaching tests were carried out on 20 and 40 wt. % solid slurries at pH 1 and 95 C in the absence and presence (0.3, 0.6 and 0.9 dm3/min.dm3) of SO2. In all cases, incongruent leaching of value (Ni and Co) and impurity species (e.g., Al, Mg, Fe, Si) with time was observed. Presence of SO2 in leach slurry dramatically decreased its acid consumption (>50%), however, it also significantly reduced the leaching rate of both value and gangue metals. Furthermore, greater acid consumption and Ni/Co extraction rates were observed at lower than higher slurry solid loading confirming the chemical reactions-controlled leach kinetics. The results indicated the key role of H+ concentration and SO2 presence on mechanisms and kinetics of heterogeneous leach reactions." @default.
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- W2271979897 date "2014-01-01" @default.
- W2271979897 modified "2023-09-26" @default.
- W2271979897 title "Atmospheric acid leaching behaviour of saprolitic nickel laterite ore: Effect of sulphur dioxide (SO2) and slurry solid loading" @default.
- W2271979897 hasPublicationYear "2014" @default.
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