The leachability study of iron-oxides from mine tailings in a hybrid of sulfate-chloride lixiviant

Add time:08/14/2019    Source:sciencedirect.com

This experimental study investigates the influence of H+ and Cl− ions on the leaching procedure of the iron ore tailings (IOT) using different lixiviants including various ratios of H2SO4/NaCl, and HCl. By using HYDRA/Spana software, the formed species of iron were identified as FeCl3, Fe(SO4)2− when using 5 M H2SO4/2 M NaCl, and FeCl3, FeCl2+ when utilizing 5 M HCl as leaching lixiviant at 85 °C with significant iron recovery (>85%) within 6 h. However, the combination of 5 M H2SO4/2 M NaCl was more advantageous for the leaching process due mainly to the increased activity of H+, as well as precipitated Ca+2 ions as gypsum. Eventually, for modelling purposes, the iron leaching process was found to fit well with the shrinking core model with surface-chemical-reaction control.

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