Legacy base metal slags can generate toxic leachates

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

doi:10.1017/S0885715617000999

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 language	English
Pages (from-to)	70-77
Number of pages	8
Journal	Powder Diffraction
Volume	32
Issue number	S2
DOIs	https://doi.org/10.1017/S0885715617000999
Publication status	Published - 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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10.1017/S0885715617000999

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Awoniran, A. T., Ketheson, A., Piazolo, S., & Gore, D. B. (2017). Legacy base metal slags can generate toxic leachates. Powder Diffraction, 32(S2), 70-77. https://doi.org/10.1017/S0885715617000999

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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.",

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AU - Piazolo, Sandra

AU - Gore, Damian B.

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AB - 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.

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