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Mineralogical characterization and speciation of sulfur, zinc and lead in pyrite cinder from Bergvik, Sweden

Bendz, David and Tiberg, Charlotta and Berggren Kleja, Dan (2021). Mineralogical characterization and speciation of sulfur, zinc and lead in pyrite cinder from Bergvik, Sweden. Applied Geochemistry. 131 , 105010
[Research article]

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Abstract

Roasting of sulfide ores to produce sulfuric acid began on an industrial scale in the middle 1800 ' s and is still used extensively worldwide. The residual, pyrite cinders, have commonly been disposed in the environment where they pose a potential and serious threat to aquatic life. In this project, two profiles in a pyrite cinder deposit in Bergvik, Sweden, have been sampled and a comprehensive mineralogical characterization have been carried out. The objectives were to investigate the composition and morphology of pyrite cinder grains and the speciation of sulfur, Pb and Zn in the solid phase. Scanning electron microscopy showed pyrite cinder grains with a core of the ore minerals pyrite and sphalerite enclosed in layers of iron oxides/hydroxides (mainly hematite). XANES analysis, supported by X-ray diffraction analysis, SEM-EDS and bulk element analysis, showed that content of the residual sulfur in the cinder is mainly sulfides, 55-80%, predominately sphalerite. The remaining mass of sulfur is assumed to be adsorbed or precipitated as secondary sulfate minerals, predominantly associated with the grain surfaces. Calculated saturation indexes indicated barite, anglesite and perhaps aluminite. EXAFS spectroscopy indicated that about half of the Zn was bound to O and half was bound to S. LCF analysis of EXAFS spectra indicated that the main Zn species were sphalerite (40-50%) and franklinite (10-20%). The remaining Zn was associated with iron oxides/hydroxides and Zn minerals like hydrozincite or possibly zinc oxides. SEM-EDS analysis showed Pb precipitate located on both the surface of the grains and in the interior as inclusions. The analytical interpretation indicated anglesite.

Authors/Creators:Bendz, David and Tiberg, Charlotta and Berggren Kleja, Dan
Title:Mineralogical characterization and speciation of sulfur, zinc and lead in pyrite cinder from Bergvik, Sweden
Series Name/Journal:Applied Geochemistry
Year of publishing :2021
Volume:131
Article number:105010
Number of Pages:10
Publisher:PERGAMON-ELSEVIER SCIENCE LTD
ISSN:0883-2927
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Geochemistry
Keywords:Pyrite cinder, Speciation, XAS, Sulfur, Zinc, Lead
URN:NBN:urn:nbn:se:slu:epsilon-p-113313
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-113313
Additional ID:
Type of IDID
DOI10.1016/j.apgeochem.2021.105010
Web of Science (WoS)000684994900001
ID Code:25163
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
Deposited By: SLUpub Connector
Deposited On:02 Sep 2021 13:27
Metadata Last Modified:02 Sep 2021 13:31

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