Legacy base metal slags can generate toxic leachates

Adijat T. Awoniran, Annelly Ketheson, Sandra Piazolo, Damian B. Gore

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    Abstract

    Slags sourced from a derelict zinc–lead–copper–silver–tungsten mine were examined for their bulk elemental composition and mineralogy. pH, oxidation–reduction potential, and the leachability of selected elements (sulphur, calcium, iron, copper, zinc, and lead) were assessed during a 130-day deionised water extraction conducted under oxic conditions. Slags were rich in silicon, iron, copper, zinc, and lead, hosted within minerals including quartz (SiO2), goethite [FeO(OH)], augite [Ca(Mg,AI,Fe)Si2O6], and lead (Pb0). Leachates from the slags increased in analyte concentration throughout the 130-day experiment, with iron, copper, zinc, and lead attaining >5 mg l−1 in some samples. These findings indicate that this pyrometallurgical waste should not be considered environmentally inert, as leachates emanating from them in the field might pose a significant risk to the environment.
    Original languageEnglish
    Pages (from-to)70-77
    Number of pages8
    JournalPowder Diffraction
    Volume32
    Issue numberS2
    DOIs
    Publication statusPublished - Dec 2017

    Bibliographical note

    Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

    Keywords

    • slag
    • derelict mines
    • leachability
    • mineralogy
    • elemental composition

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