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Sorption of nickel ontogoethite (α-FeOOH) and desorption kinetics of aged synthetic Ni-goethite: Implication for Ni laterite ore

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)223-233
Number of pages11
JournalChemical Geology
Volume509
Early online date7 Feb 2019
DOIs
DateSubmitted - 16 Oct 2018
DateAccepted/In press - 16 Jan 2019
DateE-pub ahead of print - 7 Feb 2019
DatePublished (current) - 30 Mar 2019

Abstract

We have measured the sorption of Ni as a function of surface loading and pH with a series of laboratory experiments. We fit the data using a multisite surface complexation model incorporating the basic Stern model to describe the surface electrostatics. At 0.75 wt% Ni and above, however, we cannot model the sorption data in terms of simple surface complexation but must invoke polynuclear complexes (or surface precipitates) to fit the sorption edges. In addition to surface complexation and surface precipitates, Ni is associated with goethite via structural incorporation. After 21 days of sorption, about 90% of the sample with the highest Ni concentration is reversible while 60% of the sample with the lowest concentration (0.03 wt% Ni) is irreversible. In contrast, after 365 days of sorption about 50–60% of the sorbed Ni is irreversible in all the grades (0.003–2.56 wt% Ni) suggesting almost uniform structural incorporation in the lattice of goethite.

    Research areas

  • Desorption, Goethite, Laterite, Nickel, Sorption, Thermodynamic constants

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